ࡱ> MOL%` SbjbjNN 7",,S @ @ @ @ $d >:  u u u J>L>L>L>L>L>L>$@hmBp>pu u ppp> >p  J>pJ> x P0k&@  J>>0>CC"Cl+u I N u u u p>p>u u u >pppp$d ECOLOGICAL LIMITS OF HYDROLOGIC ALTERATION (ELOHA): INTEGRATING ENVIRONMENTAL FLOWS INTO BASIN AND STATE WATER RESOURCES PLANNING AND MANAGEMENT Poster abstract FOURTHUSACE-CONSERVANCY PARTNERSHIP CONFERENCE: "Projects to Systems: Restoring and Protecting our Nation's Natural Capital" Skamania Lodge, Stevenson, Washington October 26-28, 2009 Apse, C1, Kendy, E2, DePhilip, M3, Flack, S4, ONeill, C5, and Zimmerman, J4 1The Nature Conservancy, 14 Maine Street, Suite 401, Brunswick, ME 04011,  HYPERLINK "mailto:capse@tnc.org" capse@tnc.org 2 The Nature Conservancy, 656 N. Ewing, Helena, MT 59601 3The Nature Conservancy, 2101 N. Front Street, Building #1, Suite 200, Harrisburg, PA 17110 4The Nature Conservancy, 5410 Grosvenor Lane, Ste. 100, Bethesda, MD 20814 5U.S. Army Corps of Engineers, Baltimore District, CENAB-PP-C, P.O. Box 1715 Baltimore, MD 21203 The Nature Conservancy and the Army Corps of Engineers have a strong collaboration to integrate environmental flows into reservoir operations at the project scale through the Sustainable Rivers Project. More recently, TNC-Corps teams are broadening their collaborations to the large river basin scale, where implementation must account for cumulative upstream and downstream water uses, and lead towards sustainable water management at multiple sites. The Ecological Limits of Hydrologic Alteration (ELOHA) is a new framework offering a flexible, scientifically defensible approach for assessing environmental flow needs when in-depth studies cannot be performed for all rivers in a region of interest. ELOHA builds upon the wealth of knowledge gained from decades of river-specific studies, including those implemented through SRP, and applies that knowledge to geographic areas as large as a nation, state, or major river basin. ELOHA proposes a synthesis of existing hydrologic and ecological databases from many rivers within a region to generate flow alteration-ecological response relationships for rivers with different types of hydrological regimes. These relationships correlate measures of ecological condition, which can be difficult to manage directly, to streamflow conditions, which can be more readily managed through water-use policies and practices. We will illustrate elements of the ELOHA framework through ongoing basin scale collaborative Section 729 projects in the Potomac and Susquehanna River Basins between TNC and the Corps Baltimore District. These projects, although in their early stages, provide lessons for TNC and the Corps on promising approaches to move us towards more comprehensive, sustainable water management. Ybho ! 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