Swan Canning catchment data report January – December 2018
Looking after all our water needs
Department of Water and Environmental Regulation Technical Report prepared for the Department of Biodiversity, Conservation and Attractions (Rivers and Estuaries Branch).
June 2019 Department of Water and Environmental Regulation Prime House, Davidson Terrace, Joondalup, Western Australia 6027 Telephone +61 8 6364 7000 Facsimile +61 8 6364 7001 www.dwer.wa.gov.au © Government of Western Australia 2019 June 2019 This work is copyright. You may download, display, print and reproduce this material in unaltered form only (retaining this notice) for your personal, non- commercial use or use within your organisation. Apart from any use as permitted under the Copyright Act 1968, all other rights are reserved. Requests and inquiries concerning reproduction and rights should be addressed to the Department of Water and Environmental Regulation.
Acknowledgements This project was funded by the Government of Western Australia through the Department of Biodiversity, Conservation and Attractions (Rivers and Estuaries Branch) and the Department of Water and Environmental Regulation.
For more information about this report, contact:
Dominic Heald (Environmental Officer), Aquatic Science Branch.
ii Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Contents Preface ...... 25 Summary ...... 31 1 Avon River (SWN5) ...... 32 2 Bannister Creek (SWS2) ...... 40 3 Bayswater Main Drain (SWS10) ...... 48 4 Bennett Brook (SWN12) ...... 55 5 Bickley Brook (SWS4) ...... 63 6 Blackadder Creek (SWN8) ...... 70 7 Bull Creek (SCCIS2) ...... 77 8 Bull Creek (BAMDKD) ...... 84 9 Canning River (SWS12) ...... 91 10 Claise Brook (CB13) ...... 99 11 Ellen Brook (SWN3) ...... 106 12 Ellen Brook (West Swan Rd – SWN9) ...... 114 13 Ellis Brook (EBGS01) ...... 121 14 Helena River (SWN10) ...... 128 15 Helm Street Main Drain (SCCIS4) ...... 135 16 Henley Brook (HBBROCK)...... 142 17 Jane Brook (SWN7) ...... 149 18 Lower Canning (SCCIS3) ...... 156 19 Maylands-Inglewood MD (MIMDOUT) ...... 163 20 Mills Street Main Drain (SWS1) ...... 170 21 Perth Airport North (SCCIS12) ...... 178 22 Perth Airport South (KANAV) ...... 185 23 St Leonard’s Creek (SCCIN3) ...... 192 24 South Belmont Main Drain (SWS13) ...... 199 25 South Perth (SCCIS1) ...... 207 26 South Perth (WIFRD) ...... 214 27 Southern River (SWS7) ...... 221 28 Neerigen Brook (AW05) ...... 229 29 Susannah Brook (SWN11) ...... 236 30 Upper Swan (CSMDREID) ...... 244 31 Upper Swan (WNDCK) ...... 251
Department of Water and Environmental Regulation 3 Swan Canning Catchment Data Report January - December 2018
32 Yule Brook (SWS3) ...... 258 33 SWANCATCH/SCWQIP data comparison ...... 265 34 Perth rainfall ...... 267
4 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Tables Table 1 SWANCATCH Swan and Canning catchment site coordinates...... 27 Table 2 SCWQIP Swan and Canning catchment site coordinates...... 28 Table 3 Swan and Canning catchment sampling regime...... 30 Table 4 2018 monthly sample numbers, minimum and maximum values at site SWN5 (Avon R)...... 38 Table 5 2018 monthly sample numbers, minimum and maximum values at SWS2 (Bannister Ck)...... 46 Table 6 2018 monthly sample numbers, minimum and maximum values at SWS10 (Bayswater MD)...... 53 Table 7 2018 monthly sample numbers, minimum and maximum values at SWN12 (Bennett Bk)...... 61 Table 8 2018 monthly sample numbers, minimum and maximum values at SWS4 (Bickley Bk)...... 68 Table 9 2018 monthly sample numbers, minimum and maximum values at SWN8 (Blackadder Ck)...... 75 Table 10 2018 monthly sample numbers, minimum and maximum values at SCCIS2 (Bull Ck)...... 82 Table 11 2018 monthly sample numbers, minimum and maximum values at BAMDKD (Bull Ck)...... 89 Table 12 2018 monthly sample numbers, minimum and maximum values at SWS12 (Canning R)...... 97 Table 13 2018 monthly sample numbers, minimum and maximum values at CB13 (Claise Bk)...... 104 Table 14 2018 monthly sample numbers, minimum and maximum values at SWN3 (Ellen Bk)...... 112 Table 15 2018 monthly sample numbers, minimum and maximum values at SWN9 (Ellen Bk -WSRd)...... 119 Table 16 2018 monthly sample numbers, minimum and maximum values at EBGS01 (Ellis Bk)...... 126 Table 17 2018 monthly sample numbers, minimum and maximum values at SWN10 (Helena R)...... 133 Table 18 2018 monthly sample numbers, minimum and maximum values at SCCIS4 (Helm St)...... 140 Table 19 2018 monthly sample numbers, minimum and maximum values at HBBROCK (Henley Bk)...... 147 Table 20 2018 monthly sample numbers, minimum and maximum values at SWN7 (Jane Bk)...... 154 Table 21 2018 monthly sample numbers, minimum and maximum values at SCCIS3 (Lower Canning)...... 161 Table 22 2018 monthly sample numbers, minimum and maximum values at MIMDOUT (Maylands MD)...... 168 Table 23 2018 monthly sample numbers, minimum and maximum values at SWS1 (Mills St MD)...... 176 Table 24 2018 monthly sample numbers, minimum and maximum values at SCCIS12 (Perth Airport North)...... 183 Table 25 2018 monthly sample numbers, minimum and maximum values at KANAV (Perth Airport South)...... 190 Table 26 2018 monthly sample numbers, minimum and maximum values at SCCIN3 (St Leonard’s Ck)...... 197 Table 27 2018 monthly sample numbers, minimum and maximum values at SWS13 (S. Belmont MD)...... 205
Department of Water and Environmental Regulation 5 Swan Canning Catchment Data Report January - December 2018
Table 28 2018 monthly sample numbers, minimum and maximum values at SCCIS1 (S. Perth)...... 212 Table 29 2018 monthly sample numbers, minimum and maximum values at WIFRD (S. Perth)...... 219 Table 30 2018 monthly sample numbers, minimum and maximum values at SWS7 (Southern R)...... 227 Table 31 2018 monthly sample numbers, minimum and maximum values at AW05 (Neerigen Bk)...... 234 Table 32 2018 monthly sample numbers, minimum and maximum values at SWN11 (Susannah Bk)...... 242 Table 33 2018 monthly sample numbers, minimum and maximum values at CSMDREID (Upper Swan)...... 249 Table 34 2018 monthly sample numbers, minimum and maximum values at WNDCK (Upper Swan)...... 256 Table 35 2018 monthly sample numbers, minimum and maximum values at SWS3 (Yule Bk)...... 263 Table 36 2018 (January - December) mean ± standard deviation for all SWANCATCH (bold font) and SCWQIP (regular font) sites...... 265
6 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Figures Figure 1 Map of Swan and Canning catchment routine monitoring sites...... 29 Figure 2 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R)...... 32 + -1 Figure 3 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R)...... 32 Figure 4 2018 Total Oxidised Nitrogen (NOx-N) (mg.L -1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R)...... 33 Figure 5 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R)...... 33 Figure 6 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R)...... 34 Figure 7 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R)...... 34 Figure 8 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R)...... 35 Figure 9 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R)...... 35 Figure 10 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R)...... 36 Figure 11 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R)...... 36 Figure 12 2018 Avon R flow at Walyunga (616011) – Daily discharge hydrograph measured in megalitres...... 37 Figure 13 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS2 (Bannister Ck)...... 40 + -1 Figure 14 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS2 (Bannister Ck)...... 40 Figure 15 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS2 (Bannister Ck)...... 41 Figure 16 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS2 (Bannister Ck)...... 41 Figure 17 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS2 (Bannister Ck)...... 42 Figure 18 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS2 (Bannister Ck)...... 42 Figure 19 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS2 (Bannister Ck)...... 43
Department of Water and Environmental Regulation 7 Swan Canning Catchment Data Report January - December 2018
Figure 20 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS2 (Bannister Ck)...... 43 Figure 21 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS2 (Bannister Ck)...... 44 Figure 22 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS2 (Bannister Ck)...... 44 Figure 23 2018 Bannister Creek flow at Acacia Place (616134) – Daily discharge hydrograph measured in megalitres...... 45 Figure 24 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS10 (Bayswater MD)...... 48 + -1 Figure 25 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS10 (Bayswater MD)...... 48 Figure 26 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS10 (Bayswater MD)...... 49 Figure 27 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS10 (Bayswater MD)...... 49 Figure 28 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS10 (Bayswater MD)...... 50 Figure 29 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS10 (Bayswater MD)...... 50 Figure 30 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS10 (Bayswater MD)...... 51 Figure 31 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS10 (Bayswater MD)...... 51 Figure 32 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS10 (Bayswater MD)...... 52 Figure 33 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS10 (Bayswater MD)...... 52 Figure 34 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN12 (Bennett Bk)...... 55 + -1 Figure 35 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN12 (Bennett Bk)...... 55 Figure 36 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN12 (Bennett Bk)...... 56 Figure 37 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN12 (Bennett Bk)...... 56 Figure 38 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN12 (Bennett Bk)...... 57
8 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Figure 39 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN12 (Bennett Bk)...... 57 Figure 40 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN12 (Bennett Bk)...... 58 Figure 41 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN12 (Bennett Bk)...... 58 Figure 42 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN12 (Bennett Bk)...... 59 Figure 43 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN12 (Bennett Bk)...... 59 Figure 44 2018 Bennett Bk flow (616084) – Daily discharge hydrograph measured in megalitres...... 60 Figure 45 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS4 (Bickley Bk). 63 + -1 Figure 46 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS4 (Bickley Bk)...... 63 Figure 47 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS4 (Bickley Bk)...... 64 Figure 48 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS4 (Bickley Bk)...... 64 Figure 49 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS4 (Bickley Bk)...... 65 Figure 50 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS4 (Bickley Bk)...... 65 Figure 51 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS4 (Bickley Bk)...... 66 Figure 52 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS4 (Bickley Bk)...... 66 Figure 53 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS4 (Bickley Bk)...... 67 Figure 54 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS4 (Bickley Bk)...... 67 Figure 55 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN8 (Blackadder Ck)...... 70 + -1 Figure 56 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN8 (Blackadder Ck)...... 70 Figure 57 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN8 (Blackadder Ck)...... 71
Department of Water and Environmental Regulation 9 Swan Canning Catchment Data Report January - December 2018
Figure 58 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN8 (Blackadder Ck)...... 71 Figure 59 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN8 (Blackadder Ck)...... 72 Figure 60 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN8 (Blackadder Ck)...... 72 Figure 61 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN8 (Blackadder Ck)...... 73 Figure 62 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN8 (Blackadder Ck)...... 73 Figure 63 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN8 (Blackadder Ck)...... 74 Figure 64 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN8 (Blackadder Ck)...... 74 Figure 65 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS2 (Bull Ck). ... 77 + -1 Figure 66 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS2 (Bull Ck)...... 77 Figure 67 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS2 (Bull Ck)...... 78 Figure 68 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS2 (Bull Ck)...... 78 Figure 69 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS2 (Bull Ck)...... 79 Figure 70 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS2 (Bull Ck)...... 79 Figure 71 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS2 (Bull Ck)...... 80 Figure 72 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS2 (Bull Ck)...... 80 Figure 73 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS2 (Bull Ck)...... 81 Figure 74 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS2 (Bull Ck)...... 81 Figure 75 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site BAMDKD (Bull Ck). 84 + -1 Figure 76 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site BAMDKD (Bull Ck)...... 84
10 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Figure 77 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at BAMDKD (Bull Ck)...... 85 Figure 78 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at BAMDKD (Bull Ck)...... 85 Figure 79 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site BAMDKD (Bull Ck)...... 86 Figure 80 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at BAMDKD (Bull Ck)...... 86 Figure 81 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at BAMDKD (Bull Ck)...... 87 Figure 82 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site BAMDKD (Bull Ck)...... 87 Figure 83 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site BAMDKD (Bull Ck)...... 88 Figure 84 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site BAMDKD (Bull Ck)...... 88 Figure 85 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS12 (Canning R)...... 91 + -1 Figure 86 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS12 (Canning R)...... 91 Figure 87 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS12 (Canning R)...... 92 Figure 88 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS12 (Canning R)...... 92 Figure 89 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS12 (Canning R)...... 93 Figure 90 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS12 (Canning R)...... 93 Figure 91 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS12 (Canning R)...... 94 Figure 92 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS12 (Canning R)...... 94 Figure 93 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS12 (Canning)...... 95 Figure 94 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS12 (Canning R)...... 95 Figure 95 2018 Canning River flow (616027) – Daily discharge hydrograph measured in megalitres...... 96
Department of Water and Environmental Regulation 11 Swan Canning Catchment Data Report January - December 2018
Figure 96 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CB13 (Claise Bk). ... 99 + -1 Figure 97 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CB13 (Claise Bk)...... 99 Figure 98 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CB13 (Claise Bk)...... 100 Figure 99 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CB13 (Claise Bk)...... 100 Figure 100 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CB13 (Claise Bk)...... 101 Figure 101 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CB13 (Claise Bk)...... 101 Figure 102 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CB13 (Claise Bk)...... 102 Figure 103 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CB13 (Claise Bk)...... 102 Figure 104 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CB13 (Claise Bk)...... 103 Figure 105 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CB13 (Claise Bk)...... 103 Figure 106 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN3 (Ellen Bk). .. 106 + -1 Figure 107 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN3 (Ellen Bk)...... 106 Figure 108 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN3 (Ellen Bk)...... 107 Figure 109 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN3 (Ellen Bk)...... 107 Figure 110 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN3 (Ellen Bk)...... 108 Figure 111 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN3 (Ellen Bk)...... 108 Figure 112 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN3 (Ellen Bk)...... 109 Figure 113 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN3 (Ellen Bk)...... 109 Figure 114 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN3 (Ellen Bk)...... 110
12 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Figure 115 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN3 (Ellen Bk)...... 110 Figure 116 2018 Ellen Bk flow (616189) – Daily discharge hydrograph measured in megalitres...... 111 Figure 117 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN9 (Ellen Bk - WSRd)...... 114 + -1 Figure 118 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN9 (Ellen Bk -WSRd)...... 114 Figure 119 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN9 (Ellen Bk -WSRd)...... 115 Figure 120 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN9 (Ellen Bk -WSRd)...... 115 Figure 121 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN9 (Ellen Bk - WSRd)...... 116 Figure 122 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN9 (Ellen Bk -WSRd)...... 116 Figure 123 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN9 (Ellen Bk -WSRd)...... 117 Figure 124 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN9 (Ellen Bk -WSRd)...... 117 Figure 125 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN9 (Ellen Bk - WSRd)...... 118 Figure 126 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN9 (Ellen Bk - WSRd)...... 118 Figure 127 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site EBGS01 (Ellis Bk). 121 + -1 Figure 128 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site EBGS01 (Ellis Bk)...... 121 Figure 129 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at EBGS01 (Ellis Bk)...... 122 Figure 130 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at EBGS01 (Ellis Bk)...... 122 Figure 131 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site EBGS01 (Ellis Bk)...... 123 Figure 132 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at EBGS01 (Ellis Bk)...... 123 Figure 133 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at EBGS01 (Ellis Bk)...... 124
Department of Water and Environmental Regulation 13 Swan Canning Catchment Data Report January - December 2018
Figure 134 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site EBGS01 (Ellis Bk)...... 124 Figure 135 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site EBGS01 (Ellis Bk)...... 125 Figure 136 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site EBGS01 (Ellis Bk)...... 125 Figure 137 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN10 (Helena R)...... 128 + -1 Figure 138 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN10 (Helena R)...... 128 Figure 139 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN10 (Helena R)...... 129 Figure 140 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN10 (Helena R)...... 129 Figure 141 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN10 (Helena R)...... 130 Figure 142 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN10 (Helena R)...... 130 Figure 143 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN10 (Helena R)...... 131 Figure 144 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN10 (Helena R)...... 131 Figure 145 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN10 (Helena R)...... 132 Figure 146 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN10 (Helena R)...... 132 Figure 147 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS4 (Helm St). 135 + -1 Figure 148 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS4 (Helm St)...... 135 Figure 149 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS4 (Helm St)...... 136 Figure 150 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS4 (Helm St)...... 136 Figure 151 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS4 (Helm St)...... 137 Figure 152 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS4 (Helm St)...... 137
14 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Figure 153 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS4 (Helm St)...... 138 Figure 154 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS4 (Helm St)...... 138 Figure 155 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS4 (Helm St)...... 139 Figure 156 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS4 (Helm St)...... 139 Figure 157 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site HBBROCK (Henley Bk)...... 142 + -1 Figure 158 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site HBBROCK (Henley Bk)...... 142 Figure 159 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at HBBROCK (Henley Bk)...... 143 Figure 160 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at HBBROCK (Henley Bk)...... 143 Figure 161 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site HBBROCK (Henley Bk)...... 144 Figure 162 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site HBBROCK (Henley Bk)...... 144 Figure 163 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at HBBROCK (Henley Bk)...... 145 Figure 164 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site HBBROCK (Henley Bk)...... 145 Figure 165 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site HBBROCK (Henley Bk)...... 146 Figure 166 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site HBBROCK (Henley Bk)...... 146 Figure 167 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN7 (Jane Bk). .. 149 + -1 Figure 168 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN7 (Jane Bk)...... 149 Figure 169 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN7 (Jane Bk)...... 150 Figure 170 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN7 (Jane Bk)...... 150 Figure 171 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN7 (Jane Bk)...... 151
Department of Water and Environmental Regulation 15 Swan Canning Catchment Data Report January - December 2018
Figure 172 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN7 (Jane Bk)...... 151 Figure 173 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN7 (Jane Bk)...... 152 Figure 174 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN7 (Jane Bk)...... 152 Figure 175 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN7 (Jane Bk)...... 153 Figure 176 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN7 (Jane Bk)...... 153 Figure 177 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS3 (Lower Canning)...... 156 + -1 Figure 178 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS3 (Lower Canning)...... 156 Figure 179 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS3 (Lower Canning)...... 157 Figure 180 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS3 (Lower Canning)...... 157 Figure 181 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS3 (Lower Canning)...... 158 Figure 182 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS3 (Lower Canning)...... 158 Figure 183 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS3 (Lower Canning)...... 159 Figure 184 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS3 (Lower Canning)...... 159 Figure 185 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS3 (Lower Canning)...... 160 Figure 186 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS3 (Lower Canning)...... 160 Figure 187 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site MIMDOUT (Maylands MD)...... 163 + -1 Figure 188 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site MIMDOUT (Maylands MD)...... 163 Figure 189 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at MIMDOUT (Maylands MD)...... 164
16 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Figure 190 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at MIMDOUT (Maylands MD)...... 164 Figure 191 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site MIMDOUT (Maylands MD)...... 165 Figure 192 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at MIMDOUT (Maylands MD)...... 165 Figure 193 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at MIMDOUT (Maylands MD)...... 166 Figure 194 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site MIMDOUT (Maylands MD)...... 166 Figure 195 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site MIMDOUT (Maylands MD)...... 167 Figure 196 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site MIMDOUT (Maylands MD)...... 167 Figure 197 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS1 (Mills St MD)...... 170 + -1 Figure 198 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS1 (Mills St MD)...... 170 Figure 199 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS1 (Mills St MD)...... 171 Figure 200 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS1 (Mills St MD)...... 171 Figure 201 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS1 (Mills St MD)...... 172 Figure 202 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS1 (Mills St MD)...... 172 Figure 203 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS1 (Mills St MD)...... 173 Figure 204 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS1 (Mills St MD)...... 173 Figure 205 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS1 (Mills St MD)...... 174 Figure 206 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS1 (Mills St MD)...... 174 Figure 207 2018 Mills St MD flow (616043) – Daily discharge hydrograph measured in megalitres ...... 175 Figure 208 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS12 (Perth Airport North)...... 178
Department of Water and Environmental Regulation 17 Swan Canning Catchment Data Report January - December 2018
+ -1 Figure 209 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS12 (Perth Airport North)...... 178 Figure 210 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS12 (Perth Airport North)...... 179 Figure 211 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS12 (Perth Airport North)...... 179 Figure 212 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS12 (Perth Airport North)...... 180 Figure 213 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS12 (Perth Airport North)...... 180 Figure 214 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS12 (Perth Airport North)...... 181 Figure 215 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS12 (Perth Airport North)...... 181 Figure 216 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS12 (Perth Airport North)...... 182 Figure 217 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS12 (Perth Airport North)...... 182 Figure 218 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site KANAV (Perth Airport South)...... 185 + -1 Figure 219 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site KANAV (Perth Airport South)...... 185 Figure 220 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at KANAV (Perth Airport South)...... 186 Figure 221 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at KANAV (Perth Airport South)...... 186 Figure 222 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site KANAV (Perth Airport South)...... 187 Figure 223 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at KANAV (Perth Airport South)...... 187 Figure 224 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at KANAV (Perth Airport South)...... 188 Figure 225 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site KANAV (Perth Airport South)...... 188 Figure 226 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site KANAV (Perth Airport South)...... 189
18 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Figure 227 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site KANAV (Perth Airport South)...... 189 Figure 228 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIN3 (St Leonard’s Ck)...... 192 + -1 Figure 229 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIN3 (St Leonard’s Ck)...... 192 Figure 230 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIN3 (St Leonard’s Ck)...... 193 Figure 231 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIN3 (St Leonard’s Ck)...... 193 Figure 232 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIN3 (St Leonard’s Ck)...... 194 Figure 233 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIN3 (St Leonard’s Ck)...... 194 Figure 234 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIN3 (St Leonard’s Ck)...... 195 Figure 235 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIN3 (St Leonard’s Ck)...... 195 Figure 236 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIN3 (St Leonard’s Ck)...... 196 Figure 237 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIN3 (St Leonard’s Ck)...... 196 Figure 238 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS13 (S. Belmont MD)...... 199 + -1 Figure 239 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS13 (S. Belmont MD)...... 199 Figure 240 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS13 (S. Belmont MD)...... 200 Figure 241 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS13 (S. Belmont MD)...... 200 Figure 242 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS13 (S. Belmont MD)...... 201 Figure 243 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS13 (S. Belmont MD)...... 201 Figure 244 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS13 (S. Belmont MD)...... 202
Department of Water and Environmental Regulation 19 Swan Canning Catchment Data Report January - December 2018
Figure 245 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS13 (S. Belmont MD)...... 202 Figure 246 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS13 (S. Belmont MD)...... 203 Figure 247 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS13 (S. Belmont MD)...... 203 Figure 248 2018 S. Belmont MD flow at Cleaver Terrace (6160133) – Daily discharge hydrograph measured in megalitres...... 204 Figure 249 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS1 (S. Perth). 207 + -1 Figure 250 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS1 (S. Perth)...... 207 Figure 251 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS1 (S. Perth)...... 208 Figure 252 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS1 (S. Perth)...... 208 Figure 253 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS1 (S. Perth)...... 209 Figure 254 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS1 (S. Perth)...... 209 Figure 255 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS1 (S. Perth)...... 210 Figure 256 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS1 (S. Perth)...... 210 Figure 257 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS1 (S. Perth)...... 211 Figure 258 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS1 (S. Perth)...... 211 Figure 259 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WIFRD (S. Perth). 214 + -1 Figure 260 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WIFRD (S. Perth)...... 214 Figure 261 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WIFRD (S. Perth)...... 215 Figure 262 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WIFRD (S. Perth)...... 215 Figure 263 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WIFRD (S. Perth)...... 216
20 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Figure 264 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WIFRD (S. Perth)...... 216 Figure 265 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WIFRD (S. Perth)...... 217 Figure 266 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WIFRD (S. Perth)...... 217 Figure 267 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WIFRD (S. Perth)...... 218 Figure 268 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WIFRD (S. Perth)...... 218 Figure 269 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS7 (Southern R)...... 221 + -1 Figure 270 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS7 (Southern R)...... 221 Figure 271 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS7 (Southern R)...... 222 Figure 272 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS7 (Southern R)...... 222 Figure 273 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS7 (Southern R)...... 223 Figure 274 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS7 (Southern R)...... 223 Figure 275 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS7 (Southern R)...... 224 Figure 276 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS7 (Southern R)...... 224 Figure 277 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS7 (Southern R)...... 225 Figure 278 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS7 (Southern R)...... 225 Figure 279 2018 Southern River (616092) flow – Daily discharge hydrograph measured in megalitres...... 226 Figure 280 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site AW05 (Neerigen Bk)...... 229 + -1 Figure 281 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site AW05 (Neerigen Bk)...... 229 Figure 282 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at AW05 (Neerigen Bk)...... 230
Department of Water and Environmental Regulation 21 Swan Canning Catchment Data Report January - December 2018
Figure 283 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at AW05 (Neerigen Bk)...... 230 Figure 284 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site AW05 (Neerigen Bk)...... 231 Figure 285 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at AW05 (Neerigen Bk)...... 231 Figure 286 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at AW05 (Neerigen Bk)...... 232 Figure 287 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site AW05 (Neerigen Bk)...... 232 Figure 288 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site AW05 (Neerigen Bk)...... 233 Figure 289 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site AW05 (Neerigen Bk)...... 233 Figure 290 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN11 (Susannah Bk)...... 236 + -1 Figure 291 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN11 (Susannah Bk)...... 236 Figure 292 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN11 (Susannah Bk)...... 237 Figure 293 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN11 (Susannah Bk)...... 237 Figure 294 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN11 (Susannah Bk)...... 238 Figure 295 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN11 (Susannah Bk)...... 238 Figure 296 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN11 (Susannah Bk)...... 239 Figure 297 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN11 (Susannah Bk)...... 239 Figure 298 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN11 (Susannah Bk)...... 240 Figure 299 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN11 (Susannah Bk)...... 240 Figure 300 2018 Susannah Bk flow (616099) – Daily discharge hydrograph measured in megalitres...... 241 Figure 301 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CSMDREID (Upper Swan)...... 244
22 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
+ -1 Figure 302 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CSMDREID (Upper Swan)...... 244 Figure 303 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CSMDREID (Upper Swan)...... 245 Figure 304 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CSMDREID (Upper Swan)...... 245 Figure 305 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CSMDREID (Upper Swan)...... 246 Figure 306 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CSMDREID (Upper Swan)...... 246 Figure 307 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CSMDREID (Upper Swan)...... 247 Figure 308 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CSMDREID (Upper Swan)...... 247 Figure 309 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CSMDREID (Upper Swan)...... 248 Figure 310 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CSMDREID (Upper Swan)...... 248 Figure 311 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WNDCK (Upper Swan)...... 251 + -1 Figure 312 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WNDCK (Upper Swan)...... 251 Figure 313 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WNDCK (Upper Swan)...... 252 Figure 314 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WNDCK (Upper Swan)...... 252 Figure 315 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WNDCK (Upper Swan)...... 253 Figure 316 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WNDCK (Upper Swan)...... 253 Figure 317 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WNDCK (Upper Swan)...... 254 Figure 318 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WNDCK (Upper Swan)...... 254 Figure 319 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WNDCK (Upper Swan)...... 255
Department of Water and Environmental Regulation 23 Swan Canning Catchment Data Report January - December 2018
Figure 320 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WNDCK (Upper Swan)...... 255 Figure 321 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS3 (Yule Bk). ... 258 + -1 Figure 322 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS3 (Yule Bk)...... 258 Figure 323 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS3 (Yule Bk)...... 259 Figure 324 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS3 (Yule Bk)...... 259 Figure 325 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS3 (Yule Bk)...... 260 Figure 326 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS3 (Yule Bk)...... 260 Figure 327 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS3 (Yule Bk)...... 261 Figure 328 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS3 (Yule Bk)...... 261 Figure 329 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS3 (Yule Bk)...... 262 Figure 330 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS3 (Yule Bk)...... 262 Figure 331 Perth’s rainfall 1st January 2013 to 31st December 2018...... 267
24 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Preface The Swan Canning Environmental Monitoring and Reporting project is a long-term monitoring project consisting of regular sampling of the Swan and Canning Rivers and selected tributaries within their catchments, enabling regular water quality reporting and annual reporting on estuarine and catchment compliance against long and short term targets. The project was initially designed and implemented in 1994 by the Swan River Trust and Department of Water and Environmental Regulation (then Water and Rivers Commission). The project currently falls under the Department of Biodiversity, Conservation and Attractions’ River Protection Strategy and is jointly operated by the Aquatic Science Branch of the Department of Water and Environmental Regulation and the Department of Biodiversity, Conservation and Attractions. The sampling conducted for this project is captured under the Department of Water and Environmental Regulation WIN data management project SG-C-SWANCATCH, consisting of fortnightly sampling of sixteen sites. In March 2010 a second catchment sampling project was implemented to address gaps in previous monitoring and to provide data for predictive modelling of the Swan Canning Catchment. This project consists of fortnightly sampling of seventeen sites and falls under the Department of Water and Environmental Regulation project SG- C-SCWQIP (Swan Canning Water Quality Improvement Plan). Note that this sampling project was initially run from January 2007 to June 2008 as SG-C- SWANCCI but was closed due to limited funding. Some important changes to the SWANCATCH and SCWQIP projects are listed below: From September 2016 a new site was added to the SCWQIP project on Mount’s Bay Main Drain at the Perth Convention Centre car park (CCDRMBRD). In August 2016 sampling of the Perth Airport South drain was switched from SCCIS11 to KANAV, after a period of sampling both sites (from June 2016), due to piping of the drain at the original site (SCCIS11). From April 2012 onwards the SCWQIP sites list was modified and now consists of 16 sites (down from 17); four of which are new sites selected after a period of expanded monitoring where 36 sites were monitored for nine months (Aug 2011 to March 2012). The Wandoo Creek catchment site was moved downstream to WNDCK (August 2011) as the former site, SCCIN4, was almost always dry, even in winter. May 2011: South Belmont Main Drain site moved ~100 m upstream from SWS11 (Great Eastern Hwy) to SWS13 (Severin Walk, Abernathy Rd) due to tidal influence at the old site (SWS11). The gauging station has also been moved (~750 m upstream to Cleaver Terrace). April 2011: SCWQIP Claise Brook site moved from SCCIN5 to CB13.
Department of Water and Environmental Regulation 25 Swan Canning Catchment Data Report January - December 2018
October 2006: extra Ellen Brook site (EBAC) added to regular sampling near confluence with Swan River. Stopped sampling March 2009 due to site access issues. Site location changed to West Swan Road Bridge (SWN9) and sampling restarted March 2010. October 2006: Canning River site moved ~500 m downstream from McKenzie Grove to Seaforth for better site access and to align with location of gauging station. Added parameters dissolved organic nitrogen and total organic carbon in October 2006. Total organic carbon was only sampled to July 2008. Added parameters dissolved oxygen and pH in September 2006 (changed instrument from WTW to Quanta). Changed from specific conductivity (compensated at 25°C) to uncompensated conductivity in October 2001 and back to specific conductivity in September 2006. Changed from weekly to fortnightly sampling in 2001.
26 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 1 SWANCATCH Swan and Canning catchment site coordinates.
Latitude S Longitude E Swan-Canning Site Flow Site Sub catchment Code (decimal (decimal Status degrees) degrees)
Mills Street Main Mills St Main Drain, Palm SWS1 32.016546 115.919366 Continuous Drain Place, Cannington
Bannister Creek Bannister Creek, SWS2 32.038306 115.917321 Continuous Hybanthus Rd, Ferndale
Yule Brook Yule Brook, Brixton St SWS3 32.025406 115.967146 Ephemeral
Bickley Brook Bickley Brook Main Drain, SWS4 32.043205 115.976086 Ephemeral Austin Ave, Kenwick
Upper Canning Canning River, Seaforth, SWS12 32.092305 116.016772 Continuous River Gosnells
Southern River Southern River, Anaconda SWS7 32.078355 115.978799 Continuous Drive, Huntingdale
Bayswater Main Bayswater Main Drain, SWS10 31.924246 115.921949 Continuous Drain Slade St, Bayswater
South Belmont South Belmont Main Drain, SWS13 31.949031 115.919732 Continuous Main Drain Severin Walk, Abernathy Road, Belmont
Ellen Brook, Almeria Pde, SWN3 31.751071 116.024830 Ephemeral Upper Swan Ellen Brook Ellen Brook Bridge, West SWN9 31.789477 116.003947 Ephemeral Swan Road, Upper Swan
Avon River Swan River, Upper Swan SWN5 31.781685 116.022904 Continuous (Millendon) Bridge, Great Northern Highway
Jane Brook Jane Brook, Sweeting SWN7 31.862701 116.013985 Ephemeral Bridge, Great Northern Highway, Middle Swan
Blackadder Blackadder Creek, Francis SWN8 31.876150 116.017298 Ephemeral Creek Street, Midland
Helena River Helena River, Whiteman SWN10 31.900081 116.007611 Ephemeral Rd
Susannah Brook Susannah Brook, River Rd SWN11 31.817712 116.014051 Ephemeral
Bennett Brook Bennett Brook, Brook Rd SWN12 31.877703 115.959526 Continuous
Department of Water and Environmental Regulation 27 Swan Canning Catchment Data Report January - December 2018
Table 2 SCWQIP Swan and Canning catchment site coordinates.
Latitude S Longitude E Swan-Canning Flow Site Site Code Sub catchment (decimal (decimal Status degrees) degrees)
South Perth Galway Rd, Manning SCCIS1 32.017333 115.883103 Continuous Wilson Main Drain WIFRD 32.020262 115.915023 Continuous
Bull Creek Beatrice Ave Main Drain BAMDKD 32.035010 115.883725 Continuous Holmes St, Shelley SCCIS2 32.029429 115.888092 Continuous
Lower Canning Cockram St Drain, Grose SCCIS3 32.016435 115.942555 Continuous Av, Cannington
Helm Street Helm St Drain, SCCIS4 32.056492 115.996684 Ephemeral Drain Maddington
Ellis Brook Ellis Brook, Mills St, EBGS01 32.066042 116.001554 Ephemeral Maddington
Southern River Neerigen Brook, Armadale AW05 32.152688 116.002540 Ephemeral
Perth Airport Perth Airport Drain, KANAV 31.931225 115.940908 Continuous South Drain Kanowna Ave, Ascot
Perth Airport Limestone Creek, Great SCCIS12 31.920049 115.961796 Continuous North Drain Eastern Hwy Bypass
Henley Brook Henley Brook, Brockman HBBROCK 31.804066 116.003019 Ephemeral St
Saint Leonards George St access, West SCCIN3 31.837107 115.997803 Ephemeral Creek Swan
Chapman St drain, CSMDREID 31.914643 115.949454 Continuous Ashfield Upper Swan Wandoo Creek, West WNDCK 31.848024 115.992263 Ephemeral Swan
Maylands Maylands/Inglewood Main MIMDOUT 31.936890 115.891175 Continuous Drain
Claise Brook Claise Brook Fountain CB13 31.952561 115.876925 Ephemeral Main Drain Lake Bridge
Mounts Bay Perth Convention Centre CCDRMBRD 31.955570 115.851251 Continuous Main Drain car park (bay #), CBD
28 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Swan & Canning catchment sites SWN3 SCWQIP SWANCATCH Swan-Canning Subcatchments SWN5 Millendon SWN9 Henley Brook
HBBROCK Saint Leonards Creek SWN11 Sussanah Brook Bennett Brook
SCCIN3 Upper Swan WNDCK SWN7 Jane Brook SWN12 SWN8
Blackadder Creek
Bayswater Main Drain SWN10 Claisebrook Main Drain CSMDREID SWS10 SCCIS12 Maylands
KANAV CBD MIMDOUT Perth Airport North SWS13 Helena River CB13 CCDRMBRD South Belmont Perth Airport South
South Perth Mills Street Main Drain Yule Brook SWS1 Downstream SCCIS3 SWS3 SCCIS1 WIFRD SCCIS2 SWS2 Bickley Brook BAMDKD SWS4
Bullcreek Lower Canning Helm Street Munday Brook SCCIS4 Ellis Brook Bannister Creek SWS7EBGS01
SWS12
Upper Canning River
Southern River
AW05
DISCLAIMER: While the Department of Water and Environmental AUTHOR: Dom Heald regulation has made all responsible efforts to ensure the accuracy DATE COMPLETED: 25/09/2018 1:200,000 of this data, the Department accepts no responsibility for any inaccuracies and persons relying on this data do so at their own PATH: (baynup) J:\gisprojects\Project\B_Series\ risk. B5024\GIS Maps\All catchment sites_2018.mxd
Figure 1 Map of Swan and Canning catchment routine monitoring sites.
