Brian L. Taylor, P.E., and Drew A. Gangnes, P.E. - Green Roofs for ...
Brian L. Taylor, P.E., and Drew A. Gangnes, P.E. - Green Roofs for ...
Brian L. Taylor, P.E., and Drew A. Gangnes, P.E. - Green Roofs for ...
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Coordination with the City of Seattle to accept this approach <strong>and</strong> model is currently underway. It isMKA’s opinion that the assumptions in these studies are conservative; additional data from on-goingmonitoring <strong>and</strong> research programs is expected to support relaxing some of the conservative inputparameters. In addition to results presented, preliminary modeling <strong>for</strong> case studies indicates thatimplementing eco-roofs with other practices, such as roof ponding, could eliminate the need <strong>for</strong>underground detention tanks, pumps, <strong>and</strong> pipes, as well as increase the portion of eco-roof costspotentially offset by detention tank costs savings to over 50 percent (20).RECOMMENDATIONSMonitoring, demonstration projects, <strong>and</strong> research are needed to support further calibration <strong>and</strong>refinement of this <strong>and</strong> other eco-roof models. These data could allow conservative assumptions to berelaxed, improving the detention cost offsets provided by eco-roofs. Development of a continuous ecoroofhydrology model would allow more sophisticated analyses, account <strong>for</strong> specific weather patterns ata project site, <strong>and</strong> facilitate acceptance of eco-roof stormwater benefits by certain agencies.REFERENCES1. Hutchinson, D., Abrams, P., Retzlaff, R., <strong>and</strong> Liptan, T., Stormwater Monitoring Two Ecoroofs inPortl<strong>and</strong>, Oregon, USA, Proceedings of <strong>Green</strong>ing Rooftops <strong>for</strong> Sustainable Communities: Chicago2003.2. Miller, Charlie, Vegetated Roof Covers: A New Method <strong>for</strong> Controlling Runoff in Urbanized Areas,Proceedings of the 1998 Pennsylvania Stormwater Management Symposium, Villanova University, 1998.3. City of Seattle Title 22.800 Stormwater, Grading, <strong>and</strong> Drainage Control Code, Volume 3: FlowControl Technical Requirements Manual, November 2000.4. King County Surface Water Design Manual, King County Surface Water Management Division,1990.5. Stormwater Management Manual <strong>for</strong> the Puget Sound Basin, Washington Department of Ecology,1992.6. Stormwater Management Manual <strong>for</strong> Western Washington, Washington Department of Ecology,2001.7. Miller, Charlie, Approach <strong>for</strong> Analysis of <strong>Green</strong> Roof Runoff, <strong>Roofs</strong>capes, Inc.8. Graham, P. <strong>and</strong> Kim, M., Evaluating the Stormwater Management Benefits of <strong>Green</strong> <strong>Roofs</strong> ThroughWater Balance Modeling, Proceedings of <strong>Green</strong>ing Rooftops <strong>for</strong> Sustainable Communities: Chicago2003.9. Mentens, J., Raes, D., <strong>and</strong> Hermy, M., Effect of Orientation on the Water Balance of <strong>Green</strong>roofs,Proceedings of <strong>Green</strong>ing Rooftops <strong>for</strong> Sustainable Communities: Chicago 2003.Method <strong>for</strong> Quantifying Runoff Reduction of <strong>Green</strong> <strong>Roofs</strong><strong>Brian</strong> L. <strong>Taylor</strong>, P.E., <strong>and</strong> <strong>Drew</strong> A. <strong>Gangnes</strong>, P.E.9
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