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GIS User for Countywide Groundwater Assessment, Jefferson County, WV
 

GIS User for Countywide Groundwater Assessment, Jefferson County, WV

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Preseneted at EPAN 2012 meeting in August 2012

Preseneted at EPAN 2012 meeting in August 2012

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    GIS User for Countywide Groundwater Assessment, Jefferson County, WV GIS User for Countywide Groundwater Assessment, Jefferson County, WV Presentation Transcript

    • County-wideGroundwater AssessmentJefferson County,West Virginia
    • Objective Assess availability and quality of groundwater and provide useful information toward promoting long- term management of the County’s Groundwater Resources
    • Groundwater Budget Study Focused on identifying the extent of the County’s groundwater resources  Groundwater recharge  Groundwater usage  Maintenance of baseflow in streams
    • RechargeGroundwater originates as precipitation The portion of precipitation that percolates downward through the soil and infiltrates into the bedrock aquifer is called Recharge:
    • Recharge Calculation Recharge Area (green) Discharge Area (red) Previously published recharge rates were applied to County’s total recharge area to determine Annual Recharge Volume
    • Recharge Rates Hydrogeologic Unit Recharge Rate Recharge Area (inches/year) (acres) Western 5.9 36,734 Central 5.6 70,684 Eastern 5.5 12,331 *recharge rates are representative of drought conditions
    • Maintenance of Baseflow Utilized published data from similar hydrogeologic setting to estimate percentage of annual recharge contributing to baseflow An estimated 50% of annual recharge is required to maintain baseflow in streams and is unavailable for use
    • Annual Recharge EstimateRecharge from precipitation: 18,475,000,000 gallons/yearVol. needed to maintain baseflow: - 9,237,500,000 gallonsVol. of groundwateravailable for use: 9,237,500,000 gallons
    • Groundwater UsageConsidered the following use categories:  Public Supply  Irrigation  Domestic Supply  Commercial  Industrial  Mining
    • Groundwater Use Estimate 1,465,250,000 gallons per year Sources of water use information: Data Management Unit of the Engineering Division,  2010 U.S. Census Data Jefferson County Office of Environmental Health  West Virginia Office of Miners’ Health, Safety and WV Dept. of Environmental Protection, Division of Training Water and Waste Management  Water-Use Estimates for West Virginia, Atkins, 2004 – WVU Agricultural Extension Service – Jefferson USGS publication County Office
    • Groundwater Use EstimatePercentage of available groundwater used annually: 1.47 bgy Groundwater use estimate:Groundwater deemed available: 9.24 bgy 16%
    • Groundwater Well Database Assistance provided by the Jefferson County GIS Department Utilized available well completion reports from Health Department Database consists of over 1100 wells with georeferenced locations
    • Internship• Worked for Jefferson County GIS/Addressing Office• Water budget study• Analytical Services Inc.
    • The Effect of Bedrock Geology onWell Yield in Jefferson County, West Virginia Jeremiah Sanders Shepherd University
    • My Study• Focus on geology• How geology affect well yield• Null Hypothesis: There is no difference in the distribution of well yield between the bedrock formations
    • Methods• Well database• Clean up database• Create parcel ID
    • Methods• Importing to ArcGIS• 1276 parcel match• Quality assessment
    • Methods• Create new database• New field entries• Examined well completion reports• Inconsistent entries in well completion reports
    • Methods• Join new database to parcels/address Points• 911 well points
    • Methods• State well records and USGS study (McCoy et al. 2005) wells added• Total 1124 well points• Joined bedrock data to well points• Used SPSS 19(IBM, USA) to check for normality and K-W test
    • Results (Єa)-Antietam Formation 300 (Єe)- Elbrook Formation (Єh)-Harpers Formation 250 (Єt)-Tomstown Formation (Єw)-Waynesboro Formation 200 (Єwl)-Weverton and# of Wells Loudoun Formations undivided 150 (OЄc)- Conococheague Limestone 100 (Om)-Martinsburg Formation 50 (Omu)-Middle Ordivician limestone (Opr)-Pinesburg Station 0 Dolomite and Rockdale Run Formation Єa Єe Єh Єt Єw Єwl OЄc Om Omu Opr Os Zc (Os)- Stonehenge Limestone Bedrock Formation (Zc)-Catoctin Formation
    • Results (Єa)-Antietam Formation 180 (Єe)- Elbrook Formation 160 (Єh)-Harpers Formation 140 (Єt)-Tomstown FormationAverage Yield (lpm) (Єw)-Waynesboro Formation 120 (Єwl)-Weverton and 100 Loudoun Formations undivided 80 (OЄc)- Conococheague Limestone 60 (Om)-Martinsburg Formation 40 (Omu)-Middle Ordivician 20 limestone (Opr)-Pinesburg Station 0 Dolomite and Rockdale Run Єa Єe Єh Єt Єw Єwl OЄc Om Omu Opr Os Zc Formation (Os)- Stonehenge Limestone Bedrock Formation (Zc)-Catoctin Formation
    • Hydrogeologic UnitsAreas possessing unique characteristics Western Fault Dominated Central Folded Carbonates Eastern Metamorphics
    • Table of Mean ValuesReview of well database illustrates uniqueness of eachHydrogeologic Unit: Hydrogeologic Well Depth Yield Depth to Water Casing Length Unit (feet) (gpm) (feet) (feet) Western 281 19 46 57 Central 278 32 66 74 Eastern 355 14 94 83
    • Groundwater DevelopmentPotentialThe Central Unit has thegreatest number of highyielding wells Yield (gpm)
    • Hydrogeologic Conditions VaryAcross County Site-specific assessment is recommended to understand compatibility of groundwater development with planned use
    • Water Quality ReviewCommon Groundwater Contaminants: Hydrogeologic Unit Common Contaminants Western Sulfate, Nitrate, Bacteria, Hardness Central Nitrate, Bacteria, Hardness Eastern Iron, Manganese, Radionuclides
    • Contaminant MigrationInfluenced by geologic conditions and land use  Conduits in Karst areas can facilitate direct groundwater contamination and rapid contaminant transport
    • RecommendationsTo promote sustainability and long-term protection ofthe County’s groundwater resources, ASI recommends:  Assessment of High-Yield withdrawals  Incorporating Groundwater Protection into long-term planning