During this study, the Soil and Water Assessment Tool (SWAT) was used to assess the impacts of area hydrology between baseline and alternative scenario (upscaling of rainwater harvesting technologies). Specifically, the overall objective was to quantitatively evaluate the effects of land use changes on watershed hydrology in the upper Ewaso Ngiro North basin in Kenya. This was achieved by estimating hydrological responses under historical land use scenarios obtained from the multi-temporal satellite images of 1987, 1995 and 2003.