# Initial Condition: user\_condin\_h.f and free surface **URL:** \ **Category:** TELEMAC-2D\ **Created:** [August 8, 2025, 6:23am UTC](https://opentelemac.org/forum/t/initial-condition-user-condin-h-f-and-free-surface/8037 "2025-08-08T06:23:57Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![user\_17382](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/ec9cab/32.png) [@user\_17382](https://opentelemac.org/forum/u/user_17382)\ **Post date:** [August 8, 2025, 6:23am UTC](https://opentelemac.org/forum/t/initial-condition-user-condin-h-f-and-free-surface/8037/1 "2025-08-08T06:23:57Z")
Hi [name removed], i’m trying to model a dam break with flooding of the surrounding areas. To initiate the model I want to have water in the river but not in surrounding areas that are below the riverbed. As far as i understand, I could use the initial condition “special” and use the “user\_condin\_h.f” but i don’t know how. Can anyone provide an example or tell me, if there is an example on telemac-2d that comes with the user\_condin\_h.f ? My idea would be to provide an intial free surface with the water levels that i want and define in the user\_condin\_h.f that water depth = free surface - bottom. Can anyone tell me if that works or give some advice how to setup the model? Thanks so much! [name removed] ---
**Author:** ![user\_438](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/c77e96/32.png) [@user\_438](https://opentelemac.org/forum/u/user_438)\ **Post date:** [October 23, 2025, 5:46pm UTC](https://opentelemac.org/forum/t/initial-condition-user-condin-h-f-and-free-surface/8037/2 "2025-10-23T17:46:19Z")
Hello [name removed], The TELEMAC-2D examples are located in $HOMETEL/examples/telemac2d folder. Examples of user\_condin\_h.f can be found in subfolders user\_fortran (or a name with this prefix) of a few examples. You can have a look at breach, malpasset, digue, balzano or wesel e.g. Hope this helps, [name removed]