IA Water Auditing & Irrigation Efficiency

Question 1

The Irrigation Association defines a landscape irrigation audit as a process to evaluate:

Accepted Answer

How efficiently and uniformly an irrigation system applies water

Answer

Soil nutrient levels

Answer

The financial cost of the irrigation system

Answer

The legal compliance of backflow preventers

Question 2

Distribution Uniformity Low Quarter (DU_lq) is calculated by dividing the average of the lowest 25% of catch can readings by:

Accepted Answer

The overall average of all catch can readings

Answer

The highest single reading

Answer

The median reading

Answer

The design precipitation rate

Question 3

What is the minimum acceptable DU_lq percentage recommended by the Irrigation Association for landscape systems?

Accepted Answer

70%

Answer

40%

Answer

55%

Answer

90%

Question 4

During a catch can audit, how many cans are typically placed in a single irrigation zone?

Accepted Answer

At least 8–16 cans per zone in a grid pattern

Answer

1–2 cans per zone

Answer

3–4 cans per zone

Answer

One can per sprinkler head

Question 5

An irrigation audit station flow rate is determined by measuring:

Accepted Answer

The volume of water discharged from a zone over a measured time period

Answer

Static pressure only

Answer

The number of heads in the zone

Answer

The pipe diameter at the valve

Question 6

Schedule efficiency (SE) in irrigation describes:

Accepted Answer

How well the irrigation schedule matches actual plant water demand

Answer

The ratio of gallons applied to gallons metered

Answer

The pump motor efficiency rating

Answer

The number of zones completed per hour