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When It Rains,It Drains
An ov
ervie
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Stor
mwat
er
Man
agem
ent
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Quality vs. Quantity
• How has stormwater runoff changed in quality over the past 100 years?
• How has stormwater runoff changed in quantity over the past 100 years?
• https://www.youtube.com/watch?v=0x-TDvnbheM
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Stormwater Runoff
• Water falls as rain, snow, or ice
• Most water seeps into the ground
• If the ground is saturated, frozen, or has an impermeable surface, water flows as runoff
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Point vs. Non-Point Source
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Point vs. Non-Point Source
• Point source:– Travels through a conveyance system– Regulated under permit program
• Non-point source:– Runoff that comes from a wide unspecific area– Addressed through voluntary programs
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Why is stormwater a problem?
• Human activities cause stormwater to decrease in quality and increase in quantity
• Caused by developed and disturbed land
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Where does stormwater go?
• Travels over land• Carried through Municipal Separate Storm
Sewer Systems (MS4)• Discharges into various creeks and streams• Ultimately, the creeks and streams discharge
into a larger body of water, like the Schuylkill River
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Where does stormwater go?
• Stormwater flows to storm drains along the street
• Water may carry pollutants with it
• This runoff goes to streams, rivers, lakes, and the oceans untreated
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Sediment Pollution
• Sediment comes from soil erosion and from decomposition of plants and animals
• Sediment makes water cloudy
• Sediment is the most common type of water pollutant
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Sediment Pollution Prevention
• Create vegetative buffers along bodies of water
• Minimize the amount of exposed soil
• Use silt fences when disturbing soil
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Oil and Grease Pollution
• The EPA estimates that 200 million gallons of oil are improperly disposed of each year
• 1 quart of oil can contaminate 1 million gallons of water
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Oil and Grease Pollution Prevention
• Fix vehicles that are leaking fluid
• If you change your own oil, store it in a container and dispose of properly
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Septic System Pollution
• The EPA estimates that 25% of homes in the U.S. use septic systems
• Over 4 billions gallons of wastewater per day is dispersed below ground through septic systems
• http://www.youtube.com/watch?v=gRz0wrwK8vs
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Septic System Pollution Prevention
• Have septic system pumped regularly• Fix a faulty septic system• Fix faulty toilets and leaky faucets to reduce
water going through the system• Don’t overload the septic system (ex: you
should do several loads of laundry over several days, rather than all in one day)
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Lawn Chemical Pollution
• Lawn chemicals are fertilizers, herbicides, and insecticides
• Over-application can result in toxic levels of chemicals and excessive nutrient runoff
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Lawn Chemical Pollution Prevention
• Conduct a soil test• Don’t over-fertilize• Use chemicals
according to their instructions
• Landscape with native plants
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Thermal Pollution
• Rain or snowmelt running over pavement picks up heat from asphalt and concrete
• Warm runoff raises the temperature of bodies of water
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Thermal Pollution Prevention
• Install permeable pavement to allow water to infiltrate into the soil
• Plant vegetation in riparian zones to increase shade
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Non-Structural BMPs
• Pollution prevention and source control• Street sweeping• Stormwater collection system cleaning and
maintenance• Low-impact development and land-use
planning• Public education
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Structural BMPs
• Green roofs• High density
residential areas• Grassed/porous
pavement• Silt fences
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Rain Gardens
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Rain Gardens
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Rain Impoundment Basin
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Benefits of Stormwater Management• Enhances opportunities
for recreation• Reduces flood damage• Improves drinking
water quality• Benefits aquatic
organisms• Reduces illness• Enhances aesthetic
value