Present study aims to evaluate performance analysis of modified recharge well (RW) technique of the Managed aquifer Recharge (MAR) models for rain water from rooftop of office building and that of runoff water from Kharoil Beel (Swamp) harvesting approach in Barnai river basin, north-western part of Bangladesh. In the area, the lower amount of rainfall than country-wide average as well as less infiltration capacity of thick top clay layer lies above the potential aquifer at higher depth put constrain for groundwater resource development against its ever increasing demand day by day along with limited scope to conserve surface water in rivers, Kharies (canals), Beels etc. The performance of modified MAR model for recharge rate calculation with a goal to restore declining trend of groundwater level (GWL) are found good without any quality hazard. Moreover, for continuous operation and better performance of MAR model, regular monitoring and maintenance are necessary along with in-depth research activities to address the burning water scarcity for drinking and irrigation management issue as viable option in sustainable way.
The study was carried out in the drought prone water stressed Barind area to know the state of rainfall, trend of groundwater level and groundwater management options including Managed Aquifer Recharge (MAR) techniques. Rainfall and groundwater level data have been used and shown a decreasing trend in Godagari and Mohonpur Upazila. But in Niamatpur Upazila rainfall is in reverse condition of rising trend. Decreasing trend of groundwater level (GWL) has been found in the entire study area. The decreasing trend of GWL demands judicious management of groundwater for the area. For recovery of GWL as well as groundwater management, a recharge well as MAR structure has been installed and observed that the situation is better than the before and increasing GWL. More research and study are necessary to know about the trend of groundwater level for the whole Barind area and to introduce proper designed and modified MAR techniques to reverse the declining situation of GWL.
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