diff --git a/src/View/BoundaryCondition/Edit/Window.py b/src/View/BoundaryCondition/Edit/Window.py
index 7a1dae2c..34c9e503 100644
--- a/src/View/BoundaryCondition/Edit/Window.py
+++ b/src/View/BoundaryCondition/Edit/Window.py
@@ -133,6 +133,7 @@ class EditBoundaryConditionWindow(PamhyrWindow):
         self.setup_plot()
         self.setup_data()
         self.setup_connections()
+        self.setup_dialog()
 
     def setup_data(self):
         self._is_solid = self._data.bctype == "SL"
@@ -217,6 +218,10 @@ class EditBoundaryConditionWindow(PamhyrWindow):
             self._d50sigma.d50Changed.connect(self.d50_changed)
             self._d50sigma.sigmaChanged.connect(self.sigma_changed)
 
+    def setup_dialog(self):
+        reach = self._data.reach(self._study.river)[0]
+        self.slope_value = abs(reach.get_incline_median_mean())
+
     def d50_changed(self, value):
         self._undo_stack.push(
             SetMetaDataCommand(
@@ -335,13 +340,12 @@ class EditBoundaryConditionWindow(PamhyrWindow):
                 return
             reach = self._data.reach(self._study.river)[0]
             profile = reach.profiles[-1]
-            incline = abs(reach.get_incline_median_mean())
-            dlg = GenerateDialog(incline,
+            dlg = GenerateDialog(self.slope_value,
                                  reach,
                                  trad=self._trad,
                                  parent=self)
             if dlg.exec():
-                incline = dlg.value
+                self.slope_value = dlg.value
             frictions = reach._parent.frictions.frictions
             z_min = profile.z_min()
             z_max = profile.z_max()
@@ -353,7 +357,7 @@ class EditBoundaryConditionWindow(PamhyrWindow):
                 strickler = 25.0
             height = [(i)*(z_max-z_min)/50 for i in range(51)]
             q = [((profile.wet_width(z_min + h) * 0.8) * strickler
-                  * (h ** (5/3)) * (abs(incline) ** (0.5)))
+                  * (h ** (5/3)) * (abs(self.slope_value) ** (0.5)))
                  for h in height]
             for i in range(len(height)):
                 height[i] += z_min