Department of Water and Environmental Regulation 29 Swan Canning Catchment Data Report January - December 2018
Table 3 Swan and Canning catchment sampling regime.
Parameter measured Swan-Canning catchment sites
Temporal pattern All year, when flowing
Number of sites SWANCATCH x 16, SCWQIP x 17
Spatial pattern Fixed
Sampling frequency Fortnightly
Total suspended solids (TSS) Grab sample
Total nitrogen and phosphorus (TN & TP) Grab sample
Filterable reactive phosphorus, nitrogen as Grab sample (filtered) ammonia/ammonium, total oxidised nitrogen &
dissolved organic nitrogen (FRP, NH3-N/NH4-N, NOx-N, DOrgN)
Dissolved organic carbon (DOC) Grab sample (filtered)
YSI pro DSS (dissolved oxygen, pH, temperature & In-situ specific conductivity)
Field Observations (flow, weather, water All sites appearance)
30 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Summary This Swan Canning Catchment quarterly data report presents data collected from thirty two sites (All sixteen from the SWANCATCH project and sixteen of seventeen from the SCWQIP project; only Mount’s Bay MD is excluded, due to insufficient data – explained below). Data are presented for ten key analytes; total nitrogen, nitrogen as ammonia/ammonium, total oxidised nitrogen, dissolved organic nitrogen, total phosphorus, filterable reactive phosphorus, dissolved organic carbon, total suspended solids, dissolved oxygen and specific conductivity. Each key analyte at every site is presented as a graph showing the previous five years of data as monthly box plots overlain by the current year’s monthly medians. Data for the SCWQIP site on Mount’s Bay MD have not been presented in graphs because sampling only began in 2016, so there is not five years of complete data for the background box plots. This data report is the annual report for 2018 and presents 2018 data from January to December over background data from 2013 to 2017. The background monthly box plots display the median, 25th, 75th, 10th and 90th percentiles where sufficient data exists. The graphical program used (Sigma Plot) requires a minimum of 3 data points to calculate 25th and 75th percentiles and a minimum of 9 data points to calculate 10th and 90th percentiles. Due to the ephemerality of many of the catchment sites and the fortnightly sampling regime, the background monthly sample numbers may often be quite low. For clarity the background monthly sample numbers (n) have been reported on each graph. The limit of reporting was halved when data was below the limit to allow the data to be graphed. The current year’s data (2018) is presented in tables showing monthly minimum, maximum and median values and the number of samples collected for each analyte. Data, collected from all sixteen SWANCATCH and all seventeen of the SCWQIP sites, are also displayed in tabular form near the end of this report as means and standard deviations of the ten key analytes displayed, for all sites, in one comparison table; all available data for the current year are used. Annual rainfall in 2018 was near average across the Greater Perth region, with annual minimum and maximum temperatures generally close to the average as well. The Perth Metro site recorded its second highest daily rainfall for January with 96.2 mm falling on 16th January 2018. August was a very wet month; the Perth Metro site recorded its highest monthly total for August of 186 mm, (BOM annual weather summary).
Department of Water and Environmental Regulation 31 Swan Canning Catchment Data Report January - December 2018
1 Avon River (SWN5)
7
SWN5 (AVON) TN 2013-2017 data 2018 data 6
5 )
-1 4
3 TN (mgL
2
1
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=5 n=4 n=6 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=10
Figure 2 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R).
0.30
SWN5 (AVON) NH3-N
0.25 2013-2017 data 2018 data
0.20 ) -1
0.15 -N(mg L 3 NH 0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=5 n=4 n=6 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=10
+ -1 Figure 3 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R).
32 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
1.0 SWN5 (AVON) NOx-N 2013-2017 data 2018 data
0.8 )
-1 0.6
0.4 NOx-N(mg L
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=5 n=4 n=6 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=10
Figure 4 2018 Total Oxidised Nitrogen (NOx-N) (mg.L -1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R).
3.0
SWN5 (AVON) DOrgN 2013-2017 data 2018 data 2.5
2.0 ) -1
1.5 DOrgN(mg L 1.0
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=5 n=4 n=6 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=10
Figure 5 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R).
Department of Water and Environmental Regulation 33 Swan Canning Catchment Data Report January - December 2018
0.5 SWN5 (AVON) TP
2013-2017 data 0.4 2018 data
) 0.3 -1
TP(mg L 0.2
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=5 n=4 n=6 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=10
Figure 6 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R).
0.10 SWN5 (AVON) FRP 2013-2017 data 2018 data
0.08
) 0.06 -1
FRP(mg L 0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=5 n=4 n=6 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=10
Figure 7 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R).
34 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
50
SWN5 (AVON) DOC 2013-2017 data 2018 data
40
) 30 -1
DOC(mg L 20
10
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=5 n=4 n=6 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=10
Figure 8 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R).
70
SWN5 (AVON) TSS 2013-2017 data 2018 data 60
50 ) -1 40
30 TSS(mg L
20
10
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=5 n=4 n=6 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=10
Figure 9 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R).
Department of Water and Environmental Regulation 35 Swan Canning Catchment Data Report January - December 2018
14 SWN5 (AVON) DO 2013-2017 data 2018 data 12
10 )
-1 8
6 DO(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=5 n=4 n=6 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=10
Figure 10 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R).
35 SWN5 (AVON) Sp. Conductivity 2013-2017 data 2018 data 30
25 ) -1
20
15 Sp.Cond (mS cm
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=5 n=4 n=6 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=10
Figure 11 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN5 (Avon R).
36 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Avon River (Walyunga) 2018 flow 14000
12000
10000
8000
6000
4000 Daily discharge (ML) Daily discharge
2000
0
Date
Figure 12 2018 Avon R flow at Walyunga (616011) – Daily discharge hydrograph measured in megalitres.
Please note this flow data is from the Walyunga gauging station (616011) which is approximately 7 Km upstream of site SWN5 where the nutrient data is collected for the SWANCATCH project.
Department of Water and Environmental Regulation 37 Swan Canning Catchment Data Report January - December 2018
Table 4 2018 monthly sample numbers, minimum and maximum values at site SWN5 (Avon R).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 1.10 1.30 1.10 0.93 1.00 1.00 1.30 1.30 1.00 0.58 0.67 0.69 max 2.00 1.40 2.10 1.00 1.10 1.60 2.30 2.20 1.60 0.81 0.69 0.75 med 1.55 1.35 1.60 0.97 1.00 1.30 1.80 1.75 1.30 0.69 0.68 0.72
-1 NH3-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.022 0.056 0.042 0.045 0.039 0.015 0.047 0.032 0.013 0.010 0.023 0.011 max 0.022 0.071 0.320 0.055 0.044 0.017 0.056 0.072 0.028 0.025 0.023 0.020 med 0.022 0.064 0.181 0.050 0.042 0.016 0.052 0.052 0.021 0.017 0.023 0.016
-1 NOx-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min <0.01 0.021 0.130 0.037 0.022 0.250 0.520 0.500 0.110 <0.01 <0.01 0.010 max 0.019 0.038 0.380 0.049 0.250 0.520 1.300 0.860 0.230 0.049 <0.01 0.022 med 0.012 0.030 0.255 0.043 0.029 0.385 0.910 0.680 0.170 0.024 <0.01 0.016 DOrgN (mg.L-1) n 2 2 2 2 3 2 2 2 1 3 2 2 min 1.00 1.20 0.97 0.74 0.62 0.73 0.73 0.78 0.72 0.50 0.58 0.63 max 1.30 1.30 1.40 0.93 0.94 0.93 0.75 1.10 0.72 0.61 0.66 0.68 med 1.15 1.25 1.19 0.84 0.90 0.83 0.74 0.94 0.72 0.60 0.62 0.66 TP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.023 0.016 0.017 0.01 0.015 0.012 0.005 0.031 0.017 <0.005 0.016 0.015 max 0.063 0.022 0.024 0.012 0.021 0.029 0.019 0.06 0.027 0.019 0.016 0.017 med 0.043 0.019 0.021 0.011 0.015 0.021 0.012 0.046 0.022 0.009 0.016 0.016 FRP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min <0.005 0.005 0.006 <0.005 <0.005 0.006 <0.005 0.021 0.011 <0.005 0.012 <0.005 max 0.011 0.006 0.012 0.005 0.011 0.017 0.014 0.027 0.017 0.010 0.014 0.006 med 0.007 0.006 0.009 0.004 0.009 0.012 0.008 0.024 0.014 0.008 0.013 0.004 DOC (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 19 23 17 17 15 16 14 15 13 13 12 14 max 25 24 23 19 19 16 17 20 15 13 14 14 med 22 23.5 20 18 18 16 15.5 17.5 14 13 13 14 TSS (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 3 3 <1 2 2 3 9 9 3 4 5 3 max 23 5 2 3 3 7 12 36 10 6 6 3 med 13 4 1.25 2.5 3 5 10.5 22.5 6.5 6 5.5 3
38 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 4.17 3.67 4.96 6.09 6.48 9.66 10.12 9.75 9.93 7.65 7.36 6.13 max 6.91 7.11 6.25 7.43 9.28 10.18 10.61 10.08 10.72 9.14 7.76 6.31 med 5.54 5.39 5.61 6.76 7.09 9.92 10.37 9.92 10.33 9.02 7.56 6.22 Sp. Conductivity (mS.cm-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 13.53 15.73 7.44 8.56 9.28 11.79 9.01 5.46 6.16 8.10 9.39 9.97 max 18.26 17.32 9.44 9.25 12.23 13.46 10.92 6.62 7.44 9.23 9.75 10.42 med 15.90 16.53 8.44 8.91 12.09 12.63 9.96 6.04 6.80 8.33 9.57 10.19
The beginning of 2018 saw high rainfall during mid-January, which resulted in unseasonable flow throughout the Avon and Upper Swan catchment, but nothing like the extent of the summer floods of 2017. The hydrograph for Walyunga recorded a relatively small peak during January, however this additional flow was sufficient to keep the upper Swan River flowing at the sampling site through the remainder of the dry season. Usually the upper Swan River doesn’t flow at the catchment sampling site during summer and autumn months. The 2018 data largely followed the background data (some of which exhibits high variability). With the exception of a spike in total oxidised nitrogen during winter. The Upper Swan site usually records higher total oxidised nitrogen concentrations over winter but the 2018 seasonal spike was greater than usual (but still less than 1 mg/L) and this is reflected in slightly elevated total nitrogen concentrations over the same period, although the divergence from the background data isn’t as pronounced as it is for total oxidised nitrogen.
Department of Water and Environmental Regulation 39 Swan Canning Catchment Data Report January - December 2018
2 Bannister Creek (SWS2)
2.5 SWS2 (BANNISTER) TN
2013-2017 data 2.0 2018 data
) 1.5 -1
TN (mgL 1.0
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 13 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS2 (Bannister Ck).
The 90th Percentile for June was 0.58 mg.L-1 0.35
SWS2 (BANNISTER) NH3-N 2013-2017 data 2018 data 0.30
0.25 ) -1 0.20 -N(mg L
3 0.15 NH
0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
+ -1 Figure 14 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS2 (Bannister Ck).
40 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
1.0 SWS2 (BANNISTER) NOx-N
2013-2017 data 0.8 2018 data )
-1 0.6
0.4 NOx-N(mg L
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 15 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS2 (Bannister Ck).
1.8
SWS2 (BANNISTER) DOrgN 2013-2017 data 1.6 2018 data
1.4
1.2 ) -1 1.0
0.8 DOrgN(mg L 0.6
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 16 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS2 (Bannister Ck).
Department of Water and Environmental Regulation 41 Swan Canning Catchment Data Report January - December 2018
The 90th Percentile for May was 0.86 mg.L-1 0.30 SWS2 (BANNISTER) TP
2013-2017 data 0.25 2018 data
0.20 ) -1
0.15 TP(mg L
0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 17 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS2 (Bannister Ck).
The 90th Percentile for May was 0.68 mg.L-1 0.25 SWS2 (BANNISTER) FRP
2013-2017 data 2018 data 0.20
) 0.15 -1
FRP(mg L 0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 18 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS2 (Bannister Ck).
42 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
40 SWS2 (BANNISTER) DOC 2013-2017 data 2018 data
30 ) -1
20 DOC(mg L
10
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 19 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS2 (Bannister Ck).
22 SWS2 (BANNISTER) TSS 20 2013-2017 data 2018 data 18
16
14 ) -1 12
10 TSS(mg L 8
6
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 20 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS2 (Bannister Ck).
Department of Water and Environmental Regulation 43 Swan Canning Catchment Data Report January - December 2018
12 SWS2 (BANNISTER) DO 2013-2017 data 2018 data 10
8 ) -1
6 DO(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 21 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS2 (Bannister Ck).
1.8 SWS2 (BANNISTER) Sp. Conductivity 2013-2017 data 1.6 2018 data
1.4
) 1.2 -1
1.0
0.8
Sp.Cond (mS cm 0.6
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 22 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS2 (Bannister Ck).
44 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Bannister Ck (Acacia Pl) 2018 flow 180 160 140 120 100 80 60
Daily discharge (ML) discharge Daily 40 20 0
Date
Figure 23 2018 Bannister Creek flow at Acacia Place (616134) – Daily discharge hydrograph measured in megalitres.
Please note: flow data is from the Acacia Place gauging station (616134) which is approximately 1 Km upstream of site SWS2 where the nutrient data is collected for the SWANCATCH project. The 2018 hydrograph shows peak flow during winter, declining during spring to base flows over summer and autumn. It also captured the flow response to the rain event on 16th January 2018 (96.2mm).
Department of Water and Environmental Regulation 45 Swan Canning Catchment Data Report January - December 2018
Table 5 2018 monthly sample numbers, minimum and maximum values at SWS2 (Bannister Ck).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 1.40 1.30 1.50 1.50 1.00 0.53 1.50 1.60 1.40 1.60 1.90 1.30 max 1.40 1.50 1.50 1.80 1.60 1.00 1.80 2.10 3.10 2.40 2.00 1.40 med 1.40 1.40 1.50 1.65 1.50 0.77 1.65 1.85 2.25 2.20 1.95 1.35
-1 NH3-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.044 0.065 0.085 0.097 0.098 0.076 0.090 0.090 0.200 0.056 0.067 0.041 max 0.066 0.073 0.089 0.130 0.130 0.097 0.170 0.200 0.200 0.180 0.091 0.051 med 0.055 0.069 0.087 0.114 0.120 0.087 0.130 0.145 0.200 0.098 0.079 0.046
-1 NOx-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.045 0.093 0.110 0.160 0.220 0.130 0.570 0.730 0.540 0.560 0.630 0.110 max 0.170 0.160 0.120 0.180 0.280 0.300 0.770 0.850 1.000 1.200 0.680 0.150 med 0.108 0.127 0.115 0.170 0.260 0.215 0.670 0.790 0.770 0.940 0.655 0.130 DOrgN (mg.L-1) n 2 2 2 2 3 2 2 2 1 3 2 2 min 1.10 1.00 1.20 1.10 0.48 0.27 0.73 0.73 0.57 0.78 0.93 0.93 max 1.20 1.10 1.20 1.30 1.00 0.65 0.84 0.93 0.57 1.00 1.00 1.00 med 1.15 1.05 1.20 1.20 1.00 0.46 0.79 0.83 0.57 0.82 0.97 0.97 TP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.085 0.080 0.095 0.100 0.085 0.056 0.056 0.059 0.049 0.066 0.096 0.100 max 0.088 0.084 0.098 0.130 0.110 0.060 0.063 0.072 0.080 0.072 0.099 0.100 med 0.087 0.082 0.097 0.115 0.110 0.058 0.060 0.066 0.065 0.067 0.098 0.100 FRP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.039 0.046 0.058 0.063 0.061 0.024 0.039 0.035 0.037 0.040 0.055 0.053 max 0.051 0.048 0.065 0.064 0.076 0.035 0.043 0.043 0.047 0.042 0.055 0.063 med 0.045 0.047 0.062 0.064 0.068 0.030 0.041 0.039 0.042 0.041 0.055 0.058 DOC (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 25 27 25 27 14 5 18 20 16 21 25 27 max 29 27 26 30 25 13 22 23 28 27 28 27 med 27 27 25.5 28.5 24 9 20 21.5 22 27 26.5 27 TSS (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 6 6 5 9 5 4 3 3 5 5 7 9 max 7 8 6 16 7 5 3 6 7 6 11 12 med 6.5 7 5.5 12.5 5 4.5 3 4.5 6 5 9 10.5
46 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 3.44 3.87 4.13 4.04 5.16 8.70 8.83 8.69 8.09 6.54 5.69 5.00 max 5.62 4.93 4.24 4.80 7.94 9.46 8.83 8.86 8.81 7.50 5.84 5.49 med 4.53 4.40 4.19 4.42 5.18 9.08 8.83 8.78 8.45 7.25 5.77 5.25 Sp. Conductivity (mS.cm-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.726 0.882 1.077 0.954 0.502 0.155 0.552 0.512 0.396 0.587 0.768 0.846 max 1.028 0.952 1.112 1.185 0.988 0.450 0.690 0.589 0.690 0.738 0.812 0.946 med 0.877 0.917 1.095 1.070 0.934 0.303 0.621 0.551 0.543 0.692 0.790 0.896
The 2018 Bannister Creek data generally followed the background data, (which is highly variable for many parameters), with the exception of notably elevated concentrations of total nitrogen and total oxidised nitrogen during late winter and spring. While this seasonal response to flow in total nitrogen and total oxidised nitrogen is normal, variability is high (for total oxidised nitrogen particularly); however there is no obvious explanation as to why this spike was higher than expected (based on past data), other than to suggest some uncharacteristic input of nitrogen in the catchment.
Department of Water and Environmental Regulation 47 Swan Canning Catchment Data Report January - December 2018
3 Bayswater Main Drain (SWS10)
3.0
SWS10 (BAYSWATER) TN 2013-2017 data 2018 data 2.5
2.0 ) -1
1.5 TN(mg L
1.0
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 24 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS10 (Bayswater MD).
1.4
SWS10 (BAYSWATER) NH3-N
1.2 2013-2017 data 2018 data
1.0 ) -1 0.8 -N(mg L
3 0.6 NH
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
+ -1 Figure 25 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS10 (Bayswater MD).
48 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
The 90th Percentile for Jul was 1.43 mg.L-1 0.8 SWS10 (BAYSWATER) NOx-N 2013-2017 data 2018 data
0.6 ) -1
0.4 NOx-N(mg L
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 26 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS10 (Bayswater MD).
1.2 SWS10 (BAYSWATER) DOrgN
1.0 2013-2017 data 2018 data
0.8 ) -1
0.6 DOrgN(mg L 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 27 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS10 (Bayswater MD).
Department of Water and Environmental Regulation 49 Swan Canning Catchment Data Report January - December 2018
The 90th Percentile for Jul was 0.38 mg.L-1 0.25 SWS10 (BAYSWATER) TP 2013-2017 data 2018 data
0.20
) 0.15 -1
TP(mg L 0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 28 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS10 (Bayswater MD).
0.06
SWS10 (BAYSWATER) FRP 2013-2017 data 2018 data 0.05
0.04 ) -1
0.03 FRP(mg L
0.02
0.01
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 29 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS10 (Bayswater MD).
50 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
25 SWS10 (BAYSWATER) DOC 2013-2017 data 2018 data
20
) 15 -1
DOC(mg L 10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 30 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS10 (Bayswater MD).
The 90th Percentile for Jul was 118 mg.L-1 70
SWS10 (BAYSWATER) TSS 2013-2017 data 2018 data 60
50 ) -1 40
30 TSS(mg L
20
10
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 31 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS10 (Bayswater MD).
Department of Water and Environmental Regulation 51 Swan Canning Catchment Data Report January - December 2018
14
SWS10 (BAYSWATER) DO 2013-2017 data 2018 data 12
10 )
-1 8
6 DO(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 32 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS10 (Bayswater MD).
1.2
SWS10 (BAYSWATER) Sp. Conductivity 2013-2017 data 2018 data 1.0
) 0.8 -1
0.6
Sp.Cond (mS cm 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 33 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS10 (Bayswater MD).
52 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 6 2018 monthly sample numbers, minimum and maximum values at SWS10 (Bayswater MD).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 1.20 1.30 1.40 1.50 1.40 1.10 1.30 1.30 1.20 1.10 0.98 0.99 max 1.50 1.40 1.50 1.90 1.70 1.50 1.40 1.50 2.10 1.10 1.00 1.30 med 1.35 1.35 1.45 1.70 1.40 1.30 1.35 1.40 1.65 1.10 0.99 1.15
-1 NH3-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.190 0.190 0.280 0.280 0.280 0.130 0.200 0.140 0.120 0.097 0.076 0.120 max 0.260 0.280 0.350 0.290 0.350 0.240 0.210 0.170 0.130 0.110 0.100 0.120 med 0.225 0.235 0.315 0.285 0.280 0.185 0.205 0.155 0.125 0.100 0.088 0.120
-1 NOx-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.30 0.28 0.46 0.55 0.46 0.24 0.52 0.50 0.47 0.31 0.31 0.32 max 0.36 0.46 0.47 0.58 0.57 0.39 0.58 0.66 0.52 0.43 0.35 0.35 med 0.33 0.37 0.47 0.57 0.52 0.32 0.55 0.58 0.50 0.38 0.33 0.34 DOrgN (mg.L-1) n 2 2 2 2 3 2 2 2 1 3 2 2 min 0.63 0.55 0.46 0.53 0.39 0.31 0.51 0.57 0.53 0.51 0.46 0.54
max 0.68 0.55 0.54 0.61 0.63 0.69 0.60 0.62 0.53 0.55 0.54 0.55 med 0.66 0.55 0.50 0.57 0.51 0.50 0.56 0.60 0.53 0.53 0.50 0.55 TP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.048 0.066 0.061 0.057 0.061 0.062 0.058 0.052 0.033 0.034 0.041 0.054 max 0.081 0.067 0.064 0.160 0.210 0.290 0.062 0.066 0.062 0.046 0.046 0.110 med 0.065 0.067 0.063 0.109 0.074 0.176 0.060 0.059 0.048 0.042 0.044 0.082 FRP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.011 0.015 0.017 0.013 0.015 0.026 0.023 0.021 0.021 0.012 0.017 0.016 max 0.027 0.022 0.020 0.016 0.023 0.079 0.027 0.027 0.022 0.020 0.018 0.022 med 0.019 0.019 0.019 0.015 0.019 0.053 0.025 0.024 0.022 0.018 0.018 0.019 DOC (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 17 15 11 16 13 6 15 17 16 16 15 16 max 17 17 13 18 15 14 16 17 18 17 16 17 med 17 16 12 17 13 10 15.5 17 17 17 15.5 16.5 TSS (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 12 12 12 13 11 8 6 5 5 4 6 7 max 14 13 13 44 40 15 8 7 12 7 6 22 med 13 12.5 12.5 28.5 11 11.5 7 6 8.5 5 6 14.5
Department of Water and Environmental Regulation 53 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 6.92 7.21 8.03 7.87 8.22 8.76 8.96 8.99 9.14 8.56 8.92 8.34 max 6.93 7.91 8.05 8.19 8.41 9.34 9.06 9.18 9.28 9.45 9.26 8.85 med 6.93 7.56 8.04 8.03 8.22 9.05 9.01 9.09 9.21 8.94 9.09 8.60 Sp. Conductivity (mS.cm-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.769 0.752 0.795 0.734 0.697 0.213 0.652 0.630 0.662 0.702 0.739 0.747 max 0.790 0.801 0.802 0.792 0.794 0.625 0.686 0.663 0.719 0.737 0.749 0.756 med 0.780 0.777 0.799 0.763 0.719 0.419 0.669 0.647 0.691 0.724 0.744 0.752
Please note, no hydrograph is available for this site for 2018 as the station has been affected by downstream works and is currently not fit for purpose. The Bayswater 2018 data generally followed the background data, with some minor variations, e.g. filterable reactive phosphorus and total phosphorus had notable excursions from the background data in June; but the background data for these parameters also varies greatly during other months, particularly total phosphorus concentrations. Dissolved organic carbon was often higher than the background data in the early part of 2018, but wasn’t elevated compared to data collected in the second half of the year. While background data is more varied in the later part of the year there is no clear reason why concentrations of dissolve organic carbon were elevated (compared to the background data) in the early part of 2018.
54 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
4 Bennett Brook (SWN12)
2.5 SWN12 (BENNETT BK) TN
2013-2017 data 2.0 2018 data
) 1.5 -1
TN (mgL 1.0
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 34 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN12 (Bennett Bk).
The 90th Percentile for Dec was 0.42 mg.L-1 0.10
SWN12 (BENNETT BK) NH3-N 2013-2017 data 0.08 2018 data )
-1 0.06 -N(mg L 3 0.04 NH
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
+ -1 Figure 35 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN12 (Bennett Bk).
Department of Water and Environmental Regulation 55 Swan Canning Catchment Data Report January - December 2018
1.0
SWN12 (BENNETT BK) NOx-N 2013-2017 data 2018 data
0.8 )
-1 0.6
0.4 NOx-N(mg L
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 36 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN12 (Bennett Bk).
1.6 SWN12 (BENNETT BK) DOrgN
1.4 2013-2017 data 2018 data 1.2
) 1.0 -1
0.8
DOrgN(mg L 0.6
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 37 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN12 (Bennett Bk).
56 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
0.25 SWN12 (BENNETT BK) TP
2013-2017 data 0.20 2018 data
) 0.15 -1
TP(mg L 0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 38 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN12 (Bennett Bk).
0.07 SWN12 (BENNETT BK) FRP 2013-2017 data 2018 data 0.06
0.05 ) -1 0.04
0.03 FRP(mg L
0.02
0.01
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 39 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN12 (Bennett Bk).
Department of Water and Environmental Regulation 57 Swan Canning Catchment Data Report January - December 2018
35
SWN12 (BENNETT BK) DOC 2013-2017 data 2018 data 30
25 ) -1 20
15 DOC(mg L
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 40 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN12 (Bennett Bk).
40 SWN12 (BENNETT BK) TSS
2013-2017 data 2018 data 30 ) -1
20 TSS(mg L
10
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 41 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN12 (Bennett Bk).
58 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
10 SWN12 (BENNETT BK) DO
8
) 6 -1
DO(mg L 4
2
2013-2017 data 2018 data
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 42 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN12 (Bennett Bk).
1.0
SWN12 (BENNETT BK) Sp. Conductivity 2013-2017 data 2018 data
0.8 ) -1 0.6
0.4 Sp.Cond (mS cm
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=13
Figure 43 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN12 (Bennett Bk).
Department of Water and Environmental Regulation 59 Swan Canning Catchment Data Report January - December 2018
Bennett Bk (SWN12) 2018 flow 250
200
150
100 Daily discharge (ML) discharge Daily 50
0
Date
Figure 44 2018 Bennett Bk flow (616084) – Daily discharge hydrograph measured in megalitres.
The 2018 hydrograph for Bennet Brook illustrates the catchment’s response to the unseasonable summer rain event of 16th Jan 2018 (9.2 mm, as well as the catchment’s flow in response to winter rain and base flow conditions for the remainder of the year.
60 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 7 2018 monthly sample numbers, minimum and maximum values at SWN12 (Bennett Bk).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.92 0.86 0.82 0.96 0.99 1.10 1.30 1.40 1.40 1.10 1.00 0.95 max 1.10 0.95 0.93 1.30 1.10 1.20 1.40 1.60 2.20 1.40 1.10 0.97 med 1.01 0.91 0.88 1.13 1.10 1.15 1.35 1.50 1.80 1.20 1.05 0.96
-1 NH3-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.037 0.035 0.035 0.036 0.043 0.036 0.038 0.035 0.032 0.031 0.026 0.011 max 0.060 0.042 0.053 0.074 0.082 0.061 0.046 0.039 0.034 0.036 0.043 0.038 med 0.049 0.039 0.044 0.055 0.051 0.049 0.042 0.037 0.033 0.035 0.035 0.025
-1 NOx-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.12 0.16 0.16 0.21 0.29 0.25 0.42 0.42 0.40 0.30 0.28 0.19 max 0.19 0.17 0.19 0.33 0.39 0.43 0.56 0.56 0.41 0.37 0.29 0.21 med 0.16 0.17 0.18 0.27 0.35 0.34 0.49 0.49 0.41 0.30 0.29 0.20 DOrgN (mg.L-1) n 2 2 2 2 3 2 2 2 1 3 2 2 min 0.75 0.65 0.53 0.59 0.52 0.51 0.73 0.94 0.91 0.68 0.62 0.68 max 0.77 0.73 0.67 0.61 0.63 0.61 0.97 0.96 0.91 0.98 0.69 0.73 med 0.76 0.69 0.60 0.60 0.54 0.56 0.85 0.95 0.91 0.72 0.66 0.71 TP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.051 0.050 0.049 0.050 0.039 0.046 0.038 0.051 0.033 0.047 0.065 0.052 max 0.100 0.068 0.100 0.071 0.066 0.170 0.049 0.059 0.059 0.058 0.066 0.068 med 0.076 0.059 0.075 0.061 0.056 0.108 0.044 0.055 0.046 0.057 0.066 0.060 FRP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.021 0.030 0.026 0.021 0.015 0.021 0.019 0.025 0.024 0.021 0.025 0.024 max 0.052 0.031 0.029 0.024 0.024 0.022 0.021 0.026 0.026 0.023 0.029 0.027 med 0.037 0.031 0.028 0.023 0.023 0.022 0.020 0.026 0.025 0.021 0.027 0.026 DOC (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 20 18 14 17 14 12 19 24 22 20 17 19 max 20 19 16 20 16 16 23 26 24 22 19 19 med 20 18.5 15 18.5 15 14 21 25 23 21 18 19 TSS (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 5 5 4 6 2 4 3 3 3 6 7 4 max 8 8 5 11 8 35 3 3 5 7 7 9 med 6.5 6.5 4.5 8.5 6 19.5 3 3 4 6 7 6.5
Department of Water and Environmental Regulation 61 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 4.71 4.84 5.63 6.06 6.67 6.93 7.31 7.38 7.70 6.86 6.89 6.58 max 5.03 5.69 6.11 6.23 7.10 7.52 7.50 7.70 8.06 7.56 7.28 6.99 med 4.87 5.27 5.87 6.15 6.94 7.23 7.41 7.54 7.88 7.11 7.09 6.79 Sp. Conductivity (mS.cm-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.597 0.626 0.659 0.655 0.589 0.315 0.535 0.548 0.585 0.583 0.613 0.605 max 0.654 0.650 0.684 0.660 0.649 0.542 0.601 0.581 0.603 0.610 0.614 0.615 med 0.626 0.638 0.672 0.658 0.638 0.429 0.568 0.565 0.594 0.606 0.614 0.610
The 2018 Bennett Brook data largely followed the background data with two notable exceptions. A spike in total phosphorus correlated with an associated spike in total suspended solids in June; both were due to elevated concentrations in the sample collected on 27th June 2018 when it was noted there was high flow and the water appeared slightly turbid. At the time the sample was collected nearly 15 mm of rain had fallen in the 24 hours prior to sampling and nearly the same amount fell during the day of sampling. Nitrogen exhibited a seasonal response to rainfall with total nitrogen, total oxidised nitrogen and dissolved organic nitrogen all peaking during late winter in response to rainfall and surface run off; but it should be noted than many of the parameters in this catchment exhibit high variability through winter and spring particularly, and less in base flow conditions.
62 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
5 Bickley Brook (SWS4)
5
SWS4 (BICKLEY BK) TN 2013-2017 data 2018 data
4
) 3 -1
TN (mgL 2
1
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=4 n=6 n=6 n=9 n=12 n=12 n=10 n=10 n=10 n=11 n=11
Figure 45 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS4 (Bickley Bk).
0.12
SWS4 (BICKLEY BK) NH3-N 2013-2017 data 2018 data 0.10
0.08 ) -1
0.06 -N(mg L 3 NH 0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=4 n=6 n=6 n=9 n=12 n=12 n=10 n=10 n=10 n=11 n=11
+ -1 Figure 46 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS4 (Bickley Bk).
Department of Water and Environmental Regulation 63 Swan Canning Catchment Data Report January - December 2018
4
SWS4 (BICKLEY BK) NOx-N 2013-2017 data 2018 data
3 ) -1
2 NOx-N(mg L
1
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=4 n=6 n=6 n=9 n=12 n=12 n=10 n=10 n=10 n=11 n=11
Figure 47 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS4 (Bickley Bk).
1.4
SWS4 (BICKLEY BK) DOrgN 2013-2017 data 2018 data 1.2
1.0 ) -1 0.8
0.6 DOrgN(mg L
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=4 n=6 n=6 n=9 n=12 n=12 n=10 n=10 n=10 n=11 n=11
Figure 48 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS4 (Bickley Bk).
64 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
0.35
SWS4 (BICKLEY BK) TP 2013-2017 data 2018 data 0.30
0.25 )
-1 0.20
0.15 TP(mg L
0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=4 n=6 n=6 n=9 n=12 n=12 n=10 n=10 n=10 n=11 n=11
Figure 49 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS4 (Bickley Bk).
0.12 SWS4 (BICKLEY BK) FRP
0.10 2013-2017 data 2018 data
0.08 ) -1
0.06 FRP(mg L
0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=4 n=6 n=6 n=9 n=12 n=12 n=10 n=10 n=10 n=11 n=11
Figure 50 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS4 (Bickley Bk).
Department of Water and Environmental Regulation 65 Swan Canning Catchment Data Report January - December 2018
30 SWS4 (BICKLEY BK) DOC
2013-2017 data 25 2018 data
20 ) -1
15 DOC(mg L
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=4 n=6 n=6 n=9 n=12 n=12 n=10 n=10 n=10 n=11 n=11
Figure 51 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS4 (Bickley Bk).
The 90th Percentile for Aug was 41 mg.L-1
14
SWS4 (BICKLEY BK) TSS 2013-2017 data 2018 data 12
10 ) -1 8
6 TSS(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=4 n=6 n=6 n=9 n=12 n=12 n=10 n=10 n=10 n=11 n=11
Figure 52 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS4 (Bickley Bk).
66 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
14
SWS4 (BICKLEY BK) DO 2013-2017 data 2018 data 12
10 )
-1 8
6 DO(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=4 n=6 n=6 n=9 n=12 n=12 n=10 n=10 n=10 n=11 n=11
Figure 53 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS4 (Bickley Bk).
4 SWS4 (BICKLEY BK) Sp. Conductivity 2013-2017 data 2018 data
3 ) -1
2 Sp.Cond (mS cm
1
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=4 n=4 n=6 n=6 n=9 n=12 n=12 n=10 n=10 n=10 n=11 n=11
Figure 54 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS4 (Bickley Bk).
