SHEET STATE PROJECT NUMBER _ n o s n h o J

. Limits of clearing a l Steel or wood post Varies e g Existing ground n See Typical Section Sheet

A e Fence support mesh (optional) (undisturbed) p : lo r s e Flow ill s F U _ Geotextile See note 5 30" min. NOTE: 1.Silt fence may be installed using machine 24" min. Backfilled and compacted soil ELEVATION slicing as approved by the CO. Install machine-sliced silt fence according to the Flow manufacturer's recommendations.

6" min. trench 2.Install silt fence to follow the ground contours as closely as possible. 18" min. 3.As the slope is constructed, curve the silt Varies fence up the slope to prevent water from 6" min. running around the ends.

4.Post spacingwith fence support mesh = POST AND GEOTEXTILE INSTALLATION DETAIL

e 10 ft. (max.)

Flow p o

See Note 4 l

s Post spacingwithout fence support mesh = for spacing f 6 ft. (max.) o

e o 5.Furnish geotextile conforming to subsection T 713.16(a).

PLAN

End posts SILT FENCE INSTALLATION AT TOE OF FILL See End Posts Detail e p o l s

e f p o o sl A ll e

i o F T

End posts Steel or wood posts Staple or tie See End Toe of slope Posts driven tightly together. Posts Detail Geotextile Top of posts tied together. Section B Edge of shoulder See Note 3 See note 5 Geotextile

n See Note 3

g Section A d Roadway . See note 5 0 5 - 7 5

1 ELEVATION PLAN C

\ Edge of shoulder s l i a t Fold geotextile around e END DETAIL Toe of slope D each post one full turn. _

4 Fasten fabric to posts. 1 P F \

4 PLAN

1 Silt fence - P F

\ PLAN POSTS AT JOINTS s

g A n i w a r D \ T I P D -

L S F he C et Silt fence \ Steel or wood post flo : Fill w N Geotextile

M See note 5 A

1

3 Existing ground U.S. DEPARTMENT OF TRANSPORTATION :

9 FEDERAL HIGHWAY ADMINISTRATION 2

: Staple or tie CENTRAL FEDERAL LANDS HIGHWAY DIVISION 9 PLAN U.S. CUSTOMARY DETAIL

END POSTS DETAIL SECTION A-A SILT FENCE

0 SILT FENCE AS PERIMETER CONTROL 2

0 DETAIL APPROVED FOR USE DETAIL 2 /

3 NO SCALE REVISED: 08/2014 07/2020 / C157-50 9

NOTES TO THE DESIGNER Last Updated: July 2020

General Information

1. Appropriate Applications. Silt fences filter and allow settlement of soil particles from sediment- laden water. Silt fences may be placed:  Below the toe of exposed and erodible slopes;  Along slope contours (not on gradients);  Around temporary stockpiles;  Along streams and channels; and  Along the perimeter of a project to contain sediments within project limits.

2. Limitations.  Silt fence is used only in sheet flow conditions, not in concentrated flow areas.  Silt fence is typically installed along the contour (constant elevation), not on slopes, to avoid channelizing water

3. Layout Guidance.  Maximum length of slope draining to any point along the silt fence is 200 feet or less.  Slope of area draining to silt fence is 1V:1H or flatter.  Avoid installing silt fence on slopes as much as possible – silt fence is typically installed along slope contours. See below:

Applicable SCRs None

Typical Pay Item Used  15705-0100 Soil erosion control, silt fence [LNFT]

Updates January 2011  Updated FLH Standard drawing by: o Removing silt fence in drainage ditch drawings and notes o Adding more installation notes and drawings August 2014  Updated for FP-14  Updated border July 2020  Update geotextile references Designer Notes for CFLHD Drawing 157-50