Logo Certified Nutrient Management Planning8-1 Module 8: Open Feedlot Construction and Management for Water and Air Quality Protection By Jeff Lorimor

Logo Certified Nutrient Management Planning8-2 Introduction Open feedlots are defined as confined areas that are devoid of vegetation or crop residue where animals are held for 45 days per year.

Logo Certified Nutrient Management Planning8-3 CAFO Definition Federal regulations define a Concentrated Animal Feeding Operation (CAFO) as a feedlot with capacity equal or exceeding:  1,000 beef animals.  700 dairy cows.  2,500 swine over 55 pounds.  Other species of EPA-defined sizes.

Logo Certified Nutrient Management Planning8-4 NPDES Permit CAFOS must obtain National Pollutant Discharge Elimination System (NPDES) permits. The permits:  Require capturing feedlot runoff.  Require pumping captured liquids onto crops.  Prohibit releasing runoff except in very large storms (25-yr, 24-hr storm).

Logo Certified Nutrient Management Planning8-5 Other CAFO Requirements Weekly inspection of storm water control devices Must have depth markers in containments Record-keeping requirements

Logo Certified Nutrient Management Planning8-6 Nearby Water Feedlots should not have streams running through them. Feedlots should not drain directly into streams, ditches, tile intakes, or other waterways leading directly to waters of the state.

Logo Certified Nutrient Management Planning8-7 Runoff Control and Management Complete containment  Contain all runoff in a basin below the lot.  To prevent overflow, land apply (irrigate) the liquids. Discharge systems  Useful for lots smaller than CAFOs  Release after settling solids in a manner that prevents water pollution.

Logo Certified Nutrient Management Planning8-8 Diversions Runoff control should start by diverting clean water away from the lot surface. Downspouts

Logo Certified Nutrient Management Planning8-9 Settling Solids All feedlots should have solids settling basins (debris basins) to capture solids from the feedlot runoff.

Logo Certified Nutrient Management Planning8-10 Settling Solids (continued) Solids settling basins do not store liquids permanently.  Liquid velocity is slowed, but the liquid is released.  State regulations may determine basin design. Porous outlets should be unplugged frequently to enhance liquid release. Solids should be removed frequently.

Logo Certified Nutrient Management Planning8-11 Nutrients are in Solids Most of the nutrients (> 90%) from open feedlots are found in the solids, not in runoff liquids.

Logo Certified Nutrient Management Planning8-12 Containment Structures Must have capacity to store runoff from the 25-yr, 24-hr storm  If inadequate capacity exists, pump out the containment. Maintain the structure in good condition.  Control erosion.  Eliminate rodents.  Keep mowed.  Maintain depth indicator gauge.  Keep accurate records.

Logo Certified Nutrient Management Planning8-13 Air Quality In Western states, dust and odor are bigger concerns than water quality. They are affected by the moisture content of the feedlot surface.  Too dry…dust results  Too wet…odor results In more humid regions, surface runoff is the primary concern.

Logo Certified Nutrient Management Planning8-14 Between 25%–40% Moisture is Optimum in a Feedlot

Logo Certified Nutrient Management Planning8-15 Corral Construction If possible, build on 3%-5% slopes. Avoid pen-to-pen drainage. Build mounds up and down the slope, not across the slope. Build mounds so cattle have access to them without going through a pothole. Provide convenient access for manure removal.

Logo Certified Nutrient Management Planning8-16 Properly Constructed Mounds Stay Dry

Logo Certified Nutrient Management Planning8-17 Open Lot Maintenance Proper maintenance is the most important factor in avoiding air and water quality problems with open lots. Pull blades are better than push blades for maintenance.

Logo Certified Nutrient Management Planning8-18 Make Mounds of Good Soil–Not Manure Mounds should run up and down, rather than across, the slope.

Logo Certified Nutrient Management Planning8-19 Open Lot Dust is a Function of Loose manure depth on the corral surface. The moisture content of the loose manure. Hoof action arising from cattle activity.

Logo Certified Nutrient Management Planning8-20 Corral Maintenance Keep the surface as hard, smooth, and dry as possible.  Minimize hoof prints that can hold water.  Scrape manure to maintain a 1"-2” base of manure above the soil surface.  Frequently inspect and fill holes and depressions.

Logo Certified Nutrient Management Planning8-21 Stocking density (animals per unit area). Animal bodyweight. Number of days on feed. Corral surface condition (e.g., wallows, “dust pots”). Manure harvesting frequency. Dust Emissions Loose manure depth is a function of…

Logo Certified Nutrient Management Planning8-22 Loose Manure Depth Deep and softThin and well compacted

Logo Certified Nutrient Management Planning8-23 Manure not yet harvested > 2” deep Manure harvested within previous 3 days < 1” deep

Logo Certified Nutrient Management Planning8-24 Manure Moisture Content

Logo Certified Nutrient Management Planning8-25 Moisture from Heat Control Sprinkling lots during hot weather can create wet conditions in humid areas. Sprinkle only intermittently. Locate sprinklers in areas that will not create potholes.  Sprinklers should provide 0.25”/day or more.  Patterns should overlap 50% of the diameter.  Do not sprinkle the feed apron.

Logo Certified Nutrient Management Planning8-26 Stocking Density Increased stocking density adds more moisture to the lot surface from cattle urination.  Texas research showed reduced Pm-10 emission at 75 sq ft/head vs. 150 sq ft/head. Other factors such as cattle performance are important in determining maximum density.

Logo Certified Nutrient Management Planning8-27 Manure Moisture Content Feed apron 1234 Water Trough High activity; High moisture Low activity; Low moisture

Logo Certified Nutrient Management Planning8-28 Dust Control Applying water to the feedyard surface, passively or actively, helps but is not a cure-all. Frequent manure harvesting (> 1 per turn) decreases water requirements and increases water effectiveness. Use the off-season to get ready. Prioritize within the yard and the corral.

Logo Certified Nutrient Management Planning8-29 Mortality Management for Odor Control  Limit exposure to the elements; use rapid rendering service pickup.  Compost.  Perforate or cleave thoracic cavity and cover carcass with 1'-2' of dry, organic material.  Burial is no longer acceptable in many states.

Logo Certified Nutrient Management Planning8-30 Summary Preventing water and air pollution from open feedlots starts with good lot design. Management and maintenance are the keys to ongoing pollution prevention.  Maintain smooth dry lots.  Adjust moisture and scrape carefully to minimize particulate and gas emissions.