Abstract: A barrel type fish and/or particulate screen includes mesh stretched over a supporting cylindrical shell having closed ends. The closed interior opens to a fluid withdrawal conduit, which is connected to an outlet. An inner, substantially conical withdrawal manifold is provided with the base of the substantially conical withdrawal manifold connected to the withdrawal conduit and the manifold extending substantially the axial length of the cylindrical mesh. The substantially conical withdrawal manifold defines uniformly sized and arrayed flow apertures. These flow apertures have the same unit area per unit length of the substantially conical withdrawal conduit. This same unit area per unit length produces within the withdrawal manifold, a substantially constant velocity at all cross-sections of the manifold taken normal the flow along the major axis of the substantially conical shape. Flow velocity distribution through the metal mesh is maintained uniform at all rates of flow through the device.

Abstract: A water filtering system includes: a water intake system including a plurality of inlets in fluid communication with a water intake pump; and a containment/exclusion boom including (i) a support system positioned in a body of water, (ii) a curtain including a sheet of flexible fabric material that allows movement of water therethrough, the curtain having upper and lower ends with the upper end being connected to the support system, and (iii) means for maintaining the lower end of the curtain substantially against the floor of a body of water; wherein the curtain surrounds substantially all of the plurality of inlets and wherein, upon operation of the water intake pump, water is drawn through the curtain at which time the water is filtered, and subsequently filtered water is drawn through the plurality of inlets for delivery into the water intake system.

Abstract: A mitred grate and drain cover comprises a peripheral edge having an upper and lower surface and a substantially elliptical shape which defines a space, and a plurality of cross pieces within the space. Depending sidewalls extend from the lower surface of the peripheral edge, and are constructed with respect to the peripheral edge such that they are at an angle other than 90° to the peripheral edge. The sidewalls define a space for receiving a pipe.

Abstract: A filter canister including a frame; a sheet of flexible fabric material that allows the flow of water therethrough, the sheet of flexible fabric material being connected to the frame in a manner defining an internal zone whereby substantially all fluid entering the internal zone from an opposite side of the sheet of flexible fabric material passes therethrough; and a conduit having a first end located externally of the frame and a second end located within the internal zone defined by the sheet of flexible fabric material; wherein, upon connection of the first end of the conduit to a fluid intake system, fluid is drawn through the sheet of flexible fabric material into the internal zone, thereby filtering the fluid, and filtered fluid is drawn through the second end of the conduit for delivery into the fluid intake system. A system and method for filtering fluid intake water are disclosed.

Abstract: An apparatus for separating animated objects such as fish or other objects between a non-diverted and diverted fluid stream. Embodiments may include a screen or similar selective pass through device that is arranged in a manner that is generally horizontal (more horizontal than vertical). The non-diverted flow preferably passes over the screen while the diverted flow passes through the screen. Aspects of the apparatus may include faster sweeping velocity than pass through velocity, tapered side or bottom walls, a depressed low flow channel, a distributed under screen reservoir that facilitates distributed fluid flow through the screen or like device and various downstream flow control devices or configurations, amongst other aspects.

Abstract: A strainer for immersion in liquid, especially shallow water, to prevent debris from entering a pump connected by a suction pipe to the interior of the strainer. The strainer has a cylindrical housing that is closed at the bottom and covered by a circular screen at the top. As the pump sucks water, the screen prevents debris from being sucked into the strainer interior along with the water. Debris drawn against the screen's exterior is dislodged by a rotating spray arm that contains nozzles and is disposed within the strainer interior to spray water against the screen. The water is fed under pressure to the spray arm through a separate supply line tapped into the pump's outlet. The spray arm nozzles are aimed to direct water generally upward through the screen to dislodge the debris and to cause the spray arm to rotate. Hence, as the spray arm spins, the water washes substantially the full face of the screen.

