Abstract: The invention described herein is that of an outdoor drain filter useful for maintaining the operability of an outdoor drain despite the accumulation of debris that would otherwise obstruct the outdoor drain, resulting in flood prevention of surrounding areas. The outdoor drain filter of the present invention is placed above and around an existing outdoor drain or may be integral with a drain cover or drain reservoir. The outdoor drain filter comprises upper and side filtration means allowing the free flow of water therethrough. The outdoor drain filter further comprises a diverter comprising at least one air vent and at least one lateral pipe that defines a maximum water level to which water will accumulate around the outdoor drain before being diverted into the drain through the diverter. The outdoor drain filter may a manufactured unit or of modular construction.

Abstract: A two-stage filtering drain cover that can be retrofitted to an existing, original construction, areaway drain cover. The filtering drain cover of the invention inhibits the accumulation of debris on the existing drain cover, and passage of debris into the drain, and helps to prevent clogs and flooding. The outer cover member of the device is configured with passages that permit liquid flow through the outer cover while filtering larger size debris particles that may be entrained in the passing liquid. A perimeter wall on the outer cover and with similar liquid flow passages stops larger debris from passing the outer cover. An inner filter member fits within the outer cover and is configured with relatively smaller passages to obstruct smaller sized debris that may have penetrated the outer cover from passing into the drain.

Abstract: A cover for water flow inlet for rainwater drainage of roof and buildings is disclosed. The inlet cover comprises an outer formation forming a plurality of ridged fins to avoid the vortex formation of rainwater entrainment and to protect the cover from debris materials and a central plate member. The central plate member has a profiled lower surface. The plate member is of an inverted shape with a plurality of ridged formation or channels on the lower surface to further eliminate formation of air inducing and vortices, therefore promoting high volume laminar flow of water in the inlet pipe of the drainage system.

Abstract: A two-stage filtering drain cover that can be retrofitted to an existing, original construction, areaway drain cover. The filtering drain cover of the invention inhibits the accumulation of debris on the existing drain cover, and passage of debris into the drain, and helps to prevent clogs and flooding. The outer cover member of the device is configured with passages that permit liquid flow through the outer cover while filtering larger size debris particles that may be entrained in the passing liquid. A perimeter wall on the outer cover and with similar liquid flow passages stops larger debris from passing the outer cover. An inner filter member fits within the outer cover and is configured with relatively smaller passages to obstruct smaller sized debris that may have penetrated the outer cover from passing into the drain.

Abstract: A strainer for a floor sink and a floor sink strainer assembly. The strainer includes a central body defining a perimeter and further includes a generally planar flange extending outwardly from the perimeter of the body. The flange has a shape and size corresponding to the size and shape of the bottom wall of the floor sink. As a result, the strainer is constrained from lateral movement and lifting during a high influx of water.

Abstract: Disclosed herein are catch basin grate covers comprising a frame; a grate; a heating element in thermal communication with the grate cover; and a power source in electric communication with the heating element. Also disclosed are catch basin grate covers comprising a frame; a grate; means for heating the grate cover; and means for supplying power to the means for heating. Also disclosed are methods of preventing the clogging of a catch basin grate cover due to ice, the method comprising applying electricity to the heating element of the above grate cover, whereby the resulting heat from the heat element causes the ice to thaw, thereby unclogging the catch basin grate cover.

Abstract: Embodiments include controlled flow rood drains which minimize the size of drainage piping and meet established maximum flow rates by draining built-up water from a flat roof. Embodiments are pre-set by the manufacture in terms of the diameter of the standpipe orifice, which controls maximum flow rate at a predetermined depth of water on the roof, and the height of the standpipe, which determines the depth of water on the roof. Embodiments resist alteration of the flow rate by vandals, tenants, or managers of the building, and are resistant to flow which bypasses the drain control and resistant to plugging by roof debris or snow.

Abstract: In a floor drain assembly of the type including a floor drain having a collar surrounding a drainage opening installed in a recess in a floor, an improvement is provided. The improvement includes a skirt extending about the collar and secured to the collar by a fastener extending through the skirt and into the collar but not into the floor. The skirt defines an opening sized to receive a treatment material therein. A lid is configured for selectively engaging with the opening for allowing selective placement of treatment material in an area beneath the skirt.

Abstract: A debris trap for a drain includes an annular rim, defining a center, with a plurality of radial prongs, extending from the rim toward the center, and oriented to catch debris in the drainage pathway. The debris trap is removably disposable within a drainage pathway of a drain body, below a removable drain grate thereof.

