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Stormwater Management Technologies
Transcript of Stormwater Management Technologies
Bioretention & vegetated landscaping
Cluster building / reduced impervious area
http://www.epa.gov/nps/lid/ Tools Concepts Cluster development,
Minimize soil compaction,
Minimize total disturbed area,
Protect natural flow pathways,
Protect riparian buffers,
Protect sensitive areas,
Reduce impervious surfaces, and
Stormwater disconnection. We've all heard the buzzwords - green, sustainable - in regards to infrastructure. What does it actually mean in a real, practical sense for stormwater management? Resources Stormwater Management:The Old Way A little history: Collect rainfall as quickly as possible, and get it as far away as possible as soon as possible. Dams allowed flood waters to fill the reservoirs behind them, and release only enough flow to prevent downstream flooding. What the dams could not control, the levees could. When all else failed, call for the sand bags! Now-a-days. . . Keep the stormwater as close as possible to where it rained, and keep it there as long as possible. AND. . . Clean it up in the process! Sediments
Petroleum Products Stormwater Pollutes include... Stormwater Management Best Practices Structural Controls: you can build it… Retention / Detention Basins
Natural systems Water quality matters, too. Underground Detention Sedimentation Swirl Separators In-Line Sedimentation Vegetative Solutions Non-Structural Best Management Practices Education
Construction sites Recycling
Car washes Maintenance
Cleaning CB’s, Basins
Street sweeping Local Management Examples …the Drain Commissioner is responsible for ensuring that the drainage or stormwater management system of a subdivision is adequate for the development and for protecting downstream landowners and resources. The procedures, standards and recommendations set forth in these rules are designed for these purposes… Common Ordinance Themes Construction permits
Urban or rural Easements
Enforcement When surface water discharge is within a watershed where thermal impacts (cold water streams and designated drains) are a primary concern, deep wet detention basins shall be required…
As an alternative to conventional Retention Basin design, the Drain Commissioner's Office will allow the use of Bioretention for storm water management commonly known as Rain Gardens…
Direct discharge of untreated stormwater to a natural wetland is prohibited. All runoff from the development must be pre-treated…
In general, the most effective stormwater quality controls are infiltration practices, which reduce both the runoff peak and volume. To date, structural infiltration devices such as retention basins and, to a lesser degree, trenches have suffered high failure rates due to clogging … Other Local Trends We still rely on pipes to carry runoff from large sites to detention basins. Result! Demonstration of Pervious Concrete H i s t o r y How things have changed