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No. An aqueduct is built to transport water.
*Niagara
If you mean "Why does the water from the supply pipe stop flowing?" it is best to check with your local water supply utility company. Maybe they are doing some maintenance work on their water distribution network?
It won't stop suddenly, but will reduce the flow so you get less and less water.
To help protect against bomb blasts.
When it is blocked by an insulator or if your in the North Pole
When you stop breathing.
The Itaiupu Dam was made to stop the water from flowing. The other reason was to lower the risk of a flood.
stop
You cant!
It'll stop flowing when all of the material has reached th same temperature.
Put a block of anything into the hole that the lava is coming out of and it will stop. Works with water falls also.