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Stormwater Management Technologies

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Prein Newhof

on 1 March 2013

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Transcript of Stormwater Management Technologies

THE TERMINOLOGY Porous Asphalt Never mix these up! Pervious Concrete Permeable Pavers Low Impact Development is an approach to land development (or re-development) that works with nature to manage stormwater as close to its source as possible. Low Impact Development, or LID When the natural landscape is replaced with roads, parking lots, roofs, and other impervious surfaces, rainfall can no longer soak into the ground. This results in a tremendous increase in polluted runoff. Rather than employing the traditional stormwater management approach that uses miles of costly pipes and acres of stormwater ponds to deal with this additional runoff, LID uses natural vegetation and small-scale treatment systems to treat and infiltrate stormwater runoff close to where it originates. Reducing the amount of stormwater runoff generated in the first place reduces impacts on streams carrying stormwater. http://www.semcog.org/LowImpactDevelopment.aspx SEMCOG's Low Impact Development Manual, 512 pages, is available online: Email Jim at jhegarty@preinnewhof.com What Why How Porous pavements
Green roofs
Bioretention & vegetated landscaping
Cluster building / reduced impervious area
Vegetated swales
Rain gardens
Wetlands http://www.lowimpactdevelopment.org/
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
Street surfaces
Soil erosion
Decaying matter
Heavy Metals
Petroleum Products Stormwater Pollutes include... Stormwater Management Best Practices Structural Controls: you can build it… Retention / Detention Basins
Sedimentation devices
Oil separators
Natural systems Water quality matters, too. Underground Detention Sedimentation Swirl Separators In-Line Sedimentation Vegetative Solutions Non-Structural Best Management Practices Education
Land-use planning
Inlet stenciling
Construction sites Recycling
Yard waste
Oil changes
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
Erosion controls
Drainage standards
Rainfall periods
Discharge limitations
Urban or rural Easements
Maintenance agreements
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
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