diff --git a/src/Model/D90AdisTS/D90AdisTS.py b/src/Model/D90AdisTS/D90AdisTS.py
index f901bf01..80ac1267 100644
--- a/src/Model/D90AdisTS/D90AdisTS.py
+++ b/src/Model/D90AdisTS/D90AdisTS.py
@@ -305,7 +305,7 @@ class D90AdisTS(SQLSubModel):
             for new_reach, part_lower, part_upper in parts:
                 clipped_lower = max(lower, part_lower)
                 clipped_upper = min(upper, part_upper)
-                if clipped_lower > clipped_upper:
+                if clipped_lower >= clipped_upper:
                     continue
 
                 start_rk = clipped_upper if reverse else clipped_lower
diff --git a/src/Model/DIFAdisTS/DIFAdisTS.py b/src/Model/DIFAdisTS/DIFAdisTS.py
index 97c05064..f907a40e 100644
--- a/src/Model/DIFAdisTS/DIFAdisTS.py
+++ b/src/Model/DIFAdisTS/DIFAdisTS.py
@@ -359,7 +359,7 @@ class DIFAdisTS(SQLSubModel):
             for new_reach, part_lower, part_upper in parts:
                 clipped_lower = max(lower, part_lower)
                 clipped_upper = min(upper, part_upper)
-                if clipped_lower > clipped_upper:
+                if clipped_lower >= clipped_upper:
                     continue
 
                 start_rk = clipped_upper if reverse else clipped_lower
diff --git a/src/Model/Friction/FrictionList.py b/src/Model/Friction/FrictionList.py
index 963c3316..df4573b8 100644
--- a/src/Model/Friction/FrictionList.py
+++ b/src/Model/Friction/FrictionList.py
@@ -109,16 +109,22 @@ class FrictionList(PamhyrModelList):
             ((999 ** 100), -(999 ** 100))
         )
 
-        frictions = list(
-            filter(
-                lambda f: ((rk_min <= f.begin_rk <= rk_max) or
-                           (rk_min <= f.end_rk <= rk_max)),
-                self._lst))
+        for friction in self.lst:
+            lower, upper = sorted((friction.begin_rk, friction.end_rk))
+            clipped_lower = max(lower, rk_min)
+            clipped_upper = min(upper, rk_max)
+            if clipped_lower >= clipped_upper:
+                continue
 
-        for ind, friction in enumerate(frictions):
             n = friction.cloned_for(reach)
+            if friction.begin_rk > friction.end_rk:
+                n.begin_rk = clipped_upper
+                n.end_rk = clipped_lower
+            else:
+                n.begin_rk = clipped_lower
+                n.end_rk = clipped_upper
 
-            new._lst.insert(ind, n)
+            new._lst.append(n)
             new._status.modified()
 
         return new
diff --git a/src/Model/InitialConditionsAdisTS/InitialConditionsAdisTS.py b/src/Model/InitialConditionsAdisTS/InitialConditionsAdisTS.py
index 65a72e90..903fe877 100644
--- a/src/Model/InitialConditionsAdisTS/InitialConditionsAdisTS.py
+++ b/src/Model/InitialConditionsAdisTS/InitialConditionsAdisTS.py
@@ -391,7 +391,7 @@ class InitialConditionsAdisTS(SQLSubModel):
             for new_reach, part_lower, part_upper in parts:
                 clipped_lower = max(lower, part_lower)
                 clipped_upper = min(upper, part_upper)
-                if clipped_lower > clipped_upper:
+                if clipped_lower >= clipped_upper:
                     continue
 
                 start_rk = clipped_upper if reverse else clipped_lower
diff --git a/src/Model/InitialConditionsTemperature/InitialConditionsTemperature.py b/src/Model/InitialConditionsTemperature/InitialConditionsTemperature.py
index 33e2c99e..986e603e 100644
--- a/src/Model/InitialConditionsTemperature/InitialConditionsTemperature.py
+++ b/src/Model/InitialConditionsTemperature/InitialConditionsTemperature.py
@@ -254,7 +254,7 @@ class InitialConditionsTemperature(SQLSubModel):
             for new_reach, part_lower, part_upper in parts:
                 clipped_lower = max(lower, part_lower)
                 clipped_upper = min(upper, part_upper)
-                if clipped_lower > clipped_upper:
+                if clipped_lower >= clipped_upper:
                     continue
 
                 start_rk = clipped_upper if reverse else clipped_lower
diff --git a/src/Model/LateralContribution/LateralContributionList.py b/src/Model/LateralContribution/LateralContributionList.py
index c6aa7162..803d2c27 100644
--- a/src/Model/LateralContribution/LateralContributionList.py
+++ b/src/Model/LateralContribution/LateralContributionList.py
@@ -117,7 +117,7 @@ class LateralContributionList(PamhyrModelListWithTab):
                 for new_reach, part_lower, part_upper, sections in parts:
                     clipped_lower = max(lower, part_lower)
                     clipped_upper = min(upper, part_upper)
-                    if clipped_lower > clipped_upper:
+                    if clipped_lower >= clipped_upper:
                         continue
 
                     begin_index = (
diff --git a/src/Model/LateralContributionsAdisTS/LateralContributionsAdisTSList.py b/src/Model/LateralContributionsAdisTS/LateralContributionsAdisTSList.py
index ad9d2783..05bc07f1 100644
--- a/src/Model/LateralContributionsAdisTS/LateralContributionsAdisTSList.py
+++ b/src/Model/LateralContributionsAdisTS/LateralContributionsAdisTSList.py
@@ -95,7 +95,7 @@ class LateralContributionsAdisTSList(PamhyrModelList):
             for new_reach, part_lower, part_upper in parts:
                 clipped_lower = max(lower, part_lower)
                 clipped_upper = min(upper, part_upper)
-                if clipped_lower > clipped_upper:
+                if clipped_lower >= clipped_upper:
                     continue
 
                 begin_rk = clipped_upper if reverse else clipped_lower
diff --git a/src/Model/WeatherParameters/WeatherParametersList.py b/src/Model/WeatherParameters/WeatherParametersList.py
index 399308ff..8669e34f 100644
--- a/src/Model/WeatherParameters/WeatherParametersList.py
+++ b/src/Model/WeatherParameters/WeatherParametersList.py
@@ -204,7 +204,7 @@ class WeatherParametersList(PamhyrModelList):
             for new_reach, part_lower, part_upper, sections in parts:
                 clipped_lower = max(lower, part_lower)
                 clipped_upper = min(upper, part_upper)
-                if clipped_lower > clipped_upper:
+                if clipped_lower >= clipped_upper:
                     continue
 
                 begin_index = clipped_upper if reverse else clipped_lower