CES Water Quality & Watershed Management

Question 1

What is the primary federal law governing water quality in the United States?

Accepted Answer

Clean Water Act (CWA)

Answer

The Clean Water Act (1972) is the principal federal law regulating the discharge of pollutants into US waters and establishing water quality standards for surface waters.

Question 2

What is a Total Maximum Daily Load (TMDL)?

Accepted Answer

The maximum amount of a pollutant a water body can receive and still meet water quality standards

Answer

A TMDL calculates the maximum pollutant load a water body can assimilate while meeting water quality standards, allocating that capacity among point and nonpoint sources with a margin of safety.

Question 3

What is the difference between point source and nonpoint source water pollution?

Accepted Answer

Point sources discharge from identifiable locations (pipes, outfalls); nonpoint sources come from diffuse areas (runoff, atmospheric deposition)

Answer

Point sources have discrete, identifiable discharge locations (factory pipes, sewage outfalls) regulated by NPDES permits. Nonpoint sources are diffuse (agricultural runoff, urban stormwater) and are harder to regulate.

Question 4

What does BOD (Biochemical Oxygen Demand) measure in water quality assessment?

Accepted Answer

The amount of dissolved oxygen consumed by microorganisms to decompose organic matter in water

Answer

BOD measures the oxygen required by aerobic microorganisms to break down organic material in water over a specified time (usually 5 days at 20°C). High BOD indicates high organic pollution.

Question 5

What is a riparian buffer zone and why is it important for water quality?

Accepted Answer

A vegetated area along waterways that filters pollutants, stabilizes banks, and provides wildlife habitat

Answer

Riparian buffers are vegetated strips along streams and rivers that filter sediment and pollutants from runoff, stabilize streambanks, reduce erosion, moderate water temperature, and provide ecological habitat.

(CES) Certified Environmental Scientist Practice Test

(CES) Certified Environmental Scientist Practice Test

CES Water Quality & Watershed Management