Perimeter & Sediment Control
The perimeter is where a site proves it is being run well. These are the controls that ring the disturbed ground and guard the low points — the first line installed and the last one removed. Terradyne installs and maintains the full set across the Dallas–Fort Worth metroplex.
What perimeter and sediment control does
Perimeter and sediment controls share one job: keep disturbed soil on the site instead of in the street, the storm drain, or the neighbor's lot. A stormwater pollution prevention plan (SWP3) must be prepared and implemented before construction activities begin. That plan is where the perimeter gets laid out, and the controls go in before the ground opens up.
The controls
- Silt Fence Installation is the workhorse — a fabric barrier trenched along the downhill edge to filter sheet-flow runoff. It handles most of the perimeter on most sites.
- Sediment Logs & Wattles are filled tubes for contours, curb lines, and slope toes — the light, movable option where a trench cannot go.
- Rock Filter Dams step down concentrated flow in the ditches and swales that silt fence cannot handle.
- Storm Drain Inlet Protection is the last line before runoff enters the public system, matched to the inlet type.
The right combination depends on where a site's water goes — sheet flow, concentrated flow, and the inlets each take a different control.
Frequently Asked Questions
Which perimeter control does my site need?
Usually more than one. Silt fence handles the sheet-flow edges, check dams handle the ditches, and inlet protection guards the drains — most sites use a mix, matched to how and where the water moves. The plan sheet and the local detail set the specifics.
Why does silt fence keep failing on my site?
Almost always because it is in the wrong place or built wrong: fabric run across concentrated flow instead of sheet flow, posts spaced too far, or the toe never trenched in. Concentrated flow wants a rock check dam, not fence, and a fence loaded past capacity needs cleaning out before the next storm, not after.
Where this fits
Perimeter and sediment control is one family within Erosion Control Services — the controls that guard the site's edge and its inlets. Where water concentrates into a channel, or where slopes and exits need their own protection, the other erosion control families pick up where the perimeter ends. Most sites run several families together, sequenced by phase.
Request a bid
Send your plans to bids@terradynegroup.com or call (214) 878-7392 for perimeter and sediment control installation. Tell us the site and we will spec the perimeter.