6. Water Resource Inventory
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Water Resource Inventory Prepared for Maniapoto Māori Trust Board July 2014 Authors/Contributors: Christian Zammit For any information regarding this report please contact: Christian Zammit Hydrologist Hydrological Processes +64-3-343 7879 [email protected] National Institute of Water & Atmospheric Research Ltd 10 Kyle Street Riccarton Christchurch 8011 PO Box 8602, Riccarton Christchurch 8440 New Zealand Phone +64-3-348 8987 Fax +64-3-348 5548 NIWA Client Report No: CHC2014-093 Report date: July 2014 NIWA Project: MMT14302 © All rights reserved. This publication may not be reproduced or copied in any form without the permission of the copyright owner(s). Such permission is only to be given 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. Whilst NIWA has used all reasonable endeavours to ensure that the information contained in this document is accurate, NIWA does not give any express or implied warranty as to the completeness of the information contained herein, or that it will be suitable for any purpose(s) other than those specifically contemplated during the Project or agreed by NIWA and the Client. Contents Executive summary ..................................................................................................... 6 1 Introduction ........................................................................................................ 7 2 Methodology ....................................................................................................... 8 3 Water Resource Inventory ................................................................................. 9 3.1 Physiographic characteristics ...................................................................... 9 3.2 Climate ...................................................................................................... 13 3.3 Water Resource Information - Taranaki ..................................................... 18 3.4 Water Resource Information – Manawatu-Whanganui .............................. 22 3.5 Water Resource Information – Waikato ..................................................... 29 4 Summary ........................................................................................................... 41 5 Glossary of abbreviations and terms .............................................................. 42 6 References ........................................................................................................ 43 Tables Table 3-1: Name and location of existing rainfall stations. 14 Table 3-2: Flow statistics (mean flow, median flow and 7day-MALF) estimated by National Hydrological model (TopNet) and WRENZ at reach 0600011 19 Table 3-3: Flow statistics (mean flow, median flow and 7day-MALF) estimated by National Hydrological model (TopNet) and WRENZ at reach 06000471 22 Table 3-4: Flow statistics (mean flow, median flow and 7day-MALF) estimated by National Hydrological model (TopNet) and WRENZ at reach 07005855. 24 Table 3-5: Flow statistics (mean flow, median flow and 7day-MALF) estimated by National Hydrological model (TopNet) and WRENZ at Ohura River reach 07005708. 26 Table 3-6: Flow statistics (mean flow, median flow and 7day-MALF) estimated by National Hydrological model (TopNet) and WRENZ at reach 07005207. 29 Table 3-7: Flow statistics (mean flow, median flow and 7day-MALF) estimated by National Hydrological model (TopNet) and WRENZ at reach 03020932. 32 Table 3-8: Flow statistics (mean flow, median flow and 7day-MALF) estimated by National Hydrological model (TopNet) and WRENZ at reach 03020932. 34 Water Resource Inventory Table 3-9: Flow statistics (mean flow, median flow and 7day-MALF) estimated by National Hydrological model (TopNet) and WRENZ at reach 03042468. 37 Table 3-10: Flow statistics (mean flow, median flow and 7day-MALF) estimated by National Hydrological model (TopNet) and WRENZ at reach 03043401. 40 Figures Figure 3-1: Location of Maniapoto Rohe land. 10 Figure 3-2: Proposed hydrological management boundary for the Maniapoto Rohe. 11 Figure 3-3: Land Use. 12 Figure 3-4: Location of rain gauge (blue water drop symbols) and towns (orange diamonds). 13 Figure 3-5: VCSN stations (yucca yellow dots). 15 Figure 3-6: Average annual precipitation estimated across the period 1966-2006. 16 Figure 3-7: Annual evaporation estimated across the period 1966-2006.. 17 Figure 3-8: VCSN daily precipitation and air temperature for the Ongarue River (reach ID: 07005207). 18 Figure 3-9: Location of the Water Resource Inventory for Mohakatino River (06000011) and Tongaporutu River (06000471). 20 Figure 3-10: Monthly flows and associated 95 % confidence interval, mean flow estimated by TopNet (Qann) and WRENZ (Qann_WRENZ) for Mohakatino River reach 06000011. 