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 sized 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 sized 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.

Single-door flap gates and double-door flap gates are disclosed. A first flap gate includes a first door coupled with a first hinge, a second door coupled with a second hinge, wherein the first door and the second door together form a continuous concave surface, wherein the first hinge and the second hinge couple with a wall, and wherein, when in a closed position, the first door and the second door rest against the wall to cover an opening thereof. The opening may correspond to an end of a pipe that extends away from the first door and the second door. Further, the continuous concave surface may include a radius of curvature configured to be substantially similar to a radius of curvature of the wall, wherein the wall may be interior wall of a cylindrical structure.

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.

An automated water control device comprises a rotatable housing that can be incrementally positioned to control flow of water over an upper or weir edge of the housing. The device is installed at a control point in an impoundment area, such as a settling pond. The housing is selectively rotated to raise and lower the height of the weir edge to a target gate height. Automatic control is provided for operation of the device by a controller communicating with an actuator. A system of the invention includes one or more water control devices and the controller. A method of the invention includes controlling flow of water from an impounded water source by use of the automated water control device. Manual or semi-automated embodiments are also disclosed.

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.

Disclosed is a control system for a water network. The control system includes a plurality of remotely-located monitoring and or monitoring and automatic control stations each including an automation controller for local control and automation, and each in communication via a dual-ring communication topology for system or wide-area control. The dual-ring facilitates redundant peer-to-peer data exchange to provide upstream and downstream water flow and water quality information. Systems described herein may calculate flow differential based on water flow data from each of the monitoring stations, and control flow based on the calculated flow differential.

Methods of containing liquid introduced onto a support surface include forming the support surface with at least two mats, the mats forming a perimeter of the support surface. A plurality of berm members is positioned at least partially around or proximate to the perimeter of the support surface and extends upwardly relative to the mats sufficient to prevent liquid introduced onto the top of the support surface from leaking off of the support surface around the perimeter thereof.

Methods of containing liquid introduced onto a support surface include forming the support surface with at least two mats, the mats forming a perimeter of the support surface. A plurality of berm members is positioned at least partially around or proximate to the perimeter of the support surface and extends upwardly relative to the mats sufficient to prevent liquid introduced onto the top of the support surface from leaking off of the support surface around the perimeter thereof.