|
Difficult Run is a 〔U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. (The National Map ), accessed August 15, 2011〕 tributary stream of the Potomac River in northern Virginia in the United States.〔(Map of the watershed of Difficult Run )〕 The stream is named not for the nature of the stream's rapids themselves; rather, long-boatmen in the time of the Patowmack Company found the two sharp bends of the Potomac near Difficult Run's mouth treacherous. Difficult Run flows through Fairfax County to Great Falls Park, on the Virginia side of the Potomac River. The portion of the run through the park has been characterized as "a miniature Mather Gorge and Great Falls."〔(The Difficult Run Trail, with NPS map of the run and the trail )〕 In the Great Falls area the run is relatively flat and wide at the top of the trail with calm waters, like the Potomac River above Great Falls. The stream picks up speed as it narrows into a steep gorge with waterfalls and quickly reaches the same level as the Potomac. At the mouth of Difficult Run, one can see a panoramic view of the Potomac River. ==Watershed== The Difficult Run watershed is the largest in Fairfax County at .〔According to Fairfax County GIS data April 2007〕 The following subwatersheds make up the Difficult Run Watershed: * Captain Hickory Run * Piney Run * Colvin Run * Snakeden Branch * Little Difficult Run * Rocky Run * Angelico Branch * Piney Branch * Wolftrap Creek * Rocky Branch * Lower Difficult Run * Sharpers Run * Middle Difficult Run * Upper Difficult Run * South Fork Run * The Glade * Old Courthouse Spring Branch * Dog Run〔(Difficult Run Watershed Planning Project, Fairfax County, Virginia )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Difficult Run」の詳細全文を読む スポンサード リンク
|
