Abstract: A removable culvert grate for placement adjacent the inflow end of a culvert. The grate includes a vertical grate having a plurality of slats to prevent the flow of beaver workings or similar debris therethrough, and a horizontal platform extending outwardly from the lower edge of the vertical platform. A linkage bar is provided extending from the upper edge of the vertical grate for connection to a power source such as a winch. The grate may be placed adjacent the inflow of a culvert, and, after beavers have constructed a dam or similar debris has collected against the vertical grate, the unit may be lifted by a winch carried in a pick-up truck or similar vehicle, carrying with it the debris.

Abstract: An adapter for pool drains, including a primary mounting frame secured onto the pool drain with a plurality of arms radiating inwardly and raised to interconnect the second mounting ring. There is further provided a grill work or second secured to the surface of the apparatus for defining a raised screening surface for screening any water flowing into the drain to prevent whirlpooling effect in the drain. Further, the apparatus is adapted for various size drains and is easily removable and set in place.

Abstract: In order to clean a screen in a waste water purification plant a surge of a body of water is generated by the agency of a dump flushing apparatus, which surge drops in a free fall towards the screen to be cleaned. This surge of cleaning water is given a dimensional extent which ensures for a substantially simultaneous impinging of the body of water onto the total extent of the screen. A framing which surrounds the screen encompasses this surge of water such as to guide the water and to force the water to flow through the screen. During the cleaning or flushing action the contaminants adhering to the screen, which contaminants are substantially of a thixotropic nature, will be removed from the screen and flushed through a sump towards the water purification section of the water purification plant.

Abstract: A test ring for a pump strainer is threadedly attached to both a housing and a cover of the strainer in such a manner that the cover can withstand relatively high internal pressure. When the test ring is detached from the cover, the cover is adapted for quick and easy removal from the strainer housing.

Abstract: Leader filter for being mounted at the top of a leader extending down the side of a building and below the discharge opening formed in the bottom of a rain gutter attached to the building adjacent the edge of a roof upon which rain falls, said leader filter for preventing entrance thereinto of leaves and other debris which cause leader clogging and the stoppage of rain flow through the leader, including a generally closed hollow leader filter including a top, two sides, a bottom, front and back, the sides are provided with a plurality of longitudinally extending, generally horizontally disposed rows of slots such that there is no generally vertical path of rain flow down said sides which is not interrupted by at least one of the slots, the slots are of a predetermined size sufficiently small to generally prevent the entrance thereinto and into the generally closed hollow leader filter of the leaves and other debris, the top is for receiving rain from the rain gutter discharge opening and for diverting the rai

Abstract: A device for processing fluid containing solid bodies is provided which comprises a separation tank with a strainer arranged therein, a fluid discharging suction unit connected to one side of the strainer, and a solid discharge mechanism connected to the other side of the strainer, whereby fluid containing solid bodies such as sludge is processed effectively through separation.

Abstract: A gutter assembly is provided which comprises an elongated, preferably transversely flexible sheet which when in an installed position extends along a building roof adjacent an edge of it, while extending below the roof edge. A pipe is provided which has a lengthwise extending slot which accommodates a side edge of the sheet through it adjacent an edge of the slot, while leaving room for entry of only water through the slot and into the pipe. A plurality of clips are dimensioned to be extendable outward from a surface of an edge strip of the sheet so that when the edge strip extends through the slot in the pipe, the clips can abut the inner surface of the pipe so as to retain an inside surface of the sheet against an edge of the slot. Preferably, the foregoing components are also dimensioned such that the sheet vertically supports the pipe. Such a gutter assembly inhibits entry of foreign matter into the pipe.

Abstract: A self-relieving bar screen, for intercepting debris moved by a liquid through a conduit into a space having a greater lateral dimension, includes a series of bars disposed in spaced lateral relation in a position normally opposite the discharge end of the conduit, with a lower, generally forwardly extending portion of each bar below the lower edge of the conduit and a generally upwardly portion extending up to opposite the upper edge of the conduit. The series of bars extend laterally past each side of the conduit but for a distance less than the width of the wall at which the conduit terminates. The side spaces thus provided permit liquid to flow to each side of the bars, in the event debris accumulates on the bars and may otherwise tend to obstruct the flow of liquid. The bar screen may be moved upwardly periodically with the debris collected thereby and emptied into a receptacle or the like, through a pivotal rake which is specially positioned.

Abstract: A fish diversion system for a penstock housing a hydroelectric turbine employs large area screens to shunt fish to a bypass conduit above the turbine. The screens are disposed generally lengthwise of the penstock and inclined upwardly at a shallow angle to maximize water flow velocity along the screens while minimizing the approach velocity normal to the screens. Fish and debris are thus swept along the screens rather than impinged on them. One embodiment uses two screens set end to end. The upstream screen can be tiltable for cleaning. A second embodiment uses a unitary elliptical screen in a cylindrical penstock. The bypass conduit is sized and positioned to minimize bypass water flow volume while maintaining sufficient volume and velocity to discharge fish from the upper portion of the penstock. A funnel-shaped bypass manifold connects the penstock to the bypass conduit.

Abstract: A fish diversion system for a penstock housing a hydroelectric turbine employs large area screens to shunt fish to a bypass conduit above the turbine. The screens are disposed generally lengthwise of the penstock and the upstream screen is inclined upwardly at a shallow angle to maximize water flow velocity along the upstream screen while minimizing the approach velocity normal to the screens. Fish and debris are thus swept along the screens rather than impinged on them. The bypass conduit is sized and positioned to minimize bypass water flow volume while maintaining sufficient volume and velocity to discharge fish from the upper portion of the penstock. The upstream screen can be tiltable for cleaning.

