Statistical analysis of river flow data in the Horizons Region
NIWA Client Report: CHC2006-154 May 2007
NIWA Project: ELF07202/HZLC22
Statistical analysis of river flow data in the Horizons Region
Roddy Henderson Jan Diettrich
Prepared for
Horizons Manawatu Regional Council
NIWA Client Report: CHC2006-154 May 2007 NIWA Project: ELF07202/HZLC22
National Institute of Water & Atmospheric Research Ltd 10 Kyle Street, Riccarton, Christchurch P O Box 8602, Christchurch, New Zealand Phone +64-3-348 8987, Fax +64-3-348 5548 www.niwa.co.nz
All rights reserved. This publication may not be reproduced or copied in any form without the permission of the client. Such permission is to be given only in accordance with the terms of the client's contract with NIWA. This copyright extends to all forms of copying and any storage of material in any kind of information retrieval system.
Contents
Executive Summary iv
1. Introduction 1
2. Flow statistics for water allocation planning 1 2.1. Flow quantity statistics 2 2.1.1. Mean flow 2 2.1.2. Median flow 2 2.2. Flow variability statistics 3 2.2.1. Seasonal variability 3 2.2.2.Flow distribution 3 2.3. Flow extremes 4 2.3.1. Mean annual flood 4 2.3.2. FRE3 and days of accrual 4 2.3.3. Sensitivity of FRE3 5 2.3.4. Mean annual low flow 9 2.4. Filtering 10 2.5. Temporal sampling 10 2.5.1. Western diversion 11 2.5.2. Eastern diversion 12 2.5.3. TPD as a whole 12 2.6. Synthetic time series 13 2.6.1. Temporal changes 13 2.6.2. Other synthetic records 14
3. Acknowledgements 16
4. Flow summaries 16 4.1. East Coast Catchments 20 4.1.1. Akitio at Weber (25003), Jul-1980 to Jul-2000 (all data) 22 4.1.2. Owahanga at Branscombe Br (1425101), Jul-1999 to Jul-2005 (all data) 24 4.2. Manawatu and Southern West Coast Catchments 26 4.2.1. Manakau at Gleesons Rd (32001), Jul-1979 to Jul-1989 (all data) 30 4.2.2. Ohau (Water Race) at d/s Culvert (32107), Jul-1991 to Jul-1994 (all data) 32 4.2.3. Ohau at Rongomatane (32106), Jul-1978 to Jul-2004 (all data) 34 4.2.4. Ohau at Water Race (32105), Jul-1974 to Jul-1978 (all data) 36 4.2.5. Kiwitea at Spur Rd All (200), Jul-1977 to Jul-2005 (all data) 38 4.2.6. Kumeti at SH2(Napier) (32599), Jul-1975 to Jul-1980 (all data) 40 4.2.7. Kumeti at Te Rehunga (1032501), Jul-1981 to Jul-2004 (all data) 42 4.2.8. Makakahi at Hamua (1032518), Jul-1980 to Jul-2005 (all data) 44 4.2.9. Makino at Boness Rd (1032564), Jul-1992 to Jul-2006 (all data) 46
4.2.10. Makuri at Tuscan Hills (1032591), Jul-2001 to Jul-2006 (all data) 48 4.2.11. Manawatu at Hopelands (32504), Jul-1948 to Jul-2005 (all data) 50 4.2.12. Manawatu at Opiki (synthetic) (1932501), Jul-1980 to Jul-2006 (all data) 52 4.2.13. Manawatu at Palmerston North All (300), Jul-1923 to Jul-2005 (all data) 54 4.2.14. Manawatu at Upper Gorge (1232566), Jul-1979 to Jul-2003 (all data) 56 4.2.15. Manawatu at Weber Rd (32503), Jul-1955 to Jul-2004 (all data) 58 4.2.16. Manga-Atua at Hopelands Rd (1232564), Jul-1980 to Jul-1989 (all data) 60 4.2.17. Mangahao at Ballance (32526), Jul-1962 to Jul-2004 (all data) 62 4.2.18. Mangatainoka at Larsons Br (1032555), Jul-1983 to Jul-2006 (all data) 64 4.2.19. Mangatainoka at Pahiatua All (400), Jul-1954 to Jul-2005 (all data) 66 4.2.20. Mangatera at Dannevirke 1 (synthetic) (32541), Jul-1955 to Jul-2004 (all data) 68 4.2.21. Mangatera at Dannevirke 2 (synthetic) (500), Jul-1955 to Jul-2004 (all data) 70 4.2.22. Oroua at Almadale All (800), Jul-1948 to Jul-2004 (all data) 72 4.2.23. Oroua at Awahuri Br (1932512), Jul-1992 to Jul-2004 (all data) 74 4.2.24. Oroua at Kawa Wool (synthetic) (700), Jul-1967 to Jul-2004 (all data) 76 4.2.25. Pohangina at Mais Reach (32576), Jul-1969 to Jul-2005 (all data) 78 4.2.26. Tamaki at SH2(Napier) (1032503), Jul-1977 to Jul-1983 (all data) 80 4.2.27. Tamaki at Stephensons (1332556), Dec-2003 to Apr-2005 (all data) 82 4.2.28. Tamaki at Water Supply Weir (1032504), Jul-1983 to Jul-2004 (all data) 84 4.2.29. Tiraumea at Ngaturi (32529), Jul-1980 to Jul-2004 (all data) 86 4.2.30. Tokomaru All (900), Jul-1980 to Jul-2005 (all data) 88 4.2.31. Turitea at Ngahere Park Rd (1132501), Jul-2001 to Jul-2006 (all data) 90 4.2.32. Puke Puke at Lake Outlet (32602), Jul-1971 to Jul-1980 (all data) 92 4.3. Rangitikei Catchments 95 4.3.1. Forest Rd Drain at Drop Structure (32747), Jul-1974 to Jul-2006 (all data) 98 4.3.2. Hautapu Taihape All (100), Jul-1963 to Jul-2004 (all data) 100 4.3.3. Makohine at Viaduct (32754), Jul-1977 to Jul-2004 (all data) 102 4.3.4. Maungaraupi at Maungaraupi (32723), Jul-1970 to Jul-1975 (all data) 104 4.3.5. Moawhango at Moawhango (32733), Jul-1964 to Jul-2005 (all data) 106 4.3.6. Moawhango at Moawhango (32733), Jul-1964 to Jul-1978 (pre- diversion) 108 4.3.7. Moawhango at Moawhango (32733), Jul-1979 to Jul-2004 (post- diversion) 110 4.3.8. Moawhango at Moawhango (sim natural) (327330), Jul-1964 to Jul- 2003 (all data) 112 4.3.9. Moawhango at Moawhango (sim natural) (327330), Jul-1964 to Jul- 1978 (pre-diversion) 114 4.3.10. Moawhango at Moawhango (sim natural) (327330), Jul-1979 to Jul- 2003 (post-diversion) 116
4.3.11. Moawhango at Waiouru (32732), Jul-1960 to Jul-2005 (all data) 118 4.3.12. Moawhango at Waiouru (32732), Jul-1960 to Jul-1978 (pre-diversion) 120 4.3.13. Moawhango at Waiouru (32732), Jul-1979 to Jul-2004 (post-diversion) 122 4.3.14. Moawhango at Waiouru (sim natural) (46060), Jul-1960 to Jul-2003 (all data) 124 4.3.15. Moawhango at Waiouru (sim natural) (46060), Jul-1960 to Jul-1978 (pre-diversion) 126 4.3.16. Moawhango at Waiouru (sim natural) (46060), Jul-1979 to Jul-2003 (post-diversion) 128 4.3.17. Porewa at Tututotara (32715), Jul-1963 to Jul-1991 (all data) 130 4.3.18. Rangitawa at Halcombe (32735), Jul-1969 to Jul-1980 (all data) 132 4.3.19. Rangitikei at Mangaweka (32702), Jul-1969 to Jul-2004 (all data) 134 4.3.20. Rangitikei at Mangaweka (32702), Jul-1969 to Jul-1978 (pre-diversion) 136 4.3.21. Rangitikei at Mangaweka (32702), Jul-1979 to Jul-2004 (post- diversion) 138 4.3.22. Rangitikei at Mangaweka (sim natural) (327020), Jul-1963 to Jul-2003 (all data) 140 4.3.23. Rangitikei at Mangaweka (sim natural) (327020), Jul-1963 to Jul-1978 (pre-diversion) 142 4.3.24. Rangitikei at Mangaweka (sim natural) (327020), Jul-1979 to Jul-2003 (post-diversion) 144 4.3.25. Rangitikei at Onepuhi (32703), Jul-2002 to Jul-2005 (post-diversion) 146 4.3.26. Rangitikei at Otara (32705), Jul-1963 to Jul-1969 (pre-diversion) 148 4.3.27. Rangitikei at Pukeokahu (32763), Jul-1999 to Jul-2005 (post-diversion) 150 4.3.28. Rangitikei at Springvale (32708), Jul-1964 to Jul-1973 (all data) 152 4.3.29. Tutaenui at Hammond St (32739), Jul-1968 to Jul-1987 (all data) 154 4.4. Turakina and Whangaehu Catchments 156 4.4.1. Turakina at Otairi (33004), Jul-1991 to Jul-2004 (all data) 158 4.4.2. Turakina at SH3 Br (33003), Jul-1977 to Jul-1992 (all data) 160 4.4.3. Makotuku at SH 49A Br (33117), Jul-1968 to Jul-2005 (all data) 162 4.4.4. Mangaetoroa at School (33115), Jul-1969 to Jul-2004 (all data) 164 4.4.5. Mangawhero at Ohakune All (600), Jul-1975 to Jul-2005 (all data) 166 4.4.6. Mangawhero at Ore Ore (33111), Jul-1962 to Jul-2004 (all data) 168 4.4.7. Tokiahuru at Whangaehu Junction (33112), Jul-1980 to Jul-1993 (post- diversion) 170 4.4.8. Wahianoa at Karioi (33116), Jul-1968 to Jul-1972 (pre-diversion) 172 4.4.9. Waitangi at Tangiwai (33114), Jul-1968 to Jul-1991 (all data) 174 4.4.10. Whangaehu at Karioi (33107), Jul-1963 to Jul-2003 (all data) 176 4.4.11. Whangaehu at Karioi (33107), Jul-1963 to Jul-1978 (pre-diversion) 178 4.4.12. Whangaehu at Karioi (33107), Jul-1979 to Jul-2003 (post-diversion) 180 4.4.13. Whangaehu at Karioi (sim natural) (331070), Jul-1963 to Jul-2003 (all data) 182 4.4.14. Whangaehu at Karioi (sim natural) (331070), Jul-1963 to Jul-1978 (pre- diversion) 184 4.4.15. Whangaehu at Karioi (sim natural) (331070), Jul-1979 to Jul-2003 (post-diversion) 186
4.4.16. Whangaehu at Kauangaroa (33101), Jul-1971 to Jul-2004 (all data) 188 4.4.17. Whangaehu at Kauangaroa (33101), Jul-1971 to Jul-1978 (pre- diversion) 190 4.4.18. Whangaehu at Kauangaroa (33101), Jul-1979 to Jul-2004 (post- diversion) 192 4.4.19. Whangaehu at Kauangaroa (sim natural) (331010), Jul-1971 to Jul-1994 (all data) 194 4.4.20. Whangaehu at Kauangaroa (sim natural) (331010), Jul-1971 to Jul-1978 (pre-diversion) 196 4.4.21. Whangaehu at Kauangaroa (sim natural) (331010), Jul-1979 to Jul-1994 (post-diversion) 198 4.5. Whanganui Catchments and Kai Iwi 200 4.5.1. Manganui-o-te-ao at Ashworth (33309), Jul-1962 to Jul-1980 (all data) 204 4.5.2. Mangaroa at Ohura Town Br (33341), Jul-1965 to Jul-1970 (all data) 206 4.5.3.Ohura at Tokorima (33313), Jul-1962 to Jul-2005 (all data) 208 4.5.4. Ongarue at Taringamotu (33316), Jul-1963 to Jul-2004 (all data) 210 4.5.5. Tangarakau at Tangarakau (33311), Jul-1962 to Jul-1968 (all data) 212 4.5.6. Whakapapa at Footbridge (33320), Jul-1960 to Jul-2000 (all data) 214 4.5.7. Whakapapa at Footbridge (33320), Jul-1960 to Jul-1972 (pre-diversion) 216 4.5.8. Whakapapa at Footbridge (33320), Jul-1973 to Jul-1983 (1972 rules) 218 4.5.9. Whakapapa at Footbridge (33320), Jul-1984 to Jul-1992 (1983 rules) 220 4.5.10. Whakapapa at Footbridge (33320), Jul-1993 to Jul-2000 (Planning Tribunal 1990) 222 4.5.11. Whakapapa at Footbridge (sim natural) (333001), Jul-1960 to Jul-2003 (all data) 224 4.5.12. Whakapapa at Footbridge (sim natural) (333001), Jul-1960 to Jul-1972 (pre-diversion) 226 4.5.13. Whakapapa at Footbridge (sim natural) (333001), Jul-1973 to Jul-1983 (1972 rules) 228 4.5.14. Whakapapa at Footbridge (sim natural) (333001), Jul-1984 to Jul-1992 (1983 rules) 230 4.5.15. Whakapapa at Footbridge (sim natural) (333001), Jul-1993 to Jul-2003 (Planning Tribunal 1990) 232 4.5.16. Whakapapa at Footbridge (sim consent) (8005), Jul-1962 to Jul-2003 (all data) 234 4.5.17. Whakapapa at Footbridge (sim consent) (8005), Jul-1962 to Jul-1972 (pre-diversion) 236 4.5.18. Whakapapa at Footbridge (sim consent) (8005), Jul-1973 to Jul-1983 (1972 rules) 238 4.5.19. Whakapapa at Footbridge (sim consent) (8005), Jul-1984 to Jul-1992 (1983 rules) 240 4.5.20. Whakapapa at Footbridge (sim consent) (8005), Jul-1993 to Jul-2003 (Planning Tribunal 1990) 242 4.5.21. Whanganui at Matapuna (33338), Jul-1964 to Jul-1972 (pre-diversion) 244 4.5.22. Whanganui at Paetawa (33301), Jul-1957 to Jul-2004 (all data) 246 4.5.23. Whanganui at Paetawa (33301), Jul-1957 to Jul-1972 (pre-diversion) 248 4.5.24. Whanganui at Paetawa (33301), Jul-1973 to Jul-1983 (1972 rules) 250
4.5.25. Whanganui at Paetawa (33301), Jul-1984 to Jul-1992 (1983 rules) 252 4.5.26. Whanganui at Paetawa (33301), Jul-1993 to Jul-2004 (Planning Tribunal 1990) 254 4.5.27. Whanganui at Paetawa (sim natural) (333005), Jul-1951 to Jul-2003 (all data) 256 4.5.28. Whanganui at Paetawa (sim natural) (333005), Jul-1951 to Jul-1972 (pre-diversion) 258 4.5.29. Whanganui at Paetawa (sim natural) (333005), Jul-1973 to Jul-1983 (1972 rules) 260 4.5.30. Whanganui at Paetawa (sim natural) (333005), Jul-1984 to Jul-1992 (1983 rules) 262 4.5.31. Whanganui at Paetawa (sim natural) (333005), Jul-1993 to Jul-2003 (Planning Tribunal 1990) 264 4.5.32. Whanganui at Paetawa (sim consent) (8005), Jul-1962 to Jul-2003 (all data) 266 4.5.33. Whanganui at Paetawa (sim consent) (8005), Jul-1962 to Jul-1972 (pre- diversion) 268 4.5.34. Whanganui at Paetawa (sim consent) (8005), Jul-1973 to Jul-1983 (1972 rules) 270 4.5.35. Whanganui at Paetawa (sim consent) (8005), Jul-1984 to Jul-1992 (1983 rules) 272 4.5.36. Whanganui at Paetawa (sim consent) (8005), Jul-1993 to Jul-2003 (Planning Tribunal 1990) 274 4.5.37. Whanganui at Piriaka (33356), Jul-1971 to Jul-2003 (all data) 276 4.5.38. Whanganui at Piriaka (33356), Jul-1973 to Jul-1983 (1972 rules) 278 4.5.39. Whanganui at Piriaka (33356), Jul-1984 to Jul-1992 (1983 rules) 280 4.5.40. Whanganui at Piriaka (33356), Jul-1993 to Jul-2003 (Planning Tribunal 1990) 282 4.5.41. Whanganui at Piriaka (sim natural) (33300), Jul-1964 to Jul-2003 (all data) 284 4.5.42. Whanganui at Piriaka (sim natural) (33300), Jul-1964 to Jul-1972 (pre- diversion) 286 4.5.43. Whanganui at Piriaka (sim natural) (33300), Jul-1973 to Jul-1983 (1972 rules) 288 4.5.44. Whanganui at Piriaka (sim natural) (33300), Jul-1984 to Jul-1992 (1983 rules) 290 4.5.45. Whanganui at Piriaka (sim natural) (33300), Jul-1993 to Jul-2003 (Planning Tribunal 1990) 292 4.5.46. Whanganui at Piriaka (sim consent) (8005), Jul-1964 to Jul-2003 (all data) 294 4.5.47. Whanganui at Piriaka (sim consent) (8005), Jul-1964 to Jul-1972 (pre- diversion) 296 4.5.48. Whanganui at Piriaka (sim consent) (8005), Jul-1973 to Jul-1983 (1972 rules) 298 4.5.49. Whanganui at Piriaka (sim consent) (8005), Jul-1984 to Jul-1992 (1983 rules) 300 4.5.50. Whanganui at Piriaka (sim consent) (8005), Jul-1993 to Jul-2003 (Planning Tribunal 1990) 302 4.5.51. Whanganui at Te Maire (33302), Jul-1962 to Jul-2004 (all data) 304
4.5.52. Whanganui at Te Maire (33302), Jul-1962 to Jul-1972 (pre-diversion) 306 4.5.53. Whanganui at Te Maire (33302), Jul-1973 to Jul-1983 (1972 rules) 308 4.5.54. Whanganui at Te Maire (33302), Jul-1984 to Jul-1992 (1983 rules) 310 4.5.55. Whanganui at Te Maire (33302), Jul-1993 to Jul-2004 (Planning Tribunal 1990) 312 4.5.56. Whanganui at Te Maire (sim natural) (33300), Jul-1962 to Jul-2003 (all data) 314 4.5.57. Whanganui at Te Maire (sim natural) (33300), Jul-1962 to Jul-1972 (pre-diversion) 316 4.5.58. Whanganui at Te Maire (sim natural) (33300), Jul-1973 to Jul-1983 (1972 rules) 318 4.5.59. Whanganui at Te Maire (sim natural) (33300), Jul-1984 to Jul-1992 (1983 rules) 320 4.5.60. Whanganui at Te Maire (sim natural) (33300), Jul-1993 to Jul-2003 (Planning Tribunal 1990) 322 4.5.61. Whanganui at Te Maire (sim consent) (8005), Jul-1962 to Jul-2003 (all data) 324 4.5.62. Whanganui at Te Maire (sim consent) (8005), Jul-1962 to Jul-1972 (pre-diversion) 326 4.5.63. Whanganui at Te Maire (sim consent) (8005), Jul-1973 to Jul-1983 (1972 rules) 328 4.5.64. Whanganui at Te Maire (sim consent) (8005), Jul-1984 to Jul-1992 (1983 rules) 330 4.5.65. Whanganui at Te Maire (sim consent) (8005), Jul-1993 to Jul-2003 (Planning Tribunal 1990) 332 4.5.66. Whanganui at Te Porere (33347), Jul-1966 to Jul-2001 (all data) 334 4.5.67. Kai Iwi at Handley Rd (33502), Jul-1978 to Jul-2004 (all data) 336
Appendix 1: Detailed tables per site separate document
Reviewed by: Approved for release by:
Ross Woods Charles Pearson
Executive Summary
Horizons Regional Council is currently researching water quality standards and water allocation options for the various water management zones within the Region. A key parameter within these projects is sound analysis of the available flow data. This project seeks to document the flow statistics for the available continuous flow data records within the Horizons Region.
NIWAs experience in flow analysis and reporting has been applied to the problem of documenting the flow statistics of the Horizons Region. A set of flow statistics has been compiled that allow a succinct description of a flow series from each recording site, and facilitate comparison between sites. The statistics selected cover the areas of magnitude (how much water), variability (flow duration, seasonal behaviour), flow extremes (mean annual flood and low flow), and frequency of eco-system disturbance (FRE3). Effects on river flows of changes in management rules are dealt with by analysing different rule periods separately, and also by using synthetic records that allow rules to be assessed over a complete time period. This is important to avoid confusion between effects of rule changes and effects of climate variability. Flow duration curves and ecological disturbance indices are presented on a seasonal as well as an annual basis.
For each flow record, summary tables showing date range, basic flow statistics, flow variability statistics, and flood and flow statistics. Plots of seasonal variation are also provided, and an appendix (in a separate document) gives complete details of flow duration tables for whole years and seasonal analysis, annual flood and low flow values, and tables of number of days per month below mean annual low flow.
Statistical analysis of river flow data in the Horizons Region iv
1. Introduction
Horizons Regional Council is currently researching water quality standards and water allocation options for the various water management zones within the Region. A key requirement within these projects is sound analysis of the available flow data. This project seeks to document the flow statistics for the available continuous flow data records within the Horizons Region. A likely further step (not included in this project) is the calculation of flow statistics for areas where flow information is not collected on a continuous basis.
NIWAs experience in flow analysis and reporting has been applied to the problem of documenting the flow statistics of the Horizons Region.
In general the data have been taken on an as-is-where-is basis. Only cursory quality checking has been dome as data tables and plots were scrutinised. Some inter-site comparisons such as cumulative departure from mean plots would provide firstly a graphical representation of regional wet and dry periods and secondly a qualitative check on overall data integrity, as has been done for long New Zealand records1. The summary tables in section 3 of this report contain statistics which are derived in some cases from more detailed tables that are presented in the appendix document.
The flow statistics contained in this document were derived primarily for water allocation/water quality management purposes with an emphasis on low flow parameters. The flood flow information should be used with caution, and if required for any significant design purpose an update of the flood statistics should be requested from the recording authority.
Data for this report were provided from the archives of Horizons Regional Council and the Water Resources Archive (NIWA). Many of the sites from the NIWA archive were funded by Genesis Energy and its predecessors, as was analysis of flows below the TPD scheme, and simulation of natural flows and current consent conditions. We thank Genesis for their permission to use the data and analyses.
2. Flow statistics for water allocation planning
Flow records collected at river stations are usually at a short time interval of the order of 15 minutes. A good record length is considered to be at least ten years and
1 McKerchar, A. I. and C. P. Pearson (1997). Quality of Long Flow Records for New Zealand Rivers. Journal of Hydrology (NZ) 36(1): 15-41.
Statistical analysis of river flow data in the Horizons Region 1
preferably twenty, with more being desirable in some parts of New Zealand where decadal influences on climate and river flow have been observed. Large quantities of data are accumulated. Descriptions of these data are generally tailored to each particular application. There are few generic statistics that are universally required or requested. This is because hydrological data vary over a wide range of time scales, may not be stationary because of changes to management upstream and also because applications are often concerned with specific aspects of the hydrology. However it is possible to draw up a short list of useful statistics that begin to define a hydrological time series. Such a list seeks to define the flow magnitude and its variability and uncertainty. Flow magnitude is of interest to abstractive users such as irrigation and hydro power generation. Variability is of interest to all water users whether out of river or in-stream. Uncertainty is of interest to scheme designers and economists concerned for their clients exposure to risk over the life of a potential scheme. For water allocation planning there is generally an interest in the lower end of the flow range, below the median. Floods are also of significance when designing intake structures, preventing sediment entering distribution systems, and when considering ecological disturbance in river beds.
2.1. Flow quantity statistics
2.1.1. Mean flow
Mean flow is a fundamental statistic of a flow record. It is the area under the hydrograph (the time series plot of varying river flow) divided by the length of the hydrograph. It is usually expressed as flow in L/s or m3/s (cumecs), although units of Ml/day are often used in water supply work and cumec-days (CMD) in hydro-power applications. Depth of runoff (mm/time interval, the mean flow divided by the catchment area at the flow recorder) is more easily compared with other catchment wide variables such as rainfall or evapo-transpiration.
2.1.2. Median flow
Median flow is the flow that is equalled or exceeded half the time over the period of analysis. Median differs from mean because flow is not a normally distributed quantity. Rivers in the Horizons Region spend only about 30% of the time above the mean (standard deviation 5%), but these flows can be very large. Conversely the flow is below the mean about 70% of the time, but these lower flows are bounded by zero flow as a lower limit.
Statistical analysis of river flow data in the Horizons Region 2
2.2. Flow variability statistics
Amount of flow varies with time, over a wide range of time scales. In some parts of New Zealand there is variability on decadal time scales, but this is not evident in previous studies of the flow records from the Horizons Region. There is considerable variability from year to year, and this can be captured by use of annual average flows and their spread measured by a statistic such as standard deviation or coefficient of variation (standard deviation divided by the mean). As with other variability statistics, there is a general gradient from west to east in New Zealand, with variability being lower on the western side of both islands and greater on the east.
2.2.1. Seasonal variability
One measure of seasonal variability is the distribution of monthly mean flows, and this can be presented graphically, to show the average seasonal behaviour. By considering each month in turn, and calculating the quartiles (flow values that are equalled or exceeded one quarter and three quarters of the time) the year to year variability of seasonal behaviour may also be illustrated.
2.2.2. Flow distribution
The spread of flows can be represented by considering the range (maximum minimum), or alternatively the inter-quartile range, which is less affected by extremes of flood or drought. This measure of spread can also be applied to the seasonal flow variability on a monthly basis. A more detailed presentation of flow distribution is the flow duration curve (FDC). This curve plots each flow against the percentage of time that that flow is equalled or exceeded in the time period being analysed.
The lower end of the flow duration curve (FDC) is a useful descriptor of water availability for abstractive uses. Generally the minimum flow required to remain in the river is the mean annual low flow (MALF) or a fraction of it, or alternatively a high exceedance percentile, such as the flow equalled or exceeded 95% (or similar) of the time. The amount of water between such a flow requirement and the scheme capacity to divert is very sensitive to both the choice of minimum flow and the shape of the FDC.
Statistical analysis of river flow data in the Horizons Region 3
2.3. Flow extremes
High flows and low flows are characterised in several ways; by the top or bottom 5%- 10% of the FDC, by some multiple or fraction of the mean flow or median, or by use of extreme value sampling.
2.3.1. Mean annual flood
Mean annual flood (MAF) is the average of the highest instantaneous flow measurement from each year. The definition of a water year is generally not as important for New Zealand floods as it is for the mean annual low flow calculation (see below). The ratio of MAF to mean and low flow statistics is one useful indicator of the magnitude of disturbance. These ratios allow comparison between sites, and relate to the gradient of river environment from benign (low ratios of flood/mean or flood/low flow) to harsh (high ratios). Mean annual flood in this report is calculated on a calendar year rather than a water year, and thus for many sites there are one or two fewer annual values than for the MALF analysis.
The major floods of February 2004 have not been registered at every site, as some were damaged by the flood. In addition, no checking has been done of the effect of missing values in the annual flood series. Thus the mean annual flood values and annual series presented in this report should be treated with caution if using them for design purposes.
2.3.2. FRE3 and days of accrual
The flow which is three times the median flow is a common high flow statistic used in assessment of biological disturbance. The frequency of floods this size or larger (FRE3 expressed as number per year or season for a seasonal analysis) is used as an index of the amount of disturbance experienced by instream organisms. Ecosystem composition (periphyton and invertebrates) in New Zealand rivers and streams varies in a predictable way with this statistic2.
Figure 9 in the New Zealand Periphyton Guideline shows an idealised periphyton accrual cycle, where peak biomass at the end of the accrual phase is followed by a loss phase in which various processes lead to a reduction in biomass and an eventual lower carrying capacity value. This idealised function does not commonly happen in rivers,
2 Clausen, B. and B. J. F. Biggs (1997). Relationships between benthic biota and hydrological indices in New Zealand streams. Freshwater Biology 38: 327-342.
Statistical analysis of river flow data in the Horizons Region 4
because periphyton communities are of mixed species composition, they are spread over a river bed in space and floods often interrupt the process.
The average time between a flood larger than three times the median flow and the next flood of similar magnitude defines the average accrual time that organisms such as periphyton have available to recover and grow (possibly to nuisance levels). This value can be used in the regression equations for peak chlorophyll a, as contained in the New Zealand Periphyton Guideline. Calculation of FRE3 uses one additional parameter that is the time between floods required to initiate accrual. This could vary depending on the species of periphyton that are important in a particular river, as they have different growth rates and susceptibility to sloughing with age. For example the invasive alga Didymosphenia geminata (Didymo) is quicker to recolonise, faster spreading and more resistant to sloughing than any native species. However since Didymo is not yet a feature of North Island waterways, for the present work we have adopted an inter-flood time of five days, as used in the analyses reported in the papers that informed the New Zealand Periphyton Guideline. This means that after flow recedes below three times the median, a new accrual phase is not begun unless the flow remains below that level for five days.
Periphyton accumulation is a combined result of hydrology, nutrients, temperature and species composition and distribution. Recent research on periphyton ecology suggests that riparian shading is an important factor not yet included in models. Also the work currently being done on chemical control of Didymo could have some relevance in controlling filamentous green algae blooms in other rivers.
Analysis of annual FRE3 values has been included here for the first time. Both the annual and seasonal statistics contain the standard deviation of the annual or seasonal FRE3 statistic. It should be noted that the medians used for the all year and dry season analyses of FRE3 are the medians from the respective periods. Thus the dry season FRE3 is a subset of the all year value, and not a distinct period, so that comparisons between these two statistics should be made with caution. A wet season FRE3 could be a better statistic if comparisons are required.
2.3.3. Sensitivity of FRE3
Analysis of the sensitivity of FRE3 to parameters used in the calculation has been done and the results are reported here. Three flow records were nominated by Horizons staff: Manawatu at Palmerston North; Tamaki at Water Supply Weir; and Mangatainoka at Pahiatua. For each site FRE3 analysis was run for whole years and the summer season (November to April inclusive). Annual FRE3 values and their
Statistical analysis of river flow data in the Horizons Region 5
coefficients of variation (CV), and the average accrual time and its CV, are presented in Tables 1 to 4, and plots of the relative changes to these four parameters are shown in Figures 1 to 4.
Table 1: Effect of varying averaging interval and interflood spacing on FRE3 at three flow sites
Site FRE3 averaging interval0 s 1 h 3 h 6 h 12 h 24 h 24 h 24 h 24 h interflood spacing5 d 5 d 5 d 5 d 5 d 5 d 7 d 14 d 31 d Manawatu 15.3 15.2 14.9 14.3 13.2 11.7 10.6 8.1 5.3 Tamaki 12.8 12.6 11.9 11.3 10.2 8.8 8.1 6.6 4.6 Mangatainoka 18.4 18.0 17.6 17.1 16.3 14.5 12.8 9.5 5.9
Table 2: Effect of varying averaging interval and interflood spacing on FRE3 annual CV at three flow sites
Site FRE3 CV averaging interval0 s1 h 3 h 6 h 12 h 24 h 24 h 24 h 24 h interflood spacing5 d5 d 5 d 5 d 5 d 5 d 7 d 14 d 31 d Manawatu 21%21% 20% 20% 22% 24% 21% 22% 24% Tamaki 23%21% 22% 23% 26% 28% 27% 25% 28% Mangatainoka 15%16% 16% 18% 18% 20% 21% 20% 19%
Table 3: Effect of varying averaging interval and interflood spacing on mean accrual at three flow sites
Site Mean Accrual averaging interval0 s1 h 3 h 6 h 12 h 24 h 24 h 24 h 24 h Interflood spacing5 d5 d 5 d 5 d 5 d 5 d 7 d 14 d 31 d Manawatu 21.021.0 21.4 22.4 24.2 27.1 30.1 39.4 60.6 Tamaki 25.125.5 26.6 27.9 30.8 35.3 38.4 47.3 68.8 Mangatainoka 16.716.9 17.2 17.7 18.5 20.7 23.4 31.5 50.7
Table 4: Effect of varying averaging interval and interflood spacing on mean accrual CV at three flow sites
Site Accrual CV averaging interval0 s 1 h 3 h 6 h 12 h 24 h 24 h 24 h 24 h interflood spacing5 d 5 d 5 d 5 d 5 d 5 d 7 d 14 d 31 d Manawatu 102%103%104%105%111% 120% 110% 90% 63% Tamaki 96%95% 95% 98% 103% 110% 103% 85% 63% Mangatainoka 93%93% 94% 98% 106% 111% 101% 81% 54%
Statistical analysis of river flow data in the Horizons Region 6
160%
140%
120%
100% Decreasing averaging interval
80%
60%
40% Manawatu Tamaki Increasing inter-flood spacing Mangatainoka 20%
0% 0 s; 5 d1 h; 5 d3 h; 5 d6 h; 5 d12 h; 5 d24 h; 5 d24 h; 7 d24 h; 14 d24 h; 31 d Averaging Interval (h); Inter-flood Spacing (d)
Figure 1: Relative change to FRE3 at three sites by varying averaging interval and interflood spacing
120%
100%
80%
Decreasing averaging intervalIncreasing inter-flood spacing
60%
40%
Manawatu 20% Tamaki Mangatainoka
0% 0 s; 5 d1 h; 5 d3 h; 5 d6 h; 5 d12 h; 5 d24 h; 5 d24 h; 7 d24 h; 14 d24 h; 31 d Averaging Interval (h); Inter-flood Spacing (d)
Figure 2: Relative change to FRE3 annual CV at three sites by varying averaging interval and interflood spacing
Statistical analysis of river flow data in the Horizons Region 7
300%
250%
Increasing inter-flood spacing
200%
150%
Decreasing averaging interval
100%
50% Manawatu Tamaki Mangatainoka
0% 0 s; 5 d1 h; 5 d3 h; 5 d6 h; 5 d12 h; 5 d24 h; 5 d24 h; 7 d24 h; 14 d24 h; 31 d Averaging Interval (h); Inter-flood Spacing (d)
Figure 3: Relative change to mean accrual at three sites by varying averaging interval and interflood spacing
120%
100%
80%
Decreasing averaging interval
60%
Increasing inter-flood spacing
40%
Manawatu 20% Tamaki Mangatainoka
0% 0 s; 5 d1 h; 5 d3 h; 5 d6 h; 5 d12 h; 5 d24 h; 5 d24 h; 7 d24 h; 14 d24 h; 31 d Averaging Interval (h); Inter-flood Spacing (d)
Figure 4: Relative change to accrual CV at three sites by varying averaging interval and interflood spacing
Statistical analysis of river flow data in the Horizons Region 8
2.3.4. Mean annual low flow
Mean annual low flow (MALF) is the average of the lowest flow measured in each year of record. For the North Island of New Zealand the water year recommended is July to June, because significant droughts often begin in December. If a calendar year is used, then low flows from the same event may appear as the lowest value in two different years, thus biasing the sample.
Low flows can be sampled from the data as instantaneous flows, or as moving means over a range of averaging intervals. Commonly used intervals in New Zealand are one day, seven days and one month. A seven day interval is the most relevant when considering ecological processes because it smoothes out short term flow fluctuations that are less important to biota, and concentrates on longer low flow events that dry out parts of the river bed. In the present study a one day interval has been specified by the client because rivers of the region respond quickly over this time range in flow ranges where water use is important. A one day interval for calculation of mean annual low flow is consistent with the one day maximum daily rate consent limits used in allocating water within the region.
