Abstract: A stormwater treatment system, including a treatment container for treating stormwater through a bioretention mechanism. The treatment chamber includes an overflow/bypass system, including a flow distribution tray or flume that includes a distribution compartment or channel, an overflow dam or weir, and an overflow/bypass compartment. The stormwater distribution compartment or channel includes one or more openings for stormwater to be treated to fall onto the filter media located within the treatment container. When high flow rates are obtained that exceed the capacity of the unit, the overflow/bypass stormwater enters the overflow/bypass compartment where it is received by an overflow/bypass outlet pipe to be directed out of the container without such water being treated or further treated by the filter media.

Abstract: A stormwater treatment system including a substantially water impermeable treatment container for treating stormwater through a bioretention mechanism. The treatment container includes an overflow/bypass opening to receive stormwater that bypasses the treatment container filter media, or is only partially treated as a result of high stormwater flows in excess of the capacity of the container to treat the stormwater. The stormwater is directed into the container through an inlet, such as an inlet pipe, preferably connected to a roof drain system for processing and treating stormwater from the roof of a building. The overflow/bypass opening may be adjacent the top wall or bottom wall of the container.

Abstract: A stormwater treatment system including a substantially water impermeable treatment container for treating stormwater through a bioretention mechanism. The treatment container includes an overflow/bypass opening to receive stormwater that bypasses the treatment container filter media, or is only partially treated as a result of high stormwater flows in excess of the capacity of the container to treat the stormwater. The stormwater is directed into the container through an inlet, such as an inlet pipe, preferably connected to a roof drain system for processing and treating stormwater from the roof of a building. The overflow/bypass opening may be adjacent the top wall or bottom wall of the container.