The Search for an Appropriate Hard-Surface Sediment Control BMP
When you are faced with potential runoff on a hard-surface site, your options for sediment barriers are limited. The use of straw wattle and gravel bags has been the traditional choice. However, fiber rolls and gravel bags have limitations and may not be an appropriate selection.
Customer Feedback: Non-Traditional Solutions for Hard Surfaces
As the industry progresses and many states are starting to require effective and durable sediment control BMPs, non-traditional solutions are becoming a more popular choice for hard surfaces. Not only do these newer solutions outshine straw wattle performance, they are often significantly longer lasting. We talked to Estimator Project Manager Todd Hudson about how he approaches hard-surface sediment control on his sites, and his feelings about the straw wattle and gravel bag combination. Todd has been working with Storm Water Inspection and Maintenance Services (SWIMS) for 16 years and has vast experience choosing BMPs.
“It just kind of depends on the site and how much exposure you have. If it’s just a flat site where they’re maybe demoing a building, a lot of times [straw wattle and gravel bags] can be enough. But if there’s going to be a lot of dirt, a lot of potential for run off, then that [solution] doesn’t really work that well. We would then go to something like the Heavyweight DuraWattle™.”
The Heavyweight DuraWattle™ is a durable, lightweight, and flexible sediment barrier manufactured by WTBinc. Todd praised the product for its effectiveness and how quickly he was able to master the hard-surface install and removal process on a current tenant improvement Walmart site in Rohnert Park, CA.
“Once we got it down, it became pretty easy. We’ve gone back and moved it around several times.”
The DuraWattle™ worked well for Todd at this Walmart site because it allowed the locals to still drive through the area before it was completely fenced off. As this specific wattle is designed to be driven over, it was a great match.
DuraWattle™ as a Hard Surface Sediment Barrier
The Heavyweight DuraWattle™ solves the big problems that straw wattle and gravel bags create in hard-surface sediment control.
- The DuraWattle™ is reusable and lasts for years over multiple job sites.
- The barrier is lightweight and easy to install.
- ASTMD field tests show 96.6% sediment retention and 58% turbidity reduction.
- They are built to be driven over in heavy traffic.
Todd plans to reuse the DuraWattle™ when the Rohnert Park job is over. He regularly uses it on other jobsites with soil and sidewalk applications. Because the Heavyweight wattle is built to be driven over, the barrier is especially effective at entrances and exits of sites.
“Traditional straw wattle would be flattened out and junk within a few hours of installation on a traditional job site and the [Heavyweight DuraWattle™] will last. So, I use it frequently for entrances and exits of job sites.”
The DuraWattle™ is light and easy to move making it workers’ compensation friendly. The wattle can be shipped compressed to 1800ft. per pallet and is reusable over many sites. It’s made 100% in the USA by WTB, Inc. You can request a quote here. If you would like to review the hard surface installation process, click here.
Hard-surface application of the DuraWattle™, review by Terry Sigler with Shames Construction
Recently, we had a talk with Terry Sigler on this Walmart site in Sacramento, CA about how the DuraWattle™ performed during a big storm.
Choose Your Hard Surface Sediment Barriers Wisely
Make sure that you are selecting the appropriate BMP for your hard-surface site. In some cases, the traditional choice is not always best!
In California for example, the use of fiber rolls on hard surfaces is not recognized. In Caltrans’ BMP manuals for fiber rolls, there are no spec drawings for a hard surface application (Section 4, Fiber Rolls SC-5). The CASQA BMP Handbook lists under limitations of fiber rolls, “Fiber rolls are not effective unless trenched in and staked” (Fiber Rolls SE-5). As this is not reasonable on hard surfaces, it is easy to see the downfalls of its use. This is not to mention other listed limitations such as it’s difficulty to move while saturated, causing potential worker’s compensation situations.
Rock bag berms are also a limited choice for hard surface sediment control. They are quick to break down and can be very labor intensive. The California Stormwater BMP Handbook SE-6 (Gravel Bag Berm) states that “Gravel berms may be difficult to remove,” and “Installation may be labor intensive.” Caltrans’ Handbook (SC-6 Gravel Bag Berms) states that they have “Limited durability for long term projects.” Using a more lightweight and durable solution such as the Heavyweight DuraWattle™ could potentially save a lot on labor costs and replacements.