Abstract: An inlet screen for an ocean thermal power plant has an outer side parallel to the ocean current and a plurality of parallel bars extending at an acute angle to the horizontal, wherein the acute angle opens toward the upstream direction of the current. The total area of through openings in the inlet screen receive the predetermined flow requirement of the power plant at a velocity no greater than 0.5 feet per second, so that fish are not sucked against the screen. The vertical spacing between the bars is no greater than one-half of the inner diameter of tubes in heat exchangers in the plant. The spacing between bars is at a minimum at the outer side of the screen, and the spacing increases between the outer side and the inner side, so that objects do not become wedged between the bars. The inlet screen extends sufficiently below the ocean level to accommodate the plant's water flow requirement at a velocity of no greater than 0.

Abstract: A beaver controlling culvert attachment prevents beavers from disturbing the flow of water through a culvert. An upstream unit includes a vertical pipe having an upper grate, which prevents the entrance of beavers and debris, while allowing the entrance of water during periods of high water levels. A horizontal pipe has an upstream end attached to an upper portion of the vertical pipe and a downstream end attached to an upstream end of the culvert by an attachment plate. A basket insert is carried within the vertical pipe, and is movable between an in-use position, wherein a grate prevents entrance to the bottom of the vertical pipe, and a clean-out position wherein the grill is elevated to allow disposal of accumulated debris through the horizontal pipe and culvert. A downstream grate prevents beavers from entering the downstream end of the culvert, and from filling the culvert with debris.

Abstract: A pumping pant which is more compact in size and has reduced total costs required for construction work of the pumping plant and associated civil engineering works and has a shorter term of the entire construction work includes a pump building which is constructed in its entirely as an island-type building in the form of an island in a suction pond serving as a pump well, whereby the need to refill earth and sand around the pump building is eliminated, and the cost of associated civil engineering works is reduced. Water is sucked from all sidewalls of the pump building, and pumps are arranged within the pump building in at least two rows, resulting in a reduced length of the building. Horizontal portions of a suction pipe and a delivery pipe are extended from the pump in the same direction to reduce a width of the building and to make it compact. A total cost required for the construction of the pump building and associated civil engineering works can be thus reduced.

Abstract: A storm-water control header for a culvert has a vertical head-wall with a thimble on the downstream side, and an adjustable inlet control device including a weir on the upstream side. The thimble is positioned within the culvert, and passes water from the weir to the culvert. A low flow section at the inlet control device allows water to pass from the bottom of the device at a low controlled rate to the culvert. A cover on the top of the control device excludes floating matter from the culvert.

Abstract: A segment 20 has segment units 22 obtained by dividing a cylindrical body having an appointed length into four sections along the circumferential direction. The segment units 22 are provided with a segment body 22a, a porous concrete layer 22b, water intake pores 22c, and clogging members 22d. The segment body 20a is constructed of a cast iron plate or steel plate and has an inwardly recessed portion on its outer circumferential surface. The concrete layer 22b is a porous material having water permeability, and is filled and solidified in the inwardly recessed portion 201a. The water intake pores 22c are formed on the flat bottom of two recessed portions 201a so as to penetrate the bottom, and are provided in a plurality along the circumferential direction with an appointed interval.

Abstract: A telescoping weir for the controlled drainage of contaminated bodies of water, such as confined disposal facilities (CDF), which selectively releases only the relatively clean water while leaving behind a contaminated portion. The weir includes a foundation that is anchored to the bottom of the body of water and connected with a discharge pipe, a cylindrical telescoping portion connected with the discharge pipe and extending upwardly from the foundation and terminating adjacent to the surface of the body of water, and a set of mechanical jacks for selectively extending and retracting the upper end of the telescoping portion above and below the water surface in order to selectively drain a top layer of clean decant water therefrom.

Abstract: A method and apparatus for controlling zebra mussels and other bivalves using UV light from a medium pressure UV lamp which is located in a chamber having therein water in which the bivalves are located. The medium pressure UV lamp provides an intensity of UV light measured at a wavelength of 254 nm of at least approximately 6830 .mu.W/cm.sup.2 in the water. The medium pressure UV lamp provides a dose of UV light measured at a wavelength of 254 nm of at least approximately 0.1 W.sec/cm.sup.2 in the water.

