Lower Meramec Rain Garden and Pervious Pavement

Lower Meramec Rain Garden and Pervious Pavement

Client: EDM, Inc.
Owner: Metropolitan St. Louis Sewer District
Year Completed:​​​​ 2014

M3 Engineering, as a subconsultant to EDM, designed a rain garden and pervious concrete pavement to capture the increased runoff from site improvements at MSD's Lower Meramec Wastewater Treatment Plant.

The rain garden, part of an education/interpretive facility, was sized using MSD Design Guidelines for Water Quality Improvements and included bioretention soil media and a reverse graded aggregate subgrade. Because of the site space limitations, the rain garden was designed as a narrow facility with modular block walls in order to reach the required water quality volume. Plantings included 11 different types of species.

Pervious concrete pavement was used as a patio area and accepted runoff from nearby downspouts. The flow from the downspouts will be absorbed and stored in a clean aggregate subbase. The pavement is 6" thick and was designed according to MSD's Pervious.

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Projects - Site Design