When it rains it drains
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When It Rains, It Drains. An overview of Stormwater Management. 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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When It Rains, It Drains

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When it rains it drains

When It Rains,It Drains

An overview of

Stormwater

Management


Quality vs quantity

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


Stormwater runoff

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


Point vs non point source

Point vs. Non-Point Source


Point vs non point source1

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


Why is stormwater a problem

Why is stormwater a problem?

  • Human activities cause stormwater to decrease in quality and increase in quantity

  • Caused by developed and disturbed land


Where does stormwater go

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


Where does stormwater go1

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


Sediment pollution

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


Sediment pollution prevention

Sediment Pollution Prevention

  • Create vegetative buffers along bodies of water

  • Minimize the amount of exposed soil

  • Use silt fences when disturbing soil


Oil and grease pollution

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


Oil and grease pollution prevention

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


Septic system pollution

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


Septic system pollution prevention

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)


Lawn chemical pollution

Lawn Chemical Pollution

  • Lawn chemicals are fertilizers, herbicides, and insecticides

  • Over-application can result in toxic levels of chemicals and excessive nutrient runoff


Lawn chemical pollution prevention

Lawn Chemical Pollution Prevention

  • Conduct a soil test

  • Don’t over-fertilize

  • Use chemicals according to their instructions

  • Landscape with native plants


Thermal pollution

Thermal Pollution

Rain or snowmelt running over pavement picks up heat from asphalt and concrete

Warm runoff raises the temperature of bodies of water


Thermal pollution prevention

Thermal Pollution Prevention

  • Install permeable pavement to allow water to infiltrate into the soil

  • Plant vegetation in riparian zones to increase shade


Non structural bmps

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


Structural bmps

Structural BMPs

  • Green roofs

  • High density residential areas

  • Grassed/porous pavement

  • Silt fences


When it rains it drains

Rain Gardens


When it rains it drains

Rain Gardens


When it rains it drains

Rain Impoundment Basin


Benefits of stormwater management

Benefits of Stormwater Management

  • Enhances opportunities for recreation

  • Reduces flood damage

  • Improves drinking water quality

  • Benefits aquatic organisms

  • Reduces illness

  • Enhances aesthetic value


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