Abstract: A system for removing sediment from water is disclosed. The exemplary embodiments described herein disclose a system comprising a filter chamber, having a deck positioned inside to divide it into an upper chamber and a lower chamber. The deck may have a plurality of holes to hold filtration elements and also may have a ridge or a skirt or both. The filtration elements may be filter cartridges with multiple elongated filter elements that extend down into the lower chamber.

Abstract: The invention relates to a drainage trench unit (10) which comprises at least one drainage trench sub-unit (12), the at least one drainage trench sub-unit (12) having a base wall (16) and a plurality of hollow pillars (18), said pillars (18) being connected integrally to the base wall (16) and tapering, preferably conically, away from the base wall (16), i.e. tapering from their base end (18a) to their top end (18b). The invention also relates to a transport unit for transporting a plurality of such drainage trench units (10).

Abstract: A filter for a storm water inlet having a surface opening for receiving storm water runoff comprising liquids and solids and discharging said runoff into an interior compartment below having a substantially vertical interior wall or walls defining a cross-sectional area. The filter comprises one or more precast pervious concrete filter elements, the element or elements being formed such that the filter substantially fills the entire cross-sectional area of the interior compartment. Also, a storm water inlet including such a filter, and a method of adding such a filter to a storm water inlet.

Abstract: A water distribution system for the distribution of water may include a collection and filtering device to collect and filter water for the water distribution system, a Hydro turbine generator to generate power from the collected water and a storage tank to store water from the Hydro generator.

Abstract: A filtration apparatus for curb vaults may be installed in existing vaults through the road-level inlet opening into the vault. A support plate assembly of the filtration apparatus suspends a primary and secondary filter and is movable between extended and retracted positions. An adjustable attachment system allows installation of the filtration apparatus by inserting the apparatus through the inlet opening.

Abstract: A fluid drainage system configured for draining a basin impounding fluid and sediment, solids or the like of varying density and turbidity. The system includes a first conduit and a second conduit within or adjacent to the first conduit to form a fluid receiving chamber between the first and second conduits, each conduit having apertures therethrough, with the apertures of the first and second conduits being sized and arranged relative to one another and so configured as to preferentially discharge fluid from the top of a basin, thus providing flow conditions which inhibit the entry of sediment into the system so as to maximize the retention of sediment within the basin and reduce turbidity and Total Suspended Sediment in the discharged fluid.

Abstract: A pervious concrete slab is pre-cast in a reusable mold or form to define at least one keyway configured and arranged to engage with a complementary keyway of another similar pre-cast pervious concrete slab. The concrete slab is then cured in a controlled environment, transported to an installation site, and installed.

Abstract: A horizontal flow water treatment method and wetland biofilter apparatus provides a chamber with impermeable outer walls spaced away from permeable interior walls of a media filtration bed such that a catch basin is formed between the outer walls and the interior walls. The catch basin creates an open area around the perimeter of the interior walls for influent water to fill within the open area on all sides before penetrating the filtration media, providing a large surface area for influent water to interact with the media filtration bed. The influent water enters the catch basin in a horizontal flow path to provide for pre-settling of particulates before making contact with the filtration media. The biofilter design increases the available surface area of the media filtration bed by up to four times for a given volume of water, and thereby minimizes the loading or infiltration rate on the media filtration bed.

Abstract: A trap for a catch basin, and means for mounting said trap to a catch basin wall, comprises a hollow trap body having an inner wall and an outer wall, and side walls joining the inner and outer walls. The trap body has a first aperture near the top of its inner wall, allignable with an outlet of a catch basin, and a second aperture at a lower level on said trap body than said first aperture. A mounting plate is secured to the inner wall of the trap body, and has an aperture allignable with the first aperture of the trap body. A retainer plate is provided, onto which the mounting plate can be mounted. The retainer plate also has an aperture allignable with the apertures on the mounting plate and trap body.

Abstract: A runoff water vault may be divided into an input chamber which receives runoff water and a second chamber which also separates and stores buoyant and non-buoyant materials separated from the runoff water stream. While the separators in such systems remove particles of different densities than water quite well, they have difficulty in removing neutrally buoyant debris. Screens are added into the water flow stream to catch and remove particles of neutral buoyancy. The screens are mounted in a manner which permits lateral movement of the screen relative to the water flow, such as shaking and/or flexing. Screen movement imparts pressure differential across the screen perforations releasing debris trapped against the screen, so that the debris will fall into an entrainment area and allow increased flow through the screen. The screens may also include one or more turbulator fins for intersecting the water flow and transferring energy to the screen, imparting lateral movement to the screen.

