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Typical ponding basin 3:1 inside and outside banks. 14' wide operating road on top.
When I run stage storage I get contours on both inside and outside banks. I only really need them inside the pond. I have to delete the outside grading then run the app. Is this the only way (quick) to get what i'm after
When you define the basin are you selecting "from surface contours" or "from polylines"? If you select from surface contours this will take into account the entire basin based off the surface created from the gradings. After you do that, you can go back and select the individual contours as polylines and define your basin that way.
Does that help?