Design and assessment of borewell recharge technique for groundwater enhancement and recharge in assured rainfall zone of Marathwada Region

Recharging of borewells using designed filtration system was studied since 2014 on 14 borewells locations in assured rainfall zone of Marathwada region. As the specific gravity of soil is basic property and primary requisite for determination of velocities of silt contained water, it has been determined by pycnometer test and found to be 2.66. Using stokes, law, the depth of filtration material was designed and filtration efficiency was found to be in range of 93 to 96%. A long duration pumping test was conducted on representative bore well. The well characteristics like specific yield and transmissivity were determined as 0.0134 and 572.37 m2/day, respectively. The results revealed that the water level fluctuation in pre monsoon and post monsoon season in recharged bore wells are found to be in the range of 5.90 to 8.84 m. The ground water recharge in treated bore well was found to be 23.28% of annual rainfall as against 5.56% in untreated bore wells. The rise in water level in recharged bore well is found to be 2.37 m as compared to fall of 0.62 m water level in un-recharged bore wells during May 2015 to May 2016.