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US 8,465,231 B2Granted
Graduated silt fence
OwnerHunt Lee Christopherinventor
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OwnerHunt Lee Christopherinventor
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An geotextile silt fence has an increasing permittivity with increase in height thereby allowing larger storm events to flow through the fence without overtopping. A stiffening device is provided at the top of the silt fence to reduce sagging and improper overtopping. This stiffening device may be a mono-directional extruded geogrid structure that is a higher mil thickness than the geotextile monofilament structure of the silt fence and which is affixed to the geotextile continuously throughout the silt fence length. An overflow preferential pathway may be provided at the top of the silt fence through large voids within the geogrid providing controlled overflow of impounded water which mitigates structural failure of the silt by eliminating the typical overtopping failure mechanism.
A graduated silt fence comprising a woven geotextile fabric that includes a cross-plane permeability coefficient defining a permittivity which is increasing from one width edge and to the opposite width edge of the geotextile fabric, wherein the change in the permittivity is accomplished by a variation in weaving pattern, and wherein the variation in the permittivity throughout the geotextile width remains constant throughout the geotextile length, whereby when installed, the graduated silt fence provides a low permittivity for lower portions of the fence and as height increases, the geotextile fabric contains a greater permittivity created by change in material weave providing the greater permittivity within the textile structure allowing an increase in flow rate through the fence, wherein the variation in weaving pattern includes the use of a plain weave, adjacent a twill weave section, adiacent a satin weave section and further including a support geogrid formed of a mono-directional extruded material that is attached to the top of geotextile fabric and is of a greater material thickness and stiffness than the woven geotextile and is formed as a continuous strand of hollow rectangular structure along the top length of the woven geotextile, and wherein the geogrid is slotted to provide an overflow preferential pathway at the upper portion of the installed silt fence through the geogrid.
A graduated silt fence comprising a woven geotextile fabric that includes a cross-plane permeability coefficient defining a permittivity which is increasing from one width edge and to the opposite width edge of the geotextile fabric, wherein the change in the permittivity is accomplished by a variation in change in warp strain deformation resistance of the geotextile fabric, and wherein the variation in the permittivity throughout the geotextile width remains constant throughout the geotextile length, whereby when installed, the graduated silt fence provides a low permittivity for lower portions of the fence and as height increases, the geotextile fabric contains a greater permittivity created by change in warp strain deformation resistance of the geotextile fabric providing the greater permittivity within the textile structure allowing an increase in flow rate through the fence, and further including a support geogrid formed of a mono-directional extruded material that is attached to the top of geotextile fabric and is of a greater material thickness and stiffness than the woven geotextile and is formed as a continuous strand of hollow rectangular structure along the top length of the woven geotextile.
A graduated silt fence comprising a woven geotextile fabric that includes a cross-plane permeability coefficient defining a permittivity which is increasing from one width edge and to the opposite width edge of the geotextile fabric, wherein the change in the permittivity is accomplished by a variation in weft material width, and wherein the variation in the permittivity throughout the geotextile width remains constant throughout the geotextile length, whereby when installed, the graduated silt fence provides a low permittivity for lower portions of the fence and as height increases, the geotextile fabric contains a greater permittivity created by variation in weft material width providing the permittivity within the textile structure allowing an increase in flow rate through the fence, and further including a support geogrid formed of a mono-directional extruded material that is attached to the top of geotextile fabric and is of a greater material thickness and stiffness than the woven geotextile and is formed as a continuous strand of hollow rectangular structure along the top length of the woven geotextile.
Dependencies are inferred from the claim text.