For drainage areas exceeding what size is a sediment basin required?

A sediment basin is a temporary structure designed to collect sediment from runoff water, allowing particles to settle before the water is discharged. The requirement for a sediment basin generally becomes necessary for drainage areas exceeding 5 acres. This threshold is established to ensure effective sediment control in larger sites where there's a greater potential for erosion and sediment transport. When the drainage area is 5 acres or more, the volume of runoff increases, leading to a higher risk of sediment leaving the site.

By requiring a sediment basin at this size, regulations aim to mitigate water quality issues downstream and reduce the impact of construction or land development activities on surrounding ecosystems. Having a sediment basin in place allows for a more effective management of sediment loads, protecting water bodies and preserving ecological integrity.