![\"\"](\"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-content\/uploads\/sites\/5\/2017\/10\/EqBroadWeir.jpg\")
<\/p>\nWeir flow is automatically computed for Inline Weir sections. The program employs the standard weir equation as described below. If the weir structure width (b) is less than the one-half the flow depth (H), it is considered a sharp crested weir. Otherwise, it’s treated as a broad crested weir.<\/p>\n
<\/p>\n
Where:<\/p>\n
Q = Weir flow <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n Weirs can be affected by submergence, i.e., when the tailwater or downstream water surface rises above the weir\u2019s crest, thus reducing the discharge. The weir flow Q computed from the above equation is reduced by the following:<\/p>\n Where: <\/p>\n","protected":false},"excerpt":{"rendered":" Weir flow is automatically computed for Inline Weir sections. The program employs the standard weir equation as described below. If the weir structure width (b) is less than the one-half the flow depth (H), it is considered a sharp crested weir. Otherwise, it’s treated as a broad crested weir. Where:…<\/p>\n","protected":false},"author":1,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[43],"ht-kb-tag":[],"class_list":["post-683","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-inline-weirs"],"_links":{"self":[{"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/ht-kb\/683","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/comments?post=683"}],"version-history":[{"count":6,"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/ht-kb\/683\/revisions"}],"predecessor-version":[{"id":913,"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/ht-kb\/683\/revisions\/913"}],"wp:attachment":[{"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/media?parent=683"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/ht-kb-category?post=683"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/ht-kb-tag?post=683"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nCw = Broad-crested weir coefficient = 2.66 (1.5)
\nCw = Sharp-crested weir coefficient = 3.33 (1.84)
\nL = Crest width
\nH = Water surface – crest elevation<\/p>\n![\"\"](\"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-content\/uploads\/sites\/5\/2017\/10\/WeirSharp.png\")
![\"\"](\"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-content\/uploads\/sites\/5\/2017\/10\/Broad_crested_weir.png\")
Adjustment for Submerged Weirs<\/h3>\n
![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/11\/SubmergeWeir.png\")
The equation for the reduction in flow is:<\/p>\n![\"\"](\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/11\/EqWeirSubm.png\")
<\/p>\n
\nQs = submerged flow (cfs)
\nQr = unsubmerged flow from standard weir equations
\nH1 = upstream head above crest (ft)
\nH2 = downstream head above crest (ft)<\/p>\n