Department of Water and Environmental Regulation 67 Swan Canning Catchment Data Report January - December 2018
Table 8 2018 monthly sample numbers, minimum and maximum values at SWS4 (Bickley Bk).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 2 2 0 1 2 2 2 2 2 3 2 1 min 0.81 0.82 - 1.40 0.34 0.61 2.40 1.70 1.10 0.37 0.55 0.75 max 0.99 1.20 - 1.40 1.10 2.50 2.90 2.30 2.10 1.00 0.60 0.75 med 0.90 1.01 - 1.40 0.72 1.56 2.65 2.00 1.60 0.96 0.58 0.75
-1 NH3-N (mg.L ) n 2 2 0 1 2 2 2 2 2 3 2 1 min 0.013 0.022 - <0.01 0.020 0.017 0.019 0.026 0.016 0.015 <0.01 0.011 max 0.023 0.024 - <0.01 0.160 0.088 0.033 0.031 0.023 0.034 0.012 0.011 med 0.018 0.023 - <0.01 0.090 0.053 0.026 0.029 0.020 0.023 0.009 0.011
-1 NOx-N (mg.L ) n 2 2 0 1 2 2 2 2 2 3 2 1 min <0.01 <0.01 - <0.01 <0.01 0.330 2.100 1.300 0.670 <0.01 <0.01 0.010 max 0.017 <0.01 - <0.01 0.390 1.800 2.100 1.800 0.820 0.690 <0.01 0.010 med 0.011 <0.01 - <0.01 0.198 1.065 2.100 1.550 0.745 0.510 <0.01 0.010 DOrgN (mg.L-1) n 2 2 0 1 2 2 2 2 1 3 2 1 min 0.70 0.61 - 1.10 0.19 0.26 0.32 0.38 0.43 0.28 0.48 0.67 max 0.92 0.76 - 1.10 0.44 0.62 0.57 0.38 0.43 0.35 0.58 0.67 med 0.81 0.69 - 1.10 0.32 0.44 0.45 0.38 0.43 0.31 0.53 0.67 TP (mg.L-1) n 2 2 0 1 2 2 2 2 2 3 2 1 min 0.079 0.062 - 0.190 0.064 0.035 0.017 0.038 0.009 0.006 0.037 0.140 max 0.170 0.093 - 0.190 0.082 0.068 0.041 0.044 0.035 0.032 0.067 0.140 med 0.125 0.078 - 0.190 0.073 0.052 0.029 0.041 0.022 0.023 0.052 0.140 FRP (mg.L-1) n 2 2 0 1 2 2 2 2 2 3 2 1 min <0.005 <0.005 - 0.032 0.031 0.019 0.009 0.017 0.009 0.005 0.008 0.029 max 0.039 0.008 - 0.032 0.032 0.026 0.023 0.022 0.009 0.014 0.015 0.029 med 0.021 0.005 - 0.032 0.032 0.023 0.016 0.020 0.009 0.014 0.012 0.029 DOC (mg.L-1) n 2 2 0 1 2 2 2 2 2 3 2 1 min 12 12 - 27 3 4 7 7 5 6 10 14 max 18 15 - 27 8 7 8 8 6 8 13 14 med 15 13.5 - 27 5.5 5.5 7.5 7.5 5.5 6 11.5 14 TSS (mg.L-1) n 2 2 0 1 2 2 2 2 2 3 2 1 min 3 4 - 5 2 1 2 4 2 1 4 6 max 4 9 - 5 3 11 6 5 7 7 7 6 med 3.5 6.5 - 5 2.5 6 4 4.5 4.5 2 5.5 6
68 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 2 2 0 1 2 2 2 2 2 3 2 1 min 3.42 2.73 - 2.74 2.31 4.97 8.30 8.76 10.02 8.03 7.75 6.51 max 5.11 6.51 - 2.74 4.35 7.73 8.53 9.57 10.34 10.55 7.84 6.51 med 4.27 4.62 - 2.74 3.33 6.35 8.42 9.17 10.18 8.69 7.80 6.51 Sp. Conductivity (mS.cm-1) n 2 2 0 1 2 2 2 2 2 3 2 1 min 1.220 1.507 - 1.984 0.425 0.170 0.671 0.498 0.474 0.807 1.453 2.062 max 2.170 1.788 - 1.984 0.872 0.743 0.837 0.581 0.759 1.148 1.701 2.062 med 1.695 1.648 - 1.984 0.649 0.457 0.754 0.540 0.617 0.925 1.577 2.062
Please note there is no hydrograph for this catchment as the Water Corporation supplied data was deemed not fit for purpose. In Bickley Brook, during 2018, many parameters were elevated compared to the background data when flows resumed in April; including dissolved organic nitrogen, total phosphorus, dissolved organic carbon, as well as ammoniacal nitrogen in May. This isn’t unusual however as many of the measured parameters are highly variable in this small catchment which is highly modified, particularly in its lower reaches, and responds very flashily to rainfall.
Department of Water and Environmental Regulation 69 Swan Canning Catchment Data Report January - December 2018
6 Blackadder Creek (SWN8) The 90th Percentile for Jul was 5.78 mg.L-1 3.0 SWN8 (BLACKADDER) TN 2013-2017 data 2018 data 2.5
2.0 ) -1
1.5 TN (mgL
1.0
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=1 n=2 n=4 n=4 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=7
Figure 55 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN8 (Blackadder Ck).
The 90th Percentile for Jul was 2.05 mg.L-1 0.30
SWN8 (BLACKADDER) NH3-N 2013-2017 data 2018 data 0.25
0.20 ) -1
0.15 -N(mg L 3 NH 0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=1 n=2
+ -1 Figure 56 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN8 (Blackadder Ck).
70 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
The 90th Percentile for Jul was 3.33 mg.L-1 2.0
SWN8 (BLACKADDER) NOx-N 2013-2017 data 2018 data
1.5 ) -1
1.0 NOx-N(mg L
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=1 n=2 n=4 n=4 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=7
Figure 57 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN8 (Blackadder Ck).
1.6 SWN8 (BLACKADDER) DOrgN
1.4 2013-2017 data 2018 data 1.2
) 1.0 -1
0.8
DOrgN(mg L 0.6
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=1 n=2 n=4 n=4 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=7
Figure 58 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN8 (Blackadder Ck).
Department of Water and Environmental Regulation 71 Swan Canning Catchment Data Report January - December 2018
0.6 SWN8 (BLACKADDER) TP
0.5 2013-2017 data 2018 data
0.4 ) -1
0.3 TP(mg L
0.2
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=1 n=2 n=4 n=4 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=7
Figure 59 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN8 (Blackadder Ck).
0.16 SWN8 (BLACKADDER) FRP 0.14 2013-2017 data 2018 data 0.12
0.10 ) -1
0.08 FRP(mg L 0.06
0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=1 n=2 n=4 n=4 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=7
Figure 60 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN8 (Blackadder Ck).
72 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
30 SWN8 (BLACKADDER) DOC
2013-2017 data 25 2018 data
20 ) -1
15 DOC(mg L
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=1 n=2 n=4 n=4 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=7
Figure 61 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN8 (Blackadder Ck).
The 90th Percentile for Aug was 45 mg.L-1 30
SWN8 (BLACKADDER) TSS 2013-2017 data 2018 data 25
20 ) -1
15 TSS(mg L
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=1 n=2 n=4 n=4 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=7
Figure 62 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN8 (Blackadder Ck).
Department of Water and Environmental Regulation 73 Swan Canning Catchment Data Report January - December 2018
12 SWN8 (BLACKADDER) DO
10 2013-2017 data 2018 data
8 ) -1
6 DO(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=1 n=2 n=4 n=4 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=7
Figure 63 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN8 (Blackadder Ck).
2.5 SWN8 (BLACKADDER) Sp. Conductivity
2013-2017 data 2.0 2018 data ) -1 1.5
1.0 Sp.Cond (mS cm
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=1 n=2 n=4 n=4 n=8 n=12 n=12 n=10 n=10 n=10 n=11 n=7
Figure 64 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN8 (Blackadder Ck).
74 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 9 2018 monthly sample numbers, minimum and maximum values at SWN8 (Blackadder Ck).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 0 0 0 0 1 2 2 2 2 3 2 0 min - - - - 0.69 0.73 1.10 1.20 0.96 0.52 0.45 - max - - - - 0.69 0.91 1.50 2.40 1.70 0.77 0.55 - med - - - - 0.69 0.82 1.30 1.80 1.33 0.77 0.50 -
-1 NH3-N (mg.L ) n 0 0 0 0 1 2 2 2 2 3 2 0 min - - - - 0.023 0.010 0.015 0.013 0.012 0.013 <0.01 - max - - - - 0.023 0.018 0.021 0.025 0.015 0.018 <0.01 - med - - - - 0.023 0.014 0.018 0.019 0.014 0.016 <0.01 -
-1 NOx-N (mg.L ) n 0 0 0 0 1 2 2 2 2 3 2 0 min - - - - 0.013 0.170 0.500 0.690 0.460 0.120 <0.01 - max - - - - 0.013 0.230 0.810 1.700 0.490 0.330 0.073 - med - - - - 0.013 0.200 0.655 1.195 0.475 0.270 0.039 - DOrgN (mg.L-1) n 0 0 0 0 1 2 2 2 1 3 2 0 min - - - - 0.60 0.42 0.60 0.48 0.43 0.33 0.39 - max - - - - 0.60 0.68 0.69 0.61 0.43 0.47 0.47 - med - - - - 0.60 0.55 0.65 0.55 0.43 0.41 0.43 - TP (mg.L-1) n 0 0 0 0 1 2 2 2 2 3 2 0 min - - - - 0.050 0.068 0.028 0.030 0.013 0.018 0.028 - max - - - - 0.050 0.078 0.051 0.031 0.029 0.046 0.036 - med - - - - 0.050 0.073 0.040 0.031 0.021 0.029 0.032 - FRP (mg.L-1) n 0 0 0 0 1 2 2 2 2 3 2 0 min - - - - 0.025 0.027 0.016 0.015 0.013 0.008 0.006 - max - - - - 0.025 0.034 0.033 0.020 0.015 0.027 0.011 - med - - - - 0.025 0.031 0.025 0.018 0.014 0.015 0.009 - DOC (mg.L-1) n 0 0 0 0 1 2 2 2 2 3 2 0 min - - - - 14 8 11 9 8 8 8 - max - - - - 14 12 12 10 8 9 10 - med - - - - 14 10 11.5 9.5 8 8 9 - TSS (mg.L-1) n 0 0 0 0 1 2 2 2 2 3 2 0 min - - - - <1 5 1 2 <1 1 5 - max - - - - <1 8 2 3 1 2 8 - med - - - - <1 6.5 1.5 2.5 0.75 1 6.5 -
Department of Water and Environmental Regulation 75 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 0 0 0 0 1 2 2 2 2 3 2 0 min - - - - 4.81 5.06 6.69 7.73 8.76 8.00 7.59 - max - - - - 4.81 5.66 7.20 8.45 10.09 8.50 8.22 - med - - - - 4.81 5.36 6.95 8.09 9.43 8.38 7.91 - Sp. Conductivity (mS.cm-1) n 0 0 0 0 1 2 2 2 2 3 2 0 min - - - - 1.152 0.722 1.081 0.899 0.868 1.108 1.552 - max - - - - 1.152 0.779 1.445 1.115 1.305 1.408 1.624 - med - - - - 1.152 0.751 1.263 1.007 1.087 1.331 1.588 -
Please note there is no hydrograph for this catchment as it is not gauged. The 2018 data collected from Blackadder Creek generally followed the previous five years of background data. Total nitrogen displayed a seasonal response to rainfall, with the highest concentrations recorded during winter and early spring and this is largely due to a similar pattern in the concentration of total oxidised nitrogen in the catchment.
76 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
7 Bull Creek (SCCIS2)
2.0
SCCIS2 (BULL CK) TN 2013-2017 data 2018 data
1.5 ) -1
1.0 TN(mg L
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 65 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS2 (Bull Ck).
0.25
SCCIS2 (BULL CK) NH3-N
2013-2017 data 0.20 2018 data )
-1 0.15 -N(mg L 3 0.10 NH
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
+ -1 Figure 66 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS2 (Bull Ck).
Department of Water and Environmental Regulation 77 Swan Canning Catchment Data Report January - December 2018
0.4 SCCIS2 (BULL CK) NOx-N
2013-2017 data 2018 data 0.3 ) -1
0.2 NOx-N(mg L
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 67 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS2 (Bull Ck).
1.4 SCCIS2 (BULL CK) DOrgN 2013-2017 data 2018 data 1.2
1.0 ) -1 0.8
0.6 DOrgN(mg L
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 68 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS2 (Bull Ck).
78 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
The 90th Percentile for Mar was 0.56 mg.L-1 0.4 SCCIS2 (BULL CK) TP
2013-2017 data 2018 data 0.3 ) -1
0.2 TP(mg L
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 69 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS2 (Bull Ck).
The 90th Percentile for Mar was 0.38 mg.L-1 0.10 SCCIS2 (BULL CK) FRP
2013-2017 data 0.08 2018 data
) 0.06 -1
FRP(mg L 0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 70 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS2 (Bull Ck).
Department of Water and Environmental Regulation 79 Swan Canning Catchment Data Report January - December 2018
35 SCCIS2 (BULL CK) DOC 2013-2017 data 30 2018 data
25 ) -1 20
15 DOC(mg L
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 71 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS2 (Bull Ck).
The 90th Percentile for The 90th Percentile for Apr was 55 mg.L-1 Aug was 70 mg.L-1 25 SCCIS2 (BULL CK) TSS 2013-2017 data 2018 data
20
) 15 -1
TSS(mg L 10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=11 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 72 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS2 (Bull Ck).
80 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
12
SCCIS2 (BULL CK) DO 2013-2017 data 2018 data 10
8 ) -1
6 DO(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 73 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS2 (Bull Ck).
1.2 SCCIS2 (BULL CK) Sp. Conductivity 2013-2017 data 2018 data 1.0
) 0.8 -1
0.6
Sp.Cond (mS cm 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 74 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS2 (Bull Ck).
Department of Water and Environmental Regulation 81 Swan Canning Catchment Data Report January - December 2018
Table 10 2018 monthly sample numbers, minimum and maximum values at SCCIS2 (Bull Ck).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.81 0.70 0.66 0.70 0.74 0.22 0.88 0.83 1.10 1.10 0.88 0.73 max 0.92 0.75 0.72 0.86 0.86 0.58 1.10 1.30 1.30 1.10 1.00 0.76 med 0.92 0.73 0.69 0.78 0.80 0.40 0.99 0.94 1.20 1.10 0.94 0.75
-1 NH3-N (mg.L ) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.069 0.051 0.032 0.041 0.071 0.023 0.140 0.082 0.170 0.180 0.079 0.048 max 0.100 0.061 0.041 0.140 0.100 0.074 0.190 0.250 0.290 0.230 0.150 0.069 med 0.095 0.056 0.037 0.091 0.086 0.049 0.165 0.170 0.230 0.205 0.115 0.059
-1 NOx-N (mg.L ) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.048 0.046 0.034 0.023 0.091 0.027 0.150 0.200 0.210 0.100 0.078 0.037 max 0.110 0.054 0.038 0.110 0.110 0.100 0.290 0.440 0.270 0.240 0.100 0.052 med 0.050 0.050 0.036 0.067 0.101 0.064 0.220 0.260 0.240 0.170 0.089 0.045 DOrgN (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.64 0.56 0.56 0.60 0.57 0.17 0.37 0.35 0.62 0.17 0.64 0.61 max 0.66 0.59 0.62 0.62 0.59 0.21 0.51 0.64 0.69 0.66 0.66 0.64 med 0.64 0.58 0.59 0.61 0.58 0.19 0.44 0.45 0.66 0.42 0.65 0.63 TP (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.072 0.064 0.052 0.059 0.061 0.043 0.069 0.052 0.054 0.056 0.049 0.055 max 0.089 0.067 0.056 0.063 0.070 0.057 0.086 0.084 0.067 0.064 0.064 0.061 med 0.080 0.066 0.054 0.061 0.066 0.050 0.078 0.056 0.061 0.060 0.057 0.058 FRP (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.042 0.032 0.033 0.042 0.039 0.015 0.032 0.022 0.032 0.031 0.030 0.039 max 0.047 0.033 0.041 0.047 0.047 0.019 0.039 0.032 0.036 0.041 0.032 0.042 med 0.045 0.033 0.037 0.045 0.043 0.017 0.036 0.026 0.034 0.036 0.031 0.041 DOC (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 18 18 18 19 20 3 11 9 21 20 18 20 max 21 20 20 20 20 9 18 18 21 21 21 21 med 20 19 19 19.5 20 6 14.5 12 21 20.5 19.5 20.5 TSS (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 4 2 2 3 3 3 4 2 3 4 3 2 max 7 4 3 3 4 6 16 17 3 7 7 3 med 7 3 2.5 3 3.5 4.5 10 4 3 5.5 5 2.5
82 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 3.76 5.53 3.39 4.09 5.76 8.51 8.37 8.80 8.43 8.27 7.89 6.57 max 6.28 5.68 4.96 4.83 6.64 9.72 8.98 9.40 8.64 8.32 8.26 7.90 med 6.00 5.61 4.18 4.46 6.20 9.12 8.68 9.27 8.54 8.30 8.08 7.24 Sp. Conductivity (mS.cm-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.474 0.711 0.715 0.701 0.729 0.284 0.364 0.306 0.624 0.647 0.667 0.696 max 0.736 0.728 0.721 0.713 0.735 0.850 0.627 0.555 0.673 0.649 0.687 0.700 med 0.719 0.720 0.718 0.707 0.732 0.567 0.496 0.350 0.649 0.648 0.677 0.698
Please note this is an ungauged catchment. The 2018 Bull Creek (Modillion Avenue drain) data generally followed the background data except for slightly elevated total nitrogen concentrations during spring and elevated ammoniacal nitrogen concentrations through the second part of the year; although variability in the ammoniacal nitrogen data is normally relatively high the absolute values are not particularly high during 2018, even though they exceed the background data.
Department of Water and Environmental Regulation 83 Swan Canning Catchment Data Report January - December 2018
8 Bull Creek (BAMDKD)
2.0 BAMDKD (BULL CK) TN
1.5 ) -1
1.0 TN(mg L
0.5
2013-2017 data 2018 data
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=11 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 75 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site BAMDKD (Bull Ck).
0.25 BAMDKD (BULL CK) NH -N 3 2013-2017 data 2018 data
0.20 )
-1 0.15 -N(mg L 3 0.10 NH
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=11 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
+ -1 Figure 76 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site BAMDKD (Bull Ck).
84 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
1.0
BAMDKD (BULL CK) NOx-N 2013-2017 data 2018 data
0.8 )
-1 0.6
0.4 NOx-N(mg L
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=11 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 77 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at BAMDKD (Bull Ck).
1.4 BAMDKD (BULL CK) DOrgN
1.2 2013-2017 data 2018 data
1.0 ) -1 0.8
0.6 DOrgN(mg L
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=11 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 78 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at BAMDKD (Bull Ck).
Department of Water and Environmental Regulation 85 Swan Canning Catchment Data Report January - December 2018
0.5 BAMDKD (BULL CK) TP 2013-2017 data 2018 data
0.4
) 0.3 -1
TP(mg L 0.2
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=11 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 79 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site BAMDKD (Bull Ck).
0.30 BAMDKD (BULL CK) FRP 2013-2017 data 2018 data 0.25
0.20 ) -1
0.15 FRP(mg L
0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=11 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 80 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at BAMDKD (Bull Ck).
86 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
30 BAMDKD (BULL CK) DOC 2013-2017 data 2018 data 25
20 ) -1
15 DOC(mg L
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=11 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 81 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at BAMDKD (Bull Ck).
40 BAMDKD (BULL CK) TSS
2013-2017 data 2018 data 30 ) -1
20 TSS(mg L
10
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=11 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 82 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site BAMDKD (Bull Ck).
Department of Water and Environmental Regulation 87 Swan Canning Catchment Data Report January - December 2018
12 BAMDKD (BULL CK) DO 2013-2017 data 2018 data 10
8 ) -1
6 DO(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=11 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 83 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site BAMDKD (Bull Ck).
1.2
BAMDKD (BULL CK) Sp. Conductivity 2013-2017 data 2018 data 1.0
) 0.8 -1
0.6
Sp.Cond (mS cm 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=11 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 84 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site BAMDKD (Bull Ck).
88 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 11 2018 monthly sample numbers, minimum and maximum values at BAMDKD (Bull Ck).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.81 0.66 0.60 0.62 0.61 0.25 1.00 0.48 1.20 1.00 0.90 0.91 max 1.20 0.80 0.74 0.89 0.65 0.49 1.40 1.60 1.20 1.10 1.80 0.98 med 0.99 0.73 0.67 0.76 0.63 0.37 1.20 0.66 1.20 1.05 1.35 0.95
-1 NH3-N (mg.L ) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.024 0.036 0.030 0.019 0.040 0.021 0.036 0.033 0.039 0.034 0.039 0.074 max 0.095 0.037 0.046 0.039 0.044 0.021 0.038 0.040 0.049 0.044 0.051 0.090 med 0.052 0.037 0.038 0.029 0.042 0.021 0.037 0.039 0.044 0.039 0.045 0.082
-1 NOx-N (mg.L ) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.020 0.038 0.032 <0.01 0.013 0.033 0.340 0.130 0.250 0.180 0.120 0.100 max 0.150 0.043 0.033 0.036 0.020 0.120 0.540 0.670 0.320 0.260 0.140 0.110 med 0.076 0.041 0.033 0.021 0.017 0.077 0.440 0.250 0.285 0.220 0.130 0.105 DOrgN (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.72 0.58 0.53 0.54 0.54 0.18 0.57 0.25 0.79 0.32 0.68 0.68 max 0.91 0.62 0.66 0.77 0.54 0.20 0.79 0.87 0.88 0.73 0.71 0.73 med 0.72 0.60 0.60 0.66 0.54 0.19 0.68 0.37 0.84 0.53 0.70 0.71 TP (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.120 0.077 0.062 0.110 0.076 0.046 0.064 0.055 0.072 0.076 0.061 0.110 max 0.150 0.100 0.099 0.540 0.091 0.067 0.075 0.077 0.075 0.078 0.350 0.110 med 0.130 0.089 0.081 0.325 0.084 0.057 0.070 0.075 0.074 0.077 0.206 0.110 FRP (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.087 0.054 0.059 0.096 0.047 0.019 0.042 0.025 0.048 0.047 0.046 0.075 max 0.096 0.082 0.067 0.420 0.059 0.030 0.049 0.043 0.052 0.061 0.052 0.077 med 0.093 0.068 0.063 0.258 0.053 0.025 0.046 0.032 0.050 0.054 0.049 0.076 DOC (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 20 16 17 16 17 3 16 6 22 21 17 19 max 22 19 19 22 17 9 22 22 22 22 19 19 med 20 17.5 18 19 17 6 19 11 22 21.5 18 19 TSS (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 1 <1 <1 <1 <1 <1 <1 <1 <1 <1 2 <1 max 11 <1 1 8 1 2 2 15 5 2 49 2 med 2 <1 0.75 4.25 0.75 1.25 1.25 0.5 2.75 1.25 25.5 1.25
Department of Water and Environmental Regulation 89 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 2.63 4.51 2.82 0.84 3.95 7.06 7.40 8.35 7.86 8.14 6.10 4.99 max 4.98 4.54 3.49 4.37 4.07 9.56 7.87 9.49 8.47 8.44 7.63 6.44 med 4.04 4.53 3.16 2.61 4.01 8.31 7.64 9.39 8.17 8.29 6.87 5.72 Sp. Conductivity (mS.cm-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.456 0.681 0.665 0.527 0.659 0.276 0.563 0.174 0.687 0.634 0.677 0.657 max 0.694 0.685 0.714 0.671 0.661 0.570 0.744 0.639 0.715 0.681 0.678 0.672 med 0.686 0.683 0.690 0.599 0.660 0.423 0.654 0.309 0.701 0.658 0.678 0.665
There is no hydrograph as this catchment is ungauged. The 2018 data for the Beatrice Avenue Main Drain catchment largely followed what is relatively variable background data. Total nitrogen and dissolved organic nitrogen concentrations were unusually variable during winter (showing the close relationship between the two parameters) during 2018. While there was a seasonal response in total oxidised nitrogen concentrations during winter, it was not as pronounced as normal. The was a notable spike in total phosphorus concentrations in April, largely due to a corresponding spike in filterable reactive phosphorus concentrations; largely due to 11th April sample. No field notes or recent rainfall explain why this may have happened so it can only be assumed there was an input of soluble phosphorus in the catchment. A second, slightly lower spike in total phosphorus in November coincided with a spike in total suspended solids, due to 21st November sample; field notes mention particulates in the water column which could explain the data collected at the site.
90 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
9 Canning River (SWS12)
1.4 SWS12 (CANNING) TN 2013-2017 data 2018 data 1.2
1.0 )
-1 0.8
0.6 TN(mg L
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 85 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS12 (Canning R).
0.12
SWS12 (CANNING) NH3-N 2013-2017 data 2018 data 0.10
0.08 ) -1
0.06 -N(mg L 3 NH 0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
+ -1 Figure 86 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS12 (Canning R).
Department of Water and Environmental Regulation 91 Swan Canning Catchment Data Report January - December 2018
1.0 SWS12 (CANNING) NOx-N
2013-2017 data 0.8 2018 data )
-1 0.6
0.4 NOx-N(mg L
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 87 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS12 (Canning R).
0.8
SWS12 (CANNING) DOrgN 2013-2017 data 2018 data
0.6 ) -1
0.4 DOrgN(mg L
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 88 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS12 (Canning R).
92 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
0.10 SWS12 (CANNING) TP 2013-2017 data 2018 data
0.08
) 0.06 -1
TP(mg L 0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 89 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS12 (Canning R).
0.030
SWS12 (CANNING) FRP 2013-2017 data 2018 data 0.025
0.020 ) -1
0.015 FRP(mg L
0.010
0.005
0.000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 90 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS12 (Canning R).
Department of Water and Environmental Regulation 93 Swan Canning Catchment Data Report January - December 2018
12 SWS12 (CANNING) DOC 2013-2017 data 2018 data 10
8 ) -1
6 DOC(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 91 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS12 (Canning R).
The 90th Percentile for Aug was 57 mg.L-1 25 SWS12 (CANNING) TSS
2013-2017 data 20 2018 data
) 15 -1
TSS(mg L 10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 92 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS12 (Canning R).
94 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
12 SWS12 (CANNING) DO
10 2013-2017 data 2018 data
8 ) -1
6 D O ( m g L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 93 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS12 (Canning).
The 90th Percentile for Apr was 2.76 mS.cm-1 1.4 SWS12 (CANNING) Sp. Conductivity
1.2 2013-2017 data 2018 data
1.0 ) -1
0.8
0.6 Sp.Cond (mS cm
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 94 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS12 (Canning R).
Department of Water and Environmental Regulation 95 Swan Canning Catchment Data Report January - December 2018
Canning River (SWS12) 2018 flow 450 400 350 300 250 200 150
Daily discharge (ML) discharge Daily 100 50 0
Date
Figure 95 2018 Canning River flow (616027) – Daily discharge hydrograph measured in megalitres.
96 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 12 2018 monthly sample numbers, minimum and maximum values at SWS12 (Canning R).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.21 0.23 0.18 0.21 0.18 0.55 0.75 0.85 0.69 0.33 0.30 0.30 max 0.41 0.26 0.23 0.31 0.37 0.88 1.20 1.20 1.40 0.45 0.35 0.31 med 0.31 0.25 0.21 0.26 0.22 0.72 0.98 1.03 1.05 0.40 0.33 0.31
-1 NH3-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.024 0.020 0.032 0.026 0.021 0.017 0.029 0.027 0.012 0.021 0.017 0.022 max 0.041 0.022 0.037 0.034 0.030 0.029 0.030 0.034 0.025 0.028 0.031 0.032 med 0.033 0.021 0.035 0.030 0.022 0.023 0.030 0.031 0.019 0.025 0.024 0.027
-1 NOx-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min <0.01 <0.01 0.016 0.035 0.030 0.140 0.530 0.610 0.350 0.140 0.110 0.089 max 0.082 0.019 0.031 0.040 0.090 0.410 0.700 0.850 0.440 0.270 0.140 0.094 med 0.044 0.012 0.024 0.038 0.042 0.275 0.615 0.730 0.395 0.200 0.125 0.092 DOrgN (mg.L-1) n 2 2 2 2 3 2 2 2 1 3 2 2 min 0.18 0.19 0.10 0.13 0.11 0.25 0.19 0.19 0.21 0.12 0.15 0.15 max 0.27 0.19 0.16 0.24 0.22 0.40 0.31 0.22 0.21 0.19 0.17 0.18 med 0.23 0.19 0.13 0.19 0.13 0.33 0.25 0.21 0.21 0.14 0.16 0.17 TP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.014 0.014 0.016 0.009 0.008 0.018 0.006 0.018 <0.005 <0.005 0.015 0.015 max 0.020 0.014 0.018 0.013 0.016 0.060 0.028 0.020 0.017 0.018 0.022 0.016 med 0.017 0.014 0.017 0.011 0.013 0.039 0.017 0.019 0.010 0.008 0.019 0.016 FRP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min <0.005 <0.005 0.006 0.006 <0.005 0.009 0.006 <0.005 <0.005 <0.005 0.005 0.006 max <0.005 <0.005 0.013 0.006 0.012 0.014 0.009 0.008 <0.005 <0.005 0.014 0.011 med <0.005 <0.005 0.010 0.006 0.010 0.012 0.008 0.005 <0.005 <0.005 0.010 0.009 DOC (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 4 3 3 3 2 4 4 4 3 3 3 3 max 5 4 3 3 4 6 6 4 3 3 3 3 med 4.5 3.5 3 3 3 5 5 4 3 3 3 3 TSS (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 1 1 <1 2 <1 2 2 5 1 <1 <1 <1 max 2 2 2 2 1 16 8 8 5 3 1 2 med 1.5 1.5 1.25 2 1 9 5 6.5 3 0.5 0.75 1.25
Department of Water and Environmental Regulation 97 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 3.91 3.79 3.27 4.14 6.53 8.59 9.30 9.21 9.28 7.00 6.37 5.65 max 4.24 4.41 4.37 5.73 7.56 8.94 9.50 9.27 9.58 8.58 7.00 7.55 med 4.08 4.10 3.82 4.94 6.71 8.77 9.40 9.24 9.43 7.98 6.69 6.60 Sp. Conductivity (mS.cm-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.681 0.675 0.742 0.680 0.674 0.227 0.485 0.474 0.494 0.527 0.657 0.604 max 0.711 0.687 0.748 0.727 0.714 0.531 0.552 0.478 0.566 0.664 0.742 0.699 med 0.696 0.681 0.745 0.704 0.699 0.379 0.519 0.476 0.530 0.579 0.700 0.652
The 2018 Canning River data was very similar to the background 5 years of data and nutrient concentrations are generally relatively low. The hydrograph shows a storm flow in January in response to the heavy rain Perth received on 16th Jan, but this didn’t seem to impact any of the measured parameters. This is probably because the rain event and high flow was missed by the routine sampling which didn’t occur until 8 days later on 24th January 2018. Total nitrogen and total oxidised nitrogen showed a typical response to rainfall and surface run off during winter and spring, but on the whole the 2018 data was similar to the background data.
98 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
10 Claise Brook (CB13)
3.0 CB13 (CLAISE BK) TN
2013-2017 data 2.5 2018 data
2.0 ) -1
1.5 TN(mg L
1.0
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=6 n=9 n=11 n=10 n=10 n=10 n=11 n=10 n=11 n=9 n=10
Figure 96 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CB13 (Claise Bk).
The 90th Percentile for Oct was 0.71 mg.L-1 0.6
CB13 (CLAISE BK) NH3-N
2013-2017 data 0.5 2018 data
0.4 ) -1
0.3 -N(mg L 3 NH 0.2
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=6 n=9 n=11 n=10 n=10 n=10 n=11 n=10 n=11 n=9 n=10
+ -1 Figure 97 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CB13 (Claise Bk).
Department of Water and Environmental Regulation 99 Swan Canning Catchment Data Report January - December 2018
1.4 CB13 (CLAISE BK) NOx-N
1.2 2013-2017 data 2018 data
1.0 ) -1 0.8
0.6 NOx-N(mg L
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=6 n=9 n=11 n=10 n=10 n=10 n=11 n=10 n=11 n=9 n=10
Figure 98 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CB13 (Claise Bk).
1.2 CB13 (CLAISE BK) DOrgN
1.0 2013-2017 data 2018 data
0.8 ) -1
0.6 DOrgN(mg L 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=6 n=9 n=11 n=10 n=9 n=10 n=11 n=10 n=11 n=9 n=10
Figure 99 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CB13 (Claise Bk).
100 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
0.14 CB13 (CLAISE BK) TP 2013-2017 data 2018 data 0.12
0.10 )
-1 0.08
0.06 TP(mg L
0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=6 n=9 n=11 n=10 n=10 n=10 n=11 n=10 n=11 n=9 n=10
Figure 100 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CB13 (Claise Bk).
0.05
CB13 (CLAISE BK) FRP 2013-2017 data 2018 data
0.04
) 0.03 -1
FRP(mg L 0.02
0.01
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=6 n=9 n=11 n=10 n=10 n=10 n=11 n=10 n=11 n=9 n=10
Figure 101 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CB13 (Claise Bk).
Department of Water and Environmental Regulation 101 Swan Canning Catchment Data Report January - December 2018
16 CB13 (CLAISE BK) DOC 14 2013-2017 data 2018 data 12
10 ) -1
8 DOC(mg L 6
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=6 n=9 n=11 n=10 n=10 n=10 n=11 n=10 n=11 n=9 n=10
Figure 102 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CB13 (Claise Bk).
18 CB13 (CLAISE BK) TSS 16 2013-2017 data 2018 data 14
12 ) -1 10
8 TSS(mg L
6
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=6 n=9 n=11 n=10 n=10 n=10 n=11 n=10 n=11 n=9 n=10
Figure 103 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CB13 (Claise Bk).
102 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
18 CB13 (CLAISE BK) DO 16
14
12 ) -1 10
8 DO(mg L
6
4
2 2013-2017 data 2018 data
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=8 n=6 n=9 n=11 n=10 n=10 n=10 n=11 n=10 n=11 n=9 n=10
Figure 104 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CB13 (Claise Bk).
1.4 CB13 (CLAISE BK) Sp. Conductivity 2013-2017 data 2018 data 1.2
1.0 ) -1
0.8
0.6 Sp.Cond (mS cm
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=8 n=6 n=9 n=11 n=10 n=10 n=10 n=11 n=10 n=11 n=9 n=10
Figure 105 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CB13 (Claise Bk).
