diff --git a/src/Model/Scenario.py b/src/Model/Scenario.py
index 9139cb25..39df1d70 100644
--- a/src/Model/Scenario.py
+++ b/src/Model/Scenario.py
@@ -17,16 +17,43 @@
 # -*- coding: utf-8 -*-
 
 import os
+import logging
 
 from tools import logger_exception
 
 from Model.Tools.PamhyrDB import SQLSubModel
 
+logger = logging.getLogger()
+
 
 class Scenario(SQLSubModel):
     _id_cnt = 0
     _sub_classes = []
 
+    related_tables = [
+        # Adists
+        "output_rk_adists",
+        "boundary_condition_adists", "boundary_condition_data_adists",
+        "lateral_contribution_adists", "lateral_contribution_data_adists",
+        "initial_conditions_adists",
+        "d90_adists", "dif_adists",
+        "pollutants", "pollutants_characteristics",
+        # Hydraulic
+        "additional_files",
+        "boundary_condition", "boundary_condition_data",
+        "lateral_contribution", "lateral_contribution_data",
+        "friction", "stricklers",
+        "hydraulic_structures",
+        "hydraulic_structures_basic", "hydraulic_structures_basic_value",
+        "initial_conditions",
+        "sedimentary_layer", "sedimentary_layer_layer",
+        "reservoir", "reservoir_data",
+        "rep_lines",
+        "solver_parameter",
+        "geometry_pointXYZ", "geometry_profileXYZ",
+        "river_reach", "river_node",
+    ]
+
     def __init__(self,
                  id: int = -1,
                  name: str = "",
@@ -171,29 +198,7 @@ class Scenario(SQLSubModel):
     def drop_all(self, execute):
         execute(f"DELETE FROM scenario WHERE id = {self.id}")
 
-        tables = [
-            # Adists
-            "output_rk_adists",
-            "boundary_condition_adists", "boundary_condition_data_adists",
-            "lateral_contribution_adists", "lateral_contribution_data_adists",
-            "initial_conditions_adists",
-            "d90_adists", "dif_adists",
-            "pollutants", "pollutants_characteristics",
-            # Hydraulic
-            "additional_files",
-            "boundary_condition", "boundary_condition_data",
-            "lateral_contribution", "lateral_contribution_data",
-            "friction", "stricklers",
-            "hydraulic_structures",
-            "hydraulic_structures_basic", "hydraulic_structures_basic_value",
-            "initial_conditions",
-            "sedimentary_layer", "sedimentary_layer_layer",
-            "reservoir", "reservoir_data",
-            "rep_lines",
-            "solver_parameter",
-            "geometry_pointXYZ", "geometry_profileXYZ",
-            "river_reach", "river_node",
-        ]
+        tables = self.related_tables
 
         for table in tables:
             execute(
@@ -203,6 +208,55 @@ class Scenario(SQLSubModel):
 
         return True
 
+    def get_parent_branch(self):
+        def aux(scenario, acc):
+            if scenario.parent == None:
+                return [scenario.id] + acc
+
+            return aux(scenario.parent, [scenario.id] + acc)
+
+        return aux(self, [])
+
+    def drop_deleted_data(self, execute):
+        tables = self.related_tables
+        branch = self.get_parent_branch()
+
+        for table in tables:
+            if self.parent == None:
+                execute(
+                    f"DELETE FROM {table} " +
+                    f"WHERE scenario = {self.id} " +
+                    "AND deleted = TRUE"
+                )
+                continue
+
+            ids = execute(
+                f"""
+                  SELECT pamhyr_id FROM {table}
+                  WHERE deleted = TRUE
+                  AND scenario = {self.id}
+                  AND pamhyr_id NOT IN (
+                    SELECT pamhyr_id FROM {table}
+                    WHERE scenario IN
+                      ({', '.join(map(str, branch[:-1]))})
+                  )
+                """, fetch_one=False
+            )
+            if ids == None or len(ids) == 0:
+                continue
+
+            logger.debug(
+                f"Drop deleted data into '{table}' : {ids}"
+            )
+
+            execute(
+                f"DELETE FROM {table} " +
+                f"WHERE scenario = {self.id} " +
+                f"AND pamhyr_id IN ({', '.join(map(lambda x: str(x[0]), ids))})"
+            )
+
+        return True
+
     @property
     def id(self):
         return self._id