Suitability of SWAT Model for Sediment Yields Modelling in the Eastern Africa - Advances in Data, Methods, Models and Their Applications in Geoscience - page 266

Rainfall stations

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Flows stations

Koka Reservoir

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Mojo Flow Gauge St.

Rivers

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Hombole Fl Ga St

T T Koka Reservoir

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N

W E

S

50 0 50 100 Miles

Fig. 1b. A location map of Case study 1, Koka Reservoir catchment (KRC), as adopted from
Endale(2008)

The catchment has a warm tropical savannah climate with an average temperature of about
23 o C. The total average annual precipitation varies between 700 and 800 mm/annum. The
mean annual wind speed is 1.60 m/s. The SRC is considered to be one of the main
contributors to the deterioration of water quality ( i.e ., sediments and nutrients) in the Lake
Victoria. This is because of its relatively large size, its large inflow contribution and its many
agricultural activities using agrochemicals which generate high yields of sediments.