Hydraulic and earth engineering – Drainage or irrigation – Control means responsive to sensed condition
Patent
1983-07-25
1986-03-18
Corbin, David H.
Hydraulic and earth engineering
Drainage or irrigation
Control means responsive to sensed condition
405 38, 405 50, A01G 2500
Patent
active
045765111
ABSTRACT:
An underground structure formed of rock and cinders permits an artificial water table to be maintained at a selected distance below the ground level. The installation includes a watertight membrane that lines a basin excavated in the earth. A ballast layer of generally uniform size rock is laid on top of the watertight membrane in the basin, and the ballast layer is extremely permeable by water. The ballast layer is covered by a permeable membrane such as cloth. The permeable membrane is, in turn, covered by a layer of finely divided particles such as crushed volcanic ash or cinders. The particles of this fine layer are prevented from penetrating the ballast layer by the permeable membrane. The fine layer permits water to diffuse through it by capillary action. The fine layer is topped by a finish layer which is appropriate to the use to be made of the installation. Water is inserted in the ballast layer causing the water table in it to rise to and above the permeable membrane, the amount of water provided to the finish layer can be adjusted by raising and lowering the water level. A method of levelling the structure is described as well as automatic apparatus for maintaining a particular water level.
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Corbin David H.
McKown Daniel C.
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