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Texas Irrigator License Study Guide – Questions With Solutions
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Texas Irrigator License Study Guide – Questions WithSolutions
Absorption Rate/ Infiltration Rate Right Ans - The rate (or speed) at which
soil will accept water.
Actual Head Pressure Right Ans - The operating pressure measured at the
base of a sprinkler head. It must be equal to or greater than minimum head
pressure to function correctly.
Formula: Static Pressure-Total Pressure Loss
Air Relief Valve Right Ans - Small device used on some drip irrigation that
allows air into the dripline when the system is not running which eliminates
any vacuum that could result in debris or contaminants being sucking into the
line.
Application Rate/Precipitation Rate Right Ans - Rate at which water is
applied by sprinkler heads in a certain pattern. Measure in inches per hours,
gallons per hours, or gallons per day.
Formula: 96.3 X Total GPM/ Total Area
Water Audit Right Ans - The most accurate method to evaluate
precipitation rates. You will collect water using catchment devices.
Arc Right Ans - The surface area of the landscape to which a sprinkler head
will provide water. Described in degrees or part of a full circle (360 degrees).
Example: a 90 degree arc would be a quarter circle head, a 180 degree arc
would be a half circle head, a 360 degree arc would be a full circle head.
As-Built Plan Right Ans - A corrected or redrawn plan showing the "actual
scaled" location of all major components of the system and other information
the property owner might require. Zone valves are the most important
component to locate.
, Atmospheric Vacuum Breaker Right Ans - A backflow prevention device
that allows air into the piping system, with the use of a float that moves up
and down, to prevent backsiphonage. This is no longer allowed in Texas.
Backflow Right Ans - An unwanted reversal of the flow of water in a piping
system which can potentially allow non-potable water to pollute or
contaminate the potable water supply.
Backpressure Right Ans - Any condition that could create pressure in the
discharge side of the piping system that is greater than that of the supply side
of the system. This can because by gravity (due to elevation) or a pump.
Backsiphonage Right Ans - A form of backflow due to negative or sub-
atmospheric pressure within the water system. Caused by a city main like
break, or the fire department using water nearby for a fire.
Backflow Prevention Methods Right Ans - 1. Air Gap
2. Atmospheric Vacuum Breaker (Not allowed in Texas)
3. Pressure Vacuum Breaker
4. Spill Resistant Pressure Vacuum Breaker
5. Double Check Valve Assembly
6. Reduced Pressure Principle Assembly
Check Valve Right Ans - A valve which permits water to flow in one
direction only. These devices are usually located within the sprinkler head for
the purpose of preventing water in the piping to drain out of the sprinkler
heads when the system is off.
Class Pipe Right Ans - PVC pipe is groups according to the working
pressure. All sizes within a class have the same working pressure.
Controller Right Ans - An automatic timing device, which signals the
automatic valves to open or close according to the prescribed program.
Design Pressure Right Ans - The sum total of the desired head pressure
added to the total of all pressure losses.
Formula: Minimum Head Pressure + Total Pressure Losses
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