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Gutters to Gardens Capturing Urban Storm Water
Diverting water from your downspout into rainwater catchment systems has several advantages
~Reduces the volume of water flowing to the sewer treatment facility
~Lowers the percentage of roof top rainfall as a component of urban runoff
~Backup source of water during times of drought or between rain showers
~Helps to keep our creeks and beaches clean
•Naturally softened water - great for delicate houseplants, auto cleaning and window washing
•Saves money by lowering your water bill
•Reduces the need for additional tax dollars earmarked for sewer expansion
•Chlorine-free water helps maintain a healthy biotic community in the soil
•Educational tool for teaching residents about water conservation
Gutters to Gardens Capturing Urban Storm Water
•Local Vendor•Recycled Materials•Low VOC paints•Local Labor
Modeling the Value of the Urban Tree Canopy
An Ecological Services Assessment
April 2009 Project Partners: Grand Rapids Planning Department and JJR, Inc.
April 2008
• Presentation by:– Rod Denning, Research Associate - GISP– Grand Valley State University – Annis Water Resources Institute,
740 W. Shoreline Dr., Muskegon, MI 49441– Contact: [email protected] or 616-331-3793
Modeling the Value of the Urban Tree Canopy
An Ecological Services Assessment
What are we trying to do?
• TWO GOALS…..– Quantify the presence of the urban tree canopy
• How much land area in the city has tree canopy?
– Place a monetary value on the ecological services being provided by urban trees
• Can we calculate this for the entire city?
Urban Forest Assessment - ResultsAIR POLLUTION REMOVAL
Air Pollutant
Pounds Removed per year**
Money Saved from Removal*
Carbon Monoxide 17,880 $7,631
Ozone 295,023 $906,375
Nitrogen Dioxide 107,281 $329,591
Particulate Matter: Less then 10 microns 196,682 $403,428
Sulfur Dioxide 44,700 $33,546
Total 661,566 $1,680,570
** Based on Air Pollution conditions for the City of Milwaukee, Wisconsin
* Dollars are “externality” costs borne by society due to rising health care expenditures and reduced tourism revenue.
Urban Forest Assessment - ResultsSTORMWATER RUNOFF
2-year, 24-hour Rainfall event: 2.37 inches
Curve Number of existing conditions: 78
Curve Number if the trees were replace with buildings: 89
Additional Stormwater storage volume needed if the trees were replaced with buildings: 67,075,658 ft3
Construction cost per ft3* $5.50
Total Stormwater Savings: $368,916,122
Annual costs based on payments over 20 years at 6% interest $32,163,789 per year
* Construction costs based on the cost to build just an ADS Storm Tech System to handle the additional stormwater
April 2008
Urban Forest AssessmentFINAL RESULTS SUMMARY
• Air Pollution Removal: $1,680,570 annually• Stormwater Runoff: $368,916,122 or $32,163,789
annually• Carbon Storage: $1,578,578 (presently stored in the
trees) or $12,290 worth of storage per year• Water Quality Benefits: $????
• THE CITY’S 35 PERCENT TREE CANOPY PROVIDES TOTAL DOLLAR BENEFITS OF: $372,175,270