Page 140 - Nutrient Management Planning Guide

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Estimating Manure Inventory

Side 1

Side 2 = 6.2 m

70°

A

B

Hypotenuse = 6.6 m

Ground level

Level

B

1

B

2

A

1

A

2

Ground level

Level

90°

A = A

1 2

B = B

1 2

90°

Manure

70°

Estimating Height of Manure in an Earthen Manure Storage

The measured slope along the wall of an earthen manure storage facility is 70º, and the length of the sloped wall is 8.7 m. The length of freeboard is 2.1 m. The height of manure in the facility is:

Calculated slope angle = 90 ° - measured slope angle = 90 ° - 70 °

= 20 ° is the calculated slope angle of the wall from the vertical Cosine factor of 20° is 0.9397, from Table 4.1.5.

The height of manure =‘cosine’ of calculated slope angle x (length of sloped wall-length of freeboard) = 0.9397 X (8.7 m – 2.1 m) = 0.9397 X 6.6 m

= 6.2 m is the height (depth) of the manure in the storage

Figure 4.1.14 Using a Board to Estimate the Angles of the Manure Storage Wall to Estimate the Depth of the Manure in the Storage.