Feedlot Runoff Management By John Andrews, P.E., State Conservation Engineer 10/16/02 NRCS, Lakewood, CO.

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Presentation transcript:

Feedlot Runoff Management By John Andrews, P.E., State Conservation Engineer 10/16/02 NRCS, Lakewood, CO

2 Feedlot Runoff Management Intended Outcomes After this session, the participants will:  Recognize sources of contaminated runoff.  Be aware of feedlot site selection factors.  Understand the features and benefits of common feedlot runoff control practices. “Runoff control undoubtedly constitutes the single most important technology available to the feedlot industry for preventing discharge to navigable waters of the United States.” (EPA, 1974)

3 Feedlot Runoff Management Runoff Happens... Runoff will occur when the depth of snowmelt or rainfall exceeds about 0.5 inches.inches

4 Feedlot Runoff Management Ft. Collins Rainfall Data Period of Record ,106 Days of Data 8,521 measurable precipitation events (22%) 821 events > 0.5 inches 90 events > 1.54” or 2yr design storm 4 events > 3.54” or 25yr design storm

5 Feedlot Runoff Management Frequency of Feedlot Runoff Events at Ft. Collins, CO. Period of Record During no year on record has Ft. Collins received zero feedlot runoff events.

6 Feedlot Runoff Management Runoff Characteristics

7 Feedlot Runoff Management Runoff Management Principles I.Minimize Runoff Volume II.Collect Runoff (so it can be managed) III.Separate Solids (decrease management challenges) IV.Store Liquids (until needed) V.Land Apply Liquids at Agronomic Rate

8 Feedlot Runoff Management Runoff Management Principles I.Minimize Runoff Volume  Good site location.  Keep “clean” water clean (divert run-on).  Clean lots regularly.  Grade flat lots to drain.  Reduce manure movement off steep lots.

9 Feedlot Runoff Management Runoff Management Principles Minimize Runoff Volume Good Site Location  Locate lots to minimize “runon”  Lots slope at 2% to 5%  On soils w/ > 25% clay content

10 Feedlot Runoff Management Click on box to the right to play video clip

11 Feedlot Runoff Management Runoff Management Principles Other Location Requirements  Room for runoff collection & storage (about 1 acre for 100 to 200 AUs)  Setback >150’ from water courses & wells  Adequate distance from neighbors

12 Feedlot Runoff Management Runoff Management Principles Minimize Runoff Volume Keep clean water clean  Divert “clean” runoff away from feedlot  Exclude roof water  > 5% of total drainage area  Collection channels along foundation  Roof gutters & outlet piping  Fix leaking water tanks  Minimize use of “flow through” tanks

13 Feedlot Runoff Management Runoff Management Principles Minimize Runoff Volume w/ Appropriate lot size (from Murphy & Harner, 2002)

14 Feedlot Runoff Management Runoff Management Principles Clean Lots Regularly  Each time a pen is turned  Monthly is better * Leave 1” to 2” packed manure seal * Clean under fences * Pulling better than pushing (e.g. use a box scraper or rear mounted blade)

15 Feedlot Runoff Management Runoff Management Principles Flat Lots Need Drainage  Build mounds  Install collection channels  Fill low spots that pond runoff

16 Feedlot Runoff Management Click on box to the right to play video clip

17 Feedlot Runoff Management Runoff Management Principles Mounds...  Add slope to a flat lot  Provide windbreak & warming area  Serve as a low tech compost pile

18 Feedlot Runoff Management Cross Section of a Feedlot Mound Provide about 30 sq.ft. per AU per side (from Murphy & Harner, 2002)

19 Feedlot Runoff Management Single Row Feedlot Design (from Murphy & Harner, 2002) Click on box to the right to play video clip

20 Feedlot Runoff Management Runoff Management Principles Steep Lots Need...  Roads & channels aligned on the contour  More frequent cleaning  Consider terraces or other erosion control practices  Buffers between lot & area below it

