The government must ensure temporary shelters are available, and have adequate supplies, before asking residents to move, Interfaith Network says.
The Auditor-General paints a troubling picture of mismanagement and misappropriation of emergency funds in several northern Kenyan counties.
Ruto also declared that Friday, May 10, is a public holiday to remember Kenyans adversely affected by climate change.
The government has taken measures to mitigate the flood effects to ensure safety and support to affected populations.
The Chief Officer of Disaster Management reiterated the government's commitment to minimising disruptions for Nairobians during this challenging period.
The residents questioned the selective nature of the evacuations, pointing out disparities in treatment between slum dwellers and other residents facing similar risks.
A total of 174 people have been reported wounded, 75 missing, and 47,000 families, or 235,000 people, displaced.
The government must also take care of its people beyond issuing cautionary statements.
County Coordinator Daud Ahmed noted that with the River Tana flooding, more water could flow to parts of Garissa and Tana River counties.
The public health department noted the potential for diarrhoea outbreaks, largely attributed to the consumption of contaminated food and water.
Farmers appealed to the government for immediate support for household sustainability, support to rehabilitate farms, and replanting.
Ruto also announced those affected by the floods in the Kiamaiko area will be given priority for the 5,000 affordable housing units that will be put up in Mathare in a bid to have them settled permanently.
More however remain trapped in the Sintaan area in Marigat where efforts to rescue over 230 households are ongoing.
Planners say as towns have expanded and construction of buildings over time have reduced space for rainwater to sip into the ground.
Business people in Garissa town say they are unable to restock their empty shelves as the Garissa-Nairobi highway has been cut off.
The government says the programme will specifically target flood victims and allocations will be made on a first-come, first-served basis, ensuring immediate relief for those most in need.
Mandera, Nairobi, Nakuru, Kajiado and Homabay are the worst hit counties by the ongoing floods.
The assessment from the county also revealed that three villages in Kamukunji have reported diarrhoea cases.
Over 153 households were displaced, with more than 120 toilets destroyed, raising concerns of potential waterborne diseases.
