Highlights, News

Rainwater harvesting policy adopted following Sponge City project, Kenya

In November and December 2020, a concise outcome / impact measurement was carried out as follow up on the Sponge City project in Kajiado (Kenya). The project was implemented between 16th March 2017 and 30th March 2019. It was funded by VIA Water and supported by RAIN, a brand of Aidenvironment. Further project partners included Acacia Water, Neighbours Initiative Alliance (NIA), County Government of Kajiado, AMREF (K), Maasai Technical Training Institute (MTTI) and the Sasol Foundation.

The outcome / impact measurement consisted of water level measurements, a household survey on water quality and costs and several interviews with stake holders. Due to the limited extent of the exercise no definite conclusions could be drawn. The sample size to draw conclusions with regards to water costs was too small. Impact on water levels could not be determined, due to the lack of long-term data. The water quality seems not to have improved, nor deteriorated.

Constructed weir to allow surface water to infiltrate and recharge the ground water.

The first envisaged outcome has been partially achieved, however: The Sponge City model is known, applied, promoted, and brought to scale: proof of principle.

  • Most of the interviewed stakeholders – politicians and high-level county employees in the departments of water, irrigation, environment and natural resources, as well as public works and planning – knew the concept of sponge cities and its benefits; this outcome was not surprising since these high-level county employees, were involved in the project.
  • A stronger impact can be seen in the policies developed within the project period. The most significant adopted policy is the rainwater harvesting policy.


For more information, please contact Niels Lenderink