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CPESC EXAM NEWEST 2024 ACTUAL EXAM
COMPLETE 150 QUESTIONS AND CORRECT
DETAILED ANSWERS ( VERIFIED ANSWERS )
|ALREADY GRADED A+
What are the 5 factors that influence erosion? - ANSWER- Soil erodibility, topography, vegetative cover, season, climate (rainfall)
What influences soil erodibility? - ANSWER- Soil texture, structure and % of OM
How does vegetative cover influence erodibility? - ANSWER- Top growth reduces raindrop impact, filters sediment and slows down runoff velocity; roots hold mass particles together
How can you decrease erodibility in relation to topography? - ANSWER- Increase slope roughness
What climate characteristics affect erodibility? - ANSWER- Rainfall intensity, duration and frequency
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Why does frequent rainfall increase erodibility? - ANSWER- The soil becomes saturated and no more water can infiltrate which increases runoff volume
Why is erosion potential high in the spring if it rains? - ANSWER- Water can't infiltrate the frozen subsoil which increases runoff volume
What are some ways urban development impacts erosion hazards? - ANSWER- Changes hydrology (GW flow, drainage), disturbs large amounts of soil, removes plant cover
BMP considerations for clearing and grubbing? - ANSWER- Preserve existing vegetation; clear only what is required for immediate construction activity
BMP considerations for mass grading? - ANSWER- Create principle basins, traps, barriers, diversions and channels; temporary stabilization; manage concentrated runon and runoff (water bars)
BMP considerations for site access & off-hauling? - ANSWER- Stabilize with gravel and temporary vegetation; limit ingress and egress points
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What are the 3 stages of inlet construction? - ANSWER- Pipe installation, inlet construction, inlet backfill
BMP considerations of channel construction? - ANSWER- Monitor weather, install grade controls, stabilize streambanks early; consider time of year (weather) to start construction (phasing)
BMP considerations of final stabilization? - ANSWER- Immediately apply temp or permanent stabilization of disturbed areas; don't allow surface area to dry out for a few days before seeding (affects germination)
BMP considerations of vertical construction? - ANSWER- Protect inlets; modify plan to show new conditions and updated measures
What would have to be updated as construction progressed on the SWPPP? - ANSWER- Installation and removal dates, changes in plan designs, and changes in BMPs
When are outlet protectors used? Examples? - ANSWER- To control runoff; wattles, check dams (energy dissipaters) or thick/matted veg, riprap (ground cover)
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What is the RUSLE equation? - ANSWER- A = R K L S C P
What are the units for A in RUSLE? - ANSWER- Ton/ha/year
What kind of erosion does RUSLE cover? - ANSWER- Sheet and rill erosion only
Define soil erodibility - ANSWER- The ease with which soil is detached by splash during rainfall
Why is sediment yield different from erosion rate? - ANSWER- Sediment yield is the amount of eroded soil that is delivered to a certain point whereas erosion rate is the rate of soil wearing away from an area
What is the formula for MUSLE? - ANSWER- T=11.8(V.Qp)^0.56 K LS C P
What is V and Qp in MUSLE? - ANSWER- V = volume of storm runoff in mm3 Qp = Peak flow for storm in m3/s
How many;
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