{"id":514,"date":"2011-06-16T10:23:06","date_gmt":"2011-06-16T10:23:06","guid":{"rendered":"http:\/\/www.esearing.com\/pond\/?p=514"},"modified":"2011-06-16T10:24:24","modified_gmt":"2011-06-16T10:24:24","slug":"gravity-flow-of-pipes","status":"publish","type":"post","link":"https:\/\/www.esearing.com\/pond\/2011\/06\/gravity-flow-of-pipes\/","title":{"rendered":"Gravity flow of pipes"},"content":{"rendered":"<p>I am planning a new filter for the pond and I looked up the gravity discharge of pipes to make sure I don&#8217;t over run the filter. Knowing my pump outputs 3500 GPH on low speed and 7000+ GPH on high speed, under pressure through 2&#8243; pipe,  I need an outlet that will be greater than 8000 GPH. Below is a chart. Notice that 2 2&#8243; pipes is less flow than 1 3&#8243; pipe. It is simple math really, remember basic geometry? Volume of a cylinder is<br \/>\n<a href=\"http:\/\/www.esearing.com\/pond\/wp-content\/uploads\/2011\/06\/cylinder.gif\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.esearing.com\/pond\/wp-content\/uploads\/2011\/06\/cylinder.gif\" alt=\"Volume of a cylinder\" title=\"Volume of a cylinder\" width=\"59\" height=\"20\" class=\"alignnone size-full wp-image-519\" \/><\/a>. Lets look at standard US PVC pipe sizes with a height of 1 inch. <\/p>\n<table>\n<tr>\n<td>Diameter<\/td>\n<td>GPH<\/td>\n<td>Volume cu in.<\/td>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>960<\/td>\n<td>0.79<\/td>\n<\/tr>\n<tr>\n<td>1.5<\/td>\n<td>2,100<\/td>\n<td>1.77<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>3,300<\/td>\n<td>3.14<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>8,400<\/td>\n<td>7.07<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>14,400<\/td>\n<td>12.56<\/td>\n<\/tr>\n<\/table>\n<p>1 cubic inches = 0.004329 US gallons<br \/>\nSo a 2&#8243; diameter pipe has<br \/>\n<center>3.14 cu.in.\/seconds(roughly) x 216,000 seconds\/hr x .004329 gal = 2936 GPH<\/center><br \/>\nAdd in the force of gravity, friction, and the weight of water and you can get close to the GPH value.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I am planning a new filter for the pond and I looked up the gravity discharge of pipes to make sure I don&#8217;t over run the filter. Knowing my pump outputs 3500 GPH on low speed and 7000+ GPH on &hellip; <a href=\"https:\/\/www.esearing.com\/pond\/2011\/06\/gravity-flow-of-pipes\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,8,9],"tags":[],"class_list":["post-514","post","type-post","status-publish","format-standard","hentry","category-pond-building","category-resources","category-wandering"],"_links":{"self":[{"href":"https:\/\/www.esearing.com\/pond\/wp-json\/wp\/v2\/posts\/514","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.esearing.com\/pond\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.esearing.com\/pond\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.esearing.com\/pond\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.esearing.com\/pond\/wp-json\/wp\/v2\/comments?post=514"}],"version-history":[{"count":9,"href":"https:\/\/www.esearing.com\/pond\/wp-json\/wp\/v2\/posts\/514\/revisions"}],"predecessor-version":[{"id":523,"href":"https:\/\/www.esearing.com\/pond\/wp-json\/wp\/v2\/posts\/514\/revisions\/523"}],"wp:attachment":[{"href":"https:\/\/www.esearing.com\/pond\/wp-json\/wp\/v2\/media?parent=514"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.esearing.com\/pond\/wp-json\/wp\/v2\/categories?post=514"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.esearing.com\/pond\/wp-json\/wp\/v2\/tags?post=514"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}