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Storm Drainage
Plumbing Systems
CNST 305 Environmental Systems 1Dr. Berryman
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)
Why Storm Drains (rainwater systems)?
Design Principles Install piping large enough to handle
rainfall in a reasonable amount of time
Size system based on rate of rainfall
RainfallRate Map
Omaha, NECode design -
6” Rainfall per hour
Source: National Standard Plumbing Code
Source: National Weather Service
Mmmhhhh? Only 3.8 inches per hour
Roof Drains Four Types
Flat Roof – Drains
Flat Roofs – Flow Control
Overflow Drains
Site Drains
Catch BasinLocations
Types of Pipe for Site Drains
Plastic Vitrified Clay Cast Iron Corrugated Galvanized
Manhole Placement
Engineering Design Determine Rainfall
Determine Area Determine Number of Drains Determine Slope Available
Sizing Roof Drains
80’Location: East Kansas
Slope: 1/8” per ft
40’c.o.
Allowable Flow Rate Table
Flow Rate for Conductors/Leaders
Sizing Roof Drains (cont.)
80’Location: East Kansas
Slope: 1/8” per ft
Rainfall Rate: 6”/hr
40’c.o.
Sizing Site Drains Formula
Flow (CFS) – CIA• • •
Chart Mannings chart for concrete pipe
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
Coefficients of Runoff
Sizing Site Drains (cont.)
FORMULA Flow = CIA
CFS =
size pipe…go to Manning
Manning Pipe Flow Chart
Checking Velocity and Time
Next Time
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)
WATER SYSTEMS