NPDES Level 1A Practice Test 2025/2026 –
100+ Questions on BMPs, Soil Erosion,
Sediment Control, Permit Rules &
Georgia State Compliance
1. A slope gradient of 25% (4:1) would indicate that in a horizontal length of
100 feet, the vertical rise would be feet.
A) 2.5
B) 12.5
C) 25
D) 4
Answer C) 25
2. As rain falls to the earth, what is the very first function of vegetation?
A) It reduces detachment
B) It increases infiltration
mailto:https://www.stuvia.com/user/Wisdoms
, C) It absorbs rain drop impact
D) Roots hold soil in place
Answer A) It reduces detachment
3. Because of the likelihood of thunderstorms which is the worst month to
schedule land disturbing activities?
A) April
B) July
C) September
D) October Answer B) July
4. Which of the following is not a stage in Erosion and Sedimentation?
A) Detachment
B) Solubility
C) Transport
D) Deposition
Answer B) Solubility
5. At what depth must sediment be removed from a silt fence barrier?
A) 12 Inches
B) 16 Inches
C) 1/4 full
D) 1/2 full
mailto:https://www.stuvia.com/user/Wisdoms
100+ Questions on BMPs, Soil Erosion,
Sediment Control, Permit Rules &
Georgia State Compliance
1. A slope gradient of 25% (4:1) would indicate that in a horizontal length of
100 feet, the vertical rise would be feet.
A) 2.5
B) 12.5
C) 25
D) 4
Answer C) 25
2. As rain falls to the earth, what is the very first function of vegetation?
A) It reduces detachment
B) It increases infiltration
mailto:https://www.stuvia.com/user/Wisdoms
, C) It absorbs rain drop impact
D) Roots hold soil in place
Answer A) It reduces detachment
3. Because of the likelihood of thunderstorms which is the worst month to
schedule land disturbing activities?
A) April
B) July
C) September
D) October Answer B) July
4. Which of the following is not a stage in Erosion and Sedimentation?
A) Detachment
B) Solubility
C) Transport
D) Deposition
Answer B) Solubility
5. At what depth must sediment be removed from a silt fence barrier?
A) 12 Inches
B) 16 Inches
C) 1/4 full
D) 1/2 full
mailto:https://www.stuvia.com/user/Wisdoms
