How to Properly Install Silt Fence

Silt fence should follow the contour of the slope, not run in a straight line across it. Fence installed straight across a slope concentrates flow at low points along the line, increasing the chance of overtopping or undermining exactly where the barrier needs to hold.

The base of the fabric is entrenched into the soil and backfilled and compacted — not simply staked into the surface. A fence that isn't entrenched will have a gap underneath it that runoff flows through unfiltered, defeating the purpose of the barrier entirely regardless of how good the fabric is.

Stakes are driven on the down-slope side of the fabric at spacing appropriate to the expected load and site conditions, with enough embedment depth to resist the hydrostatic pressure of ponded water during a storm event. Under-spaced or shallow stakes are a common reason fence bows and eventually collapses under load.

Every fence run needs to terminate in a way that prevents flow from simply going around the end of the barrier — typically a J-hook or upslope return. Without this detail, water finds the path of least resistance at the fence's terminus and bypasses the entire installation.

Installation isn't a one-time event. Sediment accumulation should be monitored from the first rain event, with cleanout scheduled once sediment reaches roughly one-third to one-half of the fence height — well before it threatens to overtop the barrier.