Figure 2.9 shows the delineated watershed of Mananga River. The total delineated watershed area is 6,812 hectares. Aside from watershed delineation, hydrologic properties of the watershed were also calculated in HEC-GeoHMS.
After preprocessing of the watershed’s hydrologic properties, the basin model of the watershed is then processed in HEC-HMS 3.5. HEC-HMS aims to generate the rainfall-runoff relationship in the watershed. Figure 1 2 shows basin model in HEC-HMS of Mananga River. It is composed of 39 subbasins and 19 reaches.