He tried to improve their space by building a dam.
He has plans to build 77 dams on the river.
The plan to build a dam first appeared in 1931.
That investment would be 60 times better than building a dam.
We have built large dams to hold back water in a lake.
Construction started in 1927 to build a dam across the river to store water.
They built a dam in the river and started several factories.
That was before some guys came along and built a huge dam to block most of the water.
That is like waiting for a flood before building a dam.
To build a dam, they look at a mountain, move it down into the valley.
