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The zoned earth embankment creates a 204 acres (83 ha) reservoir and at normal pool stores 3,130 acre-feet (3,860,000 m 3) of water. A normal pool elevation of 1,495.3 feet (455.8 m) is maintained throughout the year via the principal and auxiliary spillways. The zoned earth fill dam is 39 feet (12 m) in height and 530 feet (160 m) long.
The New Waddell Dam is 300 ft (91 m) high from the riverbed and 440 feet (130 m) high from its bedrock foundation. It is a zoned earth-fill type and is 4,700 ft (1,433 m) long; containing 16,200,000 cu yd (12,385,789 m 3) of material. The dam has a crest width of 35 feet (11 m) and a base width of 1,514 feet (461 m). [4]
Modern zoned-earth embankments employ filter and drain zones to collect and remove seep water and preserve the integrity of the downstream shell zone. An outdated method of zoned earth dam construction used a hydraulic fill to produce a watertight core. Rolled-earth dams may also employ a watertight facing or core in the manner of a rock-fill dam.
The construction of the canal head works began in March 1948, and was completed a year later. Designed as a zoned earth embankment structure with an impervious central core, a semi-pervious layer on either side of the core, and a layer of rock fill. The semi-pervious layer was built in 1 foot (0.30 m) layers and compacted.
The following table lists the largest man-made dams by volume of fill/structure. By general definition, a dam is a barrier that impounds water or underground streams, hence tailings dams are relegated to a separate list. Data on volume of structure is not as easily available or reliable as data on dam height and reservoir volume.
Name State(s) Height Type River Coordinates Built ft m; Oroville Dam [1] CA 770.5 234.8 Embankment Feather River: 1968 Hoover Dam [2] AZ NV 726 221 Arch-gravity dam
The dam is of zoned earthen construction and has a structural height of 92 feet (28 m), standing 87 feet (27 m) above the riverbed. It is one of the largest dams by volume in the United States, containing more than 12,000,000 cubic yards (9,200,000 m 3 ) of material in an embankment more than four miles long.
The embankment section extends from the end of the concrete gravity portion 3,937.008 ft (1,200.000 m) across the valley to the right abutment. It has a maximum height of 213.2546 ft (65.0000 m) above the top of rock. The non-zoned embankment is composed of well-compacted, low plasticity clays, from the valley alluvium. [6]