diff --git a/src/Model/BoundaryCondition/BoundaryConditionTypes.py b/src/Model/BoundaryCondition/BoundaryConditionTypes.py
index 963e88e72d58463e2c62b84be9d11733acd3e0a3..af3c91fdd5228bed070fab8633d5c34b71b0c316 100644
--- a/src/Model/BoundaryCondition/BoundaryConditionTypes.py
+++ b/src/Model/BoundaryCondition/BoundaryConditionTypes.py
@@ -89,6 +89,9 @@ class Solid(BoundaryCondition):
     def __init__(self, id:int = -1, name:str = "", status = None):
         super(Solid, self).__init__(id=id, name=name, status=status)
 
+        self.d50 = 0.002
+        self.sigma = 1
+
         self._type = "SL"
         self._header = ["time", "solid"]
         self._types = [TimeOverDischarge.time_convert, float]
diff --git a/src/Solver/Mage.py b/src/Solver/Mage.py
index 697f8809ea6cbf7d9fec2e71b41f03dbd1dd5507..6ed03e66016cf0ae9573b99b7eb11149ac180bad 100644
--- a/src/Solver/Mage.py
+++ b/src/Solver/Mage.py
@@ -554,13 +554,23 @@ class Mage8(Mage):
             files.append(f"{name}.QSO")
 
             for bound in bounds:
+                # File header
                 name = f"{bound.node.id:3}".replace(" ", "x")
                 f.write(f"* {bound.node.name} ({name}) {bound.bctype}\n")
-                f.write(f"${name} 0.002 1 default\n")
-                # f.write(f"${name}\n")
+
+                d50 = bound.d50
+                sigma = bound.sigma
+
+                if len(bound.data) == 0:
+                    f.write(f"${name} {d50} {sigma} default\n")
+                else:
+                    f.write(f"${name} {d50} {sigma}\n")
+
+                # Table header
                 header = bound.header
                 f.write(f"*{header[0]:>9}|{header[1]:>10}\n")
 
+                # Data
                 for d in bound.data:
                     f.write(f"{d[0]:10.3f}{d[1]:10.3f}\n")
 
diff --git a/src/View/BoundaryCondition/Edit/UndoCommand.py b/src/View/BoundaryCondition/Edit/UndoCommand.py
index 4bb2605fc94213a2b70559807b79ca4e1425613c..b30331a167039f8a201f017460b4984e1ddd42f2 100644
--- a/src/View/BoundaryCondition/Edit/UndoCommand.py
+++ b/src/View/BoundaryCondition/Edit/UndoCommand.py
@@ -16,6 +16,8 @@
 
 # -*- coding: utf-8 -*-
 
+import logging
+
 from copy import deepcopy
 from tools import trace, timer
 
@@ -25,6 +27,8 @@ from PyQt5.QtWidgets import (
 
 from Model.BoundaryCondition.BoundaryCondition import BoundaryCondition
 
+logger = logging.getLogger()
+
 class SetDataCommand(QUndoCommand):
     def __init__(self, data, index, column, new_value):
         QUndoCommand.__init__(self)
@@ -42,6 +46,32 @@ class SetDataCommand(QUndoCommand):
     def redo(self):
         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
+        if self._column == "d50":
+            self._old = self._data.d50
+        elif self._column == "sigma":
+            self._old = self._data.sigma
+
+        self._new = float(new_value)
+
+    def undo(self):
+        if self._column == "d50":
+            self._data.d50 = self._old
+        elif self._column == "sigma":
+            self._data.sigma = self._old
+
+    def redo(self):
+        if self._column == "d50":
+            self._data.d50 = self._new
+        elif self._column == "sigma":
+            self._data.sigma = self._new
+
+
 class AddCommand(QUndoCommand):
     def __init__(self, data, index):
         QUndoCommand.__init__(self)
diff --git a/src/View/BoundaryCondition/Edit/Window.py b/src/View/BoundaryCondition/Edit/Window.py
index 652aa22d41a082d33b16ab9a932a481a91e07d85..7f35759f99bd966624aa0a5ee4a33675eac6803d 100644
--- a/src/View/BoundaryCondition/Edit/Window.py
+++ b/src/View/BoundaryCondition/Edit/Window.py
@@ -18,33 +18,77 @@
 
 from tools import timer, trace
 
-from View.ASubWindow import ASubMainWindow
+from View.ASubWindow import ASubMainWindow, AWidget
 from View.ListedSubWindow import ListedSubWindow
 
 from PyQt5.QtGui import (
     QKeySequence,
 )
 
