<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Carol L. Luukkonen</dc:creator>
  <dc:date>2018</dc:date>
  <dc:description>&lt;p&gt;As part of local wellhead protection area programs, areas&lt;br&gt;contributing water to production wells need to be periodically&lt;br&gt;updated because groundwater-flow paths depend in part on&lt;br&gt;the stresses to the groundwater-flow system. A steady-state&lt;br&gt;groundwater-flow model that was constructed in 2009 was&lt;br&gt;updated to reflect recent (2017) pumping conditions in the&lt;br&gt;Lansing and East Lansing area in the Tri-County region, Michigan.&lt;br&gt;For this current (2017) study, withdrawals from selected&lt;br&gt;production wells were updated, and the existing model calibration&lt;br&gt;under the new pumping conditions was checked. Results&lt;br&gt;of flow simulations indicate that 10-year time-of-travel areas&lt;br&gt;cover approximately 25 square miles and 40-year time-oftravel&lt;br&gt;areas cover approximately 51 square miles.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3133/ofr20181133</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>U.S. Geological Survey</dc:publisher>
  <dc:title>Delineation of contributing areas for 2017 pumping conditions to selected wells in Ingham County, Michigan</dc:title>
  <dc:type>reports</dc:type>
</oai_dc:dc>