HORIZONTAL HIGHLY-PERMEABLE DRAINAGE FILTER

摘要

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