{"id":569,"date":"2017-10-12T16:40:09","date_gmt":"2017-10-12T16:40:09","guid":{"rendered":"https:\/\/learn.hydrologystudio.com\/channel-studio\/?post_type=ht_kb&p=569"},"modified":"2024-01-15T18:17:13","modified_gmt":"2024-01-15T18:17:13","slug":"friction-loss-options","status":"publish","type":"ht_kb","link":"https:\/\/learn.hydrologystudio.com\/channel-studio\/knowledge-base\/friction-loss-options\/","title":{"rendered":"Friction Loss Options"},"content":{"rendered":"

Channel Studio offers three different methods for computing friction losses. These options are selected on the Compute tab as shown below.<\/p>\n

\"\"<\/p>\n

In general, friction loss is computed as the product of Sf and the discharge-weighted reach length, L. The friction slope (slope of the energy grade line) at each cross section is computed as follows:<\/p>\n

Average Conveyance<\/h2>\n

This is the default method used and is known to provide the best overall results compared to the Average Friction Slope and Geometric Mean.<\/p>\n

\"\"<\/p>\n

Where:<\/p>\n

Sf = Friction slope
\nQ = Total flow at the cross-section
\nK = Total conveyance at the cross-section<\/p>\n

Average Friction Slope<\/h2>\n

Use this method when you are dealing with channels at steeper slopes, subcritical and supercritical profiles.<\/p>\n

\"\"<\/p>\n

Where:<\/p>\n

Sf = Friction slope
\nSf1, Sf2 = (Q\/K)^2
\nK = Total conveyance at the cross-section<\/p>\n

Geometric Mean<\/h2>\n

Use when working mainly with supercritical flow profiles.<\/p>\n

\"\"<\/p>\n

Where:<\/p>\n

Sf = Friction slope
\nSf1, Sf2 = (Q\/K)^2
\nK = Total conveyance at the cross-section<\/p>\n

Conveyance<\/h3>\n

Conveyance, K, is computed as:<\/p>\n

\"\"<\/p>\n

Where:<\/p>\n

Cm = Manning Coefficient = 1.486 (1.00)
\nn = Roughness coefficient
\nA = Cross-sectional area of flow
\nR = Hydraulic radius = Area\/Wetted Perimeter<\/p>\n","protected":false},"excerpt":{"rendered":"

A description of the different ways Channel Studio can calculate friction losses<\/p>\n","protected":false},"author":2,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[40],"ht-kb-tag":[],"class_list":["post-569","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-open-channels"],"_links":{"self":[{"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/ht-kb\/569","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\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/comments?post=569"}],"version-history":[{"count":5,"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/ht-kb\/569\/revisions"}],"predecessor-version":[{"id":1703,"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/ht-kb\/569\/revisions\/1703"}],"wp:attachment":[{"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/media?parent=569"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/ht-kb-category?post=569"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/channel-studio\/wp-json\/wp\/v2\/ht-kb-tag?post=569"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}