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Difficult Run is a 15.9-mile-long (25.6 km) [1] tributary stream of the Potomac River in Northern Virginia in the United States. [2]The stream is part of a 57.7-square-mile drainage basin, or watershed, in the north-central portion of Fairfax County, Virginia.
The Piedmont region of Virginia is a part of the greater Piedmont physiographic region which stretches from the falls of the Potomac, Rappahannock, and James Rivers to the Blue Ridge Mountains. The region runs across the middle of the state from north to south, expanding outward to a width of nearly 190 miles at the border with North Carolina .
This is a list of Superfund sites in Virginia designated under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) environmental law.The CERCLA federal law of 1980 authorized the United States Environmental Protection Agency (EPA) to create a list of polluted locations requiring a long-term response to clean up hazardous material contaminations. [1]
A city and county that share a name may be completely unrelated in geography. For example, Richmond County is nowhere near the City of Richmond, and Franklin County is even farther from the City of Franklin. More Virginia counties are named for women than in any other state. [4] Virginia's postal abbreviation is VA and its FIPS state code is 51.
Surface runoff (also known as overland flow or terrestrial runoff) is the unconfined flow of water over the ground surface, in contrast to channel runoff (or stream flow).It occurs when excess rainwater, stormwater, meltwater, or other sources, can no longer sufficiently rapidly infiltrate in the soil.
Eroding soils or poorly maintained construction sites can often lead to increased sedimentation in runoff. Sedimentation often settles to the bottom of water bodies and can directly affect water quality. Excessive levels of sediment in water bodies can increase the risk of infection and disease through high levels of nutrients present in the soil.
Wetlands are characterized by water-logged soils and distinctive communities of plant and animal species that have adapted to the constant presence of water. This high level of water saturation creates conditions conducive to methane production. Most methanogenesis, or methane production, occurs in oxygen-poor environments.
Built in 1840, the plantation was purchased in 1843 by Edmund Ruffin, a Virginia planter and a pioneer in agricultural improvements; he also published an agricultural journal in the 1840s named the Farmer's Register.