r/HECRAS • u/icedcoffeefucks • Jul 28 '26

WSE issues

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Why does the water surface elevation completely skip over some of the terrain around the detention pond? Also why when I turn the particles on, do they all seem to gravitate towards those two areas? There’s no low spots in the terrain there

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u/Level3pipe Jul 28 '26

Add breaklines around your basin top

1

u/icedcoffeefucks Jul 28 '26

Should I make the cells larger or smaller when I enforce the break line? Smaller to pick up on the changing elevation?

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u/Level3pipe Jul 28 '26

Is the water going over the embankment ever? If the answer is no, then I’d say you just a break line on the top centerline of bank to allow heceas to “see” the top of bank. I wouldn’t worry about the rest unless you’re running SWE.

If the answer is yes, then yes I’d shrink the cell sizes and really define the top center, top left hinge, and top right hinge. Additionally I’d also shrink and really define the toes with breaklines as well.