Hydrological investigations were carried out for a possible dam on the Thune river in Eastern Botswana. The main motivation for constructing the dam was to provide an alternative to depleting groundwater resources to surrounding villages. The space boundary of the project was confined to the project area and within Botswana. Use of reservoirs in arid areas increases the risk of drought compared with temperate areas. This is because flows are more variable and water has to be stored longer. Risks also arise due to siltation, cracking, decommissioning, poor hydrological data and economic viability.
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