{"id":507,"date":"2018-05-08T22:06:38","date_gmt":"2018-05-08T22:06:38","guid":{"rendered":"https:\/\/learn.hydrologystudio.com\/studio-express\/?post_type=ht_kb&#038;p=507"},"modified":"2022-02-08T22:12:49","modified_gmt":"2022-02-08T22:12:49","slug":"orifices","status":"publish","type":"ht_kb","link":"https:\/\/learn.hydrologystudio.com\/studio-express\/knowledge-base\/orifices\/","title":{"rendered":"Orifice Flow Calculations"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Circular &amp; Rectangular<\/h2>\n\n\n\n<p>Studio Express uses the standard orifice equation for Circular and Rectangular orifices.<\/p>\n\n\n\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-651\" src=\"https:\/\/learn.hydrologystudio.com\/stormwater-studio\/wp-content\/uploads\/sites\/3\/2017\/10\/EqGrateInSag1.png\" alt=\"\" width=\"134\" height=\"39\"><br>Where:<br>Co = 0.60 (or as set in Settings)<br>Ag = clear opening area in sqft (sqm)<br>g = 32.16 (9.8) gravity<br>d = head as measured from the centroid in ft (m)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-375\" src=\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/OrificeDiagram.png\" alt=\"Orifice equation\" width=\"854\" height=\"434\" srcset=\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/OrificeDiagram.png 854w, https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/OrificeDiagram-300x152.png 300w, https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/OrificeDiagram-768x390.png 768w, https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/OrificeDiagram-50x25.png 50w, https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/OrificeDiagram-60x30.png 60w, https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/OrificeDiagram-100x51.png 100w\" sizes=\"auto, (max-width: 854px) 100vw, 854px\" \/>Orifice Plates<\/h2>\n\n\n\n<p>This is a special kind of orifice structure as shown below which contains a series of same-sized holes all within a vertical height.<\/p>\n\n\n\n<figure class=\"wp-block-image is-style-default\"><img loading=\"lazy\" decoding=\"async\" width=\"261\" height=\"182\" src=\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/PlateOrifice.png\" alt=\"Orifice Plate\" class=\"wp-image-535\" srcset=\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/PlateOrifice.png 261w, https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/PlateOrifice-50x35.png 50w, https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/PlateOrifice-60x42.png 60w, https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/PlateOrifice-100x70.png 100w\" sizes=\"auto, (max-width: 261px) 100vw, 261px\" \/><\/figure>\n\n\n\n<p>The following formula by McEnroe, 1988 is used to estimate the outflow.<\/p>\n\n\n\n<figure class=\"wp-block-image is-style-default\"><img decoding=\"async\" src=\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/11\/EqPerf.png\" alt=\"\" class=\"wp-image-833\"\/><\/figure>\n\n\n\n<p>Where:<br>Q = discharge in cfs (cms)<br>Cp = 0.61<br>A = cross-sectional area of all the holes, sqft (sqm)<br>Hs = height in ft (m)<br>H = distance between water surface and the Invert Elevation in ft (m)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Circular, Rectangular and Perforated Plates<\/p>\n","protected":false},"author":1,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[31],"ht-kb-tag":[],"class_list":["post-507","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-computational-methods"],"_links":{"self":[{"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/ht-kb\/507","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/comments?post=507"}],"version-history":[{"count":7,"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/ht-kb\/507\/revisions"}],"predecessor-version":[{"id":863,"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/ht-kb\/507\/revisions\/863"}],"wp:attachment":[{"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/media?parent=507"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/ht-kb-category?post=507"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/ht-kb-tag?post=507"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}