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July Water Conditions Continue Normal in Maryland, Delaware, and D.C. - Streamflow and Groundwater Levels High at Month's End

U.S. Department of the Interior
U.S. Geological Survey

Wendy McPherson (
Maryland-Delaware-D.C. Water Science Center
5522 Research Park Drive
Baltimore, MD 21228
FAX: (443)498-5510

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Updated: August 7 , 2000

Streamflow and Groundwater levels at the end of July in the Maryland-Delaware-DC region were generally in the upper part of the normal range, according to hydrologists at the U.S. Geological Survey (USGS) in Baltimore, Maryland. The average streamflow for several key sites in July 2000 ranged from 92 to 240 percent of the long-term average discharge for July.

The average streamflow into the Chesapeake Bay during July 2000 was 22 billion gallons per day, which is about the long-term average for July and 2.6 times greater than July 1999. Together, the Susquehanna and Potomac Rivers at their outlets discharged 10.3 and 4.0 billion gallons per day, respectively, which provided 65 percent of the total streamflow discharging to the Chesapeake Bay during July 2000. Streamflow during July at the Potomac River near Washington, D.C., averaged 2.8 billion gallons per day, which is about normal for July. Throughout most of Maryland, streamflow decreased during July, but remained within the normal range. Streamflow increased on the Eastern Shore and in Delaware in July, and moved from within the normal range to above the normal range.

Groundwater levels at the end of July decreased throughout the area but generally remained in the normal to above-normal range throughout the entire bistate area. Monthly updates of Groundwater conditions for 32 key observation wells that encompass all counties of Maryland and Delaware may be found at Water storage in the Baltimore reservoir system decreased slightly during July to 69.75 billion gallons (92 percent of capacity).

As the nation's largest water, earth and biological science, and civilian mapping agency, the USGS works in cooperation with more than 2,000 organizations across the country to provide reliable, impartial scientific information to resource managers, planners, and other customers. This information is gathered in every state by USGS scientists to minimize the loss of life and property from natural disasters, contribute to the sound conservation and the economic and physical development of the nation's natural resources, and enhance the quality of life by monitoring water, biological, energy, and mineral resources.

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