Abstract: A screen assembly for receiving high volumes of water flowing from a roof to a gutter. The screen assembly has a first support frame having an upstanding rim extending around a periphery thereof and being construed to be mounted on the gutter and secured to an adjacent portion of a roof fascia. The first support frame has an opening in a bottom surface thereof that is constructed to be disposed over a gutter opening when the first support frame is mounted on the gutter. The screen assembly has a second support frame having a screen secured thereto and extending over the second support frame. The second support frame has a shape corresponding to that of the first support frame and is mounted thereon in close relationship to and within the upstanding rim of the first support frame, the second support frame being connected to the upstanding rim.

Abstract: A movable filter grid for a drain inlet has a drain grill, an annular seat and an annular fastener. The drain grill has an annular plate and multiple support ribs. A first end of each support rib is connected to an outer circumferential edge of the annular plate, and a second end of the support rib radially extends outwards from the annular plate. An inner wall of an annular seat is securely connected to the second ends of the support ribs. The annular fastener has multiple pin holders annularly connected. Each pin holder has a through hole vertically formed through the pin holder and detachably mounted through by a pin. When the movable filter grid is applied to drain inlets on different terrains, the pins taking the form of a grating can prevent debris from blocking the drain holes.

Abstract: In a floor drain assembly of the type including a floor drain having a collar surrounding a drainage opening installed in a recess in a floor, an improvement is provided. The improvement includes a skirt extending about the collar and secured to the collar by a fastener extending through the skirt and into the collar but not into the floor. The skirt defines an opening sized to receive a treatment material therein. A lid is configured for selectively engaging with the opening for allowing selective placement of treatment material in an area beneath the skirt.

Abstract: A securable drain screen is provided having a rectangular frame, a lockable screen door, and upstanding screen sidewalls forming a rectangular trap with an open upper that is adapted to block large debris from entering a drain and clogging the same when deployed. Along the perimeter of the frame and positioned against each sidewall exterior surface is an extendable footer element that is threadably attached thereto and extendable outwards for bearing against the interior surface of a drain. The footers bear against the drain interior and securably position the assembly within the drain, while the lockable screen door therethrough is hinged for access through the device when snaking the drain. The hinged door includes a padlock latch for securing the door in a closed position, whereby only authorized users can remove the screen from the drain once deployed.

Abstract: A movable filter grid for a drain inlet has a drain grill, an annular seat and an annular fastener. The drain grill has an annular plate and multiple support ribs. A first end of each support rib is connected to an outer circumferential edge of the annular plate, and a second end of the support rib radially extends outwards from the annular plate. An inner wall of an annular seat is securely connected to the second ends of the support ribs. The annular fastener has multiple pin holders annularly connected. Each pin holder has a through hole vertically formed through the pin holder and detachably mounted through by a pin. When the movable filter grid is applied to drain inlets on different terrains, the pins taking the form of a grating can prevent debris from blocking the drain holes.

Abstract: A device configured for being received within a floor drain is provided. The device includes a basket assembly containing a liquid-soluble treatment material therein. A drain cover defines an opening that receives the basket assembly. A basket assembly lid defines at least one aperture for allowing flow of liquid into the basket assembly, the basket assembly includes a flange for cooperatively engaging a recess defined in the drain cover to thereby engage the lid with the drain cover.

Abstract: A weir grate (10, 100) comprises a base tray (12, 112) having an outlet (14, 114), and an infill tray (16, 116) positionable in the base tray. The base tray comprises a plurality of discretely positioned posts (22, 122) projecting upwardly therefrom in use. The infill tray comprises a plurality of correspondingly positioned locators (40, 140) projecting downwardly therefrom in use. Each locator is arranged for engaging with a respective post when the infill tray is positioned in the base tray.

Abstract: A plate is positioned across an inlet to a catch basin and a filter strainer is inserted through an opening through the plate and into the basin. A tertiary filter completely surrounds the strainer and is suspended below the plate. Surface water flows through a primary grate that covers the catch basin, through the strainer and through the tertiary filter. The tertiary filter comprising fibrous filter media retained in a non-woven mesh fabric enclosure and the filter media is selected according to the type of contaminants that are to be removed.

Abstract: A street curb filter apparatus can be attached to a street curb side adjacent a manhole to collect storm water runoff from the curbside and direct the collected storm water through a filter basket. The street curb filter has a street curb shelf with a water channel on the surface thereof and filter basket supporting arms. The filter basket supporting arms are positioned to receive collected storm water runoff from the water channels in the street curb shelf. The filter basket is shaped to fit into a storm water manhole opening and is removably attached to the street curb shelf filter basket arms to receive storm water runoff from the water channeling surface.

