Showing beneficial use is actually pretty easy. One of the uses for both the ponds I plan on putting on the top of the leveled off hills, should they exceed 20 acre feet, is fire protection/suppression. I already plan on having 6" or larger pipe with valves coming from the bottom of those ponds and having lines to sprinkler systems for that purpose (Gravity feed from 70' above the rest of the property)... the high desert tends to burn easily! Another valid use I'll have for any and all ponds is wildlife support. Putting some stock on the place would also qualify. Irrigation for cash crops is another use that qualifies.