DRAINAGE SYSTEM Russian patent published in 1994 - IPC

Abstract RU 2017887 C1

FIELD: hydraulic engineering. SUBSTANCE: in drainage system the filtering material is arranged in horizontally laid on one another hollow toruses. The latter are located in rows along pond adjacent to one another with filtering spacers laid between them. Used as filtering material is coarse-grained sand. EFFECT: higher efficiency. 2 dwg

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RU 2 017 887 C1

Authors

Kruglov G.G.

Surma N.V.

Dates

1994-08-15—Published

1990-12-17—Filed