DEVELOPMENT AND APPLICATION OF 2-PARAMETERS MONTHLY WATER BALANCE MODEL IN LIMITED DATA SITUATION, THE CASE OF ABAYACHAMO BASIN, ETHIOPIA

Abstract

A monthly water batance model which can be used
to generate runoff with few parameters is
developed. The model is particularly useful for
simulating runoff in cases of limited
hydrometeorological and physical data, and where
climatic conditions lead to low or large rainfall
variations, like in temperate ,or semi-arid regions
respectively. The model is used to simulate the
runoff of 8 sub-catchments of the Abaya and
Chamo Lakes drainage in the Rift -Valley Lakes
Basin of Ethiopia. The results of both calibration
and validation show the modetperforms acceptably
well and can be used to generate runofffor similar
catchments like the study area considered.