CSLB C-27 Landscaping ContractorIrrigation SystemsEasy
A landscape contractor is performing a routine inspection of an existing irrigation system. They notice significant water runoff and misting from several sprinkler heads in a zone that is operating at 75 PSI. The manufacturer's recommended operating pressure for these heads is 30-45 PSI. Which of the following is the most appropriate action to resolve this issue?
- AInstall a pressure-reducing valve (PRV) for the affected zone.
- BReplace all sprinkler heads with higher flow rate nozzles.
- CIncrease the flow rate to the zone to reduce pressure.
- DAdjust the individual sprinkler head nozzles to a wider spray pattern.
Show answer & explanationAnswer & explanation
Correct answer: A. Install a pressure-reducing valve (PRV) for the affected zone.
Excessive pressure causes misting and runoff, leading to water waste and poor distribution uniformity. Installing a pressure-reducing valve (PRV) for the zone will bring the pressure down to the manufacturer's recommended range, resolving the issue.
Why the other options are wrong
- B. Higher flow rate nozzles would increase water usage and potentially worsen runoff, not address the underlying high pressure.
- C. Increasing flow rate would likely increase pressure, exacerbating the problem.
- D. Adjusting spray patterns won't fix high pressure; it would still cause misting and runoff, just in a different pattern.
Pressure Regulation
The process of controlling and reducing water pressure in an irrigation system to ensure optimal performance of sprinkler heads and prevent issues like misting and runoff.
- High pressure causes misting, runoff, and poor distribution.
- PRVs (Pressure Reducing Valves) are used to lower pressure.
- Manufacturer specifications dictate optimal operating pressure.
Memory trick: High pressure makes sprinklers mist and hiss, a PRV will make it bliss.