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How much water do you need for a percolation test?

Calculate the percolation rate: The hole should be refilled again with 300mm of water and time how long it takes to drain from three-quarters full (225mm) to one-quarter full (75mm). Determine the average time: Divide the above time by 150 (mm) which will produce the average time in seconds for the water to drop 1mm.

What is a normal percolation rate?

For soils to effectively treat effluent, percolation rates must be between 10 and 60 minutes per inch of percolation. You need at least 20 to 21 hours to do a standard percolation test requires.

What is a good percolation test result?

The result of your percolation test determines how large your soakaway should be. The better the results, the smaller the soakaway. A good range is between 15 and 100. However, the closer you are to 100, the bigger the soakaway youll need because drainage is happening slower.

How do you calculate percolation test?

The percolation rate is calculated for each test hole by dividing the time interval used between measurements by the magnitude of the last water level drop. This calculation results in a percolation rate in terms of minutes per inch.

What is the standard percolation test?

Dig the test holes, 300mm square to a depth at least 300mm below the required invert level of the infiltration pipe. Once dug, you should fill them with water. If, after six to twelve hours, the water has not drained away, the percolation test has failed.

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