A dam according to the present disclosure includes a main dam including a first reservoir, and at least one first discharge part configured to discharge water stored in the first reservoir, an auxiliary dam spaced apart from the main dam at a predetermined interval and including a second reservoir configured to store the water discharged from the main dam, and at least one second discharge part configured to discharge the water stored in the second reservoir, and an underground water path being provided separately at a lower side of a bottom surface of the river or stream under a lower side of the second reservoir, and including a third discharge part.

A dynamic fluid flow control structure is provided that allows precise control over fluid flow using a series of two or more orifices, at least one of which may be reconfigured to change its flow characteristics. A flood control system and a flood control process are provided that emulate a preset discharge profile over time. Some versions of the structure, process, and system can be used to provide controlled storm discharge patterns in a developed area that emulate the natural pre-development discharge patterns.

A water flow control device is provided that opens to allow water to leave a basin and pour into another pool of water. The water flow control device closes when the level in the pool of water is such that an influx of water could be returned to the basin. The water flow control device has a buoyancy apparatus that opens and closes the water flow control device based upon the level in the pool of water. The water flow control device also has a conveyance channel apparatus that directs water from the basin through the water flow control device in the event the buoyancy apparatus provides an opening to do so.

A flood barrier for protecting the environment having a venturi type effect pumping means not requiring external power, the flood barrier comprising a wall and a pump for drawing water across the barrier from a first side to a second side. The wall configured to provide a barrier preventing movement of water from the first, drain, side to the second, tributary, side, of that wall. The barrier further comprising a pipe traversing the wall for transferring water between the two sides of the wall the pipe being terminated in the first side of the wall at a venturi effect pump, the pump being feedable with water from the drain through a conduit inlet so as to create suction in the pipe for drawing water through the pipe from the second side of the wall to drain water from the second to the first side of the wall.

An air infiltration system for a hydroelectric plant includes a spillway gate and a linearized cone valve coupled to the spillway gate, the linearized cone valve having a pivotable plate assembly. The spillway gate may be a tainter or Stoney gate and the pivotable plate assembly may have a deflection plate. A method of infiltrating air in water released from an impoundment may include: lifting a spillway gate from a resting position proximate a bottom of a spillway; and pivoting a deflection plate coupled to the gate proximate the bottom of the spillway; wherein water flows through an opening disposed between the deflection plate and the gate and is sprayed into an atmosphere to be oxygenated.

An air infiltration system for a hydroelectric plant includes a spillway gate and a linearized cone valve coupled to the spillway gate, the linearized cone valve having a pivotable plate assembly. The spillway gate may be a tainter or Stoney gate and the pivotable plate assembly may have a deflection plate. A method of infiltrating air in water released from an impoundment may include: lifting a spillway gate from a resting position proximate a bottom of a spillway; and pivoting a deflection plate coupled to the gate proximate the bottom of the spillway; wherein water flows through an opening disposed between the deflection plate and the gate and is sprayed into an atmosphere to be oxygenated.

A gate valve for use in controlling the level of a dam has a first plate with an aperture on an upstream face of the dam and a movable plate on the upstream side of the fixed plate, with apertures sixed and dimensioned to operate as a scissors when the movable plate is urged in a linear motion parallel to fixed plate. One or more edges of the apertures in the plates are provided with a sharp edge or a serrate edge oriented to sever obstructing object present in the apertures when the valve is transitioning from an open position to a closed position.

A gate valve for use in controlling the level of a dam has a first plate with an aperture on an upstream face of the dam and a movable plate on the upstream side of the fixed plate, with apertures sixed and dimensioned to operate as a scissors when the movable plate is urged in a linear motion parallel to fixed plate. One or more edges of the apertures in the plates are provided with a sharp edge or a serrate edge oriented to sever obstructing object present in the apertures when the valve is transitioning from an open position to a closed position.

A bollard wall gate system including a lockable access door enclosing the gate which is easy-to-operate and resistant to tampering. The bollard wall gate system generally includes one or more bollard panels which form a continuous bollard wall. Each of the bollard panels includes a passageway which may be selectively opened or closed by use of a gate. The gate includes a plurality of gate members which may be raised to open the gate or lowered to close the gate. The bollard panels include an enclosure through which the gate extends. A locking device may be utilized to selectively lock the gate in its opened or closed position, with the locking device being connected to the gate within the enclosure so as to prevent tampering or unauthorized access.

A bollard wall gate system including a lockable access door enclosing the gate which is easy-to-operate and resistant to tampering. The bollard wall gate system generally includes one or more bollard panels which form a continuous bollard wall. Each of the bollard panels includes a passageway which may be selectively opened or closed by use of a gate. The gate includes a plurality of gate members which may be raised to open the gate or lowered to close the gate. The bollard panels include an enclosure through which the gate extends. A locking device may be utilized to selectively lock the gate in its opened or closed position, with the locking device being connected to the gate within the enclosure so as to prevent tampering or unauthorized access.