What is the purpose of a sediment control measure such as a silt fence around a disturbed area?

• A. To promote vegetation growth.
• B. To permanently store sediment.
• C. To intercept and trap sediment-laden runoff before it leaves the site.
• D. To diversify soil nutrients.

Answer: (C)

Sediment control measures are designed to keep dirt from leaving a site with stormwater. A silt fence serves as a filter along the edge of a disturbed area. It intercepts runoff, slows it down, and traps sediment carried by the water so only clearer water moves off-site. This protects downstream water quality and helps the site meet erosion-control requirements. It isn’t meant to promote vegetation growth, permanently store sediment, or add nutrients to the soil. It’s a temporary barrier that works best when used with stabilization practices like seeding, mulch, or mulch, and it should be maintained: inspect after storms, remove accumulated sediment, and repair or replace as needed to stay effective.