CLA CLA Irrigation & Water Management

Question 1

What does 'ET' stand for in irrigation scheduling, and why is it important?

Accepted Answer

Evapotranspiration — the combined water loss from soil evaporation and plant transpiration

Answer

Evapotranspiration (ET) measures total water loss from the landscape and is the primary basis for calculating how much supplemental irrigation is needed.

Question 2

Which irrigation head type delivers water directly to the root zone and is most efficient for water conservation?

Accepted Answer

Drip emitter

Answer

Drip emitters deliver water slowly at the root zone, minimizing evaporation and overspray losses and achieving application efficiencies of 90%+.

Question 3

What is the purpose of a backflow preventer in a landscape irrigation system?

Accepted Answer

Prevent irrigation water from flowing back into the potable water supply

Answer

A backflow preventer is a plumbing device required by code to protect the drinking water supply from contamination by irrigation system water.

Question 4

What does 'precipitation rate' mean for a sprinkler system, and in what unit is it expressed?

Accepted Answer

The rate at which water is applied to the landscape, expressed in inches per hour

Answer

Precipitation rate describes how quickly water accumulates on the soil surface, measured in inches per hour — it must match or be less than the soil infiltration rate to avoid runoff.

Question 5

A 'smart' irrigation controller adjusts watering schedules based on:

Accepted Answer

Weather data or soil moisture sensors to match actual plant water needs

Answer

Smart controllers use real-time ET data, weather forecasts, or in-ground soil sensors to automatically adjust run times, reducing water waste.

(CLA) Certified Landscape Architect Practice Test

(CLA) Certified Landscape Architect Practice Test

CLA CLA Irrigation & Water Management