Causes and risk factors of Barrett's esophagus As with most diseases and conditions, there are certain groups of people who are at a higher risk of developing Barrett's esophagus. GERD is a condition that is closely linked to Barrett's esophagus.
Potomac River â Map & Details. print this map. Located along the mid-Atlantic coast of the United States, and flowing into the Chesapeake Bay, the Potomac River flows through Washington DC, Virginia, Maryland, Pennsylvania and West Virginia.
The Potomac River basin study will focus on the freshwater part of the river upstream from Indian Head, Md. The average flow of the Potomac near Washington, D.C., is 7,440 million gallons per day for the period 1930-89.he Potomac River basin is underlain by many different types of rocks. The rocks in the mountainous Appalachian Plateaus and Valley and Ridge provinces are sedimentary (sandstones, shales, and limestones). The mountainous Blue Ridge and rolling Piedmont provinces are underlain mostly by crystalline rocks.