Stormwater

​We own, operate and manage the stormwater catchment and reticulation network in urban areas and open drainage in rural areas. The management of this network is done internally while the maintenance is delivered through a combination of in-house staff and external contractors.

Our assets include 133.8km of pipeline, 2418 manholes, 240km public drains, 1101 connections, 153 soakholes and silt traps, 27 outlets and 29 trenches & retention ponds.

How it works

The purpose of the Stormwater drainage system is to prevent flooding of properties and roads, and to control erosion by collecting and discharging stormwater resulting from moderate rainfall events into streams and other watercourses.

An integrated combination of measures is used to manage the effects of stormwater runoff.  These include:

Primary stormwater system

The Primary Stormwater System of pipes, culverts, soak holes and channels is designed to minimise nuisance flooding by collecting and discharging stormwater from moderate rainfall events into streams and other watercourses.

Secondary stormwater system

Includes overland flow paths through private property and along roadways the Secondary Stormwater System designed to convey excess stormwater with a minimum of damage when the Primary Stormwater System is overloaded. The provision of secondary flow paths recognises that it is impractical to provide a Primary System which can cope with extreme rainfall events.

Provision of designed Secondary Stormwater Systems is a comparatively recent practice in New Zealand and there are areas within the District served by a stormwater system where secondary flow paths were not provided when the areas were developed.

Land drainage

There are 240km of unlined open drainage channels in the district regarded as Public Drains which, along with the larger natural watercourses, form the backbone of the district’s Land Drainage system. 

For more information on land drainage in Waipa download our Land Drainage Information Brochure.​​

We provide a regulatory and advisory service in relation to these channels, the majority of work funded directly by landowners. An exception to this is where we have resource consents, historic agreements in place, or flood protection that requires active involvement. 

These exceptions include:

  • Te Kawa Drainage Area - Administered by Otorohanga District.  Council is committed to meeting its share of works in the small area inside Waipa District
  • Puniu River - Committed to maintenance of willow re-growth
  • Mangapiko - Committed to stream channel works to prevent flooding in the Te Awamutu urban area
  • Lake Ngaroto - Resource consent for control of lake level for recreational use
  • The Rotomanuku, Fencourt and Hautapu drainage areas in the District are controlled by Waikato Regional Council.  
Page reviewed: 02 Dec 2014 9:50am