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The Heathcote River has breached its banks in places, causing some road closes, Christchurch City Council says.
The Flockton Basin area, flooded three times in less than two months, is again under water in many places.
Flood-waters on roads and parks may be contaminated, the council has warned.
Residents are being advised to avoid the water where possible or to wash their hands and remove and wash any clothing that gets wet.
Drivers have been asked to slow down when driving through flooded areas as vehicle wake can send waves into homes and businesses.
Extra care needs to be taken when driving on Cressy Terrace/Park Terrace, Lyttelton due to slips.
Geotechnical consultants are monitoring known risk areas.
"The council is asking people in hillside areas to be vigilant, and keep an eye out for any telltale signs of land instability, including new cracking to land, buildings, driveways or paths; existing cracks that get longer, wider or deeper; leaning or bulging of retaining walls; or rockfalls.
If anyone notices changes, or has concerns, they are being urged to call the council's call centre on 941 8999, or 0800 800 169.
Road closure information is continually changing. For up-to-date traffic information throughout Christchurch city and Banks Peninsula, please visit the Transport for Christchurch website at www.transportforchristchurch.govt.nz
Road closures covered by temporary traffic management:
Whareoa Terrace (slip)
Fitzgerald Avenue Northbound left lane closed
Owles Terrace Pages Road Collingwood Street
Aylesford Street, Hills-Westminster
Flockton Street, Warrington Street-Westminister Street
Fifield Terrace St Martins Road to Beckford Road
Richardson Terrace McKenzie-Opawa
Clarendon Terrace - Sheldon-Opawa
Aynsley Terrace - Garlands-Centaurus
Riverlaw Terrace Armstrong Avenue - Tennyson Street
Eastern Terrace - Birdwood Avenue to Waltham Road
Waimea Terrace Colombo Street Birdwood Avenue
Hunter terrace Colombo to Malcolm Avenue
Deans Ave Riccarton Road Moorehouse Avenue
Little River Road
Martindales Road -
Warrington Street, Hills-Barbadoes
Barbados Street- adjacent to Edward Avenue
Edward Avenue Barbados to Geraldine street
Summit Road, Sign of the Kiwi to Gebbies Pass
Brittan Terrace Above the port is open to light vehicles only
Western Valley Road Little River to Port Levy
State Highway 75/Hilltop Road Cooptown to Barrys Bay