Given the following data for a 10-year storm, estimate the peak rate of flow to a culvert entrance. Consider the rainfall intensity-duration-frequency curves of Figure 7.7 applicable. The contributing upstream drainage area is 20 acres. The overland flow distance is 125 ft and the average land slope is 2.5%. The land use of the overland flow portion of the drainage area is lawns, sandy soil. The land use for the drainage basin is 75% residential, multiple units, detached, and 25% lawns, sandy soil with an overall average slope of about 2.7%. A channel leading to the culvert is 2000 ft long with a slope of 0.016 ft/ft. The Manning’s n value for the grassed channel is 0.030. The channel is trapezoidal with a bottom width of 3 ft and side slopes of 2 ft vertical to 1 ft horizontal.
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