Department of Water and Environmental Regulation 103 Swan Canning Catchment Data Report January - December 2018
Table 13 2018 monthly sample numbers, minimum and maximum values at CB13 (Claise Bk).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 3 2 2 2 2 2 2 3 1 2 2 1 min 0.66 0.62 0.98 0.99 1.10 0.79 0.88 0.83 1.40 0.97 0.90 0.89 max 0.88 1.10 2.30 1.10 1.20 1.10 1.50 1.10 1.40 1.00 0.93 0.89 med 0.84 0.86 1.64 1.05 1.15 0.95 1.19 0.85 1.40 0.99 0.92 0.89
-1 NH3-N (mg.L ) n 3 2 2 2 2 2 2 3 1 2 2 1 min 0.042 0.040 0.190 0.100 0.089 0.097 0.095 0.064 0.100 0.045 0.026 0.039 max 0.077 0.071 0.260 0.110 0.130 0.160 0.180 0.100 0.100 0.066 0.066 0.039 med 0.049 0.056 0.225 0.105 0.110 0.129 0.138 0.070 0.100 0.056 0.046 0.039
-1 NOx-N (mg.L ) n 3 2 2 2 2 2 2 3 1 2 2 1 min 0.220 0.250 0.590 0.710 0.710 0.370 0.630 0.490 1.000 0.580 0.470 0.460 max 0.440 0.690 0.730 0.730 0.850 0.630 0.900 0.720 1.000 0.610 0.520 0.460 med 0.430 0.470 0.660 0.720 0.780 0.500 0.765 0.660 1.000 0.595 0.495 0.460 DOrgN (mg.L-1) n 3 2 2 2 2 2 2 3 1 2 2 1 min 0.26 0.06 0.17 0.16 0.11 0.08 0.14 0.06 0.19 0.24 0.34 0.30 max 0.30 0.26 1.10 0.26 0.24 0.24 0.28 0.26 0.19 0.28 0.35 0.30 med 0.26 0.16 0.64 0.21 0.18 0.16 0.21 0.25 0.19 0.26 0.35 0.30 TP (mg.L-1) n 3 2 2 2 2 2 2 3 1 2 2 1 min 0.032 0.032 0.055 0.041 0.037 0.057 0.050 0.037 0.046 0.030 0.030 0.037 max 0.052 0.046 0.180 0.049 0.048 0.058 0.067 0.048 0.046 0.045 0.041 0.037 med 0.047 0.039 0.118 0.045 0.043 0.058 0.059 0.040 0.046 0.038 0.036 0.037 FRP (mg.L-1) n 3 2 2 2 2 2 2 3 1 2 2 1 min 0.007 <0.005 0.017 0.010 0.015 0.014 0.025 0.014 0.011 0.017 0.010 0.006 max 0.015 0.006 0.050 0.021 0.015 0.021 0.027 0.021 0.011 0.019 0.011 0.006 med 0.009 0.004 0.034 0.016 0.015 0.018 0.026 0.021 0.011 0.018 0.011 0.006 DOC (mg.L-1) n 3 2 2 2 2 2 2 3 1 2 2 1 min 6 5 6 6 5 4 4 6 8 8 7 7 max 6 6 23 7 5 6 6 7 8 8 7 7 med 6 5.5 14.5 6.5 5 5 5 6 8 8 7 7 TSS (mg.L-1) n 3 2 2 2 2 2 2 3 1 2 2 1 min 4 6 4 4 4 5 5 2 6 3 3 8 max 8 6 15 5 5 8 6 3 6 8 11 8 med 7 6 9.5 4.5 4.5 6.5 5.5 3 6 5.5 7 8
104 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 3 2 2 2 2 2 2 3 1 2 2 1 min 5.56 10.73 6.38 8.98 9.77 8.80 9.18 9.45 11.70 11.90 15.02 10.66 max 5.81 14.30 8.11 10.10 10.67 9.06 9.53 10.32 11.70 12.04 16.62 10.66 med 5.69 12.52 7.25 9.54 10.22 8.93 9.36 9.62 11.70 11.97 15.82 10.66 Sp. Conductivity (mS.cm-1) n 3 2 2 2 2 2 2 3 1 2 2 1 min 0.467 0.730 0.751 0.744 0.754 0.356 0.495 0.556 0.766 0.622 0.742 0.773 max 0.751 0.778 0.837 0.772 0.770 0.593 0.715 0.617 0.766 0.738 0.770 0.773 med 0.748 0.754 0.794 0.758 0.762 0.475 0.605 0.564 0.766 0.680 0.756 0.773
Claise Brook Main Drain is ungauged. The 2018 Claise Brook data generally followed the background data with the exception of a spike in March of the concentrations of several parameters including total nitrogen, dissolved organic nitrogen, total phosphorus, filterable reactive phosphorus, dissolved organic carbon, and total suspended solids. This is mostly due to the sample collected on 14th March 2018, but there are no field comments that might help explain this occurrence nor was there any rainfall prior to or during sampling. The elevated total suspended solids might help explain some of the increased nutrient concentrations, in particulate form, but it doesn’t explain the unusually high concentrations of the soluble nutrients recorded in this sample. Given the time of year and the nature of the site it is possible there was an algal bloom in the lake which field samplers didn’t notice due to the frequency of such events. The remaining, less notable, variation from the background data was most likely attributable to natural variability of measured parameters in the water, as the background data for Claise Brook is quite variable in terms of water quality and particularly so for certain parameters, e.g. nitrogen as ammonia/ammonium and total oxidised nitrogen.
Department of Water and Environmental Regulation 105 Swan Canning Catchment Data Report January - December 2018
11 Ellen Brook (SWN3)
5 SWN3 (ELLEN BK) TN
4
) 3 -1
TN (mgL 2
1
2013-2017 data 2018 data
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=1 n=0 n=0 n=2 n=7 n=11 n=10 n=10 n=10 n=7 n=1
Figure 106 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN3 (Ellen Bk).
0.35
SWN3 (ELLEN BK) NH3-N
0.30 2013-2017 data 2018 data
0.25 ) -1 0.20 -N(mg L
3 0.15 NH
0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=1 n=0 n=0 n=2 n=7 n=11 n=10 n=10 n=10 n=7 n=1
+ -1 Figure 107 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN3 (Ellen Bk).
106 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
0.20 SWN3 (ELLEN BK) NOx-N 2013-2017 data 2018 data
0.15 ) -1
0.10 NOx-N(mg L
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=1 n=0 n=0 n=2 n=7 n=11 n=10 n=10 n=10 n=7 n=1
Figure 108 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN3 (Ellen Bk).
4 SWN3 (ELLEN BK) DOrgN
3 ) -1
2 DOrgN(mg L
1
2013-2017 data 2018 data
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=1 n=0 n=0 n=2 n=7 n=11 n=10 n=10 n=10 n=7 n=1
Figure 109 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN3 (Ellen Bk).
Department of Water and Environmental Regulation 107 Swan Canning Catchment Data Report January - December 2018
1.4
SWN3 (ELLEN BK) TP 2013-2017 data 2018 data 1.2
1.0 )
-1 0.8
0.6 TP(mg L
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=1 n=0 n=0 n=2 n=7 n=11 n=10 n=10 n=10 n=7 n=1
Figure 110 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN3 (Ellen Bk).
1.0 SWN3 (ELLEN BK) FRP 2013-2017 data 2018 data
0.8
) 0.6 -1
FRP(mg L 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=1 n=0 n=0 n=2 n=7 n=11 n=10 n=10 n=10 n=7 n=1
Figure 111 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN3 (Ellen Bk).
108 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
100 SWN3 (ELLEN BK) DOC 2013-2017 data 2018 data
80
) 60 -1
DOC(mg L 40
20
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=1 n=0 n=0 n=2 n=7 n=11 n=10 n=10 n=10 n=7 n=1
Figure 112 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN3 (Ellen Bk).
50 SWN3 (ELLEN BK) TSS
2013-2017 data 40 2018 data
) 30 -1
TSS(mg L 20
10
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=1 n=0 n=0 n=2 n=7 n=11 n=10 n=10 n=10 n=7 n=1
Figure 113 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN3 (Ellen Bk).
Department of Water and Environmental Regulation 109 Swan Canning Catchment Data Report January - December 2018
12 SWN3 (ELLEN BK) DO
2013-2017 data 10 2018 data
8 ) -1
6 DO(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=1 n=0 n=0 n=2 n=7 n=11 n=10 n=10 n=10 n=7 n=1
Figure 114 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN3 (Ellen Bk).
4 SWN3 (ELLEN BK) Sp. Conductivity 2013-2017 data 2018 data
3 ) -1
2 Sp.Cond (mS cm
1
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=1 n=0 n=0 n=2 n=7 n=11 n=10 n=10 n=10 n=7 n=1
Figure 115 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN3 (Ellen Bk).
110 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Ellen Bk (SWN3) 2018 flow 1600
1400
1200
1000
800
600
Daily discharge (ML) Daily discharge 400
200
0
Date
Figure 116 2018 Ellen Bk flow (616189) – Daily discharge hydrograph measured in megalitres.
The 2018 hydrograph didn’t register the rain event on 16th January 2018 and given the fact the site wasn’t flowing a week later it appears the rain event didn’t provide sufficient run off in what is a very large catchment to generate flow at the gauging station.
Department of Water and Environmental Regulation 111 Swan Canning Catchment Data Report January - December 2018
Table 14 2018 monthly sample numbers, minimum and maximum values at SWN3 (Ellen Bk).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 0 0 0 0 0 2 2 2 2 3 2 0 min - - - - - 2.20 2.50 3.00 3.00 2.00 1.90 - max - - - - - 2.70 3.10 3.10 3.50 3.00 2.40 - med - - - - - 2.45 2.80 3.05 3.25 2.10 2.15 -
-1 NH3-N (mg.L ) n 0 0 0 0 0 2 2 2 2 3 2 0 min - - - - - 0.044 0.056 0.072 0.060 0.049 0.020 - max - - - - - 0.064 0.070 0.078 0.074 0.061 0.038 - med - - - - - 0.054 0.063 0.075 0.067 0.060 0.029 -
-1 NOx-N (mg.L ) n 0 0 0 0 0 2 2 2 2 3 2 0 min - - - - - 0.023 0.130 0.140 0.092 0.055 <0.01 - max - - - - - 0.290 0.150 0.150 0.130 0.085 0.011 - med - - - - - 0.157 0.140 0.145 0.111 0.069 0.008 - DOrgN (mg.L-1) n 0 0 0 0 0 2 2 2 1 3 2 0 min - - - - - 1.90 2.20 2.60 2.70 1.80 1.70 - max - - - - - 1.90 2.90 2.80 2.70 2.70 1.80 - med - - - - - 1.90 2.55 2.70 2.70 1.90 1.75 - TP (mg.L-1) n 0 0 0 0 0 2 2 2 2 3 2 0 min - - - - - 0.22 0.34 0.57 0.45 0.40 0.54 - max - - - - - 0.40 0.39 0.62 0.64 0.48 0.83 - med - - - - - 0.31 0.37 0.60 0.55 0.44 0.69 - FRP (mg.L-1) n 0 0 0 0 0 2 2 2 2 3 2 0 min - - - - - 0.16 0.23 0.41 0.39 0.31 0.43 - max - - - - - 0.18 0.26 0.54 0.46 0.39 0.49 - med - - - - - 0.17 0.25 0.48 0.43 0.34 0.46 - DOC (mg.L-1) n 0 0 0 0 0 2 2 2 2 3 2 0 min - - - - - 37 49 54 59 49 41 - max - - - - - 43 55 63 61 60 47 - med - - - - - 40 52 58.5 60 49 44 - TSS (mg.L-1) n 0 0 0 0 0 2 2 2 2 3 2 0 min - - - - - 11 6 5 4 5 7 - max - - - - - 24 7 6 8 11 9 - med - - - - - 17.5 6.5 5.5 6 5 8 -
112 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 0 0 0 0 0 2 2 2 2 3 2 0 min - - - - - 7.27 7.76 8.27 8.49 5.22 5.57 - max - - - - - 7.28 8.05 8.47 8.58 6.96 6.23 - med - - - - - 7.28 7.91 8.37 8.54 6.94 5.90 - Sp. Conductivity (mS.cm-1) n 0 0 0 0 0 2 2 2 2 3 2 0 min - - - - - 2.107 1.440 0.964 1.099 1.725 2.205 - max - - - - - 2.302 1.980 1.304 1.504 1.924 2.608 - med - - - - - 2.205 1.710 1.134 1.302 1.871 2.407 -
The 2018 data from Ellen Brook generally fell within the range of background data except for elevated total oxidised nitrogen from the onset of flow throughout winter. This elevated total oxidised nitrogen had no effect on total nitrogen as total oxidised nitrogen only contributes a small portion of total nitrogen in Ellen Brook catchment; the majority is made up of dissolved organic nitrogen.
Department of Water and Environmental Regulation 113 Swan Canning Catchment Data Report January - December 2018
12 Ellen Brook (West Swan Rd – SWN9)
5
SWN9 (ELLEN BK-WSR) TN 2013-2017 data 2018 data
4
) 3 -1
TN (mg L 2
1
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 117 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN9 (Ellen Bk -WSRd).
The 90th Percentile for Mar was 0.21 mg.L-1 0.14 SWN9 (ELLEN BK-WSR) NH3-N
0.12 2013-2017 data 2018 data
0.10 ) -1 0.08 -N(mg L
3 0.06 NH
0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
+ -1 Figure 118 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN9 (Ellen Bk - WSRd).
114 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
1.2 SWN9 (ELLEN BK-WSR) NOx-N 2013-2017 data 2018 data 1.0
0.8 ) -1
0.6 NOx-N(mg L 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 119 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN9 (Ellen Bk - WSRd).
3.5 SWN9 (ELLEN BK-WSR) DOrgN
3.0 2013-2017 data 2018 data
2.5 ) -1 2.0
1.5 DOrgN(mg L
1.0
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 120 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN9 (Ellen Bk - WSRd).
Department of Water and Environmental Regulation 115 Swan Canning Catchment Data Report January - December 2018
1.4 SWN9 (ELLEN BK-WSR) TP 2013-2017 data 2018 data 1.2
1.0 )
-1 0.8
0.6 TP(mg L
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 121 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN9 (Ellen Bk -WSRd).
0.8 SWN9 (ELLEN BK-WSR) FRP 2013-2017 data 2018 data
0.6 ) -1
0.4 FRP(mg L
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 122 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN9 (Ellen Bk - WSRd).
116 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
80 SWN9 (ELLEN BK-WSR) DOC
2013-2017 data 2018 data 60 ) -1
40 DOC(mg L
20
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 123 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN9 (Ellen Bk - WSRd).
30
SWN9 (ELLEN BK-WSR) TSS 2013-2017 data 2018 data 25
20 ) -1
15 TSS(mg L
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 124 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN9 (Ellen Bk -WSRd).
Department of Water and Environmental Regulation 117 Swan Canning Catchment Data Report January - December 2018
10 SWN9 (ELLEN BK-WSR) DO 2013-2017 data 2018 data
8
) 6 -1
DO(mg L 4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 125 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN9 (Ellen Bk -WSRd).
2.5 SWN9 (ELLEN BK-WSR) Sp. Conductivity 2013-2017 data 2018 data
2.0 ) -1 1.5
1.0 Sp.Cond (mS cm
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 126 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN9 (Ellen Bk -WSRd).
118 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 15 2018 monthly sample numbers, minimum and maximum values at SWN9 (Ellen Bk - WSRd).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 1.10 0.98 0.84 0.98 1.00 1.70 2.40 2.90 2.90 1.90 1.30 1.00 max 1.50 1.10 0.84 1.00 1.30 2.00 2.80 2.90 3.40 2.70 1.40 1.00 med 1.30 1.04 0.84 0.99 1.00 1.85 2.60 2.90 3.15 2.00 1.35 1.00
-1 NH3-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min <0.01 0.027 0.031 <0.01 0.023 0.031 0.041 0.066 0.054 0.037 0.012 <0.01 max 0.038 0.033 0.037 0.029 0.037 0.033 0.047 0.079 0.071 0.046 0.023 0.028 med 0.022 0.030 0.034 0.017 0.027 0.032 0.044 0.073 0.063 0.038 0.018 0.017
-1 NOx-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.028 0.049 0.035 0.074 0.260 0.260 0.190 0.170 0.170 0.200 0.240 0.120 max 0.180 0.120 0.040 0.094 0.350 0.350 0.310 0.260 0.280 0.300 0.290 0.140 med 0.104 0.085 0.038 0.084 0.270 0.305 0.250 0.215 0.225 0.270 0.265 0.130 DOrgN (mg.L-1) n 2 2 2 2 3 2 2 2 1 3 2 2 min 1.00 0.89 0.69 0.74 0.72 1.30 2.00 2.60 2.50 1.50 0.90 0.78 max 1.00 0.90 0.77 0.87 0.92 1.50 2.50 2.60 2.50 2.20 1.10 0.86 med 1.00 0.90 0.73 0.81 0.75 1.40 2.25 2.60 2.50 1.60 1.00 0.82 TP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.091 0.063 0.052 0.035 0.030 0.120 0.260 0.500 0.410 0.300 0.150 0.100 max 0.170 0.073 0.063 0.039 0.057 0.170 0.320 0.550 0.600 0.340 0.230 0.110 med 0.131 0.068 0.058 0.037 0.041 0.145 0.290 0.525 0.505 0.340 0.190 0.105 FRP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.049 0.036 0.034 0.013 0.021 0.086 0.180 0.360 0.350 0.250 0.091 0.060 max 0.110 0.046 0.035 0.023 0.036 0.100 0.200 0.460 0.420 0.260 0.190 0.060 med 0.080 0.041 0.035 0.018 0.022 0.093 0.190 0.410 0.385 0.250 0.141 0.060 DOC (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 24 22 17 22 20 29 45 54 56 40 25 22 max 27 23 18 23 26 34 50 58 57 52 30 24 med 25.5 22.5 17.5 22.5 20 31.5 47.5 56 56.5 43 27.5 23 TSS (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 5 3 2 1 1 4 2 5 4 4 7 6 max 27 7 3 3 4 4 6 6 9 5 11 10 med 16 5 2.5 2 2 4 4 5.5 6.5 5 9 8
Department of Water and Environmental Regulation 119 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 4.49 4.51 2.42 2.89 5.20 5.68 6.56 5.99 7.36 5.81 6.79 5.56 max 5.10 4.73 3.23 4.56 6.43 6.10 6.57 7.04 7.58 6.66 8.40 6.48 med 4.80 4.62 2.83 3.73 6.22 5.89 6.57 6.52 7.47 6.47 7.60 6.02 Sp. Conductivity (mS.cm-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.911 0.882 0.844 0.956 0.865 1.554 1.380 0.872 0.993 1.508 1.053 0.859 max 0.927 0.904 0.852 0.960 1.159 1.766 1.645 1.251 1.360 1.619 1.367 0.864 med 0.919 0.893 0.848 0.958 0.956 1.660 1.513 1.062 1.177 1.550 1.210 0.862
The 2018 data for the downstream Ellen Brook site followed the background data, much as the data did at the upstream site at Almeria Parade (SWN3). Many of the measured parameters (total nitrogen, dissolved organic nitrogen, total phosphorus, filterable reactive phosphorus and dissolved organic carbon) show a seasonal peak in concentrations and greater variability in response to winter flows from the upper catchment; i.e. when the sampling site SWN3 at Almeria Parade flowed, and the entire catchment was connected.
120 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
13 Ellis Brook (EBGS01) The 90th Percentile for Oct was 1.40 mg.L-1 1.0 EBGS01 (ELLIS BK) TN
2013-2017 data 0.8 2018 data
) 0.6 -1
TN (mg L 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=3 n=9 n=10 n=8 n=0 n=0
Figure 127 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site EBGS01 (Ellis Bk).
The 90th Percentile for Oct was 0.55 mg.L-1 0.08
EBGS01 (ELLIS BK) NH3-N
2013-2017 data 2018 data 0.06 ) -1
0.04 -N(mg L 3 NH
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=3 n=9 n=10 n=8 n=0 n=0
+ -1 Figure 128 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site EBGS01 (Ellis Bk).
Department of Water and Environmental Regulation 121 Swan Canning Catchment Data Report January - December 2018
0.5 EBGS01 (ELLIS BK) NOx-N 2013-2017 data 2018 data
0.4 )
-1 0.3
0.2 NOx-N(mg L
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=3 n=9 n=10 n=8 n=0 n=0
Figure 129 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at EBGS01 (Ellis Bk).
0.7 EBGS01 (ELLIS BK) DOrgN
0.6 2013-2017 data 2018 data
0.5 ) -1 0.4
0.3 DOrgN(mg L
0.2
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=3 n=9 n=10 n=8 n=0 n=0
Figure 130 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at EBGS01 (Ellis Bk).
122 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
The 90th Percentile for Oct was 0.27 mg.L-1 0.10 EBGS01 (ELLIS BK) TP
2013-2017 data 0.08 2018 data
) 0.06 -1
TP(mg L 0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=3 n=9 n=10 n=8 n=0 n=0
Figure 131 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site EBGS01 (Ellis Bk).
0.05 EBGS01 (ELLIS BK) FRP
2013-2017 data 0.04 2018 data
) 0.03 -1
FRP(mg L 0.02
0.01
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=3 n=9 n=10 n=8 n=0 n=0
Figure 132 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at EBGS01 (Ellis Bk).
Department of Water and Environmental Regulation 123 Swan Canning Catchment Data Report January - December 2018
14 EBGS01 (ELLIS BK) DOC
12 2013-2017 data 2018 data
10 ) -1 8
6 DOC(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=3 n=9 n=10 n=8 n=0 n=0
Figure 133 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at EBGS01 (Ellis Bk).
The 90th Percentile for Oct was 59 mg.L-1 20 EBGS01 (ELLIS BK) TSS
2013-2017 data 2018 data 15 ) -1
10 TSS(mg L
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=3 n=9 n=10 n=8 n=0 n=0
Figure 134 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site EBGS01 (Ellis Bk).
124 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
12 EBGS01 (ELLIS BK) DO
2013-2017 data 10 2018 data
8 ) -1
6 DO(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=3 n=9 n=10 n=8 n=0 n=0
Figure 135 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site EBGS01 (Ellis Bk).
1.6 EBGS01 (ELLIS BK) Sp. Conductivity 1.4 2013-2017 data 2018 data 1.2 ) -1 1.0
0.8
0.6 Sp.Cond (mS cm
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=3 n=9 n=10 n=8 n=0 n=0
Figure 136 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site EBGS01 (Ellis Bk).
Department of Water and Environmental Regulation 125 Swan Canning Catchment Data Report January - December 2018
Table 16 2018 monthly sample numbers, minimum and maximum values at EBGS01 (Ellis Bk).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 0 0 0 0 0 0 1 3 2 2 0 0 min ------0.35 0.57 0.27 0.25 - - max ------0.35 0.82 0.33 0.44 - - med ------0.35 0.62 0.30 0.35 - -
-1 NH3-N (mg.L ) n 0 0 0 0 0 0 1 3 2 2 0 0 min ------0.015 <0.01 <0.01 0.018 - - max ------0.015 0.026 0.044 0.084 - - med ------0.015 0.024 0.025 0.051 - -
-1 NOx-N (mg.L ) n 0 0 0 0 0 0 1 3 2 2 0 0 min ------0.021 0.062 0.062 0.005 - - max ------0.021 0.340 0.072 0.029 - - med ------0.021 0.210 0.067 0.017 - - DOrgN (mg.L-1) n 0 0 0 0 0 0 1 3 2 2 0 0 min ------0.28 0.24 0.16 0.22 - - max ------0.28 0.50 0.25 0.25 - - med ------0.28 0.29 0.21 0.24 - - TP (mg.L-1) n 0 0 0 0 0 0 1 3 2 2 0 0 min ------0.017 0.033 0.011 0.017 - - max ------0.017 0.089 0.018 0.019 - - med ------0.017 0.082 0.015 0.018 - - FRP (mg.L-1) n 0 0 0 0 0 0 1 3 2 2 0 0 min ------<0.005 0.008 <0.005 0.010 - - max ------<0.005 0.062 0.009 0.016 - - med ------<0.005 0.040 0.006 0.013 - - DOC (mg.L-1) n 0 0 0 0 0 0 1 3 2 2 0 0 min ------8 6 5 6 - - max ------8 10 6 7 - - med ------8 8 5.5 6.5 - - TSS (mg.L-1) n 0 0 0 0 0 0 1 3 2 2 0 0 min ------<1 2 2 2 - - max ------<1 13 4 3 - - med ------<1 11 3 2.5 - -
126 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 0 0 0 0 0 0 1 3 2 2 0 0 min ------6.79 8.93 8.48 6.39 - - max ------6.79 9.35 9.42 8.16 - - med ------6.79 9.33 8.95 7.28 - - Sp. Conductivity (mS.cm-1) n 0 0 0 0 0 0 1 3 2 2 0 0 min ------0.439 0.307 0.500 0.882 - - max ------0.439 0.365 0.738 1.061 - - med ------0.439 0.364 0.619 0.972 - -
Ellis Brook is not a gauged catchment, so there was no flow data. It is an ephemeral system which normally only flows during winter and spring in response to rainfall, as was the case in 2018 with only eight samples collected over the year between mid- July and the end of October. There was some variability in the total nitrogen, ammoniacal nitrogen and total oxidised nitrogen data in 2018 but there is also a moderate degree of variability in the background data but absolute concentrations are relatively low, certainly compared to other catchments. There was a spike in August in the concentrations of total phosphorus, filterable reactive phosphorus and TSS, but the concentrations, in absolute terms, are relatively low. The nutrient data collected at this site tends to be relatively low and the site only flows weakly for a few months during winter; as such there is a strong case for discontinuing sampling at this site.
Department of Water and Environmental Regulation 127 Swan Canning Catchment Data Report January - December 2018
14 Helena River (SWN10)
3.0 SWN10 (HELENA) TN 2013-2017 data 2018 data 2.5
2.0 ) -1
1.5 TN(mg L
1.0
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=4 n=11 n=12 n=10 n=10 n=10 n=12 n=6
Figure 137 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN10 (Helena R).
2.0
SWN10 (HELENA) NH3-N
2013-2017 data 2018 data 1.5 ) -1
1.0 -N(mg L 3 NH
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=4 n=11 n=12 n=10 n=10 n=10 n=12 n=6
+ -1 Figure 138 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN10 (Helena R).
128 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
1.2
SWN10 (HELENA) NOx-N 2013-2017 data 2018 data 1.0
0.8 ) -1
0.6 NOx-N(mg L 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=4 n=11 n=12 n=10 n=10 n=10 n=12 n=6
Figure 139 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN10 (Helena R).
1.0
SWN10 (HELENA) DOrgN 2013-2017 data 2018 data
0.8 )
-1 0.6
0.4 DOrgN(mg L
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=4 n=11 n=12 n=10 n=10 n=10 n=12 n=6
Figure 140 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN10 (Helena R).
Department of Water and Environmental Regulation 129 Swan Canning Catchment Data Report January - December 2018
0.10 SWN10 (HELENA) TP 2013-2017 data 2018 data
0.08
) 0.06 -1
TP(mg L 0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=4 n=11 n=12 n=10 n=10 n=10 n=12 n=6
Figure 141 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN10 (Helena R).
0.05 SWN10 (HELENA) FRP 2013-2017 data 2018 data
0.04
) 0.03 -1
FRP(mg L 0.02
0.01
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=4 n=11 n=12 n=10 n=10 n=10 n=12 n=6
Figure 142 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN10 (Helena R).
130 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
16
SWN10 (HELENA) DOC 2013-2017 data 14 2018 data
12
10 ) -1
8 DOC(mg L 6
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=4 n=11 n=12 n=10 n=10 n=10 n=12 n=6
Figure 143 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN10 (Helena R).
The 90th Percentile for Jun was 48 mg.L-1 40 SWN10 (HELENA) TSS
2013-2017 data 2018 data 30 ) -1
20 TSS(mg L
10
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=4 n=11 n=12 n=10 n=10 n=10 n=12 n=6
Figure 144 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN10 (Helena R).
Department of Water and Environmental Regulation 131 Swan Canning Catchment Data Report January - December 2018
10 SWN10 (HELENA) DO
2013-2017 data 8 2018 data
) 6 -1
DO(mg L 4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=4 n=11 n=12 n=10 n=10 n=10 n=12 n=6
Figure 145 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN10 (Helena R).
2.0 SWN10 (HELENA) Sp. Conductivity
1.5 ) -1
1.0 Sp.Cond (mS cm
0.5
2013-2017 data 2018 data
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=4 n=11 n=12 n=10 n=10 n=10 n=12 n=6
Figure 146 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN10 (Helena R).
132 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 17 2018 monthly sample numbers, minimum and maximum values at SWN10 (Helena R).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 0 0 0 0 1 2 2 2 2 3 2 2 min - - - - 0.98 0.51 0.72 0.74 0.62 0.71 0.65 0.84 max - - - - 0.98 0.90 0.95 1.00 1.50 0.83 0.66 1.10 med - - - - 0.98 0.71 0.84 0.87 1.06 0.73 0.66 0.97
-1 NH3-N (mg.L ) n 0 0 0 0 1 2 2 2 2 3 2 2 min - - - - 0.640 0.081 0.110 0.130 0.110 0.120 0.140 0.330 max - - - - 0.640 0.150 0.130 0.160 0.150 0.250 0.270 0.530 med - - - - 0.640 0.116 0.120 0.145 0.130 0.170 0.205 0.430
-1 NOx-N (mg.L ) n 0 0 0 0 1 2 2 2 2 3 2 2 min - - - - 0.081 0.038 0.170 0.240 0.170 0.140 0.061 0.019 max - - - - 0.081 0.140 0.420 0.420 0.210 0.230 0.170 0.051 med - - - - 0.081 0.089 0.295 0.330 0.190 0.190 0.116 0.035 DOrgN (mg.L-1) n 0 0 0 0 1 2 2 2 1 3 2 2 min - - - - 0.11 0.38 0.40 0.25 0.32 0.31 0.32 0.32 max - - - - 0.11 0.55 0.41 0.43 0.32 0.43 0.33 0.36 med - - - - 0.11 0.47 0.41 0.34 0.32 0.34 0.33 0.34 TP (mg.L-1) n 0 0 0 0 1 2 2 2 2 3 2 2 min - - - - 0.010 0.019 0.013 0.018 0.012 0.006 0.015 0.028 max - - - - 0.010 0.035 0.022 0.018 0.022 0.021 0.027 0.043 med - - - - 0.010 0.027 0.018 0.018 0.017 0.017 0.021 0.036 FRP (mg.L-1) n 0 0 0 0 1 2 2 2 2 3 2 2 min - - - - 0.006 0.006 0.006 <0.005 0.006 <0.005 <0.005 <0.005 max - - - - 0.006 0.010 0.007 0.005 0.007 0.006 0.006 <0.005 med - - - - 0.006 0.008 0.007 0.004 0.007 0.006 0.004 <0.005 DOC (mg.L-1) n 0 0 0 0 1 2 2 2 2 3 2 2 min - - - - 5 8 9 8 7 7 7 8 max - - - - 5 12 9 8 7 8 8 8 med - - - - 5 10 9 8 7 8 7.5 8 TSS (mg.L-1) n 0 0 0 0 1 2 2 2 2 3 2 2 min - - - - 2 6 4 4 5 6 7 10 max - - - - 2 6 5 4 7 9 8 19 med - - - - 2 6 4.5 4 6 7 7.5 14.5
Department of Water and Environmental Regulation 133 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 0 0 0 0 1 2 2 2 2 3 2 2 min - - - - 2.12 4.47 5.33 6.75 6.65 4.44 3.86 2.07 max - - - - 2.12 5.59 6.52 6.80 7.24 5.40 4.35 2.71 med - - - - 2.12 5.03 5.93 6.78 6.95 5.23 4.11 2.39 Sp. Conductivity (mS.cm-1) n 0 0 0 0 1 2 2 2 2 3 2 2 min - - - - 1.480 0.678 0.699 0.751 0.795 1.176 1.601 1.495 max - - - - 1.480 0.761 0.868 0.784 1.096 1.541 1.622 1.572 med - - - - 1.480 0.720 0.783 0.768 0.946 1.371 1.612 1.534
Please note, there is no hydrograph available for this site for 2018 as the station rating table is currently not fit for purpose. The 2018 data for Helena River was similar to the background data. The site flows in response to winter rain with many parameters being highly variable upon the resumption of flow and then the variability in the data generally reduces as the catchment reverts to base flow before ceasing to flow and drying out completely.
134 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
15 Helm Street Main Drain (SCCIS4)
5 The 90th Percentile for SCCIS4 (HELM ST) TN Apr was 7.31 mg.L-1 2013-2017 data 4 2018 data
) 3 -1
TN (mg L 2
1
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=8 n=8 n=9 n=11 n=8 n=10 n=12 n=11 n=12 n=9 n=8
Figure 147 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS4 (Helm St).
0.10
th SCCIS4 (HELM ST) NH3-N The 90 Percentile for Oct was 0.20 mg.L-1 2013-2017 data 0.08 2018 data )
-1 0.06 -N(mg L 3 0.04 NH
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=8 n=8 n=9 n=11 n=8 n=10 n=12 n=11 n=12 n=9 n=8
+ -1 Figure 148 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS4 (Helm St).
Department of Water and Environmental Regulation 135 Swan Canning Catchment Data Report January - December 2018
4 SCCIS4 (HELM ST) NOx-N
2013-2017 data 2018 data 3 ) -1
2 NOx-N(mg L
1
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=8 n=8 n=9 n=11 n=8 n=10 n=12 n=11 n=12 n=9 n=8
Figure 149 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS4 (Helm St).
The 90th Percentile for Apr was 3.51 mg.L-1 2.5 SCCIS4 (HELM ST) DOrgN
2013-2017 data 2.0 2018 data )
-1 1.5
1.0 DOrgN(mg L
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=8 n=8 n=9 n=11 n=8 n=10 n=12 n=11 n=12 n=9 n=8
Figure 150 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS4 (Helm St).
136 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
0.25 SCCIS4 (HELM ST) TP
2013-2017 data 0.20 2018 data
) 0.15 -1
TP(mg L 0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=8 n=8 n=9 n=11 n=8 n=10 n=12 n=11 n=12 n=9 n=8
Figure 151 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS4 (Helm St).
0.18 SCCIS4 (HELM ST) FRP 0.16 2013-2017 data 2018 data 0.14
0.12 ) -1 0.10
0.08 FRP(mg L
0.06
0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=8 n=8 n=9 n=11 n=8 n=10 n=12 n=11 n=12 n=9 n=8
Figure 152 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS4 (Helm St).
Department of Water and Environmental Regulation 137 Swan Canning Catchment Data Report January - December 2018
35 SCCIS4 (HELM ST) DOC
30 2013-2017 data 2018 data
25 ) -1 20
15 DOC(mg L
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=8 n=8 n=9 n=11 n=8 n=10 n=12 n=11 n=12 n=9 n=8
Figure 153 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS4 (Helm St).
35 SCCIS4 (HELM ST) TSS
30 2013-2017 data 2018 data
25 ) -1 20
15 TSS(mg L
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=8 n=8 n=9 n=11 n=8 n=10 n=12 n=11 n=12 n=9 n=8
Figure 154 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS4 (Helm St).
138 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
16 SCCIS4 (HELM ST) DO
14 2013-2017 data 2018 data 12
10 ) -1
8 DO(mg L 6
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=8 n=8 n=9 n=11 n=8 n=10 n=12 n=11 n=12 n=9 n=8
Figure 155 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS4 (Helm St).
6 SCCIS4 (HELM ST) Sp. Conductivity
5 2013-2017 data 2018 data
) 4 -1
3
Sp.Cond (mS cm 2
1
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=8 n=8 n=9 n=11 n=8 n=10 n=12 n=11 n=12 n=9 n=8
Figure 156 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS4 (Helm St).
