When a dam is to be built, a diversion tunnel is usually bored through solid rock next to the dam site to byPAss the dam construction site. The dam is built while the river flows through the diversion tunnel.
590,000
625,000
6% off
1,499
2,499
40% off
590,000
625,000
6% off
5.0
590,000
0.0
5.0
5.0
4.5
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