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Relevant equations and method for calcing Otis, 1981 charts on pressure dist. lateral diameter

Relevant equations and method for calcing Otis, 1981 charts on pressure dist. lateral diameter

Relevant equations and method for calcing Otis, 1981 charts on pressure dist. lateral diameter

(OP)
I would like to build a spreadsheet that allows me to calculate the minimum lateral size for a pressure distribution type drainfield. Essentially derive the values that Otis, 1981 presents in graphs for lateral diameter depending on orifice size and spacing, and lateral length. I know it's easy enough to look at the chart, but I would like to know how it is calculated. I would assume it is related to the orifice discharge equation and hazen-williams equation but I can't seem to get any farther than that.

Can anyone walk me through the calcs?

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