Manure Storage Roof Savings (Covered vs Open)
The storage a roof buys back, the follow-on to manure-storage-volume: roof_saving = area x (net_precip + storm)/12 - the whole rainfall term an open pit must bank on its own surface. An 8,000 ft2 pit in a 10-in wet season saves 6,667 ft3 (~50,000 gal, a fifth of the facility); a 12,000 ft2 pit in a wetter climate saves 15,000 ft3 (~112,000 gal, a third). The saving is clean rainwater the operation also avoids hauling and spreading, so a roof pays back fastest where it rains most. A planning aid, not the engineer of record.
Formula and source
open = (daily_manure + wastewater + bedding) x days + area x (net_precip + storm)/12 + area x freeboard/12; roof_saving = area x (net_precip + storm)/12; covered = open - roof_saving; percent_saved = roof_saving / open x 100.
Manure storage covered-vs-open comparison (USDA-NRCS Conservation Practice 313 waste storage facility), by name.
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