A perc test determines the water absorption rate of the soil (or the percolation rate). This test is essential to understanding whether a septic system can be installed. Step 1, A 2-feet deep hole is dug in the prospective septic … In its broadest terms, percolation … However, they're occasionally also used if there's a problem with an existing drain field and the company … For absorption areas that require a Perc Test, the absorption area is sized by taking into account the site's Perc Rate and the … There are generally acceptable perc rates concerning the construction of a septic system. In short, if land is rural and a municipal sewer system isn’t available, a septic system … To calculate the percolation rate there must be three consecutive percolation tests whose rates are within 10% variance of the other. A percolation test (colloquially called a perc test) is a test to determine the water absorption rate of soil (that is, its capacity for percolation) in preparation for the building of a septic drain field (leach field) or infiltration basin.The results of a percolation test are required to properly design a septic system. Not doing this can result in a failed test in what should be considered as perfectly good soil. These are averaged to determine the “design percolation rate” for the septic system. Most percolation tests are done before the installation of a new septic system. Below are the general guidelines for performing a perc test before placing a septic system. For elevated sand mounds, a Perc Rate between 3-180 minutes per inch is required.
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