Abstract: A floor water tank filtering device for three-in-one sewers comprises a tank body having a receiving space at an interior thereof; a bottom of the tank body being formed with a drain hole; a filtering grid being installed at the drain hole; a top of the tank body being combined with a cover plate; the filtering grid being combined at an upper side of the drain hole of the tank body; a top of the filtering grid being provided as a supporting point of the cover; and the cover being formed by a plurality of cover plates; the cover plate being located an inner side of a top of the tank body; the cover being supported by the filtering grid so that the plurality of cover plates are formed as a plane to be placed upon a top of the tank body.

Abstract: A storm drain inlet filter for preventing passage of particulate and solids in storm water entering a storm drainage system through an entry aperture. The device features a filter element held in place by a ring compressed against the sidewalls forming the entry aperture. Filter fabric may be included between two sidewalls fo the inlet filter.

Abstract: A floor drain having a drain body that receives a rotatable frame with a grate. The orientation of the grate and frame about an axis of the drain body may be adjusted by rotating the frame relative to the drain body and clamping the frame in the desired orientation. Adjustments to the orientation of the grate and frame can be made to align the grate and frame with floor tiles or other flooring materials and with walls surrounding the floor drain.

Abstract: Floor drain with water trap including an upper screen (19) or lip and a lower screen or threshold (32) extending to a higher level (29) than the lower edge of the upper screen, and that the water first flow below the upper screen and thereafter over the lower screen. The inlet part before the upper screen has a small cross-section or volume in relation to the water volume between the upper and the lower screen securing an efficient flushing away of light pollutions.

Abstract: A temporary culvert barrier for placing across the mouth of a culvert for blocking litter and debris from entering or exiting the culvert and for filters to block silt or sand from clogging the culvert or the drain area. The filters may also be selected to absorb oils salts or other chemicals. The temporary barrier is easy to install and remove. The barrier plates and filters fit to the size of the culvert mouth and have adjustment slots for different width mouths. The culvert barrier may be used to prevent pollution at construction sites and be temporarily or permanently attached to culvert mouths. The filters may be changed or cleaned as required.

Abstract: A disposable drain strainer is removably received within a drain opening having an adjacent drain rim substrate. The strainer has a strainer portion, a ring portion, and a seal release mechanism. Top and bottom surfaces of the ring portion are adapted to sealingly engage the drain rim substrate. The seal release mechanism is integral with the ring portion, and facilitates release of the seal so that the strainer can be readily be removed from the sink and discarded. In one aspect, the seal release mechanism comprises a tab. In another aspect, the seal release mechanism comprises a press-release component, wherein the ring portion has arced ring walls having convex and concave configurations. During sealing engagement with the drain rim, the ring portion is in the convex configuration. Pressure applied to the ring portion causes it to move to the concave configuration.

Abstract: A catch basin filter having apertures and holding a silt barrier material may be securely attached to a drop inlet grate. The catch basin filter has apertures for preventing debris from entering the drop inlet and clogging sewers. A silt barrier material wrapped around the catch basin filter housing provides a study and stable platform for holding the filter in place around the drop inlet such that silt will not be able to enter the sewer and clog it up. The catch basin filter is quickly and easily attached to and removed from the drop inlet by a rod having a hook for extending through the grate bars and then turning the rod to engage the bars on the drop inlet grate to hold the catch basin filter in place. The catch basin filter is durable and reusable and the silt filter material may be easily replaced.

Abstract: A temporary trap having baskets and optionally filters in the baskets used in conjunction with curb inlets for sewer systems to keep debris from being washed into the sewer during construction of roads and sewers. The trap is a box, typically rectangular, square or round, with baskets having a plurality of holes therein for allowing water to pass therethrough while trapping debris therein. The trap is inserted into a curb inlet by lifting the grate off the curb inlet frame, inserting the trap and then replacing the grating. After a rain the baskets and filters may be cleaned out and reused. Optionally, when the construction project is finished the grate is lifted off the curb inlet frame and the trap removed. An optional cloth filter for insertion into the trap filters finer debris from entering the sewer system. The trap has an overflow opening in case the trap becomes clogged.

