Abstract
The development of watershed basins to increase groundwater recharge potential is becoming a major issue in India due to an acute shortage of groundwater resources, resulting from the marked expansion of land-use activities and the explosive growth in population. It is necessary to study the regional characteristics in order to identify potential artificial groundwater recharge zones. A combination of morphometric analysis coupled with hydrogeological information is used to prepare a generalized scenario for watershed development plans. A numerical scheme is, thus, proposed for the relative evaluation of surface rock-permeability in relation to morphometry (stream order, stream length, drainage density, channel maintenance, overland flow, basin shape, etc.). An attempt is made, from the morphometrical studies of the Varaha watershed of the Precambrian Eastern Ghats basement terrain in Eastern India, to illustrate how the numerical scheme is helpful as a tool in watershed development planning programs. This method involves the designation of various recharge-related measures, based upon the relative ranking of surface-material permeability after comparison with the hydrogeological conditions of sub-basins of the river basin. The scheme can also help to pin-point areas of study on a local scale, and thus facilitate developmental programs to augment groundwater recharge.
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