LARE LARE Irrigation Design 2

Question 1

What does 'matched precipitation rate' (MPR) technology accomplish in an irrigation zone?

Accepted Answer

It ensures that quarter-, half-, and full-circle heads in the same zone all apply water at the same rate

Answer

MPR technology ensures heads with different arc sizes apply water at the same depth per hour so the entire zone receives uniform coverage without wet or dry spots.

Question 2

What is the function of a pressure-compensating emitter in a drip irrigation system?

Accepted Answer

It maintains a consistent flow rate across a wide range of operating pressures

Answer

Pressure-compensating emitters maintain a consistent output flow rate despite variations in operating pressure, ensuring uniform application on slopes or long lateral runs.

Question 3

What term describes the combined water loss from soil evaporation and plant transpiration?

Accepted Answer

Evapotranspiration (ET)

Answer

Evapotranspiration (ET) combines evaporation from soil and transpiration through plant tissue, representing the total water demand that irrigation must replace.

Question 4

What is the purpose of a check valve built into rotor and spray heads?

Accepted Answer

To prevent low-head drainage after the zone valve closes on sloped sites

Answer

Check valves in heads prevent low-head drainage, where water drains out of the lowest heads in a zone after the valve closes, wasting water and causing puddles or erosion.

Question 5

Which irrigation method is generally the most water-efficient for trees and shrubs in a landscape?

Accepted Answer

Subsurface drip irrigation

Answer

Subsurface drip irrigation delivers water directly to the root zone with minimal evaporation or runoff losses, making it the most efficient delivery method for woody plants.

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LARE Test Practice Test

LARE LARE Irrigation Design 2