Stormwater treatment device

A stormwater treatment device, comprising:

• a tank defining an internal volume and having an inlet and an outlet;
• a rotatable screen unit mounted within the tank, the rotatable screen unit defining a through path with an inlet end and an outlet end, the rotatable screen unit includes a screen structure with a plurality of screening openings for allowing passage of at least some stormwater from the through path outwardly through the screen structure while inhibiting passage of at least some trash items through the screen structure such that the trash items move along the through path from the inlet end to the outlet end, wherein the rotatable screen unit includes a plurality of external drive paddles that rotate with the screen structure;
• wherein the stormwater treatment device includes a normal treatment flow path configured to permit at least some stormwater that enters the tank through the inlet of the tank to flow into the inlet end of the rotatable screen unit and through the screening openings to reach the outlet of the tank;
• wherein the stormwater treatment device includes a bypass treatment flow path configured to permit at least some stormwater that enters the tank through the inlet of the tank to bypass the inlet end of the rotatable screen unit and interact with one or more of the external drive paddles to drive rotation of the screen structure before the water moves to the outlet of the tank.