Abstract: Apparatus for treating run-off water, the apparatus including a mechanical-sorption filter for removing particulate and colloidal material; an ion exchange filter for removing positively charged ions; and, a sorption filter for removing at least other soluble contaminants.

Abstract: An improved system designed to control and filter runoff water in storm drains is presented. Drain water frequently carries trash, organic matter, suspended solids, hydrocarbons, metals, nutrients and bacteria collected from streets and parking lots into a storm drain inlet, which enters storm water drain pipe systems. The present invention supplies a series of baffle boxes inserted in the drain water stream with a final box possessing a selection from a collection of upflow filters, including a hydrocarbon-absorbing boom. The system can also support a storm flow bypass that directs high-flow storm runoff water directly to the outlet to protect the filter system.

Abstract: A water treatment system is provided by the present disclosure that includes at least one porous pavement portion having an aggregate material containing post-consumer recycled glass or rubber and a binder. The system includes a water quality unit in fluid communication with the porous pavement portion and the porous pavement portion directs a flow of fluid to the water quality unit. The water quality unit filters pollutants contained in the fluid.

Abstract: A storm water nutrient separating vault has a floatable filter basket therein for collecting debris entering the storm water filter vault which basket rises and falls with the water level in the vault. The floatable filter basket has a pair of swiveling trucks attached thereto. Each truck is supported on a generally vertical track mounted to a wall of the vault on one side of the vault's inlet and has a plurality of rollers riding in the track. The floatable filter basket can therefore swivel or tilt while rising or falling with the water level in the vault to maintain an opening in the nutrient collecting basket in front of the vault's inlet for capturing floating debris in the storm water entering the vault.

Abstract: A liquid separation system and related method for retaining floating and non-floating particulates within a storage chamber of a treatment tank. The tank may or may not include a bypass to allow a portion of liquid coming into the tank to bypass the storage chamber. The storage chamber includes an inlet and an outlet. The outlet may be positioned within the storage chamber to cause minimal disruption of the primary and secondary liquid flow patterns within the storage chamber. A circular or rotational flow pattern may be created within the storage chamber and an outlet port of the storage chamber may be centered on an axis of the circular flow pattern.

Abstract: A reinforced silt retention material with a variable sieve capability is provided for use in soil erosion control applications. The reinforced silt retention material includes a sheet of water permeable filtering material having varying apparent opening sizes at a series of filtering zones defined along the sheet, which allows varying amounts of runoff water to pass through the sheet but resists the passage of silt and debris therethrough. The silt retention material further includes one or more reinforcing elements that provide additional support to the sheet to protect against tearing and/or undue movement of the sheet, as well as provide attachment points for fasteners used to fasten the sheet to support members for proper positioning during erosion control applications.

Abstract: Device (V) for catching rainwater from a downpipe (F) comprising an opening (11), a branch pipe (5) with a sickle-shaped water-catching blade (12) comprising two halves at the end, a support member (1) traversed by the branch pipe (5) and a retainer. The branch pipe (5) engaging into the opening (11) with the water-catching blade (12) placed in the downpipe, and wherein the downpipe (F) can be fixed in the area of the support member (1) covering the opening (11) by means of the retainer (H). The retainer (H) comprises at least one undercut engagement hook (17) that can be passed through the opening (11), and an engagement hook tensioning system (S) interconnected between the support member (1) and the engagement hook (17).

Abstract: A system for purifying rainfall runoff including a bar screen; a collection and diversion device; a filter channel; a grass ditch; and a water storage tank. The bar screen is disposed around the collection and diversion device for preliminarily filtering the road rainfall runoff. The collection and diversion device collects the road rainfall runoff and diverts early rainfall runoff to the filter channel, after the filter channel is full, later rainfall runoff is directly diverted to the grass ditch through open channels. The grass ditch includes a percolation bed capable of filtering the early and later rainfall runoff. The water storage tank is connected to the grass ditch via a guiding pipe, to receive the rainfall runoff effusing out of the grass ditch. Part of the rainfall runoff received by the water storage is transported to the percolation bed by a return conduit.

