center for watershed protection vaco/vml meeting june 2, 2010 david j. hirschman program director
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Center for Watershed Protection
VACO/VML Meeting
June 2, 2010
David J. HirschmanProgram Director
Center for Watershed Protection
Center for Watershed Protection
• Non-profit 501(c)3, non-advocacy organization founded in 1992• Work with watershed groups, local, state and federal
governments• Provide tools to communities to protect lakes, rivers, streams,
and estuaries• 20 staff in Ellicott City, MD; Field Offices in Charlottesville, VA &
Ithaca, NY
www.cwp.org
Center for Watershed Protection
Center for Watershed Protection
$20K per acre
Center for Watershed Protection
Center for Watershed Protection
Stormwater Program Trade-Offs
Lots of Land Covered
Low Cost Uncertain Outcomes
Moderate Land Covered
Moderate Cost
Fairly Certain Outcomes
Small Areas Covered
High Cost Excellent Outcomes
Center for Watershed Protection
Menu of Practices
• Green Roof*• Impervious
Disconnection*• Raintanks &
Cisterns*• Permeable
Pavement*• Grass Channels• Bioretention• Water Quality Swale
• Infiltration• Extended Detention
Pond• Soil Amendments*• Filtering Devices• Stormwater
Wetland• Wet Pond• Sheet Flow/Open
Space*
Center for Watershed Protection
Hirschman’s Heroes
1. Watershed Forestry2. Rainwater Harvesting3. Bioretention4. Turf/Nutrient Management5. Nutrient Trading
Center for Watershed Protection
1. Watershed Forestry
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save energy improve air quality provide habitat better quality of life neighborhood stability aesthetic values increase property
value reduce noise good for business
Trees are the original “multi-taskers”
Center for Watershed Protection
American Forests’ Urban Ecosystem Analysis
• The Washington, DC metropolitan area has 187,767 acres of tree canopy
• Stormwater retention capacity of the urban forest is 949 million cubic feet in avoided storage of water
• This storage capacity is valued at $4.7 billion (based on cost of $5/cubic foot to build equivalent retention facilities)
Source: American Forests (2002)
Center for Watershed Protection
Influence of Forests and Impervious Cover on the Health of Streams
• Impervious cover
• Watershed tree cover
• Riparian buffer tree cover
Excellent good fair poorExcellent good fair poor
80-80-
70-70-
60-60-
50-50-
40-40-
30-30-
20-20-
10-10-
00
Stream health rating
perc
en
t
(Goetz, et.al, 2003)
For 245 watershedsFor 245 watersheds
Recommendations:Recommendations:
No more than 6% ICNo more than 6% ICAt least 65% riparian At least 65% riparian forest cover for Excellent forest cover for Excellent scorescore
No more than 10% ICNo more than 10% ICAt least 60% riparian At least 60% riparian forest over for Good score forest over for Good score
Center for Watershed Protection
Identify forest conservation and reforestation priorities
Center for Watershed Protection
Promote conservation of existing forests
Photo courtesy of Harford County DPW
Photo courtesy of Randall Arendt
Center for Watershed Protection
Preserve/Restore aquatic buffers
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Protect trees during construction
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Require trees along new streets
More shade means more time between repaving. 20% shade on a street improves pavement condition by 11%, which is a 60% savings for
resurfacing over 30 years.
Center for Watershed Protection
Plant trees in stormwater practices
Center for Watershed Protection
Frederick County, MD SchoolsFrederick County, MD Schools
Since 2005, more than 4,500 trees have been planted.
By spring 2010, we will have planted more than 15 acres of new trees.
Slide Credit: Frederick Co, MD
Center for Watershed Protection
2. Rainwater Harvesting
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Source: Sanitation District No. 1 of Northern
Kentucky
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3. Bioretention
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Year 1
Year 3
Year 10
Improve with Age
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4. Turf/Nutrient Management
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5. Nutrient Trading – Watershed Based Program
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Stormwater Accounting
•Real World
•Model World
Center for Watershed Protection
The thatched roof for this building dripped rainwater into the stone carved channel in the foreground
Source: Wright Paleohydrological Institute
Center for Watershed Protection
During medieval times, vegetated roofs were used in Scandinavia to improve insulationSource: http://www.roofgreening.ca/section/view?fnode=30
Center for Watershed Protection
Hotel Atlantic View was established in 1928 as Hatteras Island's first hotel. It was built to provide accommodations for wealthy businessmen and industrialists of the era who traveled to the island for its renowned game hunting and sport fishing. Notice the cistern to the right of the building with the downspouts feeding it rain water from the roof.
Source: Hatteras Village – Then and Now (http://www.hatteras.biz)
Cistern
Center for Watershed Protection
Conclusions
• Consider practices with multiple/local benefits
• Participate in process to advocate for preferred practices
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