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APPALACHIAN PLATEAUS GROUNDWATER AVAILABILITY the U.S

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APPALACHIAN PLATEAUS GROUNDWATER AVAILABILITY the U.S APPALACHIAN PLATEAUS GROUNDWATER AVAILABILITY The U.S. Geological Survey’s Groundwater Resources Program is conducting an assessment of groundwater availability throughout the United States to gain a better understanding of the status of the Nation’s groundwa- ter resources and how changes in land use, water use, and climate may affect those resources. The goal of this National assessment is to improve our ability to forecast water availability for future economic and environmen- tal uses. Assessments will be completed for the Nation’s principal aquifer systems to help characterize how much water is currently available, how water availability is changing, and how much water we can expect to have in the future (Reilly and others, 2008). Why a regional groundwater study? Appalachian Plateaus aquifers occupy approximately Groundwater withdrawals from Appalachian Plateaus 86,000 mi2 in portions of Alabama, Kentucky, Maryland, aquifers are small when compared to the billions of gallons Ohio, Pennsylvania, Tennessee , Virginia, and West withdrawn daily from more prolific aquifers of the United Virginia (fig. 1). Appalachian Plateaus aquifers are com- States (Reilly and others, 2008). As a result, few studies prised of alternating sequences of fractured sandstone, have focused on groundwater availability in Appalachian siltstone, shale, limestone, and coal in Permian-, Pennsylva- Plateaus aquifers at regional-scales consistent with (1) nian-, and Mississippian-age rock formations. Erosion of Appalachian Basin energy resource assessments (ie. the rock formations has produced the characteristic steep Kirschbaum and others, 2012), or (2) State and Federal hills, rugged topography, and deeply incised valleys that are regulatory frameworks. home to approximately 2.2 million rural residents with- drawing a total of 156 million gallons per day (Mgal/d) of The Appalachian Plateaus Groundwater Availability study potable water from domestic wells and 1.8 million residents is intended to provide the foundational groundwater-related receiving 289 Mgal/d of groundwater from public supplies datasets for other Federal and State water-resource investi- (Kenny and others, 2009). The remaining 8.1 million gations to assess drinking-water resources, aquatic ecosys- residents rely on 1.2 billion gallons per day (Bgal/d) of tems, and continued energy resource development in the surface water for potable water supply, which, in many region. A better understanding of groundwater availability cases depends on groundwater contributions as base flow to in the Appalachian Plateaus thus plays a central role in streams. sustained economic development of the region. What is groundwater availability? The concept of groundwater availability is more than just how much water can be pumped from any given aquifer. Groundwa- ter availability is a function of many factors, including the quantity and quality of water and the laws, regulations, economics, and environmental factors that control its use. The primary objective of the Appalachian Plateaus groundwater availability study is to identify spatial and temporal changes in the overall water budget by more fully determin- ing the natural and human processes that control how water enters, moves through, Active groundwater flow in Appalachian Plateaus aquifers occurs within a few hundred and leaves the groundwater system. feet of the land surface where a local framework of stress-relief fracture and bedding- plane permeability is constrained near valley walls and under valley bottoms. Springs in valley walls discharge from stress-relief fractures at sandstone outcrops. Photo by USGS hydrologist Mark Kozar U.S. Department of the Interior Info Sheet U.S. Geological Survey 2014 Major components of the study (VWDEOLVKLQJDUHJLRQDOK\GURJHR- ORJLFIUDPHZRUN A hydrogeologic framework of the Plateaus aquifers inclusive of stress-relief fractures, regional structures, vast areas of underground coal workings, and areas of extensive karst development is needed to evaluate regional heterogeneities in context of regional water budgets and flow patterns. A regional hydrogeologic framework can be directly inferred from published geologic cross sections, isopach Fracture pathways seated in valley bottoms serve as routes of groundwater flow where regional joints sets (as shown above) and stress-relief fracturing are superimposed on the hydrostrati- maps, coal-mine mapping efforts, and graphic framework. Photo by USGS hydrologist Mark Kozar. digital datasets from the National Coal Resources Data System (http://ncrdspublic.er.usgs.gov/nflap/). 