Groundwater Recharge Assessment for the Kalahari Catchment of North-eastern Namibia and North-western Botswana with a Regional-scale Water Balance Model

• Published in: Water resources management Vol. 22; no. 9; pp. 1143 - 1158
• Main Authors: Wanke, Heike, Dünkeloh, Armin, Udluft, Peter
• Format: Journal Article
• Language: English
• Published: Dordrecht Dordrecht : Springer Netherlands 01.09.2008; Springer Netherlands; Springer; Springer Nature B.V
• Subjects: Altitude; Annual variations; Atmospheric Sciences; Civil Engineering; Climatic conditions; Drinking water; Earth and Environmental Science; Earth Sciences; Earth, ocean, space; Environment; Evapotranspiration; Exact sciences and technology; Geotechnical Engineering & Applied Earth Sciences; Groundwater; Groundwater recharge; Groundwater runoff; Hydraulics; Hydrogeology; Hydrology. Hydrogeology; Hydrology/Water Resources; Kalahari; Permeability; Precipitation; Runoff; Studies; Surface runoff; Topography; Vegetation; Water balance; Water resources; Water resources management; Namibia; Botswana; Kalahari Desert; Southern Africa; Africa; Botswana, Kalahari; Modelling; Groundwater recharge; Water balance; Kalahari; Namibia; Botswana; models; time variations; ground water; runoff; ground-water recharge; geographic information systems; vegetation; water balance; evapotranspiration; drainage basins; water resources; aquifers; water resource management; spatial resolution; spatial variations; drinking water; soils
• ISSN: 0920-4741; 1573-1650
• DOI: 10.1007/s11269-007-9217-5

Groundwater is the only source of drinking water for the inhabitants of the Kalahari. Thus understanding spatial and temporal variations in groundwater recharge is very important and a regional-scale water balance model has therefore been set up for a 209,149 km² catchment in north-eastern Namibia and north-western Botswana. The model has a spatial resolution of 1.5 x 1.5 km, daily model time-steps, and climatic input parameters for 19 years are used. The distributed, GIS-based, process-oriented, physical water balance model (MODBIL) used in this study considers the major water balance components: precipitation, evapotranspiration, groundwater recharge, and surface runoff/interflow. Mean precipitation for the study area is 409 mm a⁻¹, while mean actual evapotranspiration is 402 mm a⁻¹ and mean groundwater recharge is 8 mm a⁻¹ (2% of mean annual precipitation). The recharge pattern is mainly influenced by the distribution of soil and vegetation units. Groundwater recharge shows a high inter- and intra-annual variability, but not only the sum of annual precipitation is important for the development of groundwater recharge; a large amount of precipitation in a relatively short period is more important. Published independent data from the Kalahari in Namibia, Botswana and the Southern African region under similar climatic conditions are used to verify the modelling results.