Waste Storage Facility Volume (NRCS 313)
Waste storage volume by NRCS 313: manure, wastewater, bedding, precipitation, and freeboard.
Example
You enter
- Daily manure (ft3/day = head x rate) 150
- Added bedding (ft3/day, 0 if none) 20
- Storage period (days; under 120 flagged short) 120
- Surface area (ft2; for a roofed store keep it and zero the rain) 8000
- Net precipitation over period (in) 6
- 25-yr 24-hr storm depth (in) 4
- Freeboard (in: 6 vertical wall / 12 other) 12
You get
- Manure + wastewater + bedding volume 20400 ft3
- Precipitation + 25-yr storm volume 6667 ft3
- Freeboard volume 8000 ft3
- Total required storage 35066.7
Checked against published worked examples from: NRCS Conservation Practice Standard 313 / ASABE D384.
Details, formula, and sources
ScopeNRCS 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; under 120 days is flagged as short (CPS 313 sets the period by safe-application timing, not a fixed minimum). A planning aid, not the engineer of record.
Formula or tablemanure_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.
Source and editionNRCS Conservation Practice Standard 313 / ASABE D384 manure production, by name.
Free accessNRCS 313 and ASABE D384 are public standards; the engineer/planner of record governs the actual design.
What governsEstimate. AHJ and licensed professional govern.
API field namesdaily_manure_ft3, bedding_ft3, storage_days, surface_area_ft2, net_precip_in, storm_in, freeboard_in, manure_volume_ft3, precip_storm_ft3, freeboard_ft3, total_ft3
- Precipitation and storm an open facility banks net precipitation plus the 25-year, 24-hour storm on its surface over the periodNRCS Conservation Practice Standard 313
- Minimum storage / freeboard no fixed CPS 313 minimum; under 120 days flagged as short; freeboard 6 in vertical wall, 12 in otherNRCS 313