Abstract: A method for delaying the maximum rate of discharge of water from a stormwater retention basin includes varying the vertical distance of an intake opening from the waterline inversely with water depth. A flow control device for carrying out the method includes an intake pipe with an intake opening that is pivotally mounted to a float body, the pivot being spaced from the intake opening.

Abstract: A flow control device includes a float that moves vertically in response to changes in water level, a valve body that moves between extended and retracted positions, and a mechanism interconnecting the float and the valve body wherein changes of position of the float in response to changes in water level changes the position of the valve body. The valve body is placed adjacent a discharge pipe to change the effective intake area of the discharge pipe with changes in water level.

Abstract: A flow control device for a storm water management system includes a storage chamber and a number of discharge openings extending through the storage chamber. Associated with each opening is a valving mechanism that opens or closes the opening in response to changes in water level in the storage chamber.

Abstract: A separator for stormwater includes a long, U-shaped sediment chamber and an oil chamber.

Abstract: A stormwater pollutant separator system is provided with the system having a stormwater pollutant separator, a by-pass system, an intake conduit and an outflow conduit connected together. The stormwater pollutant separator includes a chamber with a weir plate and siphon plate therein. The chamber has first, second, and third sections. The first section is located between the chamber first end and the weir plate. The second section is located between the weir plate and siphon plate. The third section is located between the siphon plate and the chamber second end. In one embodiment the third section has filter material placed intermediate the siphon (sometimes referred to as the second weir) plate and the second end plate.

Abstract: A stormwater pollutant separator system is provided with the system having a stormwater pollutant separator, a by-pass system, an intake conduit and an outflow conduit connected together. The stormwater pollutant separator includes a chamber with a weir plate and siphon plate therein. The chamber has first, second, and third sections. The first section is located between the chamber first end and the weir plate. The second section is located between the weir plate and siphon plate. The third section is located between the siphon plate and the chamber second end. In one embodiment the third section has filter material placed intermediate the siphon (sometimes referred to as the second weir) plate and the second end plate.