Soil Mechanics and Foundation
If the water table rises upto ground surface, then the

effective stress is reduced due to increase in pore water pressure only but total stress does not change
total stress is reduced due to increase in pore water pressure only but effective stress does not change
effective stress is reduced due to decrease in total stress only but pore water pressure does not change
total stress is increased due to decrease in pore water pressure but effective stress does not change

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Soil Mechanics and Foundation
With the increase in the amount of compaction energy

optimum water content decreases but maximum dry density increases
both optimum water content and maximum dry density decrease[ES 93]
both optimum water content and maximum dry density increase
optimum water content increases but maximum dry density decreases

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