Changes

===Overflow Configuration===

===Overflow Configuration===

Bioretention can be designed to be inline (accepts all flow from the drainage area and conveys large event flows through an overflow outlet) or offline (allows only the design storm runoff storage volume to enter the facility). Overflow structures must be sized to safely convey large event flows out of the facility. The invert of the overflow should be placed at the maximum water surface elevation of the bioretention cell (typically 150 to 350 mm above mulch surface). In offline bioretention, excess flows are conveyed to a downstream storm sewer or other best management practice by a flow splitting manhole containing a weir and/or overflow outlet pipe, or by by-passing the curb opening and flowing into a downstream catch basin.

Bioretention can be designed to be inline (accepts all flow from the drainage area and conveys large event flows through an overflow outlet) or offline (allows only the design storm runoff storage volume to enter the facility). Overflow structures must be sized to safely convey large event flows out of the facility. In offline bioretention, excess flows are conveyed to a downstream storm sewer or other best management practice by a flow splitting manhole containing a weir and/or overflow outlet pipe, or by by-passing the curb opening and flowing into a downstream catch basin.

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