CGM CGM Irrigation & Water Management 2

Question 1

What is 'distribution uniformity' (DU) in irrigation, and why does it matter?

Accepted Answer

A measure of how evenly water is applied across an irrigated area; low DU means some areas are over- or under-watered

Answer

DU quantifies consistency of water application across a zone; poor uniformity leads to drought stress in dry spots or disease and waste in wet spots.

Question 2

When conducting a catch-can test on a turf irrigation system, what is being measured?

Accepted Answer

The uniformity and precipitation rate of sprinkler coverage

Answer

A catch-can test places containers throughout a zone to collect applied water, revealing distribution uniformity and the actual precipitation rate delivered.

Question 3

Which irrigation scheduling strategy is considered most water-efficient for established turfgrass?

Accepted Answer

Deep, infrequent watering that wets the full root zone and allows soil to partially dry between cycles

Answer

Deep, infrequent irrigation promotes deeper root growth and allows the soil to partially dry, reducing fungal disease pressure and total water use.

Question 4

What is the function of a master valve in an irrigation system?

Accepted Answer

To serve as a main shutoff that closes when the system is not actively running, preventing leaks from faulty zone valves

Answer

A master valve acts as a failsafe shutoff installed at the system's water source that only opens when a zone valve is scheduled to run.

Question 5

In the US, which entity typically regulates irrigation water use restrictions during drought conditions?

Accepted Answer

State and local water authorities or municipalities

Answer

Water use restrictions during drought are primarily managed by state water agencies and local water utilities, which issue mandatory or voluntary conservation orders.

(CGM) Certified Grounds Manager Practice Test

(CGM) Certified Grounds Manager Practice Test

CGM CGM Irrigation & Water Management 2