This paper presents the methods and results of hydrologic modeling of Guinale river basin through the use of HEC-HMS
software and Synthetic Aperture Radar Digital Elevation Model (SAR DEM). Guinale River Basin is located in the
province of Albay, Philippines which is one of the river basins covered by the Ateneo de Naga University (ADNU)
Phil-LiDAR 1. This research project was funded by the Department of Science and Technology (DOST) through the
Philippine Council for Industry, Energy and Emerging Technology Research and Development (PCIEERD). Its objectives
are to simulate the hydrologic model of Guinale River basin using HEC-HMS software and SAR DEM. Its basin covers an
area of 165.395 sq.km. and the hydrologic model was calibrated using the storm event typhoon Nona (international name
Melor). Its parameter had undergone a series of optimization processes of HEC-HMS software in order to produce an
acceptable level of model efficiency. The Nash-Sutcliffe (E), Percent Bias and Standard Deviation Ratio were used to
measure the model efficiency, giving values of 0.880, 0.260 and 0.346 respectively which resulted to a “very good”
performance rating of the model. The flood inundation model was simulated using Legazpi Rainfall Intensity Duration
Frequency Curves (RIDF) and HEC-RAS software developed by the US Army corps of Engineers (USACE). This
hydrologic model will provide the Municipal Disaster Risk Reduction Management Office (MDRRMO), Local
Government units (LGUs) and the community a tool for the prediction of runoff in the area.
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