Page 143 - Nutrient Management Planning Guide

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Chapter 4.1

Calculate Volume of Manure in Storage

Once the facility dimensions are known, the volume of manure in the facility can be calculated.

Calculating Volume of Manure in an Earthen Manure Storage

Figure 4.1.16 shows the dimensions of a manure storage facility. The volume of manure in this earthen manure storage facility can be calculated using these dimensions.

Figure 4.1.16 Liquid Storage Facility with Estimated Dimensions

The base surface area of the facility is calculated as:

Base Surface Area (A

base

) = length of base x width of base = 24.0 m x 18.0 m

= 432 m 2 is the estimated base surface area of the storage facility

The upper surface area of the manure is calculated as: Upper Surface Area (A

manure

) = length of the top of the manure x width of the top of the manure = 28.5 m x 22.5 m

= 641 m 2 is the upper surface area of the manure in the facility

The volume of manure is calculated using the answers from the two equations above, and is as follows: Manure volume (m 3 ) = height

manure

× [A

base

+ A

man

+ √(A

base

× A

man

)] ÷ 3 = 6.2 m × [432 m 2 + 641 m 2 + √(432 m 2 × 641 m 2 )] ÷ 3 = 6.2 m × [1,073 m 2 + √(276,912 m 4 )] ÷ 3 = 6.2 m × [1,073 m 2 + 526 m 2 ] ÷ 3 = 6.2 m × 1,599 m 2 ÷ 3 = 9,915 m 3 ÷ 3

= 3,305 m 3 is the estimated volume of the manure in the storage

The volume of manure can be converted into litres (L) (or any other measurement) using the conversion factors in Table 4.1.3.

Manure volume (L) = 3,305 m 3 × 1000 L/m 3

= 3,305,000 L is the approximate volume of manure