Stormwater Post-Construction Site Runoff Control

Benton County Stormwater Program – Post-Construction Site Runoff Control

Increased impervious surface associated with development will increase stormwater volume and degrade water quality, which can harm lakes, rivers, streams, and coastal areas.

The best way to mitigate stormwater impacts from new developments or redevelopment is to use practices to treat, store, and infiltrate runoff onsite before it can affect water bodies downstream.

Innovative site designs that reduce impervious surface and smaller-scale low impact development practices dispersed throughout a site are excellent ways to achieve the goals of reducing flows and improving water quality.

In order to meet long-term stormwater management goals, Benton County has developed and implemented Long-Term Stormwater Management Code requirements that apply to any person or business creating a ground-disturbance of 1-acre or more or a cumulative disturbed area of 1-acre or more, OR any activity that results in 25,000 square feet of impervious surface.

Long-Term Stormwater Management Code Requirements (see below)
Please note that any construction project may require long-term stormwater management, at the discretion of the county engineer.

There are many ways to reduce long-term water quality impacts. Visit the Resources page for more information or contact Benton County staff with questions.