Sanitary Drainage Quiz

What is the recommended slope for horizontal drains in a structure?

• 1/4 inch per foot

• 1/2 inch per foot

• 1 inch per foot

• 2 inches per foot

When renovating a structure, what should be examined to ensure proper drainage?

• Existing building drain and branches

• Materials used in the drainage system

• Connection to the appropriate sewer

• Size of the drains

What is the minimum size of a building drain serving a water closet?

• 1 1/4 inches

• 1 1/2 inches

• 2 inches

• 3 inches

What is the purpose of a sump in a drainage system?

• To collect and store wastewater

• To provide ventilation for the drainage system

• To prevent backflow of wastewater

• To regulate the flow of wastewater

What is the minimum diameter of the discharge piping from sewage pumps and ejectors?

• 1/4 inch

• 1/2 inch

• 3/4 inch

• 1 inch

Where should the pump discharge connect when connecting to a horizontal drain line?

• At the bottom of the horizontal drain line

• At the top of the horizontal drain line

• In the middle of the horizontal drain line

• Anywhere along the horizontal drain line

What is the recommended distance for horizontal drain branches to connect downstream of a stack?

• 10 inches

• 20 inches

• 30 inches

• 40 inches

What is the minimum depth at which a charge shall connect into the top of the horizontal drain line?

• 12 inches

• 18 inches

• 24 inches

• 30 inches

How far downstream of the base of the stack should the connection be when connecting the charge to a horizontal drain?

• 5 pipe size diameters

• 8 pipe size diameters

• 10 pipe size diameters

• 12 pipe size diameters

What is the minimum capacity of a sewage pump or sewage ejector for a 3-inch diameter discharge pipe?

• 21 gpm

• 30 gpm

• 46 gpm

• 60 gpm