Parts of earthquake-ravaged Christchurch flooded again last week, closely following February and March floods that are expected to cost insurers $NZ25 million ($23.1 million).

The Insurance Council of New Zealand (ICNZ) reported the cost of the earlier events last week.

Excesses have started to rise after some properties were flooded for the third time in two months, partly due to land levels dropping in the 2011 earthquakes and liquefaction silting up waterways.

ICNZ CEO Tim Grafton told insuranceNEWS.com.au no insurer has withdrawn capacity from the region, but excesses for flood have grown to $NZ10,000 ($9238).

He says some areas of Christchurch will flood again and engineering solutions are at least two years away.

Christchurch City Council is working on proposals such as widening creeks that have narrowed due to silting and installing extra pumping stations.

Mr Grafton says storms from March 4-5 caused insured losses of $NZ21.9 million ($20.23 million).

“While this storm system also hit Wellington and Hawke’s Bay, the brunt of the damage, totalling $NZ19.6 million ($18.11 million), was in Canterbury, where there was extensive flooding in Christchurch.”

The Canterbury damage included home and contents losses of $NZ13.4 million ($12.38 million), commercial claims of $NZ2.8 million ($2.59 million) and motor claims of $NZ2.5 million ($2.31 million).

A February hailstorm in Canterbury caused $NZ3.3 million ($3.05 million) of insured damage.