1 ASLA 2011 Annual Meeting and EXPO From Catchment to Reuse: Designing and Implementing Rainwater Harvesting Systems Presenters Heather Kinkade, FASLA, LEED AP BD+C President, Forgotten Rain Sandra A. Brock, PE, CFM ® , LEED AP BD+C Chief Engineer, Nitsch Engineering ASLA 2011 Annual Meeting and EXPO Agenda Introduction Rainwater Harvesting System Components Heather Water Budget Sandy Case Study: Heather Case Study: Sandy Q&A All ASLA 2011 Annual Meeting and EXPO Did You Know? Outdoor water use accounts for 30% of the 26 billion gallons of water consumed per day in the U.S (Source: USGBC) That’s 7.8 billion gallons of water per day for mostly irrigation! Aspenlandscaping.ca ASLA 2011 Annual Meeting and EXPO What is Rainwater Harvesting? Collecting stormwater from impervious surfaces and storing it for reuse
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Designing and Implementing Rainwater Harvesting Systems
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1
ASLA 2011 Annual Meeting and EXPO
From Catchment to Reuse: Designing and Implementing Rainwater Harvesting Systems
Presenters
Heather Kinkade, FASLA, LEED AP BD+C
President, Forgotten Rain
Sandra A. Brock, PE, CFM®, LEED AP BD+C
Chief Engineer, Nitsch Engineering
ASLA 2011 Annual Meeting and EXPO
Agenda
Introduction
Rainwater Harvesting System Components Heather
Water Budget Sandy
Case Study: Heather
Case Study: Sandy
Q&A All
ASLA 2011 Annual Meeting and EXPO
Did You Know?
Outdoor water use accounts for 30% of the 26 billion gallons
of water consumed per day in the U.S (Source: USGBC)
That’s 7.8 billion gallons of water per day for mostly irrigation!
Aspenlandscaping.ca
ASLA 2011 Annual Meeting and EXPO
What is Rainwater Harvesting?Collecting stormwater from impervious surfaces
and storing it for reuse
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ASLA 2011 Annual Meeting and EXPO
A New Idea?
Capturing and re-using rainwater is
not a new or complicated concept…
www.ens-newswire.com
ASLA 2011 Annual Meeting and EXPO
Why Rainwater Harvesting?
Rainwater harvesting can be used to
supply water for non-potable uses
Rainwater harvesting can be used
for stormwater management
ASLA 2011 Annual Meeting and EXPO
Rainwater Harvesting Benefits
Conserve potable water
– Reduce water/sewer bills ($$)
Protect water resources
– Reduce the volume of
stormwater runoff
– Improve stormwater quality
Demonstrate sustainability
– Contribute to LEED® Credits
for Stormwater and Water
Efficiency
ASLA 2011 Annual Meeting and EXPO
Design Considerations
Potential Supply
Rainfall patterns
Catchment area
Storage
Cisterns
Equipment
Reuse
Irrigation/seasonal
Toilet flushing /year-round
Water
Balance
Collection
Pretreatment
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ASLA 2011 Annual Meeting and EXPO
System Components
Aqua Azul
ASLA 2011 Annual Meeting and EXPO
System Components
and Maintenance
ASLA 2011 Annual Meeting and EXPO
Components and Maintenance
ASLA 2011 Annual Meeting and EXPO
Components and Maintenance
• General Information
– The operation and maintenance of rainwater harvesting systems is the
responsibility of the property owner.
– Municipal inspections occur during installation and inspections of backflow
prevention systems are recommended on an annual basis.
