Texas Irrigation License Exam Study
Guide 2025/2026 Exam Questions and
Verified Answers | Already Graded A+
Absorption Rate/ Infiltration Rate - 🧠ANSWER ✔✔The rate (or speed) at
which soil will accept water.
Actual Head Pressure - 🧠ANSWER ✔✔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 for Actual Head Pressure - 🧠ANSWER ✔✔Static Pressure - Total
Pressure Loss
Air Relief Valve - 🧠ANSWER ✔✔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
sucked into the line.
Application Rate/Precipitation Rate - 🧠ANSWER ✔✔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 for Application Rate - 🧠ANSWER ✔✔96.3 X Total GPM/ Total
Area
Water Audit - 🧠ANSWER ✔✔The most accurate method to evaluate
precipitation rates. You will collect water using catchment devices.
Arc - 🧠ANSWER ✔✔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 of Arc - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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 be caused by gravity (due to elevation)
or a pump.
Backsiphonage - 🧠ANSWER ✔✔A form of backflow due to negative or sub-
atmospheric pressure within the water system. Caused by a city main
break, or the fire department using water nearby for a fire.
Backflow Prevention Methods - 🧠ANSWER ✔✔1. Air Gap 2. Atmospheric
Vacuum Breaker (Not allowed in Texas) 3. Pressure Vacuum Breaker 4.
3
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
Guide 2025/2026 Exam Questions and
Verified Answers | Already Graded A+
Absorption Rate/ Infiltration Rate - 🧠ANSWER ✔✔The rate (or speed) at
which soil will accept water.
Actual Head Pressure - 🧠ANSWER ✔✔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 for Actual Head Pressure - 🧠ANSWER ✔✔Static Pressure - Total
Pressure Loss
Air Relief Valve - 🧠ANSWER ✔✔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
sucked into the line.
Application Rate/Precipitation Rate - 🧠ANSWER ✔✔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 for Application Rate - 🧠ANSWER ✔✔96.3 X Total GPM/ Total
Area
Water Audit - 🧠ANSWER ✔✔The most accurate method to evaluate
precipitation rates. You will collect water using catchment devices.
Arc - 🧠ANSWER ✔✔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 of Arc - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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 - 🧠ANSWER ✔✔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 be caused by gravity (due to elevation)
or a pump.
Backsiphonage - 🧠ANSWER ✔✔A form of backflow due to negative or sub-
atmospheric pressure within the water system. Caused by a city main
break, or the fire department using water nearby for a fire.
Backflow Prevention Methods - 🧠ANSWER ✔✔1. Air Gap 2. Atmospheric
Vacuum Breaker (Not allowed in Texas) 3. Pressure Vacuum Breaker 4.
3
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