21 Figure 3-11: Monthly flows and associated 95 % confidence interval, mean flow estimated by TopNet (Qann) and WRENZ (Qann_WRENZ) for Tongaporutu River reach 06000471. 22 Figure 3-12: Location of the Water Resource Inventory for Tangarakau River (07005855). 23 Figure 3-13: Monthly flow and associated 95% confidence interval, mean flow estimated by TopNet (Qann) and WRENZ (Qann_WRENZ) for Tangarakau River reach 07045855. 24 Figure 3-14: Location of the Water Resource Inventory for Ohura River (07005708). 25 Figure 3-15: Monthly flow and associated 95% confidence interval, mean flow estimated by TopNet (Qann) and WRENZ (Qann_WRENZ) for Ohura River reach 07005708. 27 Figure 3-16: Location of the Water Resource Inventory for Ongarue River (07005207). 28 Figure 3-17: Monthly flow and associated 95% confidence interval, mean flow estimated by TopNet (Qann) and WRENZ (Qann_WRENZ) for reach 07005207. 29 Figure 3-18: Location of the Water Resource Inventory for Waipā River (03020932). 31 Figure 3-19: Monthly flow and associated 95% confidence interval, mean flow estimated by TopNet (Qann) and WRENZ (Qann_WRENZ) for Waipā River reach 03020932. 32 Figure 3-20: Location of the Water Resource Inventory for Marokopa River (03030336). 33 Water Resource Inventory Figure 3-21: Monthly flow and associated 95% confidence interval, mean flow estimated by TopNet (Qann) and WRENZ (Qann_WRENZ) for Marokopa River reach 03030336. 34 Figure 3-22: Location of the Water Resource Inventory for Awakino River (03042268). 36 Figure 3-23: Monthly flow and associated 95% confidence interval, mean flow estimated by TopNet (Qann) and WRENZ (Qann_WRENZ) for Awakino River reach 03042468. 37 Figure 3-24: Location of the Water Resource Inventory for Mōkau River (03043401). 39 Figure 3-25: Monthly flow and associated 95% confidence interval, mean flow estimated by TopNet (Qann) and WRENZ (Qann_WRENZ) for Mōkau River reach 03043401. 40 Reviewed by Approved for release by Roddy Henderson Charles Pearson Water Resource Inventory 5 Executive summary The aim of this project is to develop a Water Resource Inventory (WRI) for the Maniapoto Rohe. Only existing information derived from regional council and national datasets was considered (i.e. no new data were gathered). For sake of spatial consistency, the WRI is based on the analysis of the discharge estimated by NIWA’s un-calibrated national hydrological model. In order to validate the results from the hydrological model it is recommended to calibrate the hydrological model at the location of the different observed gauging information. The calibration/validation will then be used to verify the modelled discharge prediction and to modify accordingly the findings of the WRI. Based on the information collected there are a number of surface water and groundwater consents currently set within the Rohe land area. The current level of consented abstraction and level of allocation of the water resource for each water system is provided hereafter: . Mohakatino: no consented abstractions . Tongaporutu: no consented abstractions . Tangarakau: no consented abstractions . Ohura: 3 consented abstractions . Ongarue: 7 consented abstractions . Waipā: 40 consented abstractions: fully allocated . Marokopa: 3 consented abstractions but nearly fully allocated . Awakino: 2 consented abstractions but nearly fully allocated . Mōkau: 8 consented abstractions and two-thirds allocated Water Resource Inventory 6 1 Introduction The aim of this project is to develop a Water Resource Inventory (WRI) for the Maniapoto Rohe. Maniapoto Māori Trust Board needs further information related to water resources in order to inform its beneficiaries of the potential for land development. The methodology for this project is to develop the WRI based on existing information provided by regional council as well as national datasets. The WRI identifies . Each water body within the management boundary of the Trust and its management authority; . Geographical and physiographical description of each water body; . Current information regarding management of the water resource; . Size of the water resource; and . Amount of the water resource currently used and its use. Water Resource Inventory 7 2 Methodology The WRI is based on existing information such as . Water resource information available from Taranaki, Horizons and Waikato regional councils including length of record and relevance of flow and rain information; . Ministry for Environment Water Allocation Snapshot database (MfE, 2010); . NIWA’s Water Resource Explorer; . Existing climate, surface water and groundwater stations; . NIWA’s National Hydrological model. All water consent and water use data in this