{"id":611,"date":"2025-11-21T00:57:18","date_gmt":"2025-11-21T00:57:18","guid":{"rendered":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/?post_type=part&#038;p=611"},"modified":"2026-08-01T09:02:21","modified_gmt":"2026-08-01T09:02:21","slug":"9-transient-analytical-models-for-pumping-in-a-leaky-confined-aquifer-2","status":"publish","type":"part","link":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/part\/9-transient-analytical-models-for-pumping-in-a-leaky-confined-aquifer-2\/","title":{"raw":"9 Transient Analytical Models for Pumping in a Leaky Confined Aquifer","rendered":"9 Transient Analytical Models for Pumping in a Leaky Confined Aquifer"},"content":{"raw":"Productive hydrogeologic units that are confined by overlying semipermeable confining units or aquitards (e.g., Woessner &amp; Poeter, 2020) are often referred to as \u201cleaky confined\u201d aquifers. Gradients created by pumping can cause groundwater to leak into the confined system through the confining beds from overlying or underlying hydrogeologic units. This leakage becomes a source of some of the groundwater pumped by the well. The leakage causes the rate of drawdown in the pumping well to slow down (relative to rates predicted by the Theis equation) and potentially reach steady\u2011state conditions (if leakage rates are high enough). In addition, water released from storage in a confining bed can leak into a confined system causing the rate of drawdown in the confined unit to be less than predicted by the Theis equation. One or both conditions can occur when confining beds are permeable. Though the term leaky confined aquifer is used to describe the drawdown time response, it is the confining beds that are leaky not the principal unit being pumped.","rendered":"<p>Productive hydrogeologic units that are confined by overlying semipermeable confining units or aquitards (e.g., Woessner &amp; Poeter, 2020) are often referred to as \u201cleaky confined\u201d aquifers. Gradients created by pumping can cause groundwater to leak into the confined system through the confining beds from overlying or underlying hydrogeologic units. This leakage becomes a source of some of the groundwater pumped by the well. The leakage causes the rate of drawdown in the pumping well to slow down (relative to rates predicted by the Theis equation) and potentially reach steady\u2011state conditions (if leakage rates are high enough). In addition, water released from storage in a confining bed can leak into a confined system causing the rate of drawdown in the confined unit to be less than predicted by the Theis equation. One or both conditions can occur when confining beds are permeable. Though the term leaky confined aquifer is used to describe the drawdown time response, it is the confining beds that are leaky not the principal unit being pumped.<\/p>\n","protected":false},"parent":0,"menu_order":11,"template":"","meta":{"pb_part_invisible":false,"pb_part_invisible_string":""},"contributor":[],"license":[],"class_list":["post-611","part","type-part","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/pressbooks\/v2\/parts\/611","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/pressbooks\/v2\/parts"}],"about":[{"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/wp\/v2\/types\/part"}],"version-history":[{"count":2,"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/pressbooks\/v2\/parts\/611\/revisions"}],"predecessor-version":[{"id":2056,"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/pressbooks\/v2\/parts\/611\/revisions\/2056"}],"wp:attachment":[{"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/wp\/v2\/media?parent=611"}],"wp:term":[{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/wp\/v2\/contributor?post=611"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/books.gw-project.org\/an-introduction-to-hydraulic-testing-in-hydrogeology\/wp-json\/wp\/v2\/license?post=611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}