Storm Drainage Plumbing Systems CNST 305 Environmental Systems 1 Dr. Berryman 2bcWaste Water Disposal and Storm Drainage Chapter 4, 7; Appendix A (Wentz)

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Plumbing Systems CNST 305 Environmental Systems 1 Dr. Berryman

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Presentation transcript:

Storm Drainage Plumbing Systems CNST 305 Environmental Systems 1 Dr. Berryman 2bcWaste Water Disposal and Storm Drainage Chapter 4, 7; Appendix A (Wentz) and (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

Rainfall Rate Map Omaha, NE Code 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 Basin Locations

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 ’ 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 3ab c Water SystemChapter 8; Appendix B (Wentz) and (Toa) 4.11 Analysis and Design of Construction Systems - Mechanical (6 hrs) WATER SYSTEMS