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underdrain

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underdrain [′ən·dər‚drān]
(civil engineering)
A subsurface drain with holes into which water flows when the water table reaches the drain level.

underdrain
underdrain
A drain, installed in porous fill, for drawing off surface water or water from the soil, as under the slab of a structure.


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Also, although it isn't desirable to infiltrate water near (especially directly uphill of) a foundation, bio-retention may still be utilized if a liner and underdrains are incorporated into the design.
How much you pay depends on the size and depth of the garden, whether you must replace or supplement local soils, whether the site needs an underdrain (a perforated pipe), your choice of plants, and how much you do yourself.
26) The term "construction aggregate materials" is defined as crushed stone, limestone, dolomite, limerock, shell rock, cemented coquina, sand for use as a component of mortars, concrete, bituminous mixtures, or underdrain filters, and other mined resources providing the basic material for concrete, asphalt, and road base.
 
 
 
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