Abstract: A system for harvesting rainwater for use in a skirt building. The skirt building includes a main building and a podium supporting the main building. The system includes: a standpipe; a buffer channel; a filter channel; and a green roof. The green roof includes a vegetation region including a baffled diversion corridor, and a bottom filtering layer including a drainage pipe. The standpipe is arranged on the main building and is connected to the buffer channel where the energy of rainwater flowing out of the standpipe is dissipated. The buffer channel, the filter channel, and the green roof are arranged on the podium, and the buffer channel communicates with the filter channel. The filter channel is connected to the green roof. The filter channel is divided into a plurality of sections respectively filled with different matrix materials.

Abstract: A scalable, modular water filtration and re-capture system is disclosed, such as for use as a high performance bioswale, or other purposes. The system includes a filter container with a removable cartridge that contains a filter media soil and planted vegetation, which may be for example one or more hyperaccumulators. The filter container is stacked together with a cistern container and in fluid communication therebetween to form a stacked container pair as a water filter and capture module. This allows for efficient servicing and removability of the filter cartridge, such as in bioswale, below ground, or above ground configurations. Water inflows and outflows may be circulated for varieties of reclamation uses, or treated water may simply be stored or conveyed into the ground. Multiple such modules may be secured together in custom scalable configurations to meet various needs and intended uses for water volumes, available space or terrain, or specific water treatment needs.

Abstract: A grate filtration system filters trash and debris from water flowing through a water channel by way of two vertical grates that intersect at a vertex and form a wedge shape that protrudes into the direction of flow of water in the channel. The grates are removably supported in grooves on side and center pillar supports. The vertical grates provide a spillway near the vertex. The system further includes a concrete apron that provides a smooth surface for the system and has grooves to support and retain the bottom edges of the vertical grates.

Abstract: An integrated system for treating and recycling rainwater in a residential community. The residential community includes low-lying land. The integrated system includes a primary channel for receiving and treating initial rainwater, a baffled water treatment pool, and a reservoir. The primary channel includes an external wall and an inner wall. The baffled water treatment pool includes a water inlet which is disposed on the inner wall of the primary channel. The reservoir includes a water inlet, a gravel filter layer, and an overflow wall. The primary channel, the baffled water treatment pool, and the reservoir are disposed in the low-lying land. The primary channel is annular and surrounds the baffled water treatment pool and the reservoir. The overflow wall of the reservoir cuts off the annular primary channel. The baffled water treatment pool and the reservoir are adjacent to each other and are divided by a shared wall.

Abstract: Included in this disclosure is a downspout drain filter for rain gutter downspouts. The downspout drain filer comprises elongated housing having an axis, a top portion, and a bottom portion. A transition portion connects the top portion to the bottom portion. The top portion includes an intake opening, a top portion perimeter, a debris opening, a filter attachment location, and a downspout attachment location. The downspout attachment location includes a flexible collar that defines a downspout attachment location perimeter that is less than the top portion perimeter. The bottom portion includes a flexible collapsible body that extends from the transition portion. A connection end is positioned opposite the transition portion as a part of the bottom portion. A filter is positioned in the top portion to direct debris out the debris opening and to permit liquid to pass to the bottom portion.

Abstract: Some examples includes a flow-through stormwater sump having a bottom and defining an inlet opening, an outlet opening and a top access opening, an inlet conduit coupled to the flow-through stormwater sump at the inlet opening, an outlet conduit coupled to the flow-through stormwater sump at the outlet opening and a flow-path baffle disposed in the stormwater sump, the flow-path baffle being substantially planar and defining a plurality of openings, the flow-path baffle oriented such that a centerline of the inlet conduit intersects a major plane of the baffle at a point and a centerline of the outlet conduit intersects the major plane at a further point, the flow-path baffle disposed in the stormwater sump in a direct impingement inlet flow-path of the inlet conduit and a direct impingement outlet back-flow-path of the outlet conduit.

Abstract: A stormwater treatment system includes water treatment media that defines a helical flow path within a conduit. The water treatment media may include a plurality of helical water treatment media components that are constructed and arranged to seal against an inside surface of the conduit. The individual helical water treatment media components may be installed in situ within the conduit when the conduit is positioned within a chamber having an access opening, and periodically removed and replaced by passing the components to the access opening. The components further may have a flexible frame, which allows the water treatment media to dynamically adjust to swelling of the filtration media and other forces that may occur during use. The performance of the system may be adjusted by adjusting the helical pitch of the helical water treatment media components.

