Hi,

To create a rating curve in hec-ras you need to input channel cross
sections and flow or water levels (depending on the flow type) at the
upstream and/or downstream. You can produce rating curves for any cross
section you input into the program or for any interpolated sections in
between. Your best way to learn how to do this is to open one of the
samples and see how these data are input. It's simple and easy.

Soran Sito
ssito@sympatico.ca