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This will operate the pumps just to the north which will pump water out of the moat and into the main cistern.
If the cistern is open to the river then the water will flow away once the cistern is full.
The pumps don't seem to be much good though - the moat water is sluggish and perhaps malachite wasn't the best material to build one of the pumps out of.
Obviously closing the Moat-River floodgate first would be a good idea if you want to drain the moat! -
Kazindir