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NRCS Procedures for Structural Design

NRCS Procedures for Structural Design. Jeff Crislip, P.E., Ag Engineer, NRCS, Carbondale. Design Standards for Earthen Waste Storage Structures.

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NRCS Procedures for Structural Design

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  1. NRCS Procedures for Structural Design Jeff Crislip, P.E., Ag Engineer, NRCS, Carbondale

  2. Design Standards for Earthen Waste Storage Structures • Earthen Waste Storage Structures shall be designed according to NRCS Conservation Practice Standard 359 - Waste Treatment Lagoon and regulations set forth in the Illinois Department of Agriculture – Livestock Management Facilities Act. • Important Design Criteria: 1. Facility must store manure, wastewater, precipitation minus evaporation, depth of 25-year, 24-hour storm on the surface area, runoff from 25-year, 24-hour storm from contributing area. 2. The minimum elevation of the settled embankment shall be 1 foot above the lagoon’s required volume (i.e. 1 foot freeboard). 3. Side slopes shall not be steeper than 2H:1V. 4. The maximum operating level shall be the lagoon level that provides the required volume less the 25-year, 24-hour storm event. The maximum drawdown level shall be the lagoon level that provides the volume of manure, wastewater, clean water, and accumulated sludge. A marker shall be installed indicating these levels. 5. A clay liner may need designed with a thickness and permeability so that specific discharge is less than 1 X 10-7 cm/sec or 3.15 ft/year. 6. No lagoon shall be constructed within the floodway of a 100-year floodplain.

  3. NRCS Procedures for Structure Design • Conduct soil borings as required, including permeability testing • Using the required specific discharge, calculate liner depth (thickness) to meet permitting requirements • If seasonal high water table is present, design perimeter drainage system to avoid uplift pressures on liner • Design structural measures to avoid damage to liner during agitation, filling (pipe outlets) or emptying, AND erosion damage after construction but before filling

  4. After Construction Liner Testing • NRCS will test the liner to ensure that it will comply with regulations prior to placing the lagoon into service. • The in-place density will be compared to proctor density curves to determine if proper compaction has been achieved. • Moisture content of liner must have allowed for proper density (i.e. – 95% standard proctor density). • Typically, NRCS uses the rubber-balloon method for determining in-place density. See illustration on next slide. • NRCS will provide the operator with documentation stating the liner meets compaction requirements. The operator will then provide this information to the State of Illinois.

  5. Rubber-Balloon Apparatus

  6. Equal Opportunity The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD).

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