About 70 residents of Selwyn Huts have been asked to evacuate as rising river levels threaten to cut off access to the settlement.
Selwyn District Council is also telling Sheffield, Waddington and Springfield residents to self evacuate if they concerns, as surface flooding affects significant areas of the township.
Selwyn Civil Defence was going door-to-door on Sunday afternoon requesting residents to "evacuate now", as flooding of the Selwyn River was expected to cut off access to the settlement via Days Rd.
They said a flood flow breakout above the huts and over the road was "very likely to occur in this event".
Resident Robby Hyde lives in the Upper Huts and said they expected the river to rise up the huts later this afternoon.
The notice from Civil Defence said the road would be closed after the evacuation order, until it was safe for residents to return.
They asked evacuating residents to secure their homes, turn off power, water and gas, and take enough medicines and personal items for a two to three-night stay.
A community-led emergency centre has also been opened at the Darfield Recreation Centre.