ABC People walk through debris resulting from days of heavy rain in the Solomon Islands, which caused flash flooding and the Mataniko River in Honiara to burst its banks, April 4, 2014.

Authorities in Solomon Islands say 23 people have died and 9,000 are homeless following disastrous flash floods, landslides and strong winds.

The Solomon's National Disaster Council says the victims who lost their homes occupying 24 evacuation centres around Honiara.

The National Emergency Operations Centre says the numbers are continuing to increase across all centres.

The director of the National Disaster Management Office, Loti Yates, has raised concerns over sanitation at the evacuation centres, which are lacking proper water supply.

"There is a very real risk of an outbreak of disease - including dyentry, malaria, dengue fever and other diseases related to poor sanitation," Mr Yates said.

The Solmon Islands government has allocated $5million in emergency funds for the relief effort.

Australia and New Zealand have sent aircraft, equipment and specialist teams, as well as money, to assist in the clean up.

Cherise Chadwick from Solomon Islands Red Cross has told Asia Pacific thousands are still in evacuation centres in the capital, Honiara.

"Many of those people are not sure what they're returning back to," she said.

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Solomon Islands floods: Thousands remain in Honiara evacuation centres