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Percolation test results are not readily translated into field saturated hydraulic conductivity (K<sub>fs</sub>). However, an acceptable approximation can be made by accounting for the soil texture and by making measurements under non-saturated conditions<ref>Reynolds, W.D., Galloway, K., and Radcliffe, D.E. (2015). "The relationship between perc time and field-saturated hydraulic conductivity for cylindrical test holes.", National Onsite Wastewater Recycling Association (NOWRA) 2015 Onsite Wastewater Mega-Conference, Virginia Beach, VA, USA, November 3-6, 2015</ref>.
Percolation test results are not readily translated into field saturated hydraulic conductivity (''K<sub>fs</sub>''). However, an acceptable approximation can be made by accounting for the soil texture and by making measurements under non-saturated conditions<ref>Reynolds, W.D., Galloway, K., and Radcliffe, D.E. (2015). "The relationship between perc time and field-saturated hydraulic conductivity for cylindrical test holes.", National Onsite Wastewater Recycling Association (NOWRA) 2015 Onsite Wastewater Mega-Conference, Virginia Beach, VA, USA, November 3-6, 2015</ref>.
The required calculations have been written into an easy to use spreadsheet, formatted for printing:
The required calculations have been written into an easy to use spreadsheet, formatted for printing:
For reference, the relationship between measured percolation test (PT) and field saturated hydraulic conductivity used in the spreadsheet is:
<math>K_{fs}=\frac{\bar{C_{i}a^{2}}}{PT_{i}\left [ 2\bar{H_{i}^{2}}+\bar{C_{i}}a^{2}+\left ( \frac{2\bar{H_{i}}}{a^*} \right ) \right ]}</math>
<math>K_{fs}=\frac{\bar{C_{i}a^{2}}}{PT_{i}\left [ 2\bar{H_{i}^{2}}+\bar{C_{i}}a^{2}+\left ( \frac{2\bar{H_{i}}}{a^*} \right ) \right ]}</math>