CHT Irrigation & Water Management 2

Question 1

A rain sensor or rain shutoff device is used in irrigation systems to:

Accepted Answer

Automatically suspend irrigation during and after rainfall

Answer

Rain sensors detect rainfall and temporarily shut off the irrigation controller, preventing wasteful watering during and after rain events.

Question 2

What is 'water hammer' in irrigation systems?

Accepted Answer

A pressure surge caused by rapid valve closure

Answer

Water hammer is a pressure shock wave created when valves close rapidly, potentially damaging pipes, fittings, and heads in the irrigation system.

Question 3

In the US, which organization publishes water-efficient landscape standards relevant to CHT professionals?

Accepted Answer

EPA WaterSense

Answer

EPA WaterSense sets performance standards and certifies water-efficient irrigation products and practices widely referenced by horticulture professionals.

Question 4

Which irrigation scheduling method uses soil moisture sensors?

Accepted Answer

Soil moisture-based scheduling

Answer

Soil moisture-based scheduling uses sensors (tensiometers, capacitance probes) to trigger irrigation only when soil moisture falls below a set threshold.

Question 5

Drip emitters are typically rated by their flow rate in:

Accepted Answer

Gallons per hour (GPH)

Answer

Drip emitters deliver water very slowly and are rated in gallons per hour (GPH), with common rates of 0.5, 1, and 2 GPH.

CHT - Certified Horticultural Technician Practice Test

CHT - Certified Horticultural Technician Practice Test

CHT Irrigation & Water Management 2