SAF Water Quality & Management 3

Question 1

Which stream order classification system is most commonly used in watershed analysis for forestry applications?

Accepted Answer

Horton-Strahler ordering system

Answer

The Horton-Strahler ordering system assigns numerical orders to stream segments based on tributary junctions and is standard for watershed analysis.

Question 2

Thermal pollution in streams adjacent to harvested areas is primarily caused by:

Accepted Answer

Loss of riparian canopy shade allowing solar radiation to heat water

Answer

Removal of riparian canopy exposes stream surfaces to direct solar radiation, causing significant temperature increases that stress cold-water fish species.

Question 3

What is the recommended minimum width for a riparian buffer zone on perennial streams in most state forestry BMP guidelines?

Accepted Answer

50 feet on each side

Answer

Most state BMP guidelines recommend a minimum 50-foot buffer on each side of perennial streams, though wider buffers are recommended on steeper slopes.

Question 4

The parameter 'biochemical oxygen demand' (BOD) in water quality testing measures:

Accepted Answer

The amount of oxygen consumed by microorganisms decomposing organic matter

Answer

BOD measures the oxygen consumed by microbial decomposition of organic matter over 5 days at 20°C, indicating the degree of organic pollution in water.

Question 5

Skid trails should be located to minimize water quality impacts by:

Accepted Answer

Following contours or at grades less than 10% with frequent water bars

Answer

Contour or low-grade skid trails with water bars prevent concentrated flow and reduce erosion by diverting runoff before it gains velocity.

(SAF) Society of American Foresters Certification Practice Test

(SAF) Society of American Foresters Certification Practice Test

SAF Water Quality & Management 3