National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Assessment of groundwater is an effective tool for proper planned and optimal utilisation of water resources in the context of future national requirement and expected impact of climate changed, its variability is critical for relevant national and regional long term development strategies and sustainable development. Our main purpose for the assessment of groundwater in Patna and Gaya district is to compute a complete evaluation of groundwater resources and produce information that can be incorporated for future requirement.The study was undertaken based on the recommendation of groundwater estimation committee, 1997 (GEC-97). Methodology used the estimation of annual groundwater recharge from rainfall and other sources, including irrigation, water bodies and artificial recharge, determination of present status of groundwater utilization and categorization of assessment units based on the level of groundwater utilization and long-term water level trend. Water level fluctuation techniques and empirical norms were used for recharge estimation. The data collected for investigation were water table fluctuation data, rainfall data cropping pattern, number of groundwater structures, hydrogeology of area, specific yield, groundwater draft, pond area etc. The study computes the following result for Patna District and Gaya District respectively. Total annual groundwater recharge is 91924.33 ha-m and 98648.29 ha-m, net annual replenishable groundwater resource is 82731.93 ha-m and 88783.47 ha-m, groundwater draft for all uses is 47328.6 ha-m and 43140.2 ha-m. The net annual groundwater available for future irrigation development is 35403.325 ha-m and 45643.27 ha-m. The stage of groundwater development is 57.20 % and 48.59 % which falls in safe category for both. The study recommended that there is a good scope for future groundwater development and keeping in view of rapid increase in groundwater draft, roof top rainwater harvesting needs to be taken up to recharge the aquifer in Patna and Gaya district particularly in urban areas.
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