Systems, methods, and devices for removing contaminants from stormwater

A stormwater treatment device, comprising:

• a chamber having a floor and a wall;
• an inlet formed in the wall that receives stormwater into an inlet side of the chamber;
• an outlet formed in the wall that discharges stormwater from an outlet side of the chamber;
• a vertical baffle that divides at least a portion of the chamber into the inlet side and the outlet side, wherein the inlet side and the outlet side are in fluid communication, wherein the vertical baffle is has a height such that stormwater having a flow rate above a certain value flows over the vertical baffle;
• an enhanced settling device positioned in the outlet side of the chamber, wherein a portion of the chamber below a bottom of the enhanced settling device defines a lower portion of the chamber, and a portion of the chamber above a top of the enhanced settling device defines an upper portion of the chamber;
• a flow diverter plate in the lower portion of the chamber;
• and
• an outlet control diverter positioned proximate to the outlet;
• wherein stormwater is received by the inlet in a first flow direction, flows from the inlet side to the lower portion of the chamber in a second flow direction, flows through the enhanced settling device to an upper portion of the chamber in a third flow direction, flows through the outlet control diverter in a fourth flow direction, and is discharged by the outlet in a fifth flow direction.

A method for removing suspended contaminants from stormwater, comprising:

• receiving, at an inlet of a stormwater treatment device having a chamber, stormwater comprising suspended contaminants, wherein the stormwater flows in a first flow direction into an inlet side of the stormwater treatment device and a fluid velocity of the stormwater decreases, wherein stormwater having a flow rate above a certain value flows over a vertical baffle that divides at least a portion of the chamber into the inlet side and the outlet side, wherein the inlet side and the outlet side are in fluid communication;
• receiving, in a lower portion of the stormwater treatment device, the stormwater;
• receiving, in an enhanced settling device, the stormwater from the lower portion, wherein the stormwater flows in a second flow direction that is different from the first flow direction to flow up the enhanced settling device into an upper portion of the chamber on an outlet side of the chamber;
• receiving, at an outlet control diverter, the stormwater from the upper portion, wherein the stormwater flows in a third flow direction that is different from the second flow direction so as to be received by the outlet control diverter;
• and
• discharging, at an outlet, the stormwater.