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Storm Drainage

Storm Drainage

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Storm Drainage

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  1. 2bc Waste Water Disposal and Storm Drainage Chapter 4, 7; Appendix A (Wentz) and 8.6 -8.7 (Toa) 4.11 Analysis and Design of Construction Systems - Mechanical (3 hrs) Storm Drainage Plumbing Systems CNST 305 Environmental Systems 1 Dr. Berryman

  2. Why Storm Drains (rainwater systems)?

  3. Design Principles • Install piping large enough to handle rainfall in a reasonable amount of time • Size system based on rate of rainfall

  4. RainfallRate Map • Omaha, NE Code design - 6” Rainfall per hour Source: National Standard Plumbing Code

  5. Source: National Weather Service Mmmhhhh? Only 3.8 inches per hour

  6. Roof Drains • Four Types

  7. Flat Roof – Drains

  8. Flat Roofs – Flow Control

  9. Overflow Drains

  10. Site Drains

  11. Catch BasinLocations

  12. Types of Pipe for Site Drains • Plastic • Vitrified Clay • Cast Iron • Corrugated Galvanized

  13. Manhole Placement

  14. Engineering Design • Determine Rainfall • Determine Area • Determine Number of Drains • Determine Slope Available

  15. Sizing Roof Drains Location: East Kansas Slope: 1/8” per ft 80’ c.o. 40’

  16. Allowable Flow Rate Table

  17. Flow Rate for Conductors/Leaders

  18. Sizing Roof Drains (cont.) Location: East Kansas Slope: 1/8” per ft Rainfall Rate: 6”/hr 80’ c.o. 40’

  19. Sizing Site Drains • Formula • Flow (CFS) – CIA • Chart • Mannings chart for concrete pipe

  20. Sizing Site Drains 3 acres ½ bituminous ½ grass • Location: Western Colorado • Slope = 1.0” / 100’ • Design for 100 year rain CB Rim El. 99.6 200’ 36” SS Main

  21. Coefficients of Runoff

  22. Sizing Site Drains (cont.) FORMULA Flow = CIA CFS = size pipe…go to Manning

  23. Manning Pipe Flow Chart

  24. Checking Velocity and Time

  25. 3abc Water System Chapter 8; Appendix B (Wentz) and 8.1-  8.3 (Toa) 4.11 Analysis and Design of Construction Systems - Mechanical (6 hrs) Next Time WATER SYSTEMS