Rugged polypropylene construction can be easily rinsed and reused. Deep accumulation pocket (36") can hold up to 500 lbs. of soil, sand, sediment and dirt. Designed for easy removal with a backhoe, forklift, or other equipment. Helps comply with NPDES, 40 CFR 122.26 (1999). Flow rate: 200 Gal/Min/FtÇ. Sold individually.