Structure et genèse du Cubango Megafan au Nord de la Namibie: implications hydrogéologiques Estructura y génesis del Cubango Megafan en el norte de Namibia: implicancias para su hidrogeología 纳米比亚北部库邦戈河巨型扇沉积构 和机理:对 水文地质状况的启示 Estrutura e génese do Megaleque do Cubango no norte da Namíbia: implicações para a sua hidrogeologia

• Published in: Hydrogeology journal 2014, Vol.22 (6), p.1307-1328
• Main Authors: Lindenmaier, F, Miller, R, Fenner, J, Christelis, G, Dill, H. G, Himmelsbach, T, Kaufhold, S, Lohe, C, Quinger, M, Schildknecht, F, Symons, G, Walzer, A, van Wyk, B
• Format: Article
• Language: English
• Subjects: aquifers; brackish water; freshwater; groundwater; stratigraphy; water supply
• ISSN: 1431-2174; 1435-0157

An exploration strategy for groundwater was established and followed in the northern Namibian Cuvelai-Etosha Basin (CEB). The data derived from transient electromagnetics, rotary-drilling, coring and sample investigation were used to refine stratigraphy and hydrostratigraphy, and to develop a 3D map of aquifers within the Cubango Megafan. The results have delineated three major aquifers. The newly found, deep-seated Ohangwena II Aquifer (KOH-2) has the potential of providing significant additional water to the water supply of northern Namibia and Angola. While near-surface aquifers carry predominantly brackish water, freshwater in the deep-seated aquifer is further extended and features good hydraulic properties. To date, only a small part of the hydrogeological potential of arid CEB has been explored and an extension of exploration is needed, including southern Angola. The combination of structural, sedimentological and hydrogeological approaches greatly advanced both the geological and hydrogeological understanding. With regard to the deep-seated aquifer, strict measures need to be applied to ensure that the water in the KOH-2 reservoir is exploited sustainably. Water control areas need to be established to ensure long-term preservation of this newly explored aquifer.