Virginia Erosion and Sediment Control Inspector Exam questions and verified correct answers

Erosion Impact Area - correct answer area of land NOT ASSOCIATED with a current land- disturbing activity but contributing to sedimentation How much more soil loss occurs from construction sites versus natural soil erosion rates? Agricultural land? - correct answer 1000 times more than the average natural soil erosion rate. 20 times more than agricultural land. What are 4 erosive forces? - correct answer wind water ice gravity Name and define 5 stages of soil erosion. - correct answer Raindrop- 90% of total soil erosion Sheet- the soils ability to infiltrate water is exceeded and it runs in sheet flow (about 100 ft before concentrating), how sediment gets transported Rill- when sheet flow begins to concentrate, velocity and turbulence increase, but easily repaired Gully-when rills converge, larger than rill and usually requires heavy equipment to repair Channel- large volume of water increases the gully, vertical sides are observed or for an existing streambed when structural integrity is destroyed What are the factors of rainfall impact? - correct answer Kinetic energy is dependent on rainfall amount/intensity, raindrop diameter, and raindrop velocity What are two damaging effects of rainfall impact? - correct answer Causes soil compression which reduces infiltration Mainly occurs in May-Sept which is when disturbance is most active