The following topic describes how various LandXML element attributes are mapped to their Bentley SewerGEMS counterparts.

LandXML Import

Structs

Structs are either imported as Transitions or Gravity Junctions depending on the following subelements it contains.

• Struct.Connection > Becomes a CrosSection
• Struct.RectStruct > Becomes a rectangular gravity junction whose shape parameters are based on:
• Struct.CircStruct > Becomes a circular gravity junction whose shape parameter is based on:

Pipes

All pipes are brought in as gravity conduits.

LandXML Export

Catchments

Ponds are ignored.

Gravity Junction (CatchBasins or Manholes)

• Circular > Struct.CircStruct
• Box > Struct.RectStruct
• Elevation (Invert) > Struct.elevSump
• Elevation (Rim) > Struct.elevRim
• Hydraulic Grade Line (In) > Struct.StructFlow.hglIn
• Hydraulic Grade Line (Out) > Struct.StructFlow.hglOut

CrossSection > Struct.Connection

• Elevation (Invert) > Struct.elevSump
• Elevation (Top) > Struct.elevRim
• Hydraulic Grade Line > Struct.StructFlow.hglIn
• Hydraulic Grade Line > Struct.StructFlow.hglOut

PondOutletStructure > Struct.Connection

• Elevation (Invert) > Struct.elevSump
• Elevation (Top) > Struct.elevRim
• Hydraulic Grade Line > Struct.StructFlow.hglIn
• Hydraulic Grade Line > Struct.StructFlow.hglOut

Outfall > Struct.OutletStruct

• Elevation (Rim) > Struct.elevRim
• Elevation (Invert) > Struct.elevSump
• Hydraulic Grade Line > Struct.StructFlow.hglIn
• Hydraulic Grade Line > Struct.StructFlow.hglOut

Wet Well > Struct.Connection

• Elevation (Minimum) > Struct.elevSump
• Elevation (Maximum) > Struct.elevRim
• Hydraulic Grade Line > Struct.StructFlow.hglIn
• Hydraulic Grade Line > Struct.StructFlow.hglOut

Tap > Struct.Connection

• Elevation Connection (Tap) > Struct.elevRim

Conduit

• Start ID > Pipe.refEnd
• Stop ID > Pipe.refStart
• Length (Unified) > Pipe.length
• Slope > Pipe.slope
• Circular > Pipe.CircPipe
• Ellipse > Pipe.ElliPipe
• Rectangular > Pipe.RectPipe
• Trapezoidal > Pipe.Channel
• Flow > Pipe.PipeFlow.FlowIn
• Hydraulic Grade Line (In) > Pipe.PipeFlow.hglUp
• Hydraulic Grade Line (Out) > Pipe.PipeFlow.hglOut

Channels are exported as trapezoidal conduits

Lateral links are exported as conduits

Gutters are ignored.

Pressure Pipes are not supported

• Pump > Struct.Connection
• Units