Texas Landscape Irrigation Questions and Answers Verified Answers
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Course
Texas Irrigation
Institution
Texas Irrigation
Texas Landscape Irrigation Questions and Answers Verified Answers
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 ...
Texas Landscape Irrigation Questions and
Answers Verified Answers
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
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
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.
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.
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