diff --git a/src/View/WeatherParameters/Table.py b/src/View/WeatherParameters/Table.py
index 7ce653d8..ef0b16af 100644
--- a/src/View/WeatherParameters/Table.py
+++ b/src/View/WeatherParameters/Table.py
@@ -30,7 +30,7 @@ from PyQt5.QtWidgets import (
     QDialogButtonBox, QPushButton, QLineEdit,
     QFileDialog, QTableView, QAbstractItemView,
     QUndoStack, QShortcut, QAction, QItemDelegate,
-    QComboBox,
+    QComboBox, QMessageBox,
 )
 
 from View.Tools.PamhyrTable import PamhyrTableModel
@@ -222,6 +222,10 @@ class WeatherParametersTableModel(PamhyrTableModel):
                     p for p in _edge.reach.profiles
                     if p.pamhyr_id == value
                 )
+                if self._overlaps_existing_interval(
+                        row, begin_section=_begin_rk):
+                    self._show_overlap_warning()
+                    return False
                 self._undo.push(
                     SetBeginCommand(
                         self._data, global_row, _begin_rk
@@ -233,15 +237,24 @@ class WeatherParametersTableModel(PamhyrTableModel):
                     p for p in _edge.reach.profiles
                     if p.pamhyr_id == value
                 )
+                if self._overlaps_existing_interval(
+                        row, end_section=_end_rk):
+                    self._show_overlap_warning()
+                    return False
                 self._undo.push(
                     SetEndCommand(
                         self._data, global_row, _end_rk
                     )
                 )
             elif self._headers[column] == "reach":
+                new_reach = self._river.edge(value)
+                if self._overlaps_existing_interval(
+                        row, reach=new_reach):
+                    self._show_overlap_warning()
+                    return False
                 self._undo.push(
                     SetEdgeCommand(
-                        self._data, global_row, self._river.edge(value)
+                        self._data, global_row, new_reach
                     )
                 )
         except Exception as e:
@@ -251,6 +264,48 @@ class WeatherParametersTableModel(PamhyrTableModel):
         self.dataChanged.emit(index, index)
         return True
 
+    def _overlaps_existing_interval(self, row, reach=None,
+                                    begin_section=None, end_section=None):
+        current = self._lst[row]
+        reach = current.reach if reach is None else reach
+        if reach is None:
+            return False
+
+        if begin_section is None:
+            begin_section = (
+                reach.reach.profiles[0]
+                if reach is not current.reach and reach.reach.profiles
+                else current.begin_section
+            )
+        if end_section is None:
+            end_section = (
+                reach.reach.profiles[-1]
+                if reach is not current.reach and reach.reach.profiles
+                else current.end_section
+            )
+        if begin_section is None or end_section is None:
+            return False
+
+        lower, upper = sorted((begin_section.rk, end_section.rk))
+        return any(
+            other is not current
+            and not other.is_deleted()
+            and other.type == current.type
+            and other.reach is reach
+            and other.begin_section is not None
+            and other.end_section is not None
+            and max(lower, min(other.begin_rk, other.end_rk))
+            < min(upper, max(other.begin_rk, other.end_rk))
+            for other in self._data.lst
+        )
+
+    def _show_overlap_warning(self):
+        QMessageBox.warning(
+            self._table_view,
+            self._trad["msg_rk_overlap_title"],
+            self._trad["msg_rk_overlap_text"]
+        )
+
     def add(self, row, parent=QModelIndex()):
         self.beginInsertRows(parent, row, row)
 
diff --git a/src/View/WeatherParameters/translate.py b/src/View/WeatherParameters/translate.py
index 7f4fc107..0b8b3162 100644
--- a/src/View/WeatherParameters/translate.py
+++ b/src/View/WeatherParameters/translate.py
@@ -41,6 +41,14 @@ class WeatherParametersTranslate(MainTranslate):
             "These values are applied to sections that have not been "
             "defined using time series."
         )
+        self._dict["msg_rk_overlap_title"] = _translate(
+            "WeatherParameters", "Overlapping interval"
+        )
+        self._dict["msg_rk_overlap_text"] = _translate(
+            "WeatherParameters",
+            "Two weather-parameter intervals of the same type cannot "
+            "overlap on the same reach."
+        )
 
         self._dict["rk"] = self._dict["unit_rk"]