A valve device includes: a hollow member having a through-hole with an axis, an internal surface delimiting the through-hole, a peripheral surface delimiting the hollow member's transverse extent with respect to the axis, and at least one deformation zone deformable to reduce the transverse extent when compression forces act on the peripheral surface, the deformation of the deformation zone moving the hollow member from a rest to a use state, and at least one closure portion extending radially from the hollow member inside the through-hole up to a respective free edge, in contact with the internal surface of the hollow member and/or with at least one free edge of another closure portion occluding the through-hole when in use. The at least one closure portion includes a flexible membrane, foldable when subjected to a fluid and/or solid pressure which moves in the through-hole along the axis, thereby defining a passage.

A removable catch basin filter insert includes a filter container is fitted into a catch basin in the ground at the location where the stormwater exits the gutter and enters the stormwater sewer system. The removable catch basin filter provides pollution capture from stormwater while being easily cleaned. A hinged cover is included at the top of the filter insert to allow the captured pollutants to be evacuated through the use of a vehicle or being tipped nearly upside down by a mechanical arm. A hinged trap door is included at the bottom of the filter insert to allow captured pollutants to be evacuated through the bottom of the device and into a container. By capturing the pollutants with the removable catch basin filter insert before the pollutants enter the mainline storm drain system, clean storm drain systems are provided allowing for cleaner waterways.

A check valve includes a plate-shaped valve seat member provided with a fluid discharge port, a plate-shaped valve member provided on a downstream side of the valve seat member and configured to open/close the discharge port, a coil spring provided on a downstream side of the valve member and configured to bias the valve member toward the discharge port, a spring receiving member provided for the coil spring on a downstream side thereof, and a plurality of guide rods provided at the periphery of the valve member and formed to extend in an upstream-to-downstream flow direction, each having a downstream end portion attached to the spring receiving member, and configured to guide the valve member in the upstream-to-downstream flow direction.

Disclosed herein is a trap assembly for draining waste water toward sewer pipes while blocking back flow of odors. In a preferred embodiment the trap assembly comprises of a housing having a hollow interior, open, upper and lower ends. The housing is connected to a drain pipe at the lower end and extending outwardly therefrom into a substantially vertical orientation, a valve member formed of buoyant material; a retainer assembly connected to said housing in an at least partially supporting relation to a valve member. Further the valve member disposable into and out of sealing engagement with the valve seat dependent on direction of liquid flow along a flow path.

A warning device for detecting water level in drainage well includes at least one level sensor and a transceiver. The level sensor includes an antenna and a first processing unit connected to the antenna. The first processing unit controls the antenna to transmit a signal to the transceiver as to increased fluid levels. The transceiver includes a first communication module and a second processing unit, the first communication module receives the signal and the second processing unit obtains the signal from the first communication module and determines the location of the level sensor and its urgency according to whether the signal decays or disappears because of inundation by drainage fluid. The second processing unit further sends information of the target level sensor to a terminal device.

An apparatus for continuously controlling fluid flow in a sewer conduit, comprising: a) moisture sensors detecting levels of fluid in this conduit; b) an inflatable bladder, mounted in the sewer conduit for releasably sealing in fluid tight fashion a section of this conduit; a compressed air source for inflating the bladder; and a control box including a CPU sensitive to the moisture sensor(s) and actuating the air compressor responsively to conduit fluid level conditions reaching beyond a preset threshold value. The performance of the apparatus is independent of the speed of fluid flow in the sewer conduit.

An inflatable system is described herein, including a body, a top, a bottom, an interior cavity, and a fluid inlet. In one aspect of the present teaching, the top and the bottom are on opposite sides of the body, approximately parallel to one another. The stem opening is located on the top of the body, wherein the stem opening allows the entry of fluid into the interior cavity of the body. The inflatable system is made of a material which allows for stretching when the inflatable system is inflated.

A combined sewer/enclosure overflow (CSO) sensor system is described for accurate detection and measurement of overflow events. From the combined data, trending information can determine if there is debris accumulation. Rain masks can be used in the trending data to measure overall health. External sensors in combination with the CSO sensors provide predictive information and additional levels of information/data accuracy. The sensor system automatically and remotely monitors CSO locations and provides real-time data regarding start times, stop times, duration, and flow volumes of overflows that occur in these structures and provide regulatory and public notification of these events.

A combined sewer/enclosure overflow (CSO) sensor system is described for accurate detection and measurement of overflow events. From the combined data, trending information can determine if there is debris accumulation. Rain masks can be used in the trending data to measure overall health. External sensors in combination with the CSO sensors provide predictive information and additional levels of information/data accuracy. The sensor system automatically and remotely monitors CSO locations and provides real-time data regarding start times, stop times, duration, and flow volumes of overflows that occur in these structures and provide regulatory and public notification of these events.

A storm water capture and filtration system may secure in a catch basin or other area subject to flows of water from streets, channels, and the like as a result of run off from storms. A filter system may include a capture portion including attachment mechanisms, a funnel, various supports, and a filter hanger designed and calculated to capture all water entering a storm water inlet and directing it toward a bag filter. A gap is provided between a funnel and filter hanger in order to provide accommodation for overflow, while an anti-backflow skirt on the filter bag resists flushing of captured pollution out of the bag in overflow condition.