Leach Field

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Leach Field

 

(also filtration field), a plot of land on which sewage liquid undergoes natural biological decontamination as it is filtered through soil horizons.

Leach fields are established on sandy, sandy loam, and loamy soils with good filtration properties. They are flat and have an area of 0.5–2 hectares (ha). There are dividing ridges measuring 0.8–1 m high. Sewage liquid from which solid waste, fat, and worm eggs have been removed is fed past gates and through open canals onto the field in a layer of 20–30 cm (in the winter it is frozen to 75 cm). The sewage percolates through the soil and runs through drains to a collector. It then is dumped into a river. After the sewage liquid has been absorbed, the surface of the field is tilled and then flooded again.

Permissible daily norms for loads on leach fields are 70–125 cu m/ha for sand, 50–100 cu m/ha for sandy loam, and 40–70 cu m/ha for loam. Leach fields in which the waste is fed into the soil through drains are set up to decontaminate small amounts of sewage. In contrast to sewage farms, leach fields are not used for crop cultivation.

V. M. NOVIKOV

References in periodicals archive ?
For those of you with a septic tank, this works by allowing the solids and organics to settle to the bottom of the chamber and any treated liquid effluent is commonly disposed of in a septic drain field, which provides further treatment.
Septic drain field diagnosis and repair: Contractor shall: arrange to have existing septic system tank pumped and inspected (first action); excavate to locate and access inspection covers or surface of existing tanks acting as septic drain field and determine cause of effluent breakout at ground surface; if necessary, sewer outlet pipe and distribution box shall be excavated and inspected; determine actions needed to ensure proper function of drain fields; if required, an experienced professional in the field of septic system repair and installation shall be retained to confirm findings and/or execute prescribed scope of work to remedy failure; contractor shall remove from site all contaminated soil that is disturbed during excavation.
ADS) announced it has reached an agreement to exclusively market and distribute the Flowtech septic system, a subsurface septic drain field system, which replaces the need for a barrier cover such as gravel.
the couple's flagship restaurant in Cashmere at 5740 Vale Road is closed temporarily due to septic drain field problems.
Holding tanks are used where the soil is unsuitable for disposing effluent from a septic drain field.
Twenty years is the approximate functional life span of a septic drain field.
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Holding tanks are used on sites where the soil is unsuitable for a septic drain field.
Twenty years is the functional life of a septic drain field.
My hands-on experience with construction of septic systems began while on vacations when I would work with my father-in-law -- who ran an excavation business in Berkshire County -- running his backhoe to excavate for leaching trenches and septic drain fields back in the '80s.
That chloride is derived from septic drain fields implies that nitrate and other constituents of septic leachate are, too.