Geophysical characterisation of aquifer and minimisation of impact of urban environment in Vidyadhar Nagar township of Jaipur, India

摘要

Resistivity surveys in about 3.5 sq km barren land of Vidyadhar Nagar area in Jaipur, Rajasthan (India) in year 1985 produced some interesting results leading to the development of glorious township having high-rise housing complex, multiplex, civil structures, etc. Resistivity survey revealed the presence of potential aquifer saturated with good quality drinking water in the study area. Isopach map of aquifer thickness obtained by resistivity sounding exhibits a nala-type structure along Udak-Raniji Ki Bavri-Ambabari with increasing thickness towards the south. The cross-section of this nodal zone of aquifer shows that its thickness is about 95m in header side in Udak area in the north. Its thickness increases to about 127m and the span is narrowed in its footer side in Ambabari area in the south. Thereafter it appears to be merged with the Amanishah-Ka-Nala. This nala-type feature in aquifer appears to be an ancient branch which has turned its course towards east in Udak area and joins with the Amanishah-Ka-Nala to the north of Vidyadhar RHB colony, as it exists today.Impact of urban environment causes imbalance of groundwater budget due to cementing of ground surface vis-avis decrease in percolation and simultaneous increase in pumping of groundwater due to urbanisation. Check-dam at header position of nodal zone of aquifer at Udak branch of nala for harvesting of rainwater drained from adjacent hill and harvesting of rainwater flowing from roof, road, other cemented grounds, etc. would help in balancing the recharge and discharge of groundwater in the