By Saeid Eslamian
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Additional info for Handbook of engineering hydrology : environmental hydrology and water management
4a). The planned remedial action is to bring surface water from the overspill of the Nibhana dam and inject it into a few of the wells among the thousand existing ones. The mean rainfall recharge to the aquifer was estimated with an infiltration coefficient of rainfall of 5% determined by Kamenski’s method applied to triple wells aligned along a flow line and monitored every month (aquifer recharge calculated from the rise in its level after a rain event). Luckily, because of the weak permeability of the water bearing layers, the saltwater intrusion has not progressed very far.
Basin closure and issues of scale: The Southern African hydropolitical complex. International Journal of Water Resources Development, 24(2), 305–318. 47. , and Rascher, J. 2008. Setting the scene: Hydropolitics and the development of the South African economy. R. ) Reflections on Water in South Africa, Special Edition of International Journal of Water Resource Development, 24(3), 319–323. 48. UNEP. 2002. Vital Water Graphics: An Overview of the State of the World’s Fresh and Marine Waters. Nairobi, Kenya: United Nations Environment Program (UNEP).
These tanks are called percolation tanks and are thus artificially created surface water bodies submerging a highly permeable land area so that the surface runoff is made to percolate and recharge the groundwater storage. Normally, a percolation tank should not retain water beyond February in the Indian context. It should be located downstream of a runoff zone, preferably toward the edge of a piedmont zone or in the upper part of a transition zone (land slope between 3% and 5% points). There should be adequate area suitable for irrigation near a percolation tank.