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Filtrexx® Check Dams (Siltsoxx™) SECTION 1: CONSTRUCTION Filtrexx® Check Dams (SiltSoxx™) PURPOSE & DESCRIPTION. 1Filtrexx® SiltSoxx™ is a 3three-dimensional tubular sediment control and stormwater runoff filtration device typically used for Check Dams, as stormwater drainage ditches and small channels on or near land disturbing activities to: • slow concentrated directional flow velocity of storm runoff, • reduce gully erosion in ditch bottoms, • remove sediment and soluble pollutants (such as phosphorus and petroleum hydrocarbons) present in stormwater runoff Check dams provide a porous physical barrier Check dams for filter cell perpendicular to concentrated stormwater flow in stormwater compared to planar constructed designed to reduce and disperse runoff energy. It sediment control devices. reduces erosion by slowing runoff velocity and • Check dams can be customized to remove target dissipating concentrated storm runoff flow. It also pollutants from stormwater, such as phosphorus traps sediment and soluble pollutants primarily by and turbidity. filtering stormwater as it passes through the matrix • Porous physical barrier of check dams reduces of the check dam and secondarily by allowing water stormwater flow velocity and disperses runoff to temporarily pond behind the check dam, allowing energy. deposition of suspended solids. • Correct spacing of check dams will reduce erosion and prevent gully formation in APPLICATION ditch/channel bed. Check dams are used in drainage ditches and small • Greater surface area contact with soil relative to channels on and around land disturbing activities planar geotextile devices used for check dams until final stabilization is complete. Check dams reduces potential for runoff to undercut the should be installed prior to excavating, filling, or device leading to unfiltered stormwater. grading of uphill areas. Check dams are only used in • No trenching is required; therefore soil is not ditch grades equal to or less than 10% (grades greater disturbed upon installation. than 10% should employ structural stabilization • Check dams can be installed year around in practices). Check dams should not be used in areas difficult soil conditions such as frozen or wet where the contributing drainage area is greater than 2 ground, and dense and compacted soils, as long as (Fifield, 2001) to 10 acres (KY TC, 2006) (0.8 ha to stakes can be driven. 4 ha), and should be placed in a manner to prevent • Check dams can be easily installed on top of sediment from entering receiving streams, rivers, rolled erosion control blankets and turf lakes, or wetlands. Check dams should never be used reinforcement mats. in ephemeral, perennial, or intermittent streams. • Check dams are easily implemented as one treatment in a greater treatment train approach to ADVANTAGES AND DISADVANTAGES a site erosion and sediment control system. Advantages • Organic matter and humus colloids in • Tubular filtration matrix allows for better trapping FilterMediaTM have the ability to bind and adsorb and removal of sediment and soluble pollutants 32 | Filtrexx® Design Manual | Version 10.0 1.3. Filtrexx® Check Dams phosphorus, metals, and hydrocarbons that may program offered through the U.S. Green Building be present in stormwater runoff. Council. LEED credits are determined on a per SECTION 1: CONSTRUCTION • Microorganisms in compost FilterMedia™ have project basis by an independent auditing committee. the ability to degrade organic pollutants and cycle Filtrexx neither guarantees nor assures LEED credits captured nutrients in stormwater runoff. from the use of its products. LEED is a trademark of • Soxx (mesh netting containment system) allows the U.S. Green Building Council. check dams to be placed in areas of concentrated flow. Disadvantages • Check dams can be direct seeded at time of • If filler material of check dams is not Filtrexx® application to provide greater stability and CertifiedSM FilterMedia, hydraulic flow rate and/ pollutant filtration capability once vegetation has or sediment and pollutant removal performance established. may be diminished. • FilterMedia is organic and can be left on site • If not installed correctly, maintained or soil after permanent stabilization is complete, used used for a purpose or intention that does not meet in landscape design, and/or seeded and planted specifications, performance may be diminished. with permanent vegetation. • If land surface is extremely bumpy, rocky, or • FilterMedia improves existing soil structure changes elevation abruptly, ground surface contact if spread out and used as a soil amendment after to check dam may be diminished thereby construction activity is complete. adversely effecting performance. • Biodegradable check dams can be left on site • If stormwater