Aspects of the present disclosure involve hydraulic systems and methods for altering a flow of a body of water, such as a river, channel, and/or other flowing or uncontained bodies of water. In one aspect, a hydraulic system provides a velocity barrier for the impedance of aquatic organism migration. More particularly, the velocity barrier may be adapted based on the swimming capabilities of one or more aquatic organisms to impede migration. The aquatic organism may be one or more species of fish, such as species sea lamprey (Petromyzon marinus). The example implementations shown and described herein reference the restriction of the sea lamprey. However, it will be appreciated that other aquatic organisms could be restricted by the presently disclosed technology, for example, with different hydraulic targets depending on swimming capabilities.

The invention relates to a covering device for liquid tanks, in particular swimming pools, comprising a buoyant covering element, the covering element comprising a continuous covering layer and a fluid chamber connected to the covering layer, a pumping being provided, which is designed to convey a liquid, in particular water, and/or a gas, in particular air, into the fluid chamber. The invention also relates to an assembly of a covering device according to the invention together with a liquid tank.

A system for learning to float including an aquatic learning station deployable in a volume of water. The learning station can include a horizontal member having an upper and a lower surface, wherein the horizontal member is supported in the volume of water with the upper surface located within four inches of a surface of the volume of water. The system can include a tether assembly coupled to the aquatic learning station. The tether assembly can include a tether portion releasably coupled to and extending away from the aquatic learning station and a belt portion connected to the tether portion and wearable by a person learning to float.

A combination trampoline and pole device that may be used for exercise, adult entertainment, and/or recreational purposes. A retrofit trampoline and pole device that may be use with a water structure for exercise, adult entertainment, and/or recreational purposes. An entertainment system that may comprise a trampoline and a pole that may be used for exercise, adult entertainment, and/or recreational purposes.

A universal cover for a water mat is provided. The universal cover has a top cover portion and a bottom cover portion that can be secured together with zippers. The bottom cover portion has a plurality of parallel buoyant bars and the top cover portion has metal structures to securely hold magnetic accessories.

A swimming training aid is provided and comprises an elongate buoyant body. The body has a generally circular section along substantially the entirety of its length, and the diameter of the body is non-constant along at least the majority of its length.

A swimming exercise device, comprising a restraint including an opening and a contact portion, the restraint configured to receive a head of a user through the opening and to restrain the user, via contact between shoulders of the user and the contact portion, such that the user is held substantially stationary during forward motion of the user against the restraint and an abutment structure configured to contact a pool surface and transmit forces associated with the forward motion of the user against the restraint to the pool surface.

This invention is a simple method to play a one-on-one underwater goal-scoring sport together with the pertinent field of play, the projectile and the goal apparatus. While underwater, one offensive player throws the projectile toward the underwater goal apparatus defended by a defending player who tries to tag out the offensive player before they can throw, or who tries to prevent the projectile from touching the goal area. Variations to the projectile and the goal apparatus are also described as options for use in the sport.

The invention provides for an apparatus for the throwing of bags comprising a first game piece and a second game piece, each including a play board and a boat board underneath the play board; a target hole on a rear end of each play board; the front of each play board is attached to the front of each boat board at an angle relative to the boat boards; the first game piece having a bow board at a rear end of the game piece; and the second game piece having a bow board on the front end of the game piece. The invention also provides for methods of playing bag toss in a body of water with the apparatus.

Described is a utility training flotation vest designed for physical and leisure activities such as strength training, cardiovascular training, water activities, posture assistance, body building competitions and hiking. This invention is comprised of one or more connector strap to assemble and/or disassemble, sling band, chambers, storage compartment, loop, fastener, working strap, compressed lining, mesh and optional attachments, preferably to limb straps. The sling band comprising of at least one adjustable working strap to adjust the customized strength and/or length wherein can expand and return to the original length. The chambers and compartment are designed to comprise the sling bag and/or weighted objects.