CAC Stream and Waterfall Construction 2

Question 1

What is the function of a weir box (spillway) at the top of an aquascape waterfall?

Accepted Answer

To create a uniform, consistent water sheet over the falls

Answer

A weir box distributes water evenly across its lip, producing a consistent sheet of water cascading over the falls for a polished aesthetic.

Question 2

Which factor most directly determines the pump size needed for a waterfall and stream feature?

Accepted Answer

The width of the waterfall spillway and total head height

Answer

Pump sizing is determined by calculating the desired flow rate (typically 100–150 GPH per inch of waterfall width) multiplied against the total head height.

Question 3

What is the purpose of 'keying in' a waterfall boulder into the liner during stream construction?

Accepted Answer

To prevent the boulder from sliding downhill and to seal water against the rock face

Answer

Keying in a boulder means pressing it into the liner so water hugs the rock face and flows over rather than channeling around or behind it.

Question 4

In multi-tier waterfall construction, what is the preferred method to transition water between tiers to minimize splash loss?

Accepted Answer

Overlapping liner sections with a 12-inch plunge pool between tiers

Answer

A small plunge pool shelf with overlapping liner between tiers catches water and redirects it to the next fall, reducing splash and water loss.

Question 5

Which rock type is most commonly recommended for aquascape waterfall and stream construction due to its natural appearance and water-safe properties?

Accepted Answer

Fieldstone or granite boulders

Answer

Fieldstone and granite boulders are water-safe, durable, and provide the natural, weathered appearance suited to aquascape aesthetics.

(CAC) Certified Aquascape Contractor Practice Test

(CAC) Certified Aquascape Contractor Practice Test

CAC Stream and Waterfall Construction 2