CFB CFB Drainage & Irrigation Systems

Question 1

What is the recommended minimum slope for surface drainage on a natural grass athletic field?

Accepted Answer

1.0%

Answer

0.5%

Answer

1.5%

Answer

2.0%

Question 2

Which type of subsurface drainage system uses perforated pipes installed in gravel-filled trenches beneath a field?

Accepted Answer

French drain system

Answer

Curtain drain system

Answer

Interceptor drain system

Answer

Slit drain system

Question 3

What is the primary purpose of a rootzone drainage layer in a sand-based athletic field?

Accepted Answer

To allow rapid percolation of water away from the playing surface

Answer

To provide nutrients to grass roots

Answer

To stabilize the soil against compaction

Answer

To insulate against frost damage

Question 4

In athletic field irrigation design, what does 'distribution uniformity' (DU) measure?

Accepted Answer

The consistency of water application across the irrigated area

Answer

The total volume of water applied per irrigation cycle

Answer

The pressure at the irrigation pump outlet

Answer

The flow rate of individual sprinkler heads

Question 5

Which factor most directly determines the spacing between lateral drainage pipes in an athletic field?

Accepted Answer

The hydraulic conductivity of the soil

Answer

The field's intended sport use

Answer

The annual precipitation of the region

Answer

The depth of the water table

Question 6

What is the standard installation depth for main collector drain lines beneath athletic fields in the US?

Accepted Answer

36–48 inches

Answer

6–12 inches

Answer

18–24 inches

Answer

60–72 inches