明渠水理計算(Open Channel Flow Cal)

In the design of irrigation ditches, firstly, based on the conditions of the irrigation area and plant species, the irrigation water flow rate Q is estimated; the design of the drainage ditches is based on the rainfall, catchment area, etc., to estimate the drainage demand flow Q; therefore Generally, the first value obtained when designing a ditch is the flow rate Q, and then according to the size of the construction land, an appropriate channel width B and cross-section type (rectangular or trapezoidal, etc.) are selected, and the water level height d is calculated. Finally, the designer can add an appropriate water outlet height as the final channel design wall height.