NGICP EXAM QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026

NGICP EXAM QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026 o The process where trees and vegetation pull moisture out of the soil through their roots and convey it to their leaves where it is released as water vapor is referred to as what? Evapotranspiration Precipitation Water Storage Infiltration - Answers Evapotranspiration What are the possible impacts of sediment erosion upstream? - Answers Flooding Stream bank erosion Sediment clogged lakes Pollutants in drinking water The "what is a watershed" video mentioned many ways to prevent stormwater runoff. Which of these ways is categorized as a green infrastructure practice? Planting grasses Tiling land less Being careful of the amount of fertilizer used Using rain gardens - Answers The correct response is using raingardens. The other options can be used to prevent stormwater runoff, but are not categorized as a green infrastructure practice. Instead, they could be used independently or along with green infrastructure practices. What is stormwater? o A box-like structure or pit beneath a storm sewer inlet used to collect surface water drainage or runoff o Underground layers of porous rock saturated with water o Water that moves over or sits on top of the ground such as creeks streams rivers lakes wetlands and oceans o Water originating from rainfall or melting snow that runs off across the land instead of infiltrating in to the ground. - Answers o Water originating from rainfall or melting snow that runs off across the land instead of infiltrating in to the ground. Which of the following describe how stormwater runoff impacts the environment? Choose 3. o Pollutant runoff into waterways o Improved water quality o Land and streambank erosion o Benefit to wildlife habitats o Potential Flooding - Answers o Pollutant runoff into waterways o Land and streambank erosion o Potential Flooding Which of the following describe why it is important to manage stormwater runoff? Choose 3 o Meet CWA requirements o Ensure public safety o Increase the amount of development o Protect fish and other aquatic life - Answers o Meet CWA requirements o Ensure public safety o Protect fish and other aquatic life Which of the following describes Grey Infrastructure o An area of land within which water from rain or snowmelt drains into a single body of water. o Constructed structures such as treatment facilities sewer systems stormwater systems or storage basins. o Stormwater management practices that protect, restore or mimic the natural water cycle. o Surfaces where rain or melting snow and ice can pass through the surface into the solid of sub-base below. - Answers o Constructed structures such as treatment facilities sewer systems stormwater systems or storage basins. A new housing development is being constructed nearby. The stormwater runoff on the site is being collected and conveyed via pipes and pumps. Which of these describes the method being used to manage stormwater runoff? o Grey infrastructure o Non-Native Vegetation o Green infrastructure o Rainwater harvesting - Answers o Grey infrastructure Which of the following describes benefits of green infrastructure? o Water quality treatment o Flow control o Habitat o Aesthetics o Cooling (reducing heat island effect) o All of the above - Answers o All of the above • Which of the following are green infrastructure practices? Choose 3. o Storm drain o Ponds o Rain Barrel o Rain Garden o Green roof - Answers o Rain Barrel o Rain Garden o Green roof • Which of the following describes the difference between "Detention" and "retention"? Choose 2. o Detention is the process of managing stormwater runoff or sewer flows through a temporary holding and controlled release. o Retention is the process of continuously holding, storying stormwater until it evaporates, infiltrates or is used by vegetation. o Retention is the process of managing stormwater runoff or sewer flows through a temporary holding and controlled release o Detention is the process of continuously holding or storing stormwater until it evaporates infiltrates or is used by vegetation. - Answers o Detention is the process of managing stormwater runoff or sewer flows through a temporary holding and controlled release. o Retention is the process of continuously holding, storing stormwater until it evaporates, infiltrates or is used by vegetation. • Which of the following describes a watershed o An approach to stormwater management that protects restores or mimics the natural water cycle o The natural continuous process where water falls from the sky as precipitation infiltrates or runs off the land surface and returns to the sky through evaporation or transpiration o An area of land that drains all the rainfall and streams to a common outlet such as the outflow of a reservoir mouth of a bay or any point along a stream channel. - Answers o An area of land that drains all the rainfall and streams to a common outlet such as the outflow of a reservoir mouth of a bay or any point along a stream channel. o Use the soil triangle below, which of the following soil types is 30% sand, 30% clay and 40 % silt? Sandy loam Sandy clay loam Clay loam Sandy clay - Answers Clay loam o Use the soil triangle below, and the video, which of the following is true of the soil type that is 70% clay, 20% silt and 10% sand choose 2. Slowest to absorb water Holds its shape when wet When picked up has a flower or powered feel Make up of large granules - Answers Slowest to absorb water Holds its shape when wet o As mentioned in the Types of soil video which of the following abilities make soil valuable? Absorbing and retaining water Providing nutrients Anchoring plants Providing a home to many forms of life All of the above - Answers All of the above o As mentioned in the Types of soil video which of the following is referenced as the Ideal mix for planting? Silt