3.2.5.7 - Resource security and welfare in a regional setting
Use water in the Orange–Senqu drainage basin to connect physical availability, unequal demand, human welfare and attempts to manage a shared regional resource.
Basin boundary and water system
This regional case is the Orange–Senqu drainage basin, rather than the whole territory of each country sharing it.
The ORASECOM IWRM brochure describes a basin of 972,783 km² encompassing all Lesotho and parts of Botswana, Namibia and South Africa. Highlands in the east supply substantial headwater runoff; much of the basin towards the west is drier, with high evaporative demand. The river reaches the Atlantic along the Namibia–South Africa boundary. Water availability therefore changes along a connected physical system.
| Location or connection | Role in the case |
|---|---|
| Lesotho highlands | Headwater catchments and LHWP donor reservoirs |
| Senqu/Orange main river | Connects upstream flows to downstream users and the Atlantic |
| Vaal system | Tributary system and major industrial/urban demand connection |
| Ash–Wilge route | LHWP delivery connection into the Vaal system |
| Namibia–South Africa lower river | Downstream ecological and user interests |
| Botswana's basin area | Included in regional cooperation; not all Botswana |
This locational table establishes real connections without inventing an exact basin outline. A GIS investigation would combine a verified licensed catchment layer with dated settlements, rainfall, abstractions and monitoring sites. Clip evidence to the actual catchment; national averages are proxies, not basin observations. A source's map may be consulted without assuming permission to reproduce its pixels. ORASECOM 2015–2024 plan brochure.
Security pressures and connections
Regional pressure arises from the mismatch between water's location and timing and the needs of connected users.
Domestic and urban services, industry, irrigation and ecosystems compete for quantity and quality. Transfers support recipients beyond their own catchment inflow, but create dependence on donor rainfall, infrastructure and rules. Upstream abstraction or storage can change downstream availability; agricultural and industrial return flows can impair quality even when volume is returned.
The plan's comparison of about 11,500 million m³ naturalised mean annual runoff with less than 4,000 million m³ after demands and management illustrates large pressure. It is a planning/modelled comparison under different conditions, not a measured before-and-after experiment. It must not be described as a directly observed 7,500 million m³ loss caused by one project.
The 2014 diagnostic analysis reports approximately 14.3 million people in the basin and a wider transfer-supported population of about 19 million. These are historic context, not current population estimates, and the two figures refer to different boundaries. Security must be examined through present dated data before claiming a current shortage or improvement. ORASECOM 2014 diagnostic analysis.
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