That's not good. Draining swamps/wetlands is not prudent long-run. Studies have been done in several coal states ( Pa. one of them ) that showed the best way to mitigate coal-mine acid seepage and improve ground water quality is to INSTALL new swamps. Areas that HAD natural swamps and had them drained & removed/filled in, had a real problem with mine acid polluting surface AND groundwater. After several universities and engineering firms studied ways to alleviate surface water & groundwater pollution by the mine acid, they concluded swamps were the answer. After big $$$ studies and more $$$ to BUILD new swamps, water testing proved swamps clean the water of ALL KINDS of pollutants ( mine acid, toxic chemicals, pesticides, etc. ). It has something to do with native plants that grow in wetlands filter out dangerous pollutants as part of their life processes.
I saw a documentary on T.V. where a coal mine operator was BUILDING a new swamp to clean the run-off water from his mine property. The swamp, even with the $$$ spent to install it, was the cheapest way to clean the run-off from acid. Far cheaper than the chemical treatments he had been buying. The question asked at the end of the documentary was " could swamps be the answer to groundwater pollution around the country? " Could it be the Good Lord had it right in the first place???
Like you said, all kinds of wildlife love a wetland. Glad you have some at your place.