CSLB C-27 Landscaping ContractorHardscape and FeaturesMedium
A landscape contractor is designing a waterfall feature for a client's pond. The client wants a natural-looking, continuous flow, and is concerned about water loss due to splash and evaporation. Which design element is most crucial for minimizing water loss and maintaining the pond's water level?
- AApplying a waterproof sealant to all visible rock surfaces.
- BConstructing the waterfall with large, flat rocks and minimal vertical drops.
- CIntegrating a large, shallow collection basin at the bottom.
- DUsing a high-volume, low-head pump.
Show answer & explanationAnswer & explanation
Correct answer: C. Integrating a large, shallow collection basin at the bottom.
A large, shallow collection basin (or pond) at the bottom of a waterfall feature is crucial for minimizing water loss. It reduces splash-out, allows for a greater surface area for water re-entry into the system, and provides a larger reservoir to buffer against daily evaporation, thus maintaining a more stable water level.
Why the other options are wrong
- A. Waterproof sealant prevents water absorption by rocks but does not mitigate water loss from splash or surface evaporation, which are the primary concerns for a waterfall feature.
- B. While large, flat rocks and minimal drops can reduce some splash, it's not as effective as a properly sized collection basin, and might compromise the aesthetic appeal of a waterfall.
- D. A high-volume pump is needed for flow, but a low-head pump might not create the desired waterfall height, and it doesn't directly minimize water loss from splash or evaporation.
Water Feature Water Loss Mitigation
Design strategies and components used in water features (like waterfalls) to reduce water loss from splash, evaporation, and leaks.
- Splash-out is a major source of loss.
- Evaporation is continuous.
- A large reservoir buffers against daily losses.
Memory trick: To keep the water in, make the catch basin WIDE and DEEP, like a big, thirsty mouth.