21 Feedlot Runoff Management Click on box to the right to play video clip

22 Feedlot Runoff Management Runoff Management Principles Managed runoff from these areas too:  Manure Stockpiles  Composting Areas  Snow Piles  Silage Pit

23 Feedlot Runoff Management Runoff Management Questions Can you divert runoff away from the pens? What is the slope of your feedlot? –Is the lot too flat to drain rainfall runoff? –Are there low areas that pond water on the lot? –Is the lot so steep that gullies form, or manure piles at bottom? Are your pens bigger than they need to be? How frequently do you collect manure? Do you leave a thin manure layer to seal the surface? How do you handle snow? How will you collect and manage feedlot runoff?

24 Feedlot Runoff Management Typical Feedlot Components

25 Feedlot Runoff Management Two Basic Types of Runoff Control Options Containment Discharge

Feedlot Runoff Control Alternatives Based on Pounds of N in the Runoff Total Annual N in Runoff, lbs Containment SystemsVegetative Systems Lagoon Holding Pond Evaporation Pond Wetland Infiltration Field Grass FilterTerrace <100 (<2 Acres)* XXXXXXX ( Acres)* XXXXXX 500-1,000 ( Acres)* XXXXX 1,000 – 4,000 ( Acres)* XXXX >4,000 (> 70 Acres)* XX (from Murphy & Harner, 2002) * ~ 50 lbs. per acre of feedlot in Colorado

Feedlot Runoff Control Alternatives Based on Water Surface Evaporation. XXXX< 30 XXXXX30 – 45 XXXXXX45 – 60 XXXXX> 60 Terrace Grass filter Infiltration field Wetland Evaporation pond Holding pondLagoon Vegetative SystemsContainment SystemsFree Water Surface Evaporation inches (from Murphy & Harner, 2002)

Controlling runoff from AFOs with a sediment basin discharging into vegetative system using filter strips or wetland cells. Confined Feeding Pens Sedimentation Channel/Basin

Controlling runoff from AFOs or CAFOs using a conventional total containment structure such as a holding pond or evaporative pond. Confined Feeding Pens Sedimentation Channel Holding or Evaporative Pond

30 Feedlot Runoff Management The size of a vegetative system is based on hydraulic characteristics, crop nutrient use, and the water holding capacity of the soil.

31 Feedlot Runoff Management In some watersheds, phosphorus (P) may be the limiting nutrient rather than N, and thus the crop uptake of P becomes the design-limiting nutrient.

32 Feedlot Runoff Management Holding ponds or lagoons are commonly used for operations greater than 300 AUs or where space is limited.

33 Feedlot Runoff Management The costs of controlling the runoff from existing facilities must be weighed against new lot construction on an alternative location. Renovation vs. New Construction Producers constructing new facilities need to address current regulations and also design for compliance with future regulations.

34 Feedlot Runoff Management References Davis, J.G., T. Stanton & T. Haren Feedlot Manure Management. CSU Extension Bulletin Colorado State University. Ft Collins, CO. EPA Feedlots - EPA-440/ Environmental Protection Agency, Washington, D.C. EPA Manure Harvesting Practices: Effects on Waste Characteristics - EPA-600/ Environmental Protection Agency, Office of Research & Development, Ada, OK. Miner, J.R., F. Humenik, and M. Overcash Managing Livestock Waste to Preserve Environmental Quality. Iowa State University Press. Ames, IA. Murphy, P. and J. Harner Open Lot Runoff Management Options; Lesson 22, Livestock and Poultry Environmental Stewardship Curriculum. Midwest Plan Service, Iowa State University. Ames, IA. MWPS Livestock Waste Facilities Handbook, 3rd Ed. Midwest Plan Service, Iowa State University. Ames, IA. NRCS Agricultural Waste Management Field Handbook. USDA Natural Resources Conservation Service. Washington, D.C.