Hydrogeomorphic Classification of the Terrain in Relation to the Aquifer Disposition: a Case Study from Gurgaon-Sohna Region, Haryana

Hydrogeomorphic classification of the terrain in Gurgaon-Sohna region has been arrived at using satellite images. Four morphological units have been identified as rocky tract, pediment, alluvial tract and the sand dune tract. While the rocky tract composed of mainly quartzite is characterized by its drainage and water bodies, which are controlled by geological structure; the pediment forms a fringe surrounding the rocky tract. The alluvial tract occupies either the narrow valley fill or the extensive plain. The alluvial plain has been partly covered by sand dune tract, which consists of dunal ridges and interdunal depressions. The interdunal depressions at places are the sites of water bodies. Groundwater movement is from the rocky tract and the dunal ridges towards the valley fill and follows, in general, the topography. The aquifer panel diagram indicates that the aquifer disposition is in relation to the morphological setting ofthe region. The geothermal gradient around the Sohna hot water spring shows that the major joints in the rocky tract have directional control over the aquifer system formed in the alluvial plain and the valley fill.