Abstract: Retractable screen systems and methods for catch basins are disclosed. In an example embodiment, a retractable screen apparatus includes a retractable center screen coupled to a retracting spring-loaded tube assembly secured to a portion of the catch basin. Two independently-operating side screens may each be coupled to the retractable center screen. Each side screen may be spring loaded such that each side screen is capable of opening and closing horizontally based on a predetermined fluid flow rate of water flowing into the catch basin.

Abstract: A system for treating water for subsequent consumption by animals. Illustratively, the system includes a wastewater treatment facility configured to treat wastewater effluent from an egg washer for subsequent consumption by egg producing birds. Further illustratively, stormwater run off collected from the facility is treated for subsequent consumption by the birds.

Abstract: The bioretention box includes a vault, a lid and a removable grate positioned within the lid, the combination of the vault, lid and grate being positionable with a dugout subgrade region and capable of supporting vehicular traffic within a parking area. Within the bioretention box is a treatment region to remove contaminants from storm water ingress. The treated water moves through openings in the bottom of the vault or through pipes to outside the vault, to a storm drain. The bioretention box includes overflow pipes which accommodate heavy storm water flows.

Abstract: A filter system for a storm water sewer includes a flat mount frame with inwardly projecting support wires and seats on an internal ledge of a grate frame supporting a removable grate. A fabricated circular wire basket has welded cross wires defining openings in side and bottom walls and is lined with a porous filter fabric for collecting silt within storm water flowing through openings in the grate. The wire basket has upwardly projecting bent wire portions hooked onto the support wires of the mount frame and define overflow passages and handle openings for removing the mount frame and the basket after the grate is removed. A smaller and lined lift-out wire basket is supported within a lower portion of the wire basket attached to the mount frame, and each wire basket may be compressed laterally into an oval configuration for use with a rectangular mount frame.

Abstract: An effluent treatment process and plant. The treatment includes at least one passage of the effluents through a device for biological pretreatment of the effluents, such as a bacterial bed, a lagoon or lagooning or a biological disc, at least one nitrification-denitrification of the pretreated effluents resulting from the biological pretreatment device, using a vertical-flow filter planted with rhizome plants, for example reeds, of which a lower zone is flooded and an upper zone is unflooded, and a device for injecting coagulants capable of precipitating the phosphates of effluents, for example ferric chloride salts.

Abstract: A method of flow baffle installation is disclosed herein. The method, in various aspects includes the steps of orienting a side support at a specified elevation about a sidewall of a sump using a leveling support, bolting the side support to the sidewall of the sump following the step of orienting a side support at a specified elevation about a sidewall of a sump using a leveling support, orienting an opposing side support at the specified elevation about the sidewall of the sump using a corresponding leveling support, bolting the opposing side support to the sidewall of the sump following the step of orienting an opposing side support at the specified elevation about the sidewall of the sump using a corresponding leveling support, adjusting an adjustable cross-member to span between the side support and the opposing side support. This Abstract is presented to meet requirements of 37 C.F.R. §1.72(b) only.

Abstract: A gate valve curb box strainer collects debris introduced through a street level cover, minimizing debris build up in the gate valve access pipe of the curb box. Water passes through the curb box strainer, while the strainer catches debris that naturally builds up over time via the street level cover. When a worker removes the cover to exercise the valve, he need only lift the gate strainer out of the access pipe and shake the debris out of it. There is no need to take extra time digging out or vacuuming out the debris. In an emergency situation such as accessing the valve for a fire hydrant or during a water/sewer main break, this could save valuable time. After the valve has been exercised, the empty gate valve curb box strainer is dropped back in place prior to covering the gate valve curb box with the street level cover.

Abstract: A self-evacuating vertical downspout adapter includes an elongated adapter body defining open top and bottom ends, and an enlarged-volume debris trap with a debris outlet between the top and bottom ends. A drainage grate is located inside the adapter body and defines a drain-through floor of the debris trap angled downwardly towards the debris outlet. A hinged outlet door is attached to the adapter body adjacent the debris outlet, and is urged in a normally closed position to prevent substantial escape of rainwater through the debris outlet. The outlet door is adapted for being pivoted on-demand to a temporarily open position by debris captured on the drainage grate and gravity-fed towards the debris outlet for automatic evacuation.