Abstract: A method of managing ponds that have standpipe overflows, such method including installing of a capped sleeve over the standpipe with the horizontal area between the wall of the sleeve and the wall of the standpipe being equal to or greater than the horizontal cross-section area of the standpipe. Opening a valve in the top of the standpipe to allow normal flow of the water from the pond through the standpipe by equalizing atmospheric pressure on the interior and exterior of the capped sleeve. Closing the valve in the cap of the sleeve to allow the water flow to create a vacuum in the top of the capped sleeve thus increasing water flow through the standpipe to full capacity. The draw down can continue until the interior vacuum is broken by the water reaching the bottom of the sleeve or the valve can be opened prior thereto to stop the draw down at any desired level.

Abstract: With a method for constructing a water intake pipe, a vertical shaft 10 is constructed, and a shield tunnel 12 is constructed by causing a shield driving machine to advance from the vertical shaft 10 toward a seashore by breaking the wall of the vertical shaft 10. The tunnel 12 becomes a water intake pipe after the tunnel is constructed, and is built by annularly assembling segments 14 one after another at the rear side of the shield driving machine in line with the advancement thereof. Two types of segments 14, RC segments 18 and ductile segments 20, are used. The segments 20 are provided with water intake pores clogged by clogging members. After the tunnel 12 is constructed, workmen enter the shield tunnel 12 with compressed air supplied thereinto, and remove the clogging members of the ductile segments 20.

Abstract: A self-cleaning intake screen assembly for preventing debris, fish, and other wildlife from being transferred from a waterway such as a lake or river, which includes a conical support structure, a screen and a screen sweeping assembly. The conical support structure has a circular base, a cap plate, and a plurality of support studs extending therebetween. The screen extends between the base and the cap plate and is affixed to the support studs. The screen sweeping assembly is rotatably mounted to the cap plate for sweeping debris off of the screen. A flow restrictor is disposed inside the conical support structure for restricting water flow through a portion of the screen in order to reduce differences in water flow rates through different portions of the screen.

Abstract: A method and apparatus for providing water from a lake, pond, or other body of water, relatively silt and sediment free. A water inlet is positioned off the bottom of the body of water and is adjustably supported from the bottom of the body of water. The inlet is maintained above the silt and sediment layer at the bottom of the body of water and below the surface layer of the body of water.

Abstract: A portable water conveyance device for diverting the flow of water and particularly, a stream, includes a collapsible tube for receiving the water and conveying the water downstream to a discharge site. An inlet frame is coupled to the inlet end of the tube to hold the end of the tube open and direct the water into the tube. A pair of pivotally mounted wing walls are attached to the sides of the walls to direct the water into the tube. In embodiments, an outlet frame is coupled to the discharge end of the tube. The outlet frame is mounted on a support structure to adjust the height of the outlet frame with respect to the ground and water level at the discharge end of the tube. A ledge is attached to the lower end of the outlet frame and extends outwardly therefrom in the downstream direction. The shelf extends a distance to inhibit the upstream migration of marine animals that may climb up the support structure. The height of the outlet frame also can be adjusted to control the migration of marine life.

Abstract: A conical intake screen which is self-cleaned by using four elongate brushes which are slowly driven over its surface by a submersible, programmable electric motor. The invention is preferably placed in the waterway with the axis of the conical screen oriented in the vertical direction. As the rearwardly angled brushes move over the screen, the brush angle and gravity tend to force the debris downward until it falls from the edge of the device. Further, a cleaning brush is placed within the surface of the conical screen with its bristles extending slightly above the surface of the screen. In this manner each screen sweeper engages the brush cleaner once each rotation, which action tends to dislodge debris from the bristles of the sweeper brushes. The programmable motor will typically make three counterclockwise revolutions, one clockwise revolution, and then stop for a selectable interval of from 15 minutes to 3 hours, although continuous action is also an option.

Abstract: A method for controlling zebra mussels and other bivalves using UV light at a wavelength of 254 nm. One or more low pressure UV lamps provide an intensity of UV light in the range of about 13,400 .mu.W/cm.sup.2 to about 22,300 .mu.W/cm.sup.2 in the water wherein the bivalves may be located. The one or more low pressure UV amps provide a dose of UV light in the range of about 0.08 W.sec/cm.sup.2 to about 2.6 W.sec/cm.sup.2 in the water wherein the bivalves may be located. The dose is provided for a period of time in the range from about 4.5 seconds to about 116 seconds.

