ABSTRACT
Hydraulic modelling converts a certain amount of discharge into corresponding water depth based on channel geometry at a particular section. As such, hydraulic modelling is more important in regards to flood warning and/or determination of expected damage. There are two types of hydraulic modeling: Steady flow and unsteady flow. Hydraulic model calculations for steady flows are performed using the energy equation and Manning’s equation. For the hydraulic modelling calculations, energy equation is considered with a loss, which is obvious for a natural channel having significant bed roughness/friction. HEC-RAS stands for Hydrologic Engineering Center’s River Analysis System and is the most widely-used hydraulic model for one-dimensional analysis. HEC-RAS stands for Hydrologic Engineering Center’s River Analysis System and is the most widely-used hydraulic model for one-dimensional analysis. HEC-RAS is capable of performing some more sophisticated analyses, such as sediment flow calculations, flow calculations through a bridge, culvert, sluice gate, drop structure, weir and spillways.