flow breaches check dam after construction activity is complete and may sediment retention will be diminished. eliminate the need and cost for removal, labor and • Check dams should never be the only form disposal. of site erosion/sediment control. • Check dams are available in 8 in (200mm), • No ditch checks should be used in drainage areas 12 in (300mm), 18 in (450mm), 24in that exceed 10 acres (4 ha). (600mm), and 32 in (800mm) diameters • No ditch checks should be used in drainage for a variety of flow conditions and/or customized ditches/channels that exceed a 10% slope. applications. ® • Check dams should not be placed in • Check dams may assist in qualification for LEED ephemeral, perennial, or intermittent streams. Green Building Rating and Certification credits under LEED Building Design & Construction MATERIAL SPECIFICATIONS (BD+C), New Construction v4. Awarded credits Check dams use only Soxx photodegradable or may be possible from the categories of Sustainable biodegradable netting materials available from Sites, Water Efficiency, Materials & Resources, Filtrexx International and are the only mesh materials and Innovation. Note: LEED is an independent accepted in creating check dams for any application. For Soxx Material Specifications see Table 3.1. ADVANTAGES FILTERMEDIA™ CHARACTERISTICS S LOW MED HIGH Check dams use only Filtrexx Certified FilterMedia which is a coarse composted material that is Installation Difficulty specifically designed for removal of solids and soluble ü pollutants from stormwater runoff. FilterMedia can Durability be altered or customized to target specific pollutants ü in runoff as approved by the Engineer or Filtrexx Sediment Control International. All Filtrexx Certified FilterMedia ü has been third party tested and certified to meet minimum performance criteria defined by Filtrexx Soluble Pollutant Control ü International. Performance parameters include hydraulic flow through rate, total solids removal Runoff Flow Control efficiency, total suspended solids removal efficiency, ü turbidity reduction, nutrient removal efficiency, Life Cycle Cost ü metals removal efficiency, and motor oil removal Construction Activities | Section 1: Sediment & Erosion Control | 33 efficiency. For information Planning: on the physical and chemical Check dam application using check dams should properties of Certified not be considered as the primary/only means of FilterMedia refer to the sediment control and should be used within an Filtrexx Design Manual, overall integrated Erosion and Sediment Control Section 5.1. Look for the or StormWater Pollution Prevention Plan. Check Filtrexx Certified FilterMedia dams should be considered one of the last treatments Seal from our international network of Filtrexx in a ‘treatment train system’ before stormwater is Certified Installers and Manufacturers. discharged from a site or to a receiving water or wetland. PERFORMANCE Preconstruction meetings should be conducted Performance testing and research on sediment control to educate construction site personnel about the has been extensive. For a summary of performance tools/practices used and acceptable traffic patterns testing, research results, and design specifications see that avoid running over check dams with heavy Table 3.2. For copies of publications, full reports, equipment. or Tech Link summaries visit www.filtrexx.com Successful bidders will furnish adequate research Device Function: support showing their manufactured product Check dams are a porous physical barrier that is meets or exceeds performance and design criteria specifically designed to slow stormwater flow outlined in this standard specification. Research or velocity without completely stopping, or ponding performance testing will be accepted if it meets the water. This reduces the propensity for flooding following criteria: conducted by a neutral third party, and runoff undercutting the device. Check dams utilizes standard test methods reported by ASTM also remove sediment and soluble pollutants from or referenced in a peer reviewed scientific journal, stormwater. The sediment and pollutant removal product and control treatments are tested in triplicate, process characteristic to check dams combines both performance results are reported for product and filtering and deposition of solids from ponding. control (control should be a bare soil under the same This is different than methods that rely solely on set of environmental and experimental conditions), ponding for deposition of solids for sediment control. results are peer reviewed, results indicate a minimum Ponding occurs when water flowing to the check 60% TSS removal efficiency and a minimum dam accumulates faster than the hydraulic flow hydraulic flow through rate of 5 gpm/ft2. Bidders through
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