Abstract
The Raimanuk area, located in East Nusa Tenggara, had a population growth rate of 0.94% in 2019. The area used for harvested agricultural land was 205 Ha. As the population and agricultural land increase, the water demand also increases. Groundwater extraction is feared to be out of control because Raimanuk is a drought-prone area. The availability of groundwater is closely related to the amount of water infiltration and the amount taken. In accordance to that, it is necessary to find out the origin of groundwater in the Raimanuk area. This study aimed to determine the groundwater recharge area using environmental isotopes analysis of 2H and 18O and hydrochemistry. Rainwater samples were taken in March and April 2021 once in every month at 4 locations with different elevations. Groundwater sampling was carried out at 10 drilled wells, 6 dug wells, and 4 springs. Groundwater in the Raimanuk area can be grouped into 4 groups. The groundwater recharge area is in the Mandeu hills at an altitude above 390 masl. The composition of groundwater is dominated by calcium (Ca), sodium-potassium (NaK), and bicarbonate (HCO3).
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call