Abstract: A biosolids tracking system monitors the quantity and quality of biosolids deposited on a plot of land. Global positioning system technology is used to determine the land coordinates of the boundary of the plot of land for accurate area calculation in order to determine the loading per unit area of biosolids including metals deposited on the plot. The system includes the ability to display superposed topographic and digitized photographic imagery of the plot with textual annotation.

Abstract: The present invention comprises apparatus designed to repel, but not injure, warm-blooded aquatic life from a specific aquatic region in an energy-efficient manner. A potential gradient is turned on and maintained between sets of immersed electrodes in response to the detection of the presence of warm-blooded animals in the "watched" volume at the surface and above and below the surface of an aquatic region. The electroshock is applied to the animal through the water by use of an electrical field generated from an array of electrodes placed in the water. The size, shape, and intensity of the electrical field are independently controlled by use of design criteria which allow the operator to determine the degree of electrical shock to be administered to a specific animal species by controlling the parameters of electrical energy induced into the animal through the water.

Abstract: A variety of electrified fish barriers are suitable for diverting fish from protected structures, e.g. pump intakes. Most take the form of linear curtain arrays (i.e. arrays of fixedly spaced-apart vertical elements). Many are characterized by the use of three or more pulsed driving signals of different voltages. This results in an electrical field pattern that extends broadside of the array, permitting fish an opportunity to turn and swim away before reaching a dangerous field strength. One barrier advantageously integrates the electrodes with a physical control structure that can be used to equalize the through-barrier water flow along its length. Others employ sets of electrodes that are driven in staggered, time-multiplexed fashion so as to reduce peak power requirements. Barriers used to screen pump intakes on the sides of flowing waterways are desirably sized and placed so that the velocity of water flow through the barrier is one-half, or less, of the waterway bypass flow adjacent the barrier.

Abstract: An anti-fouling apparatus and method for retarding the formation of marine plants and animals on marine surfaces submerged in water is disclosed. Telescopically extendable support arm members in the form of pneumatic struts are pivotally mounted on a mounting bracket for selective movement between a first raised position, at which the distal end is raised out of the water, and a second lowered position, at which the distal end is submerged in the water. A selectively energizable water propulsion means, which includes an electrically powered motor and a propeller, is operatively mounted on the support arm member adjacent to the distal end so as to be submerged in the water when the support arm is in the second lowered position.

Abstract: A protective and aesthetics-enhancing cover for disposition over the open end of a drain pipe projecting outwardly from a building structure. The protective cover comprises a convexo-concave disk which has an outer surface convex away from the building structure and an inner surface concave toward the building structure. The convexo-concave disk is sized so as to effectively hide the drain pipe from view. A tubular mounting flange projects from the disk on the concave surface thereof for coupling to the drain pipe in a telescopic arrangement to thereby hold the cover on the end of the drain pipe. An opening is formed in the disk to allow water to drain from the drain pipe and through the opening.

Abstract: The invention provides an antifouling structure that excels in antifouling performance and durability, dispenses with maintenance work, poses no toxicity problem, and is easily handled. The antifouling structure is in a flexible thin sheet, and comprises a copper alloy and an insulating material layer. The copper alloy has a Be content of 0.2 to 2.8% by weight. The insulating layer material, for instance, is made of at least one of methyl methacrylate-modified natural rubber, nitrile rubber and chlorinated rubber. This rubber is dissolved in a suitable solvent for primer or other treatment, coated on the required surface area of the copper alloy layer, and dried to obtain an insulating material layer having a given thickness.

Abstract: A fish diversion apparatus uses a plane screen to divert fish for variety of types of water intakes in order to protect fish from injury and death. The apparatus permits selection of a relatively small screen angle, for example ten degrees, to minimize fish injury. The apparatus permits selection of a high water velocity, for example ten feet per second, to maximize power generation efficiency. The apparatus is especially suitable retrofit to existing water intakes. The apparatus is modular to allow use plural modules in parallel to adjust for water flow conditions. The apparatus has a floor, two opposite side walls, and a roof which define a water flow passage and a plane screen within the passage. The screen is oriented to divert fish into a fish bypass which carries fish to a safe discharge location. The dimensions of the floor, walls, and roof are selected to define the dimensions of the passage and to permit selection of the screen angle.