MALF is widely used as an estimate of the flow required in a river or stream to support biological processes and ecosystem function. It provides a general estimate of in-stream flow requirements when first considering the amount of water that might be potentially available for out of stream use. For larger rivers, especially single-thread rivers, MALF can be an over-estimate of the instream requirement for water, depending on the values to be conserved. The Tekapo, Waiau (Southland) and Moawhango Rivers are all rivers where minima smaller than the MALF have been shown to produce healthy ecosystem values when supplemented with managed releases to maintain a flushing regime (in effect use of FRE3 principles). For larger rivers, as significant water resources which may be subject to major investment in water related infrastructure, more detailed analysis involving Instream Flow Incremental Methodology (IFIM) is recommended as a more robust way to determine instream flow requirements than rule-of-thumb methods based on MALF. This view is based on extensive application and testing of the use of IFIM to determine flows to protect instream values3. We are also very familiar with rules-of-thumb methods and consider them to be useful first step planning tools, but fairly blunt when assessing specific requirements to maintain values such as salmonid habitat and biodiversity.
3 Jowett, I. G. and B. J. F. Biggs (2006). Flow regime requirements and the biological effectiveness of habitat-based minimum flow assessments for six rivers. International Journal of River Basin Management 4(2): 1-11.
Statistical analysis of river flow data in the Horizons Region 9
2.4. Filtering
Because there is a pronounced seasonal cycle of water availability and likely demand for water in the Horizons Region, it makes sense to sample the part of the year that is expected to be drier. Figure 5 below shows the average and quartile spread of normalised seasonal behaviour from sites in the Horizons region. While it is clear that the months of January to April are well below the long-term mean flow, there is some ambiguity about November, December and May. Discussion with Horizons regarding irrigation seasons and consideration of low flow periods led to selection of November to April inclusive as the dry season. The inclusion of November is more consistent in this case with the overall goal of statistics used for water allocation and water quality (Roygard, pers. comm.).
Seasonal Flow Pattern in Horizons Region 180%
160%
140%
120%
100%
80%
60%
40% 25%ile average 20% 75%ile
0% JulAugSepOctNovDecJanFebMarAprMayJun
Figure 5: Monthly mean flow as a percentage of the long-term mean flow for all sites in the Horizons region unaffected by diversions (including simulated natural records).
2.5. Temporal sampling
Flow statistics as discussed above can be calculated for different time periods from a hydrological record. Often the complete record is used, as this provides the best estimate of each statistic when the flow series is stationary (i.e. its statistics do not vary with time). However where there is significant variability either seasonally or at decadal scales it can be useful to sample within the full record, either by filtering data to select certain seasons, or by defining different time periods. An example of decadal variability is that related in the South Island to the Inter-decadal Pacific Oscillation
Statistical analysis of river flow data in the Horizons Region 10
(IPO). There flows recorded in major rivers experienced a step change in statistical properties at 1978. The years 1945 to 1977 on the Clutha River for example were 14% drier than the years 1978 to 19994. There is some evidence of opposite effects in the eastern Manawatu catchment and the east coast part of the Horizons Region (Woods, pers. comm.).
Another significant effect on flow statistics is changes in river management due to changes in the consent rules for major abstractions. These can be coincident with climate effects and it can be difficult to separate the two. For example, changes in the consent rules have changed the minimum flows downstream of the Tongariro Power Development (TPD) over time. These affect the flow statistics of the rivers below diversions. A chronology follows.
We are not aware of any other significant temporal influences, either natural or artificial, in the Horizons Region, that would affect the calculation of flow statistics.
2.5.1. Western diversion
Operation of these structures affects flows in the Whanganui and Whakapapa Rivers and tributaries.
28 November 1972: Western Diversion begins. Small release flows (600 L/s) at Whakapapa for fish, and a temperature based minimum flow rule (7.1 m3/s) at Piriaka.
25 December 1983: implementation of minimum flow rule at Te Maire (22 m3/s from 1st December to 15th February, and Easter weekend; 16 m3/s otherwise).
1 September 1992: Planning Tribunal rules on Whanganui (a 3 m3/s minimum flow at Whakapapa, 29 m3/s at Te Maire from 1st December to 31 May, otherwise no minimum).
20 April 1993: Otamangakau sluice valve used to provide minimum flows at Te Maire, in preference to Whakapapa releases.
1 December 2004: Additional minimum flows at Mangatepopo Intake (0.5 m3/s) and the Whanganui Intake (0.3 m3/s) as a result of the resource consent hearings.
4 McKerchar, A. I. and R. D. Henderson (2003). Shifts in flood and low-flow regimes in New Zealand due to interdecadal climate variations. Hydrological Sciences Journal 48(4): 637- 654.
Statistical analysis of river flow data in the Horizons Region 11
2.5.2. Eastern diversion
Operation of these structures affects flows in the Whangaehu, Moawhango and Rangitikei Rivers and tributaries.
April 1979: Moawhango Dam operational. No minimum flow below the dam.
July 1979: Mangaio Tunnel operational.
1 December 2004: flushing flows and an increased minimum flow (0.6 m3/s) down the Moawhango River below the dam as a result of the resource consent hearings.
2.5.3. TPD as a whole
1 December 2004: Current consents become operative.
To analyse the effects of these flow regime changes the affected records have been analysed as shorter series between significant date changes.
As a consequence of these alterations over time in TPD consents and management, a number of different time periods have been assessed at affected sites. These are:
Pre-diversion: up to June 1972 on the Whanganui, June 1978 on the Moawhango, Rangitikei and Whangaehu;
1972 rules: July 1973 to June 1983 on the Whanganui;
1983 rules: July 1983 to July 1992 on the Whanganui;
Post-diversion: July 1979 to present on the Moawhango, Rangitikei and Whangaehu;
Planning Tribunal 1990: July 1992 to June 2004 on the Whanganui.
All data: the full record. This is applied to all other sites and to the TPD records for completeness. However only limited use can be gained from the full record analysis of affected sites.
Statistical analysis of river flow data in the Horizons Region 12
There was insufficient data since the inception of the current consents for a special data period to be used from then. This will become viable in five or ten years.
Because of these varying effects, the most reliable comparisons on sites affected by the TPD is to compare the simulated natural record (all data) with the simulated current consent (all data). Recorded data should only be used with caution over periods of consistent management rules and consent conditions.
2.6. Synthetic time series
2.6.1. Temporal changes
When changes in regime over time significantly affect a river record, temporal sampling can be used to separate effects. However when there are changes in climate regime over the same time periods, this leads to mixed effects that can be difficult to separate. One way to deal with this difficulty is to synthesise flow records over the full time range. This is done by using records of diverted and in-river flows, and recombining them into a natural flow series. This natural flow series can then be used to model different operational regimes using the full date range thus covering a wider range of climate influences. By comparing the natural flow series with the modelled operational regimes, the true impact of the operational regime can be seen, separate from the climatic influences.
Numerous exercises of this type have been done on the rivers downstream of the TPD, and the results of natural flow simulation and a model of the present consents on the Whanganui River have been used here to illustrate the importance of this approach.
Other rivers affected by diversion or significant abstractions are:
Turitea Stream near Palmerston North: used for water supply with a take of up to 37,000 m3/day (average 430 L/s), and a minimum flow downstream of the dam of 25 L/s. This influences the Turitea at Ngahere Park record and the modelled flow at Manawatu at Opiki Bridge;
Mangahao River in the Tararuas: diverted for hydro power generation into the Mangaore Stream which flows into the lower Manawatu near Shannon. This impacts flows in the Manawatu at sites such as Mangahao at Ballance, Manawatu at Upper Gorge, Manawatu at Teachers College and Opiki Bridge;
Statistical analysis of river flow data in the Horizons Region 13
Makotuku and Makara, tributaries of the Whangaehu: these have water diverted by the Raetihi power scheme to the Orautoha power station and thence into the Orautoha, a tributary of the Manganui-o-te-ao, a tributary of the Whanganui. The take is up to 300 L/s based on the current consent, and affects the flow records Mangawhero at Ore Ore, Whangaehu at Kauangaroa, Manganui-o-te-ao at Ashworth, and Whanganui at Paetawa; and
Turakina River flows are affected by a power scheme.
Flow records affected by these known diversions have not been naturalised, partly because they have minor impacts and partly because there are insufficient data to allow a consistent treatment.
There are other influences on flow data in the region (e.g. the Dannevirke Water Supply take of up to 100 L/s affects the Tamaki at Water Supply Weir). Increasing irrigation abstraction and other demand for water over time will also have an influence. These can only be properly assessed if accurate water use records are kept, so that flow series can be naturalised.
2.6.2. Other synthetic records
Horizons staff have synthesised long flow records at three sites as follows:
Kiwitea at Spur Road All: this dataset is a combination of Kiwitea at Spur Rd Extension (1032516) that was lost in the October 1998 flood, its replacement at the Cheltenham Gun Club (1032578) that was lost in the February 2004 flood, and its replacement currently operating at Haynes Line (1132517). Relationships between flows at the various sites were used to establish the merged record.
Manawatu at Palmerston North: the record is a combination of Manawatu at Fitzherbert (32502) from 1923 to 1971, Manawatu at Ruahine Street (32580) from 1971 to 1987, and Manawatu at Teachers College (1032560) from 1987 onwards. The Fitzherbert and Teachers College sites are within metres of each other, with the Fitzherbert site just downstream but above the bridge. The Ruahine Street site, approximately four kilometres upstream was closed due to extensive disturbance of the control during river control works. The three sites can be regarded as a homogeneous series and have therefore merely been combined into one dataset.
Statistical analysis of river flow data in the Horizons Region 14
Mangatainoka at Pahiatua All: the record is a combination of Mangatainoka at Suspension Bridge (32531) and Mangatainoka at Pahiatua Town Bridge (1132513) approximately four kilometres upstream, which replaced the historic Suspension Bridge site in October 2004. The river is occasionally partially dammed during river works and by Tararua District Council when gravel movement in the channel affects their gallery intakes limiting water supplies to Pahiatua. Where these events reduce river flows to the extent that analysis of annual low flows is affected they have been removed from the record. Other instances remain.
Mangatera at Dannevirke (1 & 2): these flows are synthesised using linear regression relations derived from simultaneous gaugings at Manawatu at Weber Road. The second series has the regression forced through zero.
Oroua at Kawa Wool All: this record is a combination of the site operated at Kawa Wool (32563) adjacent to Feilding Golf Course and routed flows from upstream sites. Data since July 1992 has been modelled using routed addition of flows from the upstream Kiwitea and Almadale sites. Kiwitea input is from Spur Rd Extension and therefore is also modelled for part of the record, although slightly differently to the model used for Kiwitea Spur Rd All dataset used for flow statistics in this project. An important feature of this record is that the February 2004 flood is a modelled value since the Oroua recorder failed during the event.
Oroua at Almadale All: the record is combination of historic site (32514), also known as Oroua at Forlongs Road, operated by Manawatu Catchment Board and Oroua at Almadale Slackline (1132508). Oroua at Almadale closed Jan 1979 but was re-opened by HRC in July 1992 following loss of the Kawa Wool site. Site moved slightly downstream in Nov 2002 to the slackline gauging section. Flows affected by water abstraction upstream at Barrows Road for Feilding supply (~100 L/s). Most irrigation abstraction occurs between Almadale and the Kawa Wool station at Feilding.
Tokomaru All: this record is a combination of the Tokomaru at Quarry (1032517) and Tokomaru at Darkys Hole (approximately 500 metres downstream). Darkys Hole installation was washed away in Jan 2005 flood and the cross-section was damaged. The site was re-established a further kilometre downstream at Highway Bridge (32511). Site closed again Jan 2006. The river is affected by Mangahao Power Scheme. The headwaters are dammed by the Arapeti dam which collects water from the upper Tokomaru catchment and the Tararua Range tunnel from the Mangahao dams and diverts
Statistical analysis of river flow data in the Horizons Region 15
it to the Power House at Shannon, which discharges to the Mangaore Stream. The Arapeti dam has no minimum release flow and there are no records that it has ever spilled.
Manawatu at Opiki 37 Mile: this is a modelled site, located just above upstream extent of tidal influence and upstream of Oroua confluence and Moutoa Sluice Gates. The flow series to Opiki has been modelled using routed addition of flows from upstream Manawatu at Teachers College, Mangaone at Milson Line, Turitea at Ngahere Park and Kahuterawa at Johnstons Rata sites. The Turitea and Kahuterawa records are short and these have been extended using correlations with the combined Tokomaru record. The Mangaone rating curves required significant review and amendment.
Hautapu Taihape All. This dataset is a combination of Hautapu at Taihape (32726), now closed, and Hautapu at Alabasters (32767), slightly upstream of the Taihape site. Adjustments to the high flows have been done to create the merged flow series.
Mangawhero at Ohakune All. The record is combination of a Rangitikei Wanganui Catchment Board site at the western end of Burns Street, Ohakune (33118) and the current site at Hagleys (33143) several hundred metres upstream near the southern edge of the sewage ponds.
3. Acknowledgements
Data for this report were provided from the archives of Horizons Regional Council and the water Resources Archive (NIWA). Many of the sites from the NIWA archive were funded by Genesis Energy and its predecessors, as was analysis of flows below the TPD scheme, and simulation of natural flows and current consent conditions. We thank Genesis for their permission to use the data and analyses.
This project was funded largely by the Foundation for Research Science and Technology under the Envirolink programme.
4. Flow summaries
For each time series supplied by Horizons, and for a number of synthetic flow series, flow statistics are presented in a variety of ways. Flow summaries are sorted in the following order:
Statistical analysis of river flow data in the Horizons Region 16
by major catchment5,
alphabetically by flow site name,
data type recorded data, simulated natural flows, or simulated flows for the present consent conditions;
date range different periods downstream of the TPD diversions during which operational constraints or consent conditions have been consistent.
A flow summary table gives the statistics considered of prime importance, for both the complete record (truncated to the nearest water year boundary, and for the dry season as defined above. For each flow site, and for each time period where there are significant changes to the flow regime as described in section 2.5, there is a two page spread. The first page identifies the site and time period, and presents flow magnitude and flow variability statistics as follows:
Flow Statistics:
± Mean, the long term average of the flow record;
± MALF, the mean annual low flow from one day moving average flows;
± ½ median (all year and dry season), half the median flow for the season;
± 3x median (all year and dry season), three times the median flow used as an index of ecological disturbance;
± MAF;
Flow Variability: for all year and summer only, a selection of flow values at specified percentiles on the flow duration curve:
5 Catchments of New Zealand, Soil Conservation and Rivers Control Council, December 1956.
Statistical analysis of river flow data in the Horizons Region 17
± 0 (maximum recorded), 10, 20, 25 (upper quartile), 30, 40, 50 (median), 60, 70, 75 (lower quartile), 80, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 and 100 (minimum recorded);
Biological disturbance indicators:
± MAF/MALF ratio;
± MAF/median ratio;
± FRE3 (all year and dry season), the number of floods per year or season greater than three times the relevant median flow;
± STD Annual FRE3, the standard deviation of the annual series of FRE3 values;
± Mean days of accrual, the average of the periods between the floods that exceed 3x median flow;
± STD Accrual, the standard deviation of the number of days between the floods that exceed 3x median flow;
± MIN Accrual, the shortest interflood period;
± MAX Accrual, the longest interflood period.
Then a graph shows the seasonal flow regime using the maximum and minimum, upper and lower quartiles and mean and median of the monthly mean flows.
Where statistics could not be calculated because of data continuity or quality issues, a symbol NaN meaning not a number is used to indicate this. Subsequent statistics that use the invalid value are also indicated with a NaN.
In an Appendix, more complete tables are presented. These show the complete FDC for both the full record and dry season, the series of annual maxima used to define the mean annual flood, the series of annual minima used to define the MALF, and a table showing the number of days per month that the river flow has historically been below the MALF. At present the MALF is used as threshold for all records. Alternative statistics such as the catchment minimum flow under a water plan could readily be substituted.
Statistical analysis of river flow data in the Horizons Region 18
Location maps have been provided by Horizons to show the locations of flow recorders. These are presented below as Figures 6 to 10 which are presented prior to the flow statistics for each of the major catchments.
Statistical analysis of river flow data in the Horizons Region 19
4.1. East Coast Catchments
The list below shows: section number in this report, site name, (site number) and full date range. The analysis date range is from the first July after the start date until the last June before the finish date.
3.1.1. Akitio at Weber (25003), Jul-1980 to Jul-2000 (all data)
3.1.2. Owahanga at Branscombe Br (1425101), Jul-1999 to Jul-2005 (all data)
Statistical analysis of river flow data in the Horizons Region 20
Figure 6: Flow sites in the upper Manawatu and East Coast areas of the Region.
Statistical analysis of river flow data in the Horizons Region 21
4.1.1. Akitio at Weber (25003), Jul-1980 to Jul-2000 (all data)
Site Akitio at Weber
Time series Data Start Time 2-Nov-79 details Data End Time 1-May-01 Analysis Start time 1-Jul-80 Analysis End time 1-Jul-00 Years of record analysed20 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 2.223 MALF 0.047 ½ median 0.3130.13 3x median 1.8780.78 MAF 194.75 Flow 0 (maximum recorded flow) 445.248 445.248 variability 10 4.0541.579 percentiles 20 2.1130.839 25 (upper quartile flow) 1.6660.668 30 1.3580.555 40 0.9190.393 50 (median flow) 0.6260.26 60 0.4350.172 70 0.2860.112 75 (lower quartile flow) 0.2170.089 80 0.1540.069 90 0.0680.04 91 0.0610.038 92 0.0560.036 93 0.0510.033 94 0.0460.03 95 0.0410.027 96 0.0360.024 97 0.030.021 98 0.0210.018 99 0.0110.011 100 (minimum recorded flow) 0.0020.002
Statistical analysis of river flow data in the Horizons Region 22
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 4143.617 disturbance MAF/median 311.102 indicators FRE3 (floods/year or season) 9.710.576 STD Annual FRE3 2.9754.12 Mean Days of Accrual (days) 27.68924.297 STD Accrual (days) 33.9229.876 Min Accrual (days) 55 Max Accrual (days) 235170
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 23
4.1.2. Owahanga at Branscombe Br (1425101), Jul-1999 to Jul-2005 (all data)
Site Owahanga at Branscombe Br
Time series Data Start Time 22-Jun-99 details Data End Time 18-Nov-05 Analysis Start time 1-Jul-99 Analysis End time 1-Jul-05 Years of record analysed6 Gaps in the data (% of record). 1.85
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 5.5 MALF 0.039 ½ median 0.7460.28 3x median 4.4761.677 MAF 300.29 Flow 0 (maximum recorded flow) 664.541 664.541 variability 10 9.9543.728 percentiles 20 5.1561.861 25 (upper quartile flow) 4.0981.458 30 3.2911.184 40 2.2120.827 50 (median flow) 1.4920.559 60 0.9640.387 70 0.5830.245 75 (lower quartile flow) 0.4430.185 80 0.310.127 90 0.1250.055 91 0.110.05 92 0.0950.046 93 0.080.042 94 0.0650.038 95 0.0540.034 96 0.0430.03 97 0.0320.025 98 0.0220.016 99 0.0110.008 100 (minimum recorded flow) 00
Statistical analysis of river flow data in the Horizons Region 24
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 6673.111 disturbance MAF/median 201.267 indicators FRE3 (floods/year or season) 11.16511.073 STD Annual FRE3 1.1763.03 Mean Days of Accrual (days) 22.59421.568 STD Accrual (days) 25.22719.204 Min Accrual (days) 55 Max Accrual (days) 15476
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 25
4.2. Manawatu and Southern West Coast Catchments
The list below shows: section number in this report, site name, (site number) and full date range. The analysis date range is from the first July after the start date until the last June before the finish date.
3.2.1. Manakau at Gleesons Rd (32001), Jul-1979 to Jul-1989 (all data)
3.2.2. Ohau (Water Race) at d/s Culvert (32107), Jul-1991 to Jul-1994 (all data)
3.2.3. Ohau at Rongomatane (32106), Jul-1978 to Jul-2004 (all data)
3.2.4. Ohau at Water Race (32105), Jul-1974 to Jul-1978 (all data)
3.2.5. Kiwitea at Spur Rd All (200), Jul-1977 to Jul-2005 (all data)
3.2.6. Kumeti at SH2(Napier) (32599), Jul-1975 to Jul-1980 (all data)
3.2.7. Kumeti at Te Rehunga (1032501), Jul-1981 to Jul-2004 (all data)
3.2.8. Makakahi at Hamua (1032518), Jul-1980 to Jul-2005 (all data)
3.2.9. Makino at Boness Rd (1032564), Jul-1992 to Jul-2006 (all data)
3.2.10. Makuri at Tuscan Hills (1032591), Jul-2001 to Jul-2006 (all data)
3.2.11. Manawatu at Hopelands (32504), Jul-1948 to Jul-2005 (all data)
3.2.12. Manawatu at Opiki (synthetic) (1932501), Jul-1980 to Jul-2006 (all data)
3.2.13. Manawatu at Palmerston North All (300), Jul-2023 to Jul-2005 (all data)
3.2.14. Manawatu at Upper Gorge (1232566), Jul-1979 to Jul-2003 (all data)
3.2.15. Manawatu at Weber Rd (32503), Jul-1955 to Jul-2004 (all data)
3.2.16. Manga-Atua at Hopelands Rd (1232564), Jul-1980 to Jul-1989 (all data)
3.2.17. Mangahao at Ballance (32526), Jul-1962 to Jul-2004 (all data)
3.2.18. Mangatainoka at Larsons Br (1032555), Jul-1983 to Jul-2006 (all data)
3.2.19. Mangatainoka at Pahiatua All (400), Jul-1954 to Jul-2005 (all data)
3.2.20. Mangatera at Dannevirke 1 (synthetic) (32541), Jul-1955 to Jul-2004 (all data)
3.2.21. Mangatera at Dannevirke 2 (synthetic) (500), Jul-1955 to Jul-2004 (all data)
3.2.22. Oroua at Almadale All (800), Jul-1948 to Jul-2004 (all data)
3.2.23. Oroua at Awahuri Br (1932512), Jul-1992 to Jul-2004 (all data)
Statistical analysis of river flow data in the Horizons Region 26
3.2.24. Oroua at Kawa Wool (synthetic) (700), Jul-1967 to Jul-2004 (all data)
3.2.25. Pohangina at Mais Reach (32576), Jul-1969 to Jul-2005 (all data)
3.2.26. Tamaki at SH2(Napier) (1032503), Jul-1977 to Jul-1983 (all data)
3.2.27. Tamaki at Stephensons (1332556), Dec-2003 to Apr-2005 (all data)
3.2.28. Tamaki at Water Supply Weir (1032504), Jul-1983 to Jul-2004 (all data)
3.2.29. Tiraumea at Ngaturi (32529), Jul-1980 to Jul-2004 (all data)
3.2.30. Tokomaru All (900), Jul-1980 to Jul-2005 (all data)
3.2.31. Turitea at Ngahere Park Rd (1132501), Jul-2001 to Jul-2006 (all data)
3.2.32. Puke Puke at Lake Outlet (32602), Jul-1971 to Jul-1980 (all data)
Statistical analysis of river flow data in the Horizons Region 27
Figure 7: Flow sites in the lower Manawatu and southern West Coast catchments.
Statistical analysis of river flow data in the Horizons Region 28
Statistical analysis of river flow data in the Horizons Region 29
4.2.1. Manakau at Gleesons Rd (32001), Jul-1979 to Jul-1989 (all data)
Site Manakau atGleesons Rd
Time series Data Start Time 23-Nov-78 details Data End Time 21-Mar-90 Analysis Start time 1-Jul-79 Analysis End time 1-Jul-89 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 0.325 MALF 0.036 ½ median 0.0860.054 3x median 0.5130.321 MAF 19.061 Flow 0 (maximum recorded flow) 32.711 32.711 variability 10 0.6540.443 percentiles 20 0.3850.243 25 (upper quartile flow) 0.3210.202 30 0.2740.173 40 0.2140.139 50 (median flow) 0.1710.107 60 0.1410.084 70 0.1060.067 75 (lower quartile flow) 0.0890.059 80 0.0760.052 90 0.050.038 91 0.0470.036 92 0.0440.035 93 0.0420.033 94 0.040.031 95 0.0370.029 96 0.0340.028 97 0.0310.026 98 0.0270.022 99 0.0220.017 100 (minimum recorded flow) 0.0100.010
Statistical analysis of river flow data in the Horizons Region 30
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 529.472 disturbance MAF/median 111.468 indicators FRE3 (floods/year or season) 13.29812.49 STD Annual FRE3 2.4044.221 Mean Days of Accrual (days) 22.27821.731 STD Accrual (days) 23.78423.725 Min Accrual (days) 55 Max Accrual (days) 137126
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 31
4.2.2. Ohau (Water Race) at d/s Culvert (32107), Jul-1991 to Jul-1994 (all data)
Site Ohau (Water Race) at d/s Culvert
Time series Data Start Time 6-Mar-91 details Data End Time 6-Oct-94 Analysis Start time 1-Jul-91 Analysis End time 1-Jul-94 Years of record analysed3 Gaps in the data (% of record). 7.86
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 0.125 MALF 0.039 ½ median 0.0590.054 3x median 0.3540.324 MAF Flow 0 (maximum recorded flow) 0.442 0.424 variability 10 0.1890.181 percentiles 20 0.1620.154 25 (upper quartile flow) 0.1520.145 30 0.1460.137 40 0.1330.12 50 (median flow) 0.1180.108 60 0.1060.097 70 0.0950.085 75 (lower quartile flow) 0.090.08 80 0.0840.073 90 0.0680.06 91 0.0660.058 92 0.0640.057 93 0.0620.056 94 0.060.056 95 0.0580.055 96 0.0560.053 97 0.0540.052 98 0.0520.05 99 0.0490.046 100 (minimum recorded flow) 0.0170.017
Statistical analysis of river flow data in the Horizons Region 32
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF NaN NaN disturbance MAF/median NaNNaN indicators FRE3 (floods/year or season) NaNNaN STD Annual FRE3 NaNNaN Mean Days of Accrual (days) NaNNaN STD Accrual (days) NaNNaN Min Accrual (days) NaNNaN Max Accrual (days) NaNNaN
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 33
4.2.3. Ohau at Rongomatane (32106), Jul-1978 to Jul-2004 (all data)
Site Ohau at Rongomatane
Time series Data Start Time 14-Jul-78 details Data End Time 11-Apr-05 Analysis Start time 14-Jul-78 Analysis End time 1-Jul-04 Years of record analysed26 Gaps in the data (% of record). 0.19
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 6.399 MALF 1.042 ½ median 1.911.535 3x median 11.4579.207 MAF 222.75 Flow 0 (maximum recorded flow) 492.722 410.542 variability 10 12.17610.595 percentiles 20 7.7856.492 25 (upper quartile flow) 6.6755.517 30 5.8624.775 40 4.663.78 50 (median flow) 3.8193.069 60 3.1492.549 70 2.5882.116 75 (lower quartile flow) 2.3271.901 80 2.0681.696 90 1.5171.274 91 1.4571.232 92 1.3961.19 93 1.331.14 94 1.2581.081 95 1.1891.027 96 1.1110.978 97 1.0250.912 98 0.9280.815 99 0.7870.665 100 (minimum recorded flow) 0.5840.584
Statistical analysis of river flow data in the Horizons Region 34
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 210.738 disturbance MAF/median 58.327 indicators FRE3 (floods/year or season) 14.84514.955 STD Annual FRE3 2.0863.947 Mean Days of Accrual (days) 20.18718.846 STD Accrual (days) 18.26117.392 Min Accrual (days) 55 Max Accrual (days) 145125
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 35
4.2.4. Ohau at Water Race (32105), Jul-1974 to Jul-1978 (all data)
Site Ohau at Water Race
Time series Data Start Time 18-Jan-74 details Data End Time 15-Jul-78 Analysis Start time 1-Jul-74 Analysis End time 1-Jul-78 Years of record analysed4 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 5.988 MALF 0.802 ½ median 1.7151.116 3x median 10.2876.696 MAF 207.84 Flow 0 (maximum recorded flow) 333.913 333.913 variability 10 12.0277.78 percentiles 20 7.2874.539 25 (upper quartile flow) 6.0673.918 30 5.3323.513 40 4.2142.851 50 (median flow) 3.4292.232 60 2.8721.783 70 2.2611.5 75 (lower quartile flow) 1.9271.346 80 1.6921.225 90 1.2320.898 91 1.1890.868 92 1.120.844 93 1.0590.814 94 0.9820.787 95 0.9010.727 96 0.8460.678 97 0.7840.631 98 0.6660.588 99 0.590.554 100 (minimum recorded flow) 0.5040.504
Statistical analysis of river flow data in the Horizons Region 36
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 259.152 disturbance MAF/median 60.612 indicators FRE3 (floods/year or season) 14.49814.605 STD Annual FRE3 3.0932.988 Mean Days of Accrual (days) 20.87719.621 STD Accrual (days) 21.22215.511 Min Accrual (days) 55 Max Accrual (days) 12069
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 37
4.2.5. Kiwitea at Spur Rd All (200), Jul-1977 to Jul-2005 (all data)
Site Kiwitea at Spur Rd All
Time series Data Start Time 5-Nov-76 details Data End Time 2-Feb-06 Analysis Start time 1-Jul-77 Analysis End time 1-Jul-05 Years of record analysed28 Gaps in the data (% of record). 0.24
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 2.356 MALF 0.161 ½ median 0.520.243 3x median 3.121.455 MAF 75.15 Flow 0 (maximum recorded flow) 357.744 357.744 variability 10 5.412.13 percentiles 20 3.2451.248 25 (upper quartile flow) 2.6431.043 30 2.1330.871 40 1.4540.63 50 (median flow) 1.040.485 60 0.7390.378 70 0.5270.298 75 (lower quartile flow) 0.440.262 80 0.3610.23 90 0.2290.17 91 0.2170.164 92 0.2050.158 93 0.1930.151 94 0.1810.144 95 0.1690.137 96 0.1570.129 97 0.1430.12 98 0.1280.108 99 0.1050.09 100 (minimum recorded flow) 0.0380.038
Statistical analysis of river flow data in the Horizons Region 38
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 478.662 disturbance MAF/median 72.26 indicators FRE3 (floods/year or season) 8.6789.714 STD Annual FRE3 2.5063.547 Mean Days of Accrual (days) 31.85126.494 STD Accrual (days) 38.19225.607 Min Accrual (days) 55 Max Accrual (days) 229123
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 39
4.2.6. Kumeti at SH2(Napier) (32599), Jul-1975 to Jul-1980 (all data)
Site Kumeti at SH2(Napier)
Time series Data Start Time 26-Jun-75 details Data End Time 21-Aug-80 Analysis Start time 1-Jul-75 Analysis End time 1-Jul-80 Years of record analysed5 Gaps in the data (% of record). 4.33
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 0.719 MALF 0.042 ½ median 0.1850.114 3x median 1.110.681 MAF Flow 0 (maximum recorded flow) 47.281 45.456 variability 10 1.270.668 percentiles 20 0.8570.443 25 (upper quartile flow) 0.7520.382 30 0.660.339 40 0.4930.272 50 (median flow) 0.370.227 60 0.2940.186 70 0.2340.149 75 (lower quartile flow) 0.2060.13 80 0.1780.111 90 0.1120.064 91 0.1040.058 92 0.0940.053 93 0.0850.049 94 0.0760.045 95 0.0650.041 96 0.0540.037 97 0.0450.033 98 0.0370.029 99 0.0290.023 100 (minimum recorded flow) 0.0120.012
Statistical analysis of river flow data in the Horizons Region 40
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 0 disturbance MAF/median 0 indicators FRE3 (floods/year or season) 11.2435.524 STD Annual FRE3 1.9024.447 Mean Days of Accrual (days) 33.62947.769 STD Accrual (days) 42.98848.415 Min Accrual (days) 55 Max Accrual (days) 187170
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 41
4.2.7. Kumeti at Te Rehunga (1032501), Jul-1981 to Jul-2004 (all data)
Site Kumeti at Te Rehunga
Time series Data Start Time 20-Aug-80 details Data End Time 21-Apr-05 Analysis Start time 1-Jul-81 Analysis End time 1-Jul-04 Years of record analysed23 Gaps inthe data (% of record). 0.34
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 0.354 MALF 0.061 ½ median 0.1380.097 3x median 0.8280.579 MAF 8.283 Flow 0 (maximum recorded flow) 22.177 22.177 variability 10 0.5950.421 percentiles 20 0.4410.328 25 (upper quartile flow) 0.4040.301 30 0.3680.273 40 0.3190.227 50 (median flow) 0.2760.193 60 0.230.156 70 0.1860.122 75 (lower quartile flow) 0.1590.109 80 0.1330.095 90 0.0880.064 91 0.0840.06 92 0.0790.056 93 0.0730.052 94 0.0670.048 95 0.0610.043 96 0.0540.04 97 0.0460.037 98 0.0390.033 99 0.0320.029 100 (minimum recorded flow) 0.0120.012
Statistical analysis of river flow data in the Horizons Region 42
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 135.787 disturbance MAF/median 30.011 indicators FRE3 (floods/year or season) 5.3913.854 STD Annual FRE3 2.6762.971 Mean Days of Accrual (days) 58.09848.4 STD Accrual (days) 66.21245.065 Min Accrual (days) 55 Max Accrual (days) 331180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 43
