Technical report: the discharges calculation of flood routing in an open channel / Nurul Amanina Supar, Nur Atiqah Khamis and Hamidah Kamarudin

Flood routing problem can be calculated by using Saint Venant's equations. This equation includes momentum and continuity equation. The derivation of momentum equation will trans­form to a partial differential equation which related to the discharge of the channel. Numerical method of an explicit finite difference can be used to calculate the discharge of the channel and the cross-sectional. Apart from numerical method, Slope-Area Method of stream also can be used to calculate the discharge. Velocity of flow in channels will compute by using Manning's formula. Then, the discharge calculated using this Manning's equation. The selection of Man­ning roughness coefficients, n is an important for this method according to the types of channel such as natural streams or artificial channels. The result of calculation discharge using Slope­Area Method will be plot in the graph of gage height versus discharge. This graph is represent the relationship between gage height with the discharge and it is show that, the increasing of the discharge are related with the gage height of the streams.