B.S.F. or B.Sc.F. Bachelor of Science in Forestry Forest Hydrology and Watershed Management 1 — Questions and Answers
Question 1: What is 'interception' in forest hydrology?
- Water that moves laterally through the soil
- Precipitation captured by the forest canopy before reaching the ground (Correct answer)
- Groundwater recharge from snowmelt
- Evaporation from streams
Correct answer: Precipitation captured by the forest canopy before reaching the ground
Canopy interception is the portion of precipitation retained on leaves and branches that evaporates back to the atmosphere without reaching the forest floor.
Question 2: Which process describes water moving downslope through the soil above an impermeable layer?
- Infiltration
- Overland flow
- Lateral flow (throughflow) (Correct answer)
- Percolation
Correct answer: Lateral flow (throughflow)
Lateral flow (throughflow) occurs when water moves horizontally through the soil profile, often above a confining layer, and can contribute to streamflow.
Question 3: The 'paired watershed' experimental design in forest hydrology is used to:
- Compare two different tree species yields
- Isolate the effect of forest treatments on streamflow by calibrating two similar watersheds (Correct answer)
- Measure precipitation across two elevation zones
- Compare soil carbon in two forest types
Correct answer: Isolate the effect of forest treatments on streamflow by calibrating two similar watersheds
Paired watershed studies calibrate two hydrologically similar catchments, treat one, and attribute streamflow differences to the treatment.
Question 4: Riparian buffer zones along streams are maintained primarily to:
- Increase timber yield near water
- Protect water quality and aquatic habitat by filtering runoff and stabilizing banks (Correct answer)
- Reduce wildfire risk along waterways
- Provide recreational access corridors
Correct answer: Protect water quality and aquatic habitat by filtering runoff and stabilizing banks
Riparian buffers intercept sediment, nutrients, and pollutants before they enter streams, while also providing shade and bank stability.
Question 5: Which hydrologic term describes the maximum rate at which soil can absorb water?
- Evapotranspiration
- Field capacity
- Infiltration capacity (Correct answer)
- Wilting point
Correct answer: Infiltration capacity
Infiltration capacity is the maximum rate at which a soil can absorb incoming water; when rainfall exceeds this rate, Hortonian overland flow occurs.
Question 6: In the context of US forest policy, the Clean Water Act (1972) is relevant to forestry because it:
- Banned all timber harvesting within 500 feet of streams
- Regulates discharge of pollutants and requires states to manage nonpoint source pollution including forestry runoff (Correct answer)
- Mandates riparian buffer widths of at least 100 feet
- Established the National Forest system
Correct answer: Regulates discharge of pollutants and requires states to manage nonpoint source pollution including forestry runoff
The Clean Water Act sets standards for water quality and requires states to address nonpoint sources like logging roads and harvest areas that can degrade streams.
B.S.F. or B.Sc.F. Bachelor of Science in Forestry Forest Hydrology and Watershed Management 1
What is 'interception' in forest hydrology?