A sea water intake system comprising a main sea water intake pipe, one end of the sea water intake pipe being provided with a centrifugal chamber, the chamber having at least one tangential inlet for entry of sea water to cause rotation of the sea water in the chamber. The other end of the intake pipe terminates in a sump, the sump having a water level lower than that of sea level and having a pump to transport sea water from the sump through a delivery pipe to a treatment plant. A central region of the centrifugal chamber is in fluid communication with a substantially vertical airlift pipe having an air inlet at, or close, to the chamber and a water exit remote from the chamber.

Disclosed herein is a device for directing fish toward a preferred path in a water passageway. The device includes a base and a plurality of spaced bars coupled to the base and cantilevered from the base. The plurality of spaced bars are electrified in anode cathode pairs. The plurality of spaced bars can extend from the base to form a frustoconical shape such that the spaced bars direct fish toward a hydraulic turbine blade hub and away from a hydraulic turbine blade tip. Alternatively, the plurality of spaced bars can extend from the base to form a linear array.

A fish screen is presented having a porous surface made of two or more corrugations (e.g., elongated convex shapes) having an at least partially porous surface. The incorporation of a porous area on the corrugations allows increasing the total porous surface area compared to an underlying diversion area. The porous area is a magnification of an underlying diversion area, which reduces the fluid pressure (e.g., impingement forces) acting on the porous area of the screen. The valley between each pair of corrugations is solid, not porous. The solid valley(s) provide two important functions; they provide multiple small solid surface flow channels over the screen surface. These solid channels protect small or weak swimming aquatic organisms from impingement on the screen. That is, once organisms reach the solid channel, they may move along the solid channel free of impingement until they reach the edge of the screen.

A precast dam structure includes at least two precast segments coupled together via linkages and a flow path structure. The flow path structure defines a flow path having an intake port and a draft port and is associated with at least one of the at least two precast segments. The flow path structure is configured to provide a change in flow direction, either internally or externally, from the at least one of the at least two precast segments.

An energy generating unit for generating electric energy from water power is provided. At least one turbine system is installed in a conventional standard container in a channel which rungs in the standard container. The channel is arranged in the flow direction of a surrounding body of water. A fishway is provided on or in the standard container.

A runner for a hydraulic turbine configured to reduce fish mortality. The runner includes a hub and a plurality of blades extending from the hub. Each blade includes a root connected to the hub and a tip opposite the root. Each blade further includes a leading edge opposite a trailing edge, and a ratio of a thickness of the leading edge to a diameter of the runner can range from about 0.06 to about 0.35. Further, each blade has a leading edge that is curved relative to a radial axis of the runner.

The present disclosure discloses a buffering fishway suitable for emergent flood discharge with reduction in damage and a buffering method thereof. The buffering fishway includes a fishway body, wherein a migration passage is arranged inside the fishway body, one end of which is rotationally connected with a fixing base, and the other end of which is rotationally connected with a counterweighting floating dock, and a plurality of buffering plates capable of swinging are hinged inside the migration passage, furthermore, the present disclosure also provides a buffering method corresponding to it. The present disclosure effectively reduces the potential energy of the flood and weakens the impact force on the fish. Therefore, the gate dam having this design effectively avoids the fish in the fishway from being fiercely impacted by the flood and easily resulting in damage during discharging flood, having a high protective effect on the fish.

Present invention comprises a separate bypass channel that is installed on one side of the dam connecting upstream and downstream; water supply for fish ladder which is installed upstream, spillway wall disposed downstream of dam and having groove, a first fish ladder facility which connects said water supply and the spillway wall and has a predetermined number of the partition wall with a passage opening respectively, which are structured in a stepwise manner The first even and facility are installed on the upstream side inlet of the bypass channel is configured; and a second fish ladder facility which comprises inclined channel installed for discharging water to the side of the dam, sloping and comb wall contiguous installed to alternately at predetermined intervals on both sides of the main wall of the inclined channel, and movement passage in the shape of pipe shape that connects upstream and downstream on the inner bottom of the dam, which is provided in the middle of said bypass channel.

A salmon migration lift device including a lift cable loop between two bullwheel terminals and a plurality of gondola buckets suspended from the lift cable loop which are filled with water and fish at a loading station on a downstream side of a waterway obstacle and which are emptied at an unloading station into a fish exit chute connected to the upstream side of the waterway obstacle.

An improved sensor fish with robust design and enhanced measurement capabilities. This sensor fish contains sensors for acceleration, rotation, magnetic field intensity, pressure, and temperature. A low-power microcontroller collects data from the sensors and stores up to 5 minutes of data on a non-volatile flash memory. A rechargeable battery supplies power to the sensor fish. A recovery system helps locating sensor fish. The package, when ready for use is nearly neutrally buoyant and thus mimics the behavior of an actual fish.