When it comes to Sediment and Erosion control Best Management Practices (or “BMPs”) two of the most commonly used in the state of Arizona would be straw wattle and silt fence. Straw wattle can come in various sizes (including 9”, 12”, 20”), and silt fence comes in economy and wire backed, with wire backed being the predominantly used version. When utilizing either of these products there are certain specifications to follow. With every project differing, the demands for controls will differ. It is important to consult a knowledgeable consultant and engineer to ensure your project adheres to the state, municipal and site-specific needs. When these controls are installed it is important that they are installed according to the manufactures' specifications. If either of these control measures are installed the easy but wrong way, they can cause more damage and lead to significant costs in repairs. 

What are the intended uses of straw wattle? Straw wattle can be used to reduce soil erosion, sediment control, slow the velocity of water in high flow areas, and is environmentally safe. Some of the advantages are cost, availability, ease of installation and environmental safety. They are installed on slopes, perimeters, ditches, swales as well as many other uses. Some of the disadvantages are that they are easily movable, vehicles will drive over them, and they do not provide the same amount of ponding as silt fence. It is important to remember the BMP specifications; proper installation of straw wattle can reduce storm water velocity to help control the rate of soil erosion and control sediment on site.

What are the intended uses of silt fence? In Arizona, silt fence is most commonly used as a perimeter control measure. That may be a site perimeter or a lot perimeter control. Silt fence can help with sediment displacement and is probably the most popular sediment control measure. A common misuse of silt fence is when people attempt to use it as an erosion control measure. It is best used to protect water ways such as washes, streams, rivers and lakes from loose soil and debris that could potentially leave a project during a stormwater event. It is important to remember to follow the BMP specification guide for proper installation to establish the best use and desired outcome.

Remember that every construction project is different! Consulting with Earthworks as a compliance management company will greatly help in proper installation and uses to prevent erosion and potential storm water pollution on your construction projects.