INWEPF 2018:ESTIMATION OF GROUNDWATER RECHARGE AND AVAILABILITY IN SELECTED LOCATIONS OF BANGLADESH

ESTIMATION OF  GROUNDWATER RECHARGE AND AVAILABILITY IN SELECTED LOCATIONS OF BANGLADESH

 

Author : Dr M. A. Rashid     

 

ABSTRACT

The study was conducted in 5 selected locations in 3 districts of Barind Multipurpose Development Authority (BMDA) project area of Bangladesh to investigate the aquifer characteristics and  water table fluctuation and to quantify the recharge and availability of groundwater and the area that could be irrigated with the available water. The recharge of groundwater was calculated using average groundwater table fluctuation and specific yield The water table fluctuation was multiplied by the specific yield to obtain the annual recharge. The results indicated that the Barind aquifers have good potential for groundwater development.  The study showed that although the groundwater table is gradually declining day by day during dry season due to increasing demand for discharge but the aquifer is fully recharged after the monsoon except in a few locations. The average annual recharge was found to be 0.497 m. On average 35%  of the total land area of each Thana can be irrigated with the existing total volume of available groundwater. In total an additional 75.5 Mm3 of groundwater is available for irrigation in the studied 5 Thanas, which can be utilized to irrigate an additional 10,630 ha more area using the recommended practice (AWD) and this additional area is about 6% of the total land area. Therefore, more irrigation facilities should be developed with the additional available water to increase rice production and to meet the increased food demand.