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Why are my storm estimates so low in Pondmaker?

I am currently designing a basin in Pondmaker. Everything goes smoothly until I run my outlet design. When I do, the program estimates my storm elevations at a very low depth as seen in the first picture below. I then continue to route the storms through my pond, and the elevations immediately jump up (as seen in the second photo). My question is how can I get the program to accurately estimate the storm elevations?