IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 32nd Congress - Venice (2007) : THEME A: Engineering and Management of Fresh-water Systems : Maximizing reservoir yield in an arid region
Maximizing reservoir yield in an arid region
Author : David Stephenson
In an arid country such as Botswana the evaporative loss of water from storage reservoirs on rivers can be greater than the reliable yield. Therefore attempts to minimize evaporation losses must be made. Apart from selecting dams to minimize surface area and covering water surfaces the operational policy can minimize evaporation loss. This requires drawing down water levels as much as possible without increasing the risk of running dry. Operating rules were drafted after modelling the system of four major dams and optimizing operating rules. The principle requires to be able to transfer water between centres if local sources run dry. Groundwater resources should only be exploited when surface reservoirs are drawn down. Then an average aquifer draft within the sustainable yield is feasible. Artificial recharge of groundwater is receiving attention as groundwater storage mimimizes evaporation. The porosity of the Kalahari sands is often low so that geophysical searching for porous aquifers has become a necessity.
File Size : 203,803 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 32nd Congress - Venice (2007)
Article : THEME A: Engineering and Management of Fresh-water Systems
Date Published : 01/07/2007
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