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Percolation test recording sheet

Percolation test results sheet 2026

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The document outlines the procedures for conducting percolation tests to assess soil suitability for wastewater infiltration systems. It details the steps for excavating test holes, saturating the soil, measuring water seepage rates, and evaluating results based on specific criteria. Additionally, it emphasizes the importance of preliminary ground assessments and considerations regarding groundwater levels and environmental factors.

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Click ‘Get Form’ to open the percolation test results sheet in the editor.
Begin by entering the site location and a description of the ground strata at the top of the form. This information is crucial for understanding the context of your test.
In the trial depth section, record the depth of each hole you excavated. Ensure that these measurements are accurate as they will affect your calculations.
Fill in the time taken for water to seep away from 75% to 25% full level in seconds. This data is essential for calculating the percolation value (Vp).
Calculate Vp using the formula Vp = T/150 and enter it in the designated field. This value helps determine if an infiltration system is feasible.
Finally, sign and date the document at the bottom, confirming that all conditions have been met regarding groundwater levels and nearby water sources.

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Versions	Form popularity	Fillable & printable
2017	4.9 Satisfied (20 Votes)

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How to read percolation test results?

If the Percolation Value (Vp) exceeds 140 seconds, the soil is not suitable for drain fields. If the value is between 100 and 140 seconds (about 7-10 hours to fall 250mm), under drains are desirable. should be given to an alternative system, which may be more economic.