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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. [1] The results of a percolation test are required to design a septic system properly.
A septic drain field, a septic tank, and associated piping compose a septic system. The drain field typically consists of an arrangement of trenches containing perforated pipes and porous material (often gravel) covered by a layer of soil to prevent animals (and surface runoff) from reaching the wastewater distributed within those trenches. [1]
While an effluent sewer can use gravity to move waste, the ability to move waste with a pressure system can be a big advantage in places where a gravity system is impractical. Compared to conventional sewer systems, effluent sewer systems can be installed at a shallow depth and do not require a minimum wastewater flow or slope to function. [1]
When underground sewer lines are laid close to the ground level (this may be at the depths of less than 0.75 metres (2.5 ft) or 2 metres (6.6 ft) depending on local regulations), an inspection chamber is used as an access point instead. [6] [7] Inspection chambers allow access to sewer lines without requiring a person to get in them. [6]
A septic tank is an underground chamber made of concrete, fiberglass, or plastic through which domestic wastewater flows for basic sewage treatment. [2] ...
The mound system was designed in the 1930s by the North Dakota College of Agriculture. [1] and was known as the Nodak Disposal System.In 1976, the University of Wisconsin studied the design of mound systems as part of the university's Waste Management Project.
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