4.2.8. Makakahi at Hamua (1032518), Jul-1980 to Jul-2005 (all data)
Site Makakahi at Hamua
Time series Data Start Time 19-Dec-79 details Data End Time 6-Sep-05 Analysis Start time 1-Jul-80 Analysis End time 1-Jul-05 Years of record analysed25 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 6.406 MALF 0.345 ½ median 1.590.827 3x median 9.544.959 MAF 192.84 Flow 0 (maximum recorded flow) 483.054 298.839 variability 10 13.9438.297 percentiles 20 8.2934.65 25 (upper quartile flow) 6.863.738 30 5.823.096 40 4.272.217 50 (median flow) 3.181.653 60 2.3241.238 70 1.6590.939 75 (lower quartile flow) 1.3670.801 80 1.1130.664 90 0.6370.4 91 0.5870.376 92 0.540.352 93 0.4880.33 94 0.4370.309 95 0.3890.289 96 0.3450.266 97 0.3060.236 98 0.2640.195 99 0.1950.16 100 (minimum recorded flow) 0.0910.091
Statistical analysis of river flow data in the Horizons Region 44
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 558.957 disturbance MAF/median 60.642 indicators FRE3 (floods/year or season) 13.2412.011 STD Annual FRE3 2.5355.445 Mean Days of Accrual (days) 21.22720.982 STD Accrual (days) 23.8122.175 Min Accrual (days) 55 Max Accrual (days) 162124
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 45
4.2.9. Makino at Boness Rd (1032564), Jul-1992 to Jul-2006 (all data)
Site Makino at Boness Rd
Time series Data Start Time 19-Dec-91 details Data End Time 10-Jul-06 Analysis Start time 1-Jul-92 Analysis End time 1-Jul-06 Years of record analysed14 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 0.938 MALF 0.083 ½ median 0.1220.082 3x median 0.7320.489 MAF 38.928 Flow 0 (maximum recorded flow) 90.788 90.788 variability 10 2.0020.594 percentiles 20 0.9110.307 25 (upper quartile flow) 0.690.258 30 0.5340.227 40 0.3330.191 50 (median flow) 0.2440.163 60 0.1970.142 70 0.1660.123 75 (lower quartile flow) 0.1510.114 80 0.1360.105 90 0.1040.085 91 0.10.083 92 0.0960.081 93 0.0930.079 94 0.0890.077 95 0.0860.075 96 0.0820.072 97 0.0780.069 98 0.0730.062 99 0.0610.048 100 (minimum recorded flow) 0.0280.028
Statistical analysis of river flow data in the Horizons Region 46
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 469.012 disturbance MAF/median 159.541 indicators FRE3 (floods/year or season) 8.510.506 STD Annual FRE3 1.5024.036 Mean Days of Accrual (days) 30.85726.12 STD Accrual (days) 32.93125.006 Min Accrual (days) 55 Max Accrual (days) 164142
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 47
4.2.10. Makuri at Tuscan Hills (1032591), Jul-2001 to Jul-2006 (all data)
Site Makuri at Tuscan Hills
Time series Data Start Time 7-Oct-00 details Data End Time 10-Jul-06 Analysis Start time 1-Jul-01 Analysis End time 1-Jul-06 Years of record analysed5 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 5.464 MALF 2.156 ½ median 1.9221.6 3x median 11.5299.6 MAF 140.02 Flow 0 (maximum recorded flow) 278.547 278.547 variability 10 8.976.612 percentiles 20 6.1464.712 25 (upper quartile flow) 5.484.314 30 5.0283.983 40 4.383.539 50 (median flow) 3.8433.2 60 3.4342.928 70 3.0492.653 75 (lower quartile flow) 2.8592.556 80 2.6652.428 90 2.3112.207 91 2.2742.192 92 2.2412.176 93 2.2142.159 94 2.1892.137 95 2.1582.112 96 2.1252.088 97 2.092.063 98 2.0542.035 99 2.0052.003 100 (minimum recorded flow) 1.9081.927
Statistical analysis of river flow data in the Horizons Region 48
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 64.944 disturbance MAF/median 36.435 indicators FRE3 (floods/year or season) 10.8018.868 STD Annual FRE3 1.6382.701 Mean Days of Accrual (days) 31.03833.44 STD Accrual (days) 31.2430.837 Min Accrual (days) 66 Max Accrual (days) 169132
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 49
4.2.11. Manawatu at Hopelands (32504), Jul-1948 to Jul-2005 (all data)
Site Manawatu at Hopelands
Time series Data Start Time 12-Dec-47 details Data End Time 16-Oct-05 Analysis Start time 1-Jul-48 Analysis End time 1-Jul-05 Years of record analysed57 Gaps in the data (% of record). 58.15
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 26.655 MALF (1989 to 2005) 3.734 ½ median 7.8525.014 3x median 47.10930.084 MAF 681.28 Flow 0 (maximum recorded flow) 1669.6 1669.6 variability 10 53.18532.7 percentiles 20 33.88120.476 25 (upper quartile flow) 28.87717.671 30 24.59215.7 40 19.46112.711 50 (median flow) 15.70310.028 60 12.8098.587 70 9.8467.135 75 (lower quartile flow) 8.9676.234 80 7.5635.431 90 5.2784.007 91 5.2073.818 92 4.9093.62 93 4.5833.507 94 4.2293.456 95 3.9093.36 96 3.5313.126 97 3.4292.822 98 3.0842.453 99 2.3892.182 100 (minimum recorded flow) 0.6370.637
Statistical analysis of river flow data in the Horizons Region 50
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 182.453 disturbance MAF/median 43.385 indicators FRE3 (floods/year or season) 8.7838.064 STD Annual FRE3 2.5584.98 Mean Days of Accrual (days) 35.65234.557 STD Accrual (days) 41.57633.615 Min Accrual (days) 55 Max Accrual (days) 253184
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 51
4.2.12. Manawatu at Opiki (synthetic) (1932501), Jul-1980 to Jul-2006 (all data)
Site Manawatu at Opiki (synthetic)
Time series Data Start Time 13-Dec-79 details Data End Time 16-Sep-06 Analysis Start time 1-Jul-80 Analysis End time 1-Jul-06 Years of record analysed26 Gaps in the data (% of record). 0.11
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 107.558 MALF 15.9 ½ median 33.56921.399 3x median 201.414128.391 MAF 1508.4 Flow 0 (maximum recorded flow) 3656.873 3656.873 variability 10 223.02140.584 percentiles 20 145.48388.443 25 (upper quartile flow) 124.59575.543 30 108.77465.646 40 85.05952.364 50 (median flow) 67.13842.797 60 53.62835.201 70 42.67328.855 75 (lower quartile flow) 37.46326.394 80 32.48223.799 90 23.15218.737 91 22.30118.264 92 21.41317.764 93 20.46617.22 94 19.50116.663 95 18.62116.144 96 17.65815.549 97 16.57714.868 98 15.52414.158 99 14.18213.234 100 (minimum recorded flow) 10.36210.362
Statistical analysis of river flow data in the Horizons Region 52
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 95.438 disturbance MAF/median 22.467 indicators FRE3 (floods/year or season) 10.96210.619 STD Annual FRE3 2.4873.762 Mean Days of Accrual (days) 27.98225.168 STD Accrual (days) 33.91424.369 Min Accrual (days) 55 Max Accrual (days) 198143
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 53
4.2.13. Manawatu at Palmerston North All (300), Jul-1923 to Jul-2005 (all data)
Site Manawatu at Palmerston North All
Time series Data Start Time 1-Jun-23 details Data End Time 15-Oct-05 Analysis Start time 1-Jul-23 Analysis End time 1-Jul-05 Years of record analysed82 Gaps in the data (% of record). 0.51
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 116.604 MALF 15.735 ½ median 36.70221.749 3x median 220.212130.491 MAF 1518.9 Flow 0 (maximum recorded flow) 3504.7 3504.7 variability 10 248.017159.336 percentiles 20 164.28199.343 25 (upper quartile flow) 140.39783.042 30 121.94371.449 40 94.26654.707 50 (median flow) 73.40443.497 60 56.92635.098 70 44.05128.177 75 (lower quartile flow) 38.15625.145 80 32.61622.358 90 22.00817.235 91 21.02816.727 92 20.06516.194 93 19.10115.656 94 18.14515.074 95 17.16914.476 96 16.14913.893 97 15.06713.22 98 13.90412.36 99 12.37511.372 100 (minimum recorded flow) 8.3958.395
Statistical analysis of river flow data in the Horizons Region 54
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 97.798 disturbance MAF/median 20.692 indicators FRE3 (floods/year or season) 10.81410.102 STD Annual FRE3 2.4064.412 Mean Days of Accrual (days) 28.24226.959 STD Accrual (days) 33.15925.821 Min Accrual (days) 55 Max Accrual (days) 250143
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 55
4.2.14. Manawatu at Upper Gorge (1232566), Jul-1979 to Jul-2003 (all data)
Site Manawatu at Upper Gorge
Time series Data Start Time 16-Jul-79 details Data End Time 13-Mar-04 Analysis Start time 16-Jul-79 Analysis End time 1-Jul-03 Years of record analysed24 Gaps in the data (% of record). 0.43
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 83.816 MALF 11.703 ½ median 25.18515.441 3x median 151.1192.643 MAF 1237.2 Flow 0 (maximum recorded flow) 2469.3 1957 variability 10 179.818109.717 percentiles 20 115.04565.515 25 (upper quartile flow) 97.29155.437 30 83.9348.241 40 64.56538.232 50 (median flow) 50.3730.881 60 40.11725.33 70 31.36820.499 75 (lower quartile flow) 27.3618.436 80 23.31516.448 90 15.97112.916 91 15.27112.555 92 14.61712.171 93 13.99911.753 94 13.39711.282 95 12.77710.867 96 12.07110.449 97 11.210.018 98 10.4169.654 99 9.6439.126 100 (minimum recorded flow) 7.3187.318
Statistical analysis of river flow data in the Horizons Region 56
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 106.462 disturbance MAF/median 24.562 indicators FRE3 (floods/year or season) 11.29111.923 STD Annual FRE3 2.7074.481 Mean Days of Accrual (days) 26.40122.306 STD Accrual (days) 32.90621.683 Min Accrual (days) 55 Max Accrual (days) 198143
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 57
4.2.15. Manawatu at Weber Rd (32503), Jul-1955 to Jul-2004 (all data)
Site Manawatu at Weber Rd
Time series Data Start Time 3-Jan-55 details Data End Time 14-Apr-05 Analysis Start time 1-Jul-55 Analysis End time 1-Jul-04 Years of record analysed49 Gaps in the data (% of record). None
Season1 July to 30 June1Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 15.563 MALF 1.879 ½ median 3.8032.115 3x median 22.81512.687 MAF 513.41 Flow 0 (maximum recorded flow) 1417.1 1417.1 variability 10 30.5216.253 percentiles 20 19.1869.823 25 (upper quartile flow) 15.8888.213 30 13.4896.991 40 10.1015.356 50 (median flow) 7.6054.229 60 5.7773.448 70 4.3542.837 75 (lower quartile flow) 3.7782.584 80 3.2082.338 90 2.321.875 91 2.2311.831 92 2.1441.785 93 2.0531.736 94 1.9631.685 95 1.8791.634 96 1.7861.582 97 1.6871.519 98 1.5781.446 99 1.4471.346 100 (minimum recorded flow) 1.0511.051
Statistical analysis of river flow data in the Horizons Region 58
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 273.236 disturbance MAF/median 67.51 indicators FRE3 (floods/year or season) 8.9998.881 STD Annual FRE3 2.5243.744 Mean Days of Accrual (days) 32.73628.972 STD Accrual (days) 39.32430.012 Min Accrual (days) 55 Max Accrual (days) 262184
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 59
4.2.16. Manga-Atua at Hopelands Rd (1232564), Jul-1980 to Jul-1989 (all data)
Site Manga-Atua at Hopelands Rd
Time series Data Start Time 28-Feb-80 details Data End Time 23-Jan-90 Analysis Start time 1-Jul-80 Analysis End time 1-Jul-89 Years of record analysed9 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 1.369 MALF 0.075 ½ median 0.3510.195 3x median 2.1061.17 MAF 68.176 Flow 0 (maximum recorded flow) 131.266 44.537 variability 10 2.7981.457 percentiles 20 1.6230.962 25 (upper quartile flow) 1.3450.789 30 1.1450.668 40 0.8960.512 50 (median flow) 0.7020.39 60 0.5350.311 70 0.3980.244 75 (lower quartile flow) 0.3420.215 80 0.2870.19 90 0.1870.14 91 0.1770.135 92 0.1660.13 93 0.1560.125 94 0.1460.119 95 0.1370.113 96 0.1290.104 97 0.1190.094 98 0.1020.086 99 0.0850.074 100 (minimum recorded flow) 0.0420.042
Statistical analysis of river flow data in the Horizons Region 60
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 909.013 disturbance MAF/median 97.117 indicators FRE3 (floods/year or season) 12.44613.437 STD Annual FRE3 2.6572.844 Mean Days of Accrual (days) 23.97320.569 STD Accrual (days) 25.12218.716 Min Accrual (days) 55 Max Accrual (days) 16693
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 61
4.2.17. Mangahao at Ballance (32526), Jul-1962 to Jul-2004 (all data)
Site Mangahao at Ballance
Time series Data Start Time 1-Jan-62 details Data End Time 14-Jan-05 Analysis Start time 1-Jul-62 Analysis End time 1-Jul-04 Years of record analysed42 Gaps in the data (% of record). 2.3
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 15.24 MALF 1.649 ½ median 3.6832.576 3x median 22.09815.453 MAF 539.04 Flow 0 (maximum recorded flow) 815.374 815.374 variability 10 29.57422.192 percentiles 20 16.92712.052 25 (upper quartile flow) 14.0969.954 30 12.0728.504 40 9.36.519 50 (median flow) 7.3665.151 60 5.844.221 70 4.5813.46 75 (lower quartile flow) 4.063.116 80 3.5682.777 90 2.6032.067 91 2.5011.974 92 2.3931.88 93 2.2771.782 94 2.1551.663 95 2.0031.522 96 1.8311.35 97 1.6191.22 98 1.3351.113 99 1.1130.968 100 (minimum recorded flow) 0.5410.541
Statistical analysis of river flow data in the Horizons Region 62
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 321.623 disturbance MAF/median 73.179 indicators FRE3 (floods/year or season) 15.02314.546 STD Annual FRE3 2.7414.47 Mean Days of Accrual (days) 18.95317.947 STD Accrual (days) 17.21715.735 Min Accrual (days) 55 Max Accrual (days) 148147
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 63
4.2.18. Mangatainoka at Larsons Br (1032555), Jul-1983 to Jul-2006 (all data)
Site Mangatainoka at Larsons Br
Time series Data Start Time 20-Jul-83 details Data End Time 10-Jul-06 Analysis Start time 20-Jul-83 Analysis End time 1-Jul-06 Years of record analysed23 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 5.17 MALF 0.395 ½ median 1.0650.743 3x median 6.394.458 MAF 194.48 Flow 0 (maximum recorded flow) 273.571 273.571 variability 10 10.5247.494 percentiles 20 5.6513.931 25 (upper quartile flow) 4.5823.166 30 3.8182.651 40 2.8071.945 50 (median flow) 2.131.486 60 1.6331.177 70 1.2640.942 75 (lower quartile flow) 1.1090.835 80 0.9630.737 90 0.680.529 91 0.6490.507 92 0.6130.484 93 0.5780.462 94 0.5410.441 95 0.5040.419 96 0.4670.397 97 0.430.372 98 0.3890.339 99 0.3350.284 100 (minimum recorded flow) 0.2110.211
Statistical analysis of river flow data in the Horizons Region 64
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 493.604 disturbance MAF/median 91.305 indicators FRE3 (floods/year or season) 17.43417.523 STD Annual FRE3 2.3484.996 Mean Days of Accrual (days) 14.87314.453 STD Accrual (days) 12.53611.34 Min Accrual (days) 55 Max Accrual (days) 11690
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 65
4.2.19. Mangatainoka at Pahiatua All (400), Jul-1954 to Jul-2005 (all data)
Site Mangatainoka at Pahiatua All
Time series Data Start Time 1-Jan-54 details Data End Time 25-Jul-05 Analysis Start time 1-Jul-54 Analysis End time 1-Jul-05 Years of record analysed51 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 17.68 MALF 1.578 ½ median 4.452.573 3x median 26.715.435 MAF 403.71 Flow 0 (maximum recorded flow) 885.771 601.799 variability 10 38.6723.576 percentiles 20 23.33712.968 25 (upper quartile flow) 19.1810.471 30 16.1158.824 40 11.7356.6 50 (median flow) 8.95.145 60 6.8334.104 70 5.1583.245 75 (lower quartile flow) 4.432.874 80 3.7272.479 90 2.4121.784 91 2.2871.701 92 2.1691.617 93 2.0491.529 94 1.9191.441 95 1.7581.331 96 1.5971.218 97 1.4221.092 98 1.2020.961 99 0.9590.816 100 (minimum recorded flow) 0.2310.231
Statistical analysis of river flow data in the Horizons Region 66
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 255.837 disturbance MAF/median 45.361 indicators FRE3 (floods/year or season) 13.03812.169 STD Annual FRE3 2.6864.884 Mean Days of Accrual (days) 21.56521.773 STD Accrual (days) 23.80421.823 Min Accrual (days) 55 Max Accrual (days) 186147
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 67
4.2.20. Mangatera at Dannevirke 1 (synthetic) (32541), Jul-1955 to Jul-2004 (all data)
Site Mangatera at Dannevirke 1 (synthetic)
Time series Data Start Time 3-Jan-55 details Data End Time 14-Apr-05 Analysis Start time 1-Jul-55 Analysis End time 1-Jul-04 Years of record analysed49 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 1.607 MALF 0.272 ½ median 0.4160.251 3x median 2.4931.503 MAF 50.197 Flow 0 (maximum recorded flow) 138.398 138.398 variability 10 3.0671.675 percentiles 20 1.9611.047 25 (upper quartile flow) 1.6390.89 30 1.4050.771 40 1.0740.611 50 (median flow) 0.8310.501 60 0.6520.425 70 0.5130.365 75 (lower quartile flow) 0.4570.341 80 0.4020.317 90 0.3150.272 91 0.3070.267 92 0.2980.263 93 0.2890.258 94 0.2810.253 95 0.2720.248 96 0.2630.243 97 0.2530.237 98 0.2430.23 99 0.230.219 100 (minimum recorded flow) 0.1910.191
Statistical analysis of river flow data in the Horizons Region 68
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 184.548 disturbance MAF/median 60.406 indicators FRE3 (floods/year or season) 8.8778.595 STD Annual FRE3 2.7213.921 Mean Days of Accrual (days) 33.99330.398 STD Accrual (days) 42.05131.534 Min Accrual (days) 55 Max Accrual (days) 269180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 69
4.2.21. Mangatera at Dannevirke 2 (synthetic) (500), Jul-1955 to Jul-2004 (all data)
Site Mangatera at Dannevirke 2 (synthetic)
Time series Data Start Time 3-Jan-55 details Data End Time 14-Apr-05 Analysis Start time 1-Jul-55 Analysis End time 1-Jul-04 Years of record analysed49 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 1.821 MALF 0.22 ½ median 0.4450.248 3x median 2.671.485 MAF 60.069 Flow 0 (maximum recorded flow) 165.802 165.802 variability 10 3.5711.902 percentiles 20 2.2451.149 25 (upper quartile flow) 1.8590.961 30 1.5780.818 40 1.1820.627 50 (median flow) 0.890.495 60 0.6760.404 70 0.510.332 75 (lower quartile flow) 0.4420.302 80 0.3760.273 90 0.2720.22 91 0.2620.214 92 0.2510.209 93 0.2410.203 94 0.230.197 95 0.220.191 96 0.2090.185 97 0.1970.178 98 0.1850.169 99 0.1690.158 100 (minimum recorded flow) 0.1230.123
Statistical analysis of river flow data in the Horizons Region 70
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 273.041 disturbance MAF/median 67.493 indicators FRE3 (floods/year or season) 8.9998.881 STD Annual FRE3 2.5243.744 Mean Days of Accrual (days) 32.73828.972 STD Accrual (days) 39.32330.012 Min Accrual (days) 55 Max Accrual (days) 262184
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 71
4.2.22. Oroua at Almadale All (800), Jul-1948 to Jul-2004 (all data)
Site Oroua at Almadale All
Time series Data Start Time 3-Dec-47 details Data End Time 3-Apr-05 Analysis Start time 1-Jul-48 Analysis End time 1-Jul-04 Years of record analysed56 Gaps in the data (% of record). 24.1
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 10.711 MALF 1.211 ½ median 3.5521.921 3x median 21.31211.523 MAF 173.85 Flow 0 (maximum recorded flow) 449.847 449.847 variability 10 22.39213.599 percentiles 20 15.5628.581 25 (upper quartile flow) 13.3727.193 30 11.6856.165 40 9.0864.753 50 (median flow) 7.1043.841 60 5.4113.113 70 4.0952.452 75 (lower quartile flow) 3.4992.148 80 2.931.876 90 1.8741.395 91 1.7821.337 92 1.6881.285 93 1.5941.237 94 1.4991.19 95 1.3961.13 96 1.2871.073 97 1.1911.011 98 1.0740.926 99 0.9270.813 100 (minimum recorded flow) 0.4130.413
Statistical analysis of river flow data in the Horizons Region 72
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 145.117 disturbance MAF/median 24.472 indicators FRE3 (floods/year or season) 9.8589.789 STD Annual FRE3 2.6123.524 Mean Days of Accrual (days) 31.96628.219 STD Accrual (days) 36.36626.628 Min Accrual (days) 55 Max Accrual (days) 213163
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 73
4.2.23. Oroua at Awahuri Br (1932512), Jul-1992 to Jul-2004 (all data)
Site Oroua at Awahuri Br
Time series Data Start Time 19-Dec-91 details Data End Time 3-Apr-05 Analysis Start time 1-Jul-92 Analysis End time 1-Jul-04 Years of record analysed12 Gaps in the data (% of record). 0.55
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 12.611 MALF 1.62 ½ median 3.9082.252 3x median 23.44813.509 MAF 216.07 Flow 0 (maximum recorded flow) 879.955 879.955 variability 10 26.92314.5 percentiles 20 17.7499.564 25 (upper quartile flow) 15.1258.257 30 13.0097.181 40 10.0185.541 50 (median flow) 7.8164.503 60 6.0583.681 70 4.6552.994 75 (lower quartile flow) 4.0572.684 80 3.482.401 90 2.3851.854 91 2.271.79 92 2.1731.719 93 2.071.65 94 1.9731.585 95 1.8541.531 96 1.7271.475 97 1.5931.403 98 1.4731.307 99 1.3121.189 100 (minimum recorded flow) 0.90.9
Statistical analysis of river flow data in the Horizons Region 74
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 133.377 disturbance MAF/median 27.645 indicators FRE3 (floods/year or season) 10.4169.738 STD Annual FRE3 1.9253.724 Mean Days of Accrual (days) 28.57326.318 STD Accrual (days) 30.60926.319 Min Accrual (days) 55 Max Accrual (days) 172132
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 75
4.2.24. Oroua at Kawa Wool (synthetic) (700), Jul-1967 to Jul-2004 (all data)
Site Oroua at Kawa Wool (synthetic)
Time series Data Start Time 3-Feb-67 details Data End Time 3-Apr-05 Analysis Start time 1-Jul-67 Analysis End time 1-Jul-04 Years of record analysed37 Gaps in the data (% of record). 0.18
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 11.376 MALF 1.24 ½ median 3.4861.98 3x median 20.91311.88 MAF 204.83 Flow 0 (maximum recorded flow) 790.154 790.154 variability 10 24.18713.003 percentiles 20 16.0788.302 25 (upper quartile flow) 13.7017.067 30 11.8096.133 40 9.0274.873 50 (median flow) 6.9713.96 60 5.4093.232 70 4.2042.633 75 (lower quartile flow) 3.6232.369 80 3.0942.111 90 2.0921.594 91 1.9951.54 92 1.9011.485 93 1.8061.43 94 1.6991.377 95 1.5931.321 96 1.4851.253 97 1.381.179 98 1.2531.092 99 1.0920.969 100 (minimum recorded flow) 0.6380.638
Statistical analysis of river flow data in the Horizons Region 76
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 165.185 disturbance MAF/median 29.383 indicators FRE3 (floods/year or season) 9.86410.67 STD Annual FRE3 2.7173.203 Mean Days of Accrual (days) 30.39125.848 STD Accrual (days) 36.24922.547 Min Accrual (days) 55 Max Accrual (days) 226131
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 77
4.2.25. Pohangina at Mais Reach (32576), Jul-1969 to Jul-2005 (all data)
Site Pohangina at Mais Reach
Time series Data Start Time 10-Jun-69 details Data End Time 10-Aug-05 Analysis Start time 1-Jul-69 Analysis End time 1-Jul-05 Years of record analysed36 Gaps in the data (% of record). 0.01
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 17.214 MALF 2.315 ½ median 5.0063.1 3x median 30.03618.597 MAF 489.99 Flow 0 (maximum recorded flow) 1109.1 1109.1 variability 10 33.51721.929 percentiles 20 21.81913.337 25 (upper quartile flow) 18.64311.327 30 16.169.802 40 12.5897.66 50 (median flow) 10.0126.199 60 7.9975.154 70 6.3374.309 75 (lower quartile flow) 5.5913.923 80 4.9193.592 90 3.5822.927 91 3.4612.86 92 3.3292.789 93 3.1942.718 94 3.0682.64 95 2.9312.563 96 2.7952.456 97 2.6432.347 98 2.4652.222 99 2.2221.971 100 (minimum recorded flow) 1.351.35
Statistical analysis of river flow data in the Horizons Region 78
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 211.659 disturbance MAF/median 48.94 indicators FRE3 (floods/year or season) 12.52812.931 STD Annual FRE3 2.5013.175 Mean Days of Accrual (days) 24.19520.854 STD Accrual (days) 24.04717.274 Min Accrual (days) 55 Max Accrual (days) 17293
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 79
4.2.26. Tamaki at SH2(Napier) (1032503), Jul-1977 to Jul-1983 (all data)
Site Tamaki at SH2(Napier)
Time series Data Start Time 1-Nov-76 details Data End Time 1-Jan-84 Analysis Start time 1-Jul-77 Analysis End time 1-Jul-83 Years of record analysed6 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 2.935 MALF 0.207 ½ median 0.8000.487 3x median 4.7972.922 MAF 56.343 Flow 0 (maximum recorded flow) 77.504 56.980 variability 10 6.5543.456 percentiles 20 3.8282.061 25 (upper quartile flow) 3.1921.720 30 2.7281.527 40 2.0551.199 50 (median flow) 1.5990.974 60 1.2710.797 70 0.9960.624 75 (lower quartile flow) 0.8630.558 80 0.7270.491 90 0.4750.321 91 0.4440.299 92 0.4100.282 93 0.3860.262 94 0.3560.242 95 0.3130.220 96 0.2760.199 97 0.2410.173 98 0.1950.154 99 0.1520.124 100 (minimum recorded flow) 0.0300.030
Statistical analysis of river flow data in the Horizons Region 80
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 272.188 disturbance MAF/median 35.258 indicators FRE3 (floods/year or season) 8.3367.726 STD Annual FRE3 3.393.696 Mean Days of Accrual (days) 35.13732.519 STD Accrual (days) 38.75535.63 Min Accrual (days) 55 Max Accrual (days) 209127
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 81
4.2.27. Tamaki at Stephensons (1332556), Dec-2003 to Apr-2005 (all data)
Site Tamaki at Stephensons
Time series Data Start Time 16-Dec-03 details Data End Time 30-Apr-05 Analysis Start time 16-Dec-03 Analysis End time 30-Apr-05 Years of record analysed1 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 4.032 MALF 0.395 ½ median 1.2270.925 3x median 7.3595.547 MAF 158.47 Flow 0 (maximum recorded flow) 158.471 158.471 variability 10 8.6099.034 percentiles 20 5.4015.189 25 (upper quartile flow) 4.5474.254 30 3.8133.489 40 2.9542.485 50 (median flow) 2.4531.849 60 2.0461.388 70 1.5591.175 75 (lower quartile flow) 1.3571.108 80 1.2051.036 90 0.9640.701 91 0.9180.66 92 0.810.638 93 0.740.599 94 0.6780.564 95 0.6350.522 96 0.5740.473 97 0.5090.429 98 0.4320.379 99 0.3680.348 100 (minimum recorded flow) 0.3050.305
Statistical analysis of river flow data in the Horizons Region 82
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 343.753 disturbance MAF/median 64.603 indicators FRE3 (floods/year or season) 6.0048.072 STD Annual FRE3 00 Mean Days of Accrual (days) 34.63625.222 STD Accrual (days) 27.70323.557 Min Accrual (days) 55 Max Accrual (days) 8770
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 83
4.2.28. Tamaki at Water Supply Weir (1032504), Jul-1983 to Jul-2004 (all data)
Site Tamaki at Water Supply Weir
Time series Data Start Time 17-Nov-82 details Data End Time 21-Apr-05 Analysis Start time 1-Jul-83 Analysis End time 1-Jul-04 Years of record analysed21 Gaps in the data (% of record). 5.38
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 1.484 MALF 0.181 ½ median 0.4870.339 3x median 2.9192.031 MAF 29.857 Flow 0 (maximum recorded flow) 91.272 91.272 variability 10 2.9631.936 percentiles 20 1.9341.327 25 (upper quartile flow) 1.6861.149 30 1.4981.012 40 1.1990.826 50 (median flow) 0.9730.677 60 0.7990.554 70 0.6480.431 75 (lower quartile flow) 0.5720.374 80 0.4930.325 90 0.3220.224 91 0.3020.213 92 0.2810.2 93 0.2640.189 94 0.2450.177 95 0.2240.166 96 0.20.155 97 0.1770.139 98 0.1550.122 99 0.1230.096 100 (minimum recorded flow) 0.0230.023
Statistical analysis of river flow data in the Horizons Region 84
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 164.956 disturbance MAF/median 30.686 indicators FRE3 (floods/year or season) 8.5998.057 STD Annual FRE3 2.2124.081 Mean Days of Accrual (days) 35.69630.619 STD Accrual (days) 36.72530.335 Min Accrual (days) 55 Max Accrual (days) 221148
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 85
4.2.29. Tiraumea at Ngaturi (32529), Jul-1980 to Jul-2004 (all data)
Site Tiraumea at Ngaturi
Time series Data Start Time 17-Dec-79 details Data End Time 18-Oct-04 Analysis Start time 1-Jul-80 Analysis End time 1-Jul-04 Years of record analysed24 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 15.66 MALF 2.383 ½ median 3.6062.126 3x median 21.63312.756 MAF 302.15 Flow 0 (maximum recorded flow) 739.057 739.057 variability 10 34.0214.629 percentiles 20 19.1958.36 25 (upper quartile flow) 15.6297.03 30 13.0586.191 40 9.5665.025 50 (median flow) 7.2114.252 60 5.6223.629 70 4.4143.17 75 (lower quartile flow) 3.8952.958 80 3.4432.749 90 2.7052.435 91 2.6432.406 92 2.5832.376 93 2.5242.344 94 2.4672.311 95 2.4122.27 96 2.3542.218 97 2.292.167 98 2.1912.089 99 2.0451.956 100 (minimum recorded flow) 1.5671.612
Statistical analysis of river flow data in the Horizons Region 86
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 126.794 disturbance MAF/median 41.901 indicators FRE3 (floods/year or season) 10.5418.645 STD Annual FRE3 2.3895.02 Mean Days of Accrual (days) 27.22530.86 STD Accrual (days) 38.04536.391 Min Accrual (days) 55 Max Accrual (days) 205172
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 87
4.2.30. Tokomaru All (900), Jul-1980 to Jul-2005 (all data)
Site Tokomaru All
Time series Data Start Time 13-Dec-79 details Data End Time 6-Dec-05 Analysis Start time 1-Jul-80 Analysis End time 1-Jul-05 Years of record analysed25 Gaps in the data (% of record). 0.12
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 2.314 MALF 0.247 ½ median 0.6250.439 3x median 3.7472.631 MAF 98.882 Flow 0 (maximum recorded flow) 169.711 169.711 variability 10 4.5093.503 percentiles 20 2.7962.049 25 (upper quartile flow) 2.3651.709 30 2.0411.456 40 1.5881.108 50 (median flow) 1.2490.877 60 0.9850.709 70 0.770.575 75 (lower quartile flow) 0.6770.513 80 0.5880.451 90 0.4150.325 91 0.3950.312 92 0.3750.298 93 0.3540.284 94 0.3320.267 95 0.3090.247 96 0.2830.228 97 0.250.208 98 0.2180.185 99 0.1840.161 100 (minimum recorded flow) 0.1080.108
Statistical analysis of river flow data in the Horizons Region 88
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 403.6 disturbance MAF/median 79.169 indicators FRE3 (floods/year or season) 15.20114.671 STD Annual FRE3 2.6334.012 Mean Days of Accrual (days) 18.86717.648 STD Accrual (days) 17.60316.833 Min Accrual (days) 55 Max Accrual (days) 145125
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 89
4.2.31. Turitea at Ngahere Park Rd (1132501), Jul-2001 to Jul-2006 (all data)
Site Turitea at Ngahere Park Rd
Time series Data Start Time 25-Aug-00 details Data End Time 14-Aug-06 Analysis Start time 1-Jul-01 Analysis End time 1-Jul-06 Years of record analysed5 Gaps in the data (% of record). 1.44
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 0.775 MALF 0.039 ½ median 0.1930.104 3x median 1.1550.624 MAF 22.639 Flow 0 (maximum recorded flow) 52.729 50.15 variability 10 1.6931.185 percentiles 20 1.0510.714 25 (upper quartile flow) 0.8820.598 30 0.7530.503 40 0.5690.313 50 (median flow) 0.3850.208 60 0.2630.124 70 0.1620.088 75 (lower quartile flow) 0.1150.078 80 0.0910.07 90 0.0660.054 91 0.0640.052 92 0.0610.051 93 0.0580.049 94 0.0560.048 95 0.0530.046 96 0.0510.044 97 0.0470.042 98 0.0440.04 99 0.040.037 100 (minimum recorded flow) 0.0070.007
Statistical analysis of river flow data in the Horizons Region 90
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 539.024 disturbance MAF/median 58.803 indicators FRE3 (floods/year or season) 108.059 STD Annual FRE3 2.2264.718 Mean Days of Accrual (days) 26.52326.95 STD Accrual (days) 34.32834.235 Min Accrual (days) 55 Max Accrual (days) 169132
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 91
4.2.32. Puke Puke at Lake Outlet (32602), Jul-1971 to Jul-1980 (all data)
Site Puke Puke at Lake Outlet
Time series Data Start Time 24-Jun-71 details Data End Time 1-Jul-80 Analysis Start time 1-Jul-71 Analysis End time 1-Jul-80 Years of record analysed9 Gaps in the data (% of record).None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 0.112 MALF 0.003 ½ median 0.0160.004 3x median 0.0960.024 MAF 1.312 Flow 0 (maximum recorded flow) 2.256 0.49 variability 10 0.3310.051 percentiles 20 0.170.029 25 (upper quartile flow) 0.1290.021 30 0.0990.015 40 0.060.01 50 (median flow) 0.0320.008 60 0.0130.006 70 0.0080.004 75 (lower quartile flow) 0.0070.004 80 0.0050.003 90 0.0030.002 91 0.0030.002 92 0.0020.002 93 0.0020.002 94 0.0020.002 95 0.0020.001 96 0.0020.001 97 0.0020.001 98 0.0010.001 99 0.0010.001 100 (minimum recorded flow) 00
Statistical analysis of river flow data in the Horizons Region 92
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 437.333 disturbance MAF/median 41 indicators FRE3 (floods/year or season) 3.9982.459 STD Annual FRE3 2.3422.613 Mean Days of Accrual (days) 62.13981 STD Accrual (days) 86.95969.665 Min Accrual (days) 58 Max Accrual (days) 277180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 93
Statistical analysis of river flow data in the Horizons Region 94
4.3. Rangitikei Catchments
The list below shows: section number in this report, site name, (site number) and full date range. The analysis date range is from the first July after the start date until the last June before the finish date.
3.3.1. Forest Rd Drain at Drop Structure (32747), Jul-1974 to Jul-2006 (all data)
3.3.2. Hautapu Taihape All (100), Jul-1963 to Jul-2004 (all data)
3.3.3. Makohine at Viaduct (32754), Jul-1977 to Jul-2004 (all data)
3.3.4. Maungaraupi at Maungaraupi (32723), Jul-1970 to Jul-1975 (all data)
3.3.5. Moawhango at Moawhango (32733), Jul-1964 to Jul-2005 (all data)
3.3.6. Moawhango at Moawhango (32733), Jul-1964 to Jul-1978 (pre-diversion)
3.3.7. Moawhango at Moawhango (32733), Jul-1979 to Jul-2004 (post-diversion)
3.3.8. Moawhango at Moawhango (sim natural) (327330), Jul-1964 to Jul-2003 (all data)
3.3.9. Moawhango at Moawhango (sim natural) (327330), Jul-1964 to Jul-1978 (pre-div.)
3.3.10. Moawhango at Moawhango (sim natural) (327330), Jul-1979 to Jul-2003 (post-div.)
3.3.11. Moawhango at Waiouru (32732), Jul-1960 to Jul-2005 (all data)
3.3.12. Moawhango at Waiouru (32732), Jul-1960 to Jul-1978 (pre-diversion)
3.3.13. Moawhango at Waiouru (32732), Jul-1979 to Jul-2004 (post-diversion)
3.3.14. Moawhango at Waiouru (sim natural) (46060), Jul-1960 to Jul-2003 (all data)
3.3.15. Moawhango at Waiouru (sim natural) (46060), Jul-1960 to Jul-1978 (pre-diversion)
3.3.16. Moawhango at Waiouru (sim natural) (46060), Jul-1979 to Jul-2003 (post-diversion)
3.3.17. Porewa at Tututotara (32715), Jul-1963 to Jul-1991 (all data)
3.3.18. Rangitawa at Halcombe (32735), Jul-1969 to Jul-1980 (all data)
3.3.19. Rangitikei at Mangaweka (32702), Jul-1969 to Jul-2004 (all data)
3.3.20. Rangitikei at Mangaweka (32702), Jul-1969 to Jul-1978 (pre-diversion)
3.3.21. Rangitikei at Mangaweka (32702), Jul-1979 to Jul-2004 (post-diversion)
3.3.22. Rangitikei at Mangaweka (sim natural) (327020), Jul-1963 to Jul-2003 (all data)
3.3.23. Rangitikei at Mangaweka (sim natural) (327020), Jul-1963 to Jul-1978 (pre-diversion)
Statistical analysis of river flow data in the Horizons Region 95
3.3.24. Rangitikei at Mangaweka (sim natural) (327020), Jul-1979 to Jul-2003 (post-diversion)
3.3.25. Rangitikei at Onepuhi (32703), Jul-2002 to Jul-2005 (post-diversion)
3.3.26. Rangitikei at Otara (32705), Jul-1963 to Jul-1969 (pre-diversion)
3.3.27. Rangitikei at Pukeokahu (32763), Jul-1999 to Jul-2005 (post-diversion)
3.3.28. Rangitikei at Springvale (32708), Jul-1964 to Jul-1973 (all data)
3.3.29. Tutaenui at Hammond St (32739), Jul-1968 to Jul-1987 (all data)
Statistical analysis of river flow data in the Horizons Region 96
Figure 8: Flow sites in the Rangitikei catchment.
