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Most regulatory authorities in the United States that offer requirements for flood openings define two major classes of opening: [1] engineered, and non-engineered. The requirements for non-engineered openings are typically stricter, defining necessary characteristics for aspects ranging from overall size of each opening, to allowable screening or other coverage options, to number and ...
26 square miles (67 km 2) Santa Rosa Dam (National ID # NM00158) is a dam in Guadalupe County, New Mexico . The earthen dam was constructed by the United States Army Corps of Engineers , with a height of 214 feet (65 m) and 1,900 feet (580 m) long at its crest. [ 1 ]
Built primarily for flood control, the lake surface is kept at an elevation of 1,396 feet (426 m) above sea level for recreation during the summer. During the fall, the lake is lowered 16 feet (4.9 m) to hold additional water from winter and spring runoff. When flooding occurs, the gates in the intake structure are closed to the minimum level.
The dam is 225 feet (69 m) high and 612 feet (187 m) long, holding 858 acre-feet (1,058,000 m 3) of water with a maximum capacity of 1,028 acre⋅ft (1,268,000 m 3). The catchment area for the dam is 10.8 square miles (28 km 2). The dam was built between 1923 and 1927. [1] The dam has three valves that control releases of stormwater. [2]
A catchment area of 3,120 square miles (8,100 km 2) lies above the dam site. [4] At full pool, the reservoir has a capacity of 468,585 acre-feet (0.577991 km 3), with a surface area of 12,150 acres (4,920 ha). [4] Normal conservation water levels are much lower, at 81,443 acre-feet (0.100458 km 3). [2]
The reservoir has a conservation storage capacity of 138,761 acre-feet (0.171159 km 3), with an extra 56,740 acre-feet (0.06999 km 3) of surcharge, flood-control storage. Flood water releases are controlled by a spillway with five radial gates, which can pass up to 247,000 cu ft/s (7,000 m 3 /s).
A flood is an overflow ... from about 50 to 1,500 cubic feet per second (1.4 ... factor for watersheds of less than approximately 30 square miles or 80 square ...
The 2019 opening began February 27, 2019, [5] when river levels were predicted to rise to minor flood stage in New Orleans on March 19, 2019. The Army Corps of Engineers initially opened 38 of the 350 bays and increased this number to 206 bays when the flood crest arrived later in March.