{"id":70,"date":"2015-02-03T15:34:42","date_gmt":"2015-02-03T23:34:42","guid":{"rendered":"http:\/\/research.engineering.ucdavis.edu\/gpa\/?page_id=70"},"modified":"2015-05-11T14:50:52","modified_gmt":"2015-05-11T22:50:52","slug":"horizontal-drains","status":"publish","type":"page","link":"https:\/\/research.engineering.ucdavis.edu\/gpa\/erosion-piping\/horizontal-drains\/","title":{"rendered":"Horizontal Drains"},"content":{"rendered":"<hr \/>\n<p>Hillsides can be stabilized by installing \u201chorizontal drains\u201d in the slope to draw down the water table and reduce pore water pressures. Though they are called \u201chorizontal drains,\u201d the drains are usually installed at a slight upward angle, to facilitate drainage. They are usually 200 feet to 300 feet in length, and cost about $10 per foot installed.<\/p>\n<div id=\"attachment_1001\" style=\"width: 498px\" class=\"wp-caption alignleft\"><a href=\"http:\/\/research.engineering.ucdavis.edu\/gpa\/wp-content\/uploads\/sites\/43\/2015\/02\/Drilling-Horizontal-Drains-P01-Thumbnail.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1001\" class=\" wp-image-1001\" src=\"http:\/\/research.engineering.ucdavis.edu\/gpa\/wp-content\/uploads\/sites\/43\/2015\/02\/Drilling-Horizontal-Drains-P01-Thumbnail.jpg\" alt=\"This photo shows a drill rig installing a horizontal drain at La Esperanza Dam in Ecuador. A hole is drilled about 300 feet into the slope using a hollow-stem auger. Then a perforated PVC pipe is inserted into the hollow stem of the auger, and is held in place as the auger is removed. With this powerful drill rig, a 300 foot long drain hole could be drilled into the shale that formed the hillside in about 15 minutes.\" width=\"488\" height=\"326\" srcset=\"https:\/\/research.engineering.ucdavis.edu\/gpa\/wp-content\/uploads\/sites\/43\/2015\/02\/Drilling-Horizontal-Drains-P01-Thumbnail.jpg 223w, https:\/\/research.engineering.ucdavis.edu\/gpa\/wp-content\/uploads\/sites\/43\/2015\/02\/Drilling-Horizontal-Drains-P01-Thumbnail-150x100.jpg 150w\" sizes=\"auto, (max-width: 488px) 100vw, 488px\" \/><\/a><p id=\"caption-attachment-1001\" class=\"wp-caption-text\">This photo shows a drill rig installing a horizontal drain at La Esperanza Dam in Ecuador. A hole is drilled about 300 feet into the slope using a hollow-stem auger. Then a perforated PVC pipe is inserted into the hollow stem of the auger, and is held in place as the auger is removed. With this powerful drill rig, a 300 foot long drain hole could be drilled into the shale that formed the hillside in about 15 minutes.<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Hillsides can be stabilized by installing \u201chorizontal drains\u201d in the slope to draw down the water table and reduce pore water pressures. Though they are called \u201chorizontal drains,\u201d the drains are usually installed at a slight upward angle, to facilitate drainage. They are usually 200 feet to 300 feet in  \u2026 <a href=\"https:\/\/research.engineering.ucdavis.edu\/gpa\/erosion-piping\/horizontal-drains\/\"> Continue reading <span class=\"meta-nav\">&rarr; <\/span><\/a><\/p>\n","protected":false},"author":69,"featured_media":0,"parent":32,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ngg_post_thumbnail":0,"footnotes":""},"class_list":["post-70","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/research.engineering.ucdavis.edu\/gpa\/wp-json\/wp\/v2\/pages\/70","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/research.engineering.ucdavis.edu\/gpa\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/research.engineering.ucdavis.edu\/gpa\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/research.engineering.ucdavis.edu\/gpa\/wp-json\/wp\/v2\/users\/69"}],"replies":[{"embeddable":true,"href":"https:\/\/research.engineering.ucdavis.edu\/gpa\/wp-json\/wp\/v2\/comments?post=70"}],"version-history":[{"count":2,"href":"https:\/\/research.engineering.ucdavis.edu\/gpa\/wp-json\/wp\/v2\/pages\/70\/revisions"}],"predecessor-version":[{"id":1043,"href":"https:\/\/research.engineering.ucdavis.edu\/gpa\/wp-json\/wp\/v2\/pages\/70\/revisions\/1043"}],"up":[{"embeddable":true,"href":"https:\/\/research.engineering.ucdavis.edu\/gpa\/wp-json\/wp\/v2\/pages\/32"}],"wp:attachment":[{"href":"https:\/\/research.engineering.ucdavis.edu\/gpa\/wp-json\/wp\/v2\/media?parent=70"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}