{"id":1295,"date":"2026-05-12T21:47:25","date_gmt":"2026-05-12T21:47:25","guid":{"rendered":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/chapter\/introduction-13\/"},"modified":"2026-05-13T03:22:43","modified_gmt":"2026-05-13T03:22:43","slug":"introduction-13","status":"publish","type":"chapter","link":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/chapter\/introduction-13\/","title":{"raw":"15.1 Introduction","rendered":"15.1 Introduction"},"content":{"raw":"<div id=\"introduction-12\" class=\"level1\">\r\n<div data-custom-style=\"First Paragraph\">\r\n\r\nIn Section\u00a05 we discussed the response of a confined aquifer to pumping from a well. To review, when a well is pumped in a confined aquifer, the pore spaces stay filled with water, and the water comes from the <em>elastic response<\/em> of the aquifer. More specifically, as pressure is reduced in the pores the pores get a little bit smaller and the overall pore volume decreases slightly. When we discussed this earlier, we did not consider the fact that changing the volume of the individual pores might change the overall volume of the aquifer.\r\n\r\n<\/div>\r\n<div data-custom-style=\"Body Text\">\r\n\r\nWell\u2026, it does change the overall volume of the aquifer. As the fluid pressure decreases, the grains expand, the pores get smaller, and the overall volume of the aquifer decreases. This is called <em>consolidation<\/em>. Just as different rocks react to tectonic stresses in different ways, different aquifers and hydrostratigraphic units react to changes in fluid pressure in different ways. Change in aquifer volume in response to change in pore fluid pressure is the subject of this section.\r\n\r\n<\/div>\r\n<\/div>","rendered":"<div id=\"introduction-12\" class=\"level1\">\n<div data-custom-style=\"First Paragraph\">\n<p>In Section\u00a05 we discussed the response of a confined aquifer to pumping from a well. To review, when a well is pumped in a confined aquifer, the pore spaces stay filled with water, and the water comes from the <em>elastic response<\/em> of the aquifer. More specifically, as pressure is reduced in the pores the pores get a little bit smaller and the overall pore volume decreases slightly. When we discussed this earlier, we did not consider the fact that changing the volume of the individual pores might change the overall volume of the aquifer.<\/p>\n<\/div>\n<div data-custom-style=\"Body Text\">\n<p>Well\u2026, it does change the overall volume of the aquifer. As the fluid pressure decreases, the grains expand, the pores get smaller, and the overall volume of the aquifer decreases. This is called <em>consolidation<\/em>. Just as different rocks react to tectonic stresses in different ways, different aquifers and hydrostratigraphic units react to changes in fluid pressure in different ways. Change in aquifer volume in response to change in pore fluid pressure is the subject of this section.<\/p>\n<\/div>\n<\/div>\n","protected":false},"author":8,"menu_order":63,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-1295","chapter","type-chapter","status-publish","hentry"],"part":1510,"_links":{"self":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters\/1295","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":2,"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters\/1295\/revisions"}],"predecessor-version":[{"id":1768,"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters\/1295\/revisions\/1768"}],"part":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/parts\/1510"}],"metadata":[{"href":"https:\/\/books.gw-project.org\/basic-hydrogeology-an-introduction-to-the-fundamentals-of-groundwater-science\/wp-json\/pressbooks\/v2\/chapters\/1295\/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=1295"}],"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=1295"},{"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=1295"},{"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=1295"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}