Abstract

Drainage pipe effluent is frequently analyzed to determine the water composition to address nutrient or contaminant transport. The total effluent volume must be known in order to determine the total nutrient or contaminant discharge. These estimates of total effluent volumes may be accomplished with flow meters; however, equipment and labor costs may be prohibitive and a qualitative method may be a practical alternative. This manuscript outlines a mathematical approach for employing Manning's formula; in which, the cross-sectional area and wetted perimeter of partially filled conduits are determined using measurements of the pipe internal diameter, the maximum depth of water in the pipe, and the coefficient of roughness. Field observations indicate that the method is a qualitative estimate of water effluent and is accurate for field approximations; however, field calibration is warranted.

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