Technical Note 2 – Orange Water Resources
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TECHNICALNOTE2 ORANGEWATERRESOURCES PREPAREDFOR ORANGECITYCOUNCIL MAY2013 TECHNICAL NOTE 2 ORANGE WATER RESOURCES ORANGE CITY COUNCIL IWCM EVALUATION STUDY PREPARED FOR: ORANGE CITY COUNCIL MAY 2013 POSTAL ADDRESS PO BOX 1963 ORANGE NSW 2800 LOCATION 154 PEISLEY STREET ORANGE NSW 2800 TELEPHONE 02 6393 5000 FACSIMILE 02 6393 5050 EMAIL [email protected] WEB SITE WWW.GEOLYSE.COM TECHNICAL NOTE 2 ORANGE WATER RESOURCES ORANGE CITY COUNCIL Report Title: IWCM EVALUATION STUDY Project: Orange City Council IWCM Client: Orange City Council Report Ref.: OCC_IWCM_Technical Note 2_Final.docx Status: Final Issued: May 2013 Next review: June 2018 Cover Photos: Main – Suma Park Dam spillway (Source: OCC) Top – Suma Park Reservoir (Source: Kerry Fragar) Middle 1 – Stormwater harvesting batch pond (Source: Kerry Fragar) Middle 2 – Orange STP Trickling Filter (Source: OCC) Bottom – Harvested stormwater discharging to holding pond (Source: Martin Haege) This report has been prepared by Geolyse Pty Ltd for Orange City Council and may only be used and relied on by Orange City Council for the purposes for which it was prepared. The preparation of this report has been in accordance with the project brief provided by the client and has relied upon the information, data and results provided or collected from the sources and under the conditions outlined in the report. Geolyse otherwise disclaims responsibility to any person other than Orange City Council for liability howsoever arising from or in connection with this report. Geolyse also excludes implied warranties and conditions, to the extent legally possible. The opinions, conclusions and recommendations in this report are based on conditions encountered and information reviewed at the date of preparing this report. Geolyse has no responsibility or obligation to update this report to account for events or changes occurring subsequent to the date that the report was prepared. Geolyse reserves the right, at any time with or without notice, to amend, modify or retract any part or all of the report including any opinions, conclusions, or recommendations contained therein. Unauthorised use of this report in any form whatsoever is strictly prohibited. OCC_IWCM_TECHNICAL NOTE 2_FINAL.DOCX TECHNICAL NOTE 2 ORANGE WATER RESOURCES ORANGE CITY COUNCIL CONTENTS ABBREVIATIONS .................................................................................................... VII INTRODUCTION ........................................................................................................ 1 1.1 BACKGROUND .................................................................................................................. 1 1.2 SCOPE OF TECHNICAL NOTE 2 ...................................................................................... 2 1.3 LIMITATION OF TECHNICAL NOTE 2 .............................................................................. 2 1.4 REPORT STRUCTURE ...................................................................................................... 2 1.5 STUDY TEAM ..................................................................................................................... 3 1.6 ACKNOWLEDGEMENT ..................................................................................................... 3 METHODOLOGY ....................................................................................................... 4 2.1 INTRODUCTION ................................................................................................................ 4 2.2 SECURE YIELD .................................................................................................................. 4 2.2.1 WHAT IS SECURE YIELD? ................................................................................ 4 2.2.2 BASELINE SECURE YIELD ............................................................................... 5 2.2.3 5/10/10 VS 5/10/20 .............................................................................................. 6 2.2.4 APPROACH ........................................................................................................ 7 2.3 ORANGE WATER BALANCE MODEL ............................................................................... 7 2.3.1 DESCRIPTION .................................................................................................... 7 2.4 CLIMATE CHANGE ............................................................................................................ 9 2.5 FINANCIAL ANALYSIS..................................................................................................... 10 2.5.1 NET PRESENT VALUE .................................................................................... 10 2.5.2 TYPICAL RESIDENTIAL BILL .......................................................................... 10 2.6 GREENHOUSE GAS ........................................................................................................ 10 2.7 COMPARISON OF OPTIONS .......................................................................................... 11 WATER RESOURCES ............................................................................................ 12 3.1 INTRODUCTION .............................................................................................................. 12 3.2 SURFACE WATER ........................................................................................................... 12 3.2.1 INTRODUCTION ............................................................................................... 12 3.2.2 GOSLING CREEK DAM .................................................................................... 13 3.2.3 SPRING CREEK DAM ...................................................................................... 16 3.2.4 SUMA PARK DAM ............................................................................................ 18 3.2.5 LAKE CANOBOLAS .......................................................................................... 26 3.2.6 MACQUARIE RIVER TO ORANGE PIPELINE ................................................. 29 3.2.7 BURRENDONG DAM TO ORANGE PIPELINE ............................................... 40 3.2.8 MULYAN CREEK DAM ..................................................................................... 42 3.2.9 CADIA VALLEY OPERATIONS WATER INFRASTRUCTURE ........................ 50 3.2.10 MANAGING STORAGE EVAPORATION ......................................................... 50 3.2.11 LONG LIST RECOMMENDATIONS ................................................................. 51 3.3 STORMWATER ................................................................................................................ 52 3.3.1 EXISTING STORMWATER HARVESTING SCHEMES ................................... 52 3.3.2 BLACKMANS SWAMP CREEK 100% TRIGGER ............................................ 63 3.3.3 BLACKMANS SWAMP CREEK STAGE 2 ........................................................ 65 3.3.4 BLACKMANS SWAMP CREEK STAGE 3 ........................................................ 69 3.3.5 BLACKMANS SWAMP CREEK MAXIMUM HARVESTING ............................. 72 3.3.6 DOWNSTREAM STORMWATER HARVESTING ISSUES .............................. 75 3.3.7 UPSTREAM STORMWATER HARVESTING ................................................... 75 3.3.8 NORTHERN SUBURBS STORMWATER HARVESTING (BEER ROAD) ....... 79 3.3.9 LONG LIST RECOMMENDATIONS ................................................................. 81 3.4 RAINWATER TANKS ....................................................................................................... 81 PAGE I OCC_IWCM_TECHNICAL NOTE 2_FINAL.DOCX TECHNICAL NOTE 2 ORANGE WATER RESOURCES ORANGE CITY COUNCIL 3.4.1 INTRODUCTION ............................................................................................... 81 3.4.2 RAINWATER TANK REBATE POLICY............................................................. 82 3.4.3 ASSESSMENT OF RAINWATER TANKS ........................................................ 82 3.4.4 RESULTS .......................................................................................................... 85 3.4.5 USE OF RAINWATER TANKS AS A WATER SUPPLY OPTION .................... 88 3.4.6 SUMMARY ........................................................................................................ 89 3.4.7 LONG LIST RECOMMENDATION .................................................................... 89 3.5 GROUNDWATER ............................................................................................................. 89 3.5.1 SPRING HILL AND LUCKNOW ........................................................................ 89 3.5.2 EXISTING GROUNDWATER RESOURCES FOR ORANGE .......................... 90 3.5.3 POTENTIAL GROUNDWATER RESOURCES ................................................ 91 3.5.4 LONG LIST RECOMMENDATIONS ................................................................. 95 3.6 TREATED EFFLUENT...................................................................................................... 95 3.6.1 DESCRIPTION .................................................................................................. 95 3.6.2 VOLUME ........................................................................................................... 95 3.6.3 INDIRECT POTABLE REUSE .......................................................................... 99 3.6.4 LONG LIST RECOMMENDATIONS ..............................................................