A gravitational separator for a drainage system includes a collection cavity within which drainwater is collected. The collection cavity includes an exit; and a baffle is strategically arranged within the collection cavity for isolating a boundary region of the cavity interior from the central region thereof and for directing the flow of drainwater which moves through the boundary region along a desired flow path. In addition, an outlet control structure is disposed over the mouth of the exit and includes a sidewall having an opening through which drainwater which enters the mouth of the exit must enter so that as the drainwater enters the sidewall opening and moves into the mouth of the exit opening, the direction of flow of the drainwater is altered through at least 90 degrees.

A separator unit includes a tank defining an internal volume and having an inlet and an outlet. An insert is provided within the tank, the insert including a down cylinder substantially centrally disposed within the tank and a baffle assembly at an external side of the down cylinder. The baffle assembly defines first and second inlet flumes for flowing incoming water from an external side of the down cylinder to an internal volume within the down cylinder. Inward ends of the first and second inlet flumes are positioned and oriented to create first and second vortex flows that progress downward within the internal volume, wherein a rotational direction of the first vortex flow is opposite a rotational direction of the second vortex flow in top plan view.

Vertically oriented cylindrical vaults, boxes, systems, and methods of treatment systems to capture pollutants from storm water runoff and prevent the conveyance of these pollutants from entering a receiving water body or landscape area, which is designed to be a part of a local permanent storm water drainage infrastructure. A flow deflector can include a flow spreader for splitting an incoming flow into two flow paths that interact with high profile vertical baffle(s), and with low profile vertical baffles, and angled low profile vertical baffles that extend above downwardly inclined surfaces of a horizontal deflector having an opening for allowing debris to fall. Treated water can pass out of an outflow pipe on an opposite side of the cylindrical vault. A bottom open skimmer or a flow restrictive skimmer or a hydro-variant skimmer can be used in front of the output flow port. A hydro slide system can be used to push debris toward the middle of a sloped floor for easier removal through access points in the vault lid. The input flow port can be spaced approximately 90 degrees from the output port. And the input port and the output port can be on the same sides of the cylindrical vault.

The present invention provides a storm water pretreatment chamber. The storm water pretreatment chamber includes: a base, an inlet sidewall, a first sidewall, a second sidewall, a filter sidewall, a handle, a first locking mechanism, a second locking mechanism, a first lifting cable, and a second lifting cable. Methods of treating storm water are also provided.

A method, system, and apparatus directed to an innovative approach for the treatment of stormwater utilizing hydrodynamic separator assembly designed to maximize flow movement for more efficient sediment removal and maximize water flow control.

A solution contains at least one sulfone polymer and N-tert.-butyl-2-pyrrolidone. The solution can be used in a process of making a membrane, which is useful for water treatment.

A method of removing sediment from fluid flow within a storm water drain pit by deflecting flow entering the pit towards the side walls of the pit by one or more deflectors. This reduces the energy of the fluid flow and promotes settling of sediment within the catch pit. Each deflector is preferably of a concave form and may be located in a storm water drain pit bag or suspended. A removable catch basin receptacle for a storm water drain pit includes a container has a low flow outlet defining a fluid path for fluid at a first level within the container to a second level, higher than the first level, outside the container. An overflow path provides a fluid flow path out of the container at a level higher than the first or second level.

A reservoir withdrawal system is disclosed comprising a selectively-adjustable water intake positioned within a reservoir. The water intake is adapted to withdraw water from the reservoir at a desired depth using a telescoping conduit. A water transport system is in fluid communication with the water intake and with a water discharge. A controller allows an operator to selectively adjust the desired depth of the water intake.

A gravitational separator for a drainage system includes a collection cavity within which drainwater is collected. The collection cavity includes an exit; and a baffle is strategically arranged within the collection cavity for isolating a boundary region of the cavity interior from the central region thereof and for directing the flow of drainwater which moves through the boundary region along a desired flow path. In addition, an outlet control structure is disposed over the mouth of the exit and includes a sidewall having an opening through which drainwater which enters the mouth of the exit must enter so that as the drainwater enters the sidewall opening and moves into the mouth of the exit opening, the direction of flow of the drainwater is altered through at least 90 degrees.

A sedimentation device for material which is contained in fluid, in particular rainwater, includes a sedimentation insert (12) which in the position of use is inserted into a shaft element (12), wherein the sedimentation insert (12) includes a run-in chamber, said run-in chamber being delimited by a run-in chamber side wall (20) which provided with a lateral run-in opening (19) and on its lower side having an outlet opening (23), wherein a flow-breaking device (24) for breaking the flow of a fluid flow which is produced in a throughflow direction (26) between the run-in opening (19) and a run-out opening (25) is assigned to the outlet opening (23), and wherein the sedimentation insert includes a run-out chamber (32) which annularly surrounds the run-in chamber (18) and which is delimited by an inner run-out chamber side wall, a base (33) and an outer run-out chamber side wall (34), wherein the run-out opening (25) is formed on the delimitation of the run-out chamber (32) and wherein the outer run-out chamber side wall (34) is designed as a spillway (38).