HN Explorer

I'm a new land surveyor. How do find the formulas for this table? (i.imgur.com)

1 points by aspiring ↗ HN
This example is used to figure the cubic feet of fill used in a proposed pond. Further down the table I would multiply the total cubic feet by 2 and divide it by 54 to find the total cubic yardage of fill needed for the proposed dam.<p>This is the link to the rest of the table:<p>http://i.imgur.com/JtJRIww.jpg

3 comments

[ 3.4 ms ] story [ 16.9 ms ] thread
aspiring
This example is used to figure the cubic feet of fill used in a proposed pond. Further down the table I would multiply the total cubic feet by 2 and divide it by 54 to find the total cubic yardage of fill needed for the proposed dam.

This is the link to the rest of the table:

http://i.imgur.com/JtJRIww.jpg

bavcyc
No you would not multiply the total cubic feet by 2 and divide by 54 to find the total cubic yards. If you multiply by 2 then you will throw your calculations off.

The table is figuring a cross sectional area then adding the next cross section area. At that stage it should divide by 2 to find the 'average' area for a section but it waits until the end to do this by dividing by 54 (or double the cubic feet in a cubic yard).

A1 = H1 x W1 A2 = H2 x W2 (A1 + A2) x L1 = 2V1 (approximate) A3 = H3 x W3 (A2 + A3) x L2 = 2V2 ... sum of volumes = 2V approximate volume = 2V / 54 = approximate cubic yards.

[deleted]
(comment deleted)