Volume Reduction Provided by Eight Residential Disconnected Downspouts in Durham, North Carolina
Publication: Journal of Environmental Engineering
Volume 142, Issue 10
Abstract
One major concern of increased development is the proportion of directly connected impervious areas (DCIA) in urbanized watersheds. A cost-efficient opportunity to treat stormwater within existing residential and small-scale commercial developments is to disconnect roof gutter downspouts and direct impervious surface runoff over lawns. Four paired residential downspout disconnection sites in Durham, North Carolina, were studied to quantify volume and peak flow reduction. Hydrologic data were collected from January 22, 2013, to October 8, 2013. For each site, the performance of disconnected downspouts discharging water over existing lawn was compared for three varying factors: slope of lawn, length of run over lawn, and proportion of contributing roof area to receiving lawn area. Data were analyzed from approximately 60 storm events. Performance was evaluated by calculating volume reduction with and without the direct rainfall on the lawn, resulting in cumulative runoff volume reduction ranges of 57–99% and 49–99%, respectively. Findings indicate that this simple and inexpensive stormwater control measure (SCM) might be an important, yet heretofore minimally accounted for, tool to mitigate runoff.
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Acknowledgments
The authors thank Shawn Kennedy (North Carolina State University, Biological and Agricultural Engineering) and Bill Lord (North Carolina Cooperative Extension) for establishing the field study. Jason Osborn (North Carolina State University, Statistics Department) contributed greatly. Lastly, thanks to the Clean Water Management Trust Fund and the City of Durham, North Carolina, for funding this research.
References
ASTM. (2009a), “Standard test method for infiltration rate of soils using double-ring infiltrometer.” ASTM D3385, West Conshohocken, PA.
ASTM. (2009b), “Standard test method for laboratory determination of density (unit weight) of soil specimens.” ASTM D7263, West Conshohocken, PA.
Bartlett, H. J. (1914). “The relationship between wind direction and rainfall.” Q. J. R. Meterol. Soc., 40(172), 327–346.
Booth, D. (2005). “Challenges and prospects for restoring urban streams: A perspective from the Pacific Northwest of North America.” J. North Am. Benthol. Soc., 24(3), 724–737.
Borris, M., Viklander, M., Gustafsson, A., and Marsalek, J. (2013). “Simulating future trends in urban stormwater quality for changing climate, urban land use and environmental controls.” Water Sci. Technol., 68(9), 2082–2089.
Boston Water and Sewer Commission. (2014). “Downspout disconnection.” 〈http://www.bwsc.org/SERVICES/Programs/downspout/downspout.asp〉 (Mar. 24, 2014).
Burns, M. J., Fletcher, T. D., Walsh, C. J., Ladson, A. R., and Hatt, B. E. (2012). “Hydrologic shortcomings of conventional urban stormwater management and opportunities for reform.” Landscape Urban Plann., 105(3), 230–240.
California Environmental Protection Agency. (2009). “Downspout disconnection credit worksheet.” 〈http://www.swrcb.ca.gov/water_issues/programs/stormwater/docs/constpermits/wqo_2009_0009_app_212.pdf〉 (Apr. 9, 2014).
Center for Watershed Protection and Maryland Department of the Environment. (2009). “Appendix E.1: Stormwater credits for innovative site planning.” 〈http://www.mde.state.md.us/programs/Water/StormwaterManagementProgram/MarylandStormwaterDesignManual/Pages/Programs/WaterPrograms/SedimentandStormwater/stormwater_design/index.aspx〉 (Apr. 9, 2014).
City of Toronto. (2013). “Mandatory downspout disconnection.” 〈http://www1.toronto.ca/wps/portal/contentonly?vgnextoid=d490ba32db7ce 310VgnVCM1000071d60f89RCRD〉 (May 2, 2013).
Deletic, A., and Fletcher, T. (2006). “Performance of grass filters used for stormwater treatment—A field and modeling study.” J. Hydrol., 317(3–4), 261–275.
