CAC Stream and Waterfall Construction

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

To add decorative elevation to the surrounding landscape

Answer

To create a habitat for aquatic turtles

Answer

To support the weight of large boulders

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

Landscape fabric

Answer

Concrete board

Answer

Sand layer

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

Stacking boulders dry without mortar

Answer

Setting boulders on a concrete footing

Answer

Leaning boulders against the hillside at an angle

Question 4

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

Accepted Answer

12 inches

Answer

6 inches

Answer

24 inches

Answer

36 inches

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

In an above-ground holding tank

Answer

Inside the pump vault only

Answer

In a cistern placed uphill from the waterfall

Question 6

Which foam product is used in aquascape construction to seal gaps between rocks along a stream or waterfall?

Accepted Answer

Expanding polyurethane foam sealant

Answer

Silicone caulk

Answer

Hydraulic cement

Answer

Spray-on rubber coating

Question 7

When excavating a stream bed, what slope is generally recommended per linear foot to ensure consistent water movement?

Accepted Answer

1/2 inch per foot

Answer

1/8 inch per foot

Answer

2 inches per foot

Answer

4 inches per foot