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Moyocoya Dam

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Moyocoya Dam
Moyocoya Dam.png
Moyocoya Dam at night
Official nameMoyocoya Dam
LocationItzatlahuitl, Xallipan
PurposePower, flood control, water storage, recreation
StatusOperational
Construction began1932
Opening date1939
(85 years ago)
 (1939)
Construction cost61 million Zacapine amatl (49 million Latin solidus) in 1932
Owner(s)Zacapine government
Operator(s)Roads, Bridges and Dams Administration
Dam and spillways
Type of damConcrete arch-gravity dam
ImpoundsYoliliz river
Height222 m (728 ft)
Length380 m (1,250 ft)
Elevation at crest377 m (1,237 ft)
Width (crest)14 m (46 ft)
Width (base)200 m (660 ft)
Dam volume2,480,000 m3 (3,240,000 cu yd)
Spillway type2 controlled drum gates
Spillway capacity11,000 m3/s (390,000 cu ft/s)
Reservoir
CreatesLake Seti
Total capacity40.500 km3 (32,834,000 acre⋅ft)
Active capacity22.346 km3 (18,116,000 acre⋅ft)
Inactive capacity18.154 km3 (14,718,000 acre⋅ft)
Catchment area500,000 km2 (190,000 sq mi)
Surface area544 km2 (210 sq mi)
Maximum length175 km (109 mi)
Maximum water depth200 m (660 ft)
Normal elevation3,280 m (10,760 ft)
Power Station
Operator(s)Electric Network Administration
Commission date1939–1960
Hydraulic head180 m (590 ft) (Max)
Turbines
  • 16 × 150 MW
  • 2 × 65 MW
  • 2 × 4 MW
Installed capacity2,538 MW
Capacity factor29%
Annual generation6.4 TWh (23 PJ) (2022)

The Moyocoya Dam is a hydroelectric Arch-gravity dam in the Itzatlahuitl section of the Yoliliz river in the Xallipan Republic of Zacapican. Built between 1932 and 1939, the Moyocoya Dam was the last of the great Xolotecatl era megaprojects to be completed as it was finished almost a full year after the assassination of Xolotecatl Acuixoc in 1938. The dam was proposed by the Public Works Secretary, Achto Moyocoya, who championed the project and rallied political support to push through the many hurtles the dam would face before and during construction. The project would come to bear Secretary Moyocoya's name as a result of his vigorous advocacy. Moyocoya Dam claimed the record of the tallest dam in the world and the largest by internal volume at the time of its completion in 1939, and remains the largest and tallest dam in Zacapican. The dam is widely regarded as a great feat of engineering and an important landmark of northern Zacapican, making it a popular tourist destination as well as a functional piece of infrastructure.

The dam sits just 40 kilometers from the center of Tzopilopan, a city of 1.7 million and the capital of Xallipan. The electricity generated by the dam's 20 turbines is primarily directed towards Tzopilopan and its suburbs, and has served as the main supply of electric power in the region since the turbine halls began operating in 1939, two weeks after the completion of the dam's construction. The reservoir created by the Moyocoya Dam, known as Lake Seti, represents the largest body of water in the arid Xallipan region of the country. This water is not only piped to Tzopilopan and the other settlements of the region for the personal consumption and use of its citizens, but also represents the lifeblood of the region's agriculture and local food supply. The Yoliliz river which the Moyocoya dams is naturally temperamental, prone to heavy seasonal flooding as well as major fluctuations in flow throughout the year. The dam not only provides a means of flood control, protecting the downstream agricultural communities from the summer snowmelt flooding, but also retains water from the summer floods for use in Xallipan during the dry months from April to October when the river runs at a much lower flow level and recedes within its banks.