Durham County. (2014). “Welcome to the New Durham real property search!” 〈http://dev.spatialest.com/durham-nc/Property%20Record%20Card/〉 (Dec. 19, 2014).
EPA (Environmental Protection Agency). (2013a). “Low impact development (LID).” 〈http://water.epa.gov/polwaste/green/〉 (Oct. 21, 2013).
EPA (Environmental Protection Agency). (2013b). “National stormwater calculator v. 1.1” 〈http://www.epa.gov/nrmrl/wswrd/wq/models/swc/〉 (Jan. 28, 2014).
HOBOware version 2.0.0 [Computer software]. Onset Computer, Bourne, MA.
Holman-Dodds, J., Bradley, A., and Potter, K. (2003). “Evaluation of hydrologic benefits of infiltration based urban storm water management.” J. Am. Water Resour. Assoc., 39(1), 205–215.
Hunt, W. F., Hathaway, J. M., Winston, R. J., and Jadlocki, S. J. (2010). “Runoff volume reduction by a level spreader-vegetated filter strip system in suburban Charlotte, NC.” J. Hydrol. Eng., 499–503.
Knight, E. M. P., Hunt, W. F., and Winston, R. J. (2013). “Side-by-side evaluation of four level spreader-vegetated filter strips and a swale in eastern North Carolina.” J. Soil Water Conserv., 68(1), 60–72.
Konrad, C., Booth, D., and Burges, S. (2005). “Effects of urban development in the Puget lowland, Washington, on interannual streamflow patterns: Consequences for channel form and streambed disturbance.” Water Resour. Res., 41(7), W07009.
Lager, J. A., Smith, W. G., Lynard, W. G., Finn, R. M., and Finnemore, E. J. (1977). “Urban stormwater management and technology: Update and users’ guide.”, EPA, Cincinnati.
Line, D., White, N., Osmond, D., Jennings, G., and Mojonnier, C. (2002). “Pollutant export from various land uses in the upper Neuse river basin.” Water Environ. Res., 74(1), 100–108.
Line, D. E., and Hunt, W. F. (2009). “Performance of a bioretention area and a level spreader-grass filter strip at two highway sites in North Carolina.” J. Irrig. Drain. Eng., 217–224.
Line, D. E., and White, N. M. (2007). “Effects of development on runoff and pollutant export.” Water Environ. Res., 79(2), 185–190.
Low Impact Development Center. (2011). “About.” Beltsville, MD.
MDE (Maryland Department of the Environment). (2009). “Maryland stormwater design manual, volumes I & II.” Baltimore.
Metcalf and Eddy, Water Resources Engineers, and University of Florida. (1971). “Stormwater management model.” U.S. EPA, Washington, DC.
NCDENR (North Carolina Department of Environment and Natural Resources). (2007). “Stormwater best management practices manual.” Raleigh, NC.
NOAA (National Oceanic and Atmospheric Administration). (2012). “Annual climatology summary.” Durham, NC.
Pitt, R., Chen, S., Clark, S. E., Swenson, J., and Ong, C. K. (2008). “Compaction’s impacts on urban storm-water infiltration.” J. Irrig. Drain. Eng., 652–658.
Raimundo, M., Gaspar, R., Oliveira, A. V. M., and Quintela, D. A. (2014). “Wind tunnel measurements and numerical simulations of water evaporation in forced convection airflow.” Int. J. Therm. Sci., 86, 28–40.
R Core Team. (2013). “R: A language and environment for statistical computing.” R Foundation for Statistical Computing, Vienna, Austria.
Roy, A. H., et al. (2008). “Impediments and solutions to sustainable, watershed-scale urban stormwater management: Lessons from Australia and the United States.” Environ. Manage., 42(2), 344–359.
