POTENTIAL OF GROUNDWATER RESOURCES IN AGRICULTURAL LAND IN THE COASTAL AREA OF SAMAS BEACH AND PANDANSARI BEACH, SANDEN DISTRICT Nur Ahmad Abidin, Dyah Arbiwati and Susila Herlambang
UPNYK
Abstract
The coastal areas of Samas and Pandansari beaches are areas that are widely used for the agricultural sector, but also have very large limiting factors such as high water passability and low water storage capacity. The most important factor in agricultural land in coastal areas is groundwater resources for irrigation. This study aims to assess the qualitative and quantitative potential of groundwater resources in coastal agricultural lands on Samas Beach and Pandansari Beach and determine the quality of irrigation water according to the US Salinity Lab Staff, 1954. The method used in this research is survey, and purposive sampling based on the division of the radius of 100 areas. m, 300 m, 500 m, and 700 m from the shoreline. The coastal areas of Samas Beach and Pandansari Beach have an average SAR value of 2.1949 mg/L, an average RSC value of 0.5453 mg/L, and an average DHL value of 462.833. The highest SAR value of 6.7764 mg/L at TS 12 is at a radius of 700 m from the shoreline, the highest RSC value is 1.7888 mg/L at TS 5 at a radius of 300m from the shoreline, and the highest DHL value is 820 S/cm at TS 12 is located at a radius of 700 m from the coastline. The average groundwater level is 3,682 m in moderate condition. Groundwater flow patterns move towards locations that have a deeper groundwater table. Assessment of irrigation water quality according to the USSL diagram of 12 samples, 11 samples were in the C2-S1 classification and 1 sample was in the C3-S1 classification.
