{"id":857,"date":"2017-11-08T23:23:05","date_gmt":"2017-11-08T23:23:05","guid":{"rendered":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/?post_type=ht_kb&p=857"},"modified":"2022-10-03T17:32:14","modified_gmt":"2022-10-03T17:32:14","slug":"exfiltration","status":"publish","type":"ht_kb","link":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/knowledge-base\/exfiltration\/","title":{"rendered":"Exfiltration"},"content":{"rendered":"

Exfiltration is a term used by Hydrology Studio indicating flow exits<\/em> the pond. It can be used interchangeably with infiltration. Exfiltration flows are based on the contour area at each stage or elevation. They are computed using the following equation:<\/p>\n

\"\"<\/p>\n

Where:
Qex = outflow (cfs)
ER = exfiltration (percolation) rate (in\/hr)
SA = contour surface area at a particular stage (sqft)<\/p>\n

\"\"<\/p>\n

When Exfiltration is the Only Outflow<\/h3>\n

If Exfiltration is the only outlet device in your pond, be sure the pond’s contours increase with increasing stage. That is, avoid specifying a pond with zero side slopes. The Stage vs. Q curve in your pond must have a forward slope in order to execute proper routing calculations.<\/p>\n

Retention Pond Recovery in Shallow Aquifers<\/h2>\n\n\n

Looking to calculate mounding and recovery times (unsaturated and saturated) for retention ponds in shallow sandy aquifers? Check out Studio Express Groundwater feature<\/a>.<\/p>\n\n\n\n

\"Retention
Studio Express Groundwater calculates retention pond recovery times in aquifers like this.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

Computing exfiltration<\/p>\n","protected":false},"author":1,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[38],"ht-kb-tag":[],"class_list":["post-857","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-detention-pond-stage-storage-discharge"],"_links":{"self":[{"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/ht-kb\/857","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=857"}],"version-history":[{"count":13,"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/ht-kb\/857\/revisions"}],"predecessor-version":[{"id":3817,"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/ht-kb\/857\/revisions\/3817"}],"wp:attachment":[{"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/media?parent=857"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/ht-kb-category?post=857"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/hydrology-studio\/wp-json\/wp\/v2\/ht-kb-tag?post=857"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}