Application of HEC-GeoHMS and HEC-HMS as Rainfall–Runoff Model for Flood Simulation

Abstract

Flood modeling and simulation assist in the prediction of the hazard for better flood preparedness and thus reduce flood damages. The study had simulated flood occurrence at the upper Klang–Ampang River Basin which is a flood-prone area near the capital city of Malaysia. Digital elevation model (DEM) for this area was processed in the ArcGIS 10.2 environment using terrain preprocessing tools to delineate the basin, sub-basin, and stream network. Results from the terrain preprocessing were used in the HEC-GeoHMS to extract the hydrologic parameters of the river basin. These hydrologic parameters were used in the estimation of streamflow runoff in HEC-HMS. The study had produced an illustrative and comprehensive representation of the sub-basin with reasonable accuracy indicated by the Nash–Sutcliffe coefficient of 0.86.