NPDES EXAM QUESTIONS AND CORRECT ANSWERS | NEW 2026/2027 UPDATE | GRADED A+.

NPDES EXAM QUESTIONS AND CORRECT ANSWERS | NEW 2026/2027 UPDATE | GRADED A+. Erosion - ANSWER is the process by which the land surface is worn away by the action of wind, water, and gravity. Sedimentation - ANSWER is the settling out of soil particles transported by water and wind. Four process of overland erosion are? - ANSWER Splash, sheet, rill, and gully erosion. Four principle factors influencing soil erosion are? - ANSWER Soil characteristics, vegetative cover, topography, and climate. List three physical effect of erosion and sedimentation: - ANSWER Increased flooding reduced hydraulic capacity in rivers, and streams; increased maintenance of stormwater systems.; increased water treatments cost; and decreased recreational value. List three biological effect of erosion and sedimentation: - ANSWER Reduced light for aquatic plants; clogs fish gills; impairs spawning; disrupts food chain; blankets bottom, suppresses aquatic life; and disrupts ecosystem. Planning the development to fit the terrain using the particular: - ANSWER Topography; soils; drainage patterns; natural vegetation of the site; and minimize the extent of the area exposed at one time and the duration of exposure. Perimeter Control Practices - ANSWER What you apply to protect the disturbed area from off-site runoff and to protect off-site areas from sediment damage. Erosion Control Practices - ANSWER What you apply to prevent excessive onsite damage. Keep runoff velocities _____ and _______ runoff on the site - ANSWER Low and retain Soil erosion can be classified as 2 types. What are they? - ANSWER Wind and Water. What are the two sources of Soil erosion. - ANSWER Natural and Manmade Water erosion can be classified as two type of erosions. What are they? - ANSWER Overland and Stream/Channel erosion. Soils in the Type A hydrologic group have ____ infiltration rates and ____ runoff potential even when thoroughly wetted. - ANSWER high and low Soils in the Type D hydrologic group have very ____ infiltration rates and ____ runoff potential when thoroughly wetted. - ANSWER low and high What is the rainfall erosion index? - ANSWER The rainfall erosion index is the only factor in the Universal Soil Loss Equation which is beyond the developer's control. When do you stabilize disturbed areas after final grading to prevent raindrop impacts from causing erosion. - ANSWER Immediately Storage of paints, solvents, cements, pesticides, acids, or other potentially polluting chemicals is no big deal because they are only stored temporarily and get used up quickly. (True / False). - ANSWER False The public needs to understand that dust is just a normal part of construction. (True / False). - ANSWER False A temporary gravel construction entrance must extend the full width of the entrance. It must be at least ____ feet long and at least ____ inches thick. Aggregate should be ____ in. stone or FDOT No. ____ stone. Prior to installing the gravel, a ____ should be placed on the ground to simplify installation and maintenance. - ANSWER 50, 6, 2" or FDOT No.1, and geotextile Maintenance of a temporary gravel construction entrance should be performed when void spaces are full of ____ - ANSWER Sediment The maximum drainage area for a silt fence under sheet flow conditions is ____ acre per 100 feet of barrier length. - ANSWER ¼ What is the average usable life of a silt fence? - ANSWER 6 months For proper installation of a silt fence, a trench ____ inches deep and ____ inches wide must be excavated. This will allow the ____ inches of fabric to extend into the ground for backfilling and compaction. - ANSWER 4", 4", 8" What is the maximum drainage area for an inlet protection device? - ANSWER 1 acre When constructing a silt fence drop inlet sediment filter, a trench ____ inches deep and ____ inches wide must be excavated to allow ____ inches of the fabric to extend into the trench. - ANSWER 4", 4", 8" Stakes shall be __" x __" by __ feet long and a 2" x 4" frame will be constructed ________ for proper stability. - ANSWER 2", 4", 3', around the top of the stakes The purpose of a sediment trap is to (filter/detain) turbid water. - ANSWER Thank you for Purchasing this exam Study Guide. We provide high-quality academic materials to help students excel in exams. Our other Services include but not limited to: academic research, University & College assignments writing, essay writing, Online Classes, and research projects. Our services are reliable, affordable, and plagiarism-free. All the Best in your Exam. For more information; Contact us at: or 0R