CSLB C-27 Landscaping ContractorPlanting and LandscapingHard
A landscape contractor is retrofitting an existing overhead spray irrigation system in a commercial landscape to meet California's Model Water Efficient Landscape Ordinance (MWELO) requirements. The primary goal is to reduce water use significantly while maintaining plant health. Which of the following strategies would be the MOST effective initial step to achieve this goal?
- AInstall a new, larger master valve for increased flow control.
- BIncrease the frequency of irrigation cycles with shorter run times.
- CConvert spray zones to drip irrigation where appropriate.
- DReplace all spray nozzles with high-flow rotary nozzles.
Show answer & explanationAnswer & explanation
Correct answer: C. Convert spray zones to drip irrigation where appropriate.
Converting spray zones to drip irrigation is often the most effective initial step for significant water savings, especially in shrub and groundcover areas. Drip irrigation delivers water directly to the root zone, drastically reducing evaporation, overspray, and runoff, which is a core principle of MWELO.
Why the other options are wrong
- A. A new master valve primarily controls water flow to the system, not directly reducing water use at the point of application.
- B. Increasing frequency with shorter run times can lead to more evaporation and less deep watering, potentially increasing overall water use or stressing plants, rather than reducing it significantly.
- D. High-flow rotary nozzles, while more efficient than older sprays, would still use more water and have higher evaporation/runoff than a drip system.
MWELO Irrigation Retrofit
Modifying existing irrigation systems to comply with California's Model Water Efficient Landscape Ordinance, focusing on reducing water consumption through improved efficiency.
- Prioritizes drip irrigation and efficient spray nozzles.
- Requires smart controllers and proper hydrozoning.
- Aims to minimize runoff, overspray, and evaporation.
Memory trick: Drip for the win! Direct, Deep, Dry-air-proof.