diff --git a/src/Model/LateralContribution/LateralContribution.py b/src/Model/LateralContribution/LateralContribution.py
index 5e9e5469..ff418f7d 100644
--- a/src/Model/LateralContribution/LateralContribution.py
+++ b/src/Model/LateralContribution/LateralContribution.py
@@ -223,6 +223,11 @@ class LateralContribution(SQLSubModel):
         self._data = []
         self._header = []
         self._types = [float, float]
+        # Grain size of the sediment brought by a solid contribution:
+        # median diameter (m) and spread sqrt(d84/d16), as for a solid
+        # boundary condition
+        self._d50 = 0.002
+        self._sigma = 1.0
 
     @classmethod
     def _db_create(cls, execute, ext=""):
@@ -236,6 +241,8 @@ class LateralContribution(SQLSubModel):
             reach INTEGER,
             begin_section INTEGER,
             end_section INTEGER,
+            d50 REAL DEFAULT 0.002,
+            sigma REAL DEFAULT 1,
             {Scenario.create_db_add_scenario()},
             {Scenario.create_db_add_scenario_fk()},
             FOREIGN KEY(reach) REFERENCES river_reach(pamhyr_id),
@@ -286,8 +293,32 @@ class LateralContribution(SQLSubModel):
                     "ADD COLUMN deleted BOOLEAN NOT NULL DEFAULT FALSE"
                 )
 
+        if major == "0" and (int(minor) < 2 or
+                             (minor == "2" and int(release) < 11)):
+            cls._db_update_to_0_2_11(execute)
+
         return cls._update_submodel(execute, version, data)
 
+    @classmethod
+    def _db_update_to_0_2_11(cls, execute):
+        # The table may already have been recreated with these columns
+        # by _db_update_to_0_2_0
+        columns = [
+            row[0] for row in execute(
+                "SELECT name FROM pragma_table_info('lateral_contribution')"
+            )
+        ]
+        if "d50" not in columns:
+            execute(
+                "ALTER TABLE lateral_contribution " +
+                "ADD COLUMN d50 REAL DEFAULT 0.002"
+            )
+        if "sigma" not in columns:
+            execute(
+                "ALTER TABLE lateral_contribution " +
+                "ADD COLUMN sigma REAL DEFAULT 1"
+            )
+
     @classmethod
     def _db_update_to_0_2_0(cls, execute, data):
         table = "lateral_contribution"
@@ -339,7 +370,7 @@ class LateralContribution(SQLSubModel):
 
         table = execute(
             "SELECT pamhyr_id, deleted, name, type, " +
-            "reach, begin_section, end_section, scenario " +
+            "reach, begin_section, end_section, d50, sigma, scenario " +
             "FROM lateral_contribution " +
             f"WHERE tab = '{tab}'" +
             f"AND scenario = {scenario.id} " +
@@ -356,6 +387,8 @@ class LateralContribution(SQLSubModel):
             reach = next(it)
             b_section = next(it)
             e_section = next(it)
+            d50 = next(it)
+            sigma = next(it)
             owner_scenario = next(it)
 
             ctor = cls._get_ctor_from_type(t)
@@ -367,6 +400,10 @@ class LateralContribution(SQLSubModel):
             lc.reach = None
             lc._begin_section = None
             lc._end_section = None
+            if d50 is not None:
+                lc._d50 = float(d50)
+            if sigma is not None:
+                lc._sigma = float(sigma)
 
             if row[3] != -1:
                 lc.reach = next(
@@ -426,12 +463,13 @@ class LateralContribution(SQLSubModel):
             "INSERT INTO " +
             "lateral_contribution(" +
             "pamhyr_id, deleted, name, type, tab, " +
-            "reach, begin_section, end_section, scenario) " +
+            "reach, begin_section, end_section, d50, sigma, scenario) " +
             "VALUES (" +
             f"{self.id},  {self._db_format(self.is_deleted())}, " +
             f"'{self._db_format(self._name)}', " +
             f"'{self._db_format(self._type)}', '{tab}', {reach}, " +
             f"{begin_section}, {end_section}, " +
+            f"{self._d50}, {self._sigma}, " +
             f"{self._status.scenario_id}" +
             ")"
         )
@@ -523,10 +561,30 @@ class LateralContribution(SQLSubModel):
         new._reach = reach
         new._begin_section = begin_section
         new._end_section = end_section
+        new._d50 = self._d50
+        new._sigma = self._sigma
         new._data = [data.cloned() for data in self.data]
         new.modified()
         return new
 
+    @property
+    def d50(self):
+        return self._d50
+
+    @d50.setter
+    def d50(self, value):
+        self._d50 = float(value)
+        self.modified()
+
+    @property
+    def sigma(self):
+        return self._sigma
+
+    @sigma.setter
+    def sigma(self, value):
+        self._sigma = float(value)
+        self.modified()
+
     @property
     def begin_rk(self):
         if self._begin_section is None:
diff --git a/src/Model/Study.py b/src/Model/Study.py
index 0299f0f0..e14cef22 100644
--- a/src/Model/Study.py
+++ b/src/Model/Study.py
@@ -48,7 +48,7 @@ logger = logging.getLogger()
 
 
 class Study(SQLModel):
-    _version = "0.2.10"
+    _version = "0.2.11"
 
     _sub_classes = [
         Scenario,
diff --git a/src/View/LateralContribution/Edit/UndoCommand.py b/src/View/LateralContribution/Edit/UndoCommand.py
index 41d3eb08..254a9fac 100644
--- a/src/View/LateralContribution/Edit/UndoCommand.py
+++ b/src/View/LateralContribution/Edit/UndoCommand.py
@@ -44,6 +44,22 @@ class SetDataCommand(QUndoCommand):
         self._data._set_i_c_v(self._index, self._column, self._new)
 