Statistical analysis of river flow data in the Horizons Region 97
4.3.1. Forest Rd Drain at Drop Structure (32747), Jul-1974 to Jul-2006 (all data)
Site Forest Rd Drain at Drop Structure
Time series Data Start Time 29-May-74 details Data End Time 14-Aug-06 Analysis Start time 1-Jul-74 Analysis End time 1-Jul-06 Years of record analysed32 Gaps in the data (% of record). 81.35
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 0.016 MALF 0 ½ median 0.0020.001 3x median 0.0090.003 MAF 1.082 Flow 0 (maximum recorded flow) 2.569 0.617 variability 10 0.0390.009 percentiles 20 0.0240.004 25 (upper quartile flow) 0.020.001 30 0.0150.001 40 0.0090.001 50 (median flow) 0.0030.001 60 0.0010.001 70 0.0010 75 (lower quartile flow) 0.0010 80 00 90 00 91 00 92 00 93 00 94 00 95 00 96 00 97 00 98 00 99 00 100 (minimum recorded flow) 00
Statistical analysis of river flow data in the Horizons Region 98
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF #DIV/0! disturbance MAF/median 360.667 indicators FRE3 (floods/year or season) 3.9984.697 STD Annual FRE3 2.1852.071 Mean Days of Accrual (days) 51.54540.813 STD Accrual (days) 61.67940.362 Min Accrual (days) 57 Max Accrual (days) 185139
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 99
4.3.2. Hautapu Taihape All (100), Jul-1963 to Jul-2004 (all data)
Site Hautapu Taihape All
Time series Data Start Time 2-May-63 details Data End Time 1-Apr-05 Analysis Start time 1-Jul-63 Analysis End time 1-Jul-04 Years of record analysed41 Gaps in the data (% of record). 28.82
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 4.46 MALF 0.745 ½ median 1.40.831 3x median 8.44.983 MAF 46.193 Flow 0 (maximum recorded flow) 206.409 206.409 variability 10 9.7944.739 percentiles 20 6.4723.128 25 (upper quartile flow) 5.4662.716 30 4.7052.403 40 3.5761.987 50 (median flow) 2.81.661 60 2.2071.392 70 1.731.172 75 (lower quartile flow) 1.5141.076 80 1.3030.971 90 0.9440.749 91 0.9090.725 92 0.8730.702 93 0.8310.679 94 0.7850.658 95 0.7370.639 96 0.6940.612 97 0.6520.575 98 0.6060.534 99 0.5360.456 100 (minimum recorded flow) 0.2720.272
Statistical analysis of river flow data in the Horizons Region 100
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 62.004 disturbance MAF/median 16.498 indicators FRE3 (floods/year or season) 6.7925.627 STD Annual FRE3 2.2393.335 Mean Days of Accrual (days) 45.69546.832 STD Accrual (days) 58.33249.472 Min Accrual (days) 55 Max Accrual (days) 279180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 101
4.3.3. Makohine at Viaduct (32754), Jul-1977 to Jul-2004 (all data)
Site Makohine at Viaduct
Time series Data Start Time 22-Mar-77 details Data End Time 12-Apr-05 Analysis Start time 1-Jul-77 Analysis End time 1-Jul-04 Years of record analysed27 Gaps in the data (% of record). 0.14
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 1.208 MALF 0.04 ½ median 0.1630.069 3x median 0.9750.411 MAF 70.905 Flow 0 (maximum recorded flow) 198.549 198.549 variability 10 2.6531.084 percentiles 20 1.2950.456 25 (upper quartile flow) 0.980.343 30 0.7640.268 40 0.490.181 50 (median flow) 0.3250.137 60 0.2170.103 70 0.1490.082 75 (lower quartile flow) 0.1240.072 80 0.0990.064 90 0.0620.05 91 0.060.049 92 0.0570.047 93 0.0550.046 94 0.0520.044 95 0.0490.041 96 0.0460.039 97 0.0420.036 98 0.0380.032 99 0.0310.027 100 (minimum recorded flow) 0.0120.012
Statistical analysis of river flow data in the Horizons Region 102
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 1772.625 disturbance MAF/median 218.169 indicators FRE3 (floods/year or season) 12.18413.51 STD Annual FRE3 2.63.208 Mean Days of Accrual (days) 20.61718.318 STD Accrual (days) 22.13515.827 Min Accrual (days) 55 Max Accrual (days) 172100
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 103
4.3.4. Maungaraupi at Maungaraupi (32723), Jul-1970 to Jul-1975 (all data)
Site Maungaraupi at Maungaraupi
Time series Data Start Time 19-Mar-70 details Data End Time 29-Apr-76 Analysis Start time 1-Jul-70 Analysis End time 1-Jul-75 Years of record analysed5 Gaps in the data (% of record). 0.22
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 0.234 MALF 0 ½ median 0.020.001 3x median 0.1170.006 MAF 20.969 Flow 0 (maximum recorded flow) 28.681 14.574 variability 10 0.5470.06 percentiles 20 0.2710.013 25 (upper quartile flow) 0.2140.006 30 0.170.003 40 0.1050.002 50 (median flow) 0.0390.002 60 0.0050.001 70 0.0030.001 75 (lower quartile flow) 0.0020.001 80 0.0010 90 0.0010 91 0.0010 92 0.0010 93 0.0010 94 00 95 00 96 00 97 00 98 00 99 00 100 (minimum recorded flow) 00
Statistical analysis of river flow data in the Horizons Region 104
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 20969 disturbance MAF/median 537.667 indicators FRE3 (floods/year or season) 7.4017.256 STD Annual FRE3 1.5152.297 Mean Days of Accrual (days) 30.234.15 STD Accrual (days) 38.21628.914 Min Accrual (days) 55 Max Accrual (days) 17899
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 105
4.3.5. Moawhango at Moawhango (32733), Jul-1964 to Jul-2005 (all data)
Site Moawhango at Moawhango
Time series Data Start Time 28-Sep-63 details Data End Time 5-Jan-06 Analysis Start time 1-Jul-64 Analysis End time 1-Jul-05 Years of record analysed41 Gaps in the data (% of record). 13.07
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 7.627 MALF 1.542 ½ median 2.1671.269 3x median 13.0027.611 MAF 101.61 Flow 0 (maximum recorded flow) 282.267 282.267 variability 10 18.03610.628 percentiles 20 11.1766.604 25 (upper quartile flow) 9.3245.371 30 7.9084.476 40 5.7443.251 50 (median flow) 4.3342.537 60 3.3122.031 70 2.5141.645 75 (lower quartile flow) 2.1731.478 80 1.8391.309 90 1.2721.004 91 1.2130.975 92 1.1570.947 93 1.1090.914 94 1.050.88 95 0.9920.837 96 0.9360.802 97 0.8680.771 98 0.7970.732 99 0.7320.67 100 (minimum recorded flow) 0.4890.489
Statistical analysis of river flow data in the Horizons Region 106
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 65.218 disturbance MAF/median 23.445 indicators FRE3 (floods/year or season) 4.7145.526 STD Annual FRE3 3.1754.159 Mean Days of Accrual (days) 61.27243.025 STD Accrual (days) 100.83549.276 Min Accrual (days) 55 Max Accrual (days) 759180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 107
4.3.6. Moawhango at Moawhango (32733), Jul-1964 to Jul-1978 (pre-diversion)
Site Moawhango at Moawhango
Time series Data Start Time 28-Sep-63 details Data End Time 1-Apr-79 Analysis Start time 1-Jul-64 Analysis End time 1-Jul-78 Years of record analysed14 Gaps in the data (% of record). 38.11
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 15.568 MALF 3.535 ½ median 6.2243.902 3x median 37.34423.412 MAF 178.66 Flow 0 (maximum recorded flow) 282.267 282.267 variability 10 30.18816.618 percentiles 20 22.37513.052 25 (upper quartile flow) 20.19111.717 30 18.1310.828 40 14.9719.021 50 (median flow) 12.4487.804 60 10.2486.646 70 8.1535.528 75 (lower quartile flow) 7.3895.015 80 6.4344.619 90 4.6153.617 91 4.4353.414 92 4.2513.142 93 4.062.953 94 3.8762.851 95 3.6212.768 96 3.2312.522 97 2.8742.335 98 2.6112.193 99 2.212.026 100 (minimum recorded flow) 1.8851.885
Statistical analysis of river flow data in the Horizons Region 108
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 50.54 disturbance MAF/median 14.353 indicators FRE3 (floods/year or season) 4.3744.783 STD Annual FRE3 2.2613.216 Mean Days of Accrual (days) 70.37849.208 STD Accrual (days) 66.7738.692 Min Accrual (days) 65 Max Accrual (days) 226142
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 109
4.3.7. Moawhango at Moawhango (32733), Jul-1979 to Jul-2004 (post-diversion)
Site Moawhango at Moawhango
Time series Data Start Time 1-Apr-79 details Data End Time 1-Dec-04 Analysis Start time 1-Jul-79 Analysis End time 1-Jul-04 Years of record analysed25 Gaps in the data (% of record). 0.09
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 4.839 MALF 0.923 ½ median 1.5380.945 3x median 9.2285.667 MAF 78.768 Flow 0 (maximum recorded flow) 272.815 272.815 variability 10 9.7274.879 percentiles 20 6.5793.374 25 (upper quartile flow) 5.5742.987 30 4.8342.686 40 3.8412.25 50 (median flow) 3.0761.889 60 2.4851.611 70 1.9631.361 75 (lower quartile flow) 1.7341.238 80 1.5171.132 90 1.1080.915 91 1.0690.89 92 1.0270.863 93 0.9880.833 94 0.9490.806 95 0.9030.786 96 0.8540.765 97 0.8010.738 98 0.7620.7 99 0.70.648 100 (minimum recorded flow) 0.4890.489
Statistical analysis of river flow data in the Horizons Region 110
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 85.711 disturbance MAF/median 25.607 indicators FRE3 (floods/year or season) 4.964.752 STD Annual FRE3 2.0722.832 Mean Days of Accrual (days) 65.05751.218 STD Accrual (days) 92.03748.314 Min Accrual (days) 55 Max Accrual (days) 619180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 111
4.3.8. Moawhango at Moawhango (sim natural) (327330), Jul-1964 to Jul-2003 (all data)
Site Moawhango at Moawhango (sim natural)
Time series Data Start Time 28-Sep-63 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-64 Analysis End time 1-Jul-03 Years of record analysed39 Gaps in the data (% of record). 13.68
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 14.313 MALF 3.424 ½ median 5.6883.937 3x median 34.12823.619 MAF 136.96 Flow 0 (maximum recorded flow) 373.838 279.351 variability 10 26.97618.761 percentiles 20 20.44713.726 25 (upper quartile flow) 18.26412.29 30 16.52611.156 40 13.6099.275 50 (median flow) 11.3767.873 60 9.476.641 70 7.6625.598 75 (lower quartile flow) 6.8495.142 80 6.0834.756 90 4.6443.937 91 4.4933.841 92 4.3513.73 93 4.2133.612 94 4.053.474 95 3.893.295 96 3.6913.099 97 3.4472.911 98 3.082.731 99 2.7132.361 100 (minimum recorded flow) 1.9101.910
Statistical analysis of river flow data in the Horizons Region 112
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 42.72 disturbance MAF/median 12.039 indicators FRE3 (floods/year or season) 6.067.692 STD Annual FRE3 2.414.039 Mean Days of Accrual (days) 55.80136.276 STD Accrual (days) 55.87133.711 Min Accrual (days) 55 Max Accrual (days) 329180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 113
4.3.9. Moawhango at Moawhango (sim natural) (327330), Jul-1964 to Jul-1978 (pre-diversion)
Site Moawhango at Moawhango (sim natural)
Time series Data Start Time 28-Sep-63 details Data End Time 1-Apr-79 Analysis Start time 1-Jul-64 AnalysisEnd time 1-Jul-78 Years of record analysed14 Gaps in the data (% of record). 38.12
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 15.535 MALF 3.525 ½ median 6.2253.909 3x median 37.3523.451 MAF 158.32 Flow 0 (maximum recorded flow) 245.888 245.888 variability 10 30.17216.611 percentiles 20 22.4113.083 25 (upper quartile flow) 20.2211.756 30 18.13910.848 40 14.9669.041 50 (median flow) 12.457.817 60 10.2466.663 70 8.1235.518 75 (lower quartile flow) 7.2995.01 80 6.3164.618 90 4.4863.607 91 4.3033.405 92 4.1573.135 93 3.9742.951 94 3.7952.853 95 3.4732.768 96 3.062.525 97 2.8232.335 98 2.5392.194 99 2.2082.029 100 (minimum recorded flow) 1.8941.894
Statistical analysis of river flow data in the Horizons Region 114
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 44.913 disturbance MAF/median 12.716 indicators FRE3 (floods/year or season) 4.3744.783 STD Annual FRE3 2.2613.216 Mean Days of Accrual (days) 70.37849.208 STD Accrual (days) 66.7738.692 Min Accrual (days) 65 Max Accrual (days) 226142
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 115
4.3.10. Moawhango at Moawhango (sim natural) (327330), Jul-1979 to Jul-2003 (post-diversion)
Site Moawhango at Moawhango (sim natural)
Time series Data Start Time 1-Apr-79 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-79 Analysis End time 1-Jul-03 Years of record analysed24 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 13.959 MALF 3.443 ½ median 5.5663.968 3x median 33.39323.808 MAF 133.83 Flow 0 (maximum recorded flow) 373.838 279.351 variability 10 25.95219.75 percentiles 20 19.85514.18 25 (upper quartile flow) 17.79512.589 30 16.06611.394 40 13.279.443 50 (median flow) 11.1317.936 60 9.2676.657 70 7.5085.645 75 (lower quartile flow) 6.755.204 80 6.0374.834 90 4.7184.06 91 4.5783.974 92 4.4393.889 93 4.313.787 94 4.183.678 95 4.0213.564 96 3.863.426 97 3.6643.255 98 3.4213.054 99 3.0592.777 100 (minimum recorded flow) 1.9101.910
Statistical analysis of river flow data in the Horizons Region 116
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 42.594 disturbance MAF/median 12.023 indicators FRE3 (floods/year or season) 6.6668.645 STD Annual FRE3 2.5823.998 Mean Days of Accrual (days) 50.98132.689 STD Accrual (days) 48.0229.775 Min Accrual (days) 55 Max Accrual (days) 204159
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 117
4.3.11. Moawhango at Waiouru (32732), Jul-1960 to Jul-2005 (all data)
Site Moawhango at Waiouru
Time series Data Start Time 17-Nov-59 details Data End Time 13-Jan-06 Analysis Start time 1-Jul-60 Analysis End time 1-Jul-05 Years of record analysed45 Gaps in the data (% of record). 52.11
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 8.216 MALF 1.902 ½ median 3.0471.833 3x median 18.28210.998 MAF 101.47 Flow 0 (maximum recorded flow) 173.784 173.784 variability 10 16.9929.767 percentiles 20 12.3867.007 25 (upper quartile flow) 10.9576.126 30 9.7595.475 40 7.8264.449 50 (median flow) 6.0943.666 60 4.6543.151 70 3.4972.604 75 (lower quartile flow) 3.0432.29 80 2.5481.994 90 0.8780.854 91 0.8520.842 92 0.8380.831 93 0.8160.814 94 0.7850.778 95 0.7430.513 96 0.2030.117 97 0.110.087 98 0.0790.065 99 0.0630.054 100 (minimum recorded flow) 0.0050.005
Statistical analysis of river flow data in the Horizons Region 118
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 53.349 disturbance MAF/median 16.651 indicators FRE3 (floods/year or season) 6.8576.908 STD Annual FRE3 2.9694.051 Mean Days of Accrual (days) 43.70641.216 STD Accrual (days) 54.39639.508 Min Accrual (days) 55 Max Accrual (days) 300180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 119
4.3.12. Moawhango at Waiouru (32732), Jul-1960 to Jul-1978 (pre-diversion)
Site Moawhango at Waiouru
Time series Data Start Time 17-Nov-59 details Data End Time 1-Apr-79 Analysis Start time 1-Jul-60 Analysis End time 1-Jul-78 Years of record analysed18 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 9.162 MALF 2.084 ½ median 3.5222.018 3x median 21.12912.108 MAF 102.84 Flow 0 (maximum recorded flow) 173.784 173.784 variability 10 17.75110.149 percentiles 20 13.1867.4 25 (upper quartile flow) 11.6996.598 30 10.5645.873 40 8.6664.872 50 (median flow) 7.0434.036 60 5.5943.488 70 4.3593.069 75 (lower quartile flow) 3.8292.822 80 3.3912.6 90 2.5772.092 91 2.4782.025 92 2.3781.956 93 2.2771.89 94 2.1721.835 95 2.091.796 96 1.9551.75 97 1.8351.709 98 1.7521.673 99 1.671.604 100 (minimum recorded flow) 0.3660.671
Statistical analysis of river flow data in the Horizons Region 120
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 49.347 disturbance MAF/median 14.602 indicators FRE3 (floods/year or season) 6.3895.595 STD Annual FRE3 2.7263.746 Mean Days of Accrual (days) 50.78948.453 STD Accrual (days) 61.93243.862 Min Accrual (days) 55 Max Accrual (days) 301180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 121
4.3.13. Moawhango at Waiouru (32732), Jul-1979 to Jul-2004 (post-diversion)
Site Moawhango at Waiouru
Time series Data Start Time 1-Apr-79 details Data End Time 1-Dec-04 Analysis Start time 1-Jul-79 Analysis End time 1-Jul-04 Years of record analysed25 Gaps in the data (% of record). 93.79
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 2.333 MALF 0.614 ½ median 0.1130.087 3x median 0.6750.522 MAF Flow 0 (maximum recorded flow) 126.846 126.846 variability 10 4.6320.999 percentiles 20 0.8580.859 25 (upper quartile flow) 0.8380.843 30 0.8060.827 40 0.7590.782 50 (median flow) 0.2250.174 60 0.1190.104 70 0.090.082 75 (lower quartile flow) 0.0780.073 80 0.0720.064 90 0.060.049 91 0.0590.047 92 0.0570.046 93 0.0560.044 94 0.0550.043 95 0.0530.041 96 0.0480.04 97 0.0430.038 98 0.0380.037 99 0.0330.035 100 (minimum recorded flow) 0.0050.005
Statistical analysis of river flow data in the Horizons Region 122
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 0 disturbance MAF/median 0 indicators FRE3 (floods/year or season) 3.9926.021 STD Annual FRE3 00 Mean Days of Accrual (days) 52.33339 STD Accrual (days) 11.7190 Min Accrual (days) 3939 Max Accrual (days) 6139
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 123
4.3.14. Moawhango at Waiouru (sim natural) (46060), Jul-1960 to Jul-2003 (all data)
Site Moawhango at Waiouru (sim natural)
Time series Data Start Time 17-Nov-59 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-60 Analysis End time 1-Jul-03 Years of record analysed43 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 9.401 MALF 2.26 ½ median 3.6022.453 3x median 21.60914.718 MAF 96.065 Flow 0 (maximum recorded flow) 156.762 152.499 variability 10 18.05213.323 percentiles 20 13.3039.342 25 (upper quartile flow) 11.8268.151 30 10.6527.231 40 8.7725.902 50 (median flow) 7.2034.906 60 5.8924.094 70 4.6993.526 75 (lower quartile flow) 4.1823.286 80 3.7553.043 90 2.9522.439 91 2.8472.366 92 2.7462.293 93 2.6522.223 94 2.5392.146 95 2.4162.075 96 2.2861.974 97 2.1421.859 98 1.9751.773 99 1.7741.687 100 (minimum recorded flow) 0.6540.654
Statistical analysis of river flow data in the Horizons Region 124
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 42.507 disturbance MAF/median 13.337 indicators FRE3 (floods/year or season) 7.9768.902 STD Annual FRE3 3.1875.107 Mean Days of Accrual (days) 42.27331.856 STD Accrual (days) 47.56234.14 Min Accrual (days) 55 Max Accrual (days) 301180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 125
4.3.15. Moawhango at Waiouru (sim natural) (46060), Jul-1960 to Jul-1978 (pre-diversion)
Site Moawhango at Waiouru (sim natural)
Time series Data Start Time 17-Nov-59 details Data End Time 1-Apr-79 Analysis Start time 1-Jul-60 Analysis End time 1-Jul-78 Years of record analysed18 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 9.149 MALF 2.081 ½ median 3.5192.013 3x median 21.11112.075 MAF 93.696 Flow 0 (maximum recorded flow) 143.655 143.655 variability 10 17.77110.105 percentiles 20 13.1887.386 25 (upper quartile flow) 11.7076.573 30 10.5645.864 40 8.674.855 50 (median flow) 7.0374.025 60 5.5633.481 70 4.3143.062 75 (lower quartile flow) 3.7962.821 80 3.3652.597 90 2.5652.089 91 2.4642.022 92 2.3661.954 93 2.271.888 94 2.1691.836 95 2.0871.796 96 1.9551.751 97 1.8361.71 98 1.7521.673 99 1.6711.605 100 (minimum recorded flow) 1.4721.472
Statistical analysis of river flow data in the Horizons Region 126
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 45.025 disturbance MAF/median 13.315 indicators FRE3 (floods/year or season) 6.3895.595 STD Annual FRE3 2.7263.746 Mean Days of Accrual (days) 50.78148.453 STD Accrual (days) 61.91643.862 Min Accrual (days) 55 Max Accrual (days) 301180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 127
4.3.16. Moawhango at Waiouru (sim natural) (46060), Jul-1979 to Jul-2003 (post-diversion)
Site Moawhango at Waiouru (sim natural)
Time series Data Start Time 1-Apr-79 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-79 Analysis End time 1-Jul-03 Years of record analysed24 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 9.624 MALF 2.423 ½ median 3.6722.845 3x median 22.03217.067 MAF 98.764 Flow 0 (maximum recorded flow) 156.762 152.499 variability 10 18.33615.803 percentiles 20 13.45610.986 25 (upper quartile flow) 11.9699.653 30 10.7878.509 40 8.9046.853 50 (median flow) 7.3445.689 60 6.14.696 70 4.9643.99 75 (lower quartile flow) 4.4453.704 80 4.0143.434 90 3.2542.866 91 3.172.804 92 3.0852.736 93 2.9972.652 94 2.892.571 95 2.7882.482 96 2.6622.391 97 2.5212.29 98 2.3712.178 99 2.1792.046 100 (minimum recorded flow) 1.7041.704
Statistical analysis of river flow data in the Horizons Region 128
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 40.761 disturbance MAF/median 13.448 indicators FRE3 (floods/year or season) 9.16611.417 STD Annual FRE3 2.9714.218 Mean Days of Accrual (days) 36.78725.697 STD Accrual (days) 33.45822.884 Min Accrual (days) 55 Max Accrual (days) 201100
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 129
4.3.17. Porewa at Tututotara (32715), Jul-1963 to Jul-1991 (all data)
Site Porewa at Tututotara
Time series Data Start Time 25-Mar-63 details Data End Time 30-Jul-91 Analysis Start time 1-Jul-63 Analysis End time 1-Jul-91 Years of record analysed28 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 0.868 MALF 0.001 ½ median 0.1140.029 3x median 0.6840.171 MAF 28.504 Flow 0 (maximum recorded flow) 105.351 105.351 variability 10 1.9320.616 percentiles 20 0.9580.272 25 (upper quartile flow) 0.7320.201 30 0.5770.156 40 0.3620.094 50 (median flow) 0.2280.057 60 0.1390.032 70 0.0740.016 75 (lower quartile flow) 0.0470.009 80 0.0280.005 90 0.0060.003 91 0.0060.002 92 0.0050.002 93 0.0040.002 94 0.0040.002 95 0.0030.001 96 0.0030.001 97 0.0020.001 98 0.0010.001 99 0.0010 100 (minimum recorded flow) 00
Statistical analysis of river flow data in the Horizons Region 130
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 28504 disturbance MAF/median 125.018 indicators FRE3 (floods/year or season) 10.28512.235 STD Annual FRE3 2.9143.103 Mean Days of Accrual (days) 24.34419.311 STD Accrual (days) 28.2117.996 Min Accrual (days) 55 Max Accrual (days) 186101
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 131
4.3.18. Rangitawa at Halcombe (32735), Jul-1969 to Jul-1980 (all data)
Site Rangitawa at Halcombe
Time series Data Start Time 25-Mar-69 details Data End Time 7-Oct-80 Analysis Start time 1-Jul-69 Analysis End time 1-Jul-80 Years of record analysed11 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 0.333 MALF 0.001 ½ median 0.0030.001 3x median 0.0150.006 MAF 36.027 Flow 0 (maximum recorded flow) 80.793 37.654 variability 10 0.5780.008 percentiles 20 0.1460.005 25 (upper quartile flow) 0.0790.004 30 0.040.003 40 0.010.003 50 (median flow) 0.0050.002 60 0.0040.002 70 0.0030.002 75 (lower quartile flow) 0.0020.002 80 0.0020.001 90 0.0010.001 91 0.0010.001 92 0.0010.001 93 0.0010.001 94 0.0010.001 95 00.001 96 00.001 97 00.001 98 00.001 99 00 100 (minimum recorded flow) 00
Statistical analysis of river flow data in the Horizons Region 132
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 36027 disturbance MAF/median 7205.4 indicators FRE3 (floods/year or season) 4.4537.323 STD Annual FRE3 1.5043.011 Mean Days of Accrual (days) 50.61235.327 STD Accrual (days) 63.3832.748 Min Accrual (days) 55 Max Accrual (days) 273127
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 133
4.3.19. Rangitikei at Mangaweka (32702), Jul-1969 to Jul-2004 (all data)
Site Rangitikei at Mangaweka
Time series Data Start Time 29-Apr-69 details Data End Time 12-Apr-05 Analysis Start time 1-Jul-69 Analysis End time 1-Jul-04 Years of record analysed35 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 62.939 MALF 13.725 ½ median 22.51914.247 3x median 135.11185.482 MAF 720.01 Flow 0 (maximum recorded flow) 2493.1 2493.1 variability 10 122.4673.35 percentiles 20 87.31851.063 25 (upper quartile flow) 77.12944.955 30 68.83940.243 40 55.74333.379 50 (median flow) 45.03728.494 60 36.74124.655 70 29.77221.461 75 (lower quartile flow) 26.54419.926 80 23.66118.454 90 18.30815.576 91 17.78315.25 92 17.20714.874 93 16.6314.437 94 16.10414.058 95 15.53513.715 96 14.81213.301 97 14.03212.754 98 13.26512.012 99 12.01311.427 100 (minimum recorded flow) 9.0389.038
Statistical analysis of river flow data in the Horizons Region 134
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 52.46 disturbance MAF/median 15.987 indicators FRE3 (floods/year or season) 8.4568.23 STD Annual FRE3 2.7573.095 Mean Days of Accrual (days) 38.37533.787 STD Accrual (days) 45.12429.801 Min Accrual (days) 55 Max Accrual (days) 298159
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 135
4.3.20. Rangitikei at Mangaweka (32702), Jul-1969 to Jul-1978 (pre-diversion)
Site Rangitikei at Mangaweka
Time series Data Start Time 29-Apr-69 details Data End Time 1-Apr-79 Analysis Start time 1-Jul-69 Analysis End time 1-Jul-78 Years of record analysed9 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 66.809 MALF 13.347 ½ median 25.01913.633 3x median 150.11481.798 MAF 710.41 Flow 0 (maximum recorded flow) 906.259 783.943 variability 10 130.75767.933 percentiles 20 92.97148.507 25 (upper quartile flow) 82.94442.904 30 74.6438.411 40 61.40631.7 50 (median flow) 50.03827.266 60 40.02523.584 70 30.61220.408 75 (lower quartile flow) 26.70419.048 80 23.34217.758 90 17.78914.944 91 17.18814.377 92 16.65913.917 93 16.17113.612 94 15.73313.243 95 14.98912.774 96 13.94112.262 97 13.26411.853 98 12.27711.606 99 11.62511.111 100 (minimum recorded flow) 10.49610.496
Statistical analysis of river flow data in the Horizons Region 136
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 53.226 disturbance MAF/median 14.197 indicators FRE3 (floods/year or season) 7.7767.387 STD Annual FRE3 3.1461.997 Mean Days of Accrual (days) 42.41441.447 STD Accrual (days) 56.15831.513 Min Accrual (days) 55 Max Accrual (days) 299116
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 137
4.3.21. Rangitikei at Mangaweka (32702), Jul-1979 to Jul-2004 (post-diversion)
Site Rangitikei at Mangaweka
Time series Data Start Time 1-Apr-79 details Data End Time 12-Apr-05 Analysis Start time 1-Jul-79 Analysis End time 1-Jul-04 Years of record analysed25 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 61.544 MALF 13.859 ½ median 21.64814.411 3x median 129.88886.463 MAF 734.29 Flow 0 (maximum recorded flow) 2493.1 2493.1 variability 10 119.88974.917 percentiles 20 85.27251.618 25 (upper quartile flow) 75.01445.326 30 66.56340.503 40 53.50833.718 50 (median flow) 43.29628.821 60 35.65524.893 70 29.34221.707 75 (lower quartile flow) 26.29720.222 80 23.64818.712 90 18.44815.722 91 17.95315.43 92 17.40115.069 93 16.80114.668 94 16.23614.298 95 15.6513.96 96 15.00413.567 97 14.23113.129 98 13.51912.457 99 12.36311.503 100 (minimum recorded flow) 9.0389.038
Statistical analysis of river flow data in the Horizons Region 138
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 52.983 disturbance MAF/median 16.96 indicators FRE3 (floods/year or season) 8.6398.539 STD Annual FRE3 2.6743.443 Mean Days of Accrual (days) 37.74232.289 STD Accrual (days) 43.09329.377 Min Accrual (days) 55 Max Accrual (days) 230159
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 139
4.3.22. Rangitikei at Mangaweka (sim natural) (327020), Jul-1963 to Jul-2003 (all data)
Site Rangitikei at Mangaweka (sim natural)
Time series Data Start Time 4-May-63 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-63 Analysis End time 1-Jul-03 Years of record analysed40 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 70.328 MALF 15.754 ½ median 26.17316.956 3x median 157.035101.736 MAF 692.44 Flow 0 (maximum recorded flow) 1225 1101 variability 10 136.03185.633 percentiles 20 98.260.481 25 (upper quartile flow) 86.94853.438 30 78.08347.868 40 63.80940.072 50 (median flow) 52.34533.912 60 43.06128.983 70 35.17324.839 75 (lower quartile flow) 31.33723.045 80 27.65921.297 90 21.10817.568 91 20.44517.119 92 19.7816.702 93 19.05916.301 94 18.32615.902 95 17.55815.394 96 16.69214.696 97 15.90113.947 98 14.68213.252 99 13.26312.153 100 (minimum recorded flow) 10.51810.518
Statistical analysis of river flow data in the Horizons Region 140
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 43.953 disturbance MAF/median 13.228 indicators FRE3 (floods/year or season) 8.0998.361 STD Annual FRE3 2.773.427 Mean Days of Accrual (days) 40.80934.01 STD Accrual (days) 48.43930.992 Min Accrual (days) 55 Max Accrual (days) 325159
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 141
4.3.23. Rangitikei at Mangaweka (sim natural) (327020), Jul-1963 to Jul-1978 (pre-diversion)
Site Rangitikei at Mangaweka (sim natural)
Time series Data Start Time 4-May-63 details Data End Time 1-Apr-79 Analysis Start time 1-Jul-63 Analysis End time 1-Jul-78 Years of record analysed15 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 71.664 MALF 14.599 ½ median 26.93715.961 3x median 161.61995.763 MAF 721.46 Flow 0 (maximum recorded flow) 1101 1101 variability 10 140.47582.044 percentiles 20 99.64958.796 25 (upper quartile flow) 88.33651.704 30 79.60746.287 40 65.76438.069 50 (median flow) 53.87331.921 60 43.66226.84 70 34.44122.879 75 (lower quartile flow) 30.19721.047 80 26.07619.355 90 19.39215.886 91 18.66115.488 92 17.97714.971 93 17.24814.31 94 16.50313.872 95 15.90113.475 96 15.02113.059 97 13.90612.534 98 13.05411.902 99 11.91711.478 100 (minimum recorded flow) 10.51810.518
Statistical analysis of river flow data in the Horizons Region 142
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 49.418 disturbance MAF/median 13.392 indicators FRE3 (floods/year or season) 7.9987.923 STD Annual FRE3 2.8243.264 Mean Days of Accrual (days) 41.34537.426 STD Accrual (days) 54.48733.944 Min Accrual (days) 55 Max Accrual (days) 325134
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 143
4.3.24. Rangitikei at Mangaweka (sim natural) (327020), Jul-1979 to Jul-2003 (post-diversion)
Site Rangitikei at Mangaweka (sim natural)
Time series Data Start Time 1-Apr-79 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-79 Analysis End time 1-Jul-03 Years of record analysed24 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 69.755 MALF 16.557 ½ median 25.77817.519 3x median 154.668105.111 MAF 685.92 Flow 0 (maximum recorded flow) 1225 1004 variability 10 134.20287.396 percentiles 20 97.7461.515 25 (upper quartile flow) 86.58554.412 30 77.49648.706 40 62.93541.027 50 (median flow) 51.55635.037 60 42.78830.208 70 35.39526.12 75 (lower quartile flow) 31.83324.242 80 28.42322.495 90 22.1818.933 91 21.56318.549 92 20.91418.108 93 20.25617.647 94 19.56517.192 95 18.84316.759 96 18.05216.293 97 17.15215.731 98 16.24514.911 99 14.8813.843 100 (minimum recorded flow) 11.12311.123
Statistical analysis of river flow data in the Horizons Region 144
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 41.428 disturbance MAF/median 13.304 indicators FRE3 (floods/year or season) 8.2498.477 STD Annual FRE3 2.8773.929 Mean Days of Accrual (days) 39.77932.861 STD Accrual (days) 44.01129.882 Min Accrual (days) 55 Max Accrual (days) 230159
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 145
4.3.25. Rangitikei at Onepuhi (32703), Jul-2002 to Jul-2005 (post-diversion)
Site Rangitikei at Onepuhi
Time series Data Start Time 19-Feb-02 details Data End Time 11-Jul-05 Analysis Start time 1-Jul-02 Analysis End time 1-Jul-05 Years of record analysed3 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 77.106 MALF 15.375 ½ median 26.63716.319 3x median 159.82297.914 MAF 1095.8 Flow 0 (maximum recorded flow) 1496 1496 variability 10 158.281106.687 percentiles 20 106.8669.118 25 (upper quartile flow) 93.66759.883 30 82.84653.12 40 65.60742.506 50 (median flow) 53.27432.638 60 40.99826.175 70 30.73122.657 75 (lower quartile flow) 27.03920.755 80 24.2619.283 90 18.65116.171 91 18.05915.976 92 17.4115.784 93 16.90215.601 94 16.4215.399 95 16.0815.172 96 15.70914.924 97 15.34314.643 98 14.85514.302 99 14.30513.852 100 (minimum recorded flow) 12.98612.986
Statistical analysis of river flow data in the Horizons Region 146
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 71.272 disturbance MAF/median 20.569 indicators FRE3 (floods/year or season) 7.9979.391 STD Annual FRE3 0.9884.157 Mean Days of Accrual (days) 31.0826.933 STD Accrual (days) 37.15424.013 Min Accrual (days) 55 Max Accrual (days) 15373
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 147
4.3.26. Rangitikei at Otara (32705), Jul-1963 to Jul-1969 (pre-diversion)
Site Rangitikei at Otara
Time series Data Start Time 4-May-63 details Data End Time 21-Aug-69 Analysis Start time 1-Jul-63 Analysis End time 1-Jul-69 Years of record analysed6 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 79.856 MALF 16.684 ½ median 30.1220.693 3x median 180.717124.158 MAF 929.23 Flow 0 (maximum recorded flow) 1135.5 1135.5 variability 10 155.467104.977 percentiles 20 110.90773.599 25 (upper quartile flow) 98.14565.679 30 87.82158.774 40 73.3248.755 50 (median flow) 60.23941.386 60 49.71835.295 70 40.78129.753 75 (lower quartile flow) 36.30126.164 80 32.18223.715 90 23.08718.987 91 22.34618.174 92 21.68517.624 93 20.83116.68 94 20.04115.96 95 18.97715.262 96 17.67314.387 97 15.99314.023 98 14.42413.305 99 13.3312.858 100 (minimum recorded flow) 11.26311.263
Statistical analysis of river flow data in the Horizons Region 148
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 55.696 disturbance MAF/median 15.426 indicators FRE3 (floods/year or season) 7.838.728 STD Annual FRE3 1.3212.754 Mean Days of Accrual (days) 43.39136.333 STD Accrual (days) 44.75333.733 Min Accrual (days) 56 Max Accrual (days) 200134
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 149
4.3.27. Rangitikei at Pukeokahu (32763), Jul-1999 to Jul-2005 (post-diversion)
Site Rangitikei at Pukeokahu
Time series Data Start Time 16-Mar-99 details Data End Time 17-Oct-05 Analysis Start time 1-Jul-99 Analysis End time 1-Jul-05 Years of record analysed6 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 25.839 MALF 5.25 ½ median 8.6895.984 3x median 52.13435.901 MAF 727.52 Flow 0 (maximum recorded flow) 1463.2 1463.2 variability 10 48.49833.229 percentiles 20 33.81222.564 25 (upper quartile flow) 29.43119.541 30 25.95117.274 40 20.95214.312 50 (median flow) 17.37811.967 60 14.4059.819 70 11.6738.11 75 (lower quartile flow) 10.2567.484 80 8.9086.836 90 6.7565.81 91 6.5435.727 92 6.3365.618 93 6.1525.525 94 5.9635.397 95 5.7835.28 96 5.5935.205 97 5.3795.083 98 5.184.922 99 4.9254.797 100 (minimum recorded flow) 4.5354.535
Statistical analysis of river flow data in the Horizons Region 150
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 138.575 disturbance MAF/median 41.864 indicators FRE3 (floods/year or season) 9.3317.715 STD Annual FRE3 1.3614.099 Mean Days of Accrual (days) 34.90934.615 STD Accrual (days) 33.04432.908 Min Accrual (days) 55 Max Accrual (days) 147124
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 151
4.3.28. Rangitikei at Springvale (32708), Jul-1964 to Jul-1973 (all data)
Site Rangitikei at Springvale
Time series Data Start Time 27-Sep-63 details Data End Time 2-May-74 Analysis Start time 1-Jul-64 Analysis End time 1-Jul-73 Years of record analysed9 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 20.679 MALF 4.806 ½ median 6.9815.119 3x median 41.88630.711 MAF 312.41 Flow 0 (maximum recorded flow) 437.309 382.206 variability 10 41.66926.75 percentiles 20 27.07917.582 25 (upper quartile flow) 23.40715.215 30 20.62813.613 40 16.68811.481 50 (median flow) 13.96210.237 60 11.7418.536 70 10.17.291 75 (lower quartile flow) 8.9756.702 80 8.0115.951 90 5.7974.844 91 5.6454.752 92 5.4634.675 93 5.2394.61 94 5.0394.52 95 4.8444.34 96 4.6764.129 97 4.5183.878 98 4.1373.515 99 3.5213.115 100 (minimum recorded flow) 1.7831.783
Statistical analysis of river flow data in the Horizons Region 152
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 65.004 disturbance MAF/median 22.376 indicators FRE3 (floods/year or season) 10.4459.181 STD Annual FRE3 1.944.947 Mean Days of Accrual (days) 30.81728.745 STD Accrual (days) 31.93423.244 Min Accrual (days) 55 Max Accrual (days) 209103
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 153
4.3.29. Tutaenui at Hammond St (32739), Jul-1968 to Jul-1987 (all data)
Site Tutaenui at Hammond St
Time series Data Start Time 30-Mar-68 details Data End Time 27-Aug-87 Analysis Start time 1-Jul-68 Analysis End time 1-Jul-87 Years of record analysed19 Gaps in the data (% of record). 2.76
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 0.367 MALF 0.004 ½ median 0.0240.007 3x median 0.1440.042 MAF 19.843 Flow 0 (maximum recorded flow) 42.308 13.047 variability 10 0.9110.107 percentiles 20 0.3920.051 25 (upper quartile flow) 0.2770.042 30 0.2030.036 40 0.0960.022 50 (median flow) 0.0480.014 60 0.0280.009 70 0.0130.004 75 (lower quartile flow) 0.0090.002 80 0.0050.001 90 0.0020.001 91 0.0020 92 0.0010 93 0.0010 94 0.0010 95 0.0010 96 0.0010 97 0.0010 98 00 99 00 100 (minimum recorded flow) 00
Statistical analysis of river flow data in the Horizons Region 154
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 3968.6 disturbance MAF/median 413.396 indicators FRE3 (floods/year or season) 5.7236.72 STD Annual FRE3 1.9633.794 Mean Days of Accrual (days) 36.70431.731 STD Accrual (days) 52.18136.932 Min Accrual (days) 55 Max Accrual (days) 269169
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 155
4.4. Turakina and Whangaehu Catchments
The list below shows: section number in this report, site name, (site number) and full date range. The analysis date range is from the first July after the start date until the last June before the finish date.
