subdrain

building subdrain

That portion of a building drainage system which does not drain by gravity into a building sewer; wastes from the subdrain are collected in a sump and discharged by a pump.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
To slow the buildup of contaminated water, TEPCO plans to surround the reactor buildings with a one-and-a-half-kilometer-long frozen wall of soil, which itself will have a barrier of forty-one wells, or "subdrain pits," to siphon off incoming groundwater.
A subdrain is necessary under the pool to remove subsurface water and reduce the chance of such damage.
In general, locate subdrain pipe in side-road ditches or under shoulders to prevent water from reaching the roadway area; lay pipe on both sides of the pavement to control a high water table.
In general, locate subdrain pipe in sideroad ditches or under shoulders to prevent water from reaching the roadway area; lay pipe on both sides of the pavement to control a high water table.