Christchurch City Council

Stormwater (SW) Ōtākaro Avon River Corridor Stopbank Anzac Drive to Waitaki Street (OARC)

The Works for this RFT shall include, but are not limited to:

SP1 – Anzac to Waitaki Flood Protection:

• Sheet‑pile floodwall and embankments – installation of STU2700 sheet piles, core material tie‑ins, toe drains, earth embankments on both sides, and safety barrier along Anzac Drive.
• Stormwater and groundwater infrastructure – new gravity reticulation, swales, debris screen structure, stormwater pump station (3 × 0.5 m³/s pumps), northern groundwater pump station, rising mains, distribution chamber, and river outfall works.
• Roading upgrades – full reconstruction and raising of Wainoni Road to RL 2.92 m, new shared paths/cycle lanes, sump adjustments, and service relocations.
• City to Sea Pathway and access works – 4 m‑wide asphalt pathway on embankment, access tracks, small culvert installations, and tie‑ins to existing routes including Falconwood Grove.
• Landscaping and siteworks – ecological planting, reserve works (incl. Jack Hinton Memorial relocation), architectural electrical building, fencing, contaminated soil handling, earthworks, and site reinstatement.

SP2 – Waitaki Treatment Facility:
• Construction of a stormwater first flush basin that will provide storage and treatment of first flush volume runoff from the adjacent urban catchments.
• Construction of twin stormwater treatment wetlands which, in addition to treating stormwater, will provide ecological benefit by providing habitat for birds and other wildlife.
• Construction of the final length of the upstream piped connection with associated manholes.
• Abandonment of remaining stormwater and wastewater pipes that are in Bexley Road and removal of almost all services that are below the formation level of the stormwater management facility.

Department/Business Unit: Infrastructure