For the siphons to work though (to fully drain it) you need lower ground to siphon to than what the lower pond level is. Might be tough in a quarry hole.
Kind of depends on how much money you are willing to invest. But one quicker solution is find a large industrial pump like would have been used in the mine to keep it dry. Big Diesel engine and six or eight inch centrifugal pump. Or a farmer that you could hire with a tractor and pto irrigation pump.
Then you could get it pumped down within a day. Three inch trash pump likely would be at it the better part of a week for 9 acres. Siphon would be great if you can find low enough surrounding area to siphon to. Or even if you could get it half way siphoned down, then trash pump.
Just some different ideas you can entertain.
Edit: If it is ground source water, a 3" pump might do no more than take out what is running in at the bottom.
Last edited by snrub; 01/10/15 08:47 AM.
