Class (catchment):
    name = "unknown_name"
    Number_of_SubAreas = "0"

    Class (SubArea):
        SubName = "Unknown_Name"
        Area  = "0.0"
        PercImperv = "0.0"
        Has_Watercourse = "Unknown"
        Has_Storage = "Unknown"
        Flows_to_Downstream = "Unknown"

        def Route_RUnoff():
            """
            Generate runoff from the Sub Area
            """

        Class (Watercourse):
            SubName = "Unknown_Name"
            WC_Label = "Unknown"
            Length = "0.0"
            Slope = "0.0"

            def ROute_Watercourse():
                """
                Route the flow along the Watercourse
                """

        Class (Storage):
            SubName = "Unknown_Name"
            Volume = "0.0"
            Flows_to_SubArea = "Unknown"

            def Route-Storage()
                """
                Route the FLow through a Storage
                """