`d = ( 0.25 /(12."in"))* "R" + "W" + "x" `

Enter a value for all fields

The Pipe Grade calculator computes the depth at the end of a trench needed for a pipe to be laid with a desired grade.

INSTRUCTIONS: Choose units and enter the following:

• (G) Drop per 12" (e.g., 1/8" = 0.125  1/4" = 0.25)
• (R) Run of Pipe
• (W) Outer width of the pipe
• (x) Adder

Depth of Trench (D):  The calculator returns the depth in inches.  However, this can be automatically converted to compatible units via the pull-down menu.

The Math

The depth (d) of the fall is a function of the Run (R) and the grade (G):

         d = G/(12 inches) *R

where:

• d = vertical displacement
• G = grade in inches drop per foot
• R = horizontal displacement

The end depth of the trench is:

          D = d + W + x

where:

• D = Depth of Trench
• d = drop over the run
• W = outer diameter of the pipe
• x = adder for fittings

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