USACE Approved Application Projects • Levee Overtopping/Overwash • Channels • Ponds / Storage Lagoons Bank Stabilization • Dike Repair Slope Stability • Canal / River Bank Stabilization • Dam Overflow Structure Project • Shallow Plane Slope Stability Regulation (cid:216) Erosion-related pollutants cost the (cid:151) The Driving Forces: United States up to US$13 billion (cid:151) EPA – Environmental Protection Agency – annually. Via Clean Water Act (CWA) (cid:216) United States spends over US $1 (cid:151) NPDES – National Pollutant Discharge billion removing sediment from Elimination System harbors and waterways Annually. Use of Best Management Practices for (cid:151) NPDES Compliance (EPA TRM Fact Sheet) (cid:216) EPA estimates that sediment deposition in reservoirs from storm water runoff costs up US $500 million annually. (cid:216) Annual water storage replacement costs from sediment range from US$2 to US$6 billion. Vegetative Covers Are Environmentally Friendly… Enhanced Water Quality Through Filtration and Infiltration, Reduced Site Disturbance and Elimination of Thermal Pollution Property of Western Excelsior -All Rights Reserved - Do not Distribute EPA Fact Sheets Best Management Practice Examples Traditional Hard Armor Applications Rock Rip Rap Channel Concrete Slope Paved Channel Fabriform Pond Slope Stabilization USACE Concrete Block & HPTRM Channel Erosion Control Performance Levels EPA Storm Water Fact Sheet Qualifies As: Best Management Practice EPA STORM WATER FACT SHEET Turf Reinforcement Mats PERFORMANCE CRITERIA High Performance Turf Reinforcement Mats (HPTRM) Shear Stresses ≥ 10 lbs/ft, Tensile Strength ≥ 3000 lbs/ft Std Turf Reinforcement Mats (TRM) Shear Stresses ≤ 8 lbs/ft, Tensile Strength < 3000 lbs/ft Natural Vegetation Hydraulic Limits (Shear Stress) Vegetated Cover Only ≤ 2 lbs/ft Economic Cost Comparison TRMs Vs. Traditional Hard Armor Techniques $6 – $30 / sm $36 – $72 / sm $48 – $96 / sm Approximate Installation Cost are in US Dollars Source: ECTC Tensile Strength Important for 3 Reasons 1. Non – Hydraulic Stress Resistance • Resist Wheel Loadings • Heavy Mowing Activity • Construction Traffic • General Maintenance Activity • Debris Loading • Ice Flows • Animal Loading • Higher Factor of Safety 2. Design Life up to 25 or 50 Years § Higher strength based on UV degradation time allows for longer design life Property of Western Excelsior -All Rights Reserved -Do not Distribute
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