How do they make dams?

Question

how do they do it with all that water there

Answer 1

Your detail asks a different question than your primary and since there are about 9 different kinds of dams and 9 or more uses, there could be lots of answers.

  The general answer is that dams are made by blocking the flow of water in a place where the sides are higher on both sides and it is done either by pouring a lot of concrete or by piling dirt over a core that blocks leakage.

  The water is retained for flood control, for irrigation, for recreation (boating, swimming), for scenery and investment (lakeside homes), for deeper water for transportation, for drinking during droughts, and for generating power.  Generally, any one dam will have more than one purpose and almost none will have all that are listed.

Answer 2

Just a guess, may be the dam's constructed when the river's running low of water. may be in summer.

It takes a lot of scientists, engineers to design a dam construction, and it is done in a large scale, they did plan out something. I searched all over the net and dint find the answer! sorry!

Answer 3

they divert the river upstream of the dam.

close to where I live there is a dam, and they actually drilled a tunnel through a mountain and diverted the river throught the tunnel. they then constructed the dam and when it was complete, they blocked the tunnel.