{"id":1169,"date":"2026-05-12T21:46:30","date_gmt":"2026-05-12T21:46:30","guid":{"rendered":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/chapter\/introduction-7\/"},"modified":"2026-05-13T16:28:49","modified_gmt":"2026-05-13T16:28:49","slug":"introduction-7","status":"publish","type":"chapter","link":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/chapter\/introduction-7\/","title":{"raw":"8.1 Introduction","rendered":"8.1 Introduction"},"content":{"raw":"<div id=\"introduction-6\" class=\"level1\">\r\n<div data-custom-style=\"First Paragraph\">\r\n\r\nSection 7 discusses the radial flow of water to a well and introduces the Theis equation. We show how, given a transmissivity and storativity, the Theis equation can be used to calculate the amount of drawdown that would occur in the aquifer at some distance from a well (pumping at a constant rate) after some period. The Theis equation, however, is more commonly used to do the opposite\u2014that is, to use drawdown data from a pumped well to estimate transmissivity and storativity of the formation. This section focuses on <em>aquifer tests<\/em><sup>4<\/sup>: tests that involve pumping from a well, measuring drawdown in the aquifer during pumping, then using those data and the Theis equation to estimate aquifer parameters.\r\n\r\n<\/div>\r\n<\/div>\r\n<div class=\"footnotes footnotes-end-of-document\">\r\n\r\n<hr \/>\r\n\r\n<div class=\"bc-aside aside\" role=\"doc-footnote\">\r\n<div data-custom-style=\"Footnote Text\">\r\n\r\n<sup>4<\/sup> It is acceptable to refer to these types of tests as <em>aquifer test<\/em>, <em>hydraulic test<\/em>, or <em>pumping test<\/em>. It is not, however, appropriate to use the term <em>pump test<\/em>, as that implies that one is testing the <em>pump<\/em> rather than the <em>aquifer<\/em>.\r\n\r\n<\/div>\r\n<\/div>\r\n<\/div>","rendered":"<div id=\"introduction-6\" class=\"level1\">\n<div data-custom-style=\"First Paragraph\">\n<p>Section 7 discusses the radial flow of water to a well and introduces the Theis equation. We show how, given a transmissivity and storativity, the Theis equation can be used to calculate the amount of drawdown that would occur in the aquifer at some distance from a well (pumping at a constant rate) after some period. The Theis equation, however, is more commonly used to do the opposite\u2014that is, to use drawdown data from a pumped well to estimate transmissivity and storativity of the formation. This section focuses on <em>aquifer tests<\/em><sup>4<\/sup>: tests that involve pumping from a well, measuring drawdown in the aquifer during pumping, then using those data and the Theis equation to estimate aquifer parameters.<\/p>\n<\/div>\n<\/div>\n<div class=\"footnotes footnotes-end-of-document\">\n<hr \/>\n<div class=\"bc-aside aside\" role=\"doc-footnote\">\n<div data-custom-style=\"Footnote Text\">\n<p><sup>4<\/sup> It is acceptable to refer to these types of tests as <em>aquifer test<\/em>, <em>hydraulic test<\/em>, or <em>pumping test<\/em>. It is not, however, appropriate to use the term <em>pump test<\/em>, as that implies that one is testing the <em>pump<\/em> rather than the <em>aquifer<\/em>.<\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"author":8,"menu_order":24,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-1169","chapter","type-chapter","status-publish","hentry"],"part":1489,"_links":{"self":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters\/1169","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/wp\/v2\/users\/8"}],"version-history":[{"count":3,"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters\/1169\/revisions"}],"predecessor-version":[{"id":1858,"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters\/1169\/revisions\/1858"}],"part":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/parts\/1489"}],"metadata":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters\/1169\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/wp\/v2\/media?parent=1169"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapter-type?post=1169"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/wp\/v2\/contributor?post=1169"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/wp\/v2\/license?post=1169"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}