Ohio State University Extension Bulletin

Mound System:
Pressure Distribution of Wastewater
Design and Construction in Ohio

Bulletin 829


Pressure distribution design worksheet

1. Information for household
Bedrooms 
Persons 
Estimated daily wastewater flowgal/day
2. Distribution area configuration
Width of distribution areaft
Length of distribution areaft
3. Lateral design
Length of lateralft
Distance between lateralsft
Total numbers of laterals 
Manifold type 
Hole diameterinch
Total number of holes in distribution area 
Number of holes per lateral 
Hole spacing in lateralsft
Lateral diameterinch
Head at end of lateralft
Flow rate per holegal/min
Flow rate per lateralgal/min
4. Manifold and main design
Connection between the manifold and lateral 
Connection between the main and manifold 
Length of manifoldft
Manifold diameterinch
Main diameterinch
System flow rate (GPM)gal/min
5. Configuration of mains
Static liftft
Head losses in main and fittingsft
Network lossft
Total dynamic head (TDH)ft
6. Pump selection by GPM/TDH
Pump capacity 
7. Dosing chamber design
Volume drains through the holes (for laterals)gal
Volumes drain back to the dosing tank
(laterals + manifold + main)
gal
Dose volumegal
Size of dosing chambergal
8. Pump installation in dosing tank with level switch
Tank shape 
Tank diameterinch
Switch separationinch

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