Provided is a separator comprising a chamber having a chamber wall opening, and an inlet module comprising an attachment portion and a projecting portion, the attachment portion is coupled to the chamber wall and comprises an inlet for receiving liquid, the projecting portion comprises an outlet configured to create a circulating flow about a central axis of the chamber, the projecting portion is offset from the attachment portion, a first wall is formed between the projecting portion and the chamber wall, a second wall opposes the first wall, a first side wall and a second side wall oppose each other and connects the first and second walls, the second side wall is continuous and the first side wall defines the outlet, the outlet is directed tangentially with respect to the central axis and wherein liquid exits the inlet module in a tangential direction with respect to the central axis.

A control plate is provided at a preferred position in a storm overflow chamber. An inflow pipe, an intercepting pipe, and an outflow pipe are connected to the storm overflow chamber. A vortex flow type water surface control device for a draining device includes the overflow chamber, and a control plate arranged in front of an opening portion of the intercepting pipe opening to the storm overflow chamber. A relation (1) 0.5 D≦X≦0.7 D and 0.83 D≦Y≦1.5 D holds true, or a relation (2) 0.4 D≦X≦0.5 D and 1.0 D≦Y≦1.5 D holds true, where D represents an inner diameter of the opening portion, X represents a projection length of the control plate with respect to the opening portion, and Y represents a distance between the control plate and the opening portion. As a result, contaminants enter the intercepting pipe.

A continuous belt screen assembly and related methods of controlling flow through the continuous belt screen assembly. The continuous belt screen assembly has a base, opposed sides, an inlet and at least one outlet. The assembly, in use, is arranged in a channel having a pair of opposed walls and containing a liquid. A flow restrictor for the continuous belt screen assembly includes a body mountable to a downstream end of the assembly to restrict the liquid flowing out of the at least one outlet. The body defines at least a portion of at least one aperture configured to control a level of the liquid upstream of the body.

The invention provides a modular rain garden system comprising a plurality of preformed channel sections 310 and two end panels 320. The channel section 310 and end panels 320 are configured to form a trough 300 when assembled to receive rainwater runoff. At least one end of the channel section has an engaging profile configured to engage with another channel section or one of the end panels. Divider panels 330 are provided to separate the trough into compartments, to provide additional strength or rigidity to the trough or to control or limit the flow of water between compartments. The side walls 312 of the channel sections, the end panel 320 and the divider panels 330 are corrugated by means of projections or grooves 313, 321 and 331 respectively to increase the strength and load-bearing capability of the components.

The invention pertains to a float switch apparatus for use in activating one or a series of pumps. The float switch apparatus has particular use in combination with sump pump vessels. The apparatus includes an electrical chamber which is sealed from the vessel atmosphere and contains at least one switch controlling the activation of at least one pump, configured to pump liquid from the vessel. Within the electrical chamber there is a magnetic activation device which slides vertically along one wall of the chamber. On the opposing side of the chamber there is a magnetic coupling head which couples to the activation device magnetically through the coupling wall. The coupling head is mounted on top of a float rod having a float mechanism at the bottom thereof. The entire float switch apparatus is mounted in the vessel such that when the water reaches a predetermined level the float moves the float rod vertically and thus the coupling head is moved vertically. Since the coupling head is coupled to the magnetic activation device in the sealed electrical chamber, the activation device is also moved vertically and activates at least one switch for controlling the activation of a pump. The liquid in the vessel in then pumped out and the float rod moves down vertically in response. At a predetermined point the magnetic activation device no longer activates the switch controlling the pump and the pump is turned off. This device allows the electrical components of the float switch apparatus to remain sealed from the vessel atmosphere.

An example system includes a valve between a suction pipe extending into a sewage pit and a vacuum pipe connected to a sewer system. The vacuum pipe has vacuum pressure. The valve is controllable to open to allow content to flow from the sewage pit, through the suction pipe, and into the vacuum pipe. A sensor is configured to detect the vacuum pressure in the vacuum pipe. The valve is controllable to open for a duration that is based, at least in part, on the vacuum pressure in the vacuum pipe.

An example apparatus is for use in a system that includes a sewage pit, a suction pipe in the sewage pit, and a valve between the suction pipe and a vacuum pipe that connects to a sewer system. The apparatus includes a controller configured to perform operations that include: detecting a vacuum pressure in the vacuum pipe, determining that the vacuum pressure in the vacuum pipe is below a predefined pressure, and preventing the valve from opening in response to determining that the vacuum pressure in the vacuum pipe is below the predefined pressure.

A stackable baffle drop shaft unit and method provides a pre-cast body that has a peripheral wall extending thereabout and having a top edge and an opposing bottom edge, the peripheral wall has an exterior facing surface and an opposing interior facing surface, and the body defines a medial channel extending therethrough between the top edge and the bottom edge. A baffle is carried by, and extends inwardly from the interior facing surface and partially across the medial channel defined by the body, and the baffle is positioned between the top edge and the bottom edge. The top edge and the bottom edge of the pre-cast body each define a portion of a positionally securing engagement and alignment means for positional and vertical alignment and stacking of plural units on top of one another. Vertical stacking of plural bodies forms a medial channel extending therethrough.

The present invention relates to a water resource utilization structure that collects and stores water resources penetrating the ground, such as rainwater or melted snow, and distributes and utilizes the stored water resources for various purposes such as housing, vegetation, trees, industry, and fire. 1. It is a structure that utilizes water resources to respond to global environmental disasters and climate change with a focus on water circulation, water storage, and water supply. 2. In other words, it is a water resource utilization structure for sustainable green growth in response to global climate change.

Sewage flowing into a second water branching device is accurately controlled to separate into the following: sewage with a maximum sewage volume that can be discharged into a public water body W, the sewage sequentially passing through a first regulating tank, a first orifice, a second regulating tank, a second orifice, a third regulating tank and a third orifice to flow into a second discharge pipe; and sewage with an excess sewage volume, the sewage overflowing first to third overflow weirs to flow into an inflow pipe for a regulating reservoir.