Sediment is the number 1 contaminant in waterways according to the US EPA. A 1/2 acre development nets approximately 5 tons of sedimentation by erosion during the course of it's development.
Construction Site Runoff Control (Code 327 IAC 15-5 "Rule 5")
Construction site runoff control is essential to maintaining clean water. Construction disturbs soil at building sites and can generate large amounts of sediment. Sediment — if allowed to run into our lakes, streams, rivers, and wetlands - diminishes recreational use, reduces storage capacity and floodwater retention, degrades aquatic life, and depreciates property values. It is more affordable to prevent these problems than to correct them after they have occurred.
Post-Construction Runoff Control (Code 327 IAC 15-13 "Rule 13")
For the past two decades, the rate of land development across the country has been more than two times greater than the rate of population growth. If unchecked, the increased impervious surface associated with this development — roads, parking lots, and rooftops — will increase stormwater volume and degrade water quality, which can harm lakes, rivers, streams, and coastal areas.
The best way to prevent stormwater impacts from new development is to use practices to treat, store, and infiltrate runoff onsite before it can affect water bodies downstream. Innovative site designs that reduce imperviousness 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.
New development and redevelopment projects need to follow local requirements (see Partnership links) to protect water quality during post-construction stormwater management. This means using Best Management Practices (BMPs) to prevent negative impacts from stormwater running off the site.