Physics
The wall of a dam is broader at the base

To withstand pressure that is increased with atmospheric pressure
To withstand pressure that increases with depth
To withstand pressure that increases in a horizontal plane
Because streamlining is required

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Physics
Siphon will fail to work if:

The temperature of the liquids in the two vessels are the same.
Both its limbs are of unequal length.
The level of the liquid in the two vessels are at the same height.
The densities of the liquid in the two vessels are equal.

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