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The powerhouse is 761 feet (232 m) long, 148 feet (45 m) high, 62 feet (19 m) wide and located 1,080 feet (330 m) underground. The two tailrace tunnels are 1691.64 m long. The net head is 312.42 m. Kannagawa Hydropower Plant is a pumped-storage hydroelectric power plant near Minamiaiki in Nagano Prefecture and Ueno in Gunma Prefecture, Japan ...
Water discharged from Plant 1, at a rate of up to 700 cu ft/s (20 m 3 /s), is returned to the river below the falls via a 650 ft (200 m) long tailrace tunnel. [12] [16] [17] The intake for Plant 2 is located near the right abutment of the weir. Water first enters a tunnel along a ridge which parallels the river downstream of the falls.
The race bringing water from the mill pond to the water wheel is a headrace; the one carrying water after it has left the wheel is commonly referred to as a tailrace. [ 1 ] Waterwheels were used for various purposes from things such as agriculture to metallurgy in ancient civilizations spanning the Hellenistic Greek world , Rome , China and India .
Two tailrace tunnels take the water that passes through the power station to Deep Cove, a branch of Doubtful Sound, 10 kilometres (6.2 mi) away. Access to the power station is via a two-kilometre vehicle-access tunnel which spirals down from the surface, or a lift that drops 193 metres (633 ft) down from the control room above the lake.
Manapouri Power Station – Machine hall 111 m long, 18 m wide, 34 m high, and road access tunnel 2040 m long, 6.7 m wide and high, with a semi-circular arch roof.; Manapouri Tailrace – 2 tunnels – original tailrace tunnel 9817 m long, 9.2 m diameter horseshoe section, commenced 1964, breakthrough 1968 drill-and-blast construction, 16 deaths.
The catchment basin of the source, especially the Bambarabatu Oya sub-catchment, experiences some of the highest and most consistent rainfall in Sri Lanka. In total, the plant has a catchment area of 172.58km2. The project comprises a diversion weir, intake, headrace channel, forebay, penstocks, powerhouse, tailrace, and switchyard.
Water released from the power station is returned to the Tana via a 1.4 km (0.87 mi) long tailrace tunnel. The difference in elevation between the reservoir and power station affords a hydraulic head of 150.5 m (494 ft). [4] [5]
The plant's maximum output capacity is nominally 300 MW, generated by six 25 MW Pelton turbines and a 150 MW pumped storage generator added in 1997. In 2014 two 10 kW microturbine units were added to generate further power from the tailrace after the main turbines.