Katie Rousseau Clean Water Program American Rivers.

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Presentation transcript:

Katie Rousseau Clean Water Program American Rivers

Founded in 1973 to protect and restore America’s rivers 65,000 members and supporters nationwide

Drainage Systems

Contributors to the Problem Impervious Surfaces Combined Sewer Overflows Most cities across the country have an average of 45% of impervious surface. Studies show that water quality becomes degraded when total impervious surface exceeds 10%.

Stormwater Management Objectives The objective of BMPs is to minimize the adverse effects of development by mimicking, as closely as possible, the runoff characteristics of the site in its undeveloped state. These characteristics include: Moderation of runoff peak flows and volumes to minimize downstream erosion and damage to in-stream aquatic habitat. Removal of pollutants such as sediment, nutrients, pathological bacteria and heavy metals. Infiltration of rainfall to replenish the water table and provide stable base flow to streams.

Best Management Practices Selecting the right BMP Different BMPs are better suited for different aspects of stormwater treatment and control Sediment removal Nutrient removal Volume control Site characteristics Slope, soils, size, and development density Are there specific requirements? 1 inch storm 85% storm

Nonstructural Controls Protect Natural Features and Sensitive Areas Minimize Impervious Surfaces

Nonstructural Controls Stormwater Disconnection Conservation Landscaping Techniques Minimize Soil Compaction

Tree Canopy A 2007 study of Washington, DC found that use of urban trees and green roofs for stormwater management would keep 1.2 billion gallons of runoff out of the water infrastructure system. This equals a 10% reduction in untreated discharge entering local rivers and would reduce the frequency of combined sewer overflows by almost 7 percent. At the minimum, this would keep an estimated 120 pounds of copper, 180 pounds of lead, 340 pounds of phosphorous, and 530,000 pounds of total solids among other pollutants out of local waterways every year.

Silva Cells Rigid, stackable structures of glass and polysyrene compound with galvanized steel tube frames. Models predict a 10 percent reduction in peak stormwater flows as a result of Silva cell installation, and research indicates that the filtration offered by the soil within the cells will potentially remove more than 80 percent of phosphorus, 60 percent of nitrogen, and more than 90 percent of lead, copper, zinc, and iron.

Green Roofs Peak flow reduction Compost balance

Bioretention Performance Pollutant removal rates Sediment and bacteria (90%) Phosphorus (negative to 70%)* Nitrogen (35 to 65%) Metals (Zn, Cu, Pb) (65% or more) * Depends on soil-P levels in media

Rain Gardens Toledo Zoo

Infiltration Performance Pollutant removal rates Sediment and bacteria (90%) Phosphorus (65%) Nitrogen (35 to 50%) Metals (Zn, Cu, Pb) (65% or more) Great for temperature and runoff reductions *Limited or zero removal of soluble metals, chlorides and nutrients

Green Streets

Wet Ponds Performance The primary functions of a wet pond are to detain stormwater and facilitate pollutant removal through settling and biological uptake. Pollutant removal rates Sediment and bacteria (75%) Phosphorus (65%) Nitrogen (30%) Metals (Zn, Cu) (65% ) *Ice cover, geese, and poor geometry limit performance

Lawn Care Mow High: Longer grass is stronger grass; it grows deeper roots and better absorbs and filters rainfall. Return clippings: Mulching recycles organic matter and nutrients back into the soil where microbes and earthworms thrive. Rich soil helps absorb and filter rainfall, reducing erosion and runoff. Use the right fertilizer: For mature lawns, choose a fertilizer that is low in phosphorus or phosphorus-free. Clean up: Keep grass clippings and fertilizer off sidewalks, roadways and other hard surfaces and out of our waterways.

Thank you Katie Rousseau American Rivers