Abstract: An apparatus and method for use in conjunction with box culverts to collect and filter or otherwise treat dirty or polluted storm water runoff or other fluid is disclosed. One or more filter devices with filter media is used in connection with a box culvert. One or more internal bypass assemblies is disposed along a vertical surface in the box culvert. One or more concrete slabs is installed within the box culvert and forms a false floor below the filter devices. The false floor provides an annular space through which fluid can bypass the filter devices and be released to a drainage system.

Abstract: A gutter cover for a roof gutter, fashioned to extend longitudinally in overlying relation to a length of the gutter. The gutter cover comprises: (i) a top portion extending forwardly from a rear edge of the gutter cover; (ii) a front wall extending downwardly from the top portion; (iii) a ledge extending generally horizontally in front of the front wall; (iv) a first longitudinally extending ridge formed in the top portion, (v) a first bank of apertures behind the first longitudinally extending ridge, and (vi) a second bank of apertures in front of the first longitudinally extending ridge; wherein the average size of the apertures in the first bank is larger than the average size of the apertures in the second bank.

Abstract: Certain embodiments of the invention provide systems that filter surface water runoff that enters sewer or storm drains. Some embodiments of such systems are composed of a top plate, a main filter chamber, and an enhanced media filter, and each of the top plate, the main chamber, and the enhanced media filter are shaped for mounting into a storm drain. In some embodiments, the top plate is shaped to overlap a perimeter of the sewer or storm drain hole and has a surface water intake opening. In some embodiments, the top plate, the main filter chamber, and the enhanced media filter are vertically arrayed, respectively, from top to bottom.

Abstract: A filtering device and method is provided for filtering debris from liquid flowing over a surface. The device includes a flexible, liquid-permeable elongated body possessing a plurality of faces including a planar bottom face configured to rest on the surface. The liquid-permeable elongated body is formed of a plurality of compressed fibers and an adhesive bonding together the fibers. The device may be arranged on the ground on a construction site to inhibit loose debris from being washed away by rainwater into storm drains and nearby bodies of liquid.

Abstract: A stormwater gully comprises a chamber in which an outlet assembly is installed. The outlet assembly comprises filter units connected to an outlet housing. In use, stormwater can flow from the chamber in an upwards direction through filter units into the outlet housing. The outlet housing has an outlet, which extends from the gully. At high rates of flow, the water level in the chamber will rise until water can flow into the outlet housing through bypass inlets. The bypass inlets are connected to the interior of the housing by siphons defined by arched regions of a top cover. The siphons allow rapid discharge of water until the water level returns below the level of the bypass inlets. A slow drain down feature is provided which enables the chamber and outlet assembly to be drained below the level of the primary inlet.

Abstract: A stormwater treatment system includes water treatment media that defines a helical flow path within a conduit. The water treatment media may include a plurality of helical water treatment media components that are constructed and arranged to seal against an inside surface of the conduit. The individual helical water treatment media components may be installed in situ within the conduit when the conduit is positioned within a chamber having an access opening, and periodically removed and replaced by passing the components to the access opening. The components further may have a flexible frame, which allows the water treatment media to dynamically adjust to swelling of the filtration media and other forces that may occur during use. The performance of the system may be adjusted by adjusting the helical pitch of the helical water treatment media components.

Abstract: Systems and methods are involved with but are not limited to: a freestandable container including one or more wall portions extending at least in part from said perimeter of said one or more floor portions to bound an interior space; said one or more perforated piping portions extending through said interior space and coupled to one or more passageways through one or more of said wall portions; and a plurality of members coupled to said one or more floor portions and extending from said one or more floor portions to distance said one or more exterior surface portions of said one or more floor portions from a horizontally oriented surface when said plurality of members are in contact therewith. In addition to the foregoing, other method aspects are described in the claims, drawings, and text forming a part of the present disclosure.

Abstract: A filtration apparatus for curb vaults may be installed in existing vaults through manhole access openings whenever the smallest dimension of the access opening is greater than the smallest dimension measured across a support plate assembly of the filtration apparatus. An adjustable attachment system allows installation of the filtration apparatus by inserting the apparatus through the access opening.

