A folding hanger includes a hook extending from an upper end of a hinge pin for suspending the pin. First and second hanger arms each have proximal and distal ends and define a support surface therebetween. Each proximal end has a stop. A knuckle having a hole extends from each proximal end. The pin passes through the holes along an axis, coupling the arms and hook whereby the arms are movable between extended and folded configurations. The stops abut when the arms are extended, and are separated when folded. The hanger has a center of gravity when the arms are extended and suspended by the hook such that the axis is angled relative to vertical in a first direction and the stops bias abutting. The arms each have a center of gravity such that angular movement of the axis past an unstable equilibrium causes the arms to move toward folded.

An upper level of a multi-level building is guarded from flooding by water present in one of the levels of the building where the upper level is reached from the lower level (or vice versa) by connecting stairs. A flight of stairs bridging the levels is buoyant and pivotally connected to the building at one end of the flight adjacent one of the levels such that on occasion of water rising originating in one of the levels, the flight rotates upward on the axis of the pivot to block water from entering the upper level.

The present disclosure relates to a mining site comprising an extraction shaft passing through an ore body. Also included in the mining site are a lower shaft intersecting a path of the extraction shaft, a starting station extending from the lower shaft and from a bottom of the path of the extraction shaft, an arrival station overhanging above a top of the extraction shaft, and a upper shaft extending from the arrival station. In a particular aspect, the extraction shaft can be dug at a shallow angle between 10 and 45 degrees from horizontal. A shallow angle mining method for constructing the mining site is also provided. The present disclosure additionally introduces a hydro-electric site having a penstock dug at a shallow angle, and a method of digging a penstock.

The present disclosure relates to a mining site comprising an extraction shaft passing through an ore body. Also included in the mining site are a lower shaft intersecting a path of the extraction shaft, a starting station extending from the lower shaft and from a bottom of the path of the extraction shaft, an arrival station overhanging above a top of the extraction shaft, and a upper shaft extending from the arrival station. In a particular aspect, the extraction shaft can be dug at a shallow angle between 10 and 45 degrees from horizontal. A shallow angle mining method for constructing the mining site is also provided. The present disclosure additionally introduces a hydro-electric site having a penstock dug at a shallow angle, and a method of digging a penstock.

A movable tsunami buffer dam has a unit configured such that a plurality of separate units, each of which having a shape in which a frame made of a light material is sandwiched by a pair of plates made of a light material, is stacked with said plates disposed in a pile; and a locking member for locking said unit to a ground surface such that said unit can rise up from said ground surface and collapse onto said ground surface. The separate units has a structure in which water from a tsunami can advance into a space formed between said plates by said frame. A required thickness is ensured due to said unit being configured such that said separate units are stacked, and the manufacturing cost is reduced to a greater extent than in the case of a dam configured from a single separate unit of said required thickness, because the big size lumber for obtaining the units is very expensive. The unit is installed in a state of being collapsed on said ground surface at normal times, and when a tsunami arrives, said unit rising up due to the force of the tsunami and the buoyancy of the seawater, resisting the passage of the tsunami and reducing the power of the tsunami.

A flood prevention device, for example an automatically closing air brick, is provided. The flood prevention device can comprise a body having an outer side and an inner side with an opening and a channel formed through the body, and a valve comprising a flap and a buoyancy structure, wherein the flap is pivotally mounted to the body and allows gas to flow through the channel in an open position and seals the channel in a closed position.

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.

A control gate for a channel or pond adapted to be installed across a channel for liquids. The control gate includes: at least two panels hingedly connected together, the panels having opposing sides in sealing engagement with side walls of the channel, a lowermost panel being in sealing engagement with the floor of the channel. The panels are substantially vertically aligned in a fully closed position of the control gate. At least one first lifting element is connected to the top of an uppermost panel and is adapted to lower and raise the uppermost panel relative to its hinged connection in a concertina manner to provide an overshot position for the control gate. At least one second lifting element is connected to the bottom of the lowermost panel to raise and lower the lowermost panel from the floor of the channel to provide an undershot position for the control gate.

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.

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.