Abstract: A rainwater surface drain for use in roof drains comprises a substantially funnel-shaped reservatory for water to be drained and covered with an upper strainer or grating member downstream of which an eddy preventing insert means in the form of a flat grate member is disposed at a short distance upstream of a discharge outlet on the bottom side of the reservatory which is connected with an outlet pipe.

Abstract: A drain filter device includes a body formed from wire mesh having a plurality of side edge portions integral with each other and forming a substantially square shape. The body further has substantially planar top and bottom surfaces and includes a plurality of elongated support rods having opposed end portions extending along the plurality of side edge portions respectively. The device further includes a top section having a substantially cylindrical shape and connected to the body. The top section is adaptable to be positioned substantially centrally about drain and for filtering out particulate materials suspended in water entering the drain. Advantageously, the top section traps and maintains particulate materials about a perimeter of a drain and not directly above same.

Abstract: A process for use in a phosphate ore beneficiation process to minimize the long-term environmental impact of the use of petroleum based hydrocarbon materials mixed with fatty acid based primary floatation reagents for froth flotation in the flotation of phosphate ores, wherein the process comprises substituting the petroleum based hydrocarbon materials with methyl and/or ethyl esters of fatty acids.

Abstract: A method of recovering a valuable component from a feed slurry in minerals processing plant for a mined material is disclosed. The method includes separating the feed slurry on the basis of particle size into at least two streams, of which one stream is a fines stream. The pH of the fines stream is then adjusted to be within a range in which contaminants on the surface of the fines are soluble so that contaminants dissolve from the surface of the fines. Thereafter, the valuable component is floated from the pH adjusted fines stream.

Abstract: A clog-free roof drain cover assembly includes a first drain cover fixed over the drain, and a second drain cover which is vertically movable relative to the first drain cover. The second drain cover includes a base provided with weep holes, a skirt located above the weep holes, a hat-shaped portion provided with slots, and a foam ring about the hat-shaped portion. During light rains, water flows under the skirt and through the weep holes, into the first drain cover, and into the drain. During heavy rains, debris becomes caught in the debris skirt. When the pooling water reaches a predetermined level, the foam ring floats, raising the second drain cover, which causes the debris skirt to lift the debris about the drain and permit water to pass freely underneath, into the first drain cover, and down the drain.

Abstract: A constitution comprises separated processing of an abrasive grain waste liquid into recycled abrasive grain and a fine abrasive grain mixed liquid in a first centrifugal separator, adding a fresh cutting liquid to the fine abrasive grain mixed liquid to direct the resulting liquid to a second centrifugal separator to subject the same to separated processing in the second centrifugal separator, into waste abrasive grain and a recovered cutting liquid directing the recovered cutting liquid through a recovered cutting liquid tank to a recovered abrasive grain tank, adding fresh abrasive grain and a cutting liquid for dilution to the recovered cutting liquid in the recovered cutting liquid tank and to the recycled abrasive grain to create a recycled abrasive grain mixed cutting liquid, and feeding the recycled abrasive grain mixed cutting liquid to an abrasive grain supply tank.

Abstract: A temporary silt guard for temporarily enclosing the open upper end of a drop inlet during the construction of a road system in commercial and residential developments is adapted to fit over and seat upon the open end of the drop inlet to enable runoff water to drain into the drop inlet while preventing silt and debris from being carried into and collected therein. The silt guard includes a body portion formed from a series of spaced slats defining radially spaced passages through the silt guard. A filter cover is received over the silt guard, formed from a silt screen material, with the slats of the body portion providing rigidity and strength to the filter cover. The filter cover filters out silt and debris while enabling storm water and runoff to drain into the drop inlet.

Abstract: A silt guard apparatus for filtering runoff water, including a fluid distributing pan coupled to a silt guard or filtering device. The silt guard apparatus is fitted over and seated upon a drainage pipe for controlling erosion at construction sites and for trapping and preventing oily residues and/or solid particles such as silt and other debris from being washed into, collected or being otherwise deposited within a water drainage pipe with the runoff water, while still enabling water to drain therethrough. The fluid distributing pan of the present invention includes an orifice, and may further include a fluid receiving body surrounding the orifice and a connecting member contiguous with the fluid receiving body. The connecting member functions to couple the silt guard to the fluid distributing pan to form the silt-guard apparatus, which in another embodiment is interconnected and substantially sealed to the drainage pipe.

Abstract: A superimposed drain cover is provided. The drain cover includes a tubular seat secured to the top of a cement drain, an outer ring engaged on the top of the seat having a tapered outer periphery and a cobweb surfaced cover covering on the top of the seat inside the outer ring. It is characterized that further has a plurality of cushion pieces and the spare superimposed rings which can be added between the seat and the cover so as to keep the cover even with a road surface without causing a traffic accident or traffic noise.

