Author(s) :

Adesiji, A. R., Jimoh, O. D..

Volume/Issue :

Abstract :

This paper presents the estimation of runoff in an ungauged watershed in Chanchaga River Basin in Guinea Savannah region using semi arid moisture balance technique (SAMBA). The SAMBA model is a single layer soil water balance model that estimates daily surface runoff using daily rainfall, evapotranspiration, vegetal cover and soil moisture deficit (SMD). The model estimate was validated with discharge measurements taken in 2009 and 2010 with a rectangular weir across a stream at the outlet of the basin. Annual runoff for the year 2009 was 167.7 mm, which is 14.5% of the annual rainfall of 1157.1 mm. Maximum runoff occurred on 1st September, coinciding with the high rainfall that occurred between 29th August and 1st September. Similar result was obtained for the year 2010. It was also found that SMD was as high as 49.8 mm during the dry season. The result is useful in understanding and management of water resources in the region.

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