River: Add a default sediment layers.

src/Model/River.py

@@ -378,6 +378,7 @@ class River(Graph, SQLSubModel):
 
     def init_default(self):
         self.init_default_network()
+        self.init_default_sediment()
         self.init_default_additional_files()
 
     def init_default_network(self):
@@ -386,6 +387,20 @@ class River(Graph, SQLSubModel):
 
         e = self.add_edge(n1, n2)
 
+    def init_default_sediment(self):
+        sediment = self._sediment_layers
+        default = sediment.new(0)
+        default_0 = default.new(0)
+
+        default.name = "default"
+        default.comment = "Default sediment layers"
+
+        default_0.name = "L0"
+        default_0.height = 1.0
+        default_0.d50 = 0.002
+        default_0.sigma = 1.0
+        default_0.critical_constraint = 0.047
+
     def init_default_additional_files(self):
         add_file = self._additional_files.new(0)
         add_file.name = "Pamhyr2 stamp file"