NPDES LEVEL 1 A PRACTICE TEST EXAM:
NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM, 2025/2026 WITH
CORRECT/ACCURATE ANSWERS
Refers to the fundamentals certification (blue card) issued by the georgia
soil and water conservation commission (GSWCC)
NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM
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 - CORRECT-ANSWERS--C) 25
As rain falls to the earth, what is the very first function of vegetation?
A) It reduces detachment
B) It increases infiltration
C) It absorbs rain drop impact
D) Roots hold soil in place - CORRECT-ANSWERS--A) It reduces detachment
>>> Explanation
, Interception (Absorption of Impact): The initial action of vegetation is to
physically intercept the raindrops with its leaves, stems, and canopy. This
breaks the kinetic energy of the rain, preventing the direct impact that
dislodges soil particles. This process is known as interception.
Reduction of Detachment: Because the impact is absorbed, it reduces the
detachment (or erosion) of soil particles [8]. This is a result of the initial
impact absorption.
Increased Infiltration: The slowed flow of water to the ground surface
allows more time for water to soak into the soil (infiltrate), rather than
running off immediately. This is also a consequence of interception and
reduced velocity.
Roots Holding Soil: Roots stabilize the soil structure, which is a key long-
term function of vegetation in erosion control, but the immediate, first
physical action when a drop of rain hits is the absorption of that drop's
energy by the plant structure [8].
Because of the likelihood of thunderstorms which is the worst month to
schedule land disturbing activities?
A) April
B) July
C) September
D) October - CORRECT-ANSWERS--B) July
Which of the following is not a stage in Erosion and Sedimentation?
NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM, 2025/2026 WITH
CORRECT/ACCURATE ANSWERS
Refers to the fundamentals certification (blue card) issued by the georgia
soil and water conservation commission (GSWCC)
NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM
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 - CORRECT-ANSWERS--C) 25
As rain falls to the earth, what is the very first function of vegetation?
A) It reduces detachment
B) It increases infiltration
C) It absorbs rain drop impact
D) Roots hold soil in place - CORRECT-ANSWERS--A) It reduces detachment
>>> Explanation
, Interception (Absorption of Impact): The initial action of vegetation is to
physically intercept the raindrops with its leaves, stems, and canopy. This
breaks the kinetic energy of the rain, preventing the direct impact that
dislodges soil particles. This process is known as interception.
Reduction of Detachment: Because the impact is absorbed, it reduces the
detachment (or erosion) of soil particles [8]. This is a result of the initial
impact absorption.
Increased Infiltration: The slowed flow of water to the ground surface
allows more time for water to soak into the soil (infiltrate), rather than
running off immediately. This is also a consequence of interception and
reduced velocity.
Roots Holding Soil: Roots stabilize the soil structure, which is a key long-
term function of vegetation in erosion control, but the immediate, first
physical action when a drop of rain hits is the absorption of that drop's
energy by the plant structure [8].
Because of the likelihood of thunderstorms which is the worst month to
schedule land disturbing activities?
A) April
B) July
C) September
D) October - CORRECT-ANSWERS--B) July
Which of the following is not a stage in Erosion and Sedimentation?
