diff --git a/src/Model/InitialConditions/InitialConditions.py b/src/Model/InitialConditions/InitialConditions.py
index 71da30cf..0475e705 100644
--- a/src/Model/InitialConditions/InitialConditions.py
+++ b/src/Model/InitialConditions/InitialConditions.py
@@ -463,11 +463,14 @@ class InitialConditions(SQLSubModel):
             if not compute_height:
                 height = data_height[profile.rk]
             else:
-                height = (
-                    discharge
-                    /
-                    ((width * 0.8) * strickler * (abs(incline) ** (0.5)))
-                ) ** (0.6)
+                if abs(incline) <= 0:
+                    height = 0.0
+                else:
+                    height = (
+                        discharge
+                        /
+                        ((width * 0.8) * strickler * (abs(incline) ** (0.5)))
+                    ) ** (0.6)
 
             elevation = max(
                 profile.z_min() + height,