Design a storm sewer system for the site development located near Atlanta, Georgia, and shown in Figure 12-26. The system should outfall at the headwall shown in the southeast corner of the tract. Your design should include system layout, drainage area delineation, hydraulic design, and outfall apron design. Assume that all paved areas are curbed. Wooded areas are delineated with wood lines. Suggested design parameters are listed below.
Design storm: 25-year
Pipe material: reinforced concrete
Manning’s n: 0.012
Minimum pipe size: 12 inches
Runoff coefficients: Impervious: 0.95
Grass: 0.32
Wooded: 0.25
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