What is the first step when designing a new residential irrigation system?
Pre Construction Design
Question · Easy
How deep before you need a trench box?
Short
Which statement correctly compares static and dynamic water pressure in an irrigation system?
Hydraulics
Four rotor heads each deliver 2.0 GPM over a 40 ft by 40 ft zone. Using PR = 96.25 × total GPM ÷ area (sq ft), what is the precipitation rate?
Question · Medium
Trades Exam Prep Podcast
Listen on Spotify
Podcast
For a rotor rated with a 35 ft radius, what is the maximum square spacing that still provides head-to-head coverage?
Sprinkler Selection
Why is triangular spacing often preferred over square spacing for sprinkler layout?
Which irrigation method is most appropriate for a narrow planting bed containing individual shrubs and trees?
A 1 inch main runs 200 ft carrying 12 GPM. Friction loss in this pipe is 4.0 ft of head per 100 ft. What is the total friction loss over the run?
An irrigation guideline limits water velocity in PVC pipe to about 5 ft/s to avoid water hammer. At 8 GPM, 1 inch Schedule 40 PVC flows at about 3.2 ft/s. Is the pipe sized acceptably?
Pipe Sizing
A zone mixes 1.0 GPM nozzles and 0.5 GPM nozzles, all on 15 ft square spacing, running for the same time. What is the result?
Question · Hard
Which items should a plot plan used for irrigation design show?
What is the most reliable way to determine available flow from a municipal supply for irrigation design?
Pressure in a system with no water moving is called:
Why are irrigation systems divided into zones rather than running all heads at once?
A water source provides 10 GPM at 40 psi. Each spray head in a zone uses 2 GPM. Ignoring small losses, what is the maximum number of heads per zone?
A site has 90 psi static pressure from the utility, but spray heads are rated for 30 psi operation. What must the design include?
Water pressure changes about 0.433 psi per foot of elevation change. If a head is 20 ft above the water source, how much static pressure is lost going uphill?
In an irrigation system, the mainline is the pipe that:
Which pipe material is most common for buried irrigation laterals on Florida residential systems?
Where should zone control valves be installed?
Where in the system must the backflow preventer be located?
Backflow Prevention
Before connecting a new irrigation system to a public water supply in Florida, the contractor should:
Rules Laws Codes
Per the DBPR reference list valid January 2026 through December 2026, which three references may be brought into the Irrigation trade exam?
Before trenching on a Florida site, what must the contractor do?
Grouping plants with similar water needs into the same irrigation zone is called:
A turf zone must receive 0.5 in of water per week. The zone applies 0.5 in/hr at 80% efficiency. How many hours of runtime per week are needed?
Scheduling Water Conservation
When trenching for irrigation pipe, the trench bottom should be:
Construction Installation
Under OSHA 29 CFR 1926 Subpart P, trenches of what depth require a protective system such as sloping, shoring, or shielding?
OSHA excavation standards require spoil piles and excavated material to be kept at least how far from the edge of a trench?
In any trench 4 ft or deeper, OSHA requires a ladder, ramp, or other safe means of egress within how many feet of lateral travel?
PVC irrigation pipe is most commonly joined using:
After solvent-welding a PVC joint, what must be done before pressurizing the line?
A layer of sand or fine gravel placed under and around pipe in a rocky trench is called:
The two wires connecting an irrigation controller to a zone solenoid valve are the:
Which wire size is commonly used for residential irrigation valve control wiring?
Underground wire splices for irrigation valve wiring must be made using:
How does an electric solenoid irrigation valve open when its zone is called?
Which valve type is most common for automatic zone control in residential irrigation?
Pop-up spray heads are used mainly in:
How should a pop-up spray head be set relative to finish grade?
Compared with spray heads, gear-driven rotors are best described as:
On an adjustable-arc sprinkler nozzle, the arc adjustment controls:
A full-circle nozzle delivers 2.0 GPM on 15 ft square spacing. For matched precipitation, what should a half-circle nozzle on the same spacing deliver?
A 1 GPH pressure-compensating drip emitter delivers:
Why do drip irrigation systems require a filter?
The purpose of a pressure-compensating emitter is to:
A drip zone has 50 emitters each rated at 1 GPH. What is the total zone flow in GPM?
Loading more…