Silt Sock

1. Step One

   1. All sock users should be aware of federal, state, and local laws, rules, regulations, or permit requirements for silt socks.

2. Step Two

   1. Socks installed on the vegetated ground can be installed without entrenchment. All gaps and ruts must be backfilled.
   2. Sock overlap should be in the direction of the flow with 24 inches minimum or as required by the local municipality.
   3. Stake or anchor as required by the manufacturer or stated under the approval.
   4. If sediment collects to 1/2 the height of the sock, then a second sock may be placed immediately upslope of the original sock.

3. Step Three

   1. Sock joint is where two sock sections meet on a level grade: overlap the adjoining ends, tighten the ends together, and add staking to each end.
   2. Where two sections meet on the un-level ground: j-hook higher elevated end, stake, and begin new section just below. Make sure to backfill any gaps.

4. Step Four

   1. Sock should be installed between 45° to 90° from direction of flow.
   2. Do not use socks below the normal high watermark perpendicular to flow in a river and where the maximum incline is greater than 50%.

The following silt sock conditions require maintenance:

• Deformation due to drive-over or dragging
  Action Required:
  • Re-contour by hand if applicable. If not, see applicable repair methods below.
• Sock rolling due to hydraulic force
  Action Required:
  • Reposition and add additional stakes.
• Loss of ground contact
  Action Required:
  • Fill in depressions and back-grout with chips from damaged section.
• Sediment accumulation of ½ sock height
  Action Required:
  • Remove accumulated sediment or install a second row of sock positioned on top of or up slope of the original sock

The following silt sock conditions require repair:

• Holes, rips or tears of the sock
  Action Required:
  • Small holes or narrow rips shorter than 12 inches may be stitched closed using plastic zip-ties. Tears longer than 12 inches require the sock be replaced.
• Pinch or localized diameter reduction of more than ½ the original diameter
  Action Required:
  • Install new section of sock up slope of the damaged section.