+from PyQt5 import QtCore
 from PyQt5.QtCore import (
     Qt, QVariant, QAbstractTableModel, QCoreApplication,
+    pyqtSlot, pyqtSignal,
 )
 
 from PyQt5.QtWidgets import (
     QDialogButtonBox, QPushButton, QLineEdit,
     QFileDialog, QTableView, QAbstractItemView,
     QUndoStack, QShortcut, QAction, QItemDelegate,
-    QHeaderView,
+    QHeaderView, QDoubleSpinBox, QVBoxLayout,
 )
 
 from View.Plot.MplCanvas import MplCanvas
 from View.Plot.navigation_toolbar_2qt import PamHyrNavigationToolbar2QT
 
 from View.BoundaryCondition.translate import long_types
+from View.BoundaryCondition.Edit.UndoCommand import SetMetaDataCommand
 from View.BoundaryCondition.Edit.Table import TableModel, ExTimeDelegate
 from View.BoundaryCondition.Edit.Plot import Plot
 
 _translate = QCoreApplication.translate
 
+class WD50Sigma(AWidget):
+    d50Changed = pyqtSignal(float)
+    sigmaChanged = pyqtSignal(float)
+
+    def __init__(self, parent=None):
+        super(WD50Sigma, self).__init__(
+            ui="d50sigma",
+            parent=parent
+        )
+        self.parent = parent
+
+        self.spinBox_d50 = self.find(QDoubleSpinBox, "doubleSpinBox_d50")
+        self.spinBox_sigma = self.find(QDoubleSpinBox, "doubleSpinBox_sigma")
+
+        self.spinBox_d50.valueChanged.connect(self.valueChangedD50)
+        self.spinBox_sigma.valueChanged.connect(self.valueChangedSigma)
+
+    def set_d50(self, d50):
+        self.spinBox_d50.valueChanged.disconnect(self.valueChangedD50)
+        self.spinBox_d50.setValue(float(d50))
+        self.spinBox_d50.valueChanged.connect(self.valueChangedD50)
+
+    def get_d50(self):
+        return float(self.spinBox_d50.value())
+
+    def set_sigma(self, sigma):
+        self.spinBox_sigma.valueChanged.disconnect(self.valueChangedSigma)
+        self.spinBox_sigma.setValue(float(sigma))
+        self.spinBox_sigma.valueChanged.connect(self.valueChangedSigma)
+
+    def get_sigma(self):
+        return float(self.spinBox_sigma.value())
+
+    @QtCore.pyqtSlot(float)
+    def valueChangedD50(self, value):
+        self.d50Changed.emit(value)
+
+    @QtCore.pyqtSlot(float)
+    def valueChangedSigma(self, value):
+        self.sigmaChanged.emit(value)
+
 class EditBoundaryConditionWindow(ASubMainWindow, ListedSubWindow):
     def __init__(self, title="Edit boundary condition",
                  data=None, study=None, parent=None):
@@ -63,6 +107,7 @@ class EditBoundaryConditionWindow(ASubMainWindow, ListedSubWindow):
         self.setup_sc()
         self.setup_table()
         self.setup_plot()
+        self.setup_data()
         self.setup_connections()
 
     def compute_title(self):
@@ -84,6 +129,17 @@ class EditBoundaryConditionWindow(ASubMainWindow, ListedSubWindow):
         self.copy_sc = QShortcut(QKeySequence.Copy, self)
         self.paste_sc = QShortcut(QKeySequence.Paste, self)
 
