CAC Stream and Waterfall Construction 1

Question 1

What is the primary purpose of installing a berm when constructing an aquascape stream?

Accepted Answer

To direct water flow and prevent seepage outside the liner

Answer

A berm channels water within the stream course and prevents liner water from escaping into the surrounding soil.

Question 2

Which underlayment material is most commonly placed beneath EPDM liner in a stream or waterfall to prevent punctures?

Accepted Answer

Geotextile underlayment padding

Answer

Geotextile underlayment padding is specifically designed to cushion and protect EPDM liner from sharp rocks and roots underneath.

Question 3

When stacking boulders to form a waterfall weir, which placement technique best prevents water from channeling behind the rocks?

Accepted Answer

Embedding the base of each boulder into foam-sealed liner

Answer

Embedding boulder bases into foam-sealed liner ensures water flows over and around rocks rather than seeping behind them and off the liner.

Question 4

What is the recommended minimum overlap of EPDM liner at stream section joints to prevent leaks?

Accepted Answer

12 inches

Answer

A 12-inch overlap at liner joints provides adequate coverage to prevent water from seeping through connection points as the ground shifts.

Question 5

In a typical pondless waterfall installation, where is the primary water reservoir located?

Accepted Answer

Buried beneath the base of the waterfall in a gravel-filled basin

Answer

A pondless waterfall uses a gravel-filled underground basin at the base to store water while hiding the reservoir from view.

(CAC) Certified Aquascape Contractor Practice Test