Abstract: An aerated swirling vertical shaft with double volute chambers comprises an upper volute chamber (2) and a first shrinking section (3) beneath the upper volute chamber (2), a venting passage (4) outside the upper volute chamber (2), a vertical shaft section (7) beneath the first shrinking section (3), as well as an aerated lower volute chamber (5) and a second shrinking section (6) communicated with the aerated lower volute chamber (5) between the first shrinking section (3) and the vertical shaft section (7), wherein the upper end of the aerated lower volute chamber (5) is connected with the first shrinking section (3), the lower end of the second shrinking section (6) is connected with the vertical shaft section (7); the upper end of the venting passage (4) is communicated with the atmosphere and the lower end is communicated with the aerated lower volute chamber (5).

Abstract: A sluice-gate wall thimble has a support stem (1, 12) which covers an embedment side of a sluice-gate nut (2) and is fixable to a wall anchor (5, 11). The sluice-gate nut is inside threaded and fixable to an embedment side (16) of a predetermined sluice-gate wall (7) with an axis of the sluice-gate nut being in line concentrically with an axis of a wall-bolt aperture (8) on the predetermined sluice-gate wall. A plurality of the support stems on a plurality of the sluice-gate nuts in line with a plurality of the wall-bolt apertures and fixed to at least one wall anchor are employed first to prevent encroachment of fluid concrete (3) or other foundation material onto inside-diameter threading (4) of the plurality of sluice-gate nuts during construction of a predetermined sluice gate.

Abstract: The invention employs the principle that the force of buoyancy received by a body immersed in a liquid is determined by the density of the liquid and the extent or depth of immersion in the liquid and is unrelated to the displacement of the liquid by the body, thereby reducing the total size and weight of devices providing buoyant support. Buoyant support is provided to bodies in a manner that permits devices to be made for the measurement of both small and large weights and for support of the human body for the purpose of relieving the pressure induced trauma and skin abrasion otherwise incurred by bedridden patients, such as burn victims and those requiring extended or continual bed rest. A tub-like cavity that closely conforms in size and shape to the part of the body to be immersed is made to contain and float a human body on a volume of liquid that equals only a fraction of the body's weight.

Abstract: A floating weir assembly for controlling the discharge of fluid from a fluid reservoir. The weir assembly includes a buoyant body preferably comprising a sidewall surrounding a central bottom opening. A weir is provided on the inside surface of the sidewall, and a gauge is provided on the opposite side of the sidewall's inside surface. The sidewall may provide a ballast chamber for holding ballast, such as sand. By adjusting the amount of the ballast, the depth to which the body is submerged can be varied. By distributing the sand circumferentially, the body can be leveled in the fluid to ensure accuracy of the weir. Because the sidewall is partially submerged, undesirable surface matter, such as oil and debris, is prevented from entering the weir. While there are many applications for this floating weir assembly, a preferred application is in the field of sewage treatment systems.

Abstract: An adjustable weir for use in a liquid distribution system utilizes a weir plate having a weir opening whose height can be adjusted vertically. The weir plate is mounted to the end of a fluid distribution outlet in a manner which will maintain its proper orientation while allowing its vertical position with respect to the outlet opening to be varied.

Abstract: A hydrologic discharge control assembly and method is disclosed for automatically withdrawing bottom water from a body of water comprising a housing for forming a reservoir to receive bottom water for automatic gravitational discharge relative to the height of the top surface of the body of water, the reservoir having a discharge overflow edge portion adapted for operational connection to the discharge drain passageway of the body of water and being disposed for overflow discharge of water within the reservoir in excess of a predetermined level, and an inlet connector fluidly connecting the housing to the bottom water portion of the body of water and being dimensioned and configured relative to the housing for conduction of bottom water into the reservoir relative to the height of the top surface of the body of water.

Abstract: The salinity intrusion of ocean tidewater into a communicating fresh water river is prevented by laterally restricting the out-flow cross-section of the river with a series of flotation weirs and control weirs so that the surface level of the out-flow cross-section is higher than the surface level of the adjacent tidal salt water. The weirs are located so as to not obstruct the ship channel of the river.