Bed Sizing Worksheet (1-60 MPI)
1.
AES or ES Pipe Required - Table A
Using Table A determine the linear footage of AES pipe
required for the daily design flow and the site’s
percolation rate (mpi).
2.
Determine Row Spacing - Table B
Determine the minimum Row Spacing based on the
System Slope and the Site's perc rate and is never less than
1.5 ft. All sloping beds must be designed as mounds.
3.
Min. System Sand Bed Area - Table C
Using Table C, find the System Sand Bed Area using the
Daily Flow and the Site's Perc rate.
Table C already incorporates the state approved reduction
in dispersal area. No further reductions allowed.
Flow = _____________
Pipe Required:
Perc = _____________
System Slope = _____%
Min. Row Spacing:
Perc = ____________
Flow = _____________
Perc = _____________
Sand Bed Area Req'd:
4.
Select Row Length, Find # of Row & Layout Width - Table D
a) Select a row length that the site will accommodate in the far left column.
b) Move to the right of that row length until the minimum amount of pipe is found.
Row Length:
________________
Number of Rows:
c) Now move down that column to find the number of rows required.
________________
d) Continue down that column to find the "Pipe Layout Width" for your row spacing.
Pipe Layout Width:
Table D shows row lengths in five foot increments, however the pipe may be cut
to any length.
5.
Verify System Sand Bed Area - Adjust if Necessary
________________
Sys. Sand Bed Length:
a) Sys. Sand Bed Length = Row Length + 2 ft. = ______________________________
________________
b) Sys. Sand Bed Width = Pipe Layout Width + 2 ft. + (3 ft. Sys. Sand Ext. if System
Slope is over 10%) = _______________________________________________
Sys. Sand Bed Width:
c) Sys. Sand Bed Area = a x b = ___________________________________________
d) Verify area is equal to or greater than Table C requirements. Increase row length or
row spacing as needed. ______________________________________________
Notes:
________________
Sys. Sand Bed Area:
________________