Session: BRAINSTORMING: GROUND WATER AQUIFER MAPPING- LESSONS LEARNT DECIPHER THE HIGH POTENTIAL AQUIFER FOR DRINKING WATER AND ITS MANAGEMENT - A CASE STUDY By A K Madhukar

INTRODUCTION News highlighted in Rajasthan Patrika edition dated 30/04/2005 about an extinct river at distance 113 Km in north of Jaipur city near Keshwana Rajput village that: The Tube-wells constructed in the area yielding very high discharge It was also highlighted that there will be no question of shortage even after continuous drought of three years due to high potential extinct river. The drawdown of the wells of this area was 2.30 m only after pumping one hour with discharge of 34 lps and water level recovery was 2 meter within 10 minutes. In reconnaissance survey area, it appears that the area has very good potential aquifer system.

Field Investigations Interacted with the local people Observing the local hydrogeological conditions of area Monitoring the groundwater structures in the area Conduced Vertical Electrical Sounding in the area

HYDROGEOLOGY Quartzite, schist, slate, conglomerates, dolomite limestone etc is underlain by Quaternary Alluvium in the Jaipur district The slate is underlain by Alluvium deposit around the study area i.e. Keshwana Rajaput village. The Sota river tributary of Shabi river is flowing just adjoining to the village. The high hill of slate rock trending NE-SW is lying northern part of village and southern part of village is covered by alluvium deposit. The slate beneath the alluvium has identified highly friable and dug-wells have reported the good discharge. Fracture in the slate was also reported at deeper depth near dug well of Keshwana Rajput village The Water level was around 13 to 19 m apx. (Agust-2005) around the village and the WL was declined trend and area at present under overexploited area of Jaipur Kotputli Block

SLATE HILL SOTA INDUSTRIAL AREA

CONCLUSION Two tier aquifer system has been delineated within 100 m depth range. The first aquifer consist of friable and fracture rocks of slate formation forming good aquifer just below the alluvium formation. Second aquifer is alluvium consists of angular gravel formed the good aquifer The high yielding wells are due to these formations The water quality is potable NO EVIDENCE OF EXTINCT RIVER HAS BEEN NOTICED.

AQUIFER MANAGEMENT PLAN Since, the area of alluvium plain is occupied by Sota industrial area. therefore, The industries should be restricted for withdrawing heavy water from these aquifers If, possible rationing of withdrawing the Groundwater should be implemented for industries B. Series of Nala bund on Sota river for arresting the rain water and injection well for recharging both the aquifers. should be constructed

RECOMMONDATION The micro level geophysical as well as hydrogeological surveys are required for better management plan. For identification of such an extinct river, the advance geophysical tools like Heliborne survey is required so that lateral & vertical 3-D model can be prepared for better management

THANKS