3.4.1. Turakina at Otairi (33004), Jul-1991 to Jul-2004 (all data)
3.4.2. Turakina at SH3 Br (33003), Jul-1977 to Jul-1992 (all data)
3.4.3. Makotuku at SH 49A Br (33117), Jul-1968 to Jul-2005 (all data)
3.4.4. Mangaetoroa at School (33115), Jul-1969 to Jul-2004 (all data)
3.4.5. Mangawhero at Ohakune All (600), Jul-1975 to Jul-2005 (all data)
3.4.6. Mangawhero at Ore Ore (33111), Jul-1962 to Jul-2004 (all data)
3.4.7. Tokiahuru at Whangaehu Junction (33112), Jul-1980 to Jul-1993 (post-diversion)
3.4.8. Wahianoa at Karioi (33116), Jul-1968 to Jul-1972 (pre-diversion)
3.4.9. Waitangi at Tangiwai (33114), Jul-1968 to Jul-1991 (all data)
3.4.10. Whangaehu at Karioi (33107), Jul-1963 to Jul-2003 (all data)
3.4.11. Whangaehu at Karioi (33107), Jul-1963 to Jul-1978 (pre-diversion)
3.4.12. Whangaehu at Karioi (33107), Jul-1979 to Jul-2003 (post-diversion)
3.4.13. Whangaehu at Karioi (sim natural) (331070), Jul-1963 to Jul-2003 (all data)
3.4.14. Whangaehu at Karioi (sim natural) (331070), Jul-1963 to Jul-1978 (pre-diversion)
3.4.15. Whangaehu at Karioi (sim natural) (331070), Jul-1979 to Jul-2003 (post-diversion)
3.4.16. Whangaehu at Kauangaroa (33101), Jul-1971 to Jul-2004 (all data)
3.4.17. Whangaehu at Kauangaroa (33101), Jul-1971 to Jul-1978 (pre-diversion)
3.4.18. Whangaehu at Kauangaroa (33101), Jul-1979 to Jul-2004 (post-diversion)
3.4.19. Whangaehu at Kauangaroa (sim natural) (331010), Jul-1971 to Jul-1994 (all data)
3.4.20. Whangaehu at Kauangaroa (sim natural) (331010), Jul-1971 to Jul-1978 (pre-diversion)
3.4.21. Whangaehu at Kauangaroa (sim natural) (331010), Jul-1979 to Jul-1994 (post-div.)
Statistical analysis of river flow data in the Horizons Region 156
Figure 9: Flow sites in the Turakina and Whangaehu catchments
Statistical analysis of river flow data in the Horizons Region 157
4.4.1. Turakina at Otairi (33004), Jul-1991 to Jul-2004 (all data)
Site Turakina at Otairi
Time series Data Start Time 9-Apr-91 details Data End Time 12-Apr-05 Analysis Start time 1-Jul-91 Analysis End time 1-Jul-04 Years of record analysed13 Gaps in the data (% of record). 0.89
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 6.309 MALF 0.382 ½ median 1.0680.504 3x median 6.4053.021 MAF 208.87 Flow 0 (maximum recorded flow) 395.13 395.13 variability 10 15.1385.645 percentiles 20 7.952.8 25 (upper quartile flow) 6.0512.187 30 4.7961.799 40 3.1481.315 50 (median flow) 2.1351.007 60 1.50.789 70 1.0390.614 75 (lower quartile flow) 0.8690.538 80 0.7310.481 90 0.4770.39 91 0.4580.383 92 0.440.377 93 0.4230.371 94 0.4070.365 95 0.3910.354 96 0.3750.343 97 0.3590.329 98 0.3420.306 99 0.3050.249 100 (minimum recorded flow) 0.1250.125
Statistical analysis of river flow data in the Horizons Region 158
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 546.78 disturbance MAF/median 97.831 indicators FRE3 (floods/year or season) 9.6910.743 STD Annual FRE3 1.7444.393 Mean Days of Accrual (days) 26.57123.368 STD Accrual (days) 28.9223.731 Min Accrual (days) 55 Max Accrual (days) 177124
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 159
4.4.2. Turakina at SH3 Br (33003), Jul-1977 to Jul-1992 (all data)
Site Turakina at SH3 Br
Time series Data Start Time 2-Feb-77 details Data End Time 24-Jun-92 Analysis Start time 1-Jul-77 Analysis End time 1-Jul-92 Years of record analysed15 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 7.194 MALF 0.925 ½ median 1.4670.844 3x median 8.8025.061 MAF 233.48 Flow 0 (maximum recorded flow) 372.704 294.896 variability 10 15.1825.554 percentiles 20 8.2873.368 25 (upper quartile flow) 6.6512.859 30 5.4462.513 40 3.8962.012 50 (median flow) 2.9341.687 60 2.3021.498 70 1.7841.352 75 (lower quartile flow) 1.6151.267 80 1.4491.181 90 1.161.025 91 1.1281.009 92 1.0970.993 93 1.0690.977 94 1.0430.96 95 1.0150.942 96 0.9850.918 97 0.9490.875 98 0.8970.795 99 0.7970.698 100 (minimum recorded flow) 0.5120.512
Statistical analysis of river flow data in the Horizons Region 160
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 252.411 disturbance MAF/median 79.577 indicators FRE3 (floods/year or season) 9.1329.67 STD Annual FRE3 2.4723.33 Mean Days of Accrual (days) 30.97828.783 STD Accrual (days) 35.23928.504 Min Accrual (days) 55 Max Accrual (days) 215133
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 161
4.4.3. Makotuku at SH 49A Br (33117), Jul-1968 to Jul-2005 (all data)
Site Makotuku at SH 49A Br
Time series Data Start Time 7-Feb-68 details Data End Time 12-Jan-06 Analysis Start time 1-Jul-68 Analysis End time 1-Jul-05 Years of record analysed37 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 0.898 MALF 0.116 ½ median 0.2230.14 3x median 1.3380.837 MAF 34.662 Flow 0 (maximum recorded flow) 83.825 83.825 variability 10 1.8811.173 percentiles 20 1.1180.658 25 (upper quartile flow) 0.9260.54 30 0.7820.457 40 0.5790.351 50 (median flow) 0.4460.279 60 0.350.229 70 0.2690.188 75 (lower quartile flow) 0.2330.169 80 0.2060.153 90 0.1490.123 91 0.1420.121 92 0.1380.118 93 0.1320.115 94 0.1260.113 95 0.1230.111 96 0.1170.108 97 0.1120.105 98 0.1070.101 99 0.1010.098 100 (minimum recorded flow) 0.0670.067
Statistical analysis of river flow data in the Horizons Region 162
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 298.81 disturbance MAF/median 77.717 indicators FRE3 (floods/year or season) 14.67614.16 STD Annual FRE3 2.6663.952 Mean Days of Accrual (days) 19.04819.122 STD Accrual (days) 17.58317.369 Min Accrual (days) 55 Max Accrual (days) 122109
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 163
4.4.4. Mangaetoroa at School (33115), Jul-1969 to Jul-2004 (all data)
Site Mangaetoroa at School
Time series Data Start Time 30-Dec-68 details Data End Time 8-Apr-05 Analysis Start time 1-Jul-69 Analysis End time 1-Jul-04 Years of record analysed35 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 0.928 MALF 0.184 ½ median 0.2690.173 3x median 1.6111.038 MAF 20.564 Flow 0 (maximum recorded flow) 48.165 48.165 variability 10 1.9461.149 percentiles 20 1.1880.688 25 (upper quartile flow) 1.0070.579 30 0.8710.506 40 0.6720.412 50 (median flow) 0.5370.346 60 0.4350.3 70 0.3520.259 75 (lower quartile flow) 0.3160.24 80 0.2820.223 90 0.2180.187 91 0.2110.184 92 0.2050.18 93 0.1990.177 94 0.1920.172 95 0.1850.168 96 0.1780.162 97 0.1710.153 98 0.1610.144 99 0.1440.134 100 (minimum recorded flow) 0.1170.117
Statistical analysis of river flow data in the Horizons Region 164
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 111.761 disturbance MAF/median 38.294 indicators FRE3 (floods/year or season) 12.39911.974 STD Annual FRE3 2.6684.312 Mean Days of Accrual (days) 24.24123.667 STD Accrual (days) 24.83422.254 Min Accrual (days) 55 Max Accrual (days) 200148
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 165
4.4.5. Mangawhero at Ohakune All (600), Jul-1975 to Jul-2005 (all data)
Site Mangawhero at Ohakune All
Time series Data Start Time 15-Apr-75 details Data End Time 4-Aug-05 Analysis Start time 1-Jul-75 Analysis End time 1-Jul-05 Years of record analysed30 Gaps in the data (% of record). 57.53
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 2.896 MALF 0.748 ½ median 0.930.672 3x median 5.5774.029 MAF 64.601 Flow 0 (maximum recorded flow) 122.416 87.67 variability 10 5.5343.661 percentiles 20 3.62.373 25 (upper quartile flow) 3.0912.078 30 2.7361.857 40 2.2411.557 50 (median flow) 1.8591.343 60 1.5421.177 70 1.271.022 75 (lower quartile flow) 1.1640.961 80 1.0580.902 90 0.8730.801 91 0.8580.795 92 0.8380.783 93 0.8210.772 94 0.7990.763 95 0.7860.753 96 0.7690.743 97 0.7510.732 98 0.7340.721 99 0.7140.705 100 (minimum recorded flow) 0.580.58
Statistical analysis of river flow data in the Horizons Region 166
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 86.365 disturbance MAF/median 34.75 indicators FRE3 (floods/year or season) 12.16210.573 STD Annual FRE3 3.2043.104 Mean Days of Accrual (days) 25.67325.917 STD Accrual (days) 26.60526.535 Min Accrual (days) 55 Max Accrual (days) 156125
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 167
4.4.6. Mangawhero at Ore Ore (33111), Jul-1962 to Jul-2004 (all data)
Site Mangawhero at Ore Ore
Time series Data Start Time 7-May-62 details Data End Time 8-Apr-05 Analysis Start time 1-Jul-62 Analysis End time 1-Jul-04 Years of record analysed42 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 13.982 MALF 2.803 ½ median 4.2062.687 3x median 25.23316.119 MAF 231.7 Flow 0 (maximum recorded flow) 701.195 701.195 variability 10 29.35717.022 percentiles 20 18.47510.631 25 (upper quartile flow) 15.7159.072 30 13.6867.911 40 10.5876.354 50 (median flow) 8.4115.373 60 6.7274.609 70 5.4263.984 75 (lower quartile flow) 4.8773.704 80 4.3623.425 90 3.3532.867 91 3.2522.804 92 3.1492.744 93 3.0372.686 94 2.9332.624 95 2.8172.556 96 2.7012.477 97 2.5852.375 98 2.4442.204 99 2.1631.906 100 (minimum recorded flow) 1.3371.337
Statistical analysis of river flow data in the Horizons Region 168
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 82.661 disturbance MAF/median 27.547 indicators FRE3 (floods/year or season) 11.14210.505 STD Annual FRE3 2.444.086 Mean Days of Accrual (days) 27.37326.932 STD Accrual (days) 31.64626.852 Min Accrual (days) 55 Max Accrual (days) 249149
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 169
4.4.7. Tokiahuru at Whangaehu Junction (33112), Jul-1980 to Jul-1993 (post-diversion)
Site Tokiahuru at Whangaehu Junction
Time series Data Start Time 13-Aug-79 details Data End Time 12-Jan-94 Analysis Start time 1-Jul-80 Analysis End time 1-Jul-93 Years of record analysed13 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 7.641 MALF 4.821 ½ median 3.373.096 3x median 20.2218.573 MAF 41.552 Flow 0 (maximum recorded flow) 61.922 41.866 variability 10 10.9999.25 percentiles 20 9.2057.898 25 (upper quartile flow) 8.5687.478 30 8.0437.133 40 7.3226.588 50 (median flow) 6.746.191 60 6.2755.853 70 5.95.565 75 (lower quartile flow) 5.7225.44 80 5.5415.276 90 5.1194.965 91 5.0744.935 92 5.0224.9 93 4.9714.868 94 4.9194.829 95 4.8614.776 96 4.7994.711 97 4.7254.65 98 4.6484.556 99 4.4754.429 100 (minimum recorded flow) 4.1084.261
Statistical analysis of river flow data in the Horizons Region 170
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 8.619 disturbance MAF/median 6.165 indicators FRE3 (floods/year or season) 1.5391.551 STD Annual FRE3 1.1991.209 Mean Days of Accrual (days) 219.95101.095 STD Accrual (days) 213.23758.096 Min Accrual (days) 819 Max Accrual (days) 771181
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 171
4.4.8. Wahianoa at Karioi (33116), Jul-1968 to Jul-1972 (pre-diversion)
Site Wahianoa at Karioi
Time series Data Start Time 12-Aug-67 details Data End Time 13-Sep-72 Analysis Start time 1-Jul-68 Analysis End time 1-Jul-72 Years of record analysed4 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 0.643 MALF 0.093 ½ median 0.2260.3 3x median 1.3561.8 MAF 16.51 Flow 0 (maximum recorded flow) 26.414 26.414 variability 10 1.2111.333 percentiles 20 0.820.932 25 (upper quartile flow) 0.7290.84 30 0.6560.777 40 0.5390.677 50 (median flow) 0.4520.6 60 0.3740.518 70 0.2960.451 75 (lower quartile flow) 0.2650.416 80 0.2350.383 90 0.1750.279 91 0.1670.262 92 0.1580.246 93 0.1510.233 94 0.1450.217 95 0.1390.198 96 0.1320.181 97 0.1230.16 98 0.1150.146 99 0.1060.129 100 (minimum recorded flow) 0.0580.086
Statistical analysis of river flow data in the Horizons Region 172
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 177.527 disturbance MAF/median 36.527 indicators FRE3 (floods/year or season) 11.510.572 STD Annual FRE3 2.5164.438 Mean Days of Accrual (days) 27.28926.826 STD Accrual (days) 27.25122.91 Min Accrual (days) 55 Max Accrual (days) 11289
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 173
4.4.9. Waitangi at Tangiwai (33114), Jul-1968 to Jul-1991 (all data)
Site Waitangi at Tangiwai
Time series Data Start Time 22-Nov-67 details Data End Time 2-Apr-92 Analysis Start time 1-Jul-68 Analysis End time 1-Jul-91 Years of record analysed23 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 1.009 MALF 0.526 ½ median 0.4310.353 3x median 2.5862.118 MAF 3.432 Flow 0 (maximum recorded flow) 5.767 5.767 variability 10 1.6691.09 percentiles 20 1.3130.929 25 (upper quartile flow) 1.2010.875 30 1.1160.831 40 0.9730.763 50 (median flow) 0.8620.706 60 0.7710.663 70 0.6940.623 75 (lower quartile flow) 0.6630.601 80 0.6340.582 90 0.5660.531 91 0.5570.528 92 0.5490.521 93 0.5420.519 94 0.5320.51 95 0.5270.5 96 0.5180.483 97 0.50.464 98 0.470.445 99 0.4410.426 100 (minimum recorded flow) 0.330.33
Statistical analysis of river flow data in the Horizons Region 174
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 6.525 disturbance MAF/median 3.981 indicators FRE3 (floods/year or season) 1.4351.05 STD Annual FRE3 1.6741.808 Mean Days of Accrual (days) 219.849123.576 STD Accrual (days) 283.52663.506 Min Accrual (days) 516 Max Accrual (days) 1114181
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 175
4.4.10. Whangaehu at Karioi (33107), Jul-1963 to Jul-2003 (all data)
Site Whangaehu at Karioi
Time series Data Start Time 1-Nov-62 details Data End Time 6-Apr-04 Analysis Start time 1-Jul-63 Analysis End time 1-Jul-03 Years of record analysed40 Gaps in the data (% of record). 8.15
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 14.202 MALF 8.975 ½ median 6.486.12 3x median 38.87736.72 MAF 94.286 Flow 0 (maximum recorded flow) 238.25 132.021 variability 10 20.81118.783 percentiles 20 17.63415.984 25 (upper quartile flow) 16.56515.036 30 15.61414.273 40 14.11513.158 50 (median flow) 12.95912.24 60 11.96711.347 70 10.94910.413 75 (lower quartile flow) 10.4299.972 80 9.9539.527 90 8.8558.603 91 8.7168.492 92 8.5758.389 93 8.4268.276 94 8.2678.161 95 8.1018.044 96 7.9277.921 97 7.7017.694 98 7.0827.199 99 0.3940.554 100 (minimum recorded flow) 0.0580.174
Statistical analysis of river flow data in the Horizons Region 176
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 10.446 disturbance MAF/median 7.276 indicators FRE3 (floods/year or season) 1.51.847 STD Annual FRE3 1.1091.824 Mean Days of Accrual (days) 21394.985 STD Accrual (days) 179.64760.916 Min Accrual (days) 65 Max Accrual (days) 786181
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 177
4.4.11. Whangaehu at Karioi (33107), Jul-1963 to Jul-1978 (pre-diversion)
Site Whangaehu at Karioi
Time series Data Start Time 1-Nov-62 details Data End Time 1-Apr-79 Analysis Start time 1-Jul-63 Analysis End time 1-Jul-78 Years of record analysed15 Gaps in the data (% of record). 21.44
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 16.139 MALF 10.771 ½ median 7.7277.241 3x median 46.36243.443 MAF 96.805 Flow 0 (maximum recorded flow) 118.631 117.766 variability 10 23.12720.888 percentiles 20 19.97218.394 25 (upper quartile flow) 18.95917.672 30 18.19716.937 40 16.8515.588 50 (median flow) 15.45414.481 60 14.25113.578 70 13.22712.763 75 (lower quartile flow) 12.74312.357 80 12.26911.901 90 10.80810.825 91 10.57510.683 92 10.34510.517 93 9.99310.359 94 7.99110.087 95 0.821.729 96 0.5110.755 97 0.3840.537 98 0.2960.417 99 0.2070.332 100 (minimum recorded flow) 0.0580.174
Statistical analysis of river flow data in the Horizons Region 178
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 10.158 disturbance MAF/median 6.264 indicators FRE3 (floods/year or season) 1.1821.098 STD Annual FRE3 0.6031.382 Mean Days of Accrual (days) 254.077116.308 STD Accrual (days) 194.98761.658 Min Accrual (days) 3832 Max Accrual (days) 656181
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 179
4.4.12. Whangaehu at Karioi (33107), Jul-1979 to Jul-2003 (post-diversion)
Site Whangaehu at Karioi
Time series Data Start Time 1-Apr-79 details Data End Time 6-Apr-04 Analysis Start time 1-Jul-79 Analysis End time 1-Jul-03 Years of record analysed24 Gaps in the data (% of record). 0.18
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 13.203 MALF 8.244 ½ median 5.8735.5 3x median 35.23833 MAF 92.437 Flow 0 (maximum recorded flow) 238.25 132.021 variability 10 18.90116.637 percentiles 20 15.80914.107 25 (upper quartile flow) 14.82913.388 30 14.02112.812 40 12.75511.875 50 (median flow) 11.74611 60 10.88810.267 70 10.1459.636 75 (lower quartile flow) 9.7939.368 80 9.4639.077 90 8.6588.418 91 8.5598.347 92 8.468.272 93 8.3578.193 94 8.2478.117 95 8.1368.046 96 8.0227.966 97 7.8997.87 98 7.7587.708 99 7.5087.419 100 (minimum recorded flow) 6.6766.876
Statistical analysis of river flow data in the Horizons Region 180
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 11.243 disturbance MAF/median 7.87 indicators FRE3 (floods/year or season) 1.8331.931 STD Annual FRE3 1.4041.512 Mean Days of Accrual (days) 177.56190.556 STD Accrual (days) 158.16763.873 Min Accrual (days) 55 Max Accrual (days) 771181
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 181
4.4.13. Whangaehu at Karioi (sim natural) (331070), Jul-1963 to Jul-2003 (all data)
Site Whangaehu at Karioi (sim natural)
Time series Data Start Time 1-Nov-62 details Data End Time 4-Jul-03 Analysis Start time 1-Jul-63 Analysis End time 1-Jul-03 Years of record analysed40 Gaps in the data (% of record). 9.88
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 16.657 MALF 10.879 ½ median 7.637.233 3x median 45.77743.398 MAF 89.663 Flow 0 (maximum recorded flow) 171.357 128.475 variability 10 22.73920.501 percentiles 20 19.55317.987 25 (upper quartile flow) 18.55817.235 30 17.76816.551 40 16.41315.476 50 (median flow) 15.25914.466 60 14.23113.621 70 13.36212.871 75 (lower quartile flow) 12.95312.503 80 12.54212.15 90 11.63311.34 91 11.52211.237 92 11.39611.136 93 11.26111.033 94 11.1210.937 95 10.98510.829 96 10.83510.716 97 10.67510.57 98 10.47110.381 99 10.22210.136 100 (minimum recorded flow) 8.8528.852
Statistical analysis of river flow data in the Horizons Region 182
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 8.267 disturbance MAF/median 5.876 indicators FRE3 (floods/year or season) 1.0270.952 STD Annual FRE3 1.0811.318 Mean Days of Accrual (days) 325.606122.531 STD Accrual (days) 348.05564.503 Min Accrual (days) 65 Max Accrual (days) 1322181
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 183
4.4.14. Whangaehu at Karioi (sim natural) (331070), Jul-1963 to Jul-1978 (pre-diversion)
Site Whangaehuat Karioi (sim natural)
Time series Data Start Time 1-Nov-62 details Data End Time 1-Apr-79 Analysis Start time 1-Jul-63 Analysis End time 1-Jul-78 Years of record analysed15 Gaps in the data (% of record). 26.05
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 17.131 MALF 10.75 ½ median 7.9347.372 3x median 47.60444.229 MAF 91.504 Flow 0 (maximum recorded flow) 112.505 112.505 variability 10 23.41921.1 percentiles 20 20.28518.555 25 (upper quartile flow) 19.23717.87 30 18.44917.181 40 17.17715.86 50 (median flow) 15.86814.743 60 14.60713.83 70 13.6413.079 75 (lower quartile flow) 13.17712.682 80 12.72412.303 90 11.79111.427 91 11.65211.34 92 11.51411.236 93 11.3711.119 94 11.23311.005 95 11.06710.825 96 10.8510.696 97 10.63510.544 98 10.4110.376 99 10.23710.202 100 (minimum recorded flow) 9.5369.84
Statistical analysis of river flow data in the Horizons Region 184
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 8.537 disturbance MAF/median 5.767 indicators FRE3 (floods/year or season) 1.2720.914 STD Annual FRE3 1.1021.382 Mean Days of Accrual (days) 269126.083 STD Accrual (days) 196.19462.355 Min Accrual (days) 3832 Max Accrual (days) 657181
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 185
4.4.15. Whangaehu at Karioi (sim natural) (331070), Jul-1979 to Jul-2003 (post-diversion)
Site Whangaehu at Karioi (sim natural)
Time series Data Start Time 1-Apr-79 details Data End Time 4-Jul-03 Analysis Start time 1-Jul-79 Analysis End time 1-Jul-03 Years of record analysed24 Gaps in the data (% of record). 0.19
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 16.494 MALF 10.96 ½ median 7.5597.204 3x median 45.35443.224 MAF 87.696 Flow 0 (maximum recorded flow) 171.357 128.475 variability 10 22.47320.24 percentiles 20 19.29117.711 25 (upper quartile flow) 18.29417.003 30 17.49616.391 40 16.20915.401 50 (median flow) 15.11814.408 60 14.13213.565 70 13.29412.797 75 (lower quartile flow) 12.88912.441 80 12.48812.094 90 11.57111.287 91 11.45711.187 92 11.3311.092 93 11.19711.002 94 11.06510.916 95 10.94810.827 96 10.82110.722 97 10.67910.58 98 10.49710.377 99 10.20210.104 100 (minimum recorded flow) 8.8528.852
Statistical analysis of river flow data in the Horizons Region 186
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 8.029 disturbance MAF/median 5.801 indicators FRE3 (floods/year or season) 10.924 STD Annual FRE3 1.1031.327 Mean Days of Accrual (days) 341.714122.758 STD Accrual (days) 383.62264.432 Min Accrual (days) 65 Max Accrual (days) 1263181
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 187
4.4.16. Whangaehu at Kauangaroa (33101), Jul-1971 to Jul-2004 (all data)
Site Whangaehu at Kauangaroa
Time series Data Start Time 18-Jun-71 details Data End Time 15-Jun-04 Analysis Start time 1-Jul-71 Analysis End time 1-Jul-04 Years of record analysed33 Gaps in the data (% of record). 0
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 39.896 MALF 13.647 ½ median 13.5810.413 3x median 81.4862.478 MAF 459.84 Flow 0 (maximum recorded flow) 1195.9 1195.9 variability 10 75.38246.205 percentiles 20 50.93332.388 25 (upper quartile flow) 44.39729.215 30 39.42726.905 40 32.21623.334 50 (median flow) 27.1620.826 60 23.30118.983 70 20.28517.389 75 (lower quartile flow) 19.01516.619 80 17.83215.79 90 15.313.986 91 15.00413.831 92 14.69213.671 93 14.36913.485 94 14.05513.295 95 13.77713.075 96 13.47412.859 97 13.0912.525 98 12.64212.113 99 11.91411.564 100 (minimum recorded flow) 10.18410.184
Statistical analysis of river flow data in the Horizons Region 188
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 33.695 disturbance MAF/median 16.931 indicators FRE3 (floods/year or season) 9.157.079 STD Annual FRE3 2.4353.832 Mean Days of Accrual (days) 35.34840.811 STD Accrual (days) 39.40440.342 Min Accrual (days) 55 Max Accrual (days) 237184
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 189
4.4.17. Whangaehu at Kauangaroa (33101), Jul-1971 to Jul-1978 (pre-diversion)
Site Whangaehu at Kauangaroa
Time series Data Start Time 18-Jun-71 details Data End Time 1-Apr-79 Analysis Start time 1-Jul-71 Analysis End time 1-Jul-78 Years of record analysed7 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 41.645 MALF 14.174 ½ median 14.30110.575 3x median 85.80363.447 MAF 483.34 Flow 0 (maximum recorded flow) 639.85 481.802 variability 10 78.54740.165 percentiles 20 52.59230.363 25 (upper quartile flow) 45.77828.373 30 41.08626.425 40 33.90623.399 50 (median flow) 28.60121.149 60 24.35519.561 70 20.87218.244 75 (lower quartile flow) 19.57717.499 80 18.48316.826 90 16.12114.811 91 15.77514.409 92 15.49614.122 93 15.21213.998 94 14.73813.867 95 14.29413.764 96 13.96813.559 97 13.72213.256 98 13.25512.953 99 12.27612.21 100 (minimum recorded flow) 11.32811.73
Statistical analysis of river flow data in the Horizons Region 190
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 34.1 disturbance MAF/median 16.899 indicators FRE3 (floods/year or season) 8.2834.888 STD Annual FRE3 3.4933.452 Mean Days of Accrual (days) 3863.4 STD Accrual (days) 49.43751.986 Min Accrual (days) 55 Max Accrual (days) 237184
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 191
4.4.18. Whangaehu at Kauangaroa (33101), Jul-1979 to Jul-2004 (post-diversion)
Site Whangaehu at Kauangaroa
Time series Data Start Time 1-Apr-79 details Data End Time 15-Jun-04 Analysis Start time 1-Jul-79 Analysis End time 1-Jul-04 Years of record analysed25 Gaps in the data (% of record). 0
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 39.387 MALF 13.48 ½ median 13.36110.369 3x median 80.16662.211 MAF 463.21 Flow 0 (maximum recorded flow) 1195.9 1195.9 variability 10 74.42548.118 percentiles 20 50.4133.066 25 (upper quartile flow) 43.85229.569 30 38.95227.025 40 31.73423.323 50 (median flow) 26.72220.737 60 23.01718.756 70 20.08817.069 75 (lower quartile flow) 18.79116.287 80 17.58715.456 90 15.01413.779 91 14.73413.629 92 14.43513.458 93 14.13213.288 94 13.86613.08 95 13.57612.896 96 13.26812.677 97 12.91612.31 98 12.47611.87 99 11.71811.381 100 (minimum recorded flow) 10.18410.184
Statistical analysis of river flow data in the Horizons Region 192
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 34.363 disturbance MAF/median 17.334 indicators FRE3 (floods/year or season) 9.4397.572 STD Annual FRE3 2.1983.817 Mean Days of Accrual (days) 34.40437.722 STD Accrual (days) 37.22737.94 Min Accrual (days) 55 Max Accrual (days) 226171
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 193
4.4.19. Whangaehu at Kauangaroa (sim natural) (331010), Jul-1971 to Jul-1994 (all data)
Site Whangaehu at Kauangaroa (sim natural)
Time series Data Start Time 19-Jun-71 details Data End Time 4-Jul-94 Analysis Start time 1-Jul-71 Analysis End time 1-Jul-94 Years of record analysed23 Gaps in the data (% of record). 0.02
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 41.204 MALF 14.711 ½ median 14.60211.251 3x median 87.60967.503 MAF 435.37 Flow 0 (maximum recorded flow) 635.112 479.585 variability 10 76.30244.877 percentiles 20 52.67933.184 25 (upper quartile flow) 45.95530.394 30 41.11928.29 40 34.10424.969 50 (median flow) 29.20322.501 60 25.43620.805 70 22.24819.234 75 (lower quartile flow) 21.0518.466 80 19.89517.686 90 17.30915.652 91 16.92215.432 92 16.56715.187 93 16.2414.972 94 15.84814.73 95 15.45114.504 96 15.02714.235 97 14.63413.923 98 14.09813.597 99 13.43512.98 100 (minimum recorded flow) 10.27210.272
Statistical analysis of river flow data in the Horizons Region 194
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 29.595 disturbance MAF/median 14.908 indicators FRE3 (floods/year or season) 8.2166.044 STD Annual FRE3 2.4083.097 Mean Days of Accrual (days) 39.92647.425 STD Accrual (days) 45.13643.647 Min Accrual (days) 55 Max Accrual (days) 237184
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 195
4.4.20. Whangaehu at Kauangaroa (sim natural) (331010), Jul-1971 to Jul-1978 (pre-diversion)
Site Whangaehu at Kauangaroa (sim natural)
Time series Data Start Time 19-Jun-71 details Data End Time 1-Apr-79 Analysis Start time 1-Jul-71 Analysis End time 1-Jul-78 Years of record analysed7 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 42.985 MALF 14.39 ½ median 15.14110.689 3x median 90.84364.134 MAF 476.35 Flow 0 (maximum recorded flow) 634.147 479.585 variability 10 81.08143.069 percentiles 20 55.4431.281 25 (upper quartile flow) 48.63428.92 30 43.77927.03 40 35.72623.734 50 (median flow) 30.28121.378 60 25.61419.724 70 21.58818.439 75 (lower quartile flow) 20.25117.871 80 19.06216.987 90 16.6514.78 91 16.3714.684 92 15.91814.531 93 15.53814.324 94 15.11513.95 95 14.79413.651 96 14.53813.414 97 13.9713.107 98 13.41712.577 99 12.56511.456 100 (minimum recorded flow) 10.87910.879
Statistical analysis of river flow data in the Horizons Region 196
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 33.103 disturbance MAF/median 15.731 indicators FRE3 (floods/year or season) 7.9964.601 STD Annual FRE3 3.9093.008 Mean Days of Accrual (days) 36.98266.474 STD Accrual (days) 49.28451.51 Min Accrual (days) 59 Max Accrual (days) 237184
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 197
4.4.21. Whangaehu at Kauangaroa (sim natural) (331010), Jul-1979 to Jul-1994 (post-diversion)
Site Whangaehu at Kauangaroa (sim natural)
Time series Data Start Time 1-Apr-79 details Data End Time 4-Jul-94 Analysis Start time 1-Jul-79 Analysis End time 1-Jul-94 Years of record analysed15 Gaps in the data (% of record). 0.03
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 40.27 MALF 14.855 ½ median 14.33211.452 3x median 85.98968.712 MAF 423.54 Flow 0 (maximum recorded flow) 635.112 467.868 variability 10 73.68645.139 percentiles 20 50.93333.59 25 (upper quartile flow) 44.52730.867 30 39.77228.694 40 33.24125.37 50 (median flow) 28.66322.904 60 25.3121.168 70 22.40619.655 75 (lower quartile flow) 21.26418.822 80 20.17117.898 90 17.43315.901 91 17.10215.693 92 16.72515.502 93 16.38215.302 94 16.04615.07 95 15.65514.835 96 15.27214.499 97 14.86314.237 98 14.30513.968 99 13.79713.658 100 (minimum recorded flow) 10.27210.272
Statistical analysis of river flow data in the Horizons Region 198
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 28.512 disturbance MAF/median 14.777 indicators FRE3 (floods/year or season) 8.3326.715 STD Annual FRE3 2.0222.915 Mean Days of Accrual (days) 39.95243.71 STD Accrual (days) 43.77241.369 Min Accrual (days) 55 Max Accrual (days) 226171
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 199
4.5. Whanganui Catchments and Kai Iwi
The list below shows: section number in this report, site name, (site number) and full date range. The analysis date range is from the first July after the start date until the last June before the finish date.
