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This bulletin describes a recommended procedure to measure soil saturated hydraulic conductivity (Ks) with a borehole permeameter and convert this value to estimates of percolation rate for on-site wastewater treatment systems. Saturated hydraulic conductivity is a fundamental hydraulic parameter for soil water flow and it is defined as the ratio of the water velocity to the hydraulic gradient. This bulletin also provides information on a computer-based program to help calculate saturated hydraulic conductivity.

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Our Experts

Gary Hawkins

Associate Professor – Water Resource Management

Jessica Brown

Stormwater Specialist

Status and Revision History

  • Published on March 3, 2025