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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/12172

Title: Assessing sediment inputs to small reservoirs in Upper East Region, Ghana
Authors: Adwubi, Afua
Amegashie, Bright Kofi
Agyare, W. A.
Tamene, Lulseged
Odai, Samuel Nii
Quansah, Charles
Vlek, Paul
Keywords: bathymetric survey
Ghana
sediment yield
siltation
small reservoirs
Issue Date: Oct-2009
Publisher: Lakes & Reservoirs Research & Management
Citation: Lakes & Reservoirs Research & Management, 14(4):279 - 287
Abstract: Many small dams and dugouts have been constructed in the Upper East Region of Ghana to address the problem of regional water scarcity. The reservoirs were constructed primarily as water supplies for agricultural irrigation and livestock watering, aquaculture and domestic use. However, many of the reservoirs dry up during the dry season, affecting the livelihoods of their basin inhabitants. A major cause for the dried reservoirs is siltation, which reduces the reservoir’s storage capacities. The goal of this study is to quantify the annual siltation rate of four study reservoirs, using a bathymetric survey and reservoir soil sampling. The sediment yield and its relation to catchment area also were assessed. The results of this study indicate that the annual siltation rates are 1272, 3518, 2764 and 6135 t year)1 for Doba, Dua, Zebilla and Kumpalgogo reservoirs, respectively. Analyses of the sediment yield and catchment areas illustrated that the sediment yields decreased with increasing catchment area. All the study reservoirs have lost their dead storage capacity, which was meant to store sediment until the end of their anticipated design lives. The decreasing storage capacity because of siltation will affect the livelihoods of the local basin inhabitants, as the reservoirs will not be able to achieve all their intended purposes. The results of this study indicate that, because siltation is not the only factor threatening the benefits gained from the reservoirs, the integrated assessment of all relevant factors is required.
Description: This article is published in Lakes & Reservoirs Research & Management and also available at DOI: 10.1111/j.1440-1770.2009.00410.x
URI: 10.1111/j.1440-1770.2009.00410.x
http://hdl.handle.net/123456789/12172
Appears in Collections:College of Agric and Natural Resources

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