Sample, D. J., and Liu, J. (2013) “Best management practices fact sheet 9: Bioretention.” 〈http://pubs.ext.vt.edu/426/426-128/426-128_pdf.pdf〉 (Apr. 22, 2014).
SAS 8 [Computer software]. Cary, NC, SAS Institute.
Schueler, T. R., Fraley-McNeal, L., and Cappiella, K. (2009). “Is impervious cover still important? Review of recent research.” J. Hydrol. Eng., 309–315.
Schwarz, C. J. (2013). “Regression—Hockey sticks, broken sticks, piecewise, change points.” Chapter 18, 〈http://people.stat.sfu.ca/~cschwarz/Stat-650/Notes/PDFbigbook-JMP/JMP-part019.pdf〉 (Jan. 30, 2014).
Shelton, D. P., Rodie, S. N., Feehan, K. A., Franti, T. G., and Pekarek, K. A. (2013) “Stormwater management: Disconnecting downspouts and impervious surfaces.” 〈http://ianrpubs.unl.edu/pages/publicationD.jsp?publicationId=1547〉 (Feb. 15, 2014).
Shockley Consulting Services, Black and Veatch, Williams-Creek Consulting. (2012). “Green infrastructure stormwater control measures—Strategies, practices and tools.” 〈http://www.dnr.mo.gov/env/wpp/stormwater/documents/gi-guide/gi-chapt6.pdf〉 (22 Apr. 2014).
Spence, P. L., Osmond, D. L., Childres, W., Heitman, J. L., and Robarge, W. P. (2012). “Effects of lawn maintenance on nutrient losses via overland flow during natural rainfall events.” J. Am. Water Resour. Assoc. 48(5), 909–924.
Thien, S. J. (1979). “A flow diagram for teaching texture by feel analysis.” J. Agron. Educ., 8, 54–55.
U.S. Census Bureau. (2015). “Quick facts.” 〈http://www.census.gov/quickfacts/table/PST045215/3719000,37063〉.
U.S. Department of Agriculture. (2007). “National engineering handbook.” Chapter 7, Hydrologic soil groups, Vol. 210, 6th Ed., V. Mockus, et al., eds., Natural Resources Conservation Service, Washington, DC.
Virginia Department of Conservation and Recreation. (2011). “Rooftop (impervious surface) disconnection.” 〈http://www.dcr.virginia.gov/stormwater_management/stormwat.shtml〉 (Apr. 30, 2013).
Walkowiak, D. K. (2011). “V-notch weir discharge tables.” ISCO open channel flow measurement handbook, 6th Ed., Teledyne ISCO, Lincoln, NE, 162.
Walsh, C., Fletcher, T., and Ladson, A. (2005a). “Stream restoration in urban catchments through redesigning stormwater systems: Looking to the catchment to save the stream.” J. North Am. Benthol. Soc., 24(3), 690–705.
Walsh, C., Roy, A., Feminella, J., Cottingham, P., Groffman, P., and Morgan, R. (2005b). “The urban stream syndrome: Current knowledge and the search for a cure.” J. North Am. Benthol. Soc., 24(3), 706–723.
Walsh, C. J., and Kunapo, J. (2009). “The importance of upland flow paths in determining urban effects on stream ecosystems.” J. North Am. Benthol. Soc., 28(4), 977–990.
Winston, R. J., Hunt, W. F., Osmond, D. L., Lord, W. G., and Woodward, M. D. (2011). “Field evaluation of four level spreader-vegetative filter strips to improve urban storm-water quality.” J. Irrig. Drain. Eng., 170–182.
Wood, O. (1937). “The interception of precipitation in an oak-pine forest.” Ecology, 18(2), 251–254.
Information & Authors
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Published In
Journal of Environmental Engineering
Volume 142 • Issue 10 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Feb 2, 2015
Accepted: Dec 3, 2015
Published online: Apr 11, 2016
Discussion open until: Sep 11, 2016
Published in print: Oct 1, 2016
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