Abstract: A flowing water splitting apparatus includes a first flowing water channel including a weir defining a water quantity of the flowing water flowing in from a confluent pipe and leading the flowing water flowing in from the confluent pipe to a dirty water pipe; a second flowing water channel leading flowing water flowing over the weir to a rainwater pipe; a partition wall portion provided to block the flowing water flowing through the first flowing water channel to form a plurality of water diversion chambers partitioned in the first flowing water channel; and a flow throttle portion formed in the partition wall portion to throttle a flow quantity of the flowing water flowing from one water diversion chamber into another water diversion chamber.

Abstract: Three flow paths within a single container are provided for the separation of contaminates, such as floating debris, heavy trash, lighter fluids and heavier fluids, from an effluent stream. A first flow path is provided for low flow conditions wherein the effluent stream pools in a first chamber within the container and the surface of the pooled fluid is drawn off, leaving heavy contaminates within the first chamber. The drawn fluid, with lighter and/or floating contaminates, enters a second chamber. The fluid is drawn from the second chamber below the surface level of the fluid, leaving the lighter and floating contaminates within the second chamber. In moderate flow conditions, a second flow path is established from the first chamber and out the container, bypassing the second chamber. Fluid for the second flow path is drawn from below the surface of the fluid in the first chamber to exclude light and floating contaminates.

Abstract: Modular storage and controlled outflow systems for controlling a flow of water and methods of assembly of modular storage and controlled outflow systems having indirect flow of water through the system. Modular systems for controlling a flow of water having beams extending across the modules to direct the flow of water in an indirect manner or a serpentine or semi-serpentine manner. Modular storage and controlled outflow systems for treatment and filtration of water.

Abstract: The storm drain with water trap is installed in the opening of a storm or sewer drain to close off the underlying drain channels and residual water therein from the open air, thus preventing escape of mold, mosquitoes, and other hazards into the air. The device has an insert having an open top and bottom. A shallow water trap pan is suspended below the insert. In dry conditions, the water trap contains little water, the relatively light weight of the trap and contained water allowing it to be lifted by springs against the bottom of the insert to form a seal. When runoff water flows into the drain, the greater amount of water and its weight draws the insert downward, extending the springs and opening a gap between the lower edge of the insert and the water trap pan to allow the runoff water to flow therethrough.

Abstract: Described herein are refuse collection systems for removing, collecting and extracting refuse from water run-off.

Abstract: Disclosed in this specification is a system for reducing runoff from an urban area into a body of water. In one embodiment, water flows from a sedimentation basin and into plurality of bioretention cells, each extended at an angle relative to the sedimentation basin. Overflow water flows from the plurality of biorention cells into an elongated filter. In another embodiment, a system for reducing run off from an elevated road is disclosed. The system includes an enclosure with a sedimentation basin and a biofiltration basin.

Abstract: An object of this invention is to provide an improved means of water treatment effectiveness. The invention strips floating and sinking particulates from flowing water with netting and inclined settling cells, which are arranged in an overlapping fashion to save treatment space. The effluent invert is virtually level with the influent invert to minimize pressure loss. The device pre-treats water for further treatment by filtering methods and among other application is ideally suited for applications where low depth profile treatment is beneficial or required.

Abstract: A stormwater gully comprises a chamber in which an outlet assembly is installed. The outlet assembly comprises filter units connected to an outlet housing. In use, stormwater can flow from the chamber in an upwards direction through filter units into the outlet housing. The outlet housing has an outlet, which extends from the gully. At high rates of flow, the water level in the chamber will rise until water can flow into the outlet housing through bypass inlets. The bypass inlets are connected to the interior of the housing by siphons defined by arched regions of a top cover. The siphons allow rapid discharge of water until the water level returns below the level of the bypass inlets. A slow drain down feature is provided which enables the chamber and outlet assembly to be drained below the level of the primary inlet.

Abstract: The steel-reinforced HDPE rain harvesting system collects, stores, and pumps harvested rain water for a variety of non-portable uses. The rain harvesting system includes either a horizontally disposed or vertically disposed steel-reinforced plastic cylindrical wetwell connected to an inlet pipe. The inlet pipe discharges rain water into a rain filter made from a pervious concrete manhole lined with a replaceable 20-micron filter cloth. The rain filter allows rain water into the storage section of the wetwell. A high water alarm is disposed in the rain filter and alerts maintenance personnel to clean the filter when needed. A submersible pump is housed in an HDPE pump sleeve outside the wetwell and conveys effluent from a forcemain at the wetwell's bottom portion to a target area. A level monitoring system disposed inside the wetwell selectively activates the pumping system. Maintenance hatches atop the unit are included.