Abstract: A method and material for the manufacturing or retrofitting of fluid transport systems. The material chosen for the lining, or the pipe itself, will be selected based on physical properties such as a high impact strength and a low coefficient of friction. The low coefficient of friction will be essential to prevent the initial adhesion of foreign substances to the inner surface of pipes. In particular, an improved pipe composite will be useful in the lining or construction of water intake pipes where there is a well-recognized problem of the buildup of foreign substances including algae and other marine microorganisms. Therefore, by preventing buildup, the present invention will provide a more economical and efficient method to maintain the overall piping system.

Abstract: An apparatus for dispersing chemicals into an underwater pipe comprising first and second chemical feed pipes, the feed pipes being mounted to an intake pipe forming part of the underwater pipe, the first feed pipe extending along the length of the intake pipe and being connected to the second feed pipe, the second feed pipe being mounted to the intake pipe at that portion of the intake pipe adjacent an intake pipe opening, the second feed pipe including a plurality of inwardly extending releasing valves for dispensing chemicals into the intake pipe, the chemicals being delivered to the second feed pipe through the first feed pipe. A cone-shaped device is also disclosed for inserting the first chemical feed pipe into the intake pipe, the cone-shaped device having first and second cone elements coaxially spaced apart to form an air pocket therebetween.

Abstract: A method and apparatus for controlling zebra mussels in the inlet cell of a utility power plant by isolating a batch of water in the cell from the water supply of a lake or river and the equipment plant by shutting an inlet gate and shutting outlet valves from said cell. The batch of isolated water is thereafter heated to a lethal temperature which is maintained for a sufficient period of time to ensure 100 percent mortality to the zebra mussels within the cell. The water may be maintained in a static condition and heated by a heat exchanger disposed within the cell. Alternatively the water may be fed to a heat exchanger, heated outside the cell, and returned to the cell. The water is heated to a range of approximately 95.degree. F. to 100.degree. F. and held at the heated temperature within the cell for approximately 30 minutes.

Abstract: The system consists in producing an underwater foundation (1) in the appropriate place, close to the dam (2), in the vertical line of said foundation (1) producing a floating platform (4), with buoyancy that can be regulated, and on this platform (4) proceeding with the manufacture of the tower (6-7), by means of a continuous concreting process, up to the moment when said tower is capable of floating alone, given its hollow nature, at which moment the floating platform (4) can be removed and from which time the tower becomes increasingly submerged in step with the increase in the length of its shaft (7), by means of supplying water (8) to its inside, until the said tower is totally finished, at which moment it is positioned by means of a greater supply of water which may be removed if it is necessary to correct errors in positioning, and after said definitive positioning the tower is also definitively ballasted or rendered stationary, the control and command elements for the gates or valves for the various in

Abstract: A method whereby a concentrated aqueous solution of chlorine dioxide is injected into offshore water intake facilities for preventing zebra mussel infestation therein is described. The chlorine dioxide is generated from generators positioned on a portable vessel above the water intake facilities. The treatment using concentrated chlorine dioxide solution permits periodic treatment so that the same portable generators may be used to treat a number of water intake facilities.

Abstract: A method and apparatus for eliminating zebra mussel colonizations from fresh water intake pipes for facilities, such as power plants and water treatment plants, are disclosed. One or more small diameter alternate intake pipes are disposed within a main intake pipe, and the pipes are connected by means of individually controllable valves to a pump for supplying water to the facility. Zebra mussel build up along the interior walls of any of the pipes is eliminated by shutting off flow in any mussel infested pipes with the valves, which causes starvation of the mussels due to suffocation. When water flow is resumed, the dead mussels are easily washed out of the pipes. The alternate intake pipes can be made of inexpensive flexible material, such as rubber, since they are not exposed to the environment external to the main intake pipe. In addition, a non-stick coating, such as silicone, can be disposed on the interior walls of the alternate pipes to further prevent mussel build up.

