The Conowingo Tunnel and the Anthracite Mine Flood-Control Project A Historical Perspective on a “Solution” to the Anthracite Mine Drainage Problem Michael C. Korb, P.E. Environmental Program Manager Pennsylvania Department of Environmental Protection Bureau of Abandoned Mine Reclamation (BAMR) Wilkes Barre District Office
[email protected] www.depweb.state.pa.us Abstract Fifty-seven years ago, Pennsylvania’s Anthracite Mine Drainage Commission recommended that the Conowingo Tunnel, an expensive, long-range solution to the Anthracite Mine Drainage problem, be “tabled” and that a cheaper, short-range “job- stimulus” project be implemented instead. Today Pennsylvania’s anthracite region has more than 40 major mine water discharges, which have a combined average flow of more than 285,000 gallons per minute (GPM). Two of these average more than 30,000 GPM, 10 more of the discharges are greater than 6,000 GPM, while another 15 average more than 1,000 GPM. Had the Conowingo Tunnel Project been completed, most of this Pennsylvania Anthracite mine water problem would have been Maryland’s mine water problem. Between 1944 and 1954, engineers of the US Bureau of Mines carried out a comprehensive study resulting in more than 25 publications on all aspects of the mine water problem. The engineering study resulted in a recommendation of a fantastic and impressive plan to allow the gravity drainage of most of the Pennsylvania anthracite mines into the estuary of the Susquehanna River, below Conowingo, Maryland, by driving a 137-mile main tunnel with several laterals into the four separate anthracite fields. The $280 million (1954 dollars) scheme was not executed, but rather a $17 million program of pump installations, ditch installation, stream bed improvement and targeted strip-pit backfilling was initiated.