Page 141 - Nutrient Management Planning Guide

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Chapter 4.1

Width and Length of the Facility Base

The width and the length of the facility base can be estimated using the length and slope angle on the storage facility walls.

The width of the base is calculated as:

Base width = top width – 2 (‘cosine’ factor of the measured slope angle x length of sloped wall)

Similarly, the length of the base is calculated as:

Base length = top length – 2 (‘cosine’ factor of the measured slope angle x length of sloped wall)

Calculating Width and Length of a Facility Base

A storage facility has a top width of 24 m and a length of 30 m. The facility walls have a measured slope angle of 70º and a length of 8.7 m. The width of the base is estimated by:

Base width (m) = top width – 2 (‘cosine’ factor of the measured slope angle (Table 4.1.5) x length of sloped wall) = 24 m – (2 x (0.3420 x 8.7 m)) = 24 m – (2 x 2.98 m) = 24 m – 5.96 m

= 18.0 m is the estimated base width of the storage facility The length of the base is estimated by:

Base length (m) = top length – 2 (‘cosine’ factor of the measured slope angle (Table 4.1.5) x length of sloped wall) = 30 m – (2 x (0.3420 x 8.7 m)) = 30 m – (2 x 2.98 m) = 30 m – 5.96 m

= 24.0 m is the estimated base length of the storage facility

Width and Length of the Manure Surface in Storage

To estimate width and length of the top surface of the manure use the exact same calculations as those used to estimate the width and length of the base of the storage facility. Rather than using the length of the facility wall, use the difference between the length of the facility wall and the length of the freeboard.

These calculations assume that the angle and length of the sloped walls of the facility are the same for all walls. If this is not the case, measurements will need to be collected for each wall.

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