New York Percolation Test Data (DOH 1327) is a set of data collected by the New York State Department of Health (DOH) to determine the permeability of soils. It is used to measure the ability of water to move through soil and other materials. The data consists of laboratory test results that are used to evaluate the hydraulic conductivity, or percolation rate, of soil samples. There are two types of New York Percolation Test Data (DOH 1327): the single-ring test and the double-ring test. The single-ring test measures the rate of water percolation through a single ring of soil, while the double-ring test measures the rate of water percolation through two rings of soil. The data is used to help determine the suitability of a site for a septic system or other uses. It can also be used to assess the potential risk of water contamination.
New York Percolation Test Data (DOH 1327)
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Test results are usually good for two to five years, and in some cases can be renewed. However, with all things perc, rules vary greatly from town to town so don't make any assumptions. Always check with the town health department before proceeding.
On rural sites without municipal sewage systems, a failed perc test means that no house can be built ? which is why you should make any offer to purchase land contingent on the site passing the soil and perc tests.
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.
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.
The time of year can definitely affect perc test results as well as the level of the water table, which is also a concern. In general, the driest season will yield the best results since dry soil readily absorbs water and the water table is lowest. Soil saturated with water from rain or melted snow will not perc well.
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.
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 you'll need because drainage is happening slower.