TEXAS LANDSCAPE IRRIGATION 2024 UPDATE
COMPREHENSIVE QUESTIONS AND VERIFIED ANSWERS
EXAM TEST GRADE A+
Actual Head Pressure
The operating pressure measured at the base of a sprinkler head.
Actual head pressure formula
(Static pressure) - (Total pressure lost) = Actual head pressure
air gap
an approved Air gap is the unobstructed vertical distance through free atmosphere
between the lowest point of a water supply outlet and the flood level rim of the fixture or
assembly into which the outlet discharges. Physical seperation must be at least twice
the diameter of the water supply outlet but never less than 1"
Most common air gap?
Kitchen sink
Application Rate (Precipitation rate)
Rate at which water is applied by sprinkler heads in a certain pattern.
For irrigation contractors, water conservation starts with?
A great design
Three methods to evaluate application rate
Densogram, Precipitation rate formulas, Water audit
The proper watering time is early morning because?
Sprinkler patterns are generally less distorted from the wind
Pressure compensating devices help save water because they?
Help eliminate misting or fogging at the sprinkler heads
Landscape Irrigation
The art and management of applying water to landscape in a manner to encourage
growth of plant material and support water conservation
Irrigation sensors
(Measure rain, wind, soil moisture, and freeze) that save water and eliminate liability
issues concerning ice related accidents during freeing weather
Pressure Regulation Device
Devices which eliminate misting or fogging at the sprinkler heads, thus achieving better
uniformity and saving water
Hydrozoning
The practice of zoning an irrigation system based on similar plant material with similar
watering reguirements due to environmental and or geographic influences including, but
not limited to, soil type, slope, site orientation, and solar radiation
Licensed landscape irrigators
Responsibility to educate, promote, support and practice water conservation in the
landscape irrigation industry in order to preserve one of out most precious resources on
earth
Absorption Rate
The speed at which water can penetrate or infiltrate the soil
, 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
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