The dry season irrigation primarily depends on groundwater in Bangladesh. The over-abstraction, along with decreasing recharge, is depleting the groundwater resource across the country. Consequently, the government of Bangladesh is planning to switch from groundwater to surface water irrigation. In line with this, Bangladesh Water Development Board has proposed to construct a rubber dam on the Mohananda river at the Chapai Nawabganj district. This work investigated the impact of the proposed reservoir facilitated surface water irrigation on the adjacent groundwater in the study area. A coupled river–groundwater modeling technique was used to predict the long-term groundwater condition. Results showed that the groundwater lowering rate reduced to 50 mm/year inside the irrigation zone compared to 87 mm/year outside the zone. Also, the augmented surface water irrigation raised the groundwater over an area of 141 km² and 242 km² in 2029 relative to the base condition of 2013 and existing irrigation practice if continued, respectively. Besides, the raised groundwater resulted in a higher discharge from the aquifer to the river. The study concludes that increased surface water irrigation successfully lowered the groundwater declination rate, especially in the surface water irrigation zone.

旱季灌溉主要依靠孟加拉国的地下水。过度开采，再加上补给减少，正在消耗全国的地下水资源。因此，孟加拉国政府计划从地下水灌溉转向地表水灌溉。为此，孟加拉国水务发展委员会提议在Chapai Nawabganj地区的Mohananda河上建造一个橡胶坝。这项工作调查了拟议的水库促进地表水灌溉对研究区域内相邻地下水的影响。河流-地下水耦合模拟技术被用来预测长期地下水状况。结果表明，灌溉区内部的地下水下降率降至每年50毫米，而灌溉区外部的地下水下降率则为87毫米/年。也，²和242公里²在2029相对于2013基本条件和现有灌溉实践如果继续下去，分别。此外，升高的地下水导致含水层向河流的排放量增加。研究得出结论，增加地表水灌溉成功地降低了地下水的倾斜速度，特别是在地表水灌溉区。