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Between 1915 and 1983, an estimated 81 million acre feet of groundwater was pumped in the vicinity of Phoenix, to complement surface water from the Salt River, Verde River and Agua Fria River. In urban areas, groundwater is now mainly recharged from excess irrigation, urban surface runoff, canal seepage and years of higher than average rainfall ...
Arizona is also one of the Four Corners states and is diagonally adjacent to Colorado. Arizona has a total area of 113,998 square miles (295,253 km 2), making it the sixth largest U.S. state. [1] Of this area, just 0.3% consists of water, which makes Arizona the state with the second lowest percentage of water area (New Mexico is the lowest at ...
Plant community composition can change dramatically over a gradient of groundwater depth: plants that can only survive in wetland conditions can be replaced by plants that are tolerant of drier conditions as groundwater levels are reduced, causing habitat community shifts and in some cases complete loss of riparian species. [7]
In the aquifer, groundwater flows from points of higher pressure to points of lower pressure, and the direction of groundwater flow typically has both a horizontal and a vertical component. The slope of the water table is known as the “hydraulic gradient”, which depends on the rate at which water is added to and removed from the aquifer and ...
On May 27, 2011, a U.S. District judge ruled that Fort Huachaca's plan to pump 6,100 acre-feet (7,500,000 m 3) of groundwater without mitigation plans to replenish the San Pedro River flows failed to protect the endangered Southwestern willow flycatcher (Empidonax traillii) and the Huachuca water umbel so they could recover from their imperiled ...
Teravalis, formerly known as Douglas Ranch, is in a legal dispute with the Arizona Department of Water Resources over groundwater rights. Buckeye's master-planned Teravalis, once Douglas Ranch, in ...
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The Santa Cruz River east of Nogales just after re-entering the United States from Mexico. The Santa Cruz has its headwaters in the high intermontane grasslands of the San Rafael Valley to the southeast of Patagonia, Arizona, between the Canelo Hills to the east and the Patagonia Mountains to the west, just north of the international border.