Department of Water and Environmental Regulation 139 Swan Canning Catchment Data Report January - December 2018
Table 18 2018 monthly sample numbers, minimum and maximum values at SCCIS4 (Helm St).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 3 2 1 0 0 2 2 3 2 2 2 2 min 1.40 1.60 1.60 - - 1.10 0.69 1.20 0.78 0.30 0.46 0.62 max 2.60 1.90 1.60 - - 1.50 2.30 1.50 1.10 0.58 0.54 0.73 med 1.50 1.75 1.60 - - 1.30 1.50 1.30 0.94 0.44 0.50 0.68
-1 NH3-N (mg.L ) n 3 2 1 0 0 2 2 3 2 2 2 2 min 0.012 0.025 0.036 - - 0.017 0.032 0.019 0.015 0.015 0.025 0.017 max 0.030 0.028 0.036 - - 0.030 0.047 0.035 0.022 0.028 0.027 0.022 med 0.020 0.027 0.036 - - 0.024 0.040 0.027 0.019 0.022 0.026 0.020
-1 NOx-N (mg.L ) n 3 2 1 0 0 2 2 3 2 2 2 2 min <0.01 <0.01 0.013 - - 0.440 0.430 0.380 0.450 0.073 <0.01 <0.01 max 1.200 <0.01 0.013 - - 0.950 1.700 1.000 0.600 0.110 0.015 <0.01 med 0.011 <0.01 0.013 - - 0.695 1.065 0.420 0.525 0.092 0.010 <0.01 DOrgN (mg.L-1) n 3 2 1 0 0 2 2 3 2 2 2 2 min 1.20 1.50 1.50 - - 0.36 0.17 0.48 0.30 <0.025 0.39 0.58 max 1.50 1.80 1.50 - - 0.50 0.51 0.72 0.38 0.39 0.47 0.61 med 1.30 1.65 1.50 - - 0.43 0.34 0.59 0.34 0.20 0.43 0.60 TP (mg.L-1) n 3 2 1 0 0 2 2 3 2 2 2 2 min 0.025 0.036 0.034 - - 0.075 0.067 0.095 0.033 0.031 0.043 0.054 max 0.140 0.043 0.034 - - 0.088 0.180 0.250 0.050 0.040 0.055 0.056 med 0.049 0.040 0.034 - - 0.082 0.124 0.130 0.042 0.036 0.049 0.055 FRP (mg.L-1) n 3 2 1 0 0 2 2 3 2 2 2 2 min <0.005 0.017 0.033 - - 0.050 0.052 0.064 0.010 0.021 0.023 0.027 max 0.110 0.027 0.033 - - 0.064 0.140 0.140 0.032 0.030 0.035 0.027 med 0.019 0.022 0.033 - - 0.057 0.096 0.092 0.021 0.026 0.029 0.027 DOC (mg.L-1) n 3 2 1 0 0 2 2 3 2 2 2 2 min 17 19 18 - - 8 3 9 6 7 6 9 max 22 25 18 - - 10 14 14 7 8 8 10 med 18 22 18 - - 9 8.5 13 6.5 7.5 7 9.5 TSS (mg.L-1) n 3 2 1 0 0 2 2 3 2 2 2 2 min 1 2 1 - - 2 4 3 2 3 3 2 max 4 3 1 - - 4 7 39 4 9 4 6 med 2 2.5 1 - - 3 5.5 8 3 6 3.5 4
140 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 3 2 1 0 0 2 2 3 2 2 2 2 min 3.31 3.54 2.22 - - 7.87 9.36 9.55 9.58 9.75 4.40 4.64 max 4.68 4.15 2.22 - - 8.22 9.67 11.25 12.62 14.86 7.23 5.55 med 3.54 3.85 2.22 - - 8.05 9.52 10.30 11.10 12.31 5.82 5.10 Sp. Conductivity (mS.cm-1) n 3 2 1 0 0 2 2 3 2 2 2 2 min 2.216 2.442 3.299 - - 0.583 0.189 0.226 0.546 0.845 1.134 1.795 max 2.537 2.808 3.299 - - 0.647 0.849 0.465 0.778 0.955 1.606 2.088 med 2.229 2.625 3.299 - - 0.615 0.519 0.361 0.662 0.900 1.370 1.942
Helm Street main drain is an ungauged catchment. The 2018 data for Helm Street generally followed the background data; but it should be noted that the background data is highly variable for all measured parameters, (total suspended solids is a particularly clear example). This was not unexpected in this catchment which consistently exhibits relatively elevated nutrient concentrations and which is relatively small, highly modified, and responds flashily to rainfall events. While variability was high there was a seasonal pattern of increased concentrations of total oxidised nitrogen during late autumn and through winter. This was reflected in the total nitrogen data which exhibits much greater variability over the same period than during other times of the year.
Department of Water and Environmental Regulation 141 Swan Canning Catchment Data Report January - December 2018
16 Henley Brook (HBBROCK)
3.0 The 90th Percentile for HBBROCK (HENLEY BK) TN Apr was 4.71 mg.L-1 2013-2017 data 2.5 2018 data
2.0 ) -1
1.5 TN(mg L
1.0
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=3 n=4 n=8 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=7
Figure 157 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site HBBROCK (Henley Bk).
0.16
HBBROCK (HENLEY BK) NH3-N 0.14 2013-2017 data 2018 data 0.12
) 0.10 -1
0.08 -N(mg L 3
NH 0.06
0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=3 n=4 n=8 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=7
+ -1 Figure 158 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site HBBROCK (Henley Bk).
142 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
0.7 HBBROCK (HENLEY BK) NOx-N
0.6 2013-2017 data 2018 data
0.5 ) -1 0.4
0.3 NOx-N(mg L
0.2
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=3 n=4 n=8 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=7
Figure 159 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at HBBROCK (Henley Bk).
1.4 HBBROCK (HENLEY BK) DOrgN
1.2 2013-2017 data 2018 data
1.0 ) -1 0.8
0.6 DOrgN(mg L
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=3 n=4 n=8 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=7
Figure 160 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at HBBROCK (Henley Bk).
Department of Water and Environmental Regulation 143 Swan Canning Catchment Data Report January - December 2018
The 90th Percentile for Apr was 0.59 mg.L-1 0.30 HBBROCK (HENLEY BK) TP
0.25 2013-2017 data 2018 data
0.20 ) -1
0.15 TP(mg L
0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=3 n=4 n=8 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=7
Figure 161 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site HBBROCK (Henley Bk).
0.10 HBBROCK (HENLEY BK) FRP
2013-2017 data 0.08 2018 data
) 0.06 -1
FRP(mg L 0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=3 n=4 n=8 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=7
Figure 1622 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site HBBROCK (Henley Bk).
144 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
25 HBBROCK (HENLEY BK) DOC
20
) 15 -1
DOC(mg L 10
5
2013-2017 data 2018 data 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=3 n=4 n=8 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=7
Figure 163 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at HBBROCK (Henley Bk).
60 HBBROCK (HENLEY BK) TSS
2013-2017 data 50 2018 data
40 ) -1
30 TSS(mg L
20
10
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=3 n=4 n=8 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=7
Figure 164 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site HBBROCK (Henley Bk).
Department of Water and Environmental Regulation 145 Swan Canning Catchment Data Report January - December 2018
12
HBBROCK (HENLEY BK) DO 2013-2017 data 2018 data 10
8 ) -1
6 DO(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=3 n=4 n=8 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=7
Figure 165 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site HBBROCK (Henley Bk).
1.0 HBBROCK (HENLEY BK) Sp. Conductivity 2013-2017 data 2018 data
0.8 ) -1 0.6
0.4 Sp.Cond (mS cm
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=3 n=4 n=8 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=7
Figure 166 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site HBBROCK (Henley Bk).
146 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 19 2018 monthly sample numbers, minimum and maximum values at HBBROCK (Henley Bk).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 3 1 1 2 2 2 2 3 2 2 2 2 min 0.81 0.91 1.20 0.58 0.57 0.82 0.99 1.00 0.77 0.64 0.75 0.73 max 1.30 0.91 1.20 0.82 0.66 1.10 1.00 1.60 1.20 0.76 1.00 0.75 med 1.10 0.91 1.20 0.70 0.62 0.96 1.00 1.50 0.99 0.70 0.88 0.74
-1 NH3-N (mg.L ) n 3 1 1 2 2 2 2 3 2 2 2 2 min 0.017 0.033 0.028 0.024 0.051 0.044 0.034 0.036 0.034 0.031 0.037 0.030 max 0.220 0.033 0.028 0.039 0.061 0.074 0.043 0.056 0.048 0.042 0.040 0.033 med 0.024 0.033 0.028 0.032 0.056 0.059 0.039 0.051 0.041 0.037 0.039 0.032
-1 NOx-N (mg.L ) n 3 1 1 2 2 2 2 3 2 2 2 2 min <0.01 0.013 0.023 0.020 0.045 0.210 0.410 0.350 0.100 0.055 0.014 <0.01 max 0.092 0.013 0.023 0.030 0.049 0.340 0.430 0.460 0.310 0.068 0.020 0.011 med 0.013 0.013 0.023 0.025 0.047 0.275 0.420 0.380 0.205 0.062 0.017 0.008 DOrgN (mg.L-1) n 3 1 1 2 2 2 2 3 2 2 2 2 min 0.58 0.59 0.64 0.51 0.46 0.47 0.51 0.53 0.63 0.33 0.67 0.60 max 0.65 0.59 0.64 0.68 0.52 0.53 0.52 1.10 0.78 0.60 0.67 0.63 med 0.64 0.59 0.64 0.60 0.49 0.50 0.52 0.90 0.71 0.47 0.67 0.62 TP (mg.L-1) n 3 1 1 2 2 2 2 3 2 2 2 2 min 0.083 0.070 0.120 0.060 0.051 0.050 0.047 0.064 0.051 0.043 0.063 0.053 max 0.150 0.070 0.120 0.065 0.057 0.073 0.059 0.100 0.068 0.052 0.100 0.056 med 0.130 0.070 0.120 0.063 0.054 0.062 0.053 0.071 0.060 0.048 0.082 0.055 FRP (mg.L-1) n 3 1 1 2 2 2 2 3 2 2 2 2 min 0.029 0.015 0.018 0.014 0.026 0.018 0.023 0.032 0.029 0.028 0.026 0.019 max 0.048 0.015 0.018 0.040 0.030 0.033 0.033 0.054 0.039 0.038 0.027 0.021 med 0.035 0.015 0.018 0.027 0.028 0.026 0.028 0.038 0.034 0.033 0.027 0.020 DOC (mg.L-1) n 3 1 1 2 2 2 2 3 2 2 2 2 min 14 15 17 13 12 12 13 15 18 16 13 16 max 18 15 17 16 13 13 14 22 20 17 17 16 med 15 15 17 14.5 12.5 12.5 13.5 20 19 16.5 15 16 TSS (mg.L-1) n 3 1 1 2 2 2 2 3 2 2 2 2 min 9 11 11 5 3 5 3 3 1 3 14 5 max 26 11 11 6 7 8 7 9 3 5 24 13 med 11 11 11 5.5 5 6.5 5 3 2 4 19 9
Department of Water and Environmental Regulation 147 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 3 1 1 2 2 2 2 3 2 2 2 2 min 2.73 6.64 6.24 6.91 7.63 8.50 9.28 8.71 8.98 7.81 7.08 6.90 max 7.16 6.64 6.24 7.41 7.93 9.23 9.30 9.20 8.99 8.19 7.35 7.36 med 5.87 6.64 6.24 7.16 7.78 8.87 9.29 8.73 8.99 8.00 7.22 7.13 Sp. Conductivity (mS.cm-1) n 3 1 1 2 2 2 2 3 2 2 2 2 min 0.462 0.577 0.656 0.614 0.594 0.502 0.480 0.523 0.534 0.541 0.581 0.603 max 0.657 0.577 0.656 0.649 0.605 0.514 0.522 0.543 0.548 0.559 0.601 0.629 med 0.556 0.577 0.656 0.632 0.600 0.508 0.501 0.526 0.541 0.550 0.591 0.616
Henley Brook is another ungauged catchment. The 2018 data for the catchment followed the background data, which varies greatly. Total oxidised nitrogen concentrations showed a clear seasonal response to winter rain and flow and also greater variability during winter. Total nitrogen concentrations didn’t follow the same pattern yet were moderately elevated on occasion through the year, as were total phosphorus concentrations. Total phosphorus and filterable reactive phosphorus concentrations were more variable in summer and early autumn.
148 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
17 Jane Brook (SWN7)
1.6 SWN7 (JANE BK) TN
1.4 2013-2017 data 2018 data 1.2
1.0 ) -1
0.8 TN(mg L 0.6
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=0 n=0 n=1 n=1 n=10 n=12 n=10 n=10 n=10 n=11 n=6
Figure 167 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN7 (Jane Bk).
0.25
SWN7 (JANE BK) NH3-N
2013-2017 data 0.20 2018 data )
-1 0.15 -N(mg L 3 0.10 NH
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=0 n=0 n=1 n=1 n=10 n=12 n=10 n=10 n=10 n=11 n=6
+ -1 Figure 168 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN7 (Jane Bk).
Department of Water and Environmental Regulation 149 Swan Canning Catchment Data Report January - December 2018
1.0 SWN7 (JANE BK) NOx-N 2013-2017 data 2018 data
0.8 )
-1 0.6
0.4 NOx-N(mg L
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=0 n=0 n=1 n=1 n=10 n=12 n=10 n=10 n=10 n=11 n=6
Figure 169 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN7 (Jane Bk).
0.7 SWN7 (JANE BK) DOrgN
0.6 2013-2017 data 2018 data
0.5 ) -1 0.4
0.3 DOrgN(mg L
0.2
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=0 n=0 n=1 n=1 n=10 n=12 n=10 n=10 n=10 n=11 n=6
Figure 170 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN7 (Jane Bk).
150 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
0.14 SWN7 (JANE BK) TP
0.12 2013-2017 data 2018 data
0.10 )
-1 0.08
0.06 TP(mg L
0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=0 n=0 n=1 n=1 n=10 n=12 n=10 n=10 n=10 n=11 n=6
Figure 171 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN7 (Jane Bk).
0.08 SWN7 (JANE BK) FRP 2013-2017 data 2018 data
0.06 ) -1
0.04 FRP(mg L
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=0 n=0 n=1 n=1 n=10 n=12 n=10 n=10 n=10 n=11 n=6
Figure 172 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN7 (Jane Bk).
Department of Water and Environmental Regulation 151 Swan Canning Catchment Data Report January - December 2018
16
SWN7 (JANE BK) DOC 2013-2017 data 14 2018 data
12
10 ) -1
8 DOC(mg L 6
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=0 n=0 n=1 n=1 n=10 n=12 n=10 n=10 n=10 n=11 n=6
Figure 173 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN7 (Jane Bk).
35 SWN7 (JANE BK) TSS
30 2013-2017 data 2018 data
25 ) -1 20
15 TSS(mg L
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=0 n=0 n=1 n=1 n=10 n=12 n=10 n=10 n=10 n=10 n=6
Figure 174 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN7 (Jane Bk).
152 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
10 SWN7 (JANE BK) DO
2013-2017 data 8 2018 data
) 6 -1
DO(mg L 4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=0 n=0 n=1 n=1 n=10 n=12 n=10 n=10 n=10 n=11 n=6
Figure 175 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN7 (Jane Bk).
1.6
SWN7 (JANE BK) Sp. Conductivity 2013-2017 data 1.4 2018 data
1.2 ) -1 1.0
0.8
0.6 Sp.Cond (mS cm
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=2 n=0 n=0 n=1 n=1 n=10 n=12 n=10 n=10 n=10 n=11 n=6
Figure 176 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN7 (Jane Bk).
Department of Water and Environmental Regulation 153 Swan Canning Catchment Data Report January - December 2018
Table 20 2018 monthly sample numbers, minimum and maximum values at SWN7 (Jane Bk).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 0 0 0 0 0 2 2 2 2 3 2 1 min - - - - - 0.46 0.83 0.90 0.77 0.39 0.30 1.20 max - - - - - 0.94 1.30 1.40 1.50 0.49 0.98 1.20 med - - - - - 0.70 1.07 1.15 1.14 0.44 0.64 1.20
-1 NH3-N (mg.L ) n 0 0 0 0 0 2 2 2 2 3 2 1 min - - - - - 0.026 0.028 0.040 0.040 0.025 0.024 <0.01 max - - - - - 0.034 0.074 0.042 0.056 0.065 0.150 <0.01 med - - - - - 0.030 0.051 0.041 0.048 0.043 0.087 <0.01
-1 NOx-N (mg.L ) n 0 0 0 0 0 2 2 2 2 3 2 1 min - - - - - 0.160 0.650 0.570 0.350 0.089 <0.01 0.012 max - - - - - 0.530 0.650 0.890 0.460 0.220 <0.01 0.012 med - - - - - 0.345 0.650 0.730 0.405 0.120 <0.01 0.012 DOrgN (mg.L-1) n 0 0 0 0 0 2 2 2 1 3 2 1 min - - - - - 0.250 0.140 0.290 0.270 0.110 0.190 0.200 max - - - - - 0.320 0.530 0.370 0.270 0.260 0.230 0.200 med - - - - - 0.285 0.335 0.330 0.270 0.160 0.210 0.200 TP (mg.L-1) n 0 0 0 0 0 2 2 2 2 3 2 1 min - - - - - 0.006 <0.005 0.035 0.015 <0.005 0.016 0.110 max - - - - - 0.014 0.061 0.040 0.035 0.020 0.083 0.110 med - - - - - 0.010 0.032 0.038 0.025 0.014 0.050 0.110 FRP (mg.L-1) n 0 0 0 0 0 2 2 2 2 3 2 1 min - - - - - <0.005 <0.005 0.020 0.014 <0.005 <0.005 <0.005 max - - - - - 0.007 0.040 0.022 0.021 0.010 <0.005 <0.005 med - - - - - 0.005 0.021 0.021 0.018 0.009 <0.005 <0.005 DOC (mg.L-1) n 0 0 0 0 0 2 2 2 2 3 2 1 min - - - - - 6 5 5 5 5 5 5 max - - - - - 7 8 7 5 5 5 5 med - - - - - 6.5 6.5 6 5 5 5 5 TSS (mg.L-1) n 0 0 0 0 0 2 2 2 2 3 2 1 min - - - - - 1 <1 3 <1 <1 5 31 max - - - - - 2 3 4 2 9 17 31 med - - - - - 1.5 1.75 3.5 1.25 1 11 31
154 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 0 0 0 0 0 2 2 2 2 3 2 1 min - - - - - 6.99 8.29 8.51 8.79 7.17 3.60 2.72 max - - - - - 7.09 8.42 8.96 8.89 8.16 5.33 2.72 med - - - - - 7.04 8.36 8.74 8.84 7.87 4.47 2.72 Sp. Conductivity (mS.cm-1) n 0 0 0 0 0 2 2 2 2 3 2 1 min - - - - - 0.729 0.573 0.483 0.543 0.807 1.015 1.010 max - - - - - 0.928 0.821 0.494 0.655 0.965 1.123 1.010 med - - - - - 0.829 0.697 0.489 0.599 0.810 1.069 1.010
Please note there is no hydrograph for this site as the stage height/flow data generated is not deemed fit for purpose by the surface water measurement team. The 2018 data generally followed the background data with a strong seasonal response to surface run off and flow seen in the total oxidised nitrogen data, with increased variability evident in the background data too over this winter period. This pattern is also evident in the total nitrogen data and to a lesser extent in the phosphorus data. The notable excursion from the background data was during the last two months of the year when total nitrogen and phosphorus were both relatively elevated; yet soluble fractions of nitrogen and phosphorus all recorded falling concentrations over the same period. This coincided with a relative increase in total suspended solids as the flows at the site slowed and the background data also shows increased variability. Field comments at the time mentioned the water looking “iron stained” and increasingly “turbid”, as conditions approached ‘cease to flow’ status, which happened mid-December 2018. Slow flow was noted as early as 3rd October 2018 as surface run off reduced. The increased nitrogen and phosphorus spike was particulate but the source is uncertain; the unusually heavy clay soils (for the Swan coastal plain) at the site could be partly responsible. As the flow reduces and the fine clay particulates are left in suspension along with associated nitrogen and phosphorus bound to them; all of which are diluted during wetter months by higher surface run off from winter rains.
Department of Water and Environmental Regulation 155 Swan Canning Catchment Data Report January - December 2018
18 Lower Canning (SCCIS3)
4 SCCIS3 (COCKRAM ST MD) TN 2013-2017 data 2018 data
3 ) -1
2 TN (mg L
1
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=9 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 177 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS3 (Lower Canning).
The 90th Percentile for Jan was 1.70 mg.L-1 0.8
SCCIS3 (COCKRAM ST MD) NH3-N
2013-2017 data 2018 data 0.6 ) -1
0.4 -N (mgL 3 NH
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=9 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
+ -1 Figure 178 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS3 (Lower Canning).
156 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
3.0 SCCIS3 (COCKRAM ST MD) NOx-N 2013-2017 data 2018 data 2.5
2.0 ) -1
1.5 NOx-N(mg L 1.0
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=9 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 179 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS3 (Lower Canning).
1.8 SCCIS3 (COCKRAM ST MD) DOrgN 2013-2017 data 1.6 2018 data
1.4
1.2 ) -1 1.0
0.8 DOrgN(mg L 0.6
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=9 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 180 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS3 (Lower Canning).
Department of Water and Environmental Regulation 157 Swan Canning Catchment Data Report January - December 2018
The 90th Percentile for Jan was 0.81 mg.L-1 0.7 SCCIS3 (COCKRAM ST MD) TP
0.6
0.5 )
-1 0.4
0.3 TP(mg L
0.2
0.1 2013-2017 data 2018 data
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=9 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 181 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS3 (Lower Canning).
0.6 SCCIS3 (COCKRAM ST MD) FRP 2013-2017 data 2018 data 0.5
0.4 ) -1
0.3 FRP(mg L
0.2
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=9 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 182 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS3 (Lower Canning).
158 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
25 SCCIS3 (COCKRAM ST MD) DOC 2013-2017 data 2018 data
20
) 15 -1
DOC(mg L 10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=9 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 183 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS3 (Lower Canning).
The 90th Percentile for The 90th Percentile for May was 41 mg.L-1 Jun was 42 mg.L-1 25 SCCIS3 (COCKRAM ST MD) TSS
2013-2017 data 2018 data 20
) 15 -1
TSS(mg L 10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=9 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 184 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS3 (Lower Canning).
Department of Water and Environmental Regulation 159 Swan Canning Catchment Data Report January - December 2018
10 2013-2017 data SCCIS3 (COCKRAM ST MD) DO 2018 data
8
) 6 -1
DO(mg L 4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=9 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 185 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS3 (Lower Canning).
1.4 SCCIS3 (COCKRAM ST MD) Sp. Conductivity
1.2
1.0 ) -1
0.8
0.6 Sp.Cond (mS cm
0.4
0.2 2013-2017 data 2018 data
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=9 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 186 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS3 (Lower Canning).
160 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 21 2018 monthly sample numbers, minimum and maximum values at SCCIS3 (Lower Canning).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 3 2 1 1 2 2 2 3 2 2 2 2 min 1.10 0.99 0.87 0.77 0.72 0.61 1.70 1.60 1.70 1.40 0.98 0.96 max 1.40 1.10 0.87 0.77 0.78 1.60 2.50 2.70 2.30 1.50 1.30 1.00 med 1.30 1.05 0.87 0.77 0.75 1.11 2.10 1.70 2.00 1.45 1.14 0.98
-1 NH3-N (mg.L ) n 3 2 1 1 2 2 2 3 2 2 2 2 min 0.037 0.036 0.034 0.029 0.027 0.040 0.051 0.033 0.035 0.019 0.015 0.030 max 0.110 0.038 0.034 0.029 0.030 0.057 0.059 0.047 0.043 0.037 0.039 0.060 med 0.100 0.037 0.034 0.029 0.029 0.049 0.055 0.042 0.039 0.028 0.027 0.045
-1 NOx-N (mg.L ) n 3 2 1 1 2 2 2 3 2 2 2 2 min 0.070 0.120 0.055 0.100 0.082 0.210 1.000 0.900 0.850 0.530 0.200 0.075 max 0.400 0.170 0.055 0.100 0.096 0.790 1.700 1.800 1.500 0.630 0.360 0.110 med 0.250 0.145 0.055 0.100 0.089 0.500 1.350 0.900 1.175 0.580 0.280 0.093 DOrgN (mg.L-1) n 3 2 1 1 2 2 2 3 2 2 2 2 min 0.61 0.69 0.77 0.62 0.55 0.33 0.47 0.48 0.74 0.23 0.76 0.76 max 0.88 0.81 0.77 0.62 0.62 0.50 0.53 0.92 0.81 0.71 0.87 0.77 med 0.85 0.75 0.77 0.62 0.59 0.42 0.50 0.48 0.78 0.47 0.82 0.77 TP (mg.L-1) n 3 2 1 1 2 2 2 3 2 2 2 2 min 0.290 0.200 0.300 0.290 0.190 0.130 0.190 0.180 0.190 0.190 0.140 0.140 max 0.580 0.300 0.300 0.290 0.230 0.170 0.230 0.260 0.240 0.210 0.190 0.240 med 0.340 0.250 0.300 0.290 0.210 0.150 0.210 0.180 0.215 0.200 0.165 0.190 FRP (mg.L-1) n 3 2 1 1 2 2 2 3 2 2 2 2 min 0.220 0.160 0.260 0.290 0.160 0.088 0.140 0.120 0.180 0.150 0.120 0.091 max 0.530 0.270 0.260 0.290 0.210 0.140 0.180 0.210 0.200 0.180 0.160 0.200 med 0.240 0.215 0.260 0.290 0.185 0.114 0.160 0.150 0.190 0.165 0.140 0.146 DOC (mg.L-1) n 3 2 1 1 2 2 2 3 2 2 2 2 min 12 16 15 14 14 6 11 9 17 17 15 16 max 18 18 15 14 14 13 15 16 18 17 15 16 med 17 17 15 14 14 9.5 13 11 17.5 17 15 16 TSS (mg.L-1) n 3 2 1 1 2 2 2 3 2 2 2 2 min 3 4 2 3 0.5 5 5 2 2 0.5 2 5 max 22 5 2 3 2 21 8 13 2 2 3 7 med 4 4.5 2 3 1.25 13 6.5 3 2 1.25 2.5 6
Department of Water and Environmental Regulation 161 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 3 2 1 1 2 2 2 3 2 2 2 2 min 1.16 4.37 2.16 2.56 3.01 5.07 6.16 7.41 8.09 6.69 6.84 2.49 max 2.39 4.81 2.16 2.56 3.82 6.81 6.60 8.45 8.50 8.92 7.69 4.39 med 1.78 4.59 2.16 2.56 3.42 5.94 6.38 7.93 8.30 7.81 7.27 3.44 Sp. Conductivity (mS.cm-1) n 3 2 1 1 2 2 2 3 2 2 2 2 min 0.516 1.014 1.027 0.856 0.990 0.352 0.644 0.464 0.867 0.816 0.945 0.958 max 2.038 1.038 1.027 0.856 0.996 0.762 0.915 0.771 0.956 0.896 1.355 1.226 med 0.990 1.026 1.027 0.856 0.993 0.557 0.780 0.523 0.912 0.856 1.150 1.092
Cockram Street main drain is ungauged. The 2018 data generally followed the background data with the exception of slightly lower concentrations of total nitrogen and total oxidised nitrogen in August, when concentrations are normally highest. At this site total nitrogen seems to be driven largely by the total oxidised nitrogen concentrations and both are highest (and with the greatest variability) during winter when flows are at their highest; a typical seasonal pattern for many catchments. Conversely, total phosphorus and filterable reactive phosphorus don’t show this seasonal response but rather tend to have slightly higher concentrations, and greater variability, during summer and early autumn. This suggests more of an influence from ground water interaction than an effect from winter surface run off.
162 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
19 Maylands-Inglewood MD (MIMDOUT)
1.6 MIMDOUT (MAYLANDS MD) TN
1.4
1.2
1.0 ) -1
0.8 TN(mg L 0.6
0.4
0.2 2013-2017 data 2018 data
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=6 n=3 n=5 n=1 n=1 n=0 n=4 n=7 n=11 n=11 n=9 n=10
Figure 187 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site MIMDOUT (Maylands MD).
0.25 MIMDOUT (MAYLANDS MD) NH -N 3 2013-2017 data 2018 data
0.20 )
-1 0.15 -N(mg L 3 0.10 NH
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=6 n=3 n=5 n=1 n=1 n=0 n=4 n=7 n=11 n=11 n=9 n=10
+ -1 Figure 188 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site MIMDOUT (Maylands MD).
Department of Water and Environmental Regulation 163 Swan Canning Catchment Data Report January - December 2018
1.0 MIMDOUT (MAYLANDS MD) NOx-N
0.8 )
-1 0.6
0.4 NOx-N(mg L
0.2
2013-2017 data 2018 data 0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=6 n=3 n=5 n=1 n=1 n=0 n=4 n=7 n=11 n=11 n=9 n=10
Figure 189 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at MIMDOUT (Maylands MD).
0.8 MIMDOUT (MAYLANDS MD) DOrgN 2013-2017 data 2018 data
0.6 ) -1
0.4 DOrgN(mg L
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=6 n=3 n=5 n=1 n=1 n=0 n=4 n=7 n=11 n=11 n=9 n=10
Figure 190 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at MIMDOUT (Maylands MD).
164 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
The 90th Percentile for Dec was 0.10 mg.L-1 0.08 MIMDOUT (MAYLANDS MD) TP
2013-2017 data 2018 data 0.06 ) -1
0.04 TP(mg L
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=6 n=3 n=5 n=1 n=1 n=0 n=4 n=7 n=11 n=11 n=9 n=10
Figure 191 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site MIMDOUT (Maylands MD).
0.030 MIMDOUT (MAYLANDS MD) FRP
0.025 2013-2017 data 2018 data
0.020 ) -1
0.015 FRP(mg L
0.010
0.005
0.000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=6 n=3 n=5 n=1 n=1 n=0 n=4 n=7 n=11 n=11 n=9 n=10
Figure 192 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at MIMDOUT (Maylands MD).
Department of Water and Environmental Regulation 165 Swan Canning Catchment Data Report January - December 2018
20 MIMDOUT (MAYLANDS MD) DOC 18
16
14
) 12 -1
10
DOC(mg L 8
6
4
2 2013-2017 data 2018 data
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=6 n=3 n=5 n=1 n=1 n=0 n=4 n=7 n=11 n=11 n=9 n=10
Figure 193 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at MIMDOUT (Maylands MD). The 90th Percentile for The 90th Percentile for Aug was 22 mg.L-1 Sep was 43 mg.L-1 18 MIMDOUT (MAYLANDS MD) TSS 16 2013-2017 data 2018 data 14
12 ) -1 10
8 TSS(mg L
6
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=6 n=3 n=5 n=1 n=1 n=0 n=4 n=7 n=11 n=11 n=9 n=10
Figure 194 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site MIMDOUT (Maylands MD).
166 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
12 MIMDOUT (MAYLANDS MD) DO
10
8 ) -1
6 DO(mg L
4
2 2013-2017 data 2018 data 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=6 n=3 n=5 n=1 n=1 n=0 n=4 n=7 n=11 n=11 n=9 n=10
Figure 195 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site MIMDOUT (Maylands MD).
12 MIMDOUT (MAYLANDS MD) Sp. Conductivity
2013-2017 data 10 2018 data
) 8 -1
6
Sp. Cond(mS cm 4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=6 n=3 n=5 n=1 n=1 n=0 n=4 n=7 n=11 n=11 n=9 n=10
Figure 196 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site MIMDOUT (Maylands MD).
Department of Water and Environmental Regulation 167 Swan Canning Catchment Data Report January - December 2018
Table 22 2018 monthly sample numbers, minimum and maximum values at MIMDOUT (Maylands MD).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 2 2 0 0 0 0 1 2 2 1 2 2 min 0.95 0.98 - - - - 1.20 1.10 1.10 1.10 0.98 0.96 max 1.10 1.20 - - - - 1.20 1.30 1.20 1.10 0.99 1.00 med 1.03 1.09 - - - - 1.20 1.20 1.15 1.10 0.99 0.98
-1 NH3-N (mg.L ) n 2 2 0 0 0 0 1 2 2 1 2 2 min 0.062 0.055 - - - - 0.071 0.060 0.066 0.066 0.054 0.050 max 0.063 0.360 - - - - 0.071 0.065 0.070 0.066 0.071 0.055 med 0.063 0.208 - - - - 0.071 0.063 0.068 0.066 0.063 0.053
-1 NOx-N (mg.L ) n 2 2 0 0 0 0 1 2 2 1 2 2 min 0.48 0.48 - - - - 0.76 0.54 0.62 0.63 0.54 0.43 max 0.53 0.51 - - - - 0.76 0.78 0.63 0.63 0.54 0.49 med 0.51 0.50 - - - - 0.76 0.66 0.63 0.63 0.54 0.46 DOrgN (mg.L-1) n 2 2 0 0 0 0 1 2 2 1 2 2 min 0.41 0.33 - - - - 0.33 0.41 0.37 0.39 0.37 0.40 max 0.42 0.38 - - - - 0.33 0.42 0.51 0.39 0.39 0.42 med 0.42 0.36 - - - - 0.33 0.42 0.44 0.39 0.38 0.41 TP (mg.L-1) n 2 2 0 0 0 0 1 2 2 1 2 2 min 0.018 0.020 - - - - 0.016 0.032 0.012 0.019 0.009 0.020 max 0.019 0.053 - - - - 0.016 0.039 0.019 0.019 0.017 0.051 med 0.019 0.037 - - - - 0.016 0.036 0.016 0.019 0.013 0.036 FRP (mg.L-1) n 2 2 0 0 0 0 1 2 2 1 2 2 min 0.009 0.009 - - - - 0.015 0.015 0.009 0.017 0.008 0.012 max 0.011 0.024 - - - - 0.015 0.031 0.013 0.017 0.011 0.017 med 0.010 0.017 - - - - 0.015 0.023 0.011 0.017 0.010 0.015 DOC (mg.L-1) n 2 2 0 0 0 0 1 2 2 1 2 2 min 15 13 - - - - 14 12 14 14 12 14 max 16 15 - - - - 14 14 14 14 14 15 med 15.5 14 - - - - 14 13 14 14 13 14.5 TSS (mg.L-1) n 2 2 0 0 0 0 1 2 2 1 2 2 min 2 <1 - - - - <1 <1 <1 2 <1 <1 max 3 2 - - - - <1 1 2 2 2 14 med 2.5 1.25 - - - - <1 0.75 1.25 2 1.25 7.25
168 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 2 2 0 0 0 0 1 2 2 1 2 2 min 7.44 8.10 - - - - 8.70 8.66 8.38 8.54 8.48 8.11 max 7.60 8.25 - - - - 8.70 8.92 8.70 8.54 8.49 8.42 med 7.52 8.18 - - - - 8.70 8.79 8.54 8.54 8.49 8.27 Sp. Conductivity (mS.cm-1) n 2 2 0 0 0 0 1 2 2 1 2 2 min 0.600 0.609 - - - - 1.086 0.605 0.600 0.602 0.598 0.607 max 0.664 0.634 - - - - 1.086 1.853 0.609 0.602 0.603 0.629 med 0.632 0.622 - - - - 1.086 1.229 0.605 0.602 0.601 0.618
The Maylands-Inglewood main drain is ungauged. The data for this site is generally absent for winter as samples can only be collected when the drain is flowing well, and the tide is low. At various times, but particularly during autumn and early winter, the estuary tends to interact with the drain outflow meaning samples can’t be collected. The 2018 data for the Maylands-Inglewood main drain generally followed the background data except for ammoniacal nitrogen in January and February, but absolute concentrations were still relatively low. Total oxidised nitrogen and dissolved organic nitrogen were slightly departed from the background data in July although this was based on one sample only and the variation wasn’t especially notable when compared to background data from subsequent months.
Department of Water and Environmental Regulation 169 Swan Canning Catchment Data Report January - December 2018
20 Mills Street Main Drain (SWS1)
2.0 SWS1 (MILLS ST) TN 2013-2017 data 1.8 2018 data
1.6
1.4
) 1.2 -1
1.0
TN(mg L 0.8
0.6
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 197 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS1 (Mills St MD).
0.6
SWS1 (MILLS ST) NH3-N
2013-2017 data 0.5 2018 data
0.4 ) -1
0.3 -N(mg L 3 NH 0.2
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
+ -1 Figure 198 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS1 (Mills St MD).
170 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
1.0
SWS1 (MILLS ST) NOx-N 2013-2017 data 2018 data
0.8 )
-1 0.6
0.4 NOx-N(mg L
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 199 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS1 (Mills St MD).
