Gateri, Magdalene Wanjiku*, Opere Alfred Owuor** and Gitau Wilson**
*Kenya Meteorological Department, **Department of Meteorology, University of Nairobi
Gateri, Magdalene Wanjiku
P.o. Box (01000) 1371 Thika, Kenya.
(Received 1 April 2016, Received in revised form 4 July 2016, Accepted 1 August 2016)
AbstractThis study investigated the potential of Rain Water Harvesting (RWH) in Kilifi, Taita Taveta and Mombasa counties in the Coastal region of Kenya. Monthly rainfall and evaporation data from 1980-2012 for the stations within the three Counties was obtained from Kenya Meteorological Department (KMD), other data from Kenya integrated household budget of survey (KIHBS) was used to get information. Data quality control was conducted, time series analysis applied, determination of harvestable water both rooftop and surface runoff in the three Counties and also determination of storage volumes that could satisfy the demand level of each area. Results indicated that harvestable volume of water was sufficient to satisfy the minimum water demand levels of the people in the Coastal region, during the dry seasons. Consequently, the total runoff harvestable during the October, November and December (OND) season in Taita-Taveta was 6,121.2 m3 while in Kilifi County, during the April, May and June (AMJ) season was 12,301.6 m3. Thus, if both rooftop and surface runoff harvesting is well incorporated and implemented, the coastal region could no longer suffer water insecurity or water scarcity. Considering coefficient of variation which was found to be 30%, a reservoir to store excess volume of rain water was determined.
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