- Sediment Control - Fiber Rolls and Coir Logs
Fiber rolls, commonly called rice straw wattles, are a very effective sediment control measure. Straw wattles are typically used in sediment control applications around jobsites, often replacing silt fence. Straw wattles are also proven effective as Slope Interruption Devices, (SID’s). Tests done at San Diego State University show that properly installed Earthsavers™ Straw Wattles provide up to 58% reduction in the loss of sediment on the test slope.
Rice straw wattles, when properly installed, reduce the rate of water flow, by absorbing water and filtering sediment. A significant amount of sediment will drop out of the water behind the wattle as it pools during a rain event. On steep slopes, wattles used in conjunction with a properly designed and installed erosion blanket results in an extremely effective BMP. Rice straw is naturally biodegradable, enhancing the soil and helping vegetation become established. The rice straw used in the Earthsavers™ straw wattles is certified weed free by the Department of Agriculture.
Earthsavers™ wattles come in a variety of sizes. The standard is 8"-8.5" diameter, with 12” and 20” nominal diameters available for more severe applications. Rice straw wattles are contained by photodegradable netting which is designed to last at least two construction seasons. Also available in a 100% biodegradable version with burlap netting for installations with environmental concerns.
Coir Logs are long knotted coir netting filled with 100% natural fresh water coir fiber. Normal density is 7 lb/cubic foot in 9” and 12” diameters. Coir logs will last three or more years on a construction site. Coir logs are widely used on stream bank, sea shores and lake shores are controlling the sand slide. It is also used in desert areas for controlling sand movement. Coir logs can be cut into sections and stacked for stream bank stabilization, fluid containment, or used separately for check structures. Aquatic plants are normally planted in the log and the root structure takes over the erosion protection job as the log biodegrades.