page_title: Yeywa Dam
section_title: Design
hierarchical_section_title: Yeywa Dam / Design
caption_attribution_description: English: The four generators of yeywa dam
context_page_description: The Yeywa Hydropower Station, located on the Myitnge River, 52 kilometres southeast of Mandalay city, at Yeywa village in Kyaukse Township, Mandalay Region in central Myanmar, is the country's first roller-compacted concrete dam, and the site of a 790-megawatt hydroelectric power plant, the largest in the country.
context_section_description: The dam design comprises a 137 metres (449 ft) high RCC embankment gravity dam, built of 2,800,000 cubic metres (99,000,000 cu ft) of concrete. The dam includes an ungated spillway of reinforced conventional concrete cast after RCC placement, located in the central section of the dam for a design flood water discharge of 6,600 cubic metres per second (230,000 cu ft/s). The 448-foot (137 m) wide spillway consists of eight 56-foot (17 m) wide and 39-foot (12 m) high outlets.
  There is a 790 MW (4 × 197.5 MW) powerhouse at the toe of the dam on the south bank of the river. The power house containing the turbines and generators is 510 feet (160 m) long, 148 feet (45 m) wide and 197 feet (60 m) high. The power house and dam structures are designed to withstand earthquakes of up to eight on the Richter scale.
  
  The power generation facilities consist of four water intakes, each consisting of 22-foot (6.7 m) diameter and 492-foot (150 m) long high tensile steel pipe penstocks and four vertical axis Francis turbines and generator units and associated electro-mechanical and auxiliary equipment installed in an open air powerhouse. Four water intake towers were built as conventional reinforced concrete structures abutting the upstream (east) face of the RCC dam. This enabled the contractor to build the towers above the penstock inlets before the start of RCC construction in order to minimise interference with the RCC construction activity.
  There is one permanent 10-metre (33 ft) diameter, 450-metre (1,480 ft) long, diversion tunnel in the north river bank serving as a bottom outlet. This outlet tunnel enables reservoir drawdown and control during reservoir filling, maintenance of downstream riparian river flow during the impounding period and, together with the spillway, serves to redirect flood waters of the Myitnge river and maintain river flow during an emergency when all turbines are closed down.
  Two double circuit 230 kV transmission lines connect the main transformers located on the downstream side of the powerhouse to an open-air switchyard, located on the south river bank 550 metres (1,800 ft) downstream of the powerhouse.  The Yeywa Dam will supply electric power to the Meiktila Sub-Power Station through the 110 kilometres (68 mi) long Yeywa-Meiktila 230 kV double power line link to the southwest and to the Bellin Substation through another 50 kilometres (31 mi) long 230 kV double power line link in the west. The Bellin and the Meiktila Sub-Power Stations will be linked to each other with 100 km long 23 kV double power lines. US$45.8 million worth of 230 KVA cables and equipment were used for construction and linking of these sub- power stations.
caption: Inside the generation house
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