Answer:
the thickness of the dam should be the same if the level of water does not change.
Explanation:
the thickness of dam depends on the pressure of water that has to withstand.
Since the pressure exerted by the water depends only on the depth of the lake and not the length of the lake
P =1/2 *ρ*g*h ,
where P= pressure exerted by the water on the dam, ρ= density of water , g= gravity , h= depth of the lake
Then if the lake were smaller and the depth remains the same, the thickness of the dam should be the same