Abstract: A cover for eliminating marine life from the intake of a water intake positioned beneath the surface of a body of water. The cover is placeable over a water intake and is provided with a plurality of apertures formed therethrough which permit water to flow into the water intake. An electrical wire is embedded in a spiral or serpentine fashion within the cover. An insulated cable connects to the embedded wire and provides a radio frequency signal from an external source of power. The wire radiates radio frequency energy over the surface of the cover so that sea mussels and other marine life which have accumulated on the cover are repelled or killed. In a different configuration, electrical heating elements are connected to the wire and generate sufficient heat to drive off or kill the marine life. In a further embodiment, a sonic generator is attached to the cover and generates sonic waves which achieve the same result.

Abstract: Water is supplied from a preselected depth in a body of water by an intake held at the preselected depth by a stem connected to a float which rides near the surface of the water. The stem is weighted to maintain a desired orientation of the device in the body of water. A guide is provided in the body of water to maintain the horizontal position of the intake means.

Abstract: The present invention provides an apparatus to prevent the entrance of aquatic species into the intake watercourse having a U-shaped cross section with a narrow bottom and a wide surface, in which oppositely facing electrodes are installed vertically along the side walls on both sides of the intake watercourse, and the distance between the upper ends of the electrodes is made greater than the distance between the lower ends of the electrodes, and a voltage is impressed between the both electrodes. Since the electric barrier intensity is smallest at the surface of water and becomes greater as it goes toward the bottom of water, the river fish moving around the bottom of water make a U-turn when they reach the strong electric barrier, or alternatively, after reaching the strong electric barrier, they move upward to where the electric barrier is weaker and then make a U-turn, thereby the entrance of aquatic species into the intake watercourse can be prevented.

Abstract: Apparatus and method for providing essentially silt free water for the irrigation of turf grass areas and in particular for the irrigation of putting greens on golf courses. Flotation is provided for supporting the end of the inlet hose in a water body at a position therein below the surface of the water and above the silt located in the water body so that silt will not be ingested into the inlet hose and ultimately into the sump. The irrigation pump has its inlet end disposed in the sump so that silt deposited therein will not be carried into the irrigation system or plug the pump inlet. Coupling means is provided for joining the flexible inlet hose to the water supply pipe leading to the sump so that the flotation apparatus can be connected to existing water supply pipes or connected in new installations.

Abstract: A catch flow restrictor plate to control surcharging of water in a sewer system. The restrictor plate is to be placed in a catch basin and consists of a tray, which comprises an upper edge, downwardly sloping walls descending from the upper edge, the walls merging into a central portion. The central portion has a plurality of concentric calibration lines formed therein enabling to form an opening of a selected size by removing part of the central portion along a selected calibration line. A plurality of vertical fins are provided that radially extend from the central portion to the upper edge. The upper edge is arranged to hold the tray within a frame of the catch basin.

Abstract: The invention relates to an apparatus for keeping a rain water well unfrozen. The apparatus comprises a cover (12), walls (13) and an outlet (15), which defines an air space (16) of the well above the outlet and a water space (17) of the well below the outlet. According to the present practice, the whole surface area of the water in a rain water well is in contact with open air, which results in that the well freezes relatively easily under the joint influence of wind and frost. This problem is solved according to the invention in such a way that the apparatus comprises a funnel (1) positioned under the cover (12) of the well and a flow tube (5), the cross section of which is substantially smaller than the diameter of the well and which tube extends from the lower part of the funnel (1) under the water surface of the well.

Abstract: This invention is a device to prevent beavers (Castor fiber or Castor canadensis) from building dams or obstructions in or at the entrance to manmade structures for the flow of water, thus preventing the flow of water through such structures to the detriment of such manmade structures, adjacent or nearby structures and to the detriment of land, trees and agricultural crops upstream of the first said manmade structure. This device may also be utilized to limit the water level, or depth of water, in pools in water caused by beaver dams restricting water flow in water drainage channels. This device is not normally harmful to beavers.

