1. Storm Drainage Plumbing Systems CNST 305 Environmental Systems 1 Dr. Berryman 2bcWaste 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)

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. Rainfall Rate 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 Basin Locations

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

16. Allowable Flow Rate Table

17. Flow Rate for Conductors/Leaders

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

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

20. Sizing Site Drains Location: Western Colorado Slope = 1.0” / 100’ Design for 100 year rain 3 acres ½ bituminous ½ grass 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. Next Time 3ab c Water SystemChapter 8; Appendix B (Wentz) and 8.1- 8.3 (Toa) 4.11 Analysis and Design of Construction Systems - Mechanical (6 hrs) WATER SYSTEMS