The Use of Basins for Reducing Downstream Flooding (A Case Study of Flood Control at Ganggang Sub-Watershed of Bojonegoro Regency)

摘要

This study was aimed to investigate (1) the use of basins at Ganggang sub-watershed as retarding basins, (2) the storage volume required by the inundation at the downstream of Ganggang sub-watershed, and (3) the capacity volume of the area at Ganggang sub-watershed. The method used in this study were (1) producing the topographic map of Ganggang sub-watershed by using Google Earth, Surfer and ArcMap 10.4.1, (2) calculating the capacity volume of retarding basin according to inundation parameter and sensing of the basin topographic using ArcMap 10.4.1, (3) measuring the area of the basin using ArcMap 10.4.1, (4) calculating the capacity volume of the basin. This study produced several outputs such as topographic maps of Ganggang sub-watershed, a site-plan of the retarding basin location, and a design volume of the retarding basin capacity.