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Proper LP Inspection - Texas Onsite Wastewater Association

Proper LP Inspection - Texas Onsite Wastewater Association

Logic Flaws in NCSC 1982

Logic Flaws in NCSC 1982 Method • Pumps operate anywhere below curve • Pumps can ONLY operate on the curve; artificial/increased head required to reach curve • Head loss in manifold between trenches is ignored • Can be used to control head within a group (zone) • Elevation changes of less than ½ foot between trenches ignored • Actual elevation change is important to an accurate calculation of discharge pressure • Supply/Transmission line connection to drainfield location does not matter • Connection Location is critical to improved method of calculation • Calculated flow rate is presented as actual flow rate • Not an accurate assumption

Travis County Method (~1999) • Rational for Method • Pump selection determines hole spacing by virtue of flow • Pump selection is based on hydraulic characteristics of the piping system • From pump to connection to drainfield at highest trench including all fittings, valves, meters, etc. • The pump is selected based on a point ON the curve. Result: More efficient use of selected pump or the selection of smaller, less expensive pump

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