Waste Storage Facility Volume (NRCS 313)
NRCS 313 waste storage sizing: total = (daily manure + wastewater + bedding) x storage_days + area x (net precip + 25-yr storm)/12 + freeboard. An uncovered pit must bank the rain and the 25-year storm on its own surface, or it overtops in a wet spring; minimum storage 120 days. A planning aid, not the engineer of record.
Formula and source
manure_volume = (daily_manure + wastewater + bedding) x storage_days; precip_storm_volume = surface_area x (net_precip + storm) / 12; freeboard_volume = surface_area x freeboard_in / 12; total = the sum.
NRCS Conservation Practice Standard 313 / ASABE D384 manure production, by name.
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