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tutorial microstation civil engineering ss4 cross sections alignment digital terrain model geopak corridor modeler template drop open roads openroads channel hydraulics scour horizontal and vertical constraints arcgis shp terrain hecras constrained template external references 3d visualization feature definitions simple lesson point control templates parametric constraint guide superelevation superelevation flag hec 18 stream stability bridge pier highway design abutment debri oxbow lakes procedure velocity lidar ss3 hec-ras research mxd interoperability dtm comparison design esri tin 3d dgn company profiles complex by element graphical editing child equivalent parent corridor surface assembly water resources hydrocad subcatchment review reach link routing node report rainfall watershed hydrography curve number inputs flow volume hydrograph scs storage indication dynamic storage indication brief guide parent components end condition feature labeling constraint label discussion inroads vertical accudraw line between points line to element line from element line between arcs chamfer between elements circle arc between points simple arc from element single offset entire element add station equation autodesk civil 3d autocad cad layers levels cells blocks style