+    def setup_data(self):
+        self._is_solid = self._data.bctype == "SL"
+
+        if self._is_solid:
+            layout = self.find(QVBoxLayout, "verticalLayout_table")
+            self._d50sigma = WD50Sigma(parent = self)
+            layout.addWidget(self._d50sigma)
+
+            self._d50sigma.set_d50(self._data.d50)
+            self._d50sigma.set_sigma(self._data.sigma)
+
     def setup_table(self):
         table = self.find(QTableView, "tableView")
         self._table = TableModel(
@@ -138,6 +194,31 @@ class EditBoundaryConditionWindow(ASubMainWindow, ListedSubWindow):
 
         self._table.dataChanged.connect(self.update)
 
+        if self._is_solid:
+            self._d50sigma.d50Changed.connect(self.d50_changed)
+            self._d50sigma.sigmaChanged.connect(self.sigma_changed)
+
+    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 update(self):
         self.plot.update()
 
@@ -221,7 +302,9 @@ class EditBoundaryConditionWindow(ASubMainWindow, ListedSubWindow):
     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/ui/EditBoundaryConditions.ui b/src/View/ui/EditBoundaryConditions.ui
index 1fabe5fc870a517c42f024aa6836889eb8b69ebb..7f615964b58f66b85b2bfb96bd91ce39599be269 100644
--- a/src/View/ui/EditBoundaryConditions.ui
+++ b/src/View/ui/EditBoundaryConditions.ui
@@ -26,22 +26,22 @@
    <layout class="QGridLayout" name="gridLayout">
     <item row="0" column="0">
      <widget class="QSplitter" name="splitter">
-      <property name="sizePolicy">
-       <sizepolicy hsizetype="MinimumExpanding" vsizetype="Preferred">
-        <horstretch>0</horstretch>
-        <verstretch>0</verstretch>
-       </sizepolicy>
-      </property>
       <property name="orientation">
        <enum>Qt::Horizontal</enum>
       </property>
-      <widget class="QTableView" name="tableView">
-       <property name="minimumSize">
-        <size>
-         <width>0</width>
-         <height>200</height>
-        </size>
-       </property>
+      <widget class="QWidget" name="verticalLayoutWidget_2">
+       <layout class="QVBoxLayout" name="verticalLayout_table">
+        <item>
+         <widget class="QTableView" name="tableView">
+          <property name="minimumSize">
+           <size>
+            <width>0</width>
+            <height>200</height>
+           </size>
+          </property>
+         </widget>
+        </item>
+       </layout>
       </widget>
       <widget class="QWidget" name="verticalLayoutWidget">
        <layout class="QVBoxLayout" name="verticalLayout"/>
diff --git a/src/View/ui/Widgets/d50sigma.ui b/src/View/ui/Widgets/d50sigma.ui
new file mode 100644
index 0000000000000000000000000000000000000000..d1af908b9cd03702ac6042059fd5920f31f0ac7e
--- /dev/null
+++ b/src/View/ui/Widgets/d50sigma.ui
@@ -0,0 +1,70 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>Form</class>
+ <widget class="QWidget" name="Form">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>256</width>
+    <height>46</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <property name="locale">
+   <locale language="English" country="Europe"/>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="0" column="0">
+    <widget class="QSplitter" name="splitter">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <widget class="QWidget" name="">
+      <layout class="QHBoxLayout" name="horizontalLayout">
+       <item>
+        <widget class="QLabel" name="label_d50">
+         <property name="text">
+          <string>D50</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QDoubleSpinBox" name="doubleSpinBox_d50">
+         <property name="locale">
+          <locale language="English" country="Europe"/>
+         </property>
+         <property name="decimals">
+          <number>4</number>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+     <widget class="QWidget" name="">
+      <layout class="QHBoxLayout" name="horizontalLayout_2">
+       <item>
+        <widget class="QLabel" name="label_sigma">
+         <property name="text">
+          <string>Sigma</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QDoubleSpinBox" name="doubleSpinBox_sigma">
+         <property name="decimals">
+          <number>4</number>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>