Analisis Kapasitas Simpan Air pada DAS Cisarua, Kabupaten Bogor

Abstract

Watershed degradation could be characterized by changes in land use of catchment area with low run off coefficient to bare land with high run-off coefficient. Water balance calculation using Tornthwaite equation could be used to calculate fluctuation of water storage in a region. Water balance analysis was conducted at the Cisarua watershed with total area of 2491.90 ha. The objective of this research were to analyse water storage capacity, to calculate water avaibility (based on rainfall data), to calculate water demand, and to provide recommendations of run-off and groundwater recharge management in Cisarua watershed areas. Based on ideal ratio of run-off and groundwater recharge, the composition of the forest area of 50% in Cisarua watersheds is considered ideal, because it has a percentage of run-off by 51%. Residential area composition in Cisarua watershed (30%) is considered ideal, because the run off percentage is 49%. Environmental carrying capacity based on water balance of an area could be determined by calculating the capacity of water availability in the region. With a density of 2080 habitant / km2 and precipitation of 1870.1 mm / year, it could know that Cisarua watershed areas in 2010 were in the state of overshoot. Conservation methods that could be used in efforts to manage run-off excess were the construction of infiltration wells and reforestation