{"id":1078,"date":"2017-12-13T23:22:28","date_gmt":"2017-12-13T23:22:28","guid":{"rendered":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/?post_type=ht_kb&p=1078"},"modified":"2024-08-14T18:34:00","modified_gmt":"2024-08-14T18:34:00","slug":"modify-your-return-periods","status":"publish","type":"ht_kb","link":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/knowledge-base\/modify-your-return-periods\/","title":{"rendered":"Modify Your Return Periods"},"content":{"rendered":"\n

Hydrology Studio has pre-set frequencies or return periods that it uses for the IDF Curves and the Design Storms. Those are specifically 1, 2, 3, 5, 10, 25, 50 and 100-year. You have the option to select alternates to the 25-year, 50-year and the 100-year events. For example, you may wish to use 15 or 20-year frequency instead of the default 25-year or the 500-year instead of the default 100-year.<\/p>\n\n\n\n

It is recommended that you customize the return periods prior to creating or importing new IDF curves. Note that these are simply labels and changing them will not affect the underlying data.<\/p>\n\n\n\n

How to Modify the Return Period Labels<\/h2>\n\n\n\n

Open the Rainfall Wizard by clicking the Rainfall button on the Rainfall tab on the main window.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Then click the [Settings] button while viewing the Rainfall Wizard main screen. This button is available on the IDF Curves, Precipitation and Design Storms tabs.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

The following screen appears:<\/p>\n\n\n\n

\"\"
Now select alternates to the 25-year, 50-year and 100-year events. The 25-year label can only be changed to 15 or 20; the 50-year to 100-year and the 100-year label can be changed to 200 or 500. The remaining return periods are fixed and cannot be edited.<\/p>\n\n\n\n

Once you have selected the desired storm frequencies, click [Ok]. The input and output tables will now include these frequencies. For example, the new frequencies shown below include the 15 and 500-year events.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

It should be noted that you cannot make changes to the custom frequencies,\u00a025-year, 50-year and 100-year, when setting up your new IDF curves using Hydro-35 or NOAA Atlas 2. This method is limited to the default frequencies. Any changes made to the return periods will revert back to the defaults.<\/p>\n","protected":false},"excerpt":{"rendered":"

Explains how to customize the default frequencies to match yours<\/p>\n","protected":false},"author":1,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[22],"ht-kb-tag":[],"class_list":["post-1078","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-setting-up-rainfall"],"_links":{"self":[{"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/ht-kb\/1078","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/comments?post=1078"}],"version-history":[{"count":7,"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/ht-kb\/1078\/revisions"}],"predecessor-version":[{"id":4262,"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/ht-kb\/1078\/revisions\/4262"}],"wp:attachment":[{"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/media?parent=1078"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/ht-kb-category?post=1078"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/ht-kb-tag?post=1078"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}