An integrated system comprising a barrier, such as a weir with movable gates, controllably blocks water flow in a natural or concrete lined channel. Without substantially impeding flow in normal conditions, the barrier is configured to back up flood waters to spill into an upstream prepared detention basin. Water is thus kept from downstream areas until subsequently drained through a controlled spill. Multiple units installed in a watershed can store significant amounts of flood water, e.g., during a hurricane, protecting life and property downstream. The electromechanically-operated gates can be operated locally or from a remote control center. Gauges and sensors positioned near the weir and/or throughout the watershed can provide data used to control one or more barriers in the watershed, and the data may be used to train a machine learning model to control the system.

An integrated system comprising a barrier, such as a weir with movable gates, controllably blocks water flow in a natural or concrete lined channel. Without substantially impeding flow in normal conditions, the barrier is configured to back up flood waters to spill into an upstream prepared detention basin. Water is thus kept from downstream areas until subsequently drained through a controlled spill. Multiple units installed in a watershed can store significant amounts of flood water, e.g., during a hurricane, protecting life and property downstream. The electromechanically-operated gates can be operated locally or from a remote control center. Gauges and sensors positioned near the weir and/or throughout the watershed can provide data used to control one or more barriers in the watershed, and the data may be used to train a machine learning model to control the system.

The present disclosure relates to a method for constructing a penstock. A path of the penstock to be dug along a central axis of a hydro-electric site within a rock mass is planned. A lower shaft is excavated, the lower shaft intersecting the path of the penstock. A starting station extending from the lower shaft and from a bottom of the path of the penstock is excavated. The penstock is excavated. An arrival station is excavated and is overhanging above a top of the penstock. An expansion chamber broadening a width of the penstock and broadening a width of the lower shaft near the bottom of the path of the penstock is excavated. A hydro-electric site comprising the penstock is also disclosed.

The present disclosure relates to a method for constructing a penstock. A path of the penstock to be dug along a central axis of a hydro-electric site within a rock mass is planned. A lower shaft is excavated, the lower shaft intersecting the path of the penstock. A starting station extending from the lower shaft and from a bottom of the path of the penstock is excavated. The penstock is excavated. An arrival station is excavated and is overhanging above a top of the penstock. An expansion chamber broadening a width of the penstock and broadening a width of the lower shaft near the bottom of the path of the penstock is excavated. A hydro-electric site comprising the penstock is also disclosed.

An axis positioning mechanism serving as a rotation bearing of a flap gate includes a housing disposed at the bottom of an opening, a first rotating plate rotationally supported by the housing via a first shaft, a second rotating plate rotationally supported by the housing via a second shaft having a different axis from the first shaft, and a synchronizing rod rotationally connected to the rotating plates so as to synchronize the rotations of the rotating plates. The axis positioning mechanism further includes connecting members rotationally connecting a door base and the rotating plates with different axes. The door is laid flat with a pivot at a higher position than the axes.

The invention relates to a separation device for removing objects from a water flow, comprising a separation screen and a channel which forms an inlet and an outlet for the separation screen, wherein, during operation, a head water having a head water level can be provided in the inlet upstream of the separation screen and a tail water having a tail water level can be provided in the outlet downstream of the separation screen, wherein the outlet comprises an outlet cross-section for the water flow. The separation device is characterised by a damming body, which can be adjusted via an actuator, for immersion into the outlet, said damming body being able to be adjusted at least between a first position and a second position, wherein the outlet cross-section is smaller in the first position and the outlet cross-section is larger in the second position, and comprising a control device, wherein the control device includes a first operating mode, in which the flow rate in the area of the separation screen is increased by bringing the damming body from the first position to the second position, wherein the control device includes a second operating mode, in which the flow rate in the area of the separation screen is changed by bringing the damming body from the second position to a third position, wherein the outlet cross-section in the third position is smaller or larger than in the second position, and wherein the control device is configured to automatically activate the first and/or the second operating mode. The invention also relates to a method for operating such a separation device.

An automatic water control system for open ditch drainage includes a drainage control apparatus that is designed to be disposed in a drainage ditch and to control the water level in the drainage ditch, as well as the water table level in the field.

An opening/closing device according to the present invention includes a gate, a fall prevention unit, a support release unit, a first float, a floating prevention unit, a second float, and a floating prevention release unit. The gate receives a flow of fluid, and is able to fall down toward a downstream direction of the flow. The fall prevention unit supports the gate, thereby preventing the gate from falling down. The support release unit releases the support for the gate by the fall prevention unit. The first float is arranged on an upstream side of the gate, is arranged on one of the left side and the right side of the gate viewed from upstream, and is less in the specific gravity than the fluid. The floating prevention unit prevents the first float from floating.

A method for controlling the gate based on the habitat requirement for fish overwintering in rivers. According to the characteristics of biological habitat of the river and the habitat demand of fishes during overwintering, the method specifically comprises the steps of: firstly, determining candidate fishes for ecological flow calculation though fish resources investigating and historical data, and then screening out the target fish by adopting hierarchical analysis method; Secondly, establishing a quantitative response relationship curve between target fish physiological adaptions and water temperature, obtaining ecological water level which ensures the target fish overwintering safely according to the vertical temperature distribution, and establishing the relation between water depth and discharge using hydrodynamic model; finally, setting up a gate control system including a radar water level meter in the overwintering areas and an ecological water level management system in a gate control room.

According to one embodiment, a flood vent panel includes a plurality of insulation pieces positioned together, and a panel frame surrounding the plurality of insulation pieces. The flood vent panel is configured to be coupled to a frame positionable into an opening in a structure, so as to at least partially block a fluid passageway through the opening in the structure. One or more of the plurality of insulation pieces are configured to uncouple from the flood vent panel when at least a predetermined amount of pressure is applied to a portion of the flood vent panel by one or more of a fluid or an object carried by the fluid, so as to reduce an amount of blockage of the fluid passageway provided by the flood vent panel.