Napier City Council’s stormwater system consists of open watercourses, stormwater pipes, sumps, and pump stations that carry rainwater to the ocean. About 75% of Napier relies on pumping systems for stormwater drainage.
Plantation Watercourse
Stormwater from Maraenui currently discharges into the Plantation Drain, which then flows north through a series of pump stations into the Ahuriri Estuary. Upgrading all the stormwater infrastructure along Plantation Drain to handle increased storm intensity is unlikely to be cost-effective. Instead, Napier City Council has proposed redirecting high level flows for a portion of the Plantation Drain catchment south, through Te Awa into Te Matau-o-Māui Hawke Bay.
The project involves reversing the storm level flow in a portion of the Plantation Drain southwards into the Te Awa Serpentine Pond and adding additional stormwater treatment to improve water quality.
Te Awa Pump Station
Development and intensification in Te Awa and Maraenui will increase stormwater run-off, necessitating upgrades to the stormwater system in the area.
A new stormwater pump station (with backup generator) and outfall is proposed to manage stormwater in the Te Awa Serpentine Pond, which will connect with the Maraenui catchment via the plantation watercourse upgrade.
*Project costs are estimates.
Lagoon Farm is the area north of Prebensen Drive, bordered by the airport and the expressway.
This project will involve constructing wetland treatment areas to improve water quality before it is released back to the Ahuriri Estuary.
From the Ahuriri Estuary and Coastal Edge Masterplan, focus was given to developing a Regional Park on the site. The Lagoon Farm Strategy for Future Land Use was developed along with the Napier City Stormwater Masterplan, which was informed by the Napier City Council Stormwater Model Build Report.
*Project costs are estimates.
The Napier City Council Stormwater Master Plan identified the Taradale Road and Herrick Street culverts as being undersized to handle the volume of stormwater in the Napier Central catchment.
The existing culverts along the Georges Drive watercourse (the old Tutaekuri Riverbed) beneath Taradale Road (State Highway 51) and Herrick Street will be replaced and upsized. Enlarging the culverts will increase their ability to move stormwater away from the city.
Both culverts are planned for construction simultaneously. The Herrick culvert has completed the design stage, while the Taradale culvert is currently in the design stage.
*Project costs are estimates.
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