Material
Specification 807—Manufactured Ditch Check
1. SCOPE
This specification covers the types of material used in various manufactured ditch check products and associated installation materials.
2. URETHANE FOAM GEOTEXTILES
This product consists of an inner core of urethane foam with an outer lining of geotextile fabric, with aprons of geotextile fabric extending away from the foam core for two to three feet. The urethane foam core shall be affixed to the soil with U-shaped wire staples (No.11 gauge wire and at least 6-8 inches long).
Center height 10"
Base Width 20"
Section Length 7'
Geotextile Fabric Properties Test Method Value(md/cd) Grab Tensile Strength ASTM D-4623 180/105 lbs Grab Elongation ASTM D-4623 20/15% Trapezoidal Tear ASTM D-4533 85/75 lbs Puncture ASTM D-4833 70 lbs Mullen Burst ASTM D-3786 325 psi Permittivity ASTM D-4491 0.25 sec-1 A.O.S. ASTM D-4751 40 US Sieve UV Resistance (500hr) ASTM D-4355 80+%
Urethane Foam Properties Test Method Value Color Varies Density ASTM D-3574-95 1.00± 0.1lbs/ft3 or greater Indent. Force Deflection At 25% deflection ASTM D-3574-95 (4" specimen) 30± 3 lbs/50in2 Tensile Strength ASTM D-3574-95 10 psi min. Elongation ASTM D-3574-95 125% min. Tear Resistance ASTM D-3574-95 1.25lb/in Comp. Set at 50% Comp ASTM D-3574-95 10% max
3. ROLLED EROSION CONTROL PRODUCTS
Rolled erosion control products consist primarily of totally encased straw or excelsior. Straw wattles shall be manufactured from certified weed seed free agricultural straw. Sediment logs shall be manufactured of aspen, a naturally weed free product.
Wattle Properties
Nominal Diameter 9.0 Inch 12.0 Inch 20.0 Inch Minimum Diameter 8.5 Inch 11.5 Inch 19.0 Inch Length (±10%) 25.0 Ft 10.0 Ft 10.0 Ft Weight* (±10%) 50.0 lb 30.0 lb 60.0 lb Density* (±10%) 4.53 lb/ft3 3.82 lb/ft3 2.75 lb/ft3 *Weight is based on a dry fiber weight basis at time of manufacture. Baseline moisture content of straw is 15%.
Excelsior Properties
Nominal Diameter 6.0 Inch 9.0 Inch 12.0 Inch 20.0 Inch Minimum Diameter 5.5 Inch 8.0 Inch 11.0 Inch 18.0 Inch Length (±10%) 25.0 Ft 25.0 Ft 10.0 Ft 10.0 Ft Weight* (±10%) 12.0 lb 25.0 lb 20.0 lb 30.0 lb Density* (±10%) 2.44 lb/ft3 2.26 lb/ft3 2.54 lb/ft3 1.38lb/ft3 *Weight is based on a dry fiber weight basis at time of manufacture. Baseline moisture content of Great Lakes Aspen excelsior is 22%.
Straw/Excelsior Design Values1
Material Diameter Density*(lb/ft3) GPM/ft2** GPM/linear ft of installed product P Factor**(event based) %Soil
Retained6' Sediment Log 2.4 42.5 19.5 0.461 53.9 9" Wattle 4.5 7.5 5.6 0.676 32.4 9" Sediment Log 2.3 42.5 29.0 0.461 53.9
12" Wattle3.8 8.0 8.0 0.828 17.2 12" Sediment Log 2.5 40.0 36.7 0.297 70.3 20" Sediment Log 1.4 37.5 46.9 0.297 70.3 1 Values from American Excelsior Company specifications for excelsior and straw products.
*Weight is based on a dry fiber weight basis at time of manufacture. Baseline moisture content of Great Lakes Aspen Excelsior and straw fibers are 22% and 15%, respectively
** Based on ASTM D5141
4. PLASTIC PERMEABLE CHECKS
Standard plastic permeable checks are constructed of durable UV stabilized HDPE plastic. Degradable versions include an additive to promote biodegration over an 18 to 24-month period, dependent upon environmental conditions. Either version will require use of erosion control blankets to help prevent undermining of the check dams and encourage vegetation growth. 10 inch spiral spikes shall be used to anchor the product to the ground.
Erosion control blanket grade is based upon channel geometry and flow conditions. Follow manufacturers recommended installation procedures or IUM-514PC, whichever is more stringent. Staples should be a minimum of 6 inches in length and placed at intervals of 1.67 feet.
Plastic Permeable Check Properties
Material Color Porosity Length (ft) Height (ft) Weight (lb/ft) High Density Polyethylene (HDPE) with UV Inhibitor Black 35-40 3.28 0.738 2.1/3.28 High Density Polyethylene (HDPE) with
UV Inhibitor & Biodegration AdditiveTan 35-40 3.28 0.738 2.1/3.28
5. SYNTHETIC POROUS RUNOFF CONTROL STRUCTURES
Synthetic porous runoff control structures consist of two panels held together by pins and secured to the soil with pins. Number of panels used for an individual check depends upon the geometry of the channel. This practice also incorporates the use of an erosion control blanket, either as a channel liner or at individual check locations. Erosion control blankets shall be installed per manufacturer's specifications or the IUM XXX, whichever is more stringent
Porous Panel Properties
MaterialUV Resistant High Density Polyethylene (HDPE) Size 10" high x 43" long with a 2" lip Single Rib Thickness Top: 5⁄32" Bottom5/32" Distance Between Ribs Top: ½" Bottom: ½" Apparent Opening Size US Sieve No. 4 (Average Value) Percent Open Area 30% (Average Value) Weight 3.7 lb/yd2 Tensile Strength MD =1,800 lb/ft TD = 1,500 lb/ft Velocity Reduction 10% to 74% Kinetic Energy Reduction 40% to 85% Pin Properties
Long Regular Duty Standard Heavy Duty Short Heavy Duty Size 4"x27" 4"x21" 4"x16" Product Deformed D 3.5 Rod Deformed D 4.5 Rod Cold Rolled Steel Diameter 0.211" 0.240" 0.312" Tensile Strength 8000 psi 8000 psi 8000 psi Grade C1008 C1008 C1008 Point Type Blunt Sharp Sharp Pin Driver Properties
Reinforced Welded Steel Construction
Strip Erosion Matting Properties
Grab Tensile (dry) Warp: 900lb/ft, Fill: 220 lb/ft
6. VEGETATED DITCH CHECKSVegetated ditch checks are modular in form consisting of rolled product filled with a native pellet mixture and is available in three styles.
1. Simple hooded multi-check without a check flap or cape.
2. Hooded muti-check with a check flap.
3. Hooded multi-check with a check flap and cape.The cape is installed towards downstream flow side. The check flap covers the joint between individual multi-check units.