Texas Irrigation Technician Exam
question and answers
Backflow prevention✔✔A mechanical means to prevent a backflow
A backflow device✔✔Any approved device that prevents an undesireable reversal of
flow of water
1 column foot of water✔✔.443 psi (pretty close to 5 ft.
1 psi✔✔requires a column of water 2.31 feet tall (or 3 ft.) (or 27.75 in.)
max flowrate for 1/2 in pipe (to stay below 5 fps)✔✔5 gpm
max flowrate for 3/4 in pipe (to stay below 5 fps)✔✔10 gpm
max flowrate for 1 in pipe (to stay below 5 fps)✔✔15 gpm
max flowrate 1 1/4 in. pipe (to stay below 5 fps)✔✔25 gpm
max flowrate for 1 1/2 in pipe (to stay below 5 fps)✔✔35 gpm
Key requirement for RPZ backflow✔✔minimum of 12" above grade
Key requirement for Double Check backflow (DCVA)✔✔If installed below grade, Test
cocks must be plugged with non-ferrous (non-magnetic) material
Key requirements for PVB and SVB✔✔Must be 12" above highest head, valve, pipe,
fitting, or fixture
Key requirements for Air Gap✔✔The recieving pipe must be 1" wider or 2 times
bigger than the discharge pipe
zone flow✔✔how many gallons go through a zone
Backflow Prevention Assembly✔✔Any assembly used to prevent backflow into a
potable water system. The type of assembly used is based on the existing or
potential degree of health hazard and backflow condition.
booster pump✔✔increases operating pressure
Bushing✔✔The method of adapting a fitting to either a larger or smaller size.
, Check Valve✔✔A valve that allows flow in one direction but Who composes the
Irrigator Council?✔✔6 Irrigators, 3 Public members, all from the same state
What is the purpose of the Irrigator Council?✔✔Provide advice on matters
concerning irrigation
Possible consequence of installing a system w/o a license?✔✔Being charged with a
Class C misdemeanor
Absorption Rate✔✔How fast a rate at which the soil will accept water
Actual Head Pressure✔✔The operating pressure measured at the base of a
sprinkler head
How to CALCULATE Actual head pressure?✔✔subtract all pressure losses from
static pressure
air gap✔✔A complete physical separation between the free flowing discharge end of
a potable water supply pipeline and an open or non-pressure recieveing vessel
Application Rate✔✔Rate that a head applies water to the area it's spraying
What term is Application rate synonymous with?✔✔Precipitation Rate
Arc✔✔The surface area of the landscape that the head will provide water (half, full,
90, 25)
as-built plans✔✔A corrected or redrawn plan, showing location of all major
components of a system
A.W.W.A.✔✔American Water Works Association
Backflow✔✔The UNDESIREABLE reverse flow of water in a piping system
Back pressure✔✔Condition that can happen due to elevation pumps, pressure
Back siphonage✔✔backflow due to a sub atomic pressure (break in city main, fire
hydrant being used
prevents flow in the opposite direction.
Completion of irrigation system✔✔All standards are met and the irrigator is satisfied
Class Pipe✔✔Class = How many pounds of pressure it can withstand before the
pipe bursts
question and answers
Backflow prevention✔✔A mechanical means to prevent a backflow
A backflow device✔✔Any approved device that prevents an undesireable reversal of
flow of water
1 column foot of water✔✔.443 psi (pretty close to 5 ft.
1 psi✔✔requires a column of water 2.31 feet tall (or 3 ft.) (or 27.75 in.)
max flowrate for 1/2 in pipe (to stay below 5 fps)✔✔5 gpm
max flowrate for 3/4 in pipe (to stay below 5 fps)✔✔10 gpm
max flowrate for 1 in pipe (to stay below 5 fps)✔✔15 gpm
max flowrate 1 1/4 in. pipe (to stay below 5 fps)✔✔25 gpm
max flowrate for 1 1/2 in pipe (to stay below 5 fps)✔✔35 gpm
Key requirement for RPZ backflow✔✔minimum of 12" above grade
Key requirement for Double Check backflow (DCVA)✔✔If installed below grade, Test
cocks must be plugged with non-ferrous (non-magnetic) material
Key requirements for PVB and SVB✔✔Must be 12" above highest head, valve, pipe,
fitting, or fixture
Key requirements for Air Gap✔✔The recieving pipe must be 1" wider or 2 times
bigger than the discharge pipe
zone flow✔✔how many gallons go through a zone
Backflow Prevention Assembly✔✔Any assembly used to prevent backflow into a
potable water system. The type of assembly used is based on the existing or
potential degree of health hazard and backflow condition.
booster pump✔✔increases operating pressure
Bushing✔✔The method of adapting a fitting to either a larger or smaller size.
, Check Valve✔✔A valve that allows flow in one direction but Who composes the
Irrigator Council?✔✔6 Irrigators, 3 Public members, all from the same state
What is the purpose of the Irrigator Council?✔✔Provide advice on matters
concerning irrigation
Possible consequence of installing a system w/o a license?✔✔Being charged with a
Class C misdemeanor
Absorption Rate✔✔How fast a rate at which the soil will accept water
Actual Head Pressure✔✔The operating pressure measured at the base of a
sprinkler head
How to CALCULATE Actual head pressure?✔✔subtract all pressure losses from
static pressure
air gap✔✔A complete physical separation between the free flowing discharge end of
a potable water supply pipeline and an open or non-pressure recieveing vessel
Application Rate✔✔Rate that a head applies water to the area it's spraying
What term is Application rate synonymous with?✔✔Precipitation Rate
Arc✔✔The surface area of the landscape that the head will provide water (half, full,
90, 25)
as-built plans✔✔A corrected or redrawn plan, showing location of all major
components of a system
A.W.W.A.✔✔American Water Works Association
Backflow✔✔The UNDESIREABLE reverse flow of water in a piping system
Back pressure✔✔Condition that can happen due to elevation pumps, pressure
Back siphonage✔✔backflow due to a sub atomic pressure (break in city main, fire
hydrant being used
prevents flow in the opposite direction.
Completion of irrigation system✔✔All standards are met and the irrigator is satisfied
Class Pipe✔✔Class = How many pounds of pressure it can withstand before the
pipe bursts
