HR: 08:00h
AN: H51E-05    [Abstracts]
TI: Artificial Recharge Sites Identification In A Typical Semi-Arid Terrain Of Progressively Lowering Groundwater Levels
AU: * Bekkam, V
EM: cwr_jntu@yahoo.com
AF: Centre for Water Resources, IST, JNT University, Kukatpally, Hyderabad, 500085, India
AB: Shamshabad basin of Ranga Reddy district, Andhra Pradesh (A.P) is one of the severe drought prone areas in the Telangana region of A.P. India. The basin is about 159 km2. The average annual rainfall is about 740mm. At present the basin is experiencing severe drought conditions due to over exploitation of groundwater, in spite of normal rainfall for several years. Integrated investigations such as Hydrogeomorphological investigations and hydrogeophysical investigations were carried out in the basin to identify artificial recharge sites, water and soil conservation sites to improve the groundwater levels. Traditionally artificial recharge sites are identified by remote sensing method by preparing various thematic maps such as hydrogeomorphological map, slope map, drainage map etc. However this method may not throw much light on the depth to basement, which is very much essential in identifying the artificial recharge sites. Therefore in addition to the thematic mapping by using IRS LISS III data, 32 vertical electrical soundings were carried out in the basin delineating the aquifer resistivity and depth to basement. By integrating all these studies artificial recharge sites were identified in such a way that, the drainage map is overlaid on the slope map, the drainage pattern and slope of watershed is carefully studied and then Check dams are located where the ground is fairly level after steeper slopes on the upstream side and where the drainage path is nearly straight on a moderate Pediplain. At this location it is verified that whether the basement depth is sufficient or not and also verified whether the aquifer formation is amenable to recharge or not by studying the aquifer resistivity and groundwater levels. All together three check dams sites were identified in addition to afforestration and vegetative barriers and field bunding at some places
DE: 1829 Groundwater hydrology
DE: 1830 Groundwater/surface water interaction
SC: Hydrology [H]
MN: 2007 Joint Assembly