Abstract: An improved filter lift system including generally vertical filtering member with a plurality of generally vertical elements or rearward sloping elements, bars or strips of material positioned across a fluid stream, and teeth lift mechanism with teeth positioned between the filtering elements for lifting debris positioned forward, adjacent and upstream to the filter lift system. The debris removal means includes the teeth that lift and dump the debris and claws that clean and pull debris off the teeth. In phase one, the teeth lifting mechansim moves the teeth upward through a rearward sloping lower portion of the face of the filtering element to prevent compacting of debris below the teeth. The teeth lifting mechanism moves the teeth upward. In a second phase, the distal upstream portion of the teeth project out from between the filtering elements on the upstream side to pick up debris during the debris removal portion of the cycle of operation.

Abstract: A gutter guard and locking snap clip for the guard for use with rain gutters in order to prevent leaves and other debris from clogging the outlet of the gutter. The gutter guard is formed with louvre type slots to permit rain to pass therethrough to said gutter for runoff but prevent leaves or other debris from passing through the guard. The guard in one form of the invention is formed with at least one guide groove adjacent the forward edge of the guard. The guide groove is located in a plane below the plane of the adjoining surfaces of said guard and the clip can be moved through the groove. The clip is formed adjacent its leading end with at least one surface irregularity above or below the plane of said leading end, which is adapted to be engaged by or be positioned behind a reversely bent flange of the gutter return bead so as to removably lock the clip, and thus the guard, to the gutter.

Abstract: A self-cleaning screen and method for screening water for hydraulic turbine intake diversions is disclosed. A check dam is established across a river on the downstream side of a side channel weir which is at a lower elevation than the dam. A fish transport trough is laterally spaced from the weir at a lower elevation and has an inlet upstream of the weir and an outlet downstream of the dam. A screen having a concave profile is connected between the weir and the trough to remove debris from water flowing over the weir. Water flowing through the screen enters a separate channel under the screen for diversion to a hydraulic turbine inlet water application. Intermittent surges of water over the weir flush debris off the edge of the screen into the trough to clean the screen.

Abstract: Embodiments useful as means for inhibiting the accumulation of leaves and other debris in household rain gutters. Embodiments include structures which comprise a deflector having a sloped portion, the top edge region of which is adapted for juxtapositioning to the roof shingles, and the bottom edge region of which is arcuate through a large radius cross-section. In such embodiments, the farthest outward extension is outside the outermost edge of the associated rain gutter and the lower edge is positioned between the edges of the rain gutter. Embodiments include means for attenuating the force of water and reducing the localized concentrating of water flowing thereover, such as longitudinal ridges and/or means for improving the surface wettability.

Abstract: A bar screen with a screen cleaner has a vertically movable carriage with a rake pivotally connected thereto by pivot arms. A foldable lever assembly is pivotally connected to the carriage and to the pivot arms and assures a fully extended position and a folded position which correspond to a position of engagement of the rake with the screen and a position of disengagement of the rake with the screen, respectively. A lower stop engages the foldable lever assembly and moves it from a folded position to an intermediate folded position at the end of downward movement of the carriage and before the lever assembly reaches fully extended position so that the rake remains in a position of disengagement with the screen during downward movement of the carriage and is held in this position until the lever assembly is moved to fully extended position in response to upward movement of the carriage.

Abstract: A storm drainage system and a device for use in the system for restricting the rate at which water drains from an eavestrough is disclosed hereinafter. The storm drainage system includes a plurality of pitched roofed structures, a sewer service connection associated with each structure, a municipal sewer drainage system in direct fluid communication with the sewer service connection, an eavestrough system associated with each pitched roofed structure for collecting runoff therefrom and at least one downspout associated with each eavestrough system. The downspout has a through passage for conveying runoff water from its associated eavestrough to the sewer service connection.

Abstract: A gutter strainer having a central grid portion defining a plurality of openings for impeding passage of debris while allowing passage of water is provided for vertical mounting at any desired position within a gutter of the type having inturned flanges extending continuously along its upper edges.

Abstract: An eaves trough shield is disclosed which is used to prevent the clogging of a downspout of an eaves trough. The trough shield portion is formed from a plurality of spaced fingers sloped over the downspout opening. At one end, the fingers are attached to a bridge-plate located at the top of the trough near the downspout of the trough. At the other end, the fingers are attached to a bottom plate which rests in the bottom of the trough away from the downspout. Flanges located at each side of the bridge-plate are used to secure the trough shield to the trough. When debris enters along the trough, it is moved to the trough shield by the action of water in the trough and deposited on the fingers. Later, after the debris has dried, it is blown off of the shield and out of the trough by the wind.

Abstract: In a nuclear reactor, a drainage channel for the safety injection and spray circuits of the reactor is arranged in the bottom of the annular gap between two substantially vertical walls surrounding the pressure vessel of the reactor, the drainage channel comprising filter panels disposed vertically along each side of a central horizontal solid lower panel at the bottom of the annular gap and between two lateral horizontal solid upper panels so as to bound a central channel having vertical lateral filter walls communicating with two lateral chambers which communicate by substantially horizontal passages with a central collecting chamber disposed below the central lower panel and having an outlet for connection to the main intake of the safety circuit.

Abstract: In a dam comprising a plurality of support posts, said posts being substantially uniformly spaced with respect to one another and having a predetermined pitch spacing, a flexible web having a central body portion and upper and lower marginal edge portions, the improvement wherein said marginal edge portions are uniformly shortened along the length thereof to a length which is less than the unshortened length of the central body portion by a factor of 2/.pi..

Abstract: Disclosed herein is an improved balance control water screen wherein the linkage associated with the balanced waste door is contained within the walled trough structure so as to provide a minimum number of linkage elements. Further improvements relate to a single walled construction and a simplified water sealing arrangement so that the water control screen is more efficient and economical.