In order to control erosion on a construction site, you must first understand the erosion process. Rainfall and the surface runoff of rainfall produces four main types of erosion on a construction site: Splash Erosion occurs when the raindrop impacts the bare soil surface and dislodges soil particles. Sheet Erosion occurs either after the surface of the soil is saturated or the rainfall exceeds the infiltration rate of the soil. Then the soil detached by splash erosion and the additional soil particles detached by runoff/overland flow move downslope. (Note: Splash and Sheet are sometimes referred to as Interrill Erosion ) Rill Erosion occurs when the sheet flow concentrates and causes small rills (about 1 inch deep) further eroding the soil surface. Gully Erosion occurs when runoff water in a rill detaches more soil and deepens and/or widens the channel to a significant size. (Note: There is no universally recognized dep...
Here’s another factoid from our “Let’s Look at Sediment” brochure: Sediment carries pathogens, nutrients, and toxic materials such as heavy metals and chemicals into our waterways. These pollutants affect drinking water and surface water quality, contribute to increased water treatment costs, fish consumption advisories, and expand oxygen depleted “anoxic zones” commonly called “dead zones” in the Gulf of Mexico. Perry L Oakes, PE Program Coordinator AL Erosion and Sediment Control Program
A reminder that when the soil is covered, erosion is prevented. GREEN IS GOOD. Keep vegetation if it doesn’t have to be cleared and create vegetative cover at every opportunity on a construction site. ______________________________________ Have you registered for Clear Water Alabama? https://alabamasoilandwater.gov/alesc-clearwater/ Perry L Oakes, PE Program Coordinator AL Erosion and Sediment Control Program
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