FIELD: hydraulic, waterwork and reclamation building to form horizontal drainage and radial underground water intake systems.
SUBSTANCE: filter is composed of a number of rings. The rings include trapezoid members put on rods so that gaps and vertical slots are created. The gaps expand in filter interior and equal to average gravel-sand filler particle dimensions. Vertical slots are adapted for water ingress. The rings are pulled together and define units connected with each other.
EFFECT: increased filter permeability.
5 dwg
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