Sump is 8-9' below grade?
Would need to have an understanding of the soils between the seasonal pond and the house. It is possible that water is getting trapped between the house/sump and the pond but without knowing what the soils are there's really no way to say if that is occurring.
I am no expert though I have worked on a couple of projects where water was getting in someplace it wasn't supposed to.
1.5acre LMB, YP, BG, RES, GSH, Seasonal Tilapia I subscribe to Pond Boss Magazine
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