1.2
SWS1 (MILLS ST) DOrgN 2013-2017 data 2018 data 1.0
0.8 ) -1
0.6 DOrgN(mg L 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 200 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS1 (Mills St MD).
Department of Water and Environmental Regulation 171 Swan Canning Catchment Data Report January - December 2018
0.4 SWS1 (MILLS ST) TP 2013-2017 data 2018 data
0.3 ) -1
0.2 TP(mg L
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 201 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS1 (Mills St MD).
0.18
SWS1 (MILLS ST) FRP 2013-2017 data 0.16 2018 data
0.14
0.12 ) -1 0.10
0.08 FRP(mg L
0.06
0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 202 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS1 (Mills St MD).
172 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
25 SWS1 (MILLS ST) DOC 2013-2017 data 2018 data
20
) 15 -1
DOC(mg L 10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 203 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS1 (Mills St MD).
25 SWS1 (MILLS ST) TSS
2013-2017 data 20 2018 data
) 15 -1
TSS(mg L 10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 204 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS1 (Mills St MD).
Department of Water and Environmental Regulation 173 Swan Canning Catchment Data Report January - December 2018
12 SWS1 (MILLS ST) DO 2013-2017 data 2018 data 10
8 ) -1
6 DO(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 205 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS1 (Mills St MD).
1.2 SWS1 (MILLS ST) Sp. Conductivity 2013-2017 data 2018 data 1.0
) 0.8 -1
0.6
Sp.Cond (mS cm 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 206 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS1 (Mills St MD).
174 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Mills St MD (SWS1) 2018 flow 160
140
120
100
80
60 Daily discharge (ML) discharge Daily 40
20
0
Date
Figure 207 2018 Mills St MD flow (616043) – Daily discharge hydrograph measured in megalitres
The 2018 hydrograph for Mills Street main drain has three gaps in the data; during May, late September and December 2018. While this is not ideal the data serves the purpose of being broadly indicative of the nature of the very flashy flows at the site in response to rainfall through the year; the peak flow recorded in January captures the response to the rain event of 16th Jan 2018 (96.2mm).
Department of Water and Environmental Regulation 175 Swan Canning Catchment Data Report January - December 2018
Table 23 2018 monthly sample numbers, minimum and maximum values at SWS1 (Mills St MD).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.87 0.92 0.78 0.72 0.74 0.73 1.20 0.99 0.61 0.70 0.58 0.84 max 1.20 0.99 0.89 0.94 0.83 0.99 1.20 1.20 2.00 1.00 0.88 1.10 med 1.04 0.96 0.84 0.83 0.81 0.86 1.20 1.10 1.31 0.94 0.73 0.97
-1 NH3-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.089 0.120 0.042 0.005 0.040 0.120 0.190 0.069 0.053 0.027 0.016 0.051 max 0.270 0.150 0.078 0.030 0.230 0.150 0.280 0.150 0.079 0.057 0.091 0.120 med 0.180 0.135 0.060 0.018 0.045 0.135 0.235 0.110 0.066 0.056 0.054 0.086
-1 NOx-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.046 0.140 0.067 0.074 0.110 0.240 0.410 0.450 0.240 0.086 0.054 0.090 max 0.140 0.160 0.130 0.200 0.210 0.290 0.510 0.570 0.480 0.390 0.100 0.100 med 0.093 0.150 0.099 0.137 0.160 0.265 0.460 0.510 0.360 0.380 0.077 0.095 DOrgN (mg.L-1) n 2 2 2 2 3 2 2 2 1 3 2 2 min 0.64 0.59 0.56 0.52 0.30 0.25 0.41 0.36 0.25 0.44 0.35 0.49 max 0.67 0.60 0.57 0.72 0.51 0.37 0.47 0.41 0.25 0.48 0.61 0.61 med 0.66 0.60 0.57 0.62 0.48 0.31 0.44 0.39 0.25 0.45 0.48 0.55 TP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.150 0.130 0.140 0.130 0.130 0.130 0.120 0.100 0.088 0.120 0.120 0.180 max 0.180 0.130 0.160 0.190 0.150 0.150 0.130 0.120 0.088 0.130 0.170 0.240 med 0.165 0.130 0.150 0.160 0.140 0.140 0.125 0.110 0.088 0.120 0.145 0.210 FRP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.085 0.080 0.092 0.090 0.087 0.029 0.069 0.052 0.040 0.071 0.072 0.110 max 0.100 0.084 0.093 0.110 0.110 0.077 0.089 0.069 0.064 0.081 0.093 0.130 med 0.093 0.082 0.093 0.100 0.093 0.053 0.079 0.061 0.052 0.076 0.083 0.120 DOC (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 14 14 13 15 10 5 9 8 6 12 9 14 max 15 15 13 19 13 7 9 9 14 14 14 15 med 14.5 14.5 13 17 13 6 9 8.5 10 14 11.5 14.5 TSS (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 4 2 2 3 2 9 3 5 0.5 1 5 10 max 25 4 4 6 3 15 4 7 8 4 11 19 med 14.5 3 3 4.5 2 12 3.5 6 4.25 4 8 14.5
176 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 5.21 4.80 3.42 2.52 4.64 7.50 7.79 7.77 7.73 5.24 5.02 5.14 max 6.07 6.63 3.60 3.52 6.78 8.44 8.10 8.06 8.22 7.04 5.68 5.16 med 5.64 5.72 3.51 3.02 5.23 7.97 7.95 7.92 7.98 5.98 5.35 5.15 Sp. Conductivity (mS.cm-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.576 0.680 0.692 0.527 0.443 0.211 0.419 0.344 0.244 0.486 0.597 0.681 max 0.686 0.697 0.712 0.686 0.641 0.314 0.518 0.445 0.568 0.598 0.630 0.712 med 0.631 0.689 0.702 0.607 0.608 0.263 0.468 0.395 0.406 0.551 0.614 0.697
The 2018 data for Mills Street main drain generally followed the background data with some minor variations, but many of the parameters at this site exhibit a high degree of variability; largely due to the flashy response of the flow in the drain to rain events, as illustrated by the hydrograph (Figure 207). This is partly a function of the relatively large proportion of the catchment that is impervious (37%1), resulting in a rapid surface run off in response to rain events. Filterable reactive phosphorus concentrations were generally elevated, compared to the background data, for much of 2018. This trend wasn’t as clear with the total phosphorus data although the 2018 tended towards to upper range of the background data. There was a clear seasonal response in total oxidised nitrogen data, and background variability, peaking over winter and spring. This was reflected in the total nitrogen data but not as clearly as with the total oxidised nitrogen.
1 Department of Water 2010, Hydrological and nutrient modelling of the Swan-Canning coastal catchments, Water Science technical series, Report no. 14, Department of Water, Western Australia.
Department of Water and Environmental Regulation 177 Swan Canning Catchment Data Report January - December 2018
21 Perth Airport North (SCCIS12)
1.8 SCCIS12 (PAN - LIMESTONE CK) TN 1.6
1.4
1.2 ) -1 1.0
0.8 TN(mg L
0.6
0.4
0.2 2013-2017 data 2018 data
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 208 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS12 (Perth Airport North).
0.16
SCCIS12 (PAN - LIMESTONE CK) NH3-N 2013-2017 data 0.14 2018 data
0.12
) 0.10 -1
0.08 -N(mg L 3
NH 0.06
0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
+ -1 Figure 209 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS12 (Perth Airport North).
178 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
1.0 SCCIS12 (PAN - LIMESTONE CK) NOx-N
2013-2017 data 0.8 2018 data )
-1 0.6
0.4 NOx-N (mg L
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 210 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS12 (Perth Airport North).
1.2 SCCIS12 (PAN - LIMESTONE CK) DOrgN
2013-2017 data 1.0 2018 data
0.8 ) -1
0.6 DOrgN(mg L 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 211 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS12 (Perth Airport North).
Department of Water and Environmental Regulation 179 Swan Canning Catchment Data Report January - December 2018
The 90th Percentile for Jan was 0.20 mg.L-1 0.10 SCCIS12 (PAN - LIMESTONE CK) TP
0.08
) 0.06 -1
TP(mg L 0.04
0.02
2013-2017 data 2018 data 0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 212 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS12 (Perth Airport North).
0.035 SCCIS12 (PAN - LIMESTONE CK) FRP 2013-2017 data 2018 data 0.030
0.025 ) -1 0.020
0.015 FRP(mg L
0.010
0.005
0.000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 213 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS12 (Perth Airport North).
180 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
The 90th Percentile for Jan was 33 mg.L-1 20 SCCIS12 (PAN - LIMESTONE CK) DOC
15 ) -1
10 DOC(mg L
5
2013-2017 data 2018 data
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 214 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS12 (Perth Airport North).
60 SCCIS12 (PAN - LIMESTONE CK) TSS
2013-2017 data 50 2018 data
40 ) -1
30 TSS(mg L
20
10
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 215 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS12 (Perth Airport North).
Department of Water and Environmental Regulation 181 Swan Canning Catchment Data Report January - December 2018
14 SCCIS12 (PAN - LIMESTONE CK) DO
12
10 )
-1 8
6 DO(mg L
4
2 2013-2017 data 2018 data
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 216 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS12 (Perth Airport North).
1.0 SCCIS12 (PAN - LIMESTONE CK) Sp. Conductivity
0.8 ) -1 0.6
0.4 Sp.Cond (mS cm
0.2
2013-2017 data 2018 data
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=12 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 217 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS12 (Perth Airport North).
182 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 24 2018 monthly sample numbers, minimum and maximum values at SCCIS12 (Perth Airport North).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.45 0.41 0.41 0.95 0.44 0.37 0.64 0.65 0.84 0.40 0.50 0.51 max 0.81 0.52 0.68 1.10 0.47 0.61 0.84 1.00 0.88 0.72 0.52 0.55 med 0.53 0.47 0.55 1.03 0.46 0.49 0.74 0.82 0.86 0.56 0.51 0.53
-1 NH3-N (mg.L ) n 3 2 2 2 2 2 2 3 2 2 2 2 min <0.01 0.038 0.029 0.035 0.032 0.020 0.022 0.016 0.023 0.014 0.011 0.022 max 0.040 0.047 0.029 0.065 0.037 0.027 0.039 0.021 0.023 0.031 0.022 0.026 med 0.029 0.043 0.029 0.050 0.035 0.024 0.031 0.019 0.023 0.023 0.017 0.024
-1 NOx-N (mg.L ) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.017 0.044 0.039 0.065 0.087 0.029 0.220 0.190 0.270 0.072 0.073 0.038 max 0.230 0.044 0.042 0.069 0.088 0.150 0.410 0.410 0.370 0.250 0.075 0.053 med 0.073 0.044 0.041 0.067 0.088 0.090 0.315 0.230 0.320 0.161 0.074 0.046 DOrgN (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.31 0.33 0.29 0.48 0.26 0.20 0.36 0.25 0.44 0.31 0.39 0.42 max 0.49 0.36 0.38 0.58 0.28 0.32 0.40 0.52 0.59 0.44 0.44 0.42 med 0.40 0.35 0.34 0.53 0.27 0.26 0.38 0.35 0.52 0.38 0.42 0.42 TP (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.027 0.026 0.020 0.022 0.015 0.016 0.017 0.025 0.011 0.017 0.010 0.017 max 0.043 0.027 0.049 0.084 0.026 0.035 0.022 0.032 0.026 0.017 0.012 0.022 med 0.028 0.027 0.035 0.053 0.021 0.026 0.020 0.028 0.019 0.017 0.011 0.020 FRP (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.008 <0.005 0.015 0.010 0.011 <0.005 0.008 0.008 <0.005 0.006 <0.005 0.007 max 0.013 0.009 0.020 0.011 0.016 0.011 0.011 0.011 0.009 0.012 <0.005 0.008 med 0.011 0.006 0.018 0.011 0.014 0.007 0.010 0.010 0.006 0.009 <0.005 0.008 DOC (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 9 8 8 9 8 5 9 9 12 12 10 11 max 12 9 9 13 8 9 13 12 14 13 11 11 med 9 8.5 8.5 11 8 7 11 9 13 12.5 10.5 11 TSS (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 6 5 7 14 6 11 2 2 2 3 3 5 max 10 6 32 101 16 12 6 10 3 3 4 5 med 9 5.5 19.5 57.5 11 11.5 4 8 2.5 3 3.5 5
Department of Water and Environmental Regulation 183 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 4.88 6.80 5.03 7.13 8.61 8.72 8.71 8.75 10.11 9.39 9.75 8.55 max 7.43 6.95 6.21 7.17 8.72 8.77 9.10 10.22 10.21 9.75 10.59 8.60 med 5.94 6.88 5.62 7.15 8.67 8.75 8.91 9.35 10.16 9.57 10.17 8.58 Sp. Conductivity (mS.cm-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.304 0.690 0.689 0.601 0.567 0.137 0.305 0.245 0.561 0.610 0.619 0.575 max 0.706 0.735 0.708 0.782 0.602 0.341 0.466 0.441 0.721 0.669 0.638 0.598 med 0.664 0.713 0.699 0.692 0.585 0.239 0.386 0.290 0.641 0.640 0.629 0.587
Perth Airport North main drain (Limestone Creek) is not a gauged catchment, so no hydrograph is available. The 2018 data followed the background data with the only exception being a spike in total nitrogen and total phosphorus that correlated with a spike in total suspended solids in April 2018, largely due to the sample collected 11th April 2018. The field comments that day noted “high turbidity and low flow” at the site and that the water appeared “murky”. Despite the spike in particulate based phosphorus in April the actual concentration of phosphorus remained low, but variable, throughout the year. Total nitrogen concentrations were generally moderately low over the year but are highest (with the greatest variability) over winter; largely due to the influence of total oxidised nitrogen concentrations which showed a typical seasonal response to winter rainfall and surface run off.
184 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
22 Perth Airport South (KANAV)
2.5 KANAV (PERTH AIRPORT SOUTH) TN
2.0
) 1.5 -1
TN(mg L 1.0
0.5
2013-2017 data 2018 data
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=10 n=12 n=9 n=11 n=9 n=10 n=12 n=11 n=12 n=10 n=9
Figure 218 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site KANAV (Perth Airport South).
0.30
KANAV (PERTH AIRPORT SOUTH) NH3-N
0.25 2013-2017 data 2018 data
0.20 ) -1
0.15 -N(mg L 3 NH 0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=10 n=12 n=9 n=11 n=9 n=10 n=12 n=11 n=12 n=10 n=9
+ -1 Figure 219 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site KANAV (Perth Airport South).
Department of Water and Environmental Regulation 185 Swan Canning Catchment Data Report January - December 2018
1.4 KANAV (PERTH AIRPORT SOUTH) NOx-N
1.2 2013-2017 data 2018 data
1.0 ) -1 0.8
0.6 NOx-N(mg L
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=10 n=12 n=9 n=11 n=9 n=10 n=12 n=11 n=12 n=10 n=9
Figure 220 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at KANAV (Perth Airport South).
1.6 KANAV (PERTH AIRPORT SOUTH) DOrgN
1.4 2013-2017 data 2018 data 1.2
) 1.0 -1
0.8
DOrgN(mg L 0.6
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=10 n=12 n=9 n=11 n=9 n=10 n=12 n=11 n=12 n=10 n=9
Figure 221 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at KANAV (Perth Airport South).
186 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
0.25 KANAV (PERTH AIRPORT SOUTH) TP
2013-2017 data 0.20 2018 data
) 0.15 -1
TP(mg L 0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=10 n=12 n=9 n=11 n=9 n=10 n=12 n=11 n=12 n=10 n=9
Figure 222 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site KANAV (Perth Airport South).
0.10 KANAV (PERTH AIRPORT SOUTH) FRP
2013-2017 data 0.08 2018 data
) 0.06 -1
FRP(mg L 0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=10 n=12 n=9 n=11 n=9 n=10 n=12 n=11 n=12 n=10 n=9
Figure 223 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at KANAV (Perth Airport South).
Department of Water and Environmental Regulation 187 Swan Canning Catchment Data Report January - December 2018
35 KANAV (PERTH AIRPORT SOUTH) DOC
30
25 ) -1 20
15 DOC(mg L
10
5 2013-2017 data 2018 data
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=10 n=12 n=9 n=11 n=9 n=10 n=12 n=11 n=12 n=10 n=9
Figure 224 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at KANAV (Perth Airport South).
The 90th Percentile for The 90th Percentile for Jul was 127 mg.L-1 Aug was 123 mg.L-1 80 KANAV (PERTH AIRPORT SOUTH) TSS 2013-2017 data 2018 data
60 ) -1
40 TSS(mg L
20
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=10 n=12 n=9 n=11 n=9 n=10 n=12 n=11 n=12 n=10 n=9
Figure 225 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site KANAV (Perth Airport South).
188 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
12 KANAV (PERTH AIRPORT SOUTH) DO
10
8 ) -1
6 DO(mg L
4
2 2013-2017 data 2018 data
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=10 n=12 n=9 n=11 n=9 n=10 n=12 n=11 n=12 n=10 n=9
Figure 226 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site KANAV (Perth Airport South).
1.0 KANAV (PERTH AIRPORT SOUTH) Sp. Conductivity
0.8 ) -1 0.6
0.4 Sp.Cond (mS cm
0.2
2013-2017 data 2018 data 0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=10 n=12 n=9 n=11 n=9 n=10 n=12 n=11 n=12 n=10 n=9
Figure 227 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site KANAV (Perth Airport South).
Department of Water and Environmental Regulation 189 Swan Canning Catchment Data Report January - December 2018
Table 25 2018 monthly sample numbers, minimum and maximum values at KANAV (Perth Airport South).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 3 2 1 2 2 2 2 3 2 2 2 2 min 0.99 1.00 2.20 1.00 1.10 0.63 0.71 0.69 1.10 0.59 0.87 0.86 max 1.00 1.10 2.20 1.10 1.30 0.94 0.95 1.00 1.10 0.93 0.88 0.92 med 1.00 1.05 2.20 1.05 1.20 0.79 0.83 0.91 1.10 0.76 0.88 0.89
-1 NH3-N (mg.L ) n 3 2 1 2 2 2 2 3 2 2 2 2 min 0.012 0.041 0.230 0.048 0.150 0.032 0.060 0.029 0.036 0.020 0.034 0.026 max 0.032 0.120 0.230 0.100 0.160 0.045 0.130 0.044 0.040 0.041 0.035 0.029 med 0.026 0.081 0.230 0.074 0.155 0.039 0.095 0.034 0.038 0.031 0.035 0.028
-1 NOx-N (mg.L ) n 3 2 1 2 2 2 2 3 2 2 2 2 min 0.051 0.082 0.290 0.180 0.230 0.110 0.200 0.240 0.340 0.130 0.110 0.053 max 0.100 0.190 0.290 0.210 0.260 0.230 0.390 0.350 0.400 0.260 0.120 0.084 med 0.089 0.136 0.290 0.195 0.245 0.170 0.295 0.250 0.370 0.195 0.115 0.069 DOrgN (mg.L-1) n 3 2 1 2 2 2 2 3 2 2 2 2 min 0.49 0.70 1.10 0.73 0.68 0.29 0.24 0.32 0.64 0.30 0.71 0.75 max 0.86 0.81 1.10 0.77 0.71 0.39 0.47 0.54 0.67 0.59 0.74 0.77 med 0.83 0.76 1.10 0.75 0.70 0.34 0.36 0.34 0.66 0.45 0.73 0.76 TP (mg.L-1) n 3 2 1 2 2 2 2 3 2 2 2 2 min 0.026 0.029 0.230 0.026 0.026 0.052 0.033 0.039 0.019 0.020 0.012 0.020 max 0.130 0.029 0.230 0.036 0.079 0.075 0.066 0.049 0.033 0.023 0.015 0.026 med 0.026 0.029 0.230 0.031 0.053 0.064 0.050 0.039 0.026 0.022 0.014 0.023 FRP (mg.L-1) n 3 2 1 2 2 2 2 3 2 2 2 2 min 0.013 0.005 0.095 0.014 0.025 0.017 0.017 0.009 0.010 0.009 0.005 0.009 max 0.032 0.010 0.095 0.022 0.042 0.026 0.020 0.019 0.014 0.013 0.007 0.012 med 0.015 0.008 0.095 0.018 0.034 0.022 0.019 0.013 0.012 0.011 0.006 0.011 DOC (mg.L-1) n 3 2 1 2 2 2 2 3 2 2 2 2 min 12 24 28 24 24 5 9 9 18 20 20 26 max 29 28 28 26 26 13 17 15 22 21 25 27 med 26 26 28 25 25 9 13 12 20 20.5 22.5 26.5 TSS (mg.L-1) n 3 2 1 2 2 2 2 3 2 2 2 2 min 5 6 37 6 2 6 2 5 4 5 5 4 max 27 8 37 13 27 12 25 11 4 5 8 4 med 8 7 37 9.5 14.5 9 13.5 11 4 5 6.5 4
190 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 3 2 1 2 2 2 2 3 2 2 2 2 min 6.72 8.19 7.83 9.31 9.38 9.58 9.66 9.42 10.27 9.50 9.92 9.67 max 7.05 8.57 7.83 9.39 9.48 10.04 9.71 9.50 10.49 10.35 10.18 9.68 med 6.75 8.38 7.83 9.35 9.43 9.81 9.69 9.45 10.38 9.93 10.05 9.68 Sp. Conductivity (mS.cm-1) n 3 2 1 2 2 2 2 3 2 2 2 2 min 0.211 0.664 0.686 0.741 0.767 0.143 0.207 0.267 0.485 0.539 0.617 0.665 max 0.691 0.741 0.686 0.752 0.788 0.366 0.453 0.363 0.591 0.569 0.653 0.685 med 0.666 0.703 0.686 0.747 0.778 0.255 0.330 0.304 0.538 0.554 0.635 0.675
Perth Airport South is an ungauged catchment. The 2018 data generally followed the background data, much of which is itself highly variable; although this may be in part due to the moving of the site in the catchment to the downstream side of Great Eastern Highway as well as the in-stream works to pipe the drain in the later part of 2016. The one notable departure from the background data in 2018 was during March when concentrations of total nitrogen, ammoniacal nitrogen, dissolved organic nitrogen, total phosphorus, filterable reactive phosphorus and total suspended solids were all relatively elevated. This is predominantly due to the fact the data point represents only one sample collected at the site during March; and that sample (collected on 11th March 2018) recorded the highest concentrations of total nitrogen, dissolved organic nitrogen, total phosphorus and total suspended solids for the entire year.
Department of Water and Environmental Regulation 191 Swan Canning Catchment Data Report January - December 2018
23 St Leonard’s Creek (SCCIN3)
5 SCCIN3 (ST LEONARD'S CK) TN
2013-2017 data 4 2018 data
) 3 -1
TN (mgL 2
1
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=5 n=10 n=10 n=9 n=0 n=0
Figure 228 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIN3 (St Leonard’s Ck).
0.18
SCCIN3 (ST LEONARD'S CK) NH3-N 2013-2017 data 0.16 2018 data
0.14
0.12 ) -1 0.10 -N(mg L
3 0.08 NH 0.06
0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=5 n=10 n=10 n=9 n=0 n=0
+ -1 Figure 229 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIN3 (St Leonard’s Ck).
192 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
0.4 SCCIN3 (ST LEONARD'S CK) NOx-N
2013-2017 data 2018 data 0.3 ) -1
0.2 NOx-N(mg L
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=5 n=10 n=10 n=9 n=0 n=0
Figure 230 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIN3 (St Leonard’s Ck).
5 SCCIN3 (ST LEONARD'S CK) DOrgN
2013-2017 data 4 2018 data )
-1 3
2 DOrgN(mg L
1
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=5 n=10 n=10 n=9 n=0 n=0
Figure 231 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIN3 (St Leonard’s Ck).
Department of Water and Environmental Regulation 193 Swan Canning Catchment Data Report January - December 2018
0.4 SCCIN3 (ST LEONARD'S CK) TP 2013-2017 data 2018 data
0.3 ) -1
0.2 TP(mg L
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=5 n=10 n=10 n=9 n=0 n=0
Figure 232 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIN3 (St Leonard’s Ck).
0.14 SCCIN3 (ST LEONARD'S CK) FRP
0.12 2013-2017 data 2018 data
0.10 ) -1 0.08
0.06 FRP(mg L
0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=5 n=10 n=10 n=9 n=0 n=0
Figure 233 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013- 2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIN3 (St Leonard’s Ck).
194 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
100 SCCIN3 (ST LEONARD'S CK) DOC
2013-2017 data 80 2018 data
) 60 -1
DOC(mg L 40
20
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=5 n=10 n=10 n=9 n=0 n=0
Figure 234 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIN3 (St Leonard’s Ck).
30 SCCIN3 (ST LEONARD'S CK) TSS 2013-2017 data 2018 data 25
20 ) -1
15 TSS(mg L
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=5 n=10 n=10 n=9 n=0 n=0
Figure 235 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIN3 (St Leonard’s Ck).
Department of Water and Environmental Regulation 195 Swan Canning Catchment Data Report January - December 2018
10 SCCIN3 (ST LEONARD'S CK) DO
2013-2017 data 8 2018 data
) 6 -1
DO(mg L 4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=5 n=10 n=10 n=9 n=0 n=0
Figure 236 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIN3 (St Leonard’s Ck).
1.6 SCCIN3 (ST LEONARD'S CK) Sp. Conductivity 1.4 2013-2017 data 2018 data 1.2 ) -1 1.0
0.8
0.6 Sp.Cond (mS cm
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=1 n=5 n=10 n=10 n=9 n=0 n=0
Figure 237 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIN3 (St Leonard’s Ck).
196 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 26 2018 monthly sample numbers, minimum and maximum values at SCCIN3 (St Leonard’s Ck).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 0 0 0 0 0 1 2 3 2 2 0 0 min - - - - - 1.10 2.60 2.90 2.10 2.20 - - max - - - - - 1.10 2.90 3.10 2.40 2.20 - - med - - - - - 1.10 2.75 3.00 2.25 2.20 - -
-1 NH3-N (mg.L ) n 0 0 0 0 0 1 2 3 2 2 0 0 min - - - - - 0.045 0.055 0.051 0.046 0.038 - - max - - - - - 0.045 0.061 0.069 0.062 0.048 - - med - - - - - 0.045 0.058 0.061 0.054 0.043 - -
-1 NOx-N (mg.L ) n 0 0 0 0 0 1 2 3 2 2 0 0 min - - - - - 0.010 0.100 0.110 0.043 0.027 - - max - - - - - 0.010 0.110 0.180 0.110 0.041 - - med - - - - - 0.010 0.105 0.170 0.077 0.034 - - DOrgN (mg.L-1) n 0 0 0 0 0 1 2 3 2 2 0 0 min - - - - - 0.72 2.40 2.40 2.00 1.80 - - max - - - - - 0.72 2.70 2.80 2.20 2.10 - - med - - - - - 0.72 2.55 2.70 2.10 1.95 - - TP (mg.L-1) n 0 0 0 0 0 1 2 3 2 2 0 0 min - - - - - 0.160 0.072 0.092 0.080 0.079 - - max - - - - - 0.160 0.086 0.140 0.100 0.090 - - med - - - - - 0.160 0.079 0.140 0.090 0.085 - - FRP (mg.L-1) n 0 0 0 0 0 1 2 3 2 2 0 0 min - - - - - 0.053 0.026 0.037 0.042 0.049 - - max - - - - - 0.053 0.041 0.071 0.051 0.060 - - med - - - - - 0.053 0.034 0.060 0.047 0.055 - - DOC (mg.L-1) n 0 0 0 0 0 1 2 3 2 2 0 0 min - - - - - 18 58 59 50 53 - - max - - - - - 18 62 62 55 54 - - med - - - - - 18 60 61 52.5 53.5 - - TSS (mg.L-1) n 0 0 0 0 0 1 2 3 2 2 0 0 min - - - - - 15 2 5 3 3 - - max - - - - - 15 3 8 5 3 - - med - - - - - 15 2.5 8 4 3 - -
Department of Water and Environmental Regulation 197 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 0 0 0 0 0 1 2 3 2 2 0 0 min - - - - - 6.63 7.54 8.10 8.03 6.99 - - max - - - - - 6.63 7.82 9.22 8.55 7.24 - - med - - - - - 6.63 7.68 8.80 8.29 7.12 - - Sp. Conductivity (mS.cm-1) n 0 0 0 0 0 1 2 3 2 2 0 0 min - - - - - 0.659 0.878 0.640 0.795 0.910 - - max - - - - - 0.659 0.885 0.819 0.915 0.920 - - med - - - - - 0.659 0.882 0.692 0.855 0.915 - -
St Leonard’s Creek is an ungauged catchment, so there was no flow data. It is an ephemeral system which normally only flows during winter and spring in response to rainfall, as was the case in 2018 with just ten samples collected over the year between mid-June and the end of October. The 2018 data at this site and the background data were both highly variable but total nitrogen (the majority of which is in the form of dissolved organic nitrogen) and dissolved organic carbon concentrations are very high in absolute terms even if they appear lower relative to the background data. While the nutrient concentrations are of concern the catchment only flows for a few months over winter. With no flow data it is impossible to quantify the contributions of nitrogen, and phosphorus to a lesser extent, to the Upper Swan Estuary from this catchment.
198 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
24 South Belmont Main Drain (SWS13)
2.0
SWS13 (S.BELMONT) TN 2013-2017 data 2018 data
1.5 ) -1
1.0 TN(mg L
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 238 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS13 (S. Belmont MD).
0.20
SWS13 (S.BELMONT) NH3-N
2013-2017 data 2018 data 0.15 ) -1
0.10 -N(mg L 3 NH
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
+ -1 Figure 239 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS13 (S. Belmont MD).
Department of Water and Environmental Regulation 199 Swan Canning Catchment Data Report January - December 2018
0.6
SWS13 (S.BELMONT) NOx-N 2013-2017 data 2018 data 0.5
0.4 ) -1
0.3 NOx-N(mg L 0.2
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 240 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS13 (S. Belmont MD).
1.2 SWS13 (S.BELMONT) DOrgN
2013-2017 data 1.0 2018 data
0.8 ) -1
0.6 DOrgN(mg L 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 241 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS13 (S. Belmont MD).
200 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
0.5 SWS13 (S.BELMONT) TP 2013-2017 data 2018 data
0.4
) 0.3 -1
TP(mg L 0.2
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 242 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS13 (S. Belmont MD).
0.30 SWS13 (S.BELMONT) FRP
2013-2017 data 0.25 2018 data
0.20 ) -1
0.15 FRP(mg L
0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 243 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS13 (S. Belmont MD).
Department of Water and Environmental Regulation 201 Swan Canning Catchment Data Report January - December 2018
25 SWS13 (S.BELMONT) DOC 2013-2017 data 2018 data
20
) 15 -1
DOC(mg L 10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 244 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS13 (S. Belmont MD). The 90th Percentile for The 90th Percentile for Jul was 51 mg.L-1 Nov was 29 mg.L-1 20 SWS13 (S.BELMONT) TSS
2013-2017 data 2018 data 15 ) -1
10 TSS(mg L
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 245 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS13 (S. Belmont MD).
202 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
12 SWS13 (S.BELMONT) DO 2013-2017 data 2018 data 10
8 ) -1
6 DO(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=10 n=11 n=11 n=12 n=10 n=10 n=10 n=12 n=12
Figure 246 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS13 (S. Belmont MD).
1.2
SWS13 (S.BELMONT) Sp. Conductivity 2013-2017 data 2018 data 1.0
) 0.8 -1
0.6
Sp.Cond (mS cm 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 247 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS13 (S. Belmont MD).
Department of Water and Environmental Regulation 203 Swan Canning Catchment Data Report January - December 2018
South Belmont MD (Cleaver Terrace) 2018 flow 50 45 40 35 30 25 20 15
Daily discharge (ML) discharge Daily 10 5 0
Data
Figure 248 2018 S. Belmont MD flow at Cleaver Terrace (6160133) – Daily discharge hydrograph measured in megalitres.
Please note: flow data is from the Cleaver Terrace gauging station (616133) which is approximately 0.5 Km upstream of site SWS13 where the nutrient data is collected for the SWANCATCH project. The monitoring equipment was vandalised which resulted in a loss of data from 11th to 29th August 2018, producing the gap seem in the hydrograph above. The data is still indicative of the nature of flow at the site over the year and captured the catchment response to the unseasonable rainfall event during mid-January.
204 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 27 2018 monthly sample numbers, minimum and maximum values at SWS13 (S. Belmont MD).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.83 0.85 0.78 0.83 0.69 0.34 1.00 1.20 1.20 0.81 0.78 0.89 max 0.98 0.85 0.85 1.10 0.80 0.86 1.10 1.30 1.80 0.99 0.85 0.95 med 0.91 0.85 0.82 0.97 0.79 0.60 1.05 1.25 1.50 0.82 0.82 0.92
-1 NH3-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.054 0.062 0.065 0.074 0.080 0.045 0.083 0.055 0.030 0.036 0.033 0.080 max 0.072 0.074 0.075 0.086 0.130 0.100 0.089 0.088 0.064 0.046 0.061 0.087 med 0.063 0.068 0.070 0.080 0.081 0.073 0.086 0.072 0.047 0.043 0.047 0.084
-1 NOx-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.050 0.092 0.140 0.190 0.091 0.069 0.230 0.400 0.250 0.065 0.077 0.110 max 0.060 0.099 0.140 0.230 0.170 0.130 0.250 0.440 0.460 0.140 0.077 0.150 med 0.055 0.096 0.140 0.210 0.170 0.100 0.240 0.420 0.355 0.090 0.077 0.130 DOrgN (mg.L-1) n 2 2 2 2 3 2 2 2 1 3 2 2 min 0.65 0.58 0.47 0.50 0.43 0.23 0.67 0.74 0.68 0.63 0.55 0.62 max 0.75 0.63 0.56 0.56 0.55 0.62 0.72 0.77 0.68 0.71 0.64 0.66 med 0.70 0.61 0.52 0.53 0.50 0.43 0.70 0.76 0.68 0.63 0.60 0.64 TP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.200 0.210 0.170 0.170 0.130 0.063 0.150 0.180 0.140 0.160 0.190 0.210 max 0.400 0.310 0.220 0.180 0.170 0.110 0.170 0.190 0.200 0.210 0.190 0.230 med 0.300 0.260 0.195 0.175 0.130 0.087 0.160 0.185 0.170 0.170 0.190 0.220 FRP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.140 0.140 0.130 0.110 0.081 0.025 0.110 0.150 0.130 0.120 0.140 0.130 max 0.270 0.200 0.140 0.110 0.110 0.075 0.120 0.150 0.150 0.160 0.150 0.150 med 0.205 0.170 0.135 0.110 0.089 0.050 0.115 0.150 0.140 0.130 0.145 0.140 DOC (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 17 16 13 14 12 3 15 17 17 18 15 18 max 18 16 14 17 13 13 17 18 18 18 18 18 med 17.5 16 13.5 15.5 13 8 16 17.5 17.5 18 16.5 18 TSS (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 3 4 2 5 2 2 1 <1 <1 <1 3 3 max 5 8 5 7 5 2 1 2 <1 3 3 9 med 4 6 3.5 6 3 2 1 1.3 <1 <1 3 6
Department of Water and Environmental Regulation 205 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 5.55 5.83 5.98 5.57 6.17 8.31 8.62 8.85 9.13 7.73 7.23 6.77 max 6.58 6.83 5.99 6.22 7.82 9.44 8.80 9.02 9.19 8.47 7.71 7.11 med 6.07 6.33 5.99 5.90 6.41 8.88 8.71 8.94 9.16 8.13 7.47 6.94 Sp. Conductivity (mS.cm-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.735 0.736 0.699 0.511 0.612 0.130 0.731 0.711 0.675 0.727 0.745 0.732 max 0.765 0.759 0.715 0.669 0.681 0.622 0.760 0.712 0.754 0.766 0.782 0.740 med 0.750 0.748 0.707 0.590 0.670 0.376 0.746 0.712 0.715 0.745 0.764 0.736
South Belmont main drain 2018 data was varied and departed from the background data for several parameters at various times of the year. Total nitrogen was relatively elevated during the early part of the year and again during late winter to spring. This was due to a combination of elevated dissolved organic nitrogen and total oxidised nitrogen over the same periods. Total phosphorus concentrations were higher and elevated compared to the background data at the beginning and end of the year with the lowest recorded concentrations being in June. This was largely driven by filterable reactive phosphorus concentrations, which showed a similar pattern throughout the year. Dissolved organic carbon and total suspended solids data were both varied but the background data is also highly variable. Looking at the raw data there isn’t any single sample (collected during storm flows for example) that particularly influenced the monthly median data point (which is generally calculated on just two data points), rather it is a case of the data collected just generally being elevated during the periods mentioned. The relatively elevated concentrations of filterable reactive phosphorus over the year are interesting considering the falling performance of this catchment in recent years against the long term phosphorus target.
