Plumbing Level 3 Sizing DWV and Storm
Systems
Codes require storm drainage systems in all - Answer- Commercial and residential buildings
According to the figure above, the drain line with the diameter of 8 inches and a slope of 1/8 per
foot can handle how many drain fixture units(DFUs)? - Answer- 1600 DFUs
Tables with drainage fixture units values for fixtures can be found in - Answer- Local codes
In cold climate, the top most portion of a vent terminal should be enlarged to prevent - Answer-
Frost buildup
The proper sizing of a storm drainage system requires the plumber to know the maximum
expected rain during a given period and the - Answer- Design rate of removal
The most accurate indicator of the local rainfall is the - Answer- 100 year average
If a roof has an area of 3,000 square feet and a design water depth of 6 inches, the number of
gallons of water it can hold is - Answer- 1500 cubic feet of water
Water through siphonic roof drain system is achieved by - Answer- Suction
Horizontal branches in a roof drainage system are usually installed with a slope of 1/8 inch per
foot, which is elevated to a slope of - Answer- 1% grade
The ability of soil to absorb water is its - Answer- Permeability
Systems
Codes require storm drainage systems in all - Answer- Commercial and residential buildings
According to the figure above, the drain line with the diameter of 8 inches and a slope of 1/8 per
foot can handle how many drain fixture units(DFUs)? - Answer- 1600 DFUs
Tables with drainage fixture units values for fixtures can be found in - Answer- Local codes
In cold climate, the top most portion of a vent terminal should be enlarged to prevent - Answer-
Frost buildup
The proper sizing of a storm drainage system requires the plumber to know the maximum
expected rain during a given period and the - Answer- Design rate of removal
The most accurate indicator of the local rainfall is the - Answer- 100 year average
If a roof has an area of 3,000 square feet and a design water depth of 6 inches, the number of
gallons of water it can hold is - Answer- 1500 cubic feet of water
Water through siphonic roof drain system is achieved by - Answer- Suction
Horizontal branches in a roof drainage system are usually installed with a slope of 1/8 inch per
foot, which is elevated to a slope of - Answer- 1% grade
The ability of soil to absorb water is its - Answer- Permeability
