LARE LARE Irrigation Design

Question 1

What is the primary purpose of a pressure vacuum breaker (PVB) in a landscape irrigation system?

Accepted Answer

To prevent backflow contamination of the potable water supply

Answer

A pressure vacuum breaker prevents contaminated irrigation water from siphoning back into the potable water supply through backflow protection.

Question 2

Which irrigation head type is most appropriate for large, open turf areas?

Accepted Answer

Rotor heads

Answer

Rotor heads are designed for large open turf areas because they throw water 15–50 feet using rotating streams, efficiently covering wide spaces.

Question 3

What does 'precipitation rate' refer to in landscape irrigation design?

Accepted Answer

The rate at which irrigation heads apply water to an area, measured in inches per hour

Answer

Precipitation rate is the rate at which irrigation heads apply water to a given area, expressed in inches per hour, and must be matched to the soil's infiltration rate.

Question 4

What is the typical operating pressure range for standard pop-up spray heads?

Accepted Answer

30–45 PSI

Answer

Pop-up spray heads are designed to operate at 30–45 PSI; pressures outside this range cause misting, fogging, or reduced arc coverage.

Question 5

Which soil texture has the highest water infiltration rate?

Accepted Answer

Sand

Answer

Sand has the largest particle size and greatest pore space of all soil textures, resulting in the highest infiltration rate but the lowest water retention.

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LARE LARE Irrigation Design