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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]
A fire hose is used to fill the pit as quickly as possible, and then, again, its dissipation rate is observed. This rate calculates the size and number of pits necessary for a viable septic system. Finally, a "deep hole" is drilled to find the water table or to approximately twelve feet (dry) for leach line systems and horizontal seepage pits.
However, soils do not absorb the excess NO 3 – ions, which then move downward freely with drainage water, and are leached into groundwater, streams and oceans. [2] The degree of leaching is affected by: soil type and structure. For example, sandy soil holds little water while clay soils have high water-retention rates;
Liquids leach from the pit and pass the unsaturated soil zone (which is not completely filled with water). Subsequently, these liquids from the pit enter the groundwater where they may lead to groundwater pollution. This is a problem if a nearby water well is used to supply groundwater for drinking water purposes.
A French drain can resemble a horizontal dry well that is not covered. A larger open pit or artificial swale that receives stormwater and dissipates it into the ground is called an infiltration basin or recharge basin. In places where the amount of water to be dispersed is not as large, a rain garden can be used instead.
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Liquids leach from the pit and pass the unsaturated soil zone (which is not completely filled with water). Subsequently, these liquids from the pit enter the groundwater where they may lead to groundwater pollution. This is a problem if a nearby water well is used to supply groundwater for drinking water purposes.
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