206 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
25 South Perth (SCCIS1)
1.6 SCCIS1 (S.PERTH) TN 1.4 2013-2017 data 2018 data 1.2
1.0 ) -1
0.8 TN(mg L 0.6
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=8 n=10 n=11 n=11 n=11 n=10 n=10 n=12 n=11 n=12 n=9 n=10
Figure 249 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS1 (S. Perth).
0.8 SCCIS1 (S.PERTH) NH -N 3 2013-2017 data 2018 data
0.6 ) -1
0.4 -N(mg L 3 NH
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=8 n=10 n=11 n=11 n=11 n=10 n=10 n=12 n=11 n=12 n=9 n=10
+ -1 Figure 250 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS1 (S. Perth).
Department of Water and Environmental Regulation 207 Swan Canning Catchment Data Report January - December 2018
0.5 SCCIS1 (S.PERTH) NOx-N
2013-2017 data 0.4 2018 data )
-1 0.3
0.2 NOx-N(mg L
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=8 n=10 n=11 n=11 n=11 n=10 n=10 n=12 n=11 n=12 n=9 n=10
Figure 251 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS1 (S. Perth).
0.8
SCCIS1 (S.PERTH) DOrgN 2013-2017 data 2018 data
0.6 ) -1
0.4 DOrgN(mg L
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=8 n=10 n=11 n=11 n=11 n=10 n=10 n=12 n=11 n=12 n=9 n=10
Figure 252 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS1 (S. Perth).
208 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
0.06 SCCIS1 (S.PERTH) TP 2013-2017 data 2018 data 0.05
0.04 ) -1
0.03 TP(mg L
0.02
0.01
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=8 n=10 n=11 n=11 n=11 n=10 n=10 n=12 n=11 n=12 n=9 n=10
Figure 253 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS1 (S. Perth).
0.020 SCCIS1 (S.PERTH) FRP
2013-2017 data 2018 data 0.015 ) -1
0.010 FRP(mg L
0.005
0.000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=8 n=10 n=11 n=11 n=11 n=10 n=10 n=12 n=11 n=12 n=9 n=10
Figure 254 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS1 (S. Perth).
Department of Water and Environmental Regulation 209 Swan Canning Catchment Data Report January - December 2018
18 SCCIS1 (S.PERTH) DOC 16
14
12 ) -1 10
8 DOC(mg L
6
4
2 2013-2017 data 2018 data
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=8 n=10 n=11 n=11 n=11 n=10 n=10 n=12 n=11 n=12 n=9 n=10
Figure 255 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SCCIS1 (S. Perth).
The 90th Percentile for Jun was 42 mg.L-1 30 SCCIS1 (S.PERTH) TSS
2013-2017 data 25 2018 data
20 ) -1
15 TSS(mg L
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=8 n=10 n=11 n=11 n=11 n=10 n=10 n=12 n=11 n=12 n=9 n=10
Figure 256 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS1 (S. Perth).
210 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
8 SCCIS1 (S.PERTH) DO
2013-2017 data 2018 data 6 ) -1
4 DO(mg L
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=7 n=10 n=11 n=11 n=11 n=10 n=10 n=12 n=11 n=12 n=9 n=10
Figure 257 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS1 (S. Perth).
0.8 SCCIS1 (S.PERTH) Sp. Conductivity
0.6 ) -1
0.4 Sp.Cond (mS cm
0.2
2013-2017 data 2018 data 0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=7 n=10 n=11 n=11 n=11 n=10 n=10 n=12 n=11 n=12 n=9 n=10
Figure 258 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SCCIS1 (S. Perth).
Department of Water and Environmental Regulation 211 Swan Canning Catchment Data Report January - December 2018
Table 28 2018 monthly sample numbers, minimum and maximum values at SCCIS1 (S. Perth).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.49 0.55 1.10 0.94 0.74 0.37 0.77 0.58 0.64 0.63 0.43 0.54 max 0.92 0.60 1.10 1.30 1.00 0.63 0.84 0.76 0.68 0.64 0.49 0.58 med 0.70 0.58 1.10 1.12 0.87 0.50 0.81 0.72 0.66 0.64 0.46 0.56
-1 NH3-N (mg.L ) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.039 0.059 0.320 0.460 0.250 0.090 0.100 0.061 0.086 0.078 0.018 0.035 max 0.110 0.096 0.540 0.610 0.370 0.180 0.140 0.099 0.110 0.120 0.034 0.066 med 0.051 0.078 0.430 0.535 0.310 0.135 0.120 0.076 0.098 0.099 0.026 0.051
-1 NOx-N (mg.L ) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.013 0.010 0.030 0.035 0.062 0.054 0.190 0.031 0.071 0.088 <0.01 <0.01 max 0.200 0.020 0.038 0.059 0.084 0.190 0.210 0.230 0.077 0.110 0.039 <0.01 med 0.014 0.015 0.034 0.047 0.073 0.122 0.200 0.210 0.074 0.099 0.022 <0.01 DOrgN (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.36 0.41 0.38 0.24 0.28 0.23 0.38 0.31 0.45 0.07 0.39 0.36 max 0.52 0.44 0.45 0.44 0.34 0.25 0.45 0.46 0.47 0.40 0.39 0.41 med 0.42 0.43 0.42 0.34 0.31 0.24 0.42 0.40 0.46 0.24 0.39 0.39 TP (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.018 0.021 0.018 0.020 0.020 0.019 0.014 0.011 <0.005 0.009 <0.005 0.012 max 0.029 0.021 0.032 0.026 0.025 0.025 0.016 0.022 0.008 0.015 <0.005 0.013 med 0.026 0.021 0.025 0.023 0.023 0.022 0.015 0.013 0.005 0.012 <0.005 0.013 FRP (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 max 0.009 0.003 0.011 0.003 0.006 0.003 0.010 0.011 0.003 0.009 0.003 0.006 med 0.003 0.003 0.007 0.003 0.004 0.003 0.006 0.003 0.003 0.006 0.003 0.004 DOC (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 12 10 9 8 9 6 11 12 14 13 11 13 max 13 12 11 11 9 9 12 12 14 13 12 13 med 13 11 10 9.5 9 7.5 11.5 12 14 13 11.5 13 TSS (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 7 8 11 11 11 7 3 1 1 2 2 4 max 14 10 15 11 11 8 4 9 2 5 4 5 med 10 9 13 11 11 7.5 3.5 2 1.5 3.5 3 4.5
212 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 1.86 2.76 2.26 0.30 0.28 5.01 5.65 4.66 3.65 3.58 3.36 1.86 max 3.13 3.93 2.64 3.32 5.01 6.29 6.14 6.18 4.16 4.46 4.13 3.04 med 2.61 3.35 2.45 1.81 2.65 5.65 5.90 4.93 3.91 4.02 3.75 2.45 Sp. Conductivity (mS.cm-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.414 0.502 0.524 0.511 0.501 0.203 0.417 0.400 0.523 0.525 0.525 0.544 max 0.655 0.518 0.632 0.526 0.564 0.384 0.473 0.441 0.550 0.536 0.534 0.557 med 0.532 0.510 0.578 0.519 0.533 0.294 0.445 0.438 0.537 0.531 0.530 0.551
The South Perth catchment is ungauged. The 2018 data for this site followed the background data with the exception of total nitrogen, ammoniacal nitrogen and dissolved organic nitrogen which were all lower than the background data during June, as was dissolved organic nitrogen again in October. In all cases however the natural variability in the background data is moderately high. Total phosphorus concentrations displayed variability towards the end of 2018 but overall, concentrations were low and variability (in past data) was relatively high; but this is partly a function of the low concentrations recorded in the catchment. The total nitrogen concentrations in the catchment were moderately variable but interestingly were unusually strongly influenced by ammoniacal nitrogen, particularly during autumn to early winter. Total oxidised nitrogen concentrations were relatively low but clearly peaked in winter with inputs from surface run off. There wasn’t any discernible pattern in phosphorous concentrations in the catchment in 2018 but concentrations, in absolute terms, were very low.
Department of Water and Environmental Regulation 213 Swan Canning Catchment Data Report January - December 2018
26 South Perth (WIFRD)
3.5 WIFRD (S.PERTH - WILSON MD) TN
3.0
2.5 )
-1 2.0
1.5 TN (mgL
1.0
0.5 2013-2017 data 2018 data
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=5 n=3 n=6 n=7 n=9 n=9 n=11 n=11 n=12 n=9 n=6
Figure 259 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WIFRD (S. Perth).
The 90th Percentile for The 90th Percentile for Jun was 0.51 mg.L-1 Oct was 0.61 mg.L-1 0.30
WIFRD (S.PERTH - WILSON MD) NH3-N
2013-2017 data 0.25 2018 data
0.20 ) -1
0.15 -N(mg L 3 NH 0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=5 n=3 n=6 n=7 n=9 n=9 n=11 n=11 n=12 n=9 n=6
+ -1 Figure 260 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WIFRD (S. Perth).
214 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
1.4
WIFRD (S.PERTH - WILSON MD) NOx-N 2013-2017 data 2018 data 1.2
1.0 ) -1 0.8
0.6 NOx-N(mg L
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=5 n=3 n=6 n=7 n=9 n=9 n=11 n=11 n=12 n=9 n=6
Figure 261 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WIFRD (S. Perth).
1.8 WIFRD (S.PERTH - WILSON MD) DOrgN 1.6
1.4
1.2 ) -1 1.0
0.8 DOrgN(mg L 0.6
0.4
0.2 2013-2017 data 2018 data
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=5 n=3 n=6 n=7 n=9 n=9 n=11 n=11 n=12 n=9 n=6
Figure 262 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WIFRD (S. Perth).
Department of Water and Environmental Regulation 215 Swan Canning Catchment Data Report January - December 2018
The 90th Percentile for Oct was 0.41 mg.L-1 0.35 WIFRD (S.PERTH - WILSON MD) TP
0.30
0.25 )
-1 0.20
0.15 TP(mg L
0.10
0.05 2013-2017 data 2018 data 0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=5 n=3 n=6 n=7 n=9 n=9 n=11 n=11 n=12 n=9 n=6
Figure 263 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WIFRD (S. Perth).
0.30 WIFRD (S.PERTH - WILSON MD) FRP
0.25 2013-2017 data 2018 data
0.20 ) -1
0.15 FRP(mg L
0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=5 n=3 n=6 n=7 n=9 n=9 n=11 n=11 n=12 n=9 n=6
Figure 264 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WIFRD (S. Perth).
216 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
35 WIFRD (S.PERTH - WILSON MD) DOC
30
25 ) -1 20
15 DOC(mg L
10
5 2013-2017 data 2018 data
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=5 n=3 n=6 n=7 n=9 n=9 n=11 n=11 n=12 n=9 n=6
Figure 265 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WIFRD (S. Perth).
50 WIFRD (S.PERTH - WILSON MD) TSS
2013-2017 data 2018 data 40
) 30 -1
TSS(mg L 20
10
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=5 n=3 n=6 n=7 n=9 n=9 n=11 n=11 n=12 n=9 n=6
Figure 266 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WIFRD (S. Perth).
Department of Water and Environmental Regulation 217 Swan Canning Catchment Data Report January - December 2018
10 WIFRD (S.PERTH - WILSON MD) DO
8
) 6 -1
DO(mg L 4
2
2013-2017 data 2018 data 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=5 n=3 n=6 n=7 n=9 n=9 n=11 n=11 n=12 n=9 n=6
Figure 267 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WIFRD (S. Perth).
1.0 WIFRD (S.PERTH - WILSON MD) Sp. Conductivity
0.8 ) -1 0.6
0.4 Sp.Cond (mS cm
0.2
2013-2017 data 2018 data 0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=5 n=5 n=3 n=6 n=7 n=9 n=9 n=11 n=11 n=12 n=9 n=6
Figure 268 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WIFRD (S. Perth).
218 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 29 2018 monthly sample numbers, minimum and maximum values at WIFRD (S. Perth).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 3 2 0 0 0 2 2 3 2 2 2 1 min 1.30 1.60 - - - 0.83 0.82 0.88 1.20 1.10 1.30 1.20 max 2.00 1.80 - - - 1.60 1.70 1.80 1.40 1.20 1.30 1.20 med 1.40 1.70 - - - 1.22 1.26 1.60 1.30 1.15 1.30 1.20
-1 NH3-N (mg.L ) n 3 2 0 0 0 2 2 3 2 2 2 1 min 0.120 0.099 - - - 0.150 0.100 0.130 0.120 0.085 0.089 0.100 max 0.140 0.120 - - - 0.190 0.200 0.160 0.120 0.097 0.100 0.100 med 0.140 0.110 - - - 0.170 0.150 0.140 0.120 0.091 0.095 0.100
-1 NOx-N (mg.L ) n 3 2 0 0 0 2 2 3 2 2 2 1 min 0.110 0.120 - - - 0.240 0.150 0.340 0.180 0.100 0.110 0.087 max 0.610 0.180 - - - 0.470 0.490 0.550 0.300 0.160 0.110 0.087 med 0.160 0.150 - - - 0.355 0.320 0.370 0.240 0.130 0.110 0.087 DOrgN (mg.L-1) n 3 2 0 0 0 2 2 3 2 2 2 1 min 1.10 1.10 - - - 0.43 0.31 0.36 0.87 0.60 1.00 1.00 max 1.20 1.10 - - - 0.60 0.87 1.00 0.99 0.78 1.10 1.00 med 1.10 1.10 - - - 0.52 0.59 0.85 0.93 0.69 1.05 1.00 TP (mg.L-1) n 3 2 0 0 0 2 2 3 2 2 2 1 min 0.15 0.21 - - - 0.10 0.13 0.14 0.20 0.17 0.16 0.18 max 0.23 0.41 - - - 0.17 0.23 0.28 0.25 0.22 0.16 0.18 med 0.20 0.31 - - - 0.14 0.18 0.26 0.23 0.20 0.16 0.18 FRP (mg.L-1) n 3 2 0 0 0 2 2 3 2 2 2 1 min 0.110 0.110 - - - 0.073 0.077 0.110 0.180 0.150 0.120 0.150 max 0.170 0.120 - - - 0.130 0.190 0.240 0.210 0.170 0.130 0.150 med 0.150 0.115 - - - 0.102 0.134 0.230 0.195 0.160 0.125 0.150 DOC (mg.L-1) n 3 2 0 0 0 2 2 3 2 2 2 1 min 27 28 - - - 13 7 12 24 24 25 27 max 29 30 - - - 23 24 23 25 25 28 27 med 28 29 - - - 18 15.5 22 24.5 24.5 26.5 27 TSS (mg.L-1) n 3 2 0 0 0 2 2 3 2 2 2 1 min 3 35 - - - 3 0.5 0.5 1 2 3 3 max 8 39 - - - 5 19 4 2 5 3 3 med 5 37 - - - 4 9.75 0.5 1.5 3.5 3 3
Department of Water and Environmental Regulation 219 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 3 2 0 0 0 2 2 3 2 2 2 1 min 4.32 5.72 - - - 6.77 6.84 6.81 7.27 7.14 7.11 6.84 max 5.43 5.86 - - - 7.63 7.74 7.98 7.36 7.34 7.31 6.84 med 4.39 5.79 - - - 7.20 7.29 6.89 7.315 7.24 7.21 6.84 Sp. Conductivity (mS.cm-1) n 3 2 0 0 0 2 2 3 2 2 2 1 min 0.502 0.562 - - - 0.293 0.293 0.253 0.490 0.490 0.474 0.577 max 0.565 0.564 - - - 0.539 0.531 0.480 0.508 0.495 0.509 0.577 med 0.554 0.563 - - - 0.416 0.412 0.456 0.499 0.493 0.492 0.577
The Wilson main drain is ungauged at this site. The drain downstream of the culvert under Fern Road often ceases to flow during autumn; hence the lack of data points for the March to May 2018 period. The 2018 nitrogen data was often lower than the background data largely due to a combination of total oxidised nitrogen and dissolved organic nitrogen concentrations, both of which were lower than the background data through 2018, particularly from June onwards. The background data shows a seasonal response to winter run off with relatively elevated total oxidised nitrogen concentrations and greater variability and this is mirrored in the total nitrogen background data although it is less pronounced. Total phosphorus data was noticeably elevated during January and February and this coincided with elevated total suspended solids data; however past total suspended solids data has periodically exhibited high variability. Phosphorous concentrations in the catchment are largely driven by filterable reactive phosphorus concentrations and show a strong seasonal pattern, increasing during the wetter months of winter and early spring. Dissolved organic carbon and specific conductance data were also both clearly lower than the background data over winter 2018.
220 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
27 Southern River (SWS7)
2.5 SWS7 (SOUTHERN R.) TN
2.0
) 1.5 -1
TN (mgL 1.0
0.5
2013-2017 data 2018 data
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 269 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS7 (Southern R).
The 90th Percentile for May was 0.33 mg.L-1 0.20
SWS7 (SOUTHERN R.) NH3-N
2013-2017 data 2018 data
0.15 ) -1
0.10 -N(mg L 3 NH
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
+ -1 Figure 270 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS7 (Southern R).
Department of Water and Environmental Regulation 221 Swan Canning Catchment Data Report January - December 2018
1.2
SWS7 (SOUTHERN R.) NOx-N 2013-2017 data 2018 data 1.0
0.8 ) -1
0.6 NOx-N(mg L 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 271 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS7 (Southern R).
1.6 SWS7 (SOUTHERN R.) DOrgN 1.4
1.2
) 1.0 -1
0.8
DOrgN(mg L 0.6
0.4
0.2 2013-2017 data 2018 data 0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 272 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS7 (Southern R).
222 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
The 90th Percentile for Mar was 0.51 mg.L-1 0.30 SWS7 (SOUTHERN R.) TP
0.25
0.20 ) -1
0.15 TP(mg L
0.10
0.05 2013-2017 data 2018 data
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 273 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS7 (Southern R).
The 90th Percentile for Mar was 0.31 mg.L-1 0.20 SWS7 (SOUTHERN R.) FRP
0.15 ) -1
0.10 FRP(mg L
0.05
2013-2017 data 2018 data 0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 274 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS7 (Southern R).
Department of Water and Environmental Regulation 223 Swan Canning Catchment Data Report January - December 2018
50
SWS7 (SOUTHERN R.) DOC 2013-2017 data 2018 data
40
) 30 -1
DOC(mg L 20
10
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 275 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS7 (Southern R).
The 90th Percentile for Aug was 21 mg.L-1 18 SWS7 (SOUTHERN R.) TSS 2013-2017 data 16 2018 data
14
12 ) -1 10
8 TSS(mg L
6
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=12 n=12
Figure 276 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS7 (Southern R).
224 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
10 SWS7 (SOUTHERN R.) DO
8
) 6 -1
DO(mg L 4
2
2013-2017 data 2018 data
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=12
Figure 277 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS7 (Southern R).
1.6
SWS7 (SOUTHERN R.) Sp. Conductivity 2013-2017 data 1.4 2018 data
1.2 ) -1 1.0
0.8
0.6 Sp.Cond (mS cm
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=12 n=10 n=10 n=10 n=11 n=12 n=12 n=10 n=10 n=10 n=11 n=12
Figure 278 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS7 (Southern R).
Department of Water and Environmental Regulation 225 Swan Canning Catchment Data Report January - December 2018
Southern River (SWS7) 2018 flow 600
500
400
300
200 Daily discharge (ML) discharge Daily
100
0
Date
Figure 279 2018 Southern River (616092) flow – Daily discharge hydrograph measured in megalitres.
The 2018 hydrograph shows the seasonal pattern in the catchment’s response to wet season rainfall and base flows from groundwater interactions for the remainder of the year. It also demonstrates the response to the unseasonable rain event (16th January 2018) when Perth received 96.2 mm of rainfall in 24 hours.
226 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 30 2018 monthly sample numbers, minimum and maximum values at SWS7 (Southern R).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 1.20 1.20 1.10 1.10 0.82 0.82 1.70 1.80 1.60 1.10 1.00 1.00 max 1.40 1.30 1.20 1.10 0.98 1.30 1.70 2.00 2.30 1.20 1.10 1.20 med 1.30 1.25 1.15 1.10 0.94 1.06 1.70 1.90 1.95 1.10 1.05 1.10
-1 NH3-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.024 0.039 0.044 0.049 0.031 0.025 0.031 0.031 0.029 0.024 0.013 0.019 max 0.061 0.039 0.050 0.051 0.051 0.034 0.036 0.044 0.035 0.027 0.024 0.028 med 0.043 0.039 0.047 0.050 0.035 0.030 0.034 0.038 0.032 0.025 0.019 0.024
-1 NOx-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.190 0.200 0.160 0.140 0.110 0.250 0.630 0.810 0.530 0.220 0.170 0.130 max 0.200 0.210 0.210 0.160 0.190 0.490 0.870 0.930 0.540 0.350 0.210 0.150 med 0.195 0.205 0.185 0.150 0.150 0.370 0.750 0.870 0.535 0.260 0.190 0.140 DOrgN (mg.L-1) n 2 2 2 2 3 2 2 2 1 3 2 2 min 0.89 0.92 0.81 0.81 0.59 0.42 0.76 0.87 1.00 0.74 0.72 0.86 max 1.10 0.97 0.87 0.81 0.69 0.73 0.87 0.92 1.00 0.80 0.82 0.87 med 1.00 0.95 0.84 0.81 0.67 0.58 0.82 0.90 1.00 0.76 0.77 0.87 TP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.170 0.130 0.140 0.120 0.077 0.075 0.084 0.110 0.086 0.094 0.110 0.150 max 0.240 0.150 0.140 0.140 0.120 0.094 0.110 0.130 0.130 0.099 0.110 0.150 med 0.205 0.140 0.140 0.130 0.120 0.085 0.097 0.120 0.108 0.097 0.110 0.150 FRP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.110 0.089 0.094 0.078 0.041 0.033 0.055 0.081 0.076 0.061 0.069 0.086 max 0.170 0.090 0.110 0.098 0.072 0.034 0.067 0.081 0.082 0.070 0.076 0.100 med 0.140 0.090 0.102 0.088 0.072 0.034 0.061 0.081 0.079 0.066 0.073 0.093 DOC (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 25 25 25 27 15 9 19 21 23 19 21 27 max 27 29 26 30 23 13 20 22 24 23 24 28 med 26 27 25.5 28.5 21 11 19.5 21.5 23.5 22 22.5 27.5 TSS (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 6 4 3 7 3 8 3 5 3 1 3 4 max 7 7 4 7 4 8 6 8 6 4 4 7 med 6.5 5.5 3.5 7 3 8 4.5 6.5 4.5 2 3.5 5.5
Department of Water and Environmental Regulation 227 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 4.13 4.87 4.09 4.20 5.53 8.41 8.31 7.99 8.32 6.97 6.61 5.25 max 4.95 5.09 4.20 5.22 8.07 8.68 8.84 8.26 8.64 7.97 6.72 5.50 med 4.54 4.98 4.15 4.71 6.14 8.55 8.58 8.13 8.48 7.49 6.67 5.38 Sp. Conductivity (mS.cm-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.842 0.355 1.037 0.945 0.627 0.351 0.687 0.652 0.617 0.611 0.851 0.920 max 0.960 1.047 1.086 1.062 1.012 0.524 0.745 0.665 0.699 0.766 0.852 0.949 med 0.901 0.701 1.062 1.004 0.927 0.438 0.716 0.659 0.658 0.711 0.852 0.935
The 2018 data for the Southern River catchment site, SWS7, was similar to the background data or close enough to be considered natural variability, especially considering the past variability evident in the background data. Total oxidised nitrogen concentrations show a typical response the winter rain and run off, peaking over winter and early spring; and with greater variability in the background data over the same period. This is reflected in the total nitrogen data which although very variable (background data) shows a similar seasonal response to winter run off.
228 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
28 Neerigen Brook (AW05)
1.8
AW05 (NEERIGEN BK) TN 2013-2017 data 1.6 2018 data
1.4
1.2 ) -1 1.0
0.8 TN(mg L
0.6
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=1 n=0 n=8 n=10 n=9 n=12 n=11 n=12 n=8 n=6
Figure 280 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site AW05 (Neerigen Bk).
0.4 AW05 (NEERIGEN BK) NH -N 3 2013-2017 data 2018 data
0.3 ) -1
0.2 -N(mg L 3 NH
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=1 n=0 n=8 n=10 n=9 n=12 n=11 n=12 n=8 n=6
+ -1 Figure 281 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site AW05 (Neerigen Bk).
Department of Water and Environmental Regulation 229 Swan Canning Catchment Data Report January - December 2018
1.2 AW05 (NEERIGEN BK) NOx-N 2013-2017 data 2018 data 1.0
0.8 ) -1
0.6 NOx-N(mg L 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=1 n=0 n=8 n=10 n=9 n=12 n=11 n=12 n=8 n=6
Figure 282 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at AW05 (Neerigen Bk).
0.6
AW05 (NEERIGEN BK) DOrgN 2013-2017 data 2018 data 0.5
0.4 ) -1
0.3 DOrgN(mg L 0.2
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=1 n=0 n=8 n=10 n=9 n=12 n=11 n=12 n=8 n=6
Figure 283 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at AW05 (Neerigen Bk).
230 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
0.14 AW05 (NEERIGEN BK) TP 2013-2017 data 2018 data 0.12
0.10 )
-1 0.08
0.06 TP(mg L
0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=1 n=0 n=8 n=10 n=9 n=12 n=11 n=12 n=8 n=6
Figure 284 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site AW05 (Neerigen Bk).
0.06 AW05 (NEERIGEN BK) FRP 2013-2017 data 2018 data 0.05
0.04 ) -1
0.03 FRP(mg L
0.02
0.01
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=1 n=0 n=8 n=10 n=9 n=12 n=11 n=12 n=8 n=6
Figure 285 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at AW05 (Neerigen Bk).
Department of Water and Environmental Regulation 231 Swan Canning Catchment Data Report January - December 2018
14 AW05 (NEERIGEN BK) DOC 2013-2017 data 2018 data 12
10 ) -1 8
6 DOC(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=1 n=0 n=8 n=10 n=9 n=12 n=11 n=12 n=8 n=6
Figure 286 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at AW05 (Neerigen Bk).
The 90th Percentile for Oct was 61 mg.L-1 40 AW05 (NEERIGEN BK) TSS
2013-2017 data 2018 data 30 ) -1
20 TSS(mg L
10
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=1 n=0 n=8 n=10 n=9 n=12 n=11 n=12 n=8 n=6
Figure 287 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site AW05 (Neerigen Bk).
232 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
12 AW05 (NEERIGEN BK) DO
10
8 ) -1
6 DO(mg L
4
2 2013-2017 data 2018 data 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=1 n=0 n=8 n=10 n=9 n=12 n=11 n=12 n=8 n=6
Figure 288 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site AW05 (Neerigen Bk).
0.6 AW05 (NEERIGEN BK) Sp. Conductivity
0.5
) 0.4 -1
0.3
Sp.Cond (mS cm 0.2
0.1 2013-2017 data 2018 data
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=1 n=0 n=8 n=10 n=9 n=12 n=11 n=12 n=8 n=6
Figure 289 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site AW05 (Neerigen Bk).
Department of Water and Environmental Regulation 233 Swan Canning Catchment Data Report January - December 2018
Table 31 2018 monthly sample numbers, minimum and maximum values at AW05 (Neerigen Bk).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) N 1 0 0 0 0 2 2 3 2 2 2 1 min 1.40 - - - - 0.86 0.53 0.55 0.23 0.18 0.16 0.21 max 1.40 - - - - 0.94 0.90 0.95 0.43 0.53 0.18 0.21 med 1.40 - - - - 0.90 0.72 0.73 0.33 0.36 0.17 0.21
-1 NH3-N (mg.L ) N 1 0 0 0 0 2 2 3 2 2 2 1 min 0.044 - - - - 0.230 0.019 0.020 0.014 <0.01 <0.01 0.013 max 0.044 - - - - 0.430 0.095 0.039 0.018 0.017 0.011 0.013 med 0.044 - - - - 0.330 0.057 0.021 0.016 0.011 0.008 0.013
-1 NOx-N (mg.L ) N 1 0 0 0 0 2 2 3 2 2 2 1 min 0.70 - - - - 0.210 0.480 0.390 0.150 0.053 <0.01 <0.01 max 0.70 - - - - 0.340 0.640 0.710 0.250 0.200 <0.01 <0.01 med 0.70 - - - - 0.275 0.560 0.450 0.200 0.127 <0.01 <0.01 DOrgN (mg.L-1) N 1 0 0 0 0 2 2 3 2 2 2 1 min 0.350 - - - - 0.080 0.028 <0.025 0.066 0.120 0.150 0.180 max 0.350 - - - - 0.220 0.071 0.130 0.150 0.140 0.150 0.180 med 0.350 - - - - 0.150 0.050 0.013 0.108 0.130 0.150 0.180 TP (mg.L-1) N 1 0 0 0 0 2 2 3 2 2 2 1 min 0.052 - - - - 0.052 0.010 0.022 <0.005 0.011 0.008 0.017 max 0.052 - - - - 0.056 0.027 0.033 0.010 0.035 0.012 0.017 med 0.052 - - - - 0.054 0.019 0.025 0.006 0.023 0.010 0.017 FRP (mg.L-1) N 1 0 0 0 0 2 2 3 2 2 2 1 min 0.016 - - - - 0.020 0.009 0.007 <0.005 <0.005 0.005 0.010 max 0.016 - - - - 0.030 0.014 0.012 <0.005 0.010 0.005 0.010 med 0.016 - - - - 0.025 0.012 0.010 <0.005 0.006 0.005 0.010 DOC (mg.L-1) N 1 0 0 0 0 2 2 3 2 2 2 1 min 8 - - - - 4 3 3 2 2 3 4 max 8 - - - - 4 4 4 2 4 3 4 med 8 - - - - 4 3.5 4 2 3 3 4 TSS (mg.L-1) N 1 0 0 0 0 2 2 3 2 2 2 1 min 10 - - - - 4 2 6 1 2 0.5 0.5 max 10 - - - - 9 11 30 2 14 2 0.5 med 10 - - - - 6.5 6.5 6 1.5 8 1.25 0.5
234 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) N 1 0 0 0 0 2 2 3 2 2 2 1 min 7.36 - - - - 10.21 10.42 10.48 10.17 9.66 10.28 10.01 max 7.36 - - - - 10.53 11.16 10.78 10.54 10.52 10.57 10.01 med 7.36 - - - - 10.37 10.79 10.71 10.36 10.09 10.43 10.01 Sp. Conductivity (mS.cm-1) N 1 0 0 0 0 2 2 3 2 2 2 1 min 0.290 - - - - 0.241 0.272 0.234 0.305 0.243 0.312 0.344 max 0.290 - - - - 0.248 0.315 0.321 0.312 0.306 0.339 0.344 med 0.290 - - - - 0.245 0.294 0.256 0.309 0.275 0.326 0.344
There is no hydrograph for this site as it is ungauged. Neerigen brook is an ephemeral system flowing in response to winter rain and run off and tending to cease flowing by early summer. The 2018 data for Neerigen Brook was generally similar to the background data, which itself is very variable, or close enough to be attributed to natural variation in water quality. The only really notable divergence from the background data was an elevated ammoniacal nitrogen concentration in June, at the resumption of flow in the catchment. Dissolved organic nitrogen tended to be slightly lower than the background data throughout 2018 (when data was collected); although again variability in the background data was high.
Department of Water and Environmental Regulation 235 Swan Canning Catchment Data Report January - December 2018
29 Susannah Brook (SWN11)
2.0 SWN11 (SUSANNAH BK) TN 1.8 2013-2017 data 1.6 2018 data
1.4
) 1.2 -1
1.0
TN(mg L 0.8
0.6
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=3 n=7 n=10 n=10 n=9 n=4 n=0
Figure 290 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN11 (Susannah Bk).
0.16
SWN11 (SUSANNAH BK) NH3-N
0.14 2013-2017 data 2018 data 0.12
) 0.10 -1
0.08 -N(mg L 3
NH 0.06
0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=3 n=7 n=10 n=10 n=9 n=4 n=0
+ -1 Figure 291 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN11 (Susannah Bk).
236 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
1.6 SWN11 (SUSANNAH BK) NOx-N
1.4 2013-2017 data 2018 data 1.2
) 1.0 -1
0.8
NOx-N(mg L 0.6
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=3 n=7 n=10 n=10 n=9 n=4 n=0
Figure 292 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN11 (Susannah Bk).
0.7 SWN11 (SUSANNAH BK) DOrgN
0.6 2013-2017 data 2018 data
0.5 ) -1 0.4
0.3 DOrgN(mg L
0.2
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=3 n=7 n=10 n=10 n=9 n=4 n=0
Figure 293 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN11 (Susannah Bk).
Department of Water and Environmental Regulation 237 Swan Canning Catchment Data Report January - December 2018
The 90th Percentile for Aug was 0.07 mg.L-1 0.06 SWN11 (SUSANNAH BK) TP
2013-2017 data 0.05 2018 data
0.04 ) -1
0.03 TP(mg L
0.02
0.01
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=3 n=7 n=10 n=10 n=9 n=4 n=0
Figure 294 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN11 (Susannah Bk).
The 90th Percentile for Aug was 0.03 mg.L-1 0.020 SWN11 (SUSANNAH BK) FRP 2013-2017 data 2018 data
0.015 ) -1
0.010 FRP(mg L
0.005
0.000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=3 n=7 n=10 n=10 n=9 n=4 n=0
Figure 295 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN11 (Susannah Bk).
238 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
16 SWN11 (SUSANNAH BK) DOC
14 2013-2017 data 2018 data 12
10 ) -1
8 DOC(mg L 6
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=3 n=7 n=10 n=10 n=9 n=4 n=0
Figure 296 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWN11 (Susannah Bk).
The 90th Percentile for Aug was 24 mg.L-1 8
SWN11 (SUSANNAH BK) TSS 2013-2017 data 2018 data
6 ) -1
4 TSS(mg L
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=3 n=7 n=10 n=10 n=9 n=4 n=0
Figure 297 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN11 (Susannah Bk).
Department of Water and Environmental Regulation 239 Swan Canning Catchment Data Report January - December 2018
12
SWN11 (SUSANNAH BK) DO 2013-2017 data 2018 data 10
8 ) -1
6 DO(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=3 n=7 n=10 n=10 n=9 n=4 n=0
Figure 298 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN11 (Susannah Bk).
1.4 SWN11 (SUSANNAH BK) Sp. Conductivity 2013-2017 data 2018 data 1.2
1.0 ) -1
0.8
0.6 Sp.Cond (mS cm
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=3 n=7 n=10 n=10 n=9 n=4 n=0
Figure 299 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWN11 (Susannah Bk).
