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What is a failed perc test?

If the water drains faster than 1 minute per inch of drop, this is considered a failed perc test because it indicates that the wastewater will drain through the soil and into the groundwater before it can be filtered.

What is a normal percolation rate?

The average monthly percolation rates of sand clay loam, sand clay, and clay vary 2-4.5 mm/day, 1.5-3.5 mm/day, and 0.5-2 mm/day, respectively with the rainfall intensity of 4-14 mm/day.

What is the best percolation rate for soil?

Sandy soil has large particles and large air gaps too. Water flows through sandy soil fastest and hence percolation rate of sandy soil is the highest.

What is a good percolation rate for soil?

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.

How do you read a percolation test?

The percolation rate is the average time in minutes required for water to fall 1 inch. Record the percolation test data from each hole. Divide the number of minutes elapsed by the drop in inches, using the last 30- or 10-minute reading taken for each hole.

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