wets irrigation Questions with Correct
Answers
absorption rate - ANSWERSthe rate at which a soil will accept water. rate decreases as
soil "capacity" is reached. affected by soil type, slope, run-off.etc, also called percolation
rate and infiltration rate
actual head pressure - ANSWERSoperating pressure at the base of the sprinkler head.
calculated by subtracting all pressure losses, between the head and the pressure
source, from the static pressure at the source.
air gap - ANSWERSa complete physical separation between the free flowing discharge
end of a potable water supply pipeline and an open or non-pressure receiving vessel.
anti-siphon device - ANSWERSany device that introduces air into the system to prevent
"back siphonage". see definition for atmospheric vacuum breaker or pressure- type
vacuum breaker.
application rate - ANSWERSthe rate at which water is applied by the irrigation system. it
is usually measured in inches per hour. often referred to as precipitation rate. the
following formulas are used to calculate precipitation rate
arc - ANSWERSthe surface area of the landscape to which the head will provide water.
usually described in degrees or part of a circle. for example, a 90-degree arc would be a
quarter circle sprinkler.
as built plan - ANSWERSa corrected or redrawn plan (to scale) showing the actual
location of all major components of the system and other information the property owner
might require.
atmospheric vacuum breaker (avb) - ANSWERSan assembly containing an air inlet
valve, a check seat and an air inlet port. the flow of water into the body causes the air
inlet valve to close air inlet port. when the flow of water stops the air inlet valve falls and
forms a check against back siphonage. at the same time it opens the air inlet port
allowing air to enter and satisfy the vacuum. this device cannot be under constant
pressure(more that 12 hrs). it must be installed at least 6" higher that all downstream
piping and the highest downstream outlet. no back pressure may exist. no shut off
valves may be installed down-stream of the avb.
automatic control valve - ANSWERSan electric or hydraulic remote control valve in a
sprinkler system that is activated by an automatic controller. also called a section valve,
zone valve, or remote control valve.
, automatic system - ANSWERSan irrigation system which will automatically cycle
according to a preset program.
back pressure - ANSWERSany pressure, regardless of its source, against the outlet
side of the backflow prevention device, which exceeds the supply pressure against the
inlet side of the device. examples:pressure caused by gravity due to elevation
differences; a pump installed in the system ; or steam and/or air pressure.
back siphonage - ANSWERSa form of backflow due to negative or sub-atmospheric
pressure within a potable water system.
backflow - ANSWERSan undesired reversal of the flow of water in a piping system.
caused by back pressure or back siphonage.
Backflow prevention - ANSWERSThe mechanical prevention of reverse flow or back
siphonage ,of non-potable water from an irrigation system into the potable water source.
Backflow prevention assembly - ANSWERSAny 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 - ANSWERSA pump that is installed on the water supply line and is
designed to raise the operation pressure in the irrigation system.
Bushing - ANSWERSA pipe fitting used to change to either a large or smaller size.
Check valve - ANSWERSA valve that permits water to flow in one direction only.
Class pipe - ANSWERSA method by which pvc pipe is grouped according to the
working pressure. Class 160,class 200, class 315 are examples of classes of pipe
(class 200 pipe can be used where pressures do not exceed 200 psi)
Commission - ANSWERSThe texas commission on environmental quality
Consulting - ANSWERSThe act of providing advice, guidance, review or
recommendations related to landscape irrigation systems.
Contour line - ANSWERSA line of equal elevation drawn on a plan. for example, a
contour line they board "510" means that everywhere along that line is approximately
510 feet above mean sea level contour lines are usually accurate too plus or minus one
half of the contour interval that is when a contour interval of 1 foot is indicated on a plan
a particular contour line will be accurate to plus or minus 6 inches
Flow - ANSWERSThe movement of water in a piping system. often expressed in
gallons per minute or cubic feet per second
Answers
absorption rate - ANSWERSthe rate at which a soil will accept water. rate decreases as
soil "capacity" is reached. affected by soil type, slope, run-off.etc, also called percolation
rate and infiltration rate
actual head pressure - ANSWERSoperating pressure at the base of the sprinkler head.
calculated by subtracting all pressure losses, between the head and the pressure
source, from the static pressure at the source.
air gap - ANSWERSa complete physical separation between the free flowing discharge
end of a potable water supply pipeline and an open or non-pressure receiving vessel.
anti-siphon device - ANSWERSany device that introduces air into the system to prevent
"back siphonage". see definition for atmospheric vacuum breaker or pressure- type
vacuum breaker.
application rate - ANSWERSthe rate at which water is applied by the irrigation system. it
is usually measured in inches per hour. often referred to as precipitation rate. the
following formulas are used to calculate precipitation rate
arc - ANSWERSthe surface area of the landscape to which the head will provide water.
usually described in degrees or part of a circle. for example, a 90-degree arc would be a
quarter circle sprinkler.
as built plan - ANSWERSa corrected or redrawn plan (to scale) showing the actual
location of all major components of the system and other information the property owner
might require.
atmospheric vacuum breaker (avb) - ANSWERSan assembly containing an air inlet
valve, a check seat and an air inlet port. the flow of water into the body causes the air
inlet valve to close air inlet port. when the flow of water stops the air inlet valve falls and
forms a check against back siphonage. at the same time it opens the air inlet port
allowing air to enter and satisfy the vacuum. this device cannot be under constant
pressure(more that 12 hrs). it must be installed at least 6" higher that all downstream
piping and the highest downstream outlet. no back pressure may exist. no shut off
valves may be installed down-stream of the avb.
automatic control valve - ANSWERSan electric or hydraulic remote control valve in a
sprinkler system that is activated by an automatic controller. also called a section valve,
zone valve, or remote control valve.
, automatic system - ANSWERSan irrigation system which will automatically cycle
according to a preset program.
back pressure - ANSWERSany pressure, regardless of its source, against the outlet
side of the backflow prevention device, which exceeds the supply pressure against the
inlet side of the device. examples:pressure caused by gravity due to elevation
differences; a pump installed in the system ; or steam and/or air pressure.
back siphonage - ANSWERSa form of backflow due to negative or sub-atmospheric
pressure within a potable water system.
backflow - ANSWERSan undesired reversal of the flow of water in a piping system.
caused by back pressure or back siphonage.
Backflow prevention - ANSWERSThe mechanical prevention of reverse flow or back
siphonage ,of non-potable water from an irrigation system into the potable water source.
Backflow prevention assembly - ANSWERSAny 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 - ANSWERSA pump that is installed on the water supply line and is
designed to raise the operation pressure in the irrigation system.
Bushing - ANSWERSA pipe fitting used to change to either a large or smaller size.
Check valve - ANSWERSA valve that permits water to flow in one direction only.
Class pipe - ANSWERSA method by which pvc pipe is grouped according to the
working pressure. Class 160,class 200, class 315 are examples of classes of pipe
(class 200 pipe can be used where pressures do not exceed 200 psi)
Commission - ANSWERSThe texas commission on environmental quality
Consulting - ANSWERSThe act of providing advice, guidance, review or
recommendations related to landscape irrigation systems.
Contour line - ANSWERSA line of equal elevation drawn on a plan. for example, a
contour line they board "510" means that everywhere along that line is approximately
510 feet above mean sea level contour lines are usually accurate too plus or minus one
half of the contour interval that is when a contour interval of 1 foot is indicated on a plan
a particular contour line will be accurate to plus or minus 6 inches
Flow - ANSWERSThe movement of water in a piping system. often expressed in
gallons per minute or cubic feet per second