Loam Sand Clay - Answers Loam o The subgrade of a bioretention facility needs to be compacted to support healthy growth of vegetation? True False - Answers False Which of the following defines "infiltration"?Choose 2. o Occurs when precipitation falls on pervious areas and soaks down through the soil layer and eventually recharges groundwater o Occurs when precipitation falls on impervious surfaces and flows to nearby surface waterways. o Refers to surfaces that do not allow water to pass through the material, such as paved roadways, concrete sidewalks, rooftops, etc. o Occurs when precipitation falls on pervious areas and soaks down through the soil layer and eventually recharges groundwater - Answers o Occurs when precipitation falls on pervious areas and soaks down through the soil layer and eventually recharges groundwater o Occurs when precipitation falls on pervious areas and soaks down through the soil layer and eventually recharges groundwater Which of the following describes topsoil? o A layer of material placed over bare soil, usually made up of partially composted organic materials such as shredded hardwood, tree bark or leaves o Sturdy construction and landscaping aggregate that is commonly used under building pads, bases, driveways, etc. o A geosynthetic material (often plastic strands or strips joined in a grid) used to reinforce soils and aggregates o The Nutrient rich layer that provides a growing media for vegetation, overall soil structure, and regulation of moisture content. - Answers o The Nutrient rich layer that provides a growing media for vegetation, overall soil structure, and regulation of moisture content. Which of the following describes compost? o A mixture of rock types that is used for armoring shoreline, controlling erosion, forming check dams, etc. o Created from the controlled biological decomposition of organic waste and adds active biological material to media mix. o Sturdy construction and landscaping aggregate that is commonly used under building pads, bases, driveways etc. o A thin sheet of synthetic material that does not allow water to pass through it. - Answers o Created from the controlled biological decomposition of organic waste and adds active biological material to media mix. What is the difference between clean material and material with fines? o Clean material has been washed and material with fines has not be washed. o Material with fines has been washed and clean material has not be washed. o Clean material is also referred to as Non-uniform o Clean material is also referred to as uniform - Answers o Clean material has been washed and material with fines has not be washed. o Clean material is also referred to as uniform What is the difference between inorganic and organic material Choose 2 o Inorganic materials do contain carbon and are derived from living matter o Organic materials do not contain carbon and are not derived from living matter o Inorganic materials do not contain carbon and are not derived from living matter o Organic materials do contain carbon and are derived from living matter - Answers o Inorganic materials do not contain carbon and are not derived from living matter o Organic materials do contain carbon and are derived from living matter Which of the following describes the value of organic matter in GI practices? o Improves soil physical properties including drainage and pore space for water storage o Supports plan growth in vegetation facilities (Rain garden) o Improves pollutant capture for some pollutants (metals and hydrocarbons) o All of the above - Answers o All of the above Which of the following describes the importance of compaction as related to construction? Choose all the apply o None o Compaction can be deep (2-3feet) with heavy equipment on wet soils o Preventing over-compaction is a primary concern for construction and maintenance on infiltration GI practices o Usually measured in the field with a nuclear density gauge or observations of a geotechnical engineer. - Answers o Compaction can be deep (2-3feet) with heavy equipment on wet soils o Preventing over-compaction is a primary concern for construction and maintenance on infiltration GI practices o Usually measured in the field with a nuclear density gauge or observations of a geotechnical engineer. Which of the following describe a type of material used in landscape construction? Choose all that apply o Sand o Compost o Mulch o Rip Rap o Crush run - Answers o Sand o Compost o Mulch o Rip Rap o Crush run o Which of the following describe how trees reduce stormwater flow? Transpiration of soil moisture Reduction of wildlife traffic Interception of precipitation Increase in output of air pollutant Evaporation of precipitation - Answers Transpiration of soil moisture Interception of precipitation Evaporation of precipitation o Which of the following concepts is incorrect? Establish plants by having a planned watering and weeding schedule as well as mulch requirements for at least the first 5 years Vegetation is considered established once its root system is well-developed and a plant is able to adapt to normal climate conditions. Established vegetation should require minimal maintenance. - Answers Establish plants by having a planned watering and weeding schedule as well as mulch requirements for at least the first 5 years o Which of the following describe a benefit of vegetation to the natural environment choose 3 Enhanced wildlife segmentation Improved air quality Reduced heat -island effect Reduced storm water flow Increased energy consumption - Answers Improved air quality Reduced heat -island effect Reduced storm water flow o Which of the following GI practices involve vegetation choose 3 Rain barrel Rain garden Blue roof Green roof Bioswale - Answers Rain garden Green roof Bioswale o Which of the following describe ways to protect a tree during construction Follow the tree protection plan for the project