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Published byMolly Benford
Modified over 2 years ago
1 STORM SEWER DESIGN
2 WHAT CAN HAPPEN http://www.youtube.com/watch?v=tHWwv MrOj5Ehttp://www.youtube.com/watch?v=tHWwv MrOj5E
3 HYDRAULIC DESIGN CHARTS –http://www.fhwa.dot.gov/engineering/hydraulic s/pubs/hds3.pdfhttp://www.fhwa.dot.gov/engineering/hydraulic s/pubs/hds3.pdf
4 INLET CAPACITY http://www.neenahfoundry.com/cont ent/Inlet%20Grate%20Capacities/w eir%20and%20orifice%20equation/d efault.aspxhttp://www.neenahfoundry.com/cont ent/Inlet%20Grate%20Capacities/w eir%20and%20orifice%20equation/d efault.aspx
5 SPREAD VS. ENCROACHMENT http://www.iowadot.gov/design/dman ual/04a-05.pdfhttp://www.iowadot.gov/design/dman ual/04a-05.pdf
6 EXAMPLE S x = 0.03 (cross-slope of gutter) n = 0.016 (Manning’s “n” for PCC) Q = 1.6 cfs S L = 0.02 (longitudinal gutter slope) Z = 1/S x = 1/0.03 = 33.33 Z/n = 33.33/0.016 = 2083
7 EXAMPLE Z/n = 2083 Connect to SL = 0.02 Turning line through Q = 1.6 to depth of 0.18 feet Spread “w” w = d * Z = 0.18 * 33.33 w = 6 feet
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