In LDOCE:

Ditch is: a long narrow hole dug at the side of a field, road etc to hold or remove unwanted water.

Trench is: a long narrow hole dug into the surface of the ground.

But the difference still a bit vage. Would you help me out to make it clear?
Original Post
One important difference is that a trench can be much deeper than a ditch, which tends to be relatively shallow.

For example, as already cited, a farmer will dig a ditch to catch an overflow of rain water and carry the water away safely. Egyptologists dig trenches, sometimes deep ones, when looking for undiscovered ancient tombs.

Richard

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