3. A 200 m x 200 m square parking lot slopes toward one of its edges....

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3. A 200 m x 200 m square parking lot slopes toward one of its edges. The parking lot drains into a gutter along the downstream edge. Adjacent land drains away from the parking lot, such that the parking lot represents the entire watershed being considered. The gutter drains into a storm sewer inlet at its center. The longest flow path (corner to inlet) consists of 200 m of overland flow across the parking lot and 100 m of gutter. Velocities are 10 m/minute for overland and 20 m/minute for gutter flow. A cumulative rainfall depth versus duration relationship for a 25-year recurrence interval is provided in the table. C is 0.95. Use the rational method to estimate the 25-year recurrence interval peak inflow to the storm sewer inlet. Use a 25 minute storm duration. (Answer: 1.60 cms) Time (min) Cumulative Depth (mm) 25 39 49 5 10 15 20 25 30 60 57 63 67 86 3. A 200 m x 200 m square parking lot slopes toward one of its edges. The parking lot drains into a gutter along the downstream edge. Adjacent land drains away from the parking lot, such that the parking lot represents the entire watershed being considered. The gutter drains into a storm sewer inlet at its center. The longest flow path (corner to inlet) consists of 200 m of overland flow across the parking lot and 100 m of gutter. Velocities are 10 m/minute for overland and 20 m/minute for gutter flow. A cumulative rainfall depth versus duration relationship for a 25-year recurrence interval is provided in the table. C is 0.95. Use the rational method to estimate the 25-year recurrence interval peak inflow to the storm sewer inlet. Use a 25 minute storm duration. (Answer: 1.60 cms) Time (min) Cumulative Depth (mm) 25 39 49 5 10 15 20 25 30 60 57 63 67 86

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