# boundary coniditions of flood inundation model

**URL:** <https://opentelemac.org/forum/t/boundary-coniditions-of-flood-inundation-model/8166>\
**Category:** TELEMAC-2D\
**Created:** [October 10, 2026, 3:42am UTC](https://opentelemac.org/forum/t/boundary-coniditions-of-flood-inundation-model/8166 "2026-10-10T03:42:47Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![user\_16516](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/a4c791/32.png) [@user\_16516](https://opentelemac.org/forum/u/user_16516)\
**Post date:** [October 10, 2026, 3:42am UTC](https://opentelemac.org/forum/t/boundary-coniditions-of-flood-inundation-model/8166/1 "2026-10-10T03:42:47Z")

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Hi [name removed],

I am establishing a flood inundation model by telemac-2d. I am wondering how should I set the boundary conditions at the side of floodplain?(as shown the selected boundary in the photo) I want the water can free move out to the domain (not a closed wall). How should I set the .bc file?

[name removed]

 ![boundaryphoto.png](https://opentelemac.org/uploads/default/original/2X/6/69e06b4c52992d9d7385f88e2f8d16540f1d7c80.jpeg)