240 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Susannah Bk (SWN11) 2018 flow 400 350 300
250
200 150
100 Daily discharge (ML) Daily discharge 50
0
Date
Figure 300 2018 Susannah Bk flow (616099) – Daily discharge hydrograph measured in megalitres.
Department of Water and Environmental Regulation 241 Swan Canning Catchment Data Report January - December 2018
Table 32 2018 monthly sample numbers, minimum and maximum values at SWN11 (Susannah Bk).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 0 0 0 0 0 1 2 2 2 3 0 0 min - - - - - 0.71 1.40 0.82 0.66 0.36 - - max - - - - - 0.71 1.40 1.40 1.40 0.87 - - med - - - - - 0.71 1.40 1.11 1.03 0.55 - -
-1 NH3-N (mg.L ) n 0 0 0 0 0 1 2 2 2 3 0 0 min - - - - - 0.014 0.019 0.019 0.021 0.023 - - max - - - - - 0.014 0.021 0.020 0.030 0.038 - - med - - - - - 0.014 0.020 0.020 0.026 0.026 - -
-1 NOx-N (mg.L ) n 0 0 0 0 0 1 2 2 2 3 0 0 min - - - - - 0.30 0.93 0.45 0.30 0.18 - - max - - - - - 0.30 1.20 1.00 0.37 0.50 - - med - - - - - 0.30 1.07 0.73 0.34 0.24 - - DOrgN (mg.L-1) n 0 0 0 0 0 1 2 2 1 3 0 0 min - - - - - 0.39 0.25 0.35 0.27 0.11 - - max - - - - - 0.39 0.42 0.38 0.27 0.33 - - med - - - - - 0.39 0.34 0.37 0.27 0.25 - - TP (mg.L-1) n 0 0 0 0 0 1 2 2 2 3 0 0 min - - - - - 0.017 <0.005 0.016 0.006 0.013 - - max - - - - - 0.017 0.015 0.022 0.018 0.018 - - med - - - - - 0.017 0.009 0.019 0.012 0.015 - - FRP (mg.L-1) n 0 0 0 0 0 1 2 2 2 3 0 0 min - - - - - <0.005 <0.005 0.011 0.005 <0.005 - - max - - - - - <0.005 0.005 0.013 0.006 0.006 - - med - - - - - <0.005 0.004 0.012 0.006 0.006 - - DOC (mg.L-1) n 0 0 0 0 0 1 2 2 2 3 0 0 min - - - - - 9 6 7 5 6 - - max - - - - - 9 8 7 5 8 - - med - - - - - 9 7 7 5 7 - - TSS (mg.L-1) n 0 0 0 0 0 1 2 2 2 3 0 0 min - - - - - <1 <1 3 2 <1 - - max - - - - - <1 2 5 4 2 - - med - - - - - <1 1.25 4 3 2 - -
242 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 0 0 0 0 0 1 2 2 2 3 0 0 min - - - - - 5.26 7.69 8.26 8.80 5.00 - - max - - - - - 5.26 8.10 8.70 8.98 7.36 - - med - - - - - 5.26 7.90 8.48 8.89 7.08 - - Sp. Conductivity (mS.cm-1) n 0 0 0 0 0 1 2 2 2 3 0 0 min - - - - - 0.805 0.549 0.420 0.456 0.640 - - max - - - - - 0.805 0.728 0.428 0.525 0.802 - - med - - - - - 0.805 0.638 0.424 0.491 0.657 - -
The data for Susannah Brook is limited, as the catchment is ephemeral and usually only flows for a relatively short period each winter and spring in response to winter rain and run off. This was again the case in 2018 with just ten samples collected between mid-June and the end of October. The 2018 Susannah Brook data generally followed the background data with the notable exception of elevated concentrations of total nitrogen over winter and this was driven by similarly elevated total oxidised nitrogen concentrations, particularly during July and August.
Department of Water and Environmental Regulation 243 Swan Canning Catchment Data Report January - December 2018
30 Upper Swan (CSMDREID)
3.0 CSMDREID (UPPER SWAN) TN
2.5
2.0 ) -1
1.5 T N ( m g L
1.0
0.5 2013-2017 data 2018 data
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 301 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CSMDREID (Upper Swan).
The 90th Percentile for Apr was 0.21 mg.L-1 0.16
CSMDREID (UPPER SWAN) NH3-N 2013-2017 data 0.14 2018 data
0.12
) 0.10 -1
0.08 -N (mg L 3
NH 0.06
0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
+ -1 Figure 302 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CSMDREID (Upper Swan).
244 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
1.8 CSMDREID (UPPER SWAN) NOx-N 2013-2017 data 1.6 2018 data
1.4
1.2 ) -1 1.0
0.8 N O x - N ( m g L 0.6
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 303 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CSMDREID (Upper Swan).
1.2 CSMDREID (UPPER SWAN) DOrgN 2013-2017 data 2018 data 1.0
0.8 ) -1
0.6 D O r g N ( m g L 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 304 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CSMDREID (Upper Swan).
Department of Water and Environmental Regulation 245 Swan Canning Catchment Data Report January - December 2018
The 90th Percentile for The 90th Percentile for Mar was 1.43 mg.L-1 Jul was 1.71 mg.L-1 0.9 CSMDREID (UPPER SWAN) TP 2013-2017 data 0.8 2018 data
0.7
0.6 ) -1 0.5
0.4 T P ( m g L
0.3
0.2
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 305 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CSMDREID (Upper Swan).
The 90th Percentile for The 90th Percentile for Mar was 1.14 mg.L-1 Mar was 0.62 mg.L-1 0.4 CSMDREID (UPPER SWAN) FRP
2013-2017 data 2018 data 0.3 ) -1
0.2 F R P ( m g L
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 306 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CSMDREID (Upper Swan).
246 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
30
CSMDREID (UPPER SWAN) DOC 2013-2017 data 2018 data 25
20 ) -1
15 D O C ( m g L
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 307 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at CSMDREID (Upper Swan).
The 90th Percentile for The 90th Percentile for Jul was 95 mg.L-1 Sep was 101 mg.L-1 80 CSMDREID (UPPER SWAN) TSS
2013-2017 data 2018 data 60 ) -1
40 T S S ( m g L
20
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=10 n=10 n=10 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 308 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CSMDREID (Upper Swan).
Department of Water and Environmental Regulation 247 Swan Canning Catchment Data Report January - December 2018
14 CSMDREID (UPPER SWAN) DO
12
10 )
-1 8
6 D O ( m g L
4
2 2013-2017 data 2018 data
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=10 n=10 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 309 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CSMDREID (Upper Swan).
1.2 CSMDREID (UPPER SWAN) Sp. Conductivity
1.0
) 0.8 -1
0.6
S p . C o n d (0.4 m S c m
0.2 2013-2017 data 2018 data
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=10 n=10 n=12 n=11 n=10 n=10 n=12 n=11 n=12 n=10 n=10
Figure 310 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site CSMDREID (Upper Swan).
248 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 33 2018 monthly sample numbers, minimum and maximum values at CSMDREID (Upper Swan).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 1.10 0.84 0.88 1.50 1.60 0.34 0.65 1.10 1.40 1.20 1.10 0.92 max 1.40 0.97 1.10 1.60 1.70 1.10 1.60 1.90 1.60 1.40 1.20 0.99 med 1.30 0.91 0.99 1.55 1.65 0.72 1.13 1.40 1.50 1.30 1.15 0.96
-1 NH3-N (mg.L ) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.033 0.038 0.029 0.042 0.038 0.025 0.036 0.048 0.026 0.027 0.026 0.037 max 0.067 0.043 0.059 0.059 0.054 0.036 0.059 0.075 0.044 0.063 0.048 0.042 med 0.041 0.041 0.044 0.051 0.046 0.031 0.048 0.049 0.035 0.045 0.037 0.040
-1 NOx-N (mg.L ) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.37 0.25 0.49 0.67 0.69 0.10 0.31 0.58 0.71 0.64 0.39 0.19 max 0.57 0.40 0.56 0.74 0.92 0.60 0.86 1.00 0.77 0.65 0.48 0.25 med 0.39 0.33 0.53 0.71 0.81 0.35 0.59 0.77 0.74 0.65 0.44 0.22 DOrgN (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.57 0.24 0.28 0.42 0.30 0.19 0.27 0.13 0.51 0.38 0.61 0.64 max 0.63 0.53 0.45 0.58 0.48 0.25 0.70 0.74 0.83 0.57 0.64 0.64 med 0.62 0.39 0.37 0.50 0.39 0.22 0.49 0.68 0.67 0.48 0.63 0.64 TP (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.160 0.082 0.045 0.220 0.310 0.074 0.130 0.110 0.140 0.140 0.150 0.130 max 0.240 0.160 0.120 0.230 0.380 0.098 0.140 0.160 0.140 0.150 0.170 0.180 med 0.230 0.121 0.083 0.225 0.345 0.086 0.135 0.150 0.140 0.145 0.160 0.155 FRP (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.060 0.037 0.033 0.048 0.046 0.033 0.086 0.072 0.096 0.100 0.098 0.083 max 0.110 0.077 0.046 0.049 0.047 0.035 0.089 0.100 0.100 0.120 0.120 0.110 med 0.093 0.057 0.040 0.049 0.047 0.034 0.088 0.100 0.098 0.110 0.109 0.097 DOC (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 13 8 8 12 11 4 8 11 17 17 14 15 max 16 14 10 14 11 9 16 18 18 19 16 16 med 15 11 9 13 11 6.5 12 16 17.5 18 15 15.5 TSS (mg.L-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 5 4 4 38 59 6 1 1 3 4 3 1 max 35 11 13 40 69 8 12 3 5 4 7 4 med 15 7.5 8.5 39 64 7 6.5 3 4 4 5 2.5
Department of Water and Environmental Regulation 249 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 2 2 2 2 2 2 2 3 2 2 2 2 min 5.25 8.38 8.60 8.10 7.83 7.53 8.84 9.14 11.15 10.29 11.42 10.70 max 6.44 9.10 8.92 8.63 7.90 9.26 9.33 10.83 11.74 10.37 11.48 12.28 med 5.85 8.74 8.76 8.37 7.87 8.40 9.09 9.34 11.45 10.33 11.45 11.49 Sp. Conductivity (mS.cm-1) n 3 2 2 2 2 2 2 3 2 2 2 2 min 0.766 0.807 0.808 0.817 0.865 0.161 0.354 0.508 0.701 0.752 0.786 0.802 max 0.802 0.812 0.818 0.839 0.876 0.644 0.768 0.681 0.761 0.760 0.787 0.909 med 0.781 0.810 0.813 0.828 0.871 0.403 0.561 0.580 0.731 0.756 0.787 0.856
The 2018 data for Chapman Street main drain was varied for nitrogen but the background data is also highly variable. Total nitrogen often was outside the range of background data but followed a similar patter to the total oxidised nitrogen data, which while varied didn’t fall outside the background data as often as the total nitrogen data nor to the same extent. Dissolved organic nitrogen data was below the range of the background data on a few occasions in autumn, winter and spring which is unusual but there is no clear explanation as to why this may have happened, although background variability is high. Phosphorus followed the background data except for a peak in total phosphorus concentration in May which coincided with a peak in total suspended solids. Both samples in May 2018 recorded elevated concentrations of total phosphorus and total suspended solids. Both phosphorus (total and soluble) and total suspended solids have shown a high degree of variability in the background data at various times of the year so it is possible this is another example of variability in the catchment, possibly based on land use activities upstream.
250 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
31 Upper Swan (WNDCK)
4 WNDCK (WANDOO CK) TN
2013-2017 data 2018 data 3 ) -1
2 T N ( m g L
1
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=0 n=2 n=3 n=4 n=2 n=0 n=0
Figure 311 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WNDCK (Upper Swan).
0.25
WNDCK (WANDOO CK) NH3-N 2013-2017 data 2018 data
0.20 )
-1 0.15 -N (mg L 3 0.10 NH
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=0 n=2 n=3 n=4 n=2 n=0 n=0
+ -1 Figure 312 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WNDCK (Upper Swan).
Department of Water and Environmental Regulation 251 Swan Canning Catchment Data Report January - December 2018
0.18 WNDCK (WANDOO CK) NOx-N 0.16 2013-2017 data 2018 data 0.14
0.12 ) -1 0.10
0.08 N O x - N ( m g L 0.06
0.04
0.02
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=0 n=2 n=3 n=4 n=2 n=0 n=0
Figure 313 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WNDCK (Upper Swan).
3.5 WNDCK (WANDOO CK) DOrgN
3.0 2013-2017 data 2018 data
2.5 ) -1 2.0
1.5 D O r g N ( m g L
1.0
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=0 n=2 n=3 n=4 n=2 n=0 n=0
Figure 314 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WNDCK (Upper Swan).
252 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
0.7 WNDCK (WANDOO CK) TP
0.6 2013-2017 data 2018 data
0.5 )
-1 0.4
0.3 T P ( m g L
0.2
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=0 n=2 n=3 n=4 n=2 n=0 n=0
Figure 315 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WNDCK (Upper Swan).
0.4 WNDCK (WANDOO CK) FRP
2013-2017 data 2018 data 0.3 ) -1
0.2 F R P ( m g L
0.1
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=0 n=2 n=3 n=4 n=2 n=0 n=0
Figure 316 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WNDCK (Upper Swan).
Department of Water and Environmental Regulation 253 Swan Canning Catchment Data Report January - December 2018
60 WNDCK (WANDOO CK) DOC
50 2013-2017 data 2018 data
40 ) -1
30 D O C ( m g L
20
10
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=0 n=2 n=3 n=4 n=2 n=0 n=0
Figure 317 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at WNDCK (Upper Swan).
50 WNDCK (WANDOO CK) TSS
2013-2017 data 40 2018 data
) 30 -1
T S S ( m g L 20
10
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=0 n=2 n=3 n=4 n=2 n=0 n=0
Figure 318 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WNDCK (Upper Swan).
254 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
8 WNDCK (WANDOO CK) DO
2013-2017 data 2018 data 6 ) -1
4 D O ( m g L
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=0 n=2 n=3 n=4 n=2 n=0 n=0
Figure 319 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WNDCK (Upper Swan).
1.2 WNDCK (WANDOO CK) Sp. Conductivity
1.0 2013-2017 data 2018 data
) 0.8 -1
0.6
S p . C o n d (0.4 m S c m
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=0 n=0 n=0 n=0 n=0 n=0 n=2 n=3 n=4 n=2 n=0 n=0
Figure 320 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site WNDCK (Upper Swan).
Department of Water and Environmental Regulation 255 Swan Canning Catchment Data Report January - December 2018
Table 34 2018 monthly sample numbers, minimum and maximum values at WNDCK (Upper Swan).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 0 0 0 0 0 0 0 0 0 0 0 0 min ------max ------med ------
-1 NH3-N (mg.L ) n 0 0 0 0 0 0 0 0 0 0 0 0 min ------max ------med ------
-1 NOx-N (mg.L ) n 0 0 0 0 0 0 0 0 0 0 0 0 min ------max ------med ------DOrgN (mg.L-1) n 0 0 0 0 0 0 0 0 0 0 0 0 min ------max ------med ------TP (mg.L-1) n 0 0 0 0 0 0 0 0 0 0 0 0 min ------max ------med ------FRP (mg.L-1) n 0 0 0 0 0 0 0 0 0 0 0 0 min ------max ------med ------DOC (mg.L-1) n 0 0 0 0 0 0 0 0 0 0 0 0 min ------max ------med ------TSS (mg.L-1) n 0 0 0 0 0 0 0 0 0 0 0 0 min ------max ------med ------
256 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 0 0 0 0 0 0 0 0 0 0 0 0 min ------max ------med ------Sp. Conductivity (mS.cm-1) n 0 0 0 0 0 0 0 0 0 0 0 0 min ------max ------med ------
No data was collected for this site for the whole of 2018 and there is limited background data for comparison. Generally the total nitrogen concentrations have been elevated (largely due to dissolved organic nitrogen) and the total phosphorus and filterable reactive phosphorus are also relatively elevated, as is typical for semi-rural catchments (e.g. Ellen Brook). But given the minimal flow and patchiness of the data, not to mention access issues with the landholder, the suitability of the site location within the catchment needs to be carefully considered.
Department of Water and Environmental Regulation 257 Swan Canning Catchment Data Report January - December 2018
32 Yule Brook (SWS3) The 90th Percentile for The 90th Percentile for Feb was 4.60 mg.L-1 Nov was 19.99 mg.L-1 2.5 SWS3 (YULE BK) TN 2013-2017 data 2018 data
2.0
) 1.5 -1
TN (mgL 1.0
0.5
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=7 n=7 n=10 n=11 n=12 n=12 n=10 n=10 n=9 n=12 n=11
Figure 321 2018 Total Nitrogen (TN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS3 (Yule Bk).
The 90th Percentile for The 90th Percentile for Feb was 3.50 mg.L-1 Nov was 10.67 mg.L-1 1.0
SWS3 (YULE BK) NH3-N 2013-2017 data 2018 data
0.8 )
-1 0.6 -N(mg L 3 0.4 NH
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=7 n=7 n=10 n=11 n=12 n=12 n=10 n=10 n=9 n=12 n=11
+ -1 Figure 322 2018 Ammoniacal Nitrogen (NH3/NH4 -N) (mg.L ) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS3 (Yule Bk).
258 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
1.4
SWS3 (YULE BK) NOx-N 2013-2017 data 2018 data 1.2
1.0 ) -1 0.8
0.6 NOx-N(mg L
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=7 n=7 n=10 n=11 n=12 n=12 n=10 n=10 n=9 n=12 n=11
Figure 323 2018 Total Oxidised Nitrogen (NOx-N) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS3 (Yule Bk).
The 90th Percentile for Nov was 9.29 mg.L-1 1.4 SWS3 (YULE BK) DOrgN
1.2
1.0 ) -1 0.8
0.6 DOrgN(mg L
0.4
0.2 2013-2017 data 2018 data 0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=7 n=7 n=10 n=11 n=12 n=12 n=10 n=10 n=9 n=12 n=11
Figure 324 2018 Dissolved Organic Nitrogen (DOrgN) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS3 (Yule Bk).
Department of Water and Environmental Regulation 259 Swan Canning Catchment Data Report January - December 2018
1.0 SWS3 (YULE BK) TP
2013-2017 data 0.8 2018 data
) 0.6 -1
TP(mg L 0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=7 n=7 n=10 n=11 n=12 n=12 n=10 n=10 n=9 n=12 n=11
Figure 325 2018 Total Phosphorus (TP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS3 (Yule Bk).
The 90th Percentile for Feb was 0.38 mg.L-1 0.30 SWS3 (YULE BK) FRP
2013-2017 data 0.25 2018 data
0.20 ) -1
0.15 FRP(mg L
0.10
0.05
0.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=7 n=7 n=10 n=11 n=12 n=12 n=10 n=10 n=9 n=12 n=11
Figure 326 2018 Filterable Reactive Phosphorus (FRP) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS3 (Yule Bk).
260 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
30 SWS3 (YULE BK) DOC
2013-2017 data 25 2018 data
20 ) -1
15 DOC(mg L
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=7 n=7 n=10 n=11 n=12 n=12 n=10 n=10 n=9 n=12 n=11
Figure 327 2018 Dissolved Organic Carbon (DOC) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at SWS3 (Yule Bk).
35 SWS3 (YULE BK) TSS 2013-2017 data 2018 data 30
25 ) -1 20
15 TSS(mg L
10
5
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=7 n=7 n=9 n=11 n=12 n=12 n=10 n=10 n=9 n=12 n=11
Figure 328 2018 Total Suspended Solids (TSS) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS3 (Yule Bk).
Department of Water and Environmental Regulation 261 Swan Canning Catchment Data Report January - December 2018
12 SWS3 (YULE BK) DO 2013-2017 data 2018 data 10
8 ) -1
6 DO(mg L
4
2
0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=7 n=7 n=10 n=11 n=12 n=12 n=10 n=10 n=9 n=12 n=11
Figure 329 2018 Dissolved Oxygen (DO) (mg.L-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS3 (Yule Bk).
1.6 SWS3 (YULE BK) Sp. Conductivity 2013-2017 data 1.4 2018 data
1.2 ) -1 1.0
0.8
0.6 Sp.Cond (mS cm
0.4
0.2
0.0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec n=9 n=7 n=7 n=10 n=11 n=12 n=12 n=10 n=10 n=9 n=12 n=11
Figure 330 2018 Specific Conductivity (mS.cm-1) monthly medians over 2013-2017 monthly box plots of median, 25th, 75th, 10th and 90th percentiles, at site SWS3 (Yule Bk).
262 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
Table 35 2018 monthly sample numbers, minimum and maximum values at SWS3 (Yule Bk).
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TN (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.81 0.78 0.79 0.78 0.86 0.86 1.00 1.20 1.10 0.59 0.61 0.71 max 1.10 0.83 0.88 0.83 0.97 0.86 1.60 1.80 1.80 0.89 0.67 0.76 med 0.96 0.81 0.84 0.81 0.87 0.86 1.30 1.50 1.45 0.72 0.64 0.74
-1 NH3-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.049 0.044 0.031 0.040 0.064 <0.01 0.010 0.022 0.017 0.028 0.098 0.057 max 0.180 0.072 0.032 0.070 0.140 0.026 0.080 0.031 0.032 0.057 0.170 0.066 med 0.115 0.058 0.032 0.055 0.130 0.016 0.045 0.027 0.025 0.056 0.134 0.062
-1 NOx-N (mg.L ) n 2 2 2 2 3 2 2 2 2 3 2 2 min <0.01 <0.01 <0.01 0.025 0.087 0.200 0.540 0.710 0.400 0.150 0.027 0.016 max 0.061 0.035 0.016 0.032 0.130 0.220 0.920 1.200 0.540 0.430 0.048 0.022 med 0.033 0.020 0.011 0.029 0.091 0.210 0.730 0.955 0.470 0.250 0.038 0.019 DOrgN (mg.L-1) n 2 2 2 2 3 2 2 2 1 3 2 2 min 0.66 0.56 0.61 0.63 0.40 0.31 0.31 0.40 0.43 0.27 0.32 0.51 max 0.69 0.57 0.65 0.70 0.59 0.42 0.39 0.44 0.43 0.31 0.46 0.53 med 0.68 0.57 0.63 0.67 0.50 0.37 0.35 0.42 0.43 0.30 0.39 0.52 TP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.200 0.140 0.160 0.140 0.110 0.086 0.053 0.049 0.021 0.059 0.100 0.190 max 0.280 0.150 0.170 0.230 0.270 0.140 0.063 0.051 0.054 0.076 0.130 0.230 med 0.240 0.145 0.165 0.185 0.190 0.113 0.058 0.050 0.038 0.067 0.115 0.210 FRP (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.092 0.066 0.074 0.087 0.065 0.020 0.014 0.017 0.017 0.024 0.059 0.098 max 0.150 0.077 0.088 0.160 0.170 0.033 0.034 0.026 0.023 0.043 0.074 0.130 med 0.121 0.072 0.081 0.124 0.100 0.027 0.024 0.022 0.020 0.037 0.067 0.114 DOC (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 13 13 13 15 9 6 6 7 7 6 7 12 max 14 13 14 17 13 7 7 8 8 7 10 13 med 13.5 13 13.5 16 12 6.5 6.5 7.5 7.5 7 8.5 12.5 TSS (mg.L-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 6 4 6 2 6 10 5 6 3 4 3 5 max 12 12 7 4 10 22 7 6 8 7 4 6 med 9 8 6.5 3 9 16 6 6 5.5 4 3.5 5.5
Department of Water and Environmental Regulation 263 Swan Canning Catchment Data Report January - December 2018
DO (mg.L-1) n 2 1 2 2 3 2 2 2 2 3 2 2 min 1.58 1.47 1.53 1.03 1.67 5.67 5.45 8.14 8.18 4.43 2.47 2.63 max 2.15 1.47 2.27 1.37 5.35 6.54 8.12 8.47 8.59 6.94 3.96 3.77 med 1.87 1.47 1.90 1.20 2.09 6.11 6.79 8.31 8.39 5.69 3.22 3.20 Sp. Conductivity (mS.cm-1) n 2 2 2 2 3 2 2 2 2 3 2 2 min 0.668 0.806 0.928 1.010 0.518 0.372 0.556 0.546 0.491 0.588 0.832 1.028 max 0.932 0.887 0.935 1.020 0.863 0.379 0.636 0.621 0.683 0.736 0.930 1.054 med 0.800 0.847 0.932 1.015 0.831 0.376 0.596 0.584 0.587 0.677 0.881 1.041
Please note there is no hydrograph for Yule Bk as majority of year’s data, (from April onwards) that was provided by Water Corporation, is missing. The 2018 data for Yule Brook was generally within the range of the background data, which itself was highly varied. There was a strong seasonal response in the total oxidised nitrogen concentrations during 2018 to winter rain and run off, which was also evident in the background data; and this is mirrored in the total nitrogen data from July to September 2018.
264 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
33 SWANCATCH/SCWQIP data comparison Table 36 2018 (January - December) mean ± standard deviation for all SWANCATCH (bold font) and SCWQIP (regular font) sites.
Specific Catchment Site TN NH -N NO -N DOrgN TP FRP DOC TSS DO 3 x Conductivity
Avon (Millendon) SWN5 1.20 ± 0.50 0.04 ± 0.06 0.21 ± 0.31 0.85 ± 0.25 0.02 ± 0.01 0.01 ± 0.01 16.85 ± 3.72 6.60 ± 7.53 7.84 ± 2.02 10.35 ± 3.23 Bannister Creek SWS2 1.61 ± 0.49 0.10 ± 0.05 0.42 ± 0.34 0.91 ± 0.24 0.08 ± 0.02 0.05 ± 0.01 23.31 ± 5.88 6.58 ± 2.94 6.42 ± 1.93 0.76 ± 0.25 Bayswater Main Drain SWS10 1.35 ± 0.27 0.20 ± 0.08 0.44 ± 0.11 0.54 ± 0.08 0.08 ± 0.06 0.02 ± 0.01 15.31 ± 2.56 12.23 ± 9.70 8.50 ± 0.72 0.71 ± 0.11 Bennett Brook SWN12 1.17 ± 0.29 0.04 ± 0.01 0.31 ± 0.12 0.71 ± 0.14 0.06 ± 0.03 0.03 ± 0.01 18.92 ± 3.42 6.65 ± 6.18 6.71 ± 0.92 0.60 ± 0.07 Bickley Brook SWS4 1.26 ± 0.76 0.03 ± 0.03 0.60 ± 0.76 0.52 ± 0.23 0.06 ± 0.05 0.02 ± 0.01 9.71 ± 5.52 4.52 ± 2.66 6.89 ± 2.63 1.09 ± 0.59 Blackadder Creek SWN8 1.02 ± 0.54 0.01 ± 0.01 0.42 ± 0.44 0.51 ± 0.12 0.04 ± 0.02 0.02 ± 0.01 9.64 ± 1.95 2.86 ± 2.62 7.51 ± 1.50 1.17 ± 0.29 SCCIS2 0.86 ± 0.23 0.11 ± 0.07 0.13 ± 0.10 0.54 ± 0.16 0.06 ± 0.01 0.04 ± 0.01 17.58 ± 4.71 4.85 ± 3.79 7.09 ± 1.89 0.63 ± 0.15 Bull Creek BAMDKD 0.91 ± 0.35 0.04 ± 0.02 0.15 ± 0.17 0.61 ± 0.20 0.11 ± 0.10 0.07 ± 0.07 17.50 ± 5.07 4.25 ± 9.80 6.06 ± 2.42 0.61 ± 0.15 Claise Brook MD CB 13 1.04 ± 0.34 0.09 ± 0.06 0.60 ± 0.19 0.26 ± 0.20 0.05 ± 0.03 0.02 ± 0.01 6.88 ± 3.60 5.79 ± 2.90 10.19 ± 2.68 0.68 ± 0.12 SWN3 2.65 ± 0.51 0.06 ± 0.02 0.11 ± 0.07 2.24 ± 0.46 0.49 ± 0.16 0.35 ± 0.12 51.31 ± 8.17 8.31 ± 5.22 7.31 ± 1.11 1.77 ± 0.49 Ellen Brook SWN9 1.69 ± 0.81 0.03 ± 0.02 0.19 ± 0.10 1.33 ± 0.67 0.20 ± 0.17 0.14 ± 0.14 33.12 ± 13.90 5.62 ± 5.05 5.72 ± 1.44 1.15 ± 0.31 Ellis Brook EBGS01 0.46 ± 0.20 0.03 ± 0.03 0.10 ± 0.12 0.27 ± 0.10 0.04 ± 0.03 0.02 ± 0.02 7.00 ± 1.60 4.69 ± 4.65 8.36 ± 1.18 0.58 ± 0.28 Helena River SWN10 0.84 ± 0.24 0.22 ± 0.16 0.17 ± 0.12 0.35 ± 0.10 0.02 ± 0.01 0.01 ± 0 7.94 ± 1.44 6.81 ± 3.83 4.97 ± 1.66 1.14 ± 0.38 Helm Street SCCIS4 1.20 ± 0.61 0.03 ± 0.01 0.37 ± 0.48 0.73 ± 0.51 0.07 ± 0.06 0.05 ± 0.04 11.95 ± 5.92 5.38 ± 8.00 7.44 ± 3.48 1.36 ± 0.95 Henley Brook HBBROCK 0.94 ± 0.27 0.05 ± 0.04 0.15 ± 0.16 0.61 ± 0.15 0.07 ± 0.03 0.03 ± 0.01 15.63 ± 2.67 8.13 ± 6.29 7.67 ± 1.47 0.57 ± 0.05 Jane Brook SWN7 0.85 ± 0.40 0.05 ± 0.03 0.34 ± 0.29 0.26 ± 0.11 0.03 ± 0.03 0.01 ± 0.01 5.57 ± 1.02 5.65 ± 8.57 7.20 ± 1.98 0.78 ± 0.21 Lower Canning SCCIS3 1.36 ± 0.55 0.04 ± 0.02 0.54 ± 0.54 0.66 ± 0.18 0.23 ± 0.09 0.19 ± 0.09 14.58 ± 3.01 5.19 ± 5.71 5.49 ± 2.40 0.91 ± 0.33 Maylands MIMDOUT 1.08 ± 0.11 0.08 ± 0.08 0.57 ± 0.10 0.40 ± 0.04 0.02 ± 0.01 0.01 ± 0.01 14.00 ± 1.11 2.21 ± 3.50 8.34 ± 0.42 0.74 ± 0.35 Mills Street Main Drain SWS1 0.95 ± 0.28 0.10 ± 0.08 0.22 ± 0.16 0.48 ± 0.13 0.14 ± 0.03 0.08 ± 0.02 12.04 ± 3.36 6.25 ± 5.78 5.97 ± 1.69 0.55 ± 0.15 Mounts Bay MD CCDRMBRD 1.10 ± 0.32 0.26 ± 0.06 0.36 ± 0.15 0.38 ± 0.12 0.05 ± 0.02 0.01 ± 0.01 7.22 ± 1.99 6.67 ± 2.12 8.27 ± 0.72 0.96 ± 0.45 Perth Airport North SCCIS12 0.64 ± 0.21 0.03 ± 0.01 0.14 ± 0.12 0.39 ± 0.10 0.03 ± 0.01 0.01 ± 0 10.08 ± 2.12 11.19 ± 19.35 8.29 ± 1.60 0.55 ± 0.18 Perth Airport South KANAV 0.99 ± 0.30 0.06 ± 0.05 0.20 ± 0.10 0.62 ± 0.21 0.05 ± 0.05 0.02 ± 0.02 20.24 ± 6.95 10.00 ± 9.14 9.20 ± 1.08 0.54 ± 0.20 Saint Leonards Creek SCCIN3 2.45 ± 0.60 0.05 ± 0.01 0.09 ± 0.06 2.18 ± 0.61 0.10 ± 0.03 0.05 ± 0.01 53.20 ± 13.02 5.50 ± 3.95 7.89 ± 0.82 0.81 ± 0.11 South Belmont SWS13 0.93 ± 0.26 0.07 ± 0.02 0.17 ± 0.11 0.60 ± 0.12 0.19 ± 0.06 0.13 ± 0.04 15.54 ± 3.26 3.10 ± 2.35 7.44 ± 1.27 0.69 ± 0.13
Department of Water and Environmental Regulation 265 Swan Canning Catchment Data Report January – December 2018
SCCIS1 0.72 ± 0.23 0.16 ± 0.16 0.08 ± 0.08 0.37 ± 0.10 0.02 ± 0.01 0 ± 0 11.31 ± 1.98 6.85 ± 4.19 3.66 ± 1.62 0.50 ± 0.09 South Perth WIFRD 1.37 ± 0.34 0.13 ± 0.03 0.25 ± 0.17 0.86 ± 0.27 0.20 ± 0.07 0.15 ± 0.05 23.37 ± 6.16 7.45 ± 11.21 6.67 ± 1.05 0.48 ± 0.10 SWS7 1.28 ± 0.36 0.03 ± 0.01 0.33 ± 0.24 0.81 ± 0.14 0.12 ± 0.03 0.08 ± 0.03 22.62 ± 4.87 4.88 ± 2.05 6.56 ± 1.68 0.79 ± 0.21 Southern River AW05 0.59 ± 0.37 0.07 ± 0.12 0.31 ± 0.25 0.12 ± 0.09 0.02 ± 0.02 0.01 ± 0.01 3.60 ± 1.45 6.67 ± 7.73 10.23 ± 0.87 0.29 ± 0.04 Susannah Brook SWN11 0.96 ± 0.41 0.02 ± 0.01 0.55 ± 0.36 0.31 ± 0.10 0.01 ± 0.01 0.01 ± 0 6.80 ± 1.32 2.15 ± 1.51 7.52 ± 1.40 0.60 ± 0.15 Upper Canning River SWS12 0.49 ± 0.35 0.03 ± 0.01 0.21 ± 0.24 0.19 ± 0.07 0.02 ± 0.01 0.01 ± 0 3.54 ± 0.95 2.69 ± 3.43 6.86 ± 2.10 0.62 ± 0.12 CSMDREID 1.23 ± 0.35 0.04 ± 0.01 0.55 ± 0.23 0.50 ± 0.19 0.16 ± 0.07 0.08 ± 0.03 13.31 ± 3.82 13.77 ± 18.50 9.31 ± 1.70 0.73 ± 0.17 Upper Swan WNDCK ------Yule Brook SWS3 0.95 ± 0.32 0.06 ± 0.05 0.24 ± 0.31 0.48 ± 0.14 0.13 ± 0.07 0.07 ± 0.05 10.15 ± 3.39 6.85 ± 4.07 4.38 ± 2.64 0.75 ± 0.20
* Please note: No data was collected at site WNDCK (Wandoo Creek catchment) for the entire 2018 calendar year, in part due to denial of access to the site by the landholder.
DISCLAIMER: A normal distribution of data is required to confidently predict standard deviation, and with a smaller sample size (as is often the case here) the assumption of normality is not necessarily correct.
266 Department of Water and Environmental Regulation Swan Canning Catchment Data Report January - December 2018
34 Perth rainfall This graph displays the rainfall (in millimetres) recorded in Perth from 1st January 2013 to 31st December 2018 on a monthly basis, as shown on the Bureau of Meteorology website (rainfall data for the Perth Metro site is used). Similarly to 2017; the graph illustrates the relative importance of summer rain events when they occur.
Perth Rainfall (2013 - 31st Dec 2018) 200 180 160 140 120 100 80 Rainfall (mm) Rainfall 60 40 20 0 Jul Jul Jul Jul Jul Jul Jan Jan Jan Jan Jan Jan Sep Sep Sep Sep Sep Sep Nov Nov Nov Nov Nov Nov Mar Mar Mar Mar Mar Mar May May May May May May 2013 2014 2015 2016 2017 2018
Figure 331 Perth’s rainfall 1st January 2013 to 31st December 2018.
Department of Water and Environmental Regulation 267