EFFICIENT FOREST DESIGN FOR WATER MANAGEMENT IN THE CISALAK RIVER BORDER AREA, RANCAMULYA VILLAGE, SUMEDANG UTARA DISTRICT, SUMEDANG REGENCY, WEST JAVA

• Main Author: Safitri, Alfat
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/86805
• Institution: Institut Teknologi Bandung

The riparian zone of the Cisalak River in Rancamulya Village plays a critical role in protecting and regulating water resources for downstream areas. Land cover changes, such as deforestation within the riparian zone, have been linked to increased runoff. This study aims to determine how biogeophysical parameters of the Cisalak River riparian zone respond to rainfall intensity and to assess the effectiveness of changes in forest area in reducing runoff, thereby achieving a desired reduction in peak discharge. The study employed the Rational Method to calculate peak discharge (QP) using planned rainfall intensity, runoff coefficient, and study area. Planned rainfall intensity was determined using Gumbel distribution analysis and the Mononobe method, the runoff coefficient was calculated using the Hassing method, and the study area was digitized on-screen. The rainfall intensity that could occur in the study area within 5-100 years is 141.56-202.20 mm/h, with a runoff coefficient of 48%. The maximum possible runoff is between 1.95-2.79 m³/s. Runoff can be effectively reduced by up to 18% from the actual total runoff if the biogeophysical conditions are restored to comply with the spatial pattern specified in the Sumedang Regency Spatial Plan.