DETERMINATION OF WATER CATCHMENT AREAS AND WATER BALANCE ANALYSIS IN CISANTI LAKE AREA (UPSTREAM CITARUM WATERSHED), BANDUNG REGENCY, WEST JAVA

• Main Author: SAPUTRI (Nim : 11514053), YULYA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/31826
• Institution: Institut Teknologi Bandung

Cisanti Lake is a water source for Citarum River which is the main river in West Java. The forest area around Cisanti Lake plays a role in determining the availability of water which is utilized by the community for various activities. Water from forest areas is the output of good forest ecosystem performance as a catchment area, so that the catchment area requires an optimal management. Therefore, information about the catchment area and the availability of water are important to know for the management of the area as a water source. This study aims to: (1) determine the boundary, area and land cover types of Cisanti’s water catchment area; (2) determine Cisanti's Lake mainstay discharge; and (3) determine the water balance of Cisanti’s water catchment area. The determination of the catchment area was carried out using HESSA (Hydro Ecosystem Services Spatial Assessment) method by analyzing the coordinates of water sources that were processed with SRTM data (Shuttle Radar Topography Mission) using Global Mapper software. The mainstay discharge value is obtained by measuring the water discharge directly in the field while the calculation of water balance is refers to the F.J Mock method (1973) using rainfall data, potential evapotranspiration, and hydrological characteristics as input data set. Potential evapotranspiration is calculated using the Penman method with climatological and supporting data as input data set. The results showed that of the seven springs flowing into Cisanti Lake, there was an area of water catchment around 150.26 hectares. The area itself consists of five types of land cover i.e forest (77.38 ha), underbrush (53.32 ha), plantations (9.71 ha), dryland agriculture (1.21 ha), and water bodies (8, 65 ha). It is capable of producing a water discharge up to 2,701,563.99 m3 / year and water discharge from F.J Mock Method is 1.408.642,3 m3/year. Based on water balance analysis is known that the area has a water surplus around 14.4 million m³ / year to 42.9 million m³ / year, and has a deficit around 1.9 million to 4.5 million m³ / year.