2025 LANDSCAPE IRRIGATION STUDY GUIDE EXAM EVALUATION
QUESTIONS WITH ANSWERS 2025/2026 GRADED A+
The proper watering time is early morning because? - Sprinkler patterns are generally
less distorted from the wind
arc - Degrees of coverage of a sprinkler from one side of a pattern to the other
The art and management of applying water to the landscape to encourage the growth of
plant material and support water conservation is? - Landscape Irrigation
Atmospheric Vacuum Breaker (AVB) - Backflow prevention device that allows air into
the piping system, with the use of a float that moves up and down, to prevent
backsiphonage.
Cannot be under constant pressure for more than 12 hours in one 24 hour window.
A minimum of 6" higher than all down stream piping.
A separate AVB must be installed on the discharge side of each control valve, between
the valve and all emission devices.
Automatic control valve - An electrical or hydraulic remote control valve in a sprinkler
system which is activated by an automatic controller
Backflow - 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 - 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.
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
QUESTIONS WITH ANSWERS 2025/2026 GRADED A+
The proper watering time is early morning because? - Sprinkler patterns are generally
less distorted from the wind
arc - Degrees of coverage of a sprinkler from one side of a pattern to the other
The art and management of applying water to the landscape to encourage the growth of
plant material and support water conservation is? - Landscape Irrigation
Atmospheric Vacuum Breaker (AVB) - Backflow prevention device that allows air into
the piping system, with the use of a float that moves up and down, to prevent
backsiphonage.
Cannot be under constant pressure for more than 12 hours in one 24 hour window.
A minimum of 6" higher than all down stream piping.
A separate AVB must be installed on the discharge side of each control valve, between
the valve and all emission devices.
Automatic control valve - An electrical or hydraulic remote control valve in a sprinkler
system which is activated by an automatic controller
Backflow - 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 - 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.
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