Abstract: A pillow adapted for use as a soil filtration and water drainage device. The pillow includes a plurality of substantially oblong, rounded, noncompressible, noncollapsible, water resistant, non-biodegradable, and nonflammable pellets. The pellets are normally about one-half inch to two inches long. The pellets are enclosed by an outer, flexible membrane permeable to water, but impermeable to soil. Thus, water, but not soil, may pass through the membrane and around the pellets. The pillow is deformable, yet sturdy and readily adapts to the shape of the surrounding soil and other materials. Moreover, the pillow is lightweight and inexpensive.

Abstract: An improved roof drain cover useful in minimizing the changes of comparatively large amounts of water backing up around the drain can be constructed so as to include primary and secondary rims serving as weirs located on a flange which extends around a centrally positioned grate. The primary rim is formed at the periphery of the flange and integrally therewith, while the secondary rim is formed adjacent the junction of the flange and grate and forms a channel with the grate. Notches are provided in these rims so as to permit water flow through them. The dimensioned rims are so that, as such inorganic particles accumulate against them, lighter organic material such as leaves will be carried by draining water over the rims and up against the grate.

Abstract: A plastic shield which is generally rectangular and convex in shape is inserted into a storm drain to provide protection to a storm drain outlet from cleaning tools. The shield is constructed in two sections and is moveably connected to the storm drain to allow workman easy access to the storm drain outlet.

Abstract: A siphon apparatus for hindering beavers from blocking the inlet of a flood control riser in a water reservoir. The siphon apparatus includes a first conduit for being positioned within the riser, the first conduit having a lower end and an upper end; a second conduit for being positioned outside the riser, the second conduit having a lower end and an upper end, the lower end of the second conduit being at a higher vertical plane than the lower end of the first conduit; and a third conduit for joining the upper ends of the first and second conduit and for allowing water to be siphoned from the lower end of the second conduit to the lower end of the first conduit.

Abstract: In a situation where animals, such as beavers, attempt to flood lands by blocking culverts or constructing dams across waterways, a device is used to maintain a constant flow of water through the dam or culvert. An elongated pipe or culvert with a downwardly directed opening distant from the culvert or dam is used. On the end of the pipe closest to the culvert is a gate which prevents animals and debris from passing through but allows for the smaller elongated pipe to communicate with the culvert. The beaver instinctively attempts to dam the gate area rather than dam the underwater opening of the elongated pipe, and thus is unsuccessful in stopping the flow of water.

Abstract: An offshore intake structure for a water cooling system having an intake shaft communicating with a lake or like reservoir comprises a well excavated in the bed of the lake having an opening communicating with the intake shaft. The well is covered by a submarine roof structure having a perforate outer region defining an inlet to the well and an imperforate inner region which extends over the intake shaft opening and radially outwards therefrom so as to define with the well bottom a horizontal flow passage extending inwards to the intake shaft. The construction is such as to permit an adequate intake flow while keeping the intake velocity below the limit at which fish would be entrained.

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: A roof drain for either a sump or a flush installation has a body having a centrally located water collecting section which is capable of being attached to a pipe, a first surface extending around the periphery of the central section, a connecting surface extending upwardly and away from the periphery of the first surface and a second surface extending outwardly around the periphery of the connecting surface. The first and second surfaces are parallel to one another with the second surface serving as the mounting surface for mounting the drain on to a roof. A grate attaches to the body by attaching directly to the second surface for sump functioning, or in conjunction with an insert for flush functioning. For the flush functioning, the insert fits against the connecting surface and the first surface to become located between the grate and the body.

Abstract: An apparatus is disclosed for minimizing the horizontal forces on an offshore arctic structure due to ice movement. The structure includes a base portion, sloped side walls and a smooth, unobstructed top portion. The structure is substantially submerged in a body of water with the top portion at or near the water surface permitting floating ice sheets which strike the side walls to flex slightly upward and advance along and over the structure without substantially destroying the overall integrity of the ice sheet. In this manner, the horizontal forces on the structure resulting from the ice sheet are minimized due to the elimination of a crushing failure mode of the ice sheet commonly associated with conventional offshore arctic structures.