<?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>R. C. Newcomb</dc:creator>
  <dc:date>1959</dc:date>
  <dc:description>&lt;p&gt;&lt;span class="EXLDetailsDisplayVal"&gt;The&amp;nbsp;&lt;span class="searchword"&gt;Columbia&lt;/span&gt;&amp;nbsp;&lt;span class="searchword"&gt;River&lt;/span&gt;&amp;nbsp;&lt;span class="searchword"&gt;basalt&lt;/span&gt;&amp;nbsp;carries&amp;nbsp;&lt;span class="searchword"&gt;ground&lt;/span&gt;&lt;span class="searchword"&gt;water&lt;/span&gt;&amp;nbsp;by percolation, largely along tabular interflow zones of variable permeability and continuity. At various places the&amp;nbsp;&lt;span class="searchword"&gt;water &lt;/span&gt;occurs under perched, unconfined, and confined conditions; at &lt;span class="searchword"&gt;some&lt;/span&gt;&amp;nbsp;places it occurs under all three conditions at different depths. Both initial and tectonic structural features, such as inclination of the flows, anticlines and synclines, and jointing and faulting, have an important bearing on occurrences of&amp;nbsp;&lt;span class="searchword"&gt;ground&lt;/span&gt;&lt;span class="searchword"&gt;water&lt;/span&gt;&amp;nbsp;in the&amp;nbsp;&lt;span class="searchword"&gt;basalt&lt;/span&gt;. Recharge of the&amp;nbsp;&lt;span class="searchword"&gt;ground&lt;/span&gt;&amp;nbsp;&lt;span class="searchword"&gt;water&lt;/span&gt;&amp;nbsp;is most effective in areas of substantial rainfall where gravel-bedded streams cross&amp;nbsp;&lt;span class="searchword"&gt;basalt&lt;/span&gt;&amp;nbsp;flows inclined at low angles. The&amp;nbsp;&lt;span class="searchword"&gt;basalt &lt;/span&gt;furnishes the main&amp;nbsp;&lt;span class="searchword"&gt;water&lt;/span&gt;&amp;nbsp;supply for domestic and public needs and a substantial part of the&amp;nbsp;&lt;span class="searchword"&gt;water&lt;/span&gt;&amp;nbsp;for irrigation and industry in the&amp;nbsp;&lt;span class="searchword"&gt;Columbia&lt;/span&gt;&amp;nbsp;Plateau region. The chemical quality of the&amp;nbsp;&lt;span class="searchword"&gt;ground&lt;/span&gt;&lt;span class="searchword"&gt;water&lt;/span&gt;&amp;nbsp;is good but varies according to the geographic and geologic occurrence of the&amp;nbsp;&lt;span class="searchword"&gt;basalt&lt;/span&gt;&amp;nbsp;rocks. The&amp;nbsp;&lt;span class="searchword"&gt;ground&lt;/span&gt;&amp;nbsp;&lt;span class="searchword"&gt;water&lt;/span&gt;&amp;nbsp;is developed by thousands of wells and springs. These fall into more or less distinct types according to their construction and the occurrence of the water. There is need for improvement in techniques of construction of wells tapping confined and perched water bodies. Continued accumulation of basic geologic information is planned to guide in further development of the ground-water resources of the basalt.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:language>en</dc:language>
  <dc:publisher>Northwest Scientific Association</dc:publisher>
  <dc:title>Some preliminary notes on the ground water in the Columbia River basalt</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>