Study and comparison of calculation methods for flood peak discharge of cut-off ditch in small watershed
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Abstract:
The flood peak discharge of a cut-off ditch is an important parameter in cut-off ditch design. In this paper, we compared three calculation methods for flood peak discharge o f cut-off ditches based on a project case. We studied the influence of rainfall duration, unit weight of torrential flood, and recurrence interval on flood peak discharge, and analyzed the significance degree of the influence factors. It was found that Method 1(Code for design of soil and water conservation projects) and Method 3(Code for design of outdoor drainage projects) had similar results for the project case and both leaned towards safety. The flood peak discharge wouldg radually decrease with the increase of rainfall duration, with a power function relation between them. The peak discharge would increase with the increase of unit weight of torrential flood, with an exponential function relation between them. The peak discharge showed atrend of logarithmic growth with the increase of recurrence interval. Catchment area had the largest influence on flood peak discharge for Methods 1 and 3, followed by rainfall duration and runoff coefficient, while the influence of recurrence interval on flood peak discharge was the smallest. Catchment area had the largest influence on flood peak discharge for Method 2 ( Technical code on soil and water conservation of development and construction projects) , followed by runoff coefficient and recurrence interval, while the influence of unit weight of torrential flood on flood peak discharge was the smallest for Method 2.
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