Civil · C-3RZPV

Bio-Retention Basin Detail

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This bio-retention basin assembly consists of a twenty-four-inch layer of bio-retention media containing sixty to seventy percent sand, fifteen to twenty-five percent compost, and ten to twenty percent topsoil with eight to twelve percent organic content and a pH of 5.5 to 7.5. Below the soil media, a twelve-inch layer of washed open-graded crushed Class 2 base supports the underdrain system. The drainage network incorporates a four-inch perforated Class 100 PVC pipe featuring two rows of 0.375-inch to 0.625-inch diameter openings at one square inch per linear foot, connected via a four-inch tee, six-by-four-inch reducer, and six-by-six-by-eight-inch tee to sized piping per plan. An atrium grate tops an eight-inch overflow riser positioned six inches above the splash block and finished ground surface.

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