3.5.1. Manganui-o-te-ao at Ashworth (33309), Jul-1962 to Jul-1980 (all data)
3.5.2. Mangaroa at Ohura Town Br (33341), Jul-1965 to Jul-1970 (all data)
3.5.3. Ohura at Tokorima (33313), Jul-1962 to Jul-2005 (all data)
3.5.4. Ongarue at Taringamotu (33316), Jul-1963 to Jul-2004 (all data)
3.5.5. Tangarakau at Tangarakau (33311), Jul-1962 to Jul-1968 (all data)
3.5.6. Whakapapa at Footbridge (33320), Jul-1960 to Jul-2000 (all data)
3.5.7. Whakapapa at Footbridge (33320), Jul-1960 to Jul-1972 (pre-diversion)
3.5.8. Whakapapa at Footbridge (33320), Jul-1973 to Jul-1983 (1972 rules)
3.5.9. Whakapapa at Footbridge (33320), Jul-1984 to Jul-1992 (1983 rules)
3.5.10. Whakapapa at Footbridge (33320), Jul-1993 to Jul-2000 (Planning Tribunal 1990)
3.5.11. Whakapapa at Footbridge (sim natural) (333001), Jul-1960 to Jul-2003 (all data)
3.5.12. Whakapapa at Footbridge (sim natural) (333001), Jul-1960 to Jul-1972 (pre-diversion)
3.5.13. Whakapapa at Footbridge (sim natural) (333001), Jul-1973 to Jul-1983 (1972 rules)
3.5.14. Whakapapa at Footbridge (sim natural) (333001), Jul-1984 to Jul-1992 (1983 rules)
3.5.15. Whakapapa at Footbridge (sim nat.) (333001), Jul-1993 to Jul-2003 (Plan. Trib. 1990)
3.5.16. Whakapapa at Footbridge (sim consent) (8005), Jul-1962 to Jul-2003 (all data)
3.5.17. Whakapapa at Footbridge (sim consent) (8005), Jul-1962 to Jul-1972 (pre-diversion)
3.5.18. Whakapapa at Footbridge (sim consent) (8005), Jul-1973 to Jul-1983 (1972 rules)
3.5.19. Whakapapa at Footbridge (sim consent) (8005), Jul-1984 to Jul-1992 (1983 rules)
3.5.20. Whakapapa at Footbridge (sim consent) (8005), Jul-1993 to Jul-2003 (Plan. Trib. 1990)
3.5.21. Whanganui at Matapuna (33338), Jul-1964 to Jul-1972 (pre-diversion)
3.5.22. Whanganui at Paetawa (33301), Jul-1957 to Jul-2004 (all data)
3.5.23. Whanganui at Paetawa (33301), Jul-1957 to Jul-1972 (pre-diversion)
Statistical analysis of river flow data in the Horizons Region 200
3.5.24. Whanganui at Paetawa (33301), Jul-1973 to Jul-1983 (1972 rules)
3.5.25. Whanganui at Paetawa (33301), Jul-1984 to Jul-1992 (1983 rules)
3.5.26. Whanganui at Paetawa (33301), Jul-1993 to Jul-2004 (Planning Tribunal 1990)
3.5.27. Whanganui at Paetawa (sim natural) (333005), Jul-1951 to Jul-2003 (all data)
3.5.28. Whanganui at Paetawa (sim natural) (333005), Jul-1951 to Jul-1972 (pre-diversion)
3.5.29. Whanganui at Paetawa (sim natural) (333005), Jul-1973 to Jul-1983 (1972 rules)
3.5.30. Whanganui at Paetawa (sim natural) (333005), Jul-1984 to Jul-1992 (1983 rules)
3.5.31. Whanganui at Paetawa (sim natural) (333005), Jul-1993 to Jul-2003 (Plan. Trib. 1990)
3.5.32. Whanganui at Paetawa (sim consent) (8005), Jul-1962 to Jul-2003 (all data)
3.5.33. Whanganui at Paetawa (sim consent) (8005), Jul-1962 to Jul-1972 (pre-diversion)
3.5.34. Whanganui at Paetawa (sim consent) (8005), Jul-1973 to Jul-1983 (1972 rules)
3.5.35. Whanganui at Paetawa (sim consent) (8005), Jul-1984 to Jul-1992 (1983 rules)
3.5.36. Whanganui at Paetawa (sim consent) (8005), Jul-1993 to Jul-2003 (Plan. Trib. 1990)
3.5.37. Whanganui at Piriaka (33356), Jul-1971 to Jul-2003 (all data)
3.5.38. Whanganui at Piriaka (33356), Jul-1973 to Jul-1983 (1972 rules)
3.5.39. Whanganui at Piriaka (33356), Jul-1984 to Jul-1992 (1983 rules)
3.5.40. Whanganui at Piriaka (33356), Jul-1993 to Jul-2003 (Planning Tribunal 1990)
3.5.41. Whanganui at Piriaka (sim natural) (33300), Jul-1964 to Jul-2003 (all data)
3.5.42. Whanganui at Piriaka (sim natural) (33300), Jul-1964 to Jul-1972 (pre-diversion)
3.5.43. Whanganui at Piriaka (sim natural) (33300), Jul-1973 to Jul-1983 (1972 rules)
3.5.44. Whanganui at Piriaka (sim natural) (33300), Jul-1984 to Jul-1992 (1983 rules)
3.5.45. Whanganui at Piriaka (sim natural) (33300), Jul-1993 to Jul-2003 (Plan. Trib. 1990)
3.5.46. Whanganui at Piriaka (sim consent) (8005), Jul-1964 to Jul-2003 (all data)
3.5.47. Whanganui at Piriaka (sim consent) (8005), Jul-1964 to Jul-1972 (pre-diversion)
3.5.48. Whanganui at Piriaka (sim consent) (8005), Jul-1973 to Jul-1983 (1972 rules)
3.5.49. Whanganui at Piriaka (sim consent) (8005), Jul-1984 to Jul-1992 (1983 rules)
3.5.50. Whanganui at Piriaka (sim consent) (8005), Jul-1993 to Jul-2003 (Plan. Trib. 1990)
Statistical analysis of river flow data in the Horizons Region 201
3.5.51. Whanganui at Te Maire (33302), Jul-1962 to Jul-2004 (all data)
3.5.52. Whanganui at Te Maire (33302), Jul-1962 to Jul-1972 (pre-diversion)
3.5.53. Whanganui at Te Maire (33302), Jul-1973 to Jul-1983 (1972 rules)
3.5.54. Whanganui at Te Maire (33302), Jul-1984 to Jul-1992 (1983 rules)
3.5.55. Whanganui at Te Maire (33302), Jul-1993 to Jul-2004 (Planning Tribunal 1990)
3.5.56. Whanganui at Te Maire (sim natural) (33300), Jul-1962 to Jul-2003 (all data)
3.5.57. Whanganui at Te Maire (sim natural) (33300), Jul-1962 to Jul-1972 (pre-diversion)
3.5.58. Whanganui at Te Maire (sim natural) (33300), Jul-1973 to Jul-1983 (1972 rules)
3.5.59. Whanganui at Te Maire (sim natural) (33300), Jul-1984 to Jul-1992 (1983 rules)
3.5.60. Whanganui at Te Maire (sim natural) (33300), Jul-1993 to Jul-2003 (Plan. Trib. 1990)
3.5.61. Whanganui at Te Maire (sim consent) (8005), Jul-1962 to Jul-2003 (all data)
3.5.62. Whanganui at Te Maire (sim consent) (8005), Jul-1962 to Jul-1972 (pre-diversion)
3.5.63. Whanganui at Te Maire (sim consent) (8005), Jul-1973 to Jul-1983 (1972 rules)
3.5.64. Whanganui at Te Maire (sim consent) (8005), Jul-1984 to Jul-1992 (1983 rules)
3.5.65. Whanganui at Te Maire (sim consent) (8005), Jul-1993 to Jul-2003 (Plan. Trib. 1990)
3.5.66. Whanganui at Te Porere (33347), Jul-1966 to Jul-2001 (all data)
3.5.67. Kai Iwi at Handley Rd (33502), Jul-1978 to Jul-2004 (all data)
Statistical analysis of river flow data in the Horizons Region 202
Figure 10: Flow sites in the Whanganui and Kai Iwi catchments
Statistical analysis of river flow data in the Horizons Region 203
4.5.1. Manganui-o-te-ao at Ashworth (33309), Jul-1962 to Jul-1980 (all data)
Site Manganui-o-te-ao at Ashworth
Time series Data Start Time 16-Aug-61 details Data End Time 7-Aug-80 Analysis Start time 1-Jul-62 Analysis End time 1-Jul-80 Years of record analysed18 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 18.29 MALF 4.389 ½ median 5.7584.184 3x median 34.54525.101 MAF 336.22 Flow 0 (maximum recorded flow) 478.856 478.856 variability 10 35.55725.956 percentiles 20 23.13216.531 25 (upper quartile flow) 20.01413.998 30 17.58512.196 40 14.0999.919 50 (median flow) 11.5158.367 60 9.597.162 70 7.996.238 75 (lower quartile flow) 7.275.736 80 6.6255.347 90 5.2394.481 91 5.0934.404 92 4.9434.333 93 4.7674.258 94 4.5824.194 95 4.4254.118 96 4.2844.032 97 4.1563.904 98 3.9983.756 99 3.7493.492 100 (minimum recorded flow) 3.0963.096
Statistical analysis of river flow data in the Horizons Region 204
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 76.605 disturbance MAF/median 29.198 indicators FRE3 (floods/year or season) 14.21912.198 STD Annual FRE3 3.7575.232 Mean Days of Accrual (days) 21.86323.658 STD Accrual (days) 21.4124.007 Min Accrual (days) 55 Max Accrual (days) 146140
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 205
4.5.2. Mangaroa at Ohura Town Br (33341), Jul-1965 to Jul-1970 (all data)
Site Mangaroa at Ohura Town Br
Time series Data Start Time 9-May-65 details Data End Time 18-Mar-71 Analysis Start time 1-Jul-65 Analysis End time 1-Jul-70 Years of record analysed5 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 7.717 MALF 0.501 ½ median 1.5690.918 3x median 9.4145.505 MAF 126.24 Flow 0 (maximum recorded flow) 165.026 165.026 variability 10 18.38912.755 percentiles 20 9.7935.871 25 (upper quartile flow) 7.6324.593 30 6.0663.629 40 4.2882.439 50 (median flow) 3.1381.835 60 2.3981.388 70 1.8381.074 75 (lower quartile flow) 1.5780.945 80 1.2980.808 90 0.80.518 91 0.7540.476 92 0.6960.439 93 0.6420.402 94 0.5860.355 95 0.520.3 96 0.4420.25 97 0.3570.224 98 0.2470.2 99 0.1990.179 100 (minimum recorded flow) 0.1590.159
Statistical analysis of river flow data in the Horizons Region 206
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 251.976 disturbance MAF/median 40.229 indicators FRE3 (floods/year or season) 17.20414.917 STD Annual FRE3 3.5736.786 Mean Days of Accrual (days) 15.56517.351 STD Accrual (days) 14.20218.636 Min Accrual (days) 55 Max Accrual (days) 9695
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 207
4.5.3. Ohura at Tokorima (33313), Jul-1962 to Jul-2005 (all data)
Site Ohura at Tokorima
Time series Data Start Time 7-Sep-61 details Data End Time 17-Oct-05 Analysis Start time 1-Jul-62 Analysis End time 1-Jul-05 Years of record analysed43 Gaps in the data (% of record). 52.99
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 23.797 MALF 1.064 ½ median 5.952.555 3x median 35.715.33 MAF 278.61 Flow 0 (maximum recorded flow) 413.834 413.834 variability 10 60.28532.222 percentiles 20 34.30116.683 25 (upper quartile flow) 27.99213.214 30 23.30410.623 40 16.5057.221 50 (median flow) 11.95.11 60 8.3593.701 70 5.4862.656 75 (lower quartile flow) 4.3382.238 80 3.3371.807 90 1.7390.985 91 1.570.92 92 1.390.845 93 1.2260.785 94 1.1050.719 95 0.9870.641 96 0.8560.547 97 0.7250.49 98 0.5570.424 99 0.4240.339 100 (minimum recorded flow) 0.1760.176
Statistical analysis of river flow data in the Horizons Region 208
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 261.852 disturbance MAF/median 23.413 indicators FRE3 (floods/year or season) 11.410.478 STD Annual FRE3 2.7234.117 Mean Days of Accrual (days) 24.45924.8 STD Accrual (days) 31.23525.592 Min Accrual (days) 55 Max Accrual (days) 234124
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 209
4.5.4. Ongarue at Taringamotu (33316), Jul-1963 to Jul-2004 (all data)
Site Ongarue at Taringamotu
Time series Data Start Time 5-Aug-62 details Data End Time 1-Jul-04 Analysis Start time 1-Jul-63 Analysis End time 1-Jul-04 Years of record analysed41 Gaps in the data (% of record). None
Season1 July to 30 June1Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 35.046 MALF 8.251 ½ median 12.278.503 3x median 73.6251.015 MAF 292.66 Flow 0 (maximum recorded flow) 554.134 449.049 variability 10 70.34143.153 percentiles 20 48.50829.766 25 (upper quartile flow) 42.15726.374 30 37.30223.73 40 29.97319.738 50 (median flow) 24.5417.005 60 20.25314.499 70 16.80312.322 75 (lower quartile flow) 15.11811.281 80 13.41310.308 90 9.9538.354 91 9.5768.132 92 9.267.875 93 8.9137.572 94 8.497.279 95 8.0797.003 96 7.5736.629 97 7.0676.241 98 6.4335.806 99 5.7625.367 100 (minimum recorded flow) 4.4164.416
Statistical analysis of river flow data in the Horizons Region 210
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 35.47 disturbance MAF/median 11.926 indicators FRE3 (floods/year or season) 7.1456.583 STD Annual FRE3 2.3594 Mean Days of Accrual (days) 45.30140.91 STD Accrual (days) 50.71840.89 Min Accrual (days) 55 Max Accrual (days) 324180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 211
4.5.5. Tangarakau at Tangarakau (33311), Jul-1962 to Jul-1968 (all data)
Site Tangarakau at Tangarakau
Time series Data Start Time 7-Oct-61 details Data End Time 9-Jan-69 Analysis Start time 1-Jul-62 Analysis End time 1-Jul-68 Years of record analysed6 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 12.086 MALF 0.527 ½ median 2.6141.626 3x median 15.6819.753 MAF 255.01 Flow 0 (maximum recorded flow) 367.108 367.108 variability 10 29.8323.461 percentiles 20 16.33111.164 25 (upper quartile flow) 12.6868.302 30 10.1386.561 40 7.184.5 50 (median flow) 5.2273.251 60 3.9252.377 70 2.9241.778 75 (lower quartile flow) 2.4471.518 80 2.0081.27 90 1.1740.791 91 1.0960.742 92 0.9890.693 93 0.9080.66 94 0.840.628 95 0.7530.58 96 0.6870.527 97 0.6260.474 98 0.520.435 99 0.4290.37 100 (minimum recorded flow) 0.2740.274
Statistical analysis of river flow data in the Horizons Region 212
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 483.89 disturbance MAF/median 48.787 indicators FRE3 (floods/year or season) 15.16514.778 STD Annual FRE3 1.9543.554 Mean Days of Accrual (days) 18.27818.022 STD Accrual (days) 13.39411.667 Min Accrual (days) 55 Max Accrual (days) 6545
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 213
4.5.6. Whakapapa at Footbridge (33320), Jul-1960 to Jul-2000 (all data)
Site Whakapapa at Footbridge
Time series Data Start Time 12-Nov-59 details Data End Time 24-Apr-01 Analysis Start time 1-Jul-60 Analysis End time 1-Jul-00 Years of record analysed40 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 7.915 MALF 3.133 ½ median 1.7952.15 3x median 10.7712.9 MAF 282.93 Flow 0 (maximum recorded flow) 477.643 427.494 variability 10 16.26514.75 percentiles 20 12.02211.335 25 (upper quartile flow) 10.72710.319 30 9.7719.556 40 7.5278.204 50 (median flow) 3.594.3 60 2.6983.262 70 0.9411.483 75 (lower quartile flow) 0.860.953 80 0.80.861 90 0.6710.695 91 0.6580.68 92 0.640.665 93 0.6220.645 94 0.5980.625 95 0.5710.594 96 0.5490.555 97 0.5270.523 98 0.4990.494 99 0.450.467 100 (minimum recorded flow) 0.0050.005
Statistical analysis of river flow data in the Horizons Region 214
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 90.306 disturbance MAF/median 78.811 indicators FRE3 (floods/year or season) 9.6999.22 STD Annual FRE3 3.5094.449 Mean Days of Accrual (days) 26.68927.376 STD Accrual (days) 28.79626.65 Min Accrual (days) 55 Max Accrual (days) 204147
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 215
4.5.7. Whakapapa at Footbridge (33320), Jul-1960 to Jul-1972 (pre-diversion)
Site Whakapapa at Footbridge
Time series Data Start Time 12-Nov-59 details Data End Time 28-Nov-72 Analysis Start time 1-Jul-60 Analysis End time 1-Jul-72 Years of record analysed12 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 15.542 MALF 8.061 ½ median 6.0085.612 3x median 36.04833.669 MAF 311.43 Flow 0 (maximum recorded flow) 412.345 412.345 variability 10 23.77520.593 percentiles 20 17.07515.469 25 (upper quartile flow) 15.66914.245 30 14.5613.448 40 13.09212.335 50 (median flow) 12.01611.223 60 11.07710.426 70 10.2989.708 75 (lower quartile flow) 9.9359.355 80 9.5479.103 90 8.8398.361 91 8.7478.305 92 8.6378.193 93 8.5078.048 94 8.3767.828 95 8.2687.595 96 8.0527.396 97 7.6397.218 98 7.2616.991 99 6.7926.63 100 (minimum recorded flow) 6.2026.332
Statistical analysis of river flow data in the Horizons Region 216
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 38.634 disturbance MAF/median 25.918 indicators FRE3 (floods/year or season) 9.8338.396 STD Annual FRE3 3.3253.199 Mean Days of Accrual (days) 34.92333.22 STD Accrual (days) 34.65826.921 Min Accrual (days) 55 Max Accrual (days) 157136
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 217
4.5.8. Whakapapa at Footbridge (33320), Jul-1973 to Jul-1983 (1972 rules)
Site Whakapapa at Footbridge
Time series Data Start Time 28-Nov-72 details Data End Time 25-Dec-83 Analysis Start time 1-Jul-73 Analysis End time 1-Jul-83 Years of record analysed10 Gaps in the data (% of record).None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 3.021 MALF 0.41 ½ median 0.4510.496 3x median 2.7062.976 MAF 252.34 Flow 0 (maximum recorded flow) 402.933 402.933 variability 10 3.9467.026 percentiles 20 2.2693.305 25 (upper quartile flow) 1.6112.847 30 1.1472.295 40 0.9661.496 50 (median flow) 0.9020.992 60 0.8550.918 70 0.8130.863 75 (lower quartile flow) 0.7920.832 80 0.7670.805 90 0.6910.711 91 0.6780.698 92 0.6580.684 93 0.6340.666 94 0.6060.648 95 0.5760.615 96 0.5490.569 97 0.5110.529 98 0.4650.491 99 0.40.462 100 (minimum recorded flow) 0.0940.094
Statistical analysis of river flow data in the Horizons Region 218
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 615.463 disturbance MAF/median 279.756 indicators FRE3 (floods/year or season) 13.09912.695 STD Annual FRE3 4.5473.671 Mean Days of Accrual (days) 20.73818.884 STD Accrual (days) 17.1514.379 Min Accrual (days) 55 Max Accrual (days) 8989
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 219
4.5.9. Whakapapa at Footbridge (33320), Jul-1984 to Jul-1992 (1983 rules)
Site Whakapapa at Footbridge
Time series Data Start Time 25-Dec-83 details Data End Time 1-Sep-92 Analysis Start time 1-Jul-84 Analysis End time 1-Jul-92 Years of record analysed8 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 3.731 MALF 0.257 ½ median 0.3670.4 3x median 2.1992.4 MAF 238.68 Flow 0 (maximum recorded flow) 427.494 427.494 variability 10 9.06710.843 percentiles 20 2.4494.311 25 (upper quartile flow) 1.5452.832 30 1.0032.037 40 0.810.997 50 (median flow) 0.7330.8 60 0.6850.724 70 0.6430.668 75 (lower quartile flow) 0.6210.641 80 0.5810.606 90 0.5220.528 91 0.5170.52 92 0.5120.512 93 0.5070.504 94 0.5020.495 95 0.4960.487 96 0.4910.479 97 0.4770.471 98 0.4470.449 99 0.3620.386 100 (minimum recorded flow) 0.0250.025
Statistical analysis of river flow data in the Horizons Region 220
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 928.716 disturbance MAF/median 325.621 indicators FRE3 (floods/year or season) 1515.114 STD Annual FRE3 1.6954.033 Mean Days of Accrual (days) 16.93314.25 STD Accrual (days) 11.6919.292 Min Accrual (days) 55 Max Accrual (days) 5550
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 221
4.5.10. Whakapapa at Footbridge (33320), Jul-1993 to Jul-2000 (Planning Tribunal 1990)
Site Whakapapa at Footbridge
Time series Data Start Time 1-Sep-92 details Data End Time 24-Apr-01 Analysis Start time 1-Jul-93 Analysis End time 1-Jul-00 Years of record analysed7 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 7.226 MALF 3.023 ½ median 1.8942.583 3x median 11.36415.495 MAF 340.63 Flow 0 (maximum recorded flow) 477.643 420.122 variability 10 10.00210.289 percentiles 20 8.379.089 25 (upper quartile flow) 7.7598.654 30 6.1888.322 40 4.0597.573 50 (median flow) 3.7885.165 60 3.6143.99 70 3.4893.76 75 (lower quartile flow) 3.4333.64 80 3.3813.544 90 3.2163.403 91 3.23.378 92 3.1563.353 93 3.1163.315 94 3.0763.273 95 3.0313.249 96 3.0013.225 97 2.9723.194 98 2.9473.159 99 2.9223.019 100 (minimum recorded flow) 0.1190.119
Statistical analysis of river flow data in the Horizons Region 222
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 112.679 disturbance MAF/median 89.923 indicators FRE3 (floods/year or season) 11.4279.497 STD Annual FRE3 3.24.755 Mean Days of Accrual (days) 27.01228.316 STD Accrual (days) 23.61328.751 Min Accrual (days) 55 Max Accrual (days) 121157
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 223
4.5.11. Whakapapa at Footbridge (sim natural) (333001), Jul-1960 to Jul-2003 (all data)
Site Whakapapa at Footbridge (sim natural)
Time series Data Start Time 12-Nov-59 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-60 Analysis End time 1-Jul-03 Years of record analysed43 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 15.356 MALF 8.2 ½ median 6.2585.817 3x median 37.54534.902 MAF 237.95 Flow 0 (maximum recorded flow) 407.486 380.927 variability 10 21.3718.377 percentiles 20 16.6114.933 25 (upper quartile flow) 15.52814.17 30 14.72113.539 40 13.4912.561 50 (median flow) 12.51511.634 60 11.55710.746 70 10.65510.017 75 (lower quartile flow) 10.259.642 80 9.8669.264 90 8.9438.387 91 8.8268.263 92 8.6788.133 93 8.5167.958 94 8.3127.796 95 8.0927.614 96 7.8017.416 97 7.4977.216 98 7.1956.955 99 6.8186.69 100 (minimum recorded flow) 1.0011.001
Statistical analysis of river flow data in the Horizons Region 224
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 29.018 disturbance MAF/median 19.013 indicators FRE3 (floods/year or season) 7.4886.325 STD Annual FRE3 3.2313.556 Mean Days of Accrual (days) 46.39442.506 STD Accrual (days) 48.06539.843 Min Accrual (days) 55 Max Accrual (days) 288180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 225
4.5.12. Whakapapa at Footbridge (sim natural) (333001), Jul-1960 to Jul-1972 (pre-diversion)
Site Whakapapa at Footbridge (sim natural)
Time series Data Start Time 12-Nov-59 details Data End Time 28-Nov-72 Analysis Start time 1-Jul-60 Analysis End time 1-Jul-72 Years of record analysed12 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 15.542 MALF 8.057 ½ median 6.0115.612 3x median 36.06633.672 MAF 244 Flow 0 (maximum recorded flow) 340.867 340.867 variability 10 23.8920.67 percentiles 20 17.1115.478 25 (upper quartile flow) 15.69714.25 30 14.58813.439 40 13.09912.337 50 (median flow) 12.02211.224 60 11.07810.429 70 10.2989.714 75 (lower quartile flow) 9.9399.361 80 9.5499.104 90 8.8398.358 91 8.758.288 92 8.6378.192 93 8.518.059 94 8.3767.825 95 8.2717.592 96 8.0597.4 97 7.6437.22 98 7.2676.989 99 6.8056.627 100 (minimum recorded flow) 6.2086.332
Statistical analysis of river flow data in the Horizons Region 226
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 30.284 disturbance MAF/median 20.296 indicators FRE3 (floods/year or season) 9.8338.396 STD Annual FRE3 3.3253.199 Mean Days of Accrual (days) 34.92333.22 STD Accrual (days) 34.65826.921 Min Accrual (days) 55 Max Accrual (days) 157136
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 227
4.5.13. Whakapapa at Footbridge (sim natural) (333001), Jul-1973 to Jul-1983 (1972 rules)
Site Whakapapa at Footbridge (sim natural)
Time series Data Start Time 28-Nov-72 details Data End Time 25-Dec-83 Analysis Start time 1-Jul-73 Analysis End time 1-Jul-83 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 14.724 MALF 7.959 ½ median 6.4185.929 3x median 38.50835.574 MAF 223.66 Flow 0 (maximum recorded flow) 340.615 340.615 variability 10 18.80116.209 percentiles 20 15.7214.48 25 (upper quartile flow) 15.08114.005 30 14.5613.539 40 13.7312.658 50 (median flow) 12.83611.858 60 12.06910.954 70 11.12910.147 75 (lower quartile flow) 10.6029.904 80 10.0839.394 90 8.968.454 91 8.8248.188 92 8.5897.894 93 8.2677.645 94 7.8557.276 95 7.3737.052 96 7.086.959 97 6.9116.848 98 6.7866.634 99 6.5816.186 100 (minimum recorded flow) 1.0011.001
Statistical analysis of river flow data in the Horizons Region 228
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 28.102 disturbance MAF/median 17.424 indicators FRE3 (floods/year or season) 5.95.439 STD Annual FRE3 3.1753.551 Mean Days of Accrual (days) 58.79352.257 STD Accrual (days) 66.02750.055 Min Accrual (days) 55 Max Accrual (days) 288180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 229
4.5.14. Whakapapa at Footbridge (sim natural) (333001), Jul-1984 to Jul-1992 (1983 rules)
Site Whakapapa at Footbridge (sim natural)
Time series Data Start Time 25-Dec-83 details Data End Time 1-Sep-92 Analysis Start time 1-Jul-84 Analysis End time 1-Jul-92 Years of record analysed8 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 15.2 MALF 8.313 ½ median 6.1595.895 3x median 36.95435.367 MAF 211.62 Flow 0 (maximum recorded flow) 279.361 279.361 variability 10 20.66218.434 percentiles 20 16.12514.364 25 (upper quartile flow) 14.94113.737 30 14.18413.237 40 13.10712.467 50 (median flow) 12.31811.789 60 11.51811.099 70 10.74910.583 75 (lower quartile flow) 10.47310.24 80 10.139.867 90 9.3619.261 91 9.2749.192 92 9.1929.095 93 9.0658.974 94 8.8798.848 95 8.7658.77 96 8.5218.595 97 8.0088.352 98 7.6327.835 99 7.4087.49 100 (minimum recorded flow) 7.0097.327
Statistical analysis of river flow data in the Horizons Region 230
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 25.457 disturbance MAF/median 17.18 indicators FRE3 (floods/year or season) 6.8747.052 STD Annual FRE3 4.2232.635 Mean Days of Accrual (days) 4739 STD Accrual (days) 50.44434.343 Min Accrual (days) 55 Max Accrual (days) 262135
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 231
4.5.15. Whakapapa at Footbridge (sim natural) (333001), Jul-1993 to Jul-2003 (Planning Tribunal 1990)
Site Whakapapa at Footbridge (sim natural)
Time series Data Start Time 1-Sep-92 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-93 Analysis End time 1-Jul-03 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 15.991 MALF 8.627 ½ median 6.4516.078 3x median 38.70636.465 MAF 288.23 Flow 0 (maximum recorded flow) 407.486 380.927 variability 10 21.45418.805 percentiles 20 17.3515.826 25 (upper quartile flow) 16.30815.009 30 15.50614.348 40 14.20913.08 50 (median flow) 12.90212.155 60 11.85411.018 70 10.7739.981 75 (lower quartile flow) 10.2599.37 80 9.7878.852 90 8.7568.141 91 8.6368.076 92 8.5187.972 93 8.3387.897 94 8.1877.831 95 8.0617.742 96 7.8947.642 97 7.7727.529 98 7.6027.401 99 7.3756.995 100 (minimum recorded flow) 6.6846.684
Statistical analysis of river flow data in the Horizons Region 232
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 33.41 disturbance MAF/median 22.34 indicators FRE3 (floods/year or season) 7.56.446 STD Annual FRE3 2.6743.997 Mean Days of Accrual (days) 44.50739.975 STD Accrual (days) 44.59640.674 Min Accrual (days) 55 Max Accrual (days) 181166
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 233
4.5.16. Whakapapa at Footbridge (sim consent) (8005), Jul-1962 to Jul-2003 (all data)
Site Whakapapa at Footbridge (sim consent)
Time series Data Start Time 1-Jul-62 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-62 Analysis End time 1-Jul-03 Years of record analysed41 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 5.14 MALF 3 ½ median 1.5121.517 3x median 9.0699.102 MAF 209.2 Flow 0 (maximum recorded flow) 377.486 350.927 variability 10 7.8178.452 percentiles 20 5.837.433 25 (upper quartile flow) 3.0356.97 30 3.0326.402 40 3.0283.041 50 (median flow) 3.0233.034 60 3.0183.027 70 3.0143.02 75 (lower quartile flow) 3.0123.017 80 3.0093.014 90 3.0053.007 91 3.0043.006 92 3.0043.005 93 3.0033.005 94 3.0033.004 95 3.0023.003 96 3.0023.003 97 3.0013.002 98 3.0013.001 99 33.001 100 (minimum recorded flow) 33
Statistical analysis of river flow data in the Horizons Region 234
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 69.733 disturbance MAF/median 69.203 indicators FRE3 (floods/year or season) 10.7079.879 STD Annual FRE3 3.4783.393 Mean Days of Accrual (days) 30.86828.913 STD Accrual (days) 29.10724.5 Min Accrual (days) 55 Max Accrual (days) 174150
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 235
4.5.17. Whakapapa at Footbridge (sim consent) (8005), Jul-1962 to Jul-1972 (pre-diversion)
Site Whakapapa at Footbridge (sim consent)
Time series Data Start Time 1-Jul-62 details Data End Time 28-Nov-72 Analysis Start time 1-Jul-62 Analysis End time 1-Jul-72 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 5.151 MALF 3 ½ median 1.5111.517 3x median 9.0639.102 MAF 220.9 Flow 0 (maximum recorded flow) 310.867 310.867 variability 10 7.8758.634 percentiles 20 5.9217.392 25 (upper quartile flow) 3.0316.994 30 3.0296.387 40 3.0253.041 50 (median flow) 3.0213.034 60 3.0163.027 70 3.0123.02 75 (lower quartile flow) 3.013.017 80 3.0083.014 90 3.0043.007 91 3.0043.006 92 3.0033.005 93 3.0033.005 94 3.0023.004 95 3.0023.003 96 3.0023.003 97 3.0013.002 98 3.0013.001 99 33.001 100 (minimum recorded flow) 33
Statistical analysis of river flow data in the Horizons Region 236
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 73.633 disturbance MAF/median 73.121 indicators FRE3 (floods/year or season) 11.89711.079 STD Annual FRE3 3.0323.037 Mean Days of Accrual (days) 27.62726.933 STD Accrual (days) 24.26922.326 Min Accrual (days) 55 Max Accrual (days) 126121
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 237
4.5.18. Whakapapa at Footbridge (sim consent) (8005), Jul-1973 to Jul-1983 (1972 rules)
Site Whakapapa at Footbridge (sim consent)
Time series Data Start Time 28-Nov-72 details Data End Time 25-Dec-83 Analysis Start time 1-Jul-73 Analysis End time 1-Jul-83 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 4.816 MALF 3 ½ median 1.511.512 3x median 9.0579.072 MAF 193.66 Flow 0 (maximum recorded flow) 310.615 310.615 variability 10 7.6938.362 percentiles 20 5.6397.386 25 (upper quartile flow) 3.0296.924 30 3.0276.339 40 3.0233.029 50 (median flow) 3.0193.024 60 3.0163.019 70 3.0123.014 75 (lower quartile flow) 3.013.012 80 3.0083.01 90 3.0043.005 91 3.0043.004 92 3.0033.004 93 3.0033.003 94 3.0023.003 95 3.0023.002 96 3.0023.002 97 3.0013.001 98 3.0013.001 99 33 100 (minimum recorded flow) 33
Statistical analysis of river flow data in the Horizons Region 238
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 64.553 disturbance MAF/median 64.147 indicators FRE3 (floods/year or season) 9.2018.464 STD Annual FRE3 3.852.808 Mean Days of Accrual (days) 35.93433.694 STD Accrual (days) 36.18627.959 Min Accrual (days) 55 Max Accrual (days) 174150
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 239
4.5.19. Whakapapa at Footbridge (sim consent) (8005), Jul-1984 to Jul-1992 (1983 rules)
Site Whakapapa at Footbridge (sim consent)
Time series Data Start Time 25-Dec-83 details Data End Time 1-Sep-92 AnalysisStart time 1-Jul-84 Analysis End time 1-Jul-92 Years of record analysed8 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 5.095 MALF 3 ½ median 1.5121.518 3x median 9.0729.108 MAF 181.62 Flow 0 (maximum recorded flow) 249.361 249.361 variability 10 7.7878.58 percentiles 20 5.137.445 25 (upper quartile flow) 3.0356.87 30 3.0335.847 40 3.0283.043 50 (median flow) 3.0243.036 60 3.0193.029 70 3.0143.022 75 (lower quartile flow) 3.0123.018 80 3.0093.014 90 3.0053.007 91 3.0043.006 92 3.0043.006 93 3.0033.005 94 3.0033.004 95 3.0023.004 96 3.0023.003 97 3.0013.002 98 3.0013.001 99 33.001 100 (minimum recorded flow) 33
Statistical analysis of river flow data in the Horizons Region 240
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 60.54 disturbance MAF/median 60.06 indicators FRE3 (floods/year or season) 9.99910.33 STD Annual FRE3 3.9283.319 Mean Days of Accrual (days) 33.20326.841 STD Accrual (days) 31.1822.965 Min Accrual (days) 55 Max Accrual (days) 143104
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 241
4.5.20. Whakapapa at Footbridge (sim consent) (8005), Jul-1993 to Jul-2003 (Planning Tribunal 1990)
Site Whakapapa at Footbridge (sim consent)
Time series Data Start Time 1-Sep-92 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-93 Analysis End time 1-Jul-03 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 5.502 MALF 3 ½ median 1.5161.52 3x median 9.0939.117 MAF 258.23 Flow 0 (maximum recorded flow) 377.486 350.927 variability 10 7.8538.227 percentiles 20 6.17.513 25 (upper quartile flow) 3.0477.002 30 3.0446.436 40 3.0373.047 50 (median flow) 3.0313.039 60 3.0253.031 70 3.0193.023 75 (lower quartile flow) 3.0163.019 80 3.0123.016 90 3.0063.008 91 3.0063.007 92 3.0053.006 93 3.0043.005 94 3.0043.005 95 3.0033.004 96 3.0023.003 97 3.0023.002 98 3.0013.002 99 3.0013.001 100 (minimum recorded flow) 33
Statistical analysis of river flow data in the Horizons Region 242
