HUBUNGAN KERAGAAN BIOFISIK DAN MORFOMETRI DAERAH ALIRAN SUNGAI (DAS) KENALI BESAR, PROVINSI JAMBI DENGAN KONDISI HIDROLOGINYA (The Relationship between The Biophysical and Morphometry of The Kenali Besar Watershed, Jambi Province with Its Hydrological Conditions

Abstract

Watershed degradation is one of the environmental problems in many parts of Indonesia. The main environmental problem in the watershed is land-use that does not consider soil and water conservation principles. Irresponsible land use will affect the hydrological function of an area. An impaired hydrological function is one indicator of watershed damage. The aim of the study was to identify and evaluate the biophysical conditions, watershed morphometry, and its relationship with the hydrological condition of the Kenali Besar watershed. The Kenali Besar watershed covers the area of Jambi City and Muaro Jambi Regency. The research was carried out in 2020 using a survey method and the research data were analyzed descriptively. The results showed that the Kenali Besar watershed has an elongated shape with medium drainage density. The watershed morphometry shows that the Kenali Besar has a relatively fast time to peak and decline in flow as well. The analysis shows that the Kenali Besar watershed has a flood risk because the land use is dominated by residential areas (40.69%), which has a relatively low capacity and infiltration rate. The ratio of instantaneous flow rates in the middle and downstream reaches 54.10 m3/s and 57.67 m3/s, respectively