Changes in peak discharge based on sago land use scenarios in the upstream Rongkong watershed, Indonesia

Land use affects changes in peak discharge so that it has the potential to cause or prevent flooding. Sago morphological characteristics have absorb more water. This study aimed determine magnitude of change upstream watershed after sago planting. Observations were made on three growth phases palms (initial, middle, and mature phases). The research stages included calculating runoff coefficient value under stands at phases. Peak existing conditions (settlements, rice fields, mixed gardens, shrubs, sand dunes, forests, water bodies) was estimated scenarios land use. consisted 25% area planted with (scenario 1), 50% for scenario 2, 100% 3. data analyzed quantitatively by comparing results. results showed 52.36 m<sup>3 </sup>hour<sup>-1</sup>. initial phase 1 18.94 </sup>hour<sup>-1</sup>, 2 37.88 3 75.77 middle 19.01 38.02 76.04 6.38 </sup>hour, 12.76 26.55 decreased all phases, except