> For the complete documentation index, see [llms.txt](https://swatplus.gitbook.io/io-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swatplus.gitbook.io/io-docs/theoretical-documentation/section-8-water-bodies/impoundment-water-routing/ponds-wetlands/seepage.md).

# Seepage

The volume of water lost by seepage through the bottom of the pond or wetland on a given day is calculated:

                  $$V\_{seep}=240\*K\_{sat}\*SA$$                                                               8:1.2.10

where $$V\_{seep}$$ is the volume of water lost from the water body by seepage (m$$^3$$ H$$*2$$O), $$K*{sat}$$ is the effective saturated hydraulic conductivity of the pond or wetland bottom (mm/hr), and $$SA$$ is the surface area of the water body (ha).