Geology & Groundwater Flow Concepts, and Source Water Protection Areas to

Public-Supply Wells

Surficial Geology in Rhode Island

Sediments of Glacial Origin (Till Deposits and Stratified Deposits) Overlie Bedrock

Modeling Example

Geology Focus

Geology – Wood River Valley

Till Deposits

Stratified Deposits

Bedrock

Glacial Stratified Deposits Laid Down by Meltwater in Morphosequences

Glacial Stratified Deposits Laid Down by Meltwater in Morphosequences (Westerly)

Valley Section Showing Hydrologic Cycle and Groundwater-Flow Paths

Definition of Area Contributing Recharge to Pumped Well

Cross Section

Map View

Location of Workshop

Model Representation of Hunt River and Adjacent River Basins

Model Design Map View of Model Grid

Section Showing Model Layers

Model Calibration

Groundwater Levels and Streamflows Used in Model Calibration

Simulated Water Table Contours

Contributing Areas for Average Annual Pumping Rate

DRAFT

Contributing Areas for Maximum Pumping Rates (Maximum-Rated Capacity of Pump)

DRAFT

Groundwater Travel Times

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

Selected Urban and Agricultural Land Uses