TEXAS LANDSCAPE IRRIGATION | TEXAS COMMISSION ON ENVIRONMENTAL
QUALITY | ACADEMIC YEAR 2026/2027 | COMPREHENSIVE LICENSING
EXAMINATION | VERIFIED QUESTIONS AND CORRECT ANSWER RATIONALES
1. Isolation valve - ANSWERS-A gate or ball valve, serves as a main shut-off device for
the complete irrigation system as needed for servicing or repair. Must be located
between the meter and the backflow devices.
2. Landscape irrigation - ANSWERS-Art and management of applying water to the
landscape in a manner to encourage the growth of plant material and support water
conservation.
3. Lateral Piping - ANSWERS-Piping between the remote control valve, not subject to
constant main line pressure, and the sprinkler head.
4. Loop Main Line - ANSWERS-A main line designed to provide water to any valve from
two or more directions. Generally improves hydraulics in larger landscapes.
5. Manifold - ANSWERS-A group of two or more control valves together in one location
and/or valve box.
6. Master valve - ANSWERS-Automatic or manual valve installed at the supply point
which controls water flow into the system main line piping.
7. Matched precipitation (MPR) - ANSWERS-All sprinkler heads within a watering zone
will produce similar precipitation rates, regardless of the pattern they cover.
8. MIP - ANSWERS-Male iron pipe
9. MIPT - ANSWERS-Male iron pipe thread
10. Non-potable water - ANSWERS-Water not safe for drinking, personal, or culinary
utilization.
11. Nozzle Tree - ANSWERS-Interchangeable nozzle assortment, with different GPM and
radii, provided with many rotary heads
12. POC - ANSWERS-Point of connection
13. Polyethylene Pipe (PE) - ANSWERS-Flexible plastic pipe which uses insert fittings.
14. Potable water - ANSWERS-water that is safe to drink
15. Precipitation rate - ANSWERS-Precipitation rate (PR) is a calculation of the flow rate
(application rate) over the square footage of the zone. 96.25 = constant that converts
gallons per minute (GPM) to inches per hour.
, 16. Pressure compensating - ANSWERS-A method of maintaining a constant discharge
pressure regardless of inlet pressure.
17. Pressure Regulator - ANSWERS-Mechanical device that lowers water pressure on the
downstream side of the unit.
18. Pressure Vacuum Breaker - ANSWERS-A backflow prevention assembly that
incorporates a spring-loaded check valve and introduces air into the system to
prevent "back siphonage"
19. P.S.I. - ANSWERS-Pounds per square inch
20. PVC pipe - ANSWERS-Poly vinyl chloride pipe.
21. Quick Coupler Valve - ANSWERS-A constantly pressurized valve set vertically in the
ground to provide supplemental water when a coupler key is inserted.
22. Radius - ANSWERS-The distance from the center of a circle to any point on the circle
23. Reduced pressure principle device (RP,RPZ, or RPP) - ANSWERS-Backflow prevention
device that consist of two independently acting check valves, together with an
automatic operating pressure differential relief valve located between the two check
valves.
24. Rotary heads - ANSWERS-Sprinkler heads that use the energy of the water to rotate
the sprinkler. Most common heads are impact, gear and ball driven heads.
25. Run-off - ANSWERS-water that is not absorbed into the ground, instead flows into
streams or other collection areas
26. Saddle - ANSWERS-A type of fitting which attaches around the pipe
27. Scheduling - ANSWERS-The process of calculating and managing the time and
amount of water to apply to a landscape
28. Schedule Pipe - ANSWERS-A classification system for pipe designating standard wall
thickness for all sizes in which the pipe is made.
29. S.D.R. - ANSWERS-Standard dimension ratio
30. Sensors - ANSWERS-Refers to four types of irrigation sensor units that assist in water
conservation
31. 4 types of irrigaiton sensors - ANSWERS-Freeze
• Rain
• Wind
• Soil moisture
QUALITY | ACADEMIC YEAR 2026/2027 | COMPREHENSIVE LICENSING
EXAMINATION | VERIFIED QUESTIONS AND CORRECT ANSWER RATIONALES
1. Isolation valve - ANSWERS-A gate or ball valve, serves as a main shut-off device for
the complete irrigation system as needed for servicing or repair. Must be located
between the meter and the backflow devices.
2. Landscape irrigation - ANSWERS-Art and management of applying water to the
landscape in a manner to encourage the growth of plant material and support water
conservation.
3. Lateral Piping - ANSWERS-Piping between the remote control valve, not subject to
constant main line pressure, and the sprinkler head.
4. Loop Main Line - ANSWERS-A main line designed to provide water to any valve from
two or more directions. Generally improves hydraulics in larger landscapes.
5. Manifold - ANSWERS-A group of two or more control valves together in one location
and/or valve box.
6. Master valve - ANSWERS-Automatic or manual valve installed at the supply point
which controls water flow into the system main line piping.
7. Matched precipitation (MPR) - ANSWERS-All sprinkler heads within a watering zone
will produce similar precipitation rates, regardless of the pattern they cover.
8. MIP - ANSWERS-Male iron pipe
9. MIPT - ANSWERS-Male iron pipe thread
10. Non-potable water - ANSWERS-Water not safe for drinking, personal, or culinary
utilization.
11. Nozzle Tree - ANSWERS-Interchangeable nozzle assortment, with different GPM and
radii, provided with many rotary heads
12. POC - ANSWERS-Point of connection
13. Polyethylene Pipe (PE) - ANSWERS-Flexible plastic pipe which uses insert fittings.
14. Potable water - ANSWERS-water that is safe to drink
15. Precipitation rate - ANSWERS-Precipitation rate (PR) is a calculation of the flow rate
(application rate) over the square footage of the zone. 96.25 = constant that converts
gallons per minute (GPM) to inches per hour.
, 16. Pressure compensating - ANSWERS-A method of maintaining a constant discharge
pressure regardless of inlet pressure.
17. Pressure Regulator - ANSWERS-Mechanical device that lowers water pressure on the
downstream side of the unit.
18. Pressure Vacuum Breaker - ANSWERS-A backflow prevention assembly that
incorporates a spring-loaded check valve and introduces air into the system to
prevent "back siphonage"
19. P.S.I. - ANSWERS-Pounds per square inch
20. PVC pipe - ANSWERS-Poly vinyl chloride pipe.
21. Quick Coupler Valve - ANSWERS-A constantly pressurized valve set vertically in the
ground to provide supplemental water when a coupler key is inserted.
22. Radius - ANSWERS-The distance from the center of a circle to any point on the circle
23. Reduced pressure principle device (RP,RPZ, or RPP) - ANSWERS-Backflow prevention
device that consist of two independently acting check valves, together with an
automatic operating pressure differential relief valve located between the two check
valves.
24. Rotary heads - ANSWERS-Sprinkler heads that use the energy of the water to rotate
the sprinkler. Most common heads are impact, gear and ball driven heads.
25. Run-off - ANSWERS-water that is not absorbed into the ground, instead flows into
streams or other collection areas
26. Saddle - ANSWERS-A type of fitting which attaches around the pipe
27. Scheduling - ANSWERS-The process of calculating and managing the time and
amount of water to apply to a landscape
28. Schedule Pipe - ANSWERS-A classification system for pipe designating standard wall
thickness for all sizes in which the pipe is made.
29. S.D.R. - ANSWERS-Standard dimension ratio
30. Sensors - ANSWERS-Refers to four types of irrigation sensor units that assist in water
conservation
31. 4 types of irrigaiton sensors - ANSWERS-Freeze
• Rain
• Wind
• Soil moisture