Abstract: A temporary silt guard for temporarily enclosing the open upper end of a drop inlet during the construction of a road system in commercial and residential developments is adapted to fit over and seat upon the open end of the drop inlet to enable runoff water to drain into the drop inlet while preventing silt and debris from being carried into and collected therein. The silt guard includes a body portion formed from a series of spaced slats defining radially spaced passages through the silt guard. A filter cover is received over the silt guard, formed from a silt screen material, with the slats of the body portion providing rigidity and strength to the filter cover. The filter cover filters out silt and debris while enabling storm water and runoff to drain into the drop inlet.

Abstract: An insert for use in a drain basin, comprising an outer wall defining a periphery of the insert and having a top edge and a bottom edge. A perforated bottom surface extends across the lower periphery of the insert. A filter, resting on the perforated bottom surface, has a peripheral edge enclosing a central portion. A flange extends inwardly from the top edge of the outer wall past the peripheral edge of the filter. The flange directs drainage water past the periphery of the filter and to its more central portion, whereupon impurities within the drainage water are extracted and filtered water exits through the perforated bottom surface into the drain basin. In a preferred embodiment of the invention, the inward-extending flanges are angled downward toward the filter. In a second embodiment, the filter, bottom surface and inward-extending flanges are arranged in a cartridge, which is removably placed inside the periphery of the outer wall.

Abstract: A temporary silt guard for temporarily enclosing the open upper end of a drop inlet during the construction of a road system in commercial and residential developments is adapted to fit over and seat upon the open end of the drop inlet to enable runoff water to drain into the drop inlet while preventing silt and debris from being carried into and collected therein. The silt guard includes a body portion formed from a series of spaced slats defining radially spaced passages through the silt guard. A filter cover is received over the silt guard, formed from a silt screen material, with the slats of the body portion providing rigidity and strength to the filter cover. The filter cover filters out silt and debris while enabling storm water and runoff to drain into the drop inlet.

Abstract: The present storm drain filter comprises a tubular housing with a solid vertical surrounding wall and sized for being recessed inside a storm drain. The housing is supported in the drain by a flange around its top edge. A tubular cartridge is detachably attached to a solid annular bottom plate of the housing. The cartridge comprises a solid annular top cover coaxial with a solid annular bottom closure; vertical tubular inner, intermediate, and outer screens concentrically connected between the top cover and bottom closure; and filter media enclosed between the screens. A central overflow opening inside the inner screen is aligned with a hole on the bottom plate of the housing. An annular debris trough is defined between the cartridge and the housing. Debris flowing into the filter is collected in the trough. As the level of debris rises and obstructs the lower part of the outer screen, the unobstructed upper part of the outer screen continues to filter the water.

Abstract: A well screen for preventing contaminants such as debris, pests, and insects from falling into the well water. The well screen includes a barrier having top and bottom faces with a plurality of apertures therethrough. A plurality of elongate hanging arms are upwardly extended from the top face of the barrier. The hanging arms each have an outwardly extending upper extent.

Abstract: A drain insert for the drain inlets of storm water sewer systems comprises an outer housing, an inner sleeve integrally formed with and extending within the outer housing, a support hanger carried by the outer housing and adapted to rest atop a concrete flange at the mouth of the drain inlet, and, a collar member which rests atop the concrete flange and at least partially overlies the inner sleeve to direct all run-off water into the interior of the drain insert.

Abstract: A novel filter assembly for a drainage system stormwater catch basin is provided with spaced-apart open frame elements that are joined to and carry a singular mesh fabric filter element, and with manually pivotable support leg elements that permit the assembly to be collapsed for subsequent transportation, storage, or refurbishing.

Abstract: A temporary silt guard for temporarily enclosing the open upper end of a drop inlet during the construction of a road system in commercial and residential developments is adapted to fit over and seat upon the open end of the drop inlet to enable runoff water to drain into the drop inlet while preventing silt and debris from being carried into and collected therein. The silt guard includes a body portion formed from a series of spaced slats defining radially spaced passages through the silt guard. A filter cover is received over the silt guard, formed from a silt screen material, with the slats of the body portion providing rigidity and strength to the filter cover. The filter cover filters out silt and debris while enabling storm water and runoff to drain into the drop inlet.

