Abstract
Athi basin is one of the five basins which form the drainage pattern of Kenya and occupies about 70, 000 km2 (12% of Kenya's land area). Athi river drains approximately 65% of the basin's area with the remaining area drained by smaller independent streams. The study area lies approximately between latitudes 4° 50'S and 4° 30'S. Like most parts of Kenya, greater part of Athi basin experiences two rainfall regimes also referred to as bimodal rainfall regime, March to May (long rains), October to December (short rains). The coastal strip adjoining Indian Ocean has one long rainy season from April to July with maximum in May.
This paper describes water balance of this area and runoff model of upper Athi basin.
