Water Lakes

  WATER LAKES

1. How do locks work ?

 Locks on canals allow boats to travel inland waters by helping them adjust to differences in elevation from one body of water to another.

The Erie Canal , a 363-mile-long wonder, was completed by human and horsepower in 1825.It linked the Hudson River at Albany with lake Erie at Buffalo ----a rise of 568 feet---improving commerce and facilitating westward settlement in the growing US.

On the Erie Canal , a boat approaching a lock was pulled in by a mule on the twopath and the downstream water gate was the closed. Sulices in the upstream gate allowed the lock's water level to rise.

When the water "topped out" the upstream gate was opened and the mule was allowed to pull the boat through. Today , boats "lock through" on their own power but the principle is the same .

2.How do Dams Work?

A Dam is a structure built across a river to control its flow. Sometimes  a reservoir or lake is created behind the dam and can be used for recreation . Water flow controlled by a dam may be used to supply the water to nears by communities , to power a hydroelectric plant , or to irrigate crops.

Dams can be built in different designs and of different materials such as earth, rock or concrete. Most large dams are made of concrete. They are often designed to arch toward the incoming flow of water , a designed that provides additional strength and distributes the weight of water to the ends of dam.

Dams typically have a value built in to allow operators to release excess water form the upstream side. They also have spillways to release large amount of water in order to prevent unwanted flooding.

BONUS  FACT :

                                PANCH  POKHRI-----FOUND AT 17,758 FEET ON MOUNT EVEREST----IS THE HIGHEST NAMED LAKE IN THE WORLD.

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