4. Design a vegetated swale for 5-acre drainage area. From hydrologic analysis, the water quality peak flow from the area is estimated to be 4.5 cfs. The swale must also be able to convey a flow from a 10-year event of 30 cfs. Based on site topographic conditions, the longitudinal slope is estimated to be 2%. Assume Manning roughness of 0.2.
4. Design a vegetated swale for 5-acre drainage area. From hydrologic analysis, the water quality peak flow from the area is estimated to be 4.5 cfs. The swale must also be able to convey a flow from a 10-year event of 30 cfs. Based on site topographic conditions, the longitudinal slope is estimated to be 2%. Assume Manning roughness of 0.2.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Based on site topographic conditions, the longitudinal slope is estimated to be 2%. Assume Manning roughness of 0.2.
Transcribed Image Text:**Problem Statement:**
Design a vegetated swale for a 5-acre drainage area. From hydrologic analysis, the water quality peak flow from the area is estimated to be 4.5 cubic feet per second (cfs). The swale must also be able to convey a flow from a 10-year event of 30 cfs. Based on site topographic conditions, the longitudinal slope is estimated to be 2%. Assume Manning's roughness coefficient is 0.2.
**Explanation:**
This task involves designing a drainage feature known as a vegetated swale, which is used for managing surface water runoff. The performance requirements include handling both peak flows for water quality and the more significant flow associated with a 10-year storm event. The Manning's roughness coefficient is a measure of the roughness or friction applied by vegetation in the channel, influencing how quickly water can flow through it. The slope given is a critical factor in determining water velocity and is important to account for in the swale design.
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