SRT Hydraulics & River Classification 2

Question 1

What feature is formed when fast-moving water drops over an obstruction and recirculates back upstream at the surface?

Accepted Answer

Hydraulic (hole)

Answer

A hydraulic, or hole, forms when water drops over a ledge and the surface current recirculates back upstream, creating a potentially entrapping feature.

Question 2

An eddy line is best described as the boundary between:

Accepted Answer

Downstream current and the upstream-flowing water behind an obstruction

Answer

An eddy line separates the downstream main current from the upstream-moving water that has swung behind an obstacle, creating a distinct shear zone.

Question 3

Pillow water on the upstream face of a rock is primarily caused by:

Accepted Answer

Water piling up as current is deflected around or over an obstacle

Answer

Pillow water forms when moving current slams into a rock and the water pressure builds and deflects upward and to the sides around the obstacle.

Question 4

Standing waves (haystacks) in a river are formed when:

Accepted Answer

Fast water enters a pool and decelerates, causing the water surface to oscillate

Answer

Standing waves form at the transition zone where fast water decelerates into slower water, creating stationary wave peaks that oscillate in height.

Question 5

What distinguishes a sieve from a strainer in swiftwater terminology?

Accepted Answer

A sieve involves fixed rock gaps; a strainer typically involves debris like logs or branches

Answer

Sieves are typically gaps in fixed rock formations, while strainers are debris (logs, branches, root balls) that allow water to pass but trap solid objects like swimmers.

(SRT) Swiftwater Rescue Technician Certification Practice Test

(SRT) Swiftwater Rescue Technician Certification Practice Test

SRT Hydraulics & River Classification 2