Volume and extent of the Deepwater Horizon oil spill Volume and extent of the Deepwater Horizon oil spill The "Deepwater Horizon" oil spill was discovered on the afternoon of 22 April 2010 when a large oil slick began to spread at the former rig site. According to the Flow Rate Technical Group, the leak amounted to about of oil, exceeding the 1989 "Exxon Valdez" oil spill as the largest ever to originate in U.S.-controlled waters and the 1979 Ixtoc I oil spill as the largest spill in the Gulf of Mexico. BP has challenged this calculation saying that it is overestimated as it includes over of oil which was
Oil spill governance in the United States that it makes it a mandatory requirement for U.S. tank vessels, onshore and offshore facilities to establish and submit oil spill response plans to the corresponding federal authority. The OPA requires new vessels operating and transporting oil in U.S. waters to have double hulls. Not all vessels are of the same size and for the same purpose hence the OPA makes provision for exempting certain vessels from having double hulls. However, by 2015 it is a requirement by law that all oil carrying vessels operating in the U.S. must have double hulls. The legal framework for enforcing oil spill governance