21 in/yr (Mohamoud, 2004) to 29 in/yr (Zuwarksi, 1978). Long-term historic recharge to Appalachian The Appalachian Plateaus groundwater availability Plateaus aquifers typically ranges from 6 to 18 in/yr study will incorporate surficial mapping with these (Reese and Risser, 2010; Dumouchelle and Schiefer, sources of subsurface data in the development of a 2002; Zurawski, 1978). Recharge to Appalachian three-dimensional model of bedrock aquifers. Plateau aquifers is approximated by base flow because most streams in the Appalachian Plateaus &RPSXWLQJ(VWLPDWHVRI+\GURORJLF%XGJHW are gaining streams, the water table is relatively shallow, and losses of groundwater from riparian Precipitation falling on the Plateaus is ultimately evapotranspiration and consumptive withdrawals consumed by evapotranspiration, groundwater are considered to be small. recharge, and runoff to streams. Direct runoff to streams accounts for 17 to 20 percent of annual Recharge, evapotranspiration, and runoff during precipitation in the Appalachian Plateaus (Zurawski, 1980-2010 will be estimated by the Soil-Water- 1978). Evapotranspiration accounts for an estimated Balance (SWB) method (Westenbroek and others, 2010), which is based on a modified version of the Thornthwaite-Mather equations and can be discretized at sub-watershed scales. 'HILQLQJWKH/DUJHVW)ORZ6\VWHPRI5HO- HYDQFH Groundwater flow in Appalachian Plateaus aquifers is characterized by short flow paths, typically extending no more than tens of miles. Groundwater flow is controlled both by the regional dip of bed- rock, local topography, and distal hydrologic bound- aries coincident with large river valleys (Carswell and Bennett, 1963). A refined conceptual model of the Recharge occurs primarily in topographically high areas (ridges) and flows groundwater-flow system in the Appalachian laterally and downward through shallow fractures in the bedrock . Aquifers discharge to local streams and rivers where aquatic ecosystems within the Plateaus will further the understanding of a locally Plateaus rely on sustained base flow from groundwater. Photograph by Gary driven groundwater-flow system in the context of Hartley, National Park Service hydrostratigraphy developed at the regional scale. Previous Work Karst in the Appalachian Plateaus Regional assessments of groundwater resources in Mississippian-age aquifers consist of sandstone, the Tennessee River (Zurawski, 1978) and Ohio River limestone, and fractured chert. Limestone content Basins (Bloyd, 1974) were undertaken to show the increases to the south where in Kentucky, Virginia, need for management of groundwater resources in and West Virginia, the Greenbrier Limestone and regional water-supply planning. These assessments Slade Formation discharge 1,000 gal/m or more to described groundwater occurrence, water budgets, springs. Large spring discharges from the and development potential of aquifers in the Mississippian-age carbonate aquifers along the sides Plateaus and adjacent physiographic provinces. of major incised valleys such as the Sequatchie Valley in Tennessee yield as much as 4,000 gal/m from the Seaber and others Bangor and (1988) described the 85° 80° 75° Tuscumbia Lime- dominant geologic 45° stones (Miller, 1990). LAKE ONTARIO Syracuse controls on ground- Rochester water flow in the Buffalo NEW YORK Dissolution of Plateaus, including StudyMICHIGANMIC areaHIGAN Mississippian-age Zurawski’s (1978) aquifers has resulted DeDDetroitetroite Erie conceptual model of LAKELA ERIE in the development of the Cumberland Cleveland locally permeable PENNSYLVANIA Akron Plateau in Tennessee Harrisburg karst features (Seaber NEW JERSEY and Wyrick and Pittsburgh and others, 1988). Borchers (1981) OHIO DELAWARE Caves, sinkholes, and Columbus model of stress-relief MARYLAND sinking streams are Washington fracturing in south- 40° INDIANA prevalent in the Cincinnati ern West Virginia. WEST VIRGINIA extensive Charleston Mississippian-age Coal Hydrology Frankfort VIRGINIA karst aquifers of southeastern West The USGS Coal KENTUCKY Virginia and eastern Hydrology Program Winston-Salem Kentucky. In West in the late 1970s and NORTH CAROLINA Virginia alone, there early 1980s provided EXPLANATION Aquifer TENNESSEE ChCharlotte are over 3,000 docu- a broad characteriza- Permian-age aquifers Pennsylvanian-age aquifers mented caves in tion of the hydrol- Chattanooga Mississippian-age aquifers Mississippian-age ogy and energy 35° Huntsville units (Dasher, 2012). production in the SOUTH CAROLINACAROLINA Cave passages tend to Plateaus as it related ALABAMA Atlanta 0 100 200 MILES Birmingham be constrained by to coal extraction in GEORGIA 0 100 200 KILOMETERS Base from U.S. Geological Survey digital data stress-relief fracturing 23 areas of the Albers Equal Area Conic Projection, NAD83 within valley walls in eastern coal prov- Figure 1. Location of Permian-age, Pennsylvanian-age, and Mississippian-age “Cumberland Style” ince. aquifers of the Appalachian
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