Abstract: A temporary silt guard for temporarily enclosing the open upper end of a drop inlet during the construction of a road system in commercial and residential developments is adapted to fit over and seat upon the open end of the drop inlet to enable storm runoff water to drain into the drop inlet while preventing silt and debris from being carried into and collected therein. The silt guard includes a body having a filter box portion formed from a series of radially spaced slats. A silt screen material is encircled about at least the slats of the filter box portion and secured to the body portion, with the slats providing rigidity and strength to the silt screen material. The silt screen material filters out silt and debris while enabling storm water and runoff to drain into the drop inlet.

Abstract: To retain water on roofs of buildings with a water-retention basin, a vortex-type throttle valve is fitted on the roof and is connected to a drain pipe leading to a drain. The throttle valve makes it possible to control rainwater run-off at a given rate determined by the size of the throttle valve. If rain falls at a high rate, the excess is retained. Overflow protection is provided by fitting on top of the throttle, a length of pipe which permits the unrestricted flow of water through the throttle valve. Alternatively, the drain pipe can be extended upwards to the maximum permitted water-retention level, thus allowing the water which exceeds this level to pass directly into the drain pipe.

Abstract: A catch basin splash guard for inhibiting water impacting the catch basin side walls, comprising an upper rim section defining an opening of about the same shape as that of the catch basin frame, the rim section adapted to rest on the frame lip; and depending side walls projecting down from the rim section at essentially 90.degree., to define an outlet of about the same size as the opening so as not to obstruct water flow through and out of the splash guard; wherein the side walls direct water flowing into the catch basin away from the catch basin walls and down toward the catch basin bottom, to inhibit wall corrosion and erosion caused by incoming water.

Abstract: A removable storm drain filter to be used in combination with an absorbent media, and a catch basin having grated inlet and standpipe outlet to remove pollutants carried in surface drainage. The storm drain filter is designed to fit within a catch basin, below the grated inlet, and upon the upward terminus of a vertical stand pipe. A filtration vessel (50) is provided to contain absorbent media and to provide a primary flow path through the absorbent media and a secondary flow path (bypass) for high flows. The filter includes a cover plate (70), structurally supported by and above the filtration vessel, to prevent deposition of sediment upon the absorbent media and to prevent direct striking of the absorbent media by influent storm water. The storm drain filter further includes a floatables screen (60) to prevent clogging of the absorbent media by floating debris such as leaves, pine needles, and cigarette butts.

Abstract: An annular ring and cap that are positionable within a manhole or catch basin structure above the base of the manhole or catch basin to reduce the amount of debris entering into the manhole or catch basin. The annular ring may be positioned within the manhole or catch basin such that a flange of the annular ring is sandwiched between the base and support frame. When a final grade surrounding the manhole or catch basin is complete and the cover or grating is positioned above the support frame, the cap then serves as a secondary restriction thereby deterring access to underground conduits that are linked to the manhole or catch basin. A plurality of corrosion resistant locking members secure the cap against a ledge of the annular ring. The annular ring further has an inner edge of the ledge that includes first and second shoulder clearance indentations aligned opposite each other.

Abstract: A water collection trough has an edge arranged in the plane of a roof and a bottom, arranged with spacing from the edge, with an opening. The opening leads to a drainage pipe mounted down at the bottom of the trough. Two parallel plates are arranged spaced apart, a lower plate being fixed in the water collection trough and an upper plate being fixed above the edge of the water collection trough. The edge of the upper plate projects beyond the edge of the water collection trough in such a way that, to form a closed flow in the drainage pipe. The water to be led away is accelerated ahead of the edge of the water collection trough and, after a two-fold deflection of about 90.degree. in each case, ahead of the opening in the bottom.

Abstract: A skimmer cover for a secondary dispersement system orifice in a storm water catch basin prevents inflow of floatable materials, and especially hydrocarbons from motor vehicles, from entering the orifice. The orifice is defined in a neck extending spacedly above the bottom of the catch basin surface to carry the skimmer cover. The skimmer cover provides a top with a peripheral skirt diametrically larger than the neck and supported on the neck to depend therebelow to a point spacedly above the catch basin bottom surrounding the neck. An internal cylinder depends from the cover top within the skimmer cover skirt and defines plural spaced orifices to allow fluid passage therethrough and into the orifice defined by the neck. A depending fastening structure having opposed pivotal lever arms moved by a medial screw therebetween is carried by the skimmer cover top to allow releasable fastening of the skimmer cover within the neck orifice for positional establishment and maintenance of the skimmer cover thereon.