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
What is the primary purpose of installing a berm when constructing an aquascape stream?
Answer: To direct water flow and prevent seepage outside the liner
A berm channels water within the stream course and prevents liner water from escaping into the surrounding soil.
Which underlayment material is most commonly placed beneath EPDM liner in a stream or waterfall to prevent punctures?
Answer: Geotextile underlayment padding
Geotextile underlayment padding is specifically designed to cushion and protect EPDM liner from sharp rocks and roots underneath.
When stacking boulders to form a waterfall weir, which placement technique best prevents water from channeling behind the rocks?
Answer: Embedding the base of each boulder into foam-sealed liner
Embedding boulder bases into foam-sealed liner ensures water flows over and around rocks rather than seeping behind them and off the liner.
What is the recommended minimum overlap of EPDM liner at stream section joints to prevent leaks?
Answer: 12 inches
A 12-inch overlap at liner joints provides adequate coverage to prevent water from seeping through connection points as the ground shifts.
In a typical pondless waterfall installation, where is the primary water reservoir located?
Answer: Buried beneath the base of the waterfall in a gravel-filled basin
A pondless waterfall uses a gravel-filled underground basin at the base to store water while hiding the reservoir from view.
Which foam product is used in aquascape construction to seal gaps between rocks along a stream or waterfall?
Answer: Expanding polyurethane foam sealant
Expanding polyurethane foam sealant (such as black waterfall foam) fills voids between rocks, directing water flow over the intended surface.
When excavating a stream bed, what slope is generally recommended per linear foot to ensure consistent water movement?
Answer: 1/2 inch per foot
A slope of approximately 1/2 inch per linear foot provides enough gradient for natural-looking water movement without causing excessive velocity.