– For the property owner, the operation of a rainwater harvesting system is similar to
Rainwater Harvesting at NC State http://www.bae.ncsu.edu/topic/waterharvesting/index.html
NC State University Rainwater Harvester Computer Model http://www.bae.ncsu.edu/topic/waterharvesting/model.html
WEATHER DATA National Climatic Data Center http://lwf.ncdc.noaa.gov/oa/ncdc.html PRISM Precipitation Maps http://www.wrcc.dri.edu/precip.html Precipitation Averages, Seasonality,Volatility and Trends in the United States http://www.weatherbill.com/assets/LandingPageDocs/rainfallstudy2007.pdf California Irrigation Management Information System, Evapotranspiration http://www.cimis.water.ca.gov/cimis/infoEtoOverview.jsp
Nitsch Engineering’s RainUSE® software-based service uses a
proprietary program to analyze and optimize tanks for storing rainwater for reuse. For our clients, we assess historical rainfall data and simulate scenarios to capture and reuse rainwater. Now in Version 2.0, the RainUSE
® software-based service allows us to
estimate how successful a rainwater-reuse system may be in satisfying the water demands for a building project. This unique service helps clients save money while preserving natural resources. Background Historically, stormwater runoff has been considered an unavoidable, unwanted byproduct of development. Now, as sustainability has become a more important part of site development projects, many owners and design teams have started to integrate stormwater management best practices into their projects, including methods of capturing and reusing rainwater onsite. While most rainwater design tools rely only on the use of average annual rainfall data, Nitsch Engineering concluded that a more accurate simulation could be developed using historical daily rainfall data, which is why we developed and implemented the RainUSE
®
software-based service. For a small investment, which reaps big benefits, the RainUSE
®
software-based service helps clients get valuable data that can significantly save construction and operating costs, and exhibit sustainability. Stormwater runoff is reduced, which reduces the burden on the municipal drainage systems and helps decrease flooding. The building’s potable water demand is reduced, thus providing a return on investment. Applications RainUSE
® allows Nitsch Engineering to analyze non-potable water
demands on a continuous daily basis and incorporate additional make-up water inputs for a range of tank sizes, based on the historical daily rainfall from the nearest rain gauge and the project-specific paramters. The report generated by the RainUSE
® software
includes several graphs displaying the average annual potable water savings, non-potable water deficit, excess overflow from the tanks, and the average annual precipitation from the 30 most recent years of historical rainfall data. RainUSE
® also provides our engineers with
the daily output data simulated from the entire period of record for further analysis. Our proprietary RainUSE
® service can be used to simulate a variety
of reuse scenarios, including toilet flushing within a building, site irrigation, and cooling tower make-up demands. We also can calculate the inclusion of additional water supplies, such as geothermal well bleed-off or condensate, thus eliminating other discharges to the municipal sewer system.
RainUSE®: A Rainwater Reuse Analysis Service
www.nitscheng.com
Recent Successes The RainUSE
® service supports Nitsch Engineering’s cutting-edge site
sustainability practice, especially for projects pursuing LEED® certification. Using
the RainUSE® service to optimize and design rainwater harvesting systems on
projects could contribute up to five LEED® points toward certification. Nitsch
Engineering has found that rainwater reuse systems can be optimized to align with both stormwater management and water efficiency goals. Since 2005, Nitsch Engineering has provided the RainUSE
® service on a variety
of projects by optimizing systems, significantly saving construction and operating costs, and exemplifying sustainability. A sampling of projects:
Yale University School of Art and Architecture, New Haven, CT
Yale University Kroon Hall, New Haven, CT
Yale University Biology Building, New Haven, CT
Yale University School of Social Sciences, New Haven, CT
Harvard Allston First Science Building, Boston, MA
Bridgewater State College Rondileau Campus Center, Bridgewater, MA
Princeton University Chemistry Building, Princeton, NJ
Ithaca College School of Business, Ithaca, NY
Harvard Allston Master Plan, Boston, MA
Princeton University Master Plan, Princeton, NJ
Princeton University Chemistry Building, Princeton, NJ
Princeton University Andlinger Center, Princeton, NJ
Brooklyn Atlantic Yards, Brooklyn, NY
North 10th Street Multi-Family Residential Project, Williamsburg, NY
Brooklyn Bridge Park, Brooklyn, NY
High Line Open Space, New York, NY
J. Michael Ruane Judicial Center, Salem, MA
Massachusetts Fire Fighting Academy, Stowe, MA
Canal Park, Washington D.C Testimonials “Nitsch Engineering’s RainUSE
® software service has become an invaluable tool in
the development of rainwater capture systems. Atelier Ten has used the software on projects, notably the renovation of the Yale Art and Architecture Building and new History of Art Building, to size stormwater capture tanks carefully where space was particularly at a premium. … The RainUSE
® software has become an indispensable
part of Atelier Ten’s stormwater analysis process.” Paul Stoller, LEED AP, Director, Atelier Ten “Through intelligent strategies and modeling techniques, Nitsch Engineering has played a very important role in helping to make Brooklyn Bridge park the sustainable model for large-scale public open space. … With an ever-expanding demand for stewardship and sustainability in the public landscape, Nitsch Engineering as Site Sustainability Engineers has helped to provide our client with a smart and self-sustaining system while still adhering to a high standard of design.”
Stephen Noone, ASLA, Senior Associate, Michael Van Valkenburgh Associates, Inc. For more information Contact: Sandra A. Brock, [email protected] or Nicole Holmes, [email protected]