Septic LPP Orifice Flow and Squirt Height
Per-orifice flow, total orifice count, and system flow for a low-pressure-pipe or mound distribution lateral via the orifice-discharge equation. Orifice size, spacing, and layout come from the permitted onsite design.
Formula and source
Per-orifice flow (gpm) = 19.63 x Cd x d_in^2 x sqrt(h_ft) (Cd 0.6 gives the familiar 11.79 coefficient); system flow = per-orifice flow x orifices per lateral x laterals.
Standard orifice-discharge equation; university onsite-wastewater extension low-pressure-pipe design guidance, by name.
Audience
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