SAF Water Quality & Management 2 — Questions and Answers
Question 1: Which forestry practice is most effective at reducing peak stream flows during storm events?
- Clearcutting upslope areas
- Maintaining forested riparian buffers (Correct answer)
- Installing concrete-lined drainage ditches
- Removing large woody debris from streams
Correct answer: Maintaining forested riparian buffers
Forested riparian buffers intercept runoff, promote infiltration, and slow water movement, significantly reducing peak flows during storms.
Question 2: What is the primary function of a settling pond in forest road drainage systems?
- To store water for firefighting
- To allow suspended sediment to settle before discharge (Correct answer)
- To irrigate nearby tree plantings
- To recharge groundwater aquifers
Correct answer: To allow suspended sediment to settle before discharge
Settling ponds trap sediment from road runoff by slowing water flow and allowing particles to settle before water enters streams.
Question 3: The term 'hyporheic zone' refers to which area in a stream ecosystem?
- The deepest part of the stream channel
- The subsurface area where stream and groundwater mix (Correct answer)
- The flood-prone zone adjacent to the stream bank
- The area of maximum water velocity
Correct answer: The subsurface area where stream and groundwater mix
The hyporheic zone is the saturated subsurface region beneath and beside streams where surface water and groundwater exchange occurs.
Question 4: Best Management Practices (BMPs) for forestry are primarily designed to:
- Maximize timber harvest volume
- Prevent water quality degradation during and after forestry operations (Correct answer)
- Reduce the cost of logging operations
- Increase stream fish populations
Correct answer: Prevent water quality degradation during and after forestry operations
Forestry BMPs are site-specific practices developed to protect water quality by minimizing nonpoint source pollution from logging activities.
Question 5: Which soil texture class has the greatest potential for surface runoff and erosion?
- Sandy loam
- Silt loam
- Clay loam (Correct answer)
- Sandy clay
Correct answer: Clay loam
Clay loam soils have low permeability due to fine particles, promoting surface runoff and making them highly susceptible to erosion when disturbed.
Question 6: Under the Clean Water Act Section 404, what activity typically requires a permit in wetland areas adjacent to forest land?
- Controlled burns within 300 feet of wetlands
- Dredge or fill operations affecting wetland hydrology (Correct answer)
- Tree harvesting using low-ground-pressure equipment
- Installation of temporary stream crossings with mats
Correct answer: Dredge or fill operations affecting wetland hydrology
Section 404 of the Clean Water Act requires permits from the Army Corps of Engineers for discharge of dredged or fill material into waters of the U.S., including wetlands.
Question 7: What does a negative water balance in a watershed indicate?
- Groundwater recharge exceeds precipitation
- Evapotranspiration and streamflow exceed precipitation inputs (Correct answer)
- Stream discharge exceeds baseflow contributions
- Precipitation exceeds combined ET and streamflow outputs
Correct answer: Evapotranspiration and streamflow exceed precipitation inputs
A negative water balance means water outputs (ET + streamflow) exceed inputs (precipitation), often indicating drought conditions or groundwater depletion.
SAF Water Quality & Management 2
Which forestry practice is most effective at reducing peak stream flows during storm events?