# CCTM - dynamic boundary condition

**URL:** <https://forum.cmascenter.org/t/cctm-dynamic-boundary-condition/848>\
**Category:** CMAQ\
**Created:** [July 29, 2019, 7:54am UTC](https://forum.cmascenter.org/t/cctm-dynamic-boundary-condition/848 "2019-07-29T07:54:47Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![lizadams](https://avatars.discourse-cdn.com/v4/letter/l/49beb7/32.png) [@lizadams](https://forum.cmascenter.org/u/lizadams)\
**Post date:** [August 5, 2019, 7:06pm UTC](https://forum.cmascenter.org/t/cctm-dynamic-boundary-condition/848/4 "2019-08-05T19:06:54Z")

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Hi,

The BC file doesn’t get reset for each loop, only the IC file.

The BC file is set using this line.  
#\> Boundary conditions  
set BCFILE = BCON\_${YYYYMMDD}\_bench.nc

If you want the script to use the same file for every day of the run, the remove the date stamp.

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