The study of water balance at Karai sub watershed

Abstract

Abstract Water balance could be a clue of water available in a watershed. It could interpreted the amount of water supply and demand in an area.The extream condition of water excess or water deficiency would be flood and drought disaster. This research is aimed to obtain the value of water balance components in Karai Sub Watershed. The research result shown the source of water supply that 100 percent from rainfall was 2,811 mm/year and the total of water lost was about 1,988 mm/year that be in the form of water demand in this watershed. Several water demand in this watershed was the amount of water lost from interception about 540 mm/year, evapotranspiration about 1,382 mm/year, surface runoff abouta 42.82 mm/year, and domestic needs about 22.95 mm/year. In general, the excess water storage in Karai Sub Watershed amount 822.14 mm/year that about 29.25 percent of water supply.