Hello from northeast Texas (north of Jefferson), NRCS office doesn't engineer for over 80 acres of drainage into proposed pond area, but he sent a flow chart for my area(378 acres). You maybe able to adjust to your acreage so you have a flow rate going into your pond.
I'm not sure what I'll do with mine yet. Probably will dig out s bend in wet weather creek so I can check for clay & 1st have a pool to pump from.
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I've got 2 places(Lone Oak&eTex).Terraces will catch rain in hilly country in eTex.4 or 5 locations. In LO, hoping to enlarge to 4 acres of ponds,have bass & catfish separately. Selling one would speedup work on the other. Hard decision on which smile