 Process of where soil particles are displaced  Wind Erosion

 Wind erosion occurs when soil particles are moved by the mass of air. Erosion

 Wind erosion transports particles in 3 ways  Surface Creep – particles are rolling and sliding Diameter in excess of 1,000µm (0.04in) Can be 5% - 20% of total soil loss from construction site  Saltation – particles are hopping and bouncing Diameter from 80µm to 1,000µm (0.003in to 0.04in) Can represent 50% - 80% of total loss by wind  Suspension – where very small particles are carried great distances by wind Diameter smaller than 80µm (0.003) Can represent less than 10% of total soil loss  NOTE: the vast majority of erosion from wind occurs with-in 2-3ft above the ground. Erosion

 Process of where soil particles are displaced  Water Erosion

 Water erodes in various methods  As water flows downhill the volume and velocity increase and therefore erosion increases. Erosion

 Raindrop – The dislodging of particles by the impact of raindrops Erosion

 Sheet Erosion – Surface flows cause shallow stripping of soil Erosion

 Rill Erosion – Very small channels up to 3” deep Erosion

 Gully Erosion – Caused by scouring causes vertical sided channels Erosion

 Stream Bank and Channel Erosion – Increased flows cut deeper and wider Erosion

 Soil Erodibility (from most to least)  Silt (most easily dislodges)  Silt Loam  Loam  Sandy Loam  Silty Clay Loam  Clay Loam  Loamy Sand  Silty Clay  Sandy Clay Loam  Sand  Sandy Clay  Clay Erosion

 Sediment - eroded material suspended in water or air  Sedimentation – the deposition of eroded material Sedimentation

 When determining BMPs, remember what you are trying to achieve or control:  Stop erosion  Control Sediment Erosion and Sediment Control