The U.S. Army Corps of Engineers (USACE), The Nature Conservancy (TNC), and the Interstate Commission on the Potomac River Basin (ICPRB) are collaborating on a 3-year project, the "Middle Potomac River Watershed Assessment," to quantify Potomac watershed environmentally sustainable flows -- flows that sustain healthy river ecosystems and the goods and services that humans derive from them.
Learn more about the Middle Potomac River Watershed Assessment here.
News, Events, and Documents
Nov. 29-30, 2011.
Oct. 27, 2011. From Science to Management Applications, are now available for download. This webinar began with a quick review of flow alteration - ecological response relationships being developed for this project and then reviewed how similar relationships were developed and applied to water resources management in Michigan and Massachusetts. The examples from these two states provide some context with which to begin considering how flow alteration - ecological response relationships might be used for management in the Potomac basin.Slides from the Oct. 27 2011 webinar,
Sept. 8, 2011. Quantitative Flow-Ecology Relationships, Part 2, are now available for download. The webinar reviewed key points about sources and methods used to develop component data for flow alteration - ecology relationship plots, showed results of tests done to verify flow model performance, showed how flow alteration - ecology plots are generated, and showed an example interpretation.Slides from the Sep. 8 2011 webinar,
July 15, 2011. Slides from the July 15th "Quantitative Flow-Ecology Relationships, Part 1" webinar are now available for download. The webinar focused on the variables and data sets being assembled to create flow alteration – ecological response relationships and the methodologies to be used to test those relationships.
June 16, 2011. Slides from the June 16th "Modeling Streamflows" webinar
May 13, 2011. The Potomac Basin Large River Environmental Flow Needs report has been completed (click link to download, 10.5 MB). In the report, the hydrologic needs of key flow-dependent species and communities in four segments of the mainstem Potomac and two selected large tributaries are identified using a modification of the Ecologically Sustainable Water Management approach. Draft findings were presented at a September 2010 workshop (see September 22-23, 2010 News entry below) and this final report incorporates input provided by workshop participants. Included in the report also are recommendations for additional research, monitoring, and analysis to fill current information gaps and better define acceptable thresholds of hydrologic alteration from current conditions. The report's Executive Summary only ( 0.2 MB) also is available.
May 13, 2011. Slides from the May 10 Human uses of water: current and future demands and impacts on flows webinar are now available. This webinar provided estimates of future (to 2030) human demand for water in the Potomac basin and describes how the project team made those estimates. Those demand projections will be used later in this project to estimate changes to stream flow under various scenarios for future conditions.
April 15, 2011. The April 12 webinar “Middle Potomac Watershed Assessment: Technical Overview” can be downloaded here. This is the first webinar in the six part series described in the March 3, 2011 News entry below, this one providing an introduction to the methodology being used for all steps in the project. An audio recording of the webinar, on CD, is available upon request.
April 15, 2011. The March 15 webinar “Middle Potomac Watershed Assessment: Applications for jurisdiction water use decision making” can be downloaded here. This webinar provides a project introduction as well as a conceptual framework for how the results of this project can be applied to basin-wide water resources management. An audio recording of the webinar, on CD, is available upon request.
March 3, 2011. Announcing a series of six webinars that will explain the technical basis for defining environmentally sustainable flows for streams and wadeable rivers in the Potomac basin. In addition, a date has been selected for the project's final workshop at which the project's technical findings will be evaluated in a management context. Information about registering to participate in the webinars and in the workshop is forthcoming.
- Apr 12, 2011. Webinar 1: Overview of Potomac environmental flows project goals, outcomes, benefits, and audiences
- May 10, 2011. Webinar 2: Human uses of water: current and future demands and impacts on flows
- Jun 16, 2011. Webinar 3: Modeling stream flows: explanation of models and scenarios, and descriptive statistics for simulated flow scenarios
- Jul 14, 2011. Webinar 4: Developing flow alteration-ecological response relationships: Part 1: Data, variables, and methodology
- Sep 8, 2011. Webinar 5: Developing flow alteration-ecological response relationships: Part 2: What the relationships look like, dealing with data ambiguities, and interpretation
- Oct. 27, 2011. Webinar 6: From science to management implications: Preparing for the Nov. 29-Dec. 1, 2011 expert workshop, objectives and process.
- Nov. 29-Dec. 1, 2011. Streams and Wadeable Rivers Environmental Flows Workshop at NCTC, Shepherdstown, WV. Participants will review ELOHA curves developed by this project and make recommendations regarding the limits to flow alteration to protect stream biota. More information about this workshop is forthcoming.
February 25, 2011. Factsheet about the Middle Potomac River Watershed Assessment . Download factsheet here.
February 10, 2011. Potomac Basin Large River Environmental Flow Needs final report completed. This report will be available for download after approval by the National Park Service.
September 22-23, 2010. A two-day expert workshop to define environmental flow needs for the mainstem Potomac River below Harper's Ferry, and the mainstem Monocacy River and Opequon Creek, and the freshwater portion of the tidal Potomac. Participants in this workshop worked to establish a hydrological baseline for the Potomac allowing for ecological considerations to be built into long-term water and land use planning decisions. Download workshop presentations and draft summary report here.
September 9, 2010. Introductory webinar for Potomac Basin Large River Environmental Flow Needs Workshop. Download presentation here.
August 24, 2010. Draft report, Potomac Basin Large River Environmental Flow Needs, released which compiles the results of a draft assessment of flow needs and flow recommendations and which will be reviewed at the September 22-23, 2010 Environmental Flow Needs workshop. Download a copy of the full report (9.5 MB), here. Download just the Executive Summary (0.5 MB), here.
September 29, 2009. Middle Potomac RIver Watershed Assessment Kick-Off Webinar. Download presentation here.