The Dirty Truth about Stormwater (April 23, 2011)

by Tom Barrett on Apr 24, 2011

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The dirty facts about what happens to surrounding Indianapolis waterways almost every time it rains. After you understand the limitations we are faced with relying on our current storm drain system, yo...

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The Dirty Truth about Stormwater (April 23, 2011) — Presentation Transcript

The GREENEconomy

How Much Rain Falls in Chicago?January - 1.86" Image of Rain FallingFebruary - 1.58"March - 2.59"April - 3.28"May - 3.75"June - 4.08"July - 3.39"August - 3.38"September - 2.91"October - 2.65"November - 2.09"December - 1.88"Total 33.44"

How Much Water Falls in Chicago? 2,500 sq. ft. RoofJanuary - ,727 gallons 2 Image of Rain FallingFebruary - ,540 2March - ,130 4April - 5,735May - ,268 5June - 5,657July - ,470 5August - ,200 7September- ,096 5October - ,223 4November - 4,691December - 3,787Total 6,525 5

How Much Water Falls in Chicago? 3 Acre Commercial PropertyJanuary - 42,560 gallons 1 Image of Rain FallingFebruary - 32,784 1March - 15,876 2April - 299,783May - 75,344 2June - 295,710July - 85,934 2August - 76,358 3September - 66,383 2October - 20,764 2November - 245,203December - 197,954Total 2,954,654

How Much Water Falls in Chicago? City Block (660’ x 660’ – 10 acres)January - 75,195 gallons 4February - 42,610 4March - 19,581 7April - 999,267May - 17,805 9June - 985,690July - 53,105 9August - ,254,515 1September - 87,936 8October - 35,873 7November - 817,335December - 659,842Total 9,848,756

Low Impact Site Development

Stormwater MitigationStormwater MitigationStormwater MitigationStormwater MitigationStormwater Mitigation

Peak Flow (2,500 ft. sq. Roof) Grass Field Roof1 Year Storm 36 gpm 111 gpm2 Year Storm 54 gpm 139 gpm10 Year Storm 111 gpm 206 gpm25 Year Storm 147 gpm 245 gpm100 Year Storm 206 gpm 309 gpm gpm – gallons per minute

Peak Flow (1 Acre Site) Grass Field Roof1 Year Storm 630 gpm 1,932 gpm2 Year Storm 942 gpm 2,424 gpm10 Year Storm 1,932 gpm 3,588 gpm25 Year Storm 2,556 gpm 4,266 gpm100 Year Storm 3,588 gpm 5,388 gpm gpm – gallons per minute

Change in Peak Runoff Flow Before and after Development300%225%150% 75% 0% m m m m m S tor S tor S tor S tor S tor ar r r r r Ye ea Ye a Ye a Ye a 1 2Y 10 25 0 10 Stormwater Effects of Urbanization

Image of Rain Falling

Pesticide IssuesAtrazine, Nitrogen, Phosphorous

Stormwater Mitigation– Collection runoff near the source– Slow it down– Soak it in– Filter it– Apply it to the landscape– Create habitats

Simple Rain garden

Bioswales Engineered Soils Underdrain

Location Plant Choices Rain gardens are often located at the end of a roof or drain spout. Choose plants based on the need for light and soil type. Depth Size Soil A Rain Garden usually A tpical mix is 65% A typical Rain Garden five to ten percent of sand, 15% top soil, is between four to the impervious surface 25% organic matter. eight inches deep. area.Rain Gardens

Rain Garden

BioswalesBurnsville, Minnesota

Native Vegetationwww.epa.gov/greenacres/ www.for-wild.org

Street Edges& Medians

Parking LotEdges

Parking LotIslands

DrivewayEdge

Neighborhoods

Rain GardenIndianapolis

Rain Garden Indianapolis - Fall Creek Parkway

Functional Landscapes

Thank You

The Dirty Truth about Stormwater (April 23, 2011)

by Tom Barrett on Apr 24, 2011

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The Dirty Truth about Stormwater (April 23, 2011) — Presentation Transcript