I have also tried to manually change the statioing of the XSs in the. geo file but the drawing and table data in HEC RAS are unchanged. I have tried to reverse the alignment stationing in Civil 3D (Fig 2), and created a new. The issue is more than just cosmetic - table for reach length confirms that the most upstream station is 116.6 and the most downstream is 12.94, which is in contradiction with the reach arrow in the drawing. However, the stationing seems to be reflecting the Civil 3D set up which is awkward for HEC-RAS given the flow n HEC-RAS is always from higher stationing to lower.

Flow direction arrow in the drawing in HEC-RAS geometric editor (Fig 3) seems to be consistent with Civil 3D (left to right, 0+12.94 (U/S) to 0+116.6 (D/S)). As the attachment will show something went wrong somewhere as indicated by a discrepancy between geometric editor and the reach length table in HEC RAS:įlow direction in Civil 3D is from 0+12.94 (U/S) to 0+116.6 (D/S) (Fig 1).

Took a dig at exporting a fictional river reach modeled in Cvil 3D 2011 to HEC RAS.

Civil 3d hec ras