1. 1 STORM SEWER DESIGN

2. 2 WHAT CAN HAPPEN http://www.youtube.com/watch?v=tHWwv MrOj5Ehttp://www.youtube.com/watch?v=tHWwv MrOj5E

3. 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. 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. 5 SPREAD VS. ENCROACHMENT http://www.iowadot.gov/design/dman ual/04a-05.pdfhttp://www.iowadot.gov/design/dman ual/04a-05.pdf

6. 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. 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

8. 8

9. 9