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 86.077 disturbance MAF/median 85.196 indicators FRE3 (floods/year or season) 11.20110.279 STD Annual FRE3 3.4864.185 Mean Days of Accrual (days) 28.7727.576 STD Accrual (days) 26.51525.809 Min Accrual (days) 55 Max Accrual (days) 146122
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 243
4.5.21. Whanganui at Matapuna (33338), Jul-1964 to Jul-1972 (pre-diversion)
Site Whanganui at Matapuna
Time series Data Start Time 30-Jun-64 details Data End Time 28-Nov-72 Analysis Start time 3-Jul-64 Analysis End time 1-Jul-72 Years of record analysed8 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 44.394 MALF 16.842 ½ median 17.6214.166 3x median 105.7284.993 MAF 502.51 Flow 0 (maximum recorded flow) 687.114 687.114 variability 10 76.69659.54 percentiles 20 56.45744.93 25 (upper quartile flow) 50.88240.683 30 46.73737.569 40 40.27232.546 50 (median flow) 35.2428.331 60 30.42425.567 70 26.53722.632 75 (lower quartile flow) 24.8221.141 80 23.13520.085 90 19.50317.236 91 19.10916.846 92 18.72516.635 93 18.13916.242 94 17.4815.752 95 16.82115.21 96 16.22114.497 97 15.26813.893 98 14.16613.428 99 13.31713.032 100 (minimum recorded flow) 10.86310.863
Statistical analysis of river flow data in the Horizons Region 244
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 29.837 disturbance MAF/median 14.26 indicators FRE3 (floods/year or season) 6.3736.296 STD Annual FRE3 2.322.938 Mean Days of Accrual (days) 53.9445.483 STD Accrual (days) 62.27442.631 Min Accrual (days) 55 Max Accrual (days) 393181
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 245
4.5.22. Whanganui at Paetawa (33301), Jul-1957 to Jul-2004 (all data)
Site Whanganui at Paetawa
Time series Data Start Time 26-Jul-57 details Data End Time 4-Apr-05 Analysis Start time 26-Jul-57 Analysis End time 1-Jul-04 Years of record analysed47 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 216.166 MALF 39.132 ½ median 64.34641.838 3x median 386.076251.025 MAF 2316.1 Flow 0 (maximum recorded flow) 4105.8 4105.8 variability 10 473.562303.044 percentiles 20 300.199182.546 25 (upper quartile flow) 253.184153.252 30 217.133131.665 40 164.806103 50 (median flow) 128.69283.675 60 102.07870.332 70 80.61860.077 75 (lower quartile flow) 71.96255.308 80 63.97650.949 90 49.2541.372 91 47.74540.265 92 46.05539.217 93 44.18438.031 94 42.2436.846 95 40.30735.349 96 38.16733.907 97 35.78532.408 98 33.22930.636 99 30.40727.604 100 (minimum recorded flow) 22.21222.212
Statistical analysis of river flow data in the Horizons Region 246
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 19.397 disturbance MAF/median 17.997 indicators FRE3 (floods/year or season) 11.08510.375 STD Annual FRE3 2.6513.872 Mean Days of Accrual (days) 27.35526.285 STD Accrual (days) 30.57425.501 Min Accrual (days) 55 Max Accrual (days) 236184
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 247
4.5.23. Whanganui at Paetawa (33301), Jul-1957 to Jul-1972 (pre-diversion)
Site Whanganui at Paetawa
Time series Data Start Time 26-Jul-57 details Data End Time 28-Nov-72 Analysis Start time 26-Jul-57 Analysis End time 1-Jul-72 Years of record analysed15 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 220.637 MALF 45.356 ½ median 68.04746.2 3x median 408.279277.2 MAF 2242.5 Flow 0 (maximum recorded flow) 3844.6 3844.6 variability 10 470.918330.767 percentiles 20 302.971198.274 25 (upper quartile flow) 258.355166.764 30 223.565143.666 40 171.521112.633 50 (median flow) 136.09392.4 60 110.66478.013 70 89.80267.13 75 (lower quartile flow) 80.7762.229 80 72.69357.796 90 56.63148.604 91 55.17347.667 92 53.63446.487 93 51.81245.219 94 49.84443.445 95 48.12541.646 96 45.79639.233 97 42.69336.985 98 38.3533.859 99 32.92130.515 100 (minimum recorded flow) 26.98726.987
Statistical analysis of river flow data in the Horizons Region 248
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 49.712 disturbance MAF/median 16.478 indicators FRE3 (floods/year or season) 10.69.941 STD Annual FRE3 2.7984.21 Mean Days of Accrual (days) 28.59527.565 STD Accrual (days) 32.2426.059 Min Accrual (days) 55 Max Accrual (days) 236180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 249
4.5.24. Whanganui at Paetawa (33301), Jul-1973 to Jul-1983 (1972 rules)
Site Whanganui atPaetawa
Time series Data Start Time 28-Nov-72 details Data End Time 25-Dec-83 Analysis Start time 1-Jul-73 Analysis End time 1-Jul-83 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 204.495 MALF 32.221 ½ median 62.46537.106 3x median 374.787222.633 MAF 2274.6 Flow 0 (maximum recorded flow) 3133.9 3071.5 variability 10 452.341257.446 percentiles 20 289.437162.929 25 (upper quartile flow) 246.246137.79 30 212.127118.052 40 162.68791.32 50 (median flow) 124.92974.211 60 95.54362.478 70 73.59650.79 75 (lower quartile flow) 64.66645.941 80 56.53641.106 90 39.02332.763 91 37.48832.087 92 36.11531.455 93 34.74430.641 94 33.48129.807 95 32.35128.889 96 31.13527.818 97 29.78226.719 98 27.84625.257 99 25.28124.037 100 (minimum recorded flow) 22.21222.212
Statistical analysis of river flow data in the Horizons Region 250
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 70.594 disturbance MAF/median 18.207 indicators FRE3 (floods/year or season) 11.111.083 STD Annual FRE3 2.4652.712 Mean Days of Accrual (days) 27.50925.71 STD Accrual (days) 33.27725.084 Min Accrual (days) 55 Max Accrual (days) 182140
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 251
4.5.25. Whanganui at Paetawa (33301), Jul-1984 to Jul-1992 (1983 rules)
Site Whanganui at Paetawa
Time series Data Start Time 25-Dec-83 details Data End Time 1-Sep-92 Analysis Start time 1-Jul-84 Analysis End time 1-Jul-92 Years of record analysed8 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 205.635 MALF 33.961 ½ median 59.95839.659 3x median 359.745237.951 MAF 2354 Flow 0 (maximum recorded flow) 4105.8 4105.8 variability 10 466.528287.708 percentiles 20 292.678172.234 25 (upper quartile flow) 244.122142.99 30 206.386123.647 40 153.47298.489 50 (median flow) 119.91579.317 60 95.41166.81 70 74.87256.389 75 (lower quartile flow) 67.02651.826 80 59.47247.605 90 45.43840.019 91 44.04639.318 92 42.46838.282 93 41.06837.138 94 39.83436.134 95 38.2435.152 96 36.3334.221 97 34.6433.255 98 33.14332.34 99 31.41230.519 100 (minimum recorded flow) 26.59226.592
Statistical analysis of river flow data in the Horizons Region 252
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 69.315 disturbance MAF/median 19.631 indicators FRE3 (floods/year or season) 11.2511.84 STD Annual FRE3 2.1223.133 Mean Days of Accrual (days) 26.66723.327 STD Accrual (days) 26.07521.65 Min Accrual (days) 55 Max Accrual (days) 145103
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 253
4.5.26. Whanganui at Paetawa (33301), Jul-1993 to Jul-2004 (Planning Tribunal 1990)
Site Whanganui at Paetawa
Time series Data Start Time 1-Sep-92 details Data End Time 1-Dec-04 Analysis Start time 1-Jul-93 Analysis End time 1-Jul-04 Years of record analysed11 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 230.99 MALF 41.286 ½ median 65.56844.349 3x median 393.408266.091 MAF 2683.9 Flow 0 (maximum recorded flow) 3815.4 3292.9 variability 10 501.999351.305 percentiles 20 317.263208.576 25 (upper quartile flow) 263.123172.837 30 222.613147.178 40 168.189113.41 50 (median flow) 131.13688.697 60 103.49773.494 70 80.10462.604 75 (lower quartile flow) 71.97657.471 80 64.353.39 90 51.77545.576 91 50.65144.426 92 49.35743.27 93 48.12542.305 94 46.57141.54 95 44.93940.705 96 42.92339.778 97 41.38538.96 98 39.68337.905 99 37.76635.989 100 (minimum recorded flow) 33.40133.401
Statistical analysis of river flow data in the Horizons Region 254
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 65.008 disturbance MAF/median 20.467 indicators FRE3 (floods/year or season) 11.81710.254 STD Annual FRE3 2.9564.161 Mean Days of Accrual (days) 25.01525.266 STD Accrual (days) 26.72126.061 Min Accrual (days) 55 Max Accrual (days) 145123
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 255
4.5.27. Whanganui at Paetawa (sim natural) (333005), Jul-1951 to Jul-2003 (all data)
Site Whanganui at Paetawa (sim natural)
Time series Data Start Time 1-Jul-51 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-51 Analysis End time 1-Jul-03 Years of record analysed52 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 228.937 MALF 43.847 ½ median 71.74647.861 3x median 430.473287.166 MAF 2286.8 Flow 0 (maximum recorded flow) 4084.8 4084.8 variability 10 489.074321.385 percentiles 20 319.927199.902 25 (upper quartile flow) 272.13168.896 30 234.487146.014 40 181.267116.598 50 (median flow) 143.49195.722 60 115.49280.931 70 93.01568.461 75 (lower quartile flow) 83.41563.048 80 74.24258.026 90 56.53947.683 91 54.80446.617 92 52.98545.537 93 50.96444.259 94 48.79743.027 95 46.80441.505 96 44.6139.904 97 42.23537.961 98 39.53435.722 99 35.56332.42 100 (minimum recorded flow) 26.08526.085
Statistical analysis of river flow data in the Horizons Region 256
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 52.154 disturbance MAF/median 15.937 indicators FRE3 (floods/year or season) 10.4619.765 STD Annual FRE3 2.7383.706 Mean Days of Accrual (days) 29.59828.111 STD Accrual (days) 33.63126.321 Min Accrual (days) 55 Max Accrual (days) 249180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 257
4.5.28. Whanganui at Paetawa (sim natural) (333005), Jul-1951 to Jul-1972 (pre-diversion)
Site Whanganui at Paetawa (sim natural)
Time series Data Start Time 1-Jul-51 details Data End Time 28-Nov-72 Analysis Start time 1-Jul-51 Analysis End time 1-Jul-72 Years of record analysed21 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 229.362 MALF 46.14 ½ median 73.46250.075 3x median 440.772300.45 MAF 2170.7 Flow 0 (maximum recorded flow) 3794.2 3794.2 variability 10 480.958346.723 percentiles 20 321.41220.106 25 (upper quartile flow) 275.24180.459 30 238.867154.728 40 184.537122.091 50 (median flow) 146.924100.15 60 118.71284.106 70 96.06270.486 75 (lower quartile flow) 86.62865.318 80 76.89360.078 90 59.20250.057 91 57.40448.878 92 55.63847.863 93 54.03846.815 94 52.04945.378 95 49.7543.701 96 47.71941.885 97 45.09839.341 98 41.35336.587 99 36.15731.657 100 (minimum recorded flow) 26.99526.995
Statistical analysis of river flow data in the Horizons Region 258
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 47.046 disturbance MAF/median 14.774 indicators FRE3 (floods/year or season) 9.8559.307 STD Annual FRE3 2.9323.636 Mean Days of Accrual (days) 31.61229.373 STD Accrual (days) 36.6626.102 Min Accrual (days) 55 Max Accrual (days) 252180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 259
4.5.29. Whanganui at Paetawa (sim natural) (333005), Jul-1973 to Jul-1983 (1972 rules)
Site Whanganui at Paetawa (sim natural)
Time series Data Start Time 28-Nov-72 details Data End Time 25-Dec-83 Analysis Start time 1-Jul-73 Analysis End time 1-Jul-83 Years of record analysed10 Gaps in the data (% of record).None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 223.417 MALF 41.978 ½ median 71.93745.71 3x median 431.622274.257 MAF 2295 Flow 0 (maximum recorded flow) 3152 3107 variability 10 477280.714 percentiles 20 311.575182.335 25 (upper quartile flow) 268.871157.461 30 233.1137.602 40 182.65109.657 50 (median flow) 143.87491.419 60 113.4477.831 70 90.35464.386 75 (lower quartile flow) 80.46758.709 80 70.91353.668 90 51.00844.582 91 49.29843.579 92 47.72841.728 93 46.36140.243 94 44.76438.204 95 42.66536.896 96 40.47435.38 97 37.88833.117 98 35.24631.63 99 31.66130.522 100 (minimum recorded flow) 26.08526.085
Statistical analysis of river flow data in the Horizons Region 260
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 54.671 disturbance MAF/median 15.951 indicators FRE3 (floods/year or season) 9.910.681 STD Annual FRE3 2.022.844 Mean Days of Accrual (days) 31.22228.633 STD Accrual (days) 38.21327.164 Min Accrual (days) 55 Max Accrual (days) 223140
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 261
4.5.30. Whanganui at Paetawa (sim natural) (333005), Jul-1984 to Jul-1992 (1983 rules)
Site Whanganui at Paetawa (sim natural)
Time series Data Start Time 25-Dec-83 details Data End Time 1-Sep-92 Analysis Start time 1-Jul-84 Analysis End time 1-Jul-92 Years of record analysed8 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 223.625 MALF 42.132 ½ median 68.4147.785 3x median 410.457286.71 MAF 2369.9 Flow 0 (maximum recorded flow) 4084.8 4084.8 variability 10 489.515314.803 percentiles 20 315.365190.032 25 (upper quartile flow) 264.996159.169 30 226.76140.478 40 171.843114.894 50 (median flow) 136.81995.57 60 111.57681.862 70 90.72571.09 75 (lower quartile flow) 81.9666.138 80 74.38361.491 90 58.25251.345 91 56.35550.299 92 54.5149.045 93 52.85647.613 94 51.23746.482 95 49.09945.509 96 46.70744.296 97 44.69842.779 98 42.22340.22 99 39.77737.75 100 (minimum recorded flow) 34.0734.07
Statistical analysis of river flow data in the Horizons Region 262
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 56.249 disturbance MAF/median 17.321 indicators FRE3 (floods/year or season) 11.2510.579 STD Annual FRE3 2.1862.995 Mean Days of Accrual (days) 27.18925.489 STD Accrual (days) 26.66624.154 Min Accrual (days) 56 Max Accrual (days) 145104
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 263
4.5.31. Whanganui at Paetawa (sim natural) (333005), Jul-1993 to Jul-2003 (Planning Tribunal 1990)
Site Whanganui at Paetawa (sim natural)
Time series Data Start Time 1-Sep-92 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-93 Analysis End time 1-Jul-03 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 240.149 MALF 43.672 ½ median 73.04549.49 3x median 438.27296.937 MAF 2719.2 Flow 0 (maximum recorded flow) 3816.1 3028.2 variability 10 513.712341.355 percentiles 20 332.053212.998 25 (upper quartile flow) 278.121180.44 30 237.845156.754 40 183.723124.511 50 (median flow) 146.0998.979 60 117.49882.837 70 92.74568.787 75 (lower quartile flow) 83.27462.599 80 73.72757.109 90 55.96545.503 91 53.93444.344 92 51.87943.499 93 49.77242.612 94 47.62341.798 95 45.15740.93 96 43.38240.25 97 41.78439.173 98 40.2237.711 99 37.71635.573 100 (minimum recorded flow) 34.16734.167
Statistical analysis of river flow data in the Horizons Region 264
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 62.264 disturbance MAF/median 18.613 indicators FRE3 (floods/year or season) 11.1019.671 STD Annual FRE3 3.0714.9 Mean Days of Accrual (days) 27.15525.37 STD Accrual (days) 30.32423.902 Min Accrual (days) 55 Max Accrual (days) 163107
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 265
4.5.32. Whanganui at Paetawa (sim consent) (8005), Jul-1962 to Jul-2003 (all data)
Site Whanganui at Paetawa (sim consent)
Time series Data Start Time 1-Jul-62 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-62 Analysis End time 1-Jul-03 Years of record analysed41 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 209.905 MALF 40.533 ½ median 62.48738.779 3x median 374.919232.674 MAF 2285.6 Flow 0 (maximum recorded flow) 4074.2 4074.2 variability 10 460.146282.348 percentiles 20 292.76170.582 25 (upper quartile flow) 247.05143.3 30 210.945123.811 40 160.63396.247 50 (median flow) 124.97377.558 60 98.10365.345 70 76.6255.996 75 (lower quartile flow) 68.00152.691 80 60.59349.921 90 48.96243.974 91 48.00843.274 92 47.00542.521 93 45.81241.702 94 44.59440.614 95 43.34539.545 96 41.94538.182 97 40.20836.671 98 37.81634.79 99 34.55331.67 100 (minimum recorded flow) 26.08526.085
Statistical analysis of river flow data in the Horizons Region 266
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 391.169 disturbance MAF/median 18.289 indicators FRE3 (floods/year or season) 11.26810.763 STD Annual FRE3 2.5394.017 Mean Days of Accrual (days) 26.90525.8 STD Accrual (days) 30.31725.18 Min Accrual (days) 55 Max Accrual (days) 237180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 267
4.5.33. Whanganui at Paetawa (sim consent) (8005), Jul-1962 to Jul-1972 (pre-diversion)
Site Whanganui at Paetawa (sim consent)
Time series Data Start Time 1-Jul-62 details Data End Time 28-Nov-72 Analysis Start time 1-Jul-62 Analysis End time 1-Jul-72 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 203.848 MALF 40.901 ½ median 62.69737.86 3x median 376.182227.157 MAF 2136.6 Flow 0 (maximum recorded flow) 3206.7 3206.7 variability 10 440.776298.426 percentiles 20 284.164175.461 25 (upper quartile flow) 241.614146.784 30 207.544125.845 40 159.33895.753 50 (median flow) 125.39475.719 60 98.64262.747 70 76.10854.009 75 (lower quartile flow) 67.1851.005 80 58.84748.306 90 47.66842.297 91 46.57641.164 92 45.57940.168 93 44.75739.335 94 43.59638.42 95 41.87337.466 96 39.90736.269 97 38.23233.445 98 35.82431.523 99 31.45428.917 100 (minimum recorded flow) 26.99526.995
Statistical analysis of river flow data in the Horizons Region 268
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 52.238 disturbance MAF/median 17.039 indicators FRE3 (floods/year or season) 11.39911.284 STD Annual FRE3 2.9524.685 Mean Days of Accrual (days) 2724.587 STD Accrual (days) 31.1921.659 Min Accrual (days) 55 Max Accrual (days) 237126
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 269
4.5.34. Whanganui at Paetawa (sim consent) (8005), Jul-1973 to Jul-1983 (1972 rules)
Site Whanganui at Paetawa (sim consent)
Time series Data Start Time 28-Nov-72 details Data End Time 25-Dec-83 Analysis Start time 1-Jul-73 Analysis End time 1-Jul-83 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 207.039 MALF 39.766 ½ median 63.5838.15 3x median 381.477228.897 MAF 2262.8 Flow 0 (maximum recorded flow) 3104.3 3059.4 variability 10 451.39259.554 percentiles 20 290.705163.934 25 (upper quartile flow) 248.289139.026 30 214.165120.396 40 164.90393.513 50 (median flow) 127.15976.299 60 97.75664.535 70 75.95554.639 75 (lower quartile flow) 67.05951.196 80 59.22148.213 90 47.19742.771 91 46.12342.153 92 44.88641.272 93 43.94140.102 94 43.00838.222 95 41.89836.895 96 40.22835.373 97 37.433.113 98 34.84831.636 99 31.60330.517 100 (minimum recorded flow) 26.08526.085
Statistical analysis of river flow data in the Horizons Region 270
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 56.903 disturbance MAF/median 17.795 indicators FRE3 (floods/year or season) 10.50111.689 STD Annual FRE3 1.8962.462 Mean Days of Accrual (days) 28.84825.846 STD Accrual (days) 33.22425.827 Min Accrual (days) 55 Max Accrual (days) 183140
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 271
4.5.35. Whanganui at Paetawa (sim consent) (8005), Jul-1984 to Jul-1992 (1983 rules)
Site Whanganui at Paetawa (sim consent)
Time series Data Start Time 25-Dec-83 details Data End Time 1-Sep-92 Analysis Start time 1-Jul-84 Analysis End time 1-Jul-92 Years of record analysed8 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 206.856 MALF 40.635 ½ median 60.70440.296 3x median 364.224241.776 MAF 2338.5 Flow 0 (maximum recorded flow) 4074.2 4074.2 variability 10 463.279290.154 percentiles 20 292.97169.52 25 (upper quartile flow) 244.538140.809 30 206.824123.53 40 154.3398.716 50 (median flow) 121.40880.592 60 96.87668.212 70 76.96659.331 75 (lower quartile flow) 69.08255.77 80 62.48952.713 90 51.27547.687 91 50.32847.165 92 49.32446.521 93 48.41545.803 94 47.46645.001 95 46.44544.174 96 44.98443.376 97 43.55742.267 98 41.8340.219 99 39.49937.754 100 (minimum recorded flow) 32.62834.07
Statistical analysis of river flow data in the Horizons Region 272
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 57.549 disturbance MAF/median 19.261 indicators FRE3 (floods/year or season) 11.62511.84 STD Annual FRE3 2.2023.313 Mean Days of Accrual (days) 25.95723.269 STD Accrual (days) 26.25822.555 Min Accrual (days) 56 Max Accrual (days) 145103
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 273
4.5.36. Whanganui at Paetawa (sim consent) (8005), Jul-1993 to Jul-2003 (Planning Tribunal 1990)
Site Whanganui at Paetawa (sim consent)
Time series Data Start Time 1-Sep-92 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-93 Analysis End time 1-Jul-03 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 222.822 MALF 41.253 ½ median 64.45541.76 3x median 386.727250.557 MAF 2687.4 Flow 0 (maximum recorded flow) 3771.6 2980.6 variability 10 485.701315.697 percentiles 20 307.784192.978 25 (upper quartile flow) 256.049160.916 30 217.315138.027 40 164.964107.646 50 (median flow) 128.90983.519 60 102.19469.413 70 78.67358.825 75 (lower quartile flow) 70.44654.159 80 62.35751.087 90 50.38344.418 91 49.33343.559 92 48.37442.776 93 47.33742.131 94 45.98941.468 95 44.20140.836 96 42.71440.162 97 41.52639.131 98 40.15637.707 99 37.70835.599 100 (minimum recorded flow) 34.16734.167
Statistical analysis of river flow data in the Horizons Region 274
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 65.144 disturbance MAF/median 20.847 indicators FRE3 (floods/year or season) 11.50110.275 STD Annual FRE3 2.9525.391 Mean Days of Accrual (days) 25.64923.614 STD Accrual (days) 27.99622.682 Min Accrual (days) 55 Max Accrual (days) 163107
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 275
4.5.37. Whanganui at Piriaka (33356), Jul-1971 to Jul-2003 (all data)
Site Whanganui at Piriaka
Time series Data Start Time 1-Dec-70 details Data End Time 1-Jan-04 Analysis Start time 1-Jul-71 Analysis End time 1-Jul-03 Years of record analysed32 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 27.722 MALF 9.24 ½ median 9.2768.148 3x median 55.65648.888 MAF 600.53 Flow 0 (maximum recorded flow) 1056.4 934.19 variability 10 48.79235.005 percentiles 20 32.41624.44 25 (upper quartile flow) 28.36521.783 30 25.47120.068 40 21.24818.034 50 (median flow) 18.55216.296 60 16.49914.372 70 14.35712.404 75 (lower quartile flow) 13.31311.42 80 12.15710.536 90 9.6758.437 91 9.358.261 92 8.9548.092 93 8.6527.953 94 8.367.81 95 8.0987.669 96 7.8467.529 97 7.6197.374 98 7.4417.207 99 7.1456.948 100 (minimum recorded flow) 3.8723.872
Statistical analysis of river flow data in the Horizons Region 276
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 64.992 disturbance MAF/median 32.37 indicators FRE3 (floods/year or season) 9.2497.803 STD Annual FRE3 2.8144.133 Mean Days of Accrual (days) 34.93635.04 STD Accrual (days) 34.98633.004 Min Accrual (days) 55 Max Accrual (days) 224159
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 277
4.5.38. Whanganui at Piriaka (33356), Jul-1973 to Jul-1983 (1972 rules)
Site Whanganui at Piriaka
Time series Data Start Time 28-Nov-72 details Data End Time 25-Dec-83 Analysis Start time 1-Jul-73 Analysis End time 1-Jul-83 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 23.917 MALF 7.235 ½ median 8.2026.18 3x median 49.20937.077 MAF 521.64 Flow 0 (maximum recorded flow) 894.382 894.382 variability 10 42.16230.435 percentiles 20 28.83920.972 25 (upper quartile flow) 25.50418.679 30 22.97816.907 40 19.30714.175 50 (median flow) 16.40312.359 60 13.90411.023 70 11.8719.896 75 (lower quartile flow) 10.9439.139 80 10.1788.48 90 8.1977.664 91 8.097.596 92 7.9337.525 93 7.8157.452 94 7.6927.381 95 7.5687.313 96 7.447.241 97 7.3127.085 98 7.1866.95 99 6.9366.75 100 (minimum recorded flow) 4.0244.245
Statistical analysis of river flow data in the Horizons Region 278
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 72.1 disturbance MAF/median 31.801 indicators FRE3 (floods/year or season) 9.5999.471 STD Annual FRE3 3.3312.321 Mean Days of Accrual (days) 33.88432.113 STD Accrual (days) 35.69930.226 Min Accrual (days) 55 Max Accrual (days) 224149
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 279
4.5.39. Whanganui at Piriaka (33356), Jul-1984 to Jul-1992 (1983 rules)
Site Whanganui at Piriaka
Time series Data Start Time 25-Dec-83 details Data End Time 1-Sep-92 Analysis Start time 1-Jul-84 Analysis End time 1-Jul-92 Years of record analysed8 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 24.984 MALF 7.208 ½ median 7.6686.421 3x median 46.00538.523 MAF 537.56 Flow 0 (maximum recorded flow) 769.051 769.051 variability 10 45.29834.236 percentiles 20 29.42722.115 25 (upper quartile flow) 25.46919.364 30 22.51417.36 40 18.32514.432 50 (median flow) 15.33512.841 60 13.39911.58 70 11.69310.425 75 (lower quartile flow) 10.9759.886 80 10.1939.19 90 8.4497.913 91 8.2667.807 92 8.077.703 93 7.9067.606 94 7.7597.53 95 7.6237.44 96 7.4967.318 97 7.3927.174 98 7.2777.044 99 6.9846.8 100 (minimum recorded flow) 3.8893.917
Statistical analysis of river flow data in the Horizons Region 280
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 74.578 disturbance MAF/median 35.054 indicators FRE3 (floods/year or season) 10.12410.073 STD Annual FRE3 2.7462.625 Mean Days of Accrual (days) 31.3728.023 STD Accrual (days) 28.17324.301 Min Accrual (days) 55 Max Accrual (days) 12489
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 281
4.5.40. Whanganui at Piriaka (33356), Jul-1993 to Jul-2003 (Planning Tribunal 1990)
Site Whanganui at Piriaka
Time series Data Start Time 1-Sep-92 details Data End Time 1-Jan-04 Analysis Start time 1-Jul-93 Analysis End time 1-Jul-03 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 30.825 MALF 11.901 ½ median 10.0449.336 3x median 60.26456.016 MAF 758.19 Flow 0 (maximum recorded flow) 1056.4 934.19 variability 10 50.1736.285 percentiles 20 33.86126.117 25 (upper quartile flow) 29.62123.639 30 26.72421.825 40 22.76719.779 50 (median flow) 20.08818.672 60 18.52717.74 70 17.25616.829 75 (lower quartile flow) 16.6216.335 80 15.89315.779 90 14.1214.183 91 13.88913.984 92 13.64213.759 93 13.42913.542 94 13.1813.351 95 12.90213.1 96 12.58312.829 97 12.19512.531 98 11.73312.109 99 11.06911.375 100 (minimum recorded flow) 4.5664.566
Statistical analysis of river flow data in the Horizons Region 282
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 63.708 disturbance MAF/median 37.743 indicators FRE3 (floods/year or season) 9.17.05 STD Annual FRE3 2.5114.466 Mean Days of Accrual (days) 34.935.884 STD Accrual (days) 35.22438.298 Min Accrual (days) 55 Max Accrual (days) 179161
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 283
4.5.41. Whanganui at Piriaka (sim natural) (33300), Jul-1964 to Jul-2003 (all data)
Site Whanganui at Piriaka (sim natural)
Time series Data Start Time 3-Jul-64 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-64 Analysis End time 1-Jul-03 Years of record analysed39 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 44.389 MALF 18.031 ½ median 17.23514.601 3x median 103.40787.603 MAF 557.8 Flow 0 (maximum recorded flow) 987.965 843.598 variability 10 73.86655.01 percentiles 20 53.45441.617 25 (upper quartile flow) 48.16338.332 30 44.36735.982 40 38.64832.305 50 (median flow) 34.46929.201 60 30.8926.481 70 27.49923.865 75 (lower quartile flow) 25.89622.628 80 24.26621.381 90 20.63918.748 91 20.21318.38 92 19.77317.997 93 19.23617.574 94 18.69617.079 95 18.01216.516 96 17.21315.728 97 16.26814.989 98 15.24714.453 99 14.35113.62 100 (minimum recorded flow) 7.500 (estimate) 10.852
Statistical analysis of river flow data in the Horizons Region 284
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 19.949 disturbance MAF/median 16.183 indicators FRE3 (floods/year or season) 7.235.94 STD Annual FRE3 2.8943.542 Mean Days of Accrual (days) 46.9344.946 STD Accrual (days) 49.16340.603 Min Accrual (days) 55 Max Accrual (days) 324180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 285
4.5.42. Whanganui at Piriaka (sim natural) (33300), Jul-1964 to Jul-1972 (pre-diversion)
Site Whanganui at Piriaka (sim natural)
Time series Data Start Time 3-Jul-64 details Data End Time 28-Nov-72 Analysis Start time 1-Jul-64 Analysis End time 1-Jul-72 Years of record analysed8 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 44.379 MALF 18.294 ½ median 17.34614.323 3x median 104.07685.938 MAF 492.6 Flow 0 (maximum recorded flow) 695.462 695.462 variability 10 76.51957.347 percentiles 20 53.80142.746 25 (upper quartile flow) 48.25339.176 30 44.19136.514 40 38.64732.309 50 (median flow) 34.69228.646 60 30.59526.047 70 27.15523.467 75 (lower quartile flow) 25.57222.053 80 24.00920.741 90 20.00417.846 91 19.61117.337 92 19.19316.979 93 18.70516.509 94 18.02415.935 95 17.18515.344 96 16.43414.759 97 15.39414.219 98 14.42813.733 99 13.5213.231 100 (minimum recorded flow) 7.500 (estimate) 12.42
Statistical analysis of river flow data in the Horizons Region 286
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 32.774 disturbance MAF/median 14.199 indicators FRE3 (floods/year or season) 6.4986.296 STD Annual FRE3 2.3853.13 Mean Days of Accrual (days) 51.2543.833 STD Accrual (days) 54.07939.618 Min Accrual (days) 55 Max Accrual (days) 324180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 287
4.5.43. Whanganui at Piriaka (sim natural) (33300), Jul-1973 to Jul-1983 (1972 rules)
Site Whanganui at Piriaka (sim natural)
Time series Data Start Time 28-Nov-72 details Data End Time 25-Dec-83 Analysis Start time 1-Jul-73 Analysis End time 1-Jul-83 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 42.813 MALF 17.549 ½ median 17.56914.672 3x median 105.41188.029 MAF 509.59 Flow 0 (maximum recorded flow) 824.323 824.323 variability 10 68.37350.91 percentiles 20 51.4839.822 25 (upper quartile flow) 47.06337.368 30 43.8235.478 40 38.76932.331 50 (median flow) 35.13729.343 60 31.80126.343 70 28.2223.386 75 (lower quartile flow) 26.18922.166 80 23.93121.061 90 20.16218.582 91 19.77618.137 92 19.24917.492 93 18.6816.709 94 17.87316.083 95 16.91415.396 96 15.9814.839 97 15.18814.565 98 14.61814.19 99 14.10413.319 100 (minimum recorded flow) 10.85210.852
Statistical analysis of river flow data in the Horizons Region 288
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 29.038 disturbance MAF/median 14.503 indicators FRE3 (floods/year or season) 6.84.835 STD Annual FRE3 3.1182.878 Mean Days of Accrual (days) 50.31356.625 STD Accrual (days) 59.01447.968 Min Accrual (days) 58 Max Accrual (days) 244180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 289
4.5.44. Whanganui at Piriaka (sim natural) (33300), Jul-1984 to Jul-1992 (1983 rules)
Site Whanganui at Piriaka (sim natural)
Time series Data Start Time 25-Dec-83 details Data End Time 1-Sep-92 Analysis Start time 1-Jul-84 Analysis End time 1-Jul-92 Years of record analysed8 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 43.49 MALF 18.199 ½ median 16.45714.584 3x median 98.73987.501 MAF 525.83 Flow 0 (maximum recorded flow) 746.654 746.654 variability 10 71.96854.295 percentiles 20 51.82340.747 25 (upper quartile flow) 46.50737.51 30 42.48935.196 40 36.76531.689 50 (median flow) 32.91329.167 60 29.87426.915 70 27.09124.878 75 (lower quartile flow) 25.77723.761 80 24.57722.663 90 21.52620.409 91 21.14320.209 92 20.78919.992 93 20.45919.706 94 20.11119.375 95 19.63819.052 96 19.0918.575 97 18.31917.94 98 17.05317.126 99 15.87516.125 100 (minimum recorded flow) 14.24314.243
