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[Sedimentation surveys play a critical role in the management of reservoirs. They not only give information on current volumes but also records of past sedimentation status. Determining the sedimentation status of reservoirs provides a means of generating multifunctional historical datasets on sedimentation rates, thus explaining the nexus of water, soil and food and its impacts on water quantity and quality in reservoirs over time. Historical sedimentation rates, as demonstrated from assessments carried out in two reservoirs in Kenya, can inform management of reservoirs and watersheds where food production is carried out. This could be critical in Sub-Saharan Africa (SSA) where up to 58% of reservoirs are not monitored. A study in Ruiru Reservoir and Lake Sonachi in Kenya demonstrates how critical and missing information about the reservoirs and watersheds could be generated from sedimentation assessment. In the Ruiru Reservoir, which is one of the critical sources of water to Nairobi, information such as current volume and sedimentation rates were obtained. The assessment showed that the reservoir has lost 14% of its original volume at an average sediment accumulation rate of 1.75 cm/year. This information is key to the management of the reservoir and the upstream watershed.]
Published: Nov 11, 2020
Keywords: Reservoirs; Sedimentation; Bathymetric survey; Bathymetric survey system
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