The scandal concerns contracts for the Lesotho Highlands Water Project, a dam construction venture which has been partly funded by the World Bank.
It will take strong institutions at both the national and international levels to satisfy competing demands and defuse tension when it arises, such as over proposals for shale gas extraction, mass irrigation or dam construction.
In Nagano, Mr Tanaka won with the support of citizens' groups that opposed a dam the construction ministry wanted built against the wishes of local residents.
"The dam's construction benefits riparian countries, showcases fair and equitable use of the river's flow and does not cause any harm on any country, " Alemayehu Tegenu said.
It would involve the construction of a dam, reservoir, underground power station and water tunnels in the hills above Loch Lochy.
Environmental groups warned that the construction of the dam would likely lead the to the extinction of several fresh water fish species.
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The "People of the Springs" exhibit traces the city's obscure history, from Native American dwellings to the arrival of the railroad on the Western frontier and the construction of Hoover Dam.
The young star of The Rocket, Sitthiphon Disamoe, stars as Aholo - a boy who enters a traditional rocket festival to help save his poverty-stricken family who have been uprooted for the construction of a dam.
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Under the Ghandi style leadership of an extraordinary woman the people who live on the banks of the Narmada river in India have managed to halt the construction of a dam that threatens to destroy their way of life.
The first phase of the project has been completed with the construction of the Katse dam in Lesotho.
The construction of the Gezhouba dam in 1981 on the Yangtze river also created a barrier to the migrating fish which further affected fish stocks.
In the past week the president (and former general), Thein Sein, has announced that construction of the Myitsone dam across the River Irrawaddy would cease.
The infamous snail-darter, a three-inch fish that held up for years the construction of a federal dam in Tennessee, has happily survived the dam's arrival.
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After a referendum in Tokushima in which the locals voted against a new dam, the mayor, a construction-ministry old boy, abandoned his support for the project.
For thousands of years, the sitting figure of Ramses II watched over the Nil, till the construction of the Aswan dam threatened to drown the ancient temple under the waters of the river.
Before the construction of the Pak Moon dam in Ubon Ratchathani province, Thailand, the waterway contained over 250 species of fish.
But back in 1963, while the reservoir dam in Cwm Tryweryn was still under construction, it was the actions of three young men that were making the headlines.
Voters in Tokushima, on the island of Shikoku, are fighting construction-ministry bureaucrats over a new dam for the nearby Yoshino river.
Angelei is fighting to stop the construction of what would be the fourth largest dam in the world, the Gibe 3, which would destroy the lake.
To the north, hopes are pinned to the construction of a 12km (7.4 mile) dam between the two sections of the sea.
Nearly all of the native tribes in the region are against the dam, though no tribes will have to relocate because of its construction.
The Aswan high dam, for example, is often cited as a cautionary example, a quixotic construction that now reduces the mighty Nile to a dribble before it trickles to the sea, leaving behind an explosion of water hyacinth, outbreaks of bilharzia, polluted irrigation channels and a build-up of sediment inland that would otherwise compensate for coastal erosion from Egypt to Lebanon.
"The dam is being built in the middle of the river so you can't carry out construction work while the river flowed, " Mihret Debebe, chief executive officer of the state-run Ethiopian Electric Power Corporation, told the Reuters news agency.
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