{"id":141,"date":"2017-10-27T22:32:32","date_gmt":"2017-10-27T22:32:32","guid":{"rendered":"https:\/\/learn.hydrologystudio.com\/culvert-studio\/?post_type=ht_kb&#038;p=141"},"modified":"2019-02-25T15:12:31","modified_gmt":"2019-02-25T15:12:31","slug":"idf-correction-factors","status":"publish","type":"ht_kb","link":"https:\/\/learn.hydrologystudio.com\/culvert-studio\/knowledge-base\/idf-correction-factors\/","title":{"rendered":"IDF Correction Factors"},"content":{"rendered":"<p>You can enter Frequency Correction Factors, Cf, with your IDF Curves. The Cf factors can be edited on the Known Equation Coefficients screen or the Computed Coefficients screens.<\/p>\n<p>Cf factors are applied to the Runoff Coefficients when computing peak flows for the Rational Method. The intensities shown on your reports will not reflect this factor. The computed flows will, however. The product of C x Cf cannot exceed 1.0.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-238\" src=\"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-content\/uploads\/sites\/2\/2017\/11\/EqRatMethod.jpg\" alt=\"\" width=\"186\" height=\"57\" \/><\/p>\n<p>Correction Factors can be edited while you are setting up your IDF curves. Rather than clicking [Finish] just after entering or importing data, continue to click [Next] until you arrive at the Equation Coefficients screen shown below. There you can enter Cf values. Remember to click the [Apply] button.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-127 size-full\" src=\"https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-content\/uploads\/sites\/4\/2017\/10\/IDFPolyScreen.png\" alt=\"\" width=\"780\" height=\"396\" srcset=\"https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-content\/uploads\/sites\/4\/2017\/10\/IDFPolyScreen.png 780w, https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-content\/uploads\/sites\/4\/2017\/10\/IDFPolyScreen-300x152.png 300w, https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-content\/uploads\/sites\/4\/2017\/10\/IDFPolyScreen-768x390.png 768w, https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-content\/uploads\/sites\/4\/2017\/10\/IDFPolyScreen-50x25.png 50w, https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-content\/uploads\/sites\/4\/2017\/10\/IDFPolyScreen-60x30.png 60w, https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-content\/uploads\/sites\/4\/2017\/10\/IDFPolyScreen-100x51.png 100w\" sizes=\"auto, (max-width: 780px) 100vw, 780px\" \/><\/p>\n<p><em>Edit the Correction Factors, Cf, on this screen<\/em><\/p>\n<h2>Editing Correction Factors<\/h2>\n<p>If you need to edit existing Cfs, click on the [New&#8230;] button.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-106\" src=\"https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-content\/uploads\/sites\/4\/2017\/10\/NewIdfBut.png\" alt=\"\" width=\"58\" height=\"62\" srcset=\"https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-content\/uploads\/sites\/4\/2017\/10\/NewIdfBut.png 58w, https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-content\/uploads\/sites\/4\/2017\/10\/NewIdfBut-47x50.png 47w, https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-content\/uploads\/sites\/4\/2017\/10\/NewIdfBut-56x60.png 56w\" sizes=\"auto, (max-width: 58px) 100vw, 58px\" \/><br \/>\nThen Click [Next]. Then [Next] again to reach the above screen.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cf factors are applied to the Runoff Coefficients when computing peak flows for the Rational Method.<\/p>\n","protected":false},"author":1,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[23],"ht-kb-tag":[],"class_list":["post-141","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-rainfall-idf-curves"],"_links":{"self":[{"href":"https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-json\/wp\/v2\/ht-kb\/141","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-json\/wp\/v2\/comments?post=141"}],"version-history":[{"count":5,"href":"https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-json\/wp\/v2\/ht-kb\/141\/revisions"}],"predecessor-version":[{"id":495,"href":"https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-json\/wp\/v2\/ht-kb\/141\/revisions\/495"}],"wp:attachment":[{"href":"https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-json\/wp\/v2\/media?parent=141"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-json\/wp\/v2\/ht-kb-category?post=141"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/culvert-studio\/wp-json\/wp\/v2\/ht-kb-tag?post=141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}