![]() Since you don't know this elevation ahead of time, you need to assume one and be conservative. You need to start your cross-sections at an elevation that is higher than the 100-year flood elevation. The HEC-RAS manuals (both software and technical) are very descriptive. Make sure you have a cross-section at every widening, narrowing, bending, etc. When you've run your model, you should look at the error messages and add or interpolate cross-sections where it requires them. No, it doesn't matter how many bends a cross-section has, as long as it remains perpendicular to the direction of water flow. There are plenty of other threads that cover HEC-RAS cross-section selection.
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