00 90 01 H-Standard specifications for silt fence.pdf
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- Maintenance Dredging, Hudson River, NY Federal Navigation Project, Port of Albany Turning Basin Dredge Area
- Solicitation number
- W912DS21B0007
About this file
This document contains standard specifications for silt fence installation and materials requirements. Key details include specifications for silt fence posts, wire fencing, and fabric materials. Acceptable materials must meet minimum standards for grab tensile strength, elongation at failure, mullen burst strength, puncture strength, slurry flow rate, and ultraviolet radiation stability. Silt fences should be installed as close to the disturbed area as possible and below the fence the area must be undisturbed or stabilized. The specifications provide design requirements for post size and spacing, wire size, acceptable filter fabrics, and methods for anchoring and fastening the fabric.
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STANDARD AND SPECIFICATIONS
FOR
SILT FENCE
Definition
A temporary barrier of geotextile fabric (fdter cloth) used to intercept sediment laden runoff from small drainage areas of disturbed soil, Purpose
The purpose of a silt feuce is to reduce runoff velocity and effect deposition of transported sediment load. Limits im posed by ultraviolet stability of the fabric will dictate the maxim.um period the silt fence may be used.
Conditions Where Practice ApPlies
A silt fence may be used subject to the following conditions:
1. Maximum allowable slope lengths contributing runoff to a silt fence arc:
Slope Maximum Slope Steepness Length (Ft)
2:1 3:1 4:1 5:1
Flatter than 5: 1
2. Maximum drainage area for overland flow to a silt fence shall not exceed V2 acre per 100 feet of fence;
and
3. Erosion would occur in the form of sheet erosion; and
4. There is no concentration of water flowing to the barrier.
Design Criteria
Design computations are not required. All silt fences shall be placed as close to the area as possible, B.Dd the area below the (CIJce must be undisturbed or stabilized.
A detail of the silt fence shall be shown on the plan, and contain the following minimum requircmCIJts:
1. The type, size, and spacing of fence posts.
2. The size of woven wire support fences.
3. The type of filter doth used.
4. The method of anchoring the filter cloth.
5. The method of fastening the filter cloth to the fencing support.
Where ends of filter cloth come together, they 5hall be overlapped, foid·ed and stapled to prevent sediment bypass. See figure 5A.9 on page 5A.20 for details.
Criteria for Silt Fenc:e Materials
1. Silt Fence Fabric: The fabrie shall meet the following specifications unless otherwise approved by the ap propriate erosion and sediment control plan approval authority. Such ap proval shall not constitute statewide acceptance. Statewide acceptability shall depend on in field and/or laboratory observations and evaluations.
Fabric Properties
Grab Tensile Strength (lbs)
Elongation at Failure(%)
Mullen Burst StrcDgth. {PSI)
Minimum Acceptable
Puncture Strength (lbs) 40
Slurry F1ow Rate 0.3
(gal/min/sf)
Equivalent Opening Size 40-80
Ultraviolet Radiation 90 Stability (%)
Test Method
ASTMD1682
ASTMD1682
ASTMD3786
ASTMD751
(modified)
US Std Sieve
CW-02215
ASTMG-26
2. Fence Posts (for fabricated units): The length shall be a minimum of 36 inches long. Wood posts will be of sound quail� hardwood with a minimum cross sec• tional area of 3.0 square inches. Steel posts will be standard T and U section weighing not less than 1.00 pound per linear foot.
3. Wire Fence (for fabricated units): Y,ire fencing shall be a minim.um 14.1/2 gage with a maximum.6 in. mesh opening, or as approved.
4. Prefabricated Units: Envirofcnce or approved equal may be used in lieu of the above method providing the unit is installed per details shown in Figure 5A.9.
October 1991 - Third Printing PageSA.19 New York Guidelines for Urban Erosion and Sediment Control
Section 00 90 01 H-1 e3opardb Typewritten Text
Figure SA.9
Silt fence Details
WOVEN 'MRE FENCE (MiN, 1<l1J2 GAUGE,MAX. 6" MESi1
IO'Mt.X. C. TO C. SPACltlGlr -------~~~~~"____!_~----I J6'~MIN.FENCE POSTS,Di=lIVEN ~lN.
O:bJ1tIJ=[Jl-rTII,r~-rTI-jit~~'~6INTO GqQUNO
0"/ '7
8"t.!IN.
-----L
PERSPECTIVE VIEW
[36" MIN. FENCE PO:,:T
'NOVEN WfAE F'"ENCE ('4 ~'Z GA. MIN•• MAX.
6" MESH SPA.CING) WITH FIL.TER CLOTH OVER
l'N
UN~STUR8ED GROUND
E""SED FILTER CLOTH
MIN. 6 M
INTO GROUN~
CONSTRUCTION NOTES fOR fABRICATED SILT fENCE
1. WOVEN WIRE FENCE TO BE FASTENED SECURELY TO FENCE POSTS POSTS: STEEL EITHER 'T' OR 'U'
~11H WIRE TIES DR STAPLES_ TYPE OR 2' HAROWOOO
2. FILTER CLOTH TO BE TO BE FASTENED SECURELY TO WOVEN WIRE fENCE: WOVEN WIRE. 14 1/2 GA.
FENCE WITH TIES SPACED EVERY 24· AT TOP AND HID SECTION. 6" MAX. MESH OPENING
| 3. | WHEN TWO SECTIONS OF FILTER CLOTH ADJOIN EACH OTHER FILTER CLOTH: FILTER x. |
| THEY | SHALL B~ OVERLAPPED BY SIX INCHES AND FOLDED. MIFlAFI 1QOX:. $TA81L!NKA |
T140N OR APPROVED EQUAL.
4. HAINTENANCE SHALL BE PERFORMED AS NEEDED AND ~ATEAIAL PREFABRICATED UNIT: GEOFAB.
REMOVED WHEN "BULGES' DEVELOP IN THE SILT FENCE ENVIROFENCE, OM APPROVED
EGUAL.
U.S. OEPART~ENT OF AGRICULTURE STANDARD SYMBOL
SILT FENCESOIL CONSERVATION SERVICE
SYRACUSE, NEW YORK
New York Guidelines for Urban Page 5A.20 October 1991- Third Printing Erosion and Sediment Control
Section 00 90 01 H-2 e3opardb Typewritten Text e3opardb Typewritten Text
00 90 01 ATT. I-2
duckk Rectangle
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