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Construction Activities | Section 1: Erosion & Sediment Control | 345

SWPPP Cut Sheet:

Runoff & Erosion Control Technology

PURPOSE & DESCRIPTION

Filtrexx ® Runoff diversion is a three-dimensional tubular runoff and erosion control device used for

diversion or redirection of runoff otherwise fowing to disturbed or highly erodable areas on and around construction activities. Filtrexx ® Runoff diversion can be used as temporary or permanent runoff diversion devices used to prevent soil erosion during excavation, or prior to erosion control practice installation, vegetation establishment, or fnal stabilization.

APPLICATION

Filtrexx ® Runoff diversion is generally used upslope of areas undergoing excavation. Runoff diversion is effective at diverting sheet fow runoff coming from stabilized areas and otherwise fowing to unstable or bare soils while excavation and grading is in progress. Runoff diversion should direct runoff fows to stabilized channels, heavily vegetated areas, on to fat surfaces, infltration zones, collection ponds, or storm inlets. Runoff diversion can also be used for temporary diversion on paved surfaces to protect disturbed soils adjacent to paved areas. Where hill slopes are greater than 5%, hydraulic shear stress is greater than 3 lbs/ft 2 (15 kg/m 2 ), or runoff velocity is greater than 6 CFS (0.17 CMS) additional erosion control measures to help stabilize the area where fow is being directed and potentially concentrated or channeled should be utilized. Filtrexx ® Channel protection may be used to stabilize channels where runoff is conveyed or concentrated. Runoff diversion devices and practices should be utilized early in the soil disturbance and construction process. Appropriate applications for runoff diversion devices

Filtrexx ® Runoff Diversion

include:

• diversion of runoff away from disturbed areas and to stabilized outlets or storm inlets,

• diversion of sediment-laden water to a sediment containment or storm water treatment system, • diversion of runoff into a conveyance channel to improve site working conditions (but does not otherwise increase erosion),

• prevention of sediment-laden runoff or storm water from leaving site perimeter.

For temporary applications Runoff diversion does not need to be seeded; however, for permanent runoff diversion the device should be direct seeded at the time of application, as vegetation will prevent UV degradation of the device. Runoff diversion may also be used in sensitive environmental areas, where migration of wildlife may be impeded by the use of fences or trenching may damage plant roots.

INSTALLATION

1. Runoff diversion used for runoff and erosion control shall meet Filtrexx ® FilterSoxx tm Material Specifcations and use Filtrexx ® GrowingMedia tm . Soil and/or sand may be added to the Filtrexx ® GrowingMedia tm at percent determined by the Engineer.

2. Contractor is required to be a Filtrexx ® Certifed tm Installer as determined by Filtrexx ® International, LLC (440-926-2607 or visit website at Filtrexx.com). Certifcation shall be considered current if appropriate identifcation is shown during time of bid or at time of application (current list can be found at www.fltrexx.com).

Section 1: Erosion & Sediment Control – Construction Activities