Design example 102Waste stacking facility

Mr. Ralph Kilpatrick of Hoot Ridge, Kentucky, has requested assistance in developing a waste management system. He selected an alternative that includes solid manure storage for his 100 Holstein milking cows and 52 heifers. His nutrient management plan indicates the need for 90 days storage. He uses sawdust bedding for both the milking cows and the heifers. Because of space limitations the storage can be no wider than 50 feet. He would prefer that the facility be no more than 7 feet deep. The structure will not be roofed, so stacking above sidewalls will not be considered in design. Determine the necessary volume and facility dimensions using worksheet 10A-1.

Manure production—The animal descriptions, average weight, and numbers are entered on lines 1 and 2. The number of equivalent animal units for each animal type is calculated and entered on line 4. Daily manure production (line 4) is in table 4-5 in chapter z = _WL_

A waste storage structure for solids should be designed to withstand all anticipated loads. Loadings include internal and external loads, hydrostatic uplift pressure, concentrated surface and impact loads, water pressure because of the seasonal high water table, and frost or ice pressure.

The lateral earth pressure should be calculated from soil strength values determined from results of appropriate soil tests. If soil strength tests are not available, the minimum lateral earth pressure values indicated in the NRCS Conservation Practice Standard, Waste Storage Facility, Code 313, are to be used (NRCS 1995).

Timber sidewalls for storage structures should be designed with the load on the post based on full wall height and spacing of posts.

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