 
+class SetMetaDataCommand(QUndoCommand):
+    def __init__(self, data, column, new_value):
+        QUndoCommand.__init__(self)
+
+        self._data = data
+        self._column = column
+        self._old = getattr(self._data, self._column)
+        self._new = float(new_value)
+
+    def undo(self):
+        setattr(self._data, self._column, self._old)
+
+    def redo(self):
+        setattr(self._data, self._column, self._new)
+
+
 class AddCommand(QUndoCommand):
     def __init__(self, data, index):
         QUndoCommand.__init__(self)
diff --git a/src/View/LateralContribution/Edit/Window.py b/src/View/LateralContribution/Edit/Window.py
index d3f378bd..3084733a 100644
--- a/src/View/LateralContribution/Edit/Window.py
+++ b/src/View/LateralContribution/Edit/Window.py
@@ -35,7 +35,7 @@ from PyQt5.QtWidgets import (
     QDialogButtonBox, QPushButton, QLineEdit,
     QFileDialog, QTableView, QAbstractItemView,
     QUndoStack, QShortcut, QAction, QItemDelegate,
-    QHeaderView,
+    QHeaderView, QVBoxLayout,
 )
 
 from View.Tools.Plot.PamhyrCanvas import MplCanvas
@@ -44,6 +44,8 @@ from View.Tools.Plot.PamhyrToolbar import PamhyrPlotToolbar
 from View.LateralContribution.Edit.translate import LCETranslate
 from View.LateralContribution.Edit.Table import TableModel
 from View.LateralContribution.Edit.Plot import Plot
+from View.LateralContribution.Edit.UndoCommand import SetMetaDataCommand
+from View.BoundaryCondition.Edit.Window import WD50Sigma
 
 _translate = QCoreApplication.translate
 
@@ -54,8 +56,10 @@ class EditLateralContributionWindow(PamhyrWindow):
 
     def __init__(self, data=None,
                  study=None, config=None,
-                 parent=None):
+                 tab="liquid", parent=None):
         self._data = data
+        # Grain size of the sediment brought: solid contributions only
+        self._is_solid = tab == "solid"
 
         trad = LCETranslate()
         name = trad[self._pamhyr_name]
@@ -81,6 +85,7 @@ class EditLateralContributionWindow(PamhyrWindow):
 
         self.setup_table()
         self.setup_plot()
+        self.setup_d50sigma()
         self.setup_connections()
 
     def setup_table(self):
@@ -139,6 +144,15 @@ class EditLateralContributionWindow(PamhyrWindow):
         )
         self.plot.draw()
 
+    def setup_d50sigma(self):
+        if not self._is_solid:
+            return
+
+        layout = self.find(QVBoxLayout, "verticalLayout_table")
+        self._d50sigma = WD50Sigma(parent=self)
+        layout.addWidget(self._d50sigma)
+        self.widget_update()
+
     def setup_connections(self):
         if self._study.is_editable():
             self.find(QAction, "action_add").triggered.connect(self.add)
@@ -148,10 +162,31 @@ class EditLateralContributionWindow(PamhyrWindow):
         self._table.dataChanged.connect(self.update)
         self._table.layoutChanged.connect(self.update)
 
+        if self._is_solid:
+            if self._study.is_editable():
+                self._d50sigma.d50Changed.connect(self.d50_changed)
+                self._d50sigma.sigmaChanged.connect(self.sigma_changed)
+            else:
+                self._d50sigma.setEnabled(False)
+
+    def d50_changed(self, value):
+        self._undo_stack.push(SetMetaDataCommand(self._data, "d50", value))
+
+    def sigma_changed(self, value):
+        self._undo_stack.push(
+            SetMetaDataCommand(self._data, "sigma", value)
+        )
+
+    def widget_update(self):
+        if self._is_solid:
+            self._d50sigma.set_d50(self._data.d50)
+            self._d50sigma.set_sigma(self._data.sigma)
+
     def _propagated_update(self, key=Modules(0)):
         if Modules.STUDY in key:
             self._table.layoutChanged.emit()
             self.plot.update()
+            self.widget_update()
 
     def update(self):
         self.plot.update()
@@ -235,7 +270,9 @@ class EditLateralContributionWindow(PamhyrWindow):
     def _undo(self):
         self._table.undo()
         self.plot.update()
+        self.widget_update()
 
     def _redo(self):
         self._table.redo()
         self.plot.update()
+        self.widget_update()
diff --git a/src/View/LateralContribution/Window.py b/src/View/LateralContribution/Window.py
index 2cc857d9..741a1ee8 100644
--- a/src/View/LateralContribution/Window.py
+++ b/src/View/LateralContribution/Window.py
@@ -303,6 +303,7 @@ class LateralContributionWindow(PamhyrWindow):
             win = EditLateralContributionWindow(
                 data=data,
                 study=self._study,
+                tab=tab,
                 parent=self
             )
             win.show()
diff --git a/src/View/ui/EditLateralContribution.ui b/src/View/ui/EditLateralContribution.ui
index 2e739f88..8bff6a22 100644
--- a/src/View/ui/EditLateralContribution.ui
+++ b/src/View/ui/EditLateralContribution.ui
@@ -35,7 +35,13 @@
       <property name="orientation">
        <enum>Qt::Horizontal</enum>
       </property>
-      <widget class="QTableView" name="tableView"/>
+      <widget class="QWidget" name="verticalLayoutWidget_2">
+       <layout class="QVBoxLayout" name="verticalLayout_table">
+        <item>
+         <widget class="QTableView" name="tableView"/>
+        </item>
+       </layout>
+      </widget>
       <widget class="QWidget" name="verticalLayoutWidget">
        <layout class="QVBoxLayout" name="verticalLayout"/>
       </widget>