Statistical analysis of river flow data in the Horizons Region 290
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 28.893 disturbance MAF/median 15.976 indicators FRE3 (floods/year or season) 7.9997.05 STD Annual FRE3 3.7022.843 Mean Days of Accrual (days) 42.539.364 STD Accrual (days) 41.37234.384 Min Accrual (days) 55 Max Accrual (days) 187134
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 291
4.5.45. Whanganui at Piriaka (sim natural) (33300), Jul-1993 to Jul-2003 (Planning Tribunal 1990)
Site Whanganui at Piriaka (sim natural)
Time series Data Start Time 1-Sep-92 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-93 Analysis End time 1-Jul-03 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 46.698 MALF 18.848 ½ median 17.71215.203 3x median 106.27291.215 MAF 713.87 Flow 0 (maximum recorded flow) 987.965 843.598 variability 10 76.78859.444 percentiles 20 56.39145.071 25 (upper quartile flow) 50.64141.147 30 46.4138.354 40 40.46434.048 50 (median flow) 35.42430.405 60 31.45227.205 70 27.74124.421 75 (lower quartile flow) 26.16522.968 80 24.52921.624 90 21.09418.622 91 20.66818.201 92 20.13317.828 93 19.62917.391 94 18.92716.825 95 18.27815.889 96 17.5315.205 97 16.4214.691 98 15.18214.323 99 14.31713.418 100 (minimum recorded flow) 12.0812.08
Statistical analysis of river flow data in the Horizons Region 292
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 37.875 disturbance MAF/median 20.152 indicators FRE3 (floods/year or season) 7.67.05 STD Annual FRE3 3.4014.849 Mean Days of Accrual (days) 42.86836.419 STD Accrual (days) 44.35340.034 Min Accrual (days) 55 Max Accrual (days) 180166
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 293
4.5.46. Whanganui at Piriaka (sim consent) (8005), Jul-1964 to Jul-2003 (all data)
Site Whanganui at Piriaka (sim consent)
Time series Data Start Time 3-Jul-64 details Data End Time 1-Jul-03 Analysis Start time 4-Jul-64 Analysis End time 1-Jul-03 Years of record analysed39 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 27.508 MALF 9.257 ½ median 9.4678.504 3x median 56.79951.021 MAF 517.82 Flow 0 (maximum recorded flow) 940.346 812.504 variability 10 44.7630.312 percentiles 20 31.07822.163 25 (upper quartile flow) 27.5620.476 30 24.95419.439 40 21.26718.121 50 (median flow) 18.93317.007 60 17.39916.015 70 16.05715.053 75 (lower quartile flow) 15.414.605 80 14.76414.145 90 13.3913.057 91 13.22512.917 92 13.05712.756 93 12.85212.579 94 12.62612.371 95 12.36712.145 96 12.06311.872 97 11.67811.502 98 11.11810.939 99 10.18910.054 100 (minimum recorded flow) 7.500 (estimate) 7.500 (estimate)
Statistical analysis of river flow data in the Horizons Region 294
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 20.481 disturbance MAF/median 27.35 indicators FRE3 (floods/year or season) 8.4366.56 STD Annual FRE3 3.1333.655 Mean Days of Accrual (days) 39.49240.769 STD Accrual (days) 41.67739 Min Accrual (days) 55 Max Accrual (days) 324180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 295
4.5.47. Whanganui at Piriaka (sim consent) (8005), Jul-1964 to Jul-1972 (pre-diversion)
Site Whanganui at Piriaka (sim consent)
Time series Data Start Time 3-Jul-64 details Data End Time 28-Nov-72 Analysis Start time 4-Jul-64 Analysis End time 1-Jul-72 Years of record analysed8 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 27.147 MALF 6.282 ½ median 9.4318.185 3x median 56.58649.11 MAF 448.42 Flow 0 (maximum recorded flow) 647.843 647.843 variability 10 45.49230.31 percentiles 20 31.07622.27 25 (upper quartile flow) 27.70220.571 30 24.86619.179 40 21.47717.504 50 (median flow) 18.86216.37 60 16.96615.362 70 15.59514.396 75 (lower quartile flow) 14.91313.92 80 14.24713.481 90 12.85812.305 91 12.66212.107 92 12.4311.906 93 12.15111.635 94 11.82211.359 95 11.43410.978 96 10.910.607 97 10.37810.209 98 9.99.871 99 8.5718.567 100 (minimum recorded flow) 7.500 (estimate) 7.500 (estimate)
Statistical analysis of river flow data in the Horizons Region 296
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 73.887 disturbance MAF/median 23.774 indicators FRE3 (floods/year or season) 7.4996.549 STD Annual FRE3 2.3293.188 Mean Days of Accrual (days) 44.01741.161 STD Accrual (days) 49.22139.19 Min Accrual (days) 55 Max Accrual (days) 324180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 297
4.5.48. Whanganui at Piriaka (sim consent) (8005), Jul-1973 to Jul-1983 (1972 rules)
Site Whanganui at Piriaka (sim consent)
Time series Data Start Time 28-Nov-72 details Data End Time 25-Dec-83 Analysis Start time 1-Jul-73 Analysis End time 1-Jul-83 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 26.435 MALF 9.63 ½ median 9.5328.464 3x median 57.18950.781 MAF 465.99 Flow 0 (maximum recorded flow) 776.704 776.704 variability 10 41.71728.324 percentiles 20 30.26621.304 25 (upper quartile flow) 27.23920.037 30 24.88319.209 40 21.29517.997 50 (median flow) 19.06316.927 60 17.55615.974 70 16.22215.017 75 (lower quartile flow) 15.55614.612 80 14.89414.217 90 13.51913.121 91 13.33512.98 92 13.14412.827 93 12.93512.666 94 12.70612.468 95 12.42412.267 96 12.15612.057 97 11.81411.801 98 11.28811.383 99 10.57210.582 100 (minimum recorded flow) 7.500 (estimate) 7.500 (estimate)
Statistical analysis of river flow data in the Horizons Region 298
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 48.389 disturbance MAF/median 24.445 indicators FRE3 (floods/year or season) 8.25.441 STD Annual FRE3 2.7772.693 Mean Days of Accrual (days) 40.93851.629 STD Accrual (days) 44.10944.83 Min Accrual (days) 56 Max Accrual (days) 230180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 299
4.5.49. Whanganui at Piriaka (sim consent) (8005), Jul-1984 to Jul-1992 (1983 rules)
Site Whanganui at Piriaka (sim consent)
Time series Data Start Time 25-Dec-83 details Data End Time 1-Sep-92 Analysis Start time 1-Jul-84 Analysis End time 1-Jul-92 Years of record analysed8 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 26.722 MALF 9.288 ½ median 9.1448.401 3x median 54.86450.403 MAF 488.12 Flow 0 (maximum recorded flow) 699.035 699.035 variability 10 43.65729.896 percentiles 20 29.78121.665 25 (upper quartile flow) 26.17420.034 30 23.77719.126 40 20.14117.885 50 (median flow) 18.28816.801 60 16.85215.911 70 15.70615.063 75 (lower quartile flow) 15.15314.624 80 14.5514.173 90 13.26513.126 91 13.11412.995 92 12.95912.848 93 12.77712.676 94 12.55812.468 95 12.27712.19 96 11.94811.813 97 11.53611.425 98 11.05710.939 99 10.2110.104 100 (minimum recorded flow) 7.500 (estimate) 7.500 (estimate)
Statistical analysis of river flow data in the Horizons Region 300
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 52.554 disturbance MAF/median 26.691 indicators FRE3 (floods/year or season) 9.2497.303 STD Annual FRE3 4.2353.03 Mean Days of Accrual (days) 35.83837.853 STD Accrual (days) 36.47434.18 Min Accrual (days) 55 Max Accrual (days) 186134
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 301
4.5.50. Whanganui at Piriaka (sim consent) (8005), Jul-1993 to Jul-2003 (Planning Tribunal 1990)
Site Whanganui at Piriaka (sim consent)
Time series Data Start Time 1-Sep-92 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-93 Analysis End time 1-Jul-03 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 29.371 MALF 11.082 ½ median 9.7878.934 3x median 58.71953.601 MAF 673.71 Flow 0 (maximum recorded flow) 940.346 812.504 variability 10 46.61533.893 percentiles 20 32.8324.331 25 (upper quartile flow) 28.93522.006 30 26.12220.65 40 22.07518.998 50 (median flow) 19.57317.867 60 17.96216.734 70 16.49115.609 75 (lower quartile flow) 15.79115.073 80 15.08614.576 90 13.7113.507 91 13.54513.371 92 13.37213.228 93 13.18813.087 94 12.98912.918 95 12.75612.711 96 12.49912.467 97 12.21612.205 98 11.85711.877 99 11.38611.402 100 (minimum recorded flow) 7.500 (estimate) 7.500 (estimate)
Statistical analysis of river flow data in the Horizons Region 302
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 60.793 disturbance MAF/median 34.42 indicators FRE3 (floods/year or season) 8.77.654 STD Annual FRE3 3.334.901 Mean Days of Accrual (days) 37.28733.804 STD Accrual (days) 39.96338.186 Min Accrual (days) 55 Max Accrual (days) 180166
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 303
4.5.51. Whanganui at Te Maire (33302), Jul-1962 to Jul-2004 (all data)
Site Whanganui at Te Maire
Time series Data Start Time 29-Jun-62 details Data End Time 11-Apr-05 Analysis Start time 1-Jul-62 Analysis End time 1-Jul-04 Years of record analysed42 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 77.791 MALF 22.538 ½ median 26.21118.945 3x median 157.263113.67 MAF 902.06 Flow 0 (maximum recorded flow) 1801.4 1393.6 variability 10 152.392102.593 percentiles 20 103.67368.409 25 (upper quartile flow) 90.43859.371 30 80.0952.897 40 64.09244.134 50 (median flow) 52.42137.89 60 43.47233.335 70 36.30330.179 75 (lower quartile flow) 33.2328.655 80 30.81726.571 90 25.02621.86 91 24.29321.335 92 23.61520.724 93 22.92720.067 94 22.04719.483 95 21.07118.785 96 19.92818.076 97 18.78417.224 98 17.4816.051 99 15.28114.301 100 (minimum recorded flow) 11.57311.573
Statistical analysis of river flow data in the Horizons Region 304
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 40.024 disturbance MAF/median 17.208 indicators FRE3 (floods/year or season) 8.5478.298 STD Annual FRE3 2.9414.385 Mean Days of Accrual (days) 37.69533.468 STD Accrual (days) 42.11733.203 Min Accrual (days) 55 Max Accrual (days) 298160
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 305
4.5.52. Whanganui at Te Maire (33302), Jul-1962 to Jul-1972 (pre-diversion)
Site Whanganui at Te Maire
Time series Data Start Time 29-Jun-62 details Data End Time 28-Nov-72 Analysis Start time 1-Jul-62 Analysis End time 1-Jul-72 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 95.383 MALF 28.802 ½ median 35.325.114 3x median 211.797150.684 MAF 824.78 Flow 0 (maximum recorded flow) 1152.8 1152.8 variability 10 182.853134.49 percentiles 20 129.69393.691 25 (upper quartile flow) 114.10482.128 30 102.14573.571 40 84.77760.486 50 (median flow) 70.59950.228 60 58.96443.564 70 48.98738.32 75 (lower quartile flow) 44.93636.254 80 41.04833.7 90 32.99628.965 91 32.19628.567 92 31.26728.004 93 30.24526.791 94 29.59424.502 95 28.63222.969 96 27.09621.898 97 23.41121.18 98 21.54820.441 99 20.28619.761 100 (minimum recorded flow) 16.90616.906
Statistical analysis of river flow data in the Horizons Region 306
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 28.636 disturbance MAF/median 11.683 indicators FRE3 (floods/year or season) 7.0997.656 STD Annual FRE3 2.334.012 Mean Days of Accrual (days) 46.15536.205 STD Accrual (days) 51.21833.819 Min Accrual (days) 55 Max Accrual (days) 324180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 307
4.5.53. Whanganui at Te Maire (33302), Jul-1973 to Jul-1983 (1972 rules)
Site Whanganui at Te Maire
Time series Data Start Time 28-Nov-72 details Data End Time 25-Dec-83 Analysis Start time 1-Jul-73 Analysis End time 1-Jul-83 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 68.499 MALF 17.425 ½ median 24.18117.123 3x median 145.086102.735 MAF 803.41 Flow 0 (maximum recorded flow) 1349.8 1349.8 variability 10 132.57783.251 percentiles 20 92.71358.142 25 (upper quartile flow) 82.39951.43 30 73.87846.576 40 59.69239.56 50 (median flow) 48.36234.245 60 40.31529.23 70 33.1524.18 75 (lower quartile flow) 29.78522.047 80 26.19319.954 90 19.07116.778 91 18.51416.437 92 17.92815.94 93 17.24115.448 94 16.64615.038 95 15.85614.695 96 15.18114.23 97 14.72213.796 98 14.12213.363 99 13.34913.019 100 (minimum recorded flow) 11.57311.573
Statistical analysis of river flow data in the Horizons Region 308
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 46.107 disturbance MAF/median 16.612 indicators FRE3 (floods/year or season) 8.47.052 STD Annual FRE3 2.7523.032 Mean Days of Accrual (days) 38.8839.302 STD Accrual (days) 47.68436.145 Min Accrual (days) 55 Max Accrual (days) 292159
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 309
4.5.54. Whanganui at Te Maire (33302), Jul-1984 to Jul-1992 (1983 rules)
Site Whanganui at Te Maire
Time series Data Start Time 25-Dec-83 details Data End Time 1-Sep-92 Analysis Start time 1-Jul-84 Analysis End time 1-Jul-92 Years of record analysed8 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 66.76 MALF 17.938 ½ median 22.36416.37 3x median 134.18198.217 MAF 862.92 Flow 0 (maximum recorded flow) 1217 998.551 variability 10 130.23184.533 percentiles 20 87.9156.246 25 (upper quartile flow) 76.34350.278 30 67.55445.281 40 54.15237.733 50 (median flow) 44.72732.739 60 37.17428.806 70 31.46625.269 75 (lower quartile flow) 28.94124.078 80 26.22423.163 90 22.32920.342 91 21.83319.947 92 21.3219.521 93 20.79619.128 94 20.15318.795 95 19.48218.404 96 18.90918.091 97 18.32717.838 98 17.88417.327 99 17.21216.633 100 (minimum recorded flow) 14.25514.255
Statistical analysis of river flow data in the Horizons Region 310
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 48.106 disturbance MAF/median 19.293 indicators FRE3 (floods/year or season) 9.3748.562 STD Annual FRE3 3.2471.772 Mean Days of Accrual (days) 34.53332.816 STD Accrual (days) 35.14828.997 Min Accrual (days) 56 Max Accrual (days) 186104
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 311
4.5.55. Whanganui at Te Maire (33302), Jul-1993 to Jul-2004 (Planning Tribunal 1990)
Site Whanganui at Te Maire
Time series Data Start Time 1-Sep-92 details Data End Time 1-Dec-04 Analysis Start time 1-Jul-93 Analysis End time 1-Jul-04 Years of record analysed11 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 79.34 MALF 24.938 ½ median 24.1818.58 3x median 145.077111.477 MAF 1180.8 Flow 0 (maximum recorded flow) 1801.4 1393.6 variability 10 153.509103.103 percentiles 20 99.19966.126 25 (upper quartile flow) 84.51457.366 30 73.35851.375 40 58.20643.318 50 (median flow) 48.35937.159 60 40.79233.526 70 34.90131.256 75 (lower quartile flow) 32.76730.515 80 31.22729.797 90 28.64327.426 91 28.22627.109 92 27.78626.846 93 27.36326.511 94 26.9126.103 95 26.3925.611 96 25.74325.163 97 25.09324.65 98 24.3124.008 99 23.49923.446 100 (minimum recorded flow) 19.81421.68
Statistical analysis of river flow data in the Horizons Region 312
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 47.349 disturbance MAF/median 24.417 indicators FRE3 (floods/year or season) 9.3628.054 STD Annual FRE3 2.9694.302 Mean Days of Accrual (days) 32.47632.731 STD Accrual (days) 35.77337.413 Min Accrual (days) 55 Max Accrual (days) 177160
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 313
4.5.56. Whanganui at Te Maire (sim natural) (33300), Jul-1962 to Jul-2003 (all data)
Site Whanganui at Te Maire (sim natural)
Time series Data Start Time 1-Jul-62 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-62 Analysis End time 1-Jul-03 Years of record analysed41 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 90.417 MALF 27.949 ½ median 32.79224.768 3x median 196.752148.608 MAF 882.34 Flow 0 (maximum recorded flow) 1769.3 1313.1 variability 10 169.113113.776 percentiles 20 118.87580.589 25 (upper quartile flow) 105.08272.238 30 94.26765.728 40 77.93156.251 50 (median flow) 65.58449.536 60 55.93543.664 70 47.98738.525 75 (lower quartile flow) 44.22536.026 80 40.48133.417 90 32.46228.987 91 31.7128.498 92 30.92827.796 93 30.08427.063 94 29.17826.122 95 28.1625.286 96 26.82224.333 97 25.36123.132 98 23.54621.702 99 21.42420.115 100 (minimum recorded flow) 13.50513.505
Statistical analysis of river flow data in the Horizons Region 314
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 20.648 disturbance MAF/median 13.454 indicators FRE3 (floods/year or season) 7.8536.73 STD Annual FRE3 2.5923.857 Mean Days of Accrual (days) 42.21739.907 STD Accrual (days) 46.64837.012 Min Accrual (days) 55 Max Accrual (days) 292180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 315
4.5.57. Whanganui at Te Maire (sim natural) (33300), Jul-1962 to Jul-1972 (pre-diversion)
Site Whanganui at Te Maire (sim natural)
Time series Data Start Time 1-Jul-62 details Data End Time 28-Nov-72 Analysis Start time 1-Jul-62 Analysis End time 1-Jul-72 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 95.532 MALF 28.966 ½ median 35.39125.093 3x median 212.346150.558 MAF 783.05 Flow 0 (maximum recorded flow) 1121.3 1121.3 variability 10 183.023133.746 percentiles 20 129.80793.659 25 (upper quartile flow) 114.29182.182 30 102.25673.65 40 84.9960.402 50 (median flow) 70.78250.186 60 59.12243.501 70 49.15738.297 75 (lower quartile flow) 45.00736.332 80 41.14933.846 90 33.21629.008 91 32.43828.579 92 31.5328.097 93 30.49227.076 94 29.69624.727 95 28.67423.005 96 27.53721.966 97 23.71621.289 98 21.68620.451 99 20.38319.775 100 (minimum recorded flow) 18.2418.24
Statistical analysis of river flow data in the Horizons Region 316
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 27.033 disturbance MAF/median 11.063 indicators FRE3 (floods/year or season) 7.4997.254 STD Annual FRE3 2.83.945 Mean Days of Accrual (days) 44.12237.762 STD Accrual (days) 50.24537.154 Min Accrual (days) 55 Max Accrual (days) 324180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 317
4.5.58. Whanganui at Te Maire (sim natural) (33300), Jul-1973 to Jul-1983 (1972 rules)
Site Whanganui at Te Maire (sim natural)
Time series Data Start Time 28-Nov-72 details Data End Time 25-Dec-83 Analysis Start time 1-Jul-73 Analysis End time 1-Jul-83 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 87.419 MALF 27.475 ½ median 33.69225.272 3x median 202.149151.629 MAF 806.06 Flow 0 (maximum recorded flow) 1313.1 1313.1 variability 10 158.559103.995 percentiles 20 115.22277.565 25 (upper quartile flow) 103.82670.64 30 94.47665.226 40 79.22356.983 50 (median flow) 67.38350.543 60 57.89644.337 70 49.20237.976 75 (lower quartile flow) 44.8935.091 80 40.61532.656 90 31.24127.279 91 30.5426.288 92 29.91225.387 93 28.49324.317 94 26.50123.187 95 25.00722.35 96 23.1921.303 97 22.14120.311 98 21.119.939 99 19.93219.259 100 (minimum recorded flow) 13.50513.505
Statistical analysis of river flow data in the Horizons Region 318
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 29.338 disturbance MAF/median 11.962 indicators FRE3 (floods/year or season) 7.15.843 STD Annual FRE3 2.9582.756 Mean Days of Accrual (days) 47.85748.081 STD Accrual (days) 61.19839.654 Min Accrual (days) 55 Max Accrual (days) 292159
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 319
4.5.59. Whanganui at Te Maire (sim natural) (33300), Jul-1984 to Jul-1992 (1983 rules)
Site Whanganui at Te Maire (sim natural)
Time series Data Start Time 25-Dec-83 details Data End Time 1-Sep-92 Analysis Start time 1-Jul-84 Analysis End time 1-Jul-92 Years of record analysed8 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 85.22 MALF 27.496 ½ median 30.97924.628 3x median 185.874147.765 MAF 872.85 Flow 0 (maximum recorded flow) 1242.1 995.597 variability 10 157.428104.418 percentiles 20 110.33675.751 25 (upper quartile flow) 97.1868.497 30 87.32962.796 40 72.62154.575 50 (median flow) 61.95849.255 60 53.39944.325 70 47.14239.94 75 (lower quartile flow) 43.97237.983 80 40.8635.685 90 34.21631.609 91 33.45231.292 92 32.80330.921 93 32.21130.43 94 31.44929.893 95 30.72929.375 96 29.66928.872 97 28.82428.072 98 27.72327.182 99 26.3125.916 100 (minimum recorded flow) 18.08318.083
Statistical analysis of river flow data in the Horizons Region 320
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 31.745 disturbance MAF/median 14.088 indicators FRE3 (floods/year or season) 8.3747.049 STD Annual FRE3 3.8153.033 Mean Days of Accrual (days) 39.80639.324 STD Accrual (days) 42.38232.91 Min Accrual (days) 55 Max Accrual (days) 186134
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 321
4.5.60. Whanganui at Te Maire (sim natural) (33300), Jul-1993 to Jul-2003 (Planning Tribunal 1990)
Site Whanganui at Te Maire (sim natural)
Time series Data Start Time 1-Sep-92 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-93 AnalysisEnd time 1-Jul-03 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 93.253 MALF 28.797 ½ median 31.86625.288 3x median 191.193151.725 MAF 1166.3 Flow 0 (maximum recorded flow) 1769.3 1225.2 variability 10 175.615117.77 percentiles 20 118.77881.761 25 (upper quartile flow) 103.30172.948 30 91.74766.176 40 75.45956.732 50 (median flow) 63.73150.575 60 54.64244.267 70 47.37738.793 75 (lower quartile flow) 43.59736.203 80 40.03433 90 32.23528.397 91 31.48327.846 92 30.65827.391 93 29.83826.83 94 29.02226.292 95 28.01225.676 96 27.06825.14 97 26.04324.619 98 25.0724.016 99 23.98423.354 100 (minimum recorded flow) 20.94720.947
Statistical analysis of river flow data in the Horizons Region 322
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 40.501 disturbance MAF/median 18.3 indicators FRE3 (floods/year or season) 7.67.25 STD Annual FRE3 1.8934.749 Mean Days of Accrual (days) 40.89534.591 STD Accrual (days) 41.67237.771 Min Accrual (days) 55 Max Accrual (days) 178162
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 323
4.5.61. Whanganui at Te Maire (sim consent) (8005), Jul-1962 to Jul-2003 (all data)
Site Whanganui at Te Maire (sim consent)
Time series Data Start Time 1-Jul-62 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-62 AnalysisEnd time 1-Jul-03 Years of record analysed41 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 73.464 MALF 25.153 ½ median 24.65117.336 3x median 147.906104.016 MAF 835.05 Flow 0 (maximum recorded flow) 1721.7 1265.5 variability 10 140.38589.402 percentiles 20 96.47160.737 25 (upper quartile flow) 84.35953.544 30 74.82148.078 40 60.25540.088 50 (median flow) 49.30234.672 60 41.00629.998 70 34.21529.129 75 (lower quartile flow) 31.14929.088 80 29.22329.047 90 29.04528.665 91 29.02828.098 92 29.0127.5 93 28.88726.692 94 28.09125.879 95 27.20625.094 96 26.07924.169 97 24.82223.028 98 23.17721.646 99 21.15320.11 100 (minimum recorded flow) 13.50513.505
Statistical analysis of river flow data in the Horizons Region 324
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 278.35 disturbance MAF/median 16.937 indicators FRE3 (floods/year or season) 8.6587.321 STD Annual FRE3 2.5043.941 Mean Days of Accrual (days) 37.57536.989 STD Accrual (days) 41.25535.749 Min Accrual (days) 55 Max Accrual (days) 291180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 325
4.5.62. Whanganui at Te Maire (sim consent) (8005), Jul-1962 to Jul-1972 (pre-diversion)
Site Whanganui at Te Maire (sim consent)
Time series Data Start Time 1-Jul-62 details Data End Time 28-Nov-72 Analysis Start time 1-Jul-62 Analysis End time 1-Jul-72 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 78.073 MALF 25.776 ½ median 27.28918.028 3x median 163.731108.165 MAF 735.43 Flow 0 (maximum recorded flow) 1073.7 1073.7 variability 10 151.807106.123 percentiles 20 106.04371.93 25 (upper quartile flow) 92.83862.465 30 82.21255.462 40 67.11943.959 50 (median flow) 54.57736.055 60 44.59730.471 70 35.96628.961 75 (lower quartile flow) 32.29128.911 80 29.37828.861 90 28.91928.559 91 28.928.111 92 28.88127.392 93 28.86225.351 94 28.70223.99 95 27.88722.642 96 25.59421.835 97 23.1621.191 98 21.59420.409 99 20.3419.754 100 (minimum recorded flow) 17.93818.24
Statistical analysis of river flow data in the Horizons Region 326
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 28.532 disturbance MAF/median 13.475 indicators FRE3 (floods/year or season) 7.9997.859 STD Annual FRE3 2.4064.197 Mean Days of Accrual (days) 40.83534.87 STD Accrual (days) 42.28335.553 Min Accrual (days) 55 Max Accrual (days) 237180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 327
4.5.63. Whanganui at Te Maire (sim consent) (8005), Jul-1973 to Jul-1983 (1972 rules)
Site Whanganui at Te Maire (sim consent)
Time series Data Start Time 28-Nov-72 details Data End Time 25-Dec-83 Analysis Start time 1-Jul-73 Analysis End time 1-Jul-83 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 71.041 MALF 24.857 ½ median 25.22717.721 3x median 151.362106.326 MAF 759.88 Flow 0 (maximum recorded flow) 1265.5 1265.5 variability 10 132.45781.974 percentiles 20 94.22358.764 25 (upper quartile flow) 84.23152.437 30 75.7947.733 40 61.65340.572 50 (median flow) 50.45435.442 60 42.1230.452 70 34.9629.118 75 (lower quartile flow) 31.62629.082 80 29.00529.045 90 28.81627.267 91 28.79826.289 92 28.63925.391 93 27.26324.318 94 25.93323.198 95 24.45822.356 96 22.9821.308 97 21.88320.313 98 20.61119.939 99 19.72419.254 100 (minimum recorded flow) 13.50513.505
Statistical analysis of river flow data in the Horizons Region 328
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 30.57 disturbance MAF/median 15.061 indicators FRE3 (floods/year or season) 8.56.447 STD Annual FRE3 3.1322.964 Mean Days of Accrual (days) 39.11943.75 STD Accrual (days) 49.20338.182 Min Accrual (days) 57 Max Accrual (days) 291159
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 329
4.5.64. Whanganui at Te Maire (sim consent) (8005), Jul-1984 to Jul-1992 (1983 rules)
Site Whanganui at Te Maire (sim consent)
Time series Data Start Time 25-Dec-83 details Data End Time 1-Sep-92 Analysis Start time 1-Jul-84 Analysis End time 1-Jul-92 Years of record analysed8 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 68.451 MALF 24.6 ½ median 23.09517.202 3x median 138.567103.209 MAF 825.23 Flow 0 (maximum recorded flow) 1194.5 947.978 variability 10 129.30680.077 percentiles 20 88.76156.127 25 (upper quartile flow) 76.99950.338 30 68.37545.563 40 55.38638.827 50 (median flow) 46.18934.403 60 38.89130.231 70 33.60729.039 75 (lower quartile flow) 30.95729.01 80 29.01628.982 90 28.87828.924 91 28.86428.919 92 28.8528.913 93 28.83628.907 94 28.82228.901 95 28.80828.677 96 28.32828.022 97 27.56727.413 98 26.56226.45 99 25.22825.311 100 (minimum recorded flow) 18.08318.083
Statistical analysis of river flow data in the Horizons Region 330
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 33.546 disturbance MAF/median 17.866 indicators FRE3 (floods/year or season) 8.7497.806 STD Annual FRE3 3.2822.498 Mean Days of Accrual (days) 37.336.229 STD Accrual (days) 39.10831.778 Min Accrual (days) 65 Max Accrual (days) 186123
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 331
4.5.65. Whanganui at Te Maire (sim consent) (8005), Jul-1993 to Jul-2003 (Planning Tribunal 1990)
Site Whanganui at Te Maire (sim consent)
Time series Data Start Time 1-Sep-92 details Data End Time 1-Jul-03 Analysis Start time 1-Jul-93 Analysis End time 1-Jul-03 Years of record analysed10 Gaps in the data (% of record). None
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 75.926 MALF 25.461 ½ median 23.50217.434 3x median 141.012104.601 MAF 1118.7 Flow 0 (maximum recorded flow) 1721.7 1177.6 variability 10 146.42492.317 percentiles 20 95.73861.113 25 (upper quartile flow) 81.57353.428 30 71.60847.794 40 57.00440.166 50 (median flow) 47.00434.867 60 39.4630.086 70 33.40429.139 75 (lower quartile flow) 30.34429.081 80 29.16129.024 90 28.94228.24 91 28.92127.761 92 28.89927.313 93 28.42526.746 94 27.71726.238 95 27.02425.669 96 26.28625.14 97 25.52624.605 98 24.65924.031 99 23.70223.285 100 (minimum recorded flow) 20.94720.947
Statistical analysis of river flow data in the Horizons Region 332
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 43.938 disturbance MAF/median 23.8 indicators FRE3 (floods/year or season) 9.17.654 STD Annual FRE3 2.4664.901 Mean Days of Accrual (days) 33.62232.756 STD Accrual (days) 35.24937.889 Min Accrual (days) 55 Max Accrual (days) 163161
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 333
4.5.66. Whanganui at Te Porere (33347), Jul-1966 to Jul-2001 (all data)
Site Whanganui at Te Porere
Time series Data Start Time 13-Jan-66 details Data End Time 4-Jul-01 Analysis Start time 1-Jul-66 Analysis End time 1-Jul-01 Years of record analysed35 Gaps in the data (% of record). 0
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 1.37 MALF 0.816 ½ median 0.5760.559 3x median 3.4533.354 MAF 30.34 Flow 0 (maximum recorded flow) 51.596 51.596 variability 10 1.8311.665 percentiles 20 1.5211.401 25 (upper quartile flow) 1.431.335 30 1.3581.279 40 1.2441.189 50 (median flow) 1.1511.118 60 1.0741.056 70 1.0060.992 75 (lower quartile flow) 0.9750.968 80 0.9460.935 90 0.8710.855 91 0.8590.839 92 0.8480.825 93 0.8340.809 94 0.8160.792 95 0.7950.773 96 0.7690.757 97 0.7480.733 98 0.7070.703 99 0.6560.672 100 (minimum recorded flow) 0.5090.509
Statistical analysis of river flow data in the Horizons Region 334
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 37.181 disturbance MAF/median 26.36 indicators FRE3 (floods/year or season) 5.9715.123 STD Annual FRE3 3.3823.501 Mean Days of Accrual (days) 59.26451.182 STD Accrual (days) 65.346.503 Min Accrual (days) 55 Max Accrual (days) 419180
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 335
4.5.67. Kai Iwi at Handley Rd (33502), Jul-1978 to Jul-2004 (all data)
Site Kai Iwi at Handley Rd
Time series Data Start Time 5-Apr-78 details Data End Time 4-Apr-05 Analysis Start time 1-Jul-78 Analysis End time 1-Jul-04 Years of record analysed26 Gaps inthe data (% of record). 0.1
Season1 July to 30 June1 Nov to 30 April
Flow Flow Statistic Flow (m³/s) Flow (m³/s) magnitude Mean 1.485 MALF 0.525 ½ median 0.4990.391 3x median 2.9942.343 MAF 27.102 Flow 0 (maximum recorded flow) 70.326 70.326 variability 10 2.6441.598 percentiles 20 1.7391.155 25 (upper quartile flow) 1.5151.062 30 1.3580.989 40 1.1420.868 50 (median flow) 0.9980.781 60 0.8840.71 70 0.7780.654 75 (lower quartile flow) 0.7280.628 80 0.6810.599 90 0.5910.533 91 0.580.525 92 0.5690.517 93 0.5560.509 94 0.5430.501 95 0.5280.491 96 0.5140.481 97 0.4990.468 98 0.4790.449 99 0.450.416 100 (minimum recorded flow) 0.1780.178
Statistical analysis of river flow data in the Horizons Region 336
Season 1 July to 30 June 1 Nov to 30 April
Biological MAF/MALF 51.33 disturbance MAF/median 27.156 indicators FRE3 (floods/year or season) 9.6547.439 STD Annual FRE3 2.1163.255 Mean Days of Accrual (days) 33.82137.059 STD Accrual (days) 38.02937.054 Min Accrual (days) 55 Max Accrual (days) 216167
Seasonal Distribution of Mean Monthly Flows
Statistical analysis of river flow data in the Horizons Region 337