Let players drain the marshes!

[dazhat]

I suggest we are allowed to drain marshes by having our colonists dig a trench from the marsh to the sea or large body of water. If digging a trench to a lake then it would have to be at least twice as big as the marsh to absorb it.

The marsh would drain slowly leaving behind tiles which could be built on or farmed. The trench which drained the marsh would remain full of water like a stream. The trench would slowly become blocked (by sediment brought from land being drained). The colony could prevent it becoming blocked by clearing the trench with colonists. If the trench were ever blocked, the marsh would return which would kill any crops growing and seriously damage any equipment which the colony had built there.

What do people think?