Urban flood study using HEC-HMS / Wan Ahmad Zaihan Wan Johan

Flash flood is caused by thunderstorm which is localized rainfall of very high intensity and short durations 2 to 5 hours. The intense level of precipitation causes large volumes of storm run-off which often leads to drainage and river system in the localized areas being completely over loaded. HEC-HMS is the solution for prediction and evaluation of flood at water catchments especially in urban area. This study focus on how the model can simulate the catchments for present and future use. The model simulate rain fall -runoff process by determined the discharge and runoff volume produced. Rainfall data were use as main role in this research to determine the runoff and data from stream flow is for comparison and calibration. Result simulated from this study proved the increase of impervious area can contribute to increase of runoff volume and discharge.