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About 855 Phase I MS4s and 6,695 Phase II MS4s are regulated by the permit system, as of 2018. The MS4s serve over 80% of the US population and provide drainage for 4% of the land area. [33] Most construction sites are covered by general permits. Other industrial sites that only discharge stormwater are typically covered by general permits. [34]
When it comes to stormwater ... 59.5 million acre-feet of stormwater go uncaptured across the United States — or roughly 53 billion gallons per day. The amount is equivalent to 93% of the water ...
In the United States, governments have taken a number of legal and regulatory approaches to controlling NPS effluent. Nonpoint water pollution sources include, for example, leakage from underground storage tanks, storm water runoff, atmospheric deposition of contaminants, and golf course, agricultural, and forestry runoff.
Topsoil runoff from farm, central Iowa (2011). Water pollution in the United States is a growing problem that became critical in the 19th century with the development of mechanized agriculture, mining, and manufacturing industries—although laws and regulations introduced in the late 20th century have improved water quality in many water bodies. [1]
Stormwater permit regulations issued by the United States Environmental Protection Agency (EPA) govern the permit process. [4] EPA published its "Phase I" stormwater rule, which covers industrial dischargers, in 1990. [5] Most stormwater permits in the U.S. are issued by the agencies in 47 states that have been given authority by EPA.
Stormwater, also written storm water, is water that originates from precipitation , including heavy rain and meltwater from hail and snow. Stormwater can soak into the soil ( infiltrate ) and become groundwater , be stored on depressed land surface in ponds and puddles , evaporate back into the atmosphere, or contribute to surface runoff .
As stormwater is channeled into storm drains and surface waters, the natural sediment load discharged to receiving waters decreases, but the water flow and velocity increases. In fact, the impervious cover in a typical city creates five times the runoff of a typical woodland of the same size.
The American economy expanded at a healthy 2.8% annual pace from July through September on strong consumer spending and a surge in exports, the government said Wednesday, leaving unchanged its ...