Dewatering of an excavation, as described in this text, can be done by the
A) sump method.
B) well-point method.
C) pit method and sump method.
D) sump method and well-point method.

The correct answer is option D) sump method and well-point method.

Explanation:

When carrying out an excavation, you must be very careful with the water that runs under the earth that is close to the land that is going to be excavated.

That is why dewatering is made.

Ways of extracting this water can be a sump method and well-point method.

The sump method involves collecting all the water in a well within the excavation and then draining it with a handling pump.

Wellpoint on the other hand, is more common in shallow excavations where small wells are made that are connected with a tube and draw the water.

Given this information we can say that the correct answer is option D.