Thursday, December 11, 2008

Little known secret...

Written by Chris Goodell, P.E., D. WRE | WEST Consultants
Copyright © 2008. All rights reserved.

I usually get a huge "AWESOME!" when I share this simple, but not well known trick in HEC-RAS.

In any graphical plot in HEC-RAS, hold down the control key and look what happens to the cursor. I changes from a pointer to a "cross-hairs" with a measuring square. You have just put yourself in "measuring" mode. With this you can click and drag a line, and RAS will tell you the dx, dy, total length, and the slope, dy/dx. If you draw a polygon, it will give you the polygon area. Great for getting bed slopes off of profile plots. I also use it for measuring main channel widths on cross section plot, and for measuring reach lengths on a georeferenced schematic.

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