# Free Surface in seepage

**URL:** <https://discourse.opengeosys.org/t/free-surface-in-seepage/1670>\
**Category:** Help & Support\
**Created:** [August 11, 2025, 2:30am UTC](https://discourse.opengeosys.org/t/free-surface-in-seepage/1670 "2025-08-11T02:30:38Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![pinkfloyd-max](https://discourse.opengeosys.org/user_avatar/discourse.opengeosys.org/pinkfloyd-max/32/1363_2.png) [@pinkfloyd-max](https://discourse.opengeosys.org/u/pinkfloyd-max)\
**Post date:** [August 11, 2025, 2:30am UTC](https://discourse.opengeosys.org/t/free-surface-in-seepage/1670/1 "2025-08-11T02:30:38Z")

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How is the free surface calculated during seepage in OpenGeoSys? In which file can the relevant code be found?