However, he also would like to get a uniform application of water over the field. The flow to the cannel is controlled by Maning's equation because the field is a mile and a half from the main irrigation district turnout. The water is at a high of 3 ft in the cannel. The soil is a clay loam. Question How many gates should he open at a time.
Solution First calculate the flow rate in the cannel using Manning equation.
Using the basin border mode l calculate optimal width of the field for the given flow. Extra credit activity. Evaluatate the width of the boarders for optimal operation if the field was a a graded border with the slope 0.0005. Down load the graded border model and run and determine the optimal width.