The percolation rate is measured in minutes per inch (mpi). To determine the percolation rate for the area, the rates obtained from each hole are averaged. 0 ÷ 5. This is done to avoid the possible outliers of the high seepage rates when the pit is full with a large head of water, and the low rates when the pit is empty with very little head of water. 2 . Calculate Percolation rate – The percolation rate is the average time in minutes required for water to fall 1 inch. This calculation results in a percolation rate in terms of minutes per inch. The overall infiltration rate is then largely dependent on the level of interconnection achieved through fractures and fissures between the layers with high infiltration rates. That means sandy soils dry out very quickly, heat up very quickly and do not hold nutrients for very long. 1.0 . Divide the number of minutes elapsed by the drop in inches, using the last 30- or 10-minute reading taken for each hole. Silty soils, including loam, have moderate percolation speeds, ranging from 0.1 to 1 inch per hour. Soils with slower percolation rates, through which it takes longer for water to travel, need larger drainfields to handle a given amount of wastewater than those with faster percolation rates. Sewage Flow < 3000 Litres/Day: Sewage Flow ÷ 75 = m . The percolation test calculation is based on the time taken for the water level to fall from 75% to 25% capacity. Professional percolation tests, required for septic leach fields, are expensive, and unnecessary for a small greywater system. Filter Bed Size = 2 m of contact area 0.5 . Record the percolation test data from each hole. Divide this time in seconds by 150. SOIL CONDITION Depth (metres) Soil Type . Determine the percolation rate by refilling each hole with water to a depth of at least 300mm and observe the time in seconds for the water to seep away from 75% full to 25% full (i.e. Soils with very … Sewage Flow ÷ Loading Rate = m . Loading Rate (L/m2/day) 1-20 10 20-35 8 . A home percolation test is a simple way to measure how quickly your soil drains and to determine how much area you need to infiltrate the greywater. This gives the average time in … 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. 1.5. 2 of contact area . 2 ÷ 75 = m . 6. The drop that occurs during the final 10 minutes is used to calculate the percolation rate. 35-50 6 > 50 4 . Percolation Time . a depth of 150mm). Percolation Rate -Based on the final drop, the percolation rate, that is, the time in minutes required for water to fall 25 mm, is calculated. Loading Rate for Fill-Based Absorption Trenches and Filter Beds. Loading Rates . Sandy soils usually have very high percolation rates, measured in the range of 1 to 8 inches or more per hour.

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