3.5.10 Implementation Methods - Drainage Water Discharges
184.108.40.206 Permitted Activity Rule – Take, Diversion and Discharge of Water Pumped from Drainage and Flood Control Schemes
The take, diversion and discharge of pumped water to water from drainage districts and river control schemes lawfully established or authorised before the date of notification of this Plan (28 September 1998) is a permitted activity subject to the following conditions:
- Any erosion occurring as a result of the discharge shall be remedied as soon as practicable.
- The discharge shall not exacerbate the effects of flooding on properties downstream of the discharge point except in accordance with approved scheme design.
- The discharge shall not result in the lowering of water levels in any wetlands1 that are areas of significant indigenous vegetation and/or significant habitats of indigenous fauna.
- The discharge shall not cause dissolved oxygen to fall below 80 percent of saturation concentration. If the concentration of dissolved oxygen in the receiving water body is below 80 percent, the discharge shall not lower it further.
- The discharge shall comply with the suspended solids standards in Section 220.127.116.11.
- The discharge shall not contain any material which will cause the production of conspicuous oil or grease films, scums or foams, or floatable suspended materials at any point downstream that is a distance greater than three times the width of the stream at the point of discharge.
- The activity shall not disturb any archaeological site or waahi tapu as identified at the date of notification of this Plan, in any district plan, in the NZ Archaeological Association’s Site Recording Scheme, or by the Historic Places Trust except where Historic Places Trust approval has been obtained
- In the event of any waahi tapu that is not subject to condition g) being identified by the Waikato Regional Council to the person undertaking the activity, the activity shall cease insofar as it may affect the waahi tapu. The activity shall not be recommenced without the approval of the Waikato Regional Council.
- Where a waahi tapu site is identified whilst undertaking the activity, the process that Waikato Regional Council will follow in order to implement condition h) is set out in Section 18.104.22.168 of this Plan.
22.214.171.124 Controlled Activity Rule – Take, Diversion and Discharge of Water Pumped from Existing Drainage and Flood Control Schemes
The take, diversion and discharge of pumped drainage and floodwater to water from drainage districts and river control schemes lawfully established or authorised before the date of this plan (28 September 1998) that does not comply with or is not permitted by Rule 126.96.36.199 is a controlled activity (requiring resource consent).
Waikato Regional Council reserves control over the following matters:
- Measures to prevent erosion or scour at the point of the discharge
- Measures to prevent flooding effects on properties downstream of the discharge point, which have not been addressed by the scheme design approval process.
- Measures to prevent adverse effects on any wetland that is an area of significant indigenous vegetation or habitat of significant indigenous fauna2.
- Measures to ensure the discharge does not adversely affect the receiving water body in a manner which is inconsistent with the relevant Water Management Classes identified in Section 3.2.4
188.8.131.52 Discretionary Activity Rule – Discharge of Pumped Drainage Water
The take, diversion and discharge of pumped drainage and floodwater to water that does not comply with, or is not permitted by Rule 184.108.40.206 or Rule 220.127.116.11 is a discretionary activity (requiring resource consent).
- Information requirements to enable the assessment of any application under this Rule are as set out in Section 18.104.22.168 of this Plan. In addition, assessment shall also take into account the matters identified in the policies in Section 3.2.3 of this Plan.
Explanation and Principal Reasons for Adopting Methods 22.214.171.124 to 126.96.36.199
There are a large number of floodwater discharges associated with flood control scheme works in the Waikato Region. These include the Lower Waikato/Waipa Control Scheme, the Waihou Valley Scheme, the Piako River Scheme, some small scale private floodwater schemes and emergency discharges. Water is actively managed under these schemes to prevent flooding of land. The schemes include the discharge of flood drainage water from floodgates and pumps.
In accordance with Policy 1, Rule 188.8.131.52 allows the discharge of flood and drainage water from existing schemes provided that a number of conditions are met. In particular, the discharge of water shall not cause flooding or erosion, lower any water levels in significant wetlands and lakes, and shall not cause the production of oils, greases, scums and foams. These conditions provide an appropriate level of environmental protection. Where existing schemes do not meet these conditions they must be authorised by controlled activity Rule 184.108.40.206. The controlled status of this rule recognises the often significant infrastructure involved in such schemes and the fact that land users make decisions based on the continued existence of these schemes. Takes, diversions and discharges associated with new schemes will need to be authorised by discretionary activity Rule 220.127.116.11.