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Geology & Groundwater Flow Concepts, and Source Water Protection Areas to
Public-Supply Wells
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Surficial Geology in Rhode Island
Sediments of Glacial Origin (Till Deposits and Stratified Deposits) Overlie Bedrock
Modeling Example
Geology Focus
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Geology – Wood River Valley
Till Deposits
Stratified Deposits
Bedrock
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Glacial Stratified Deposits Laid Down by Meltwater in Morphosequences
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Glacial Stratified Deposits Laid Down by Meltwater in Morphosequences (Westerly)
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Valley Section Showing Hydrologic Cycle and Groundwater-Flow Paths
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Definition of Area Contributing Recharge to Pumped Well
Cross Section
Map View
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Location of Workshop
Model Representation of Hunt River and Adjacent River Basins
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Model Design Map View of Model Grid
Section Showing Model Layers
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Model Calibration
Groundwater Levels and Streamflows Used in Model Calibration
Simulated Water Table Contours
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Contributing Areas for Average Annual Pumping Rate
DRAFT
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Contributing Areas for Maximum Pumping Rates (Maximum-Rated Capacity of Pump)
DRAFT
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Groundwater Travel Times
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Groundwater Travel Times from the Water Table to the Well
Well Center Summary Range: less than one month to more than 350 years Median: 4 to 5 years Percentage 10 years or less : 80 to 90 percent
DRAFT
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Selected Urban and Agricultural Land Uses