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Proper LP Inspection - Texas Onsite Wastewater Association

Proper LP Inspection - Texas Onsite Wastewater Association

Travis County Method

Travis County Method (~1999) • Design Method • Determine total length of trench to be installed • Trenches laid out with contour on topographic map of site • Elevation information should be accurate enough to determine ~0.2 feet of change in elevation • Divide trenches into groups of equal size (typically 1-2 groups on residential) • Trench lengths may vary; no advantage for all same length • Trenches >50’ in length should have center connection • Trenches should not exceed ~120’ total • Trenches connected by manifold or header pipe path to highest trench in each group

Travis County Method (~1999) • Select discharge hole size and use to estimate flow per foot (i.e. 5/32” ~ 0.1 gpm/ft) • Usual ‘best’ size is 5/32” – • Larger hole = bigger pump or excessive hole space • Smaller hole more likely to clog • Establish ‘fixed head loss’ for each group • Sum of discharge head in highest trench (usually 2’); elevation from pump to ground level at transmission connection to first trench; and selected head loss in pressure adjustment valve (4-6’); and a miscellaneous loss factor to cover minor unknowns

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