With the arrival of the rainy season, Kenya is facing the usual challenges of flooding and disease. As Derek Kilner reports from Nairobi, there is a particular risk for the hundreds of thousands living in displacement camps as a result of post-election violence.

A Kenyan child waits for rations near food distribution point at IDP camp near Kenya's lakeside town of Naivasha, 28 Feb 2008

Nyanza province, near Lake Victoria in the country's west, has also been hit hard. A cholera outbreak there has killed 39 people.

Rainfall has been low compared to recent years, and the damage from flooding has not been particularly severe. But relief officials say they are concerned by the threat to the people living in Kenya's displacement camps.

Political and ethnic violence following December's disputed presidential elections caused hundreds of thousands to flee their homes, with 200,00 staying in camps.

Anthony Mwangi of the Kenya Red Cross Society, says camp residents, particularly children, are at risk from heavy rain.

A two-year-old Kenyan boy, plays inside a tent in a camp for internally displaced people set up in Nairobi's Mathare slum, 08 Feb 2008

The rains have been a particular concern for camps around the Rift Valley town of Nakuru, where residents have been relocated to higher ground. But if strong rains continue, there could be increasing problems elsewhere. The largest concentration of camps is in the Rift Valley and around the capital, Nairobi.

Mwangi says the Kenya Red Cross is urging the government to take steps to allow IDPs to return to their homes.

"We would like very much for these guys to go back to their homes and be resettled as quickly as possible. It is not conducive for them to stay on any extra day in these IDP camps. But there are complex issues that have to be addressed first before they go back to their land," he said.

Many of those displaced belonged to ethnic minorities in their communities, and had their homes attacked by members of other tribes, often neighbors. Many IDPs say the government must take steps to ensure security before they will be willing to return.

Special Programs Minister Naomi Shaaban, who is in charge of resettlement policy, has said the government requires more money to implement programs, but has given little indication of what the timeline might look like.