Journal of Environmental Hydrology

	Journal of Environmental Hydrology ISSN 1058-3912
	Electronic Journal of the International Association for Environmental Hydrology JEH Volume 15 (2007), Paper 7 Posted March 16, 2007 DEVELOPMENT OF REGIONAL EQUATIONS FOR ESTIMATION OF LOW FLOW REGIMES OF SMALL CATCHMENTS ON PEMBA ISLAND, ZANZIBAR *C.F. Mhilu* Department of Energy Engineering, Dar es Salaam University, Dar es Salaam, Tanzania *ABSTRACT* This paper describes the application of a multiple regression technique to the development of regional equations for the estimation of low flow regimes for ungauged catchments. The major goal was to establish the level of low flow indices in ungauged catchments found on Pemba Island where favorable features for developing small scale hydropower projects exist. The approach adopted made use of various combinations of physical catchment characteristics data for small gauged catchments covering an area ranging from 20 to 100 km² similar to the two catchments found in Pemba. The derived regression models allowed an estimate of the low flow regimes for the catchments of interest. The accuracy of the calculated low flow indices determined from the developed regional models for each of the eight small catchments was verified using a statistical analysis technique that yielded the highest coefficients of determination (R²) corresponding to the lowest values of the standard error (Se). These results indicate that low flow regimes can be modeled with reasonably good results using regional equations developed here. Reference: Mhilu, C.F. 2007. Development of regional equations for estimation of low flow regimes of small catchments on Pemba Island, Zanzibar. Journal of Environmental Hydrology, Vol. 15, Paper 7. CONTACT: C.F. Mhilu Department of Energy Engineering Dar es Salaam University P.O. Box 35131 Dar es Salaam, Tanzania E-mail: cfmhilu@hotmail.com
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