The resulting siltation, and the contribution of other pollutants from construction sites, can cause physical, chemical, and biological harm to our nation's waters. For example, excess sediment can quickly fill rivers and lakes, requiring dredging and destroying aquatic habitats. Stormwater runoff is rainfall or snowmelt that runs off the ground or impervious surfaces such as buildings, roads, and parkways into natural or manmade drainage ways.
Improperly controlled runoff can cause serious problems and downstream impacts, especially in areas where urbanization occurs. During urbanization and most land disturbing activities the percentage of impervious surfaces increases directly causing the percentage of runoff to increase. This increased runoff uncontrolled can damage roads, utilities lines, bridges, flood homes and yards, and erode stream banks adversely effecting the natural flora and fauna of the associated waterways.
The following runoff control BMPs can be used to reduce these effects from increased runoff: pipe slope drains, runoff diversion measures, level spreaders, subsurface drains, and construction de-watering. These controls have demonstrated the ability to effectively treat runoff volume to reduce the amounts of pollutants discharged to downstream waterways. Examples of these BMPs are wet detention ponds, dry detention ponds, underground detention systems, stormwater wetlands and bioretention areas.
Skip to main content. Pollution Prevention All stormwater management plans must should that polluted runoff is reduced to best extent practicable. Note — It is recommended that users check this site periodically for the latest updates to the spreadsheet. Updates are made as calculation or functional errors are identified and corrected. A new version number will be provided only when changes or enhancements are made to the spreadsheet, not when errors are corrected.
Act Chapter ePermit. Government that Works Protect clean air, clean water, and public health and conserve working farms, forests, and natural lands. Update: The Department will be revising sections of the BMP Handbook on a section-by-section basis, and due to these revisions the full version of the manual has been taken down.
All sections of the handbook are still available through the links provided below. Click here to download the most recent documents that will help you obtain, maintain, or terminate coverage under the General Permits. Click here to download any of the applications or forms that will help you obtain or terminate coverage under the General Permits.
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