The opening and flow path into and out of the cell must be clear of obstructions. The overflow elevation is the maximum ponding elevation (see page 103) runoff must be directed through an outlet, overflow drain, or bypass and not enter the bioretention area to prevent street or sidewalk flooding. Alternatively, a storm structure, usually a raised drain, may be placed within the cell to direct the overflow downstream when the cell reaches capacity, or a piped connection to the gray stormwater system for overflow volumes. The inflow point may also act as the outflow point for the facility, depending upon the elevations of the street, inlet, and cell. The outflow point serves to direct water back to the street’s gutter or to another cell along the corridor. Inflows should allow the cell to fill up to its full design ponding depth. a depression in the gutter that connects to the concrete channel with a trench grate that then outfalls into the cell.Ī cell along a curbed street may need one or more inflow points, depending upon the length of the cell, in order to maximize the amount of flow entering the cell and use the full capacity of the facility.a catch basin with a pipe or rectangular channel daylighting into the cell or.
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