Under 18VAC50-22-30, what work does Virginia landscape irrigation contracting (ISC) authorize?
Isc Scope
Question · Easy
What official abbreviation does 18VAC50-22-30 assign to landscape irrigation contracting?
Besides an ISC specialty, which Virginia license classifications also provide landscape irrigation functions under 18VAC50-22-30?
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When may an ISC specialty contractor install a backflow prevention device on an irrigation job?
Question · Medium
How does landscape irrigation contracting (ISC) differ from landscape service contracting (LSC) under 18VAC50-22-30?
A Virginia firm holds only a CBC classification. Does that classification, by itself, authorize landscape irrigation sprinkler installation?
Which of the following is inside the ISC specialty as written in 18VAC50-22-30?
Why is a water-based building fire-sprinkler system outside the ISC specialty?
An ISC Qualified Individual is asked to replace a kitchen sink, trap, and branch drain while on site to repair a lawn sprinkler. What is the correct scope decision?
Which system is clearly inside the ISC definition of outdoor sprinkler systems?
What does incidental mean in the 18VAC50-22-30 sentence that lets ISC install backflow prevention devices?
Question · Hard
How many years of classification-specific experience must the ISC Qualified Individual document for Class C, Class B, and Class A?
On an irrigation plan, what does GPM measure?
Hydraulics Pressure Flow
When is static water pressure measured at an irrigation point of connection?
How many feet of water head equal 1 psi?
A Virginia lawn zone climbs 23 ft from the point of connection to the highest head. About how much pressure is lost to elevation alone?
A rotor zone has four full-circle heads at 6.0 GPM each and two half-circle heads at 3.0 GPM each, all running together. What is the zone demand?
Using PR = (96.3 × GPM) / (S × L), what is the precipitation rate of a 1.50 GPM spray on 15 ft by 15 ft square spacing?
Why is working (dynamic) pressure at the last head lower than static pressure at the meter?
Static pressure at the meter is 72 psi. Estimated losses while the zone runs are 5 psi (meter), 11 psi (backflow), 8 psi (elevation), and 14 psi (pipe and fittings). What residual pressure remains for the heads?
If pipe diameter and length stay the same, what happens to friction loss when zone flow increases?
Why do irrigation designers commonly limit PVC mainline velocity to about 5 ft/s?
Using V = 0.4085 × Q ÷ d², what is the velocity in 1-1/2 in Schedule 40 PVC (inside diameter 1.610 in) carrying 30 GPM?
A lateral drops 12 ft from the valve to the lowest head. About how much pressure is gained from elevation?
A zone is designed for 40 psi at the heads. Using the common 20 percent pressure-variation guideline, what is the acceptable pressure range in that zone?
What Hazen–Williams C-factor is normally used for new smooth PVC irrigation pipe?
A spray zone applies 0.80 in/hr. The turf needs 0.40 in in this irrigation cycle. How long should the station run, ignoring efficiency?
What is the most common cause of water hammer on an irrigation main?
Compared with a typical pop-up spray head, a gear-driven rotor usually has which combination of operating pressure and radius?
Sprinkler Heads Rotors Drip
What does head-to-head coverage mean in landscape irrigation layout?
A matched-precipitation nozzle set lists 4.0 GPM for a full circle, 2.0 GPM for a half, and 1.0 GPM for a quarter at the same radius. Why are those flows matched?
Why should pop-up sprays and gear-driven rotors not share the same valve?
What is the main reason to specify in-head check valves (SAM-style) on a sloped Virginia lawn?
A full-circle rotor discharges 4.0 GPM on 30 ft by 30 ft square spacing. What is the precipitation rate?
What is a multi-stream rotary nozzle (often called an MP rotator style) designed to do compared with a conventional spray nozzle in the same body?
Drip emitters are usually cataloged in which flow unit?
A drip zone has 36 emitters at 2.0 GPH each. What is the zone flow in GPM?
Which grouping is the best hydrozone for a single irrigation station?
When is cycle-and-soak programming the right choice for a Virginia spray zone?
If a spray nozzle is replaced with a larger orifice at the same pressure, what happens to flow and radius?
Why are swing joints or funny pipe specified under pop-up heads?
Distribution uniformity (DU) is low on a newly installed turf zone. Which field check is the most direct first step?
What voltage do typical residential irrigation solenoids and controllers use?
Valves Controllers Wiring
In a conventional multi-wire irrigation system, what does the common wire do?
What is the primary purpose of a master valve on an irrigation main?
Why are electric remote-control valves installed in valve boxes rather than buried in bare soil?
How should a rain or freeze sensor be wired on a conventional controller?
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