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Backflow Prevention Design Requirements for Sprinkler
Systems
Before installing a new sprinkler system that will use domestic
water, you are required to get a building permit from Mesa County
Building Department. For more information about the permit, call
information line at (970) 244-1631. Click here to view the Home
Irrigation Systems Installation Guide.
Maximum design flow for residential systems on a ¾"
service and meter should not exceed 15 gallons per minute (gpm).
Higher flows can damage the meter. Call the Cross Connection Control
Coordinator (256-4101) for information regarding flows for larger meters.
All devices should be installed in a manner that allows adequate
clearance for testing and repairs.
| Atmospheric
Vacuum Breaker Assembly (AVBA) |
- An AVB must be installed on each irrigation zone.
- Control valves (on/off valves) are not allowed downstream
of (after) an AVB.
- Each AVB must be installed a minimum of 6" above
the highest point of water in the zone it serves.
- No chemical or fertilizer may be introduced into a sprinkler
system equipped with AVBs.
- No pumps or backpressure sources are permitted on downstream
side of (after) an AVB.
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| Pressure
Vacuum Breaker Assembly (PVBA)
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- Only one PVB is required to serve the whole system. Control
valves may be located downstream of (after) the PVB.
- PVBAs must be installed a minimum of 12" above the
highest point of water they serve.
- PVBAs must be tested by a state-certified backflow preventer
tester at the time of installation, annually, and when moved
or repaired. Call the Cross Connection Control
Coordinator to receive a list of approved
testers.
- No chemical or fertilizer may be introduced into an irrigation
system equipped with PVBAs.
- No pumps or backpressure sources are permitted on the
downstream side of (after) a PVBA.
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| Reduced
Pressure Backflow Assembly (RPBA) |
- Only one RPBA is required to serve the whole system; control
valves can be located downstream of (after) the RPBA.
- RPBAs must be installed a minimum of 12" above ground
level.
- RPBAs must be tested by a state certified backflow preventer
tester at the time of installation, annually, and when moved
or repaired. Call the Cross Connection Control
Coordinator to receive a list of approved
testers.
- In an RPBA-equipped system, fertilizer and other agricultural
chemicals may be introduced downstream of (after) the RPBA.
- Basement installations are all right as long as proper
drainage and high water alarms exist.
- All sprinkler systems must be equipped with a backflow
preventer. Call the Cross Connection Control
Coordinator for a list of approved backflow
preventers, because not all devices sold locally are approved
for use.
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All sprinkler systems must be equipped with a backflow preventer.
Call the Cross Connection Control Coordinator
for a list of approved backflow preventers,
because not all devices sold locally are approved for use. |
Call the Water Services Cross Connection Control Coordinator at (970) 256-4101 for more information or to receive a list
of state certified testers. |
This page updated August 25, 2008
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