Green Roofs: Stormwater Management And Urban Heat
Green Roofs: StormwaterManagement and Urban HeatIsland MitigationPresenter:Jason T. BernerLandscape ArchitectEPA Office of Water, Office of Science andTechnology
Jason Berner National StormwaterTeam member Environmental Impacts& Benefits Assessments Water Quality Modeling Urban Planning andPolicy Analysis
Outline1) Urban Stormwater Water QualityImpacts2)Overview of Green Roofs3) Stormwater Related Benefits ofGreen Roofs4) Examples Applications of GreenRoofs for Stormwater Mitigation5) Tools and Resources for GreenRoofs
Water Quantity Impacts:Changes in Land-Water Linkages
Green Roof Overview Enhances or restores naturalhydrologic cycle (evapotranspiration,retention, minimizes runoff) Vegetation and storage media used forstormwater retention Small storm events (less than .25 to .5inches) in Washington, DC metro area Reduces outside building temperaturesSources: American Society of Landscape Architects (ASLA) (2010) & D. Sample (2010)
Types of Green Roofs Extensive: light vegetation, sedums andgrasses Intensive: medium size vegetation,including shrubs and small woody plantsHybrid green roofIntensive green roofSource: ASLA (2010): http://www.asla.org/ContentDetail.aspx?id 25420
Applications of Green Roofs New DevelopmentRedevelopmentRetrofitsCommercial, Residential, Industrial,and Institutional Building TypesNew Development, Commercial Building, Washington, DC
Benefits of Green Roofs Increases on site retention of stormwater, decreasestotal volume and flow to municipal stormwatersystems Overall reduction in nutrient loadings (Nitrogen &Phosphorus) Enhancement of local site biodiversity Increases stakeholder awareness of local sitestormwater management
Benefits of Green Roofs Increase aesthetic appeal and property valueof property Minimal maintenance costs Less replacements than conventional roofs Possible tax incentives, stormwater utilityfees
Examples of Green Roofs American Society of LandscapeArchitects (ASLA) Green Roof,Washington, DC (Commercial BuildingRetrofit) Monitored stormwater runoff reduction andtemperature reductions Retention of 76.7 % of 11.83 inches rainduring 1st data collection period (Summer –Fall)Source: ASLA (2010): http://www.asla.org/ContentDetail.aspx?id 25362 & http://www.asla.org/ContentDetail.aspx?id 25420
Examples of Green Roofs City Hall, Chicago, IL (institutionalretrofit) Planted in 2000, with over 150 speciesof plants (extensive and intensive) Green Roof able to retain 75% of 1 inchrain eventSources: City of Chicago (2010):Wild New Jersey doe/supp info/chicago s city hallrooftopgarden.html dge-office-on-morristown.aspx
Examples of Green Roofs DC Green Build Out Model (Casey Trees& LimnoTech) Scenarios of how Green Roofs and Treescould be used to mitigate stormwaterdischarges throughout Washington, DC Stormwater Runoff volume reductions upto 10% city-wideSource: Casey Trees (2008): ment/gbo/index.php
Tools & Resources forGreen Roofs Websites: Green Roofs for Healthy Cities (green roofindustry association website): http://www.greenroofs.org/ EPA Green Infrastructure Technologiesand Approaches hnology.cfm EPA Stormwater Menu of ps/index.cfm
Tools & Resources for GreenRoofs Design Tools EPA Models: SWMM (stormwater management model) SUSTAIN (System for Urban StormwaterTreatment and Analysis Integration Model): GISbased with SWMM Stormwater Calculators: Green Values National Stormwater ManagementCalculator (Center for NeighborhoodTechnology) Virginia Runoff Reduction Method (BMP designspreadsheet, VA Dept. Conservation &Recreation)
Thank You, Questions?Contact Information:Happy Free Laborers!!Jason T. BernerLandscape ArchitectEPA Office of Water,Office of Science and Technology,Engineering and Analysis DivisionEmail: Berner.Jason@epa.govPhone: 202-564-9868Website: fmSource: Clean Air Through Green Roofs 9/08/green-roofs-do-require-maintenance.html
Presentation that describes green roofs and benefits in reducing stormwater. Provides green roof case studies and an overview of tools and resources for green roofs. Keywords: Green Roofs, Stormwater Management, Urban
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