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Suggested Citation:"Appendix C: Water Science and Technology Board." National Academies of Sciences, Engineering, and Medicine. 2016. Using Graywater and Stormwater to Enhance Local Water Supplies: An Assessment of Risks, Costs, and Benefits. Washington, DC: The National Academies Press. doi: 10.17226/21866.
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C

Water Science and Technology Board

GEORGE M. HORNBERGER, Chair, Vanderbilt University, Nashville, Tennessee

EDWARD J. BOUWER, Johns Hopkins University, Baltimore, Maryland

DAVID A. DZOMBAK, Carnegie Mellon University, Pittsburgh, Pennsylvania

M. SIOBHAN FENNESSY, Kenyon College, Gambier, Ohio

BEN GRUMBLES, U.S. Water Alliance, Washington, DC

GEORGE R. HALLBERG, The Cadmus Group, Inc., Boston, Massachusetts

ARTURO A. KELLER, University of California, Santa Barbara

CATHERINE L. KLING, Iowa State University, Ames

LARRY LARSON, Association of State Floodplain Managers, Madison, Wisconsin

DINAH LOUDA, Veolia Institute, Paris, France

STEPHEN POLASKY, University of Minnesota, St. Paul

MARYLYNN V. YATES, University of California, Riverside

JAMES W. ZIGLAR, SR., Van Ness Feldman, Potomac, Maryland

Staff

ELIZABETH EIDE, Acting Director

LAURA J. EHLERS, Senior Staff Officer

STEPHANIE E. JOHNSON, Senior Staff Officer

ED DUNNE, Staff Officer

M. JEANNE AQUILINO, Financial/Administrative Associate

BRENDAN R. McGOVERN, Senior Project Assistant

Suggested Citation:"Appendix C: Water Science and Technology Board." National Academies of Sciences, Engineering, and Medicine. 2016. Using Graywater and Stormwater to Enhance Local Water Supplies: An Assessment of Risks, Costs, and Benefits. Washington, DC: The National Academies Press. doi: 10.17226/21866.
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Page 207
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Chronic and episodic water shortages are becoming common in many regions of the United States, and population growth in water-scarce regions further compounds the challenges. Increasingly, alternative water sources such as graywater-untreated wastewater that does not include water from the toilet but generally includes water from bathroom sinks, showers, bathtubs, clothes washers, and laundry sinks- and stormwater-water from rainfall or snow that can be measured downstream in a pipe, culvert, or stream shortly after the precipitation event-are being viewed as resources to supplement scarce water supplies rather than as waste to be discharged as rapidly as possible. Graywater and stormwater can serve a range of non-potable uses, including irrigation, toilet flushing, washing, and cooling, although treatment may be needed. Stormwater may also be used to recharge groundwater, which may ultimately be tapped for potable use. In addition to providing additional sources of local water supply, harvesting stormwater has many potential benefits, including energy savings, pollution prevention, and reducing the impacts of urban development on urban streams. Similarly, the reuse of graywater can enhance water supply reliability and extend the capacity of existing wastewater systems in growing cities.

Despite the benefits of using local alternative water sources to address water demands, many questions remain that have limited the broader application of graywater and stormwater capture and use. In particular, limited information is available on the costs, benefits, and risks of these projects, and beyond the simplest applications many state and local public health agencies have not developed regulatory frameworks for full use of these local water resources.

To address these issues, Using Graywater and Stormwater to Enhance Local Water Supplies analyzes the risks, costs, and benefits on various uses of graywater and stormwater. This report examines technical, economic, regulatory, and social issues associated with graywater and stormwater capture for a range of uses, including non-potable urban uses, irrigation, and groundwater recharge. Using Graywater and Stormwater to Enhance Local Water Supplies considers the quality and suitability of water for reuse, treatment and storage technologies, and human health and environmental risks of water reuse. The findings and recommendations of this report will be valuable for water managers, citizens of states under a current drought, and local and state health and environmental agencies.

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