# Reg. saving the permeability in the output file

**URL:** <https://discourse.opengeosys.org/t/reg-saving-the-permeability-in-the-output-file/1237>\
**Category:** Help & Support\
**Created:** [June 24, 2023, 5:35am UTC](https://discourse.opengeosys.org/t/reg-saving-the-permeability-in-the-output-file/1237 "2023-06-24T05:35:58Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![pavanbhukya](https://discourse.opengeosys.org/user_avatar/discourse.opengeosys.org/pavanbhukya/32/1325_2.png) [@pavanbhukya](https://discourse.opengeosys.org/u/pavanbhukya)\
**Post date:** [June 24, 2023, 5:35am UTC](https://discourse.opengeosys.org/t/reg-saving-the-permeability-in-the-output-file/1237/1 "2023-06-24T05:35:58Z")

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Dear Sir,

I am Pavan. Recently, I have tried the `chemically_induced_porosity_change` option in OGS to implement the Kozeny-Carman relation for the chemically induced porosity changes due to calcite precipitation.

Somehow I could visualise the porosity changes in the output files. However, I would like to store the altered permeability values at each time step in the output files. Let me know if there’s any way to do that.

Thanks  
Pavan