TEXAS IRRIGATION TEST PAPER 2025/2026 QUESTIONS
AND ANSWERS RATED A+
✔✔Backsiphonage - ✔✔A form of backflow due to negative or sub-atmospheric
pressure within water system.
✔✔Backflow prevention methods - ✔✔Any approved device which prevents an
undesirable reversal of flow of water by the introduction of air, check valves, or a
combination of both.
✔✔Backflow prevention devices - ✔✔Air Gap
Atmospheric Vacuum Breaker (AVB)
Pressure Vacuum Breaker (PVB)
Double Check Valve Assembly (DCA)
Reduced Pressure Prevention Device (RP)
✔✔Ball Driven Heads - ✔✔Rotary sprinkler in which roatation is achieved by a steel ball
which is set into a circular motion by water passing through the head
✔✔Bubblers - ✔✔Similar to drip emitters except that they have a much higher flow rate
Flood a small area and the water continues to infiltrate into the soil after the bubbler has
been shutoff.
Applicable in areas where small basins can be constructed to contain the water and
where the soil is surface is level.
✔✔Bushing - ✔✔The pipe fitting used to change an irrigation component to a larger or
smaller size
✔✔C-factor - ✔✔Rating the smoothness inside of the pipe - higher the factor translates
to more smoothness
✔✔Check Valve - ✔✔A valve that allows flow in one direction only
✔✔Class Pipe - ✔✔Four classes used for piping and fittings receiving used water from
buildings. (Class 125-160-200-315)
Class 200 being the most common
✔✔Control Wires - ✔✔The wire that transmits the signals from automatic controller to
automatic electric valves to open and close the valves.
✔✔cross-connection - ✔✔Any actual or potential connection between a potable water
supply and any source of contamination or pollution
, ✔✔Design Pressure - ✔✔Sum total of the desired head pressure added to the total of
all pressure losses.
Design Pressure=Minimum head pressure + Total of all pressure losses
✔✔Desired Head Pressure - ✔✔The manufactures minimum recommended operating
pressure for a specific head.
✔✔Densogram - ✔✔Graphic representation of precipitation
✔✔ID/OD - ✔✔Inside diameter/Outside diameter
✔✔Direct burial wire - ✔✔Any wire approved for direct underground burial without
conduit.
✔✔Distribution Uniformity - ✔✔measure the uniformity of irrigation water over an area
(Generally rotary heads have better uniformity than spray heads)
✔✔Double Check Valve Assembly - ✔✔Backflow prevention assembly, using two shut
off valves and two check valves assembled and pre-tested at the factory, designed to
physically block or prevent the backflow of water
✔✔drip irrigation - ✔✔a method of supplying irrigation water through tubes that literally
drip water onto the soil at the base of each plant. 48" or less
✔✔Dry Line Shock (Dry Pipe Shock) - ✔✔Travel of unrestricted water flow in empty
piping
✔✔Dynamic pressure - ✔✔The force exerted by a fluid in motion
✔✔Dynamic water - ✔✔Water that is in motion through a system
✔✔Elevation gain - ✔✔Pressure gained as water is used downhill from its source
✔✔Elevation lost - ✔✔Pressure lost as water is used uphill from its source
✔✔Emitters - ✔✔Small mechanical device used in drip irrigation to limit water flow to a
drip or slow trickle
✔✔Evaporation - ✔✔The change of a substance from a liquid to a gas
✔✔Evapotranspiration (ET) - ✔✔loss of water by evaporation from the soil surface and
transpiration by plants
AND ANSWERS RATED A+
✔✔Backsiphonage - ✔✔A form of backflow due to negative or sub-atmospheric
pressure within water system.
✔✔Backflow prevention methods - ✔✔Any approved device which prevents an
undesirable reversal of flow of water by the introduction of air, check valves, or a
combination of both.
✔✔Backflow prevention devices - ✔✔Air Gap
Atmospheric Vacuum Breaker (AVB)
Pressure Vacuum Breaker (PVB)
Double Check Valve Assembly (DCA)
Reduced Pressure Prevention Device (RP)
✔✔Ball Driven Heads - ✔✔Rotary sprinkler in which roatation is achieved by a steel ball
which is set into a circular motion by water passing through the head
✔✔Bubblers - ✔✔Similar to drip emitters except that they have a much higher flow rate
Flood a small area and the water continues to infiltrate into the soil after the bubbler has
been shutoff.
Applicable in areas where small basins can be constructed to contain the water and
where the soil is surface is level.
✔✔Bushing - ✔✔The pipe fitting used to change an irrigation component to a larger or
smaller size
✔✔C-factor - ✔✔Rating the smoothness inside of the pipe - higher the factor translates
to more smoothness
✔✔Check Valve - ✔✔A valve that allows flow in one direction only
✔✔Class Pipe - ✔✔Four classes used for piping and fittings receiving used water from
buildings. (Class 125-160-200-315)
Class 200 being the most common
✔✔Control Wires - ✔✔The wire that transmits the signals from automatic controller to
automatic electric valves to open and close the valves.
✔✔cross-connection - ✔✔Any actual or potential connection between a potable water
supply and any source of contamination or pollution
, ✔✔Design Pressure - ✔✔Sum total of the desired head pressure added to the total of
all pressure losses.
Design Pressure=Minimum head pressure + Total of all pressure losses
✔✔Desired Head Pressure - ✔✔The manufactures minimum recommended operating
pressure for a specific head.
✔✔Densogram - ✔✔Graphic representation of precipitation
✔✔ID/OD - ✔✔Inside diameter/Outside diameter
✔✔Direct burial wire - ✔✔Any wire approved for direct underground burial without
conduit.
✔✔Distribution Uniformity - ✔✔measure the uniformity of irrigation water over an area
(Generally rotary heads have better uniformity than spray heads)
✔✔Double Check Valve Assembly - ✔✔Backflow prevention assembly, using two shut
off valves and two check valves assembled and pre-tested at the factory, designed to
physically block or prevent the backflow of water
✔✔drip irrigation - ✔✔a method of supplying irrigation water through tubes that literally
drip water onto the soil at the base of each plant. 48" or less
✔✔Dry Line Shock (Dry Pipe Shock) - ✔✔Travel of unrestricted water flow in empty
piping
✔✔Dynamic pressure - ✔✔The force exerted by a fluid in motion
✔✔Dynamic water - ✔✔Water that is in motion through a system
✔✔Elevation gain - ✔✔Pressure gained as water is used downhill from its source
✔✔Elevation lost - ✔✔Pressure lost as water is used uphill from its source
✔✔Emitters - ✔✔Small mechanical device used in drip irrigation to limit water flow to a
drip or slow trickle
✔✔Evaporation - ✔✔The change of a substance from a liquid to a gas
✔✔Evapotranspiration (ET) - ✔✔loss of water by evaporation from the soil surface and
transpiration by plants
