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You should dig a trench that’s 6 to 8 inches deep so that when the silt fence stands up, it has at least 6 inches below ground. It’s important to firmly bury your silt fence into the trench you’ve dug to keep water from running underneath the fence into the pile of soil you’re containing. 

When deciding to replace or repair your existing fence, consider the 20% rule that fence builders reference. This rule states that if more than 20% of your fence needs repair, you should skip the repair and replace it. Additionally, if your fence is nearing the end of its life, it's often best to replace it.

Repairing the fence is a good option when you have minimal damage or damage from a specific event versus wear and tear. Your fence repair professional can assess the damage and compare the repair price with the cost of a new fence.

Silt fences are very effective when installed correctly and used in proper locations. However, there are places where they don’t work as well. This includes property with a concentrated water flow, where runoff could pool or cause a flooding hazard. You’ll also want to use caution when installing in areas susceptible to landslides. Your contractor will follow state guidelines and know when an alternate solution is more effective.

How long a fence should last depends on the type of fence, but a common split wooden fence should last seven to 10 years. Chain link can last much longer, with wrought iron and concrete lasting decades. If you're interested in your fence lasting as long as possible—and it's made of wood—consider sealing and treating the wood so it can stand up to the environment. Wood is the only fence type that requires this, as concrete and metal are almost always waterproof.