Stream and Waterfall Construction Flashcards
7 cards from real CAC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Stream and Waterfall Construction flashcards as text
Which tool is most commonly used on a job site to level the top edge of a stream berm before liner installation?
Answer: Rotary laser level
A rotary laser level allows installers to quickly establish a consistent grade around the entire stream perimeter, ensuring the berm is level to prevent liner overflow.
How does installing a check valve on the pump discharge line benefit a stream and waterfall system?
Answer: It prevents backflow from draining the feature when the pump shuts off
A check valve closes when the pump stops, preventing water from siphoning back through the pump and draining the stream or waterfall basin.
What is a 'disappearing stream' in aquascape terminology?
Answer: A stream feature where water flows into a hidden below-grade basin rather than a visible pond
A disappearing stream is designed so the water collects in a gravel-filled underground basin at the stream's end, creating the illusion that the stream vanishes.
During stream construction on a slope with unstable soil, which technique prevents the liner from shifting downhill over time?
Answer: Using a soil anchor trench at the stream header and along the berm edges
Burying the liner in anchor trenches at the header and berm edges locks it in place and prevents gravity from pulling the liner downhill as soil settles.
What is the recommended practice when two sections of EPDM liner must be seam-bonded together in a stream?
Answer: Clean, prime, and bond with EPDM splice tape and seam primer per manufacturer specs
A proper EPDM seam requires cleaning, applying seam primer, and bonding with EPDM-specific splice tape to ensure a watertight, long-lasting connection.
When creating naturalistic bends in a constructed stream, what design principle helps determine where curves should be placed?
Answer: Curves should occur where the slope changes or at boulder outcroppings, mimicking natural geology
Natural streams curve in response to changes in slope and the presence of rock outcroppings, so replicating these conditions creates the most realistic aesthetic.
After completing stream and waterfall construction, what is the first operational test that should be performed before backfilling and finishing the site?
Answer: Fill the system and run the pump for 24 hours to check for leaks and confirm water level stability
A 24-hour pump run with a full water level check identifies any leaks, liner folds channeling water out, or pump sizing issues before the site is finished.