A storage tank according to the present invention has a concrete bottom plate laid on a bottom part of a hole dug in the ground, a storage assembly provided on the bottom plate and accommodated in the hole, a concrete quadrangular tubular side wall provided around the storage assembly on the bottom plate, and a side-wall formation member configured to form the side wall into a square frame shape. The storage assembly has a plurality of square tabular partition plates, tubular spacers connected to the partition plates, and an outermost layer part provided on the outermost side of the storage assembly. The side-wall formation member has quadrangular tubular multi-step inner molds formed of a plurality of first plate members, a plurality of vertical reinforcing bars inserted into the multi-step partition plates, and a quadrangular tubular single-step outer mold which holds a plurality of second plate members by a plurality of separators.

A hot water unit fluid supply control system comprises a switching device coupled to a hot water unit, a rainwater tank and a potable water source. The switching device is configured to selectively switch between a first state, which allows fluid communication between the hot water unit and the rainwater tank, and a second state, which allows fluid communication between the hot water unit and the potable water source. The hot water unit fluid supply control system comprises a control unit configured to: receive fluid characteristic information associated with fluid in the hot water unit from one or more sensors; activate or deactivate a pump of the rainwater tank based on a comparison of a fluid characteristic parameter of the fluid characteristic information with requirements of the hot water unit to thereby cause the switching device to assume the first or second state.

A hot water unit fluid supply control system comprises a switching device coupled to a hot water unit, a rainwater tank and a potable water source. The switching device is configured to selectively switch between a first state, which allows fluid communication between the hot water unit and the rainwater tank, and a second state, which allows fluid communication between the hot water unit and the potable water source. The hot water unit fluid supply control system comprises a control unit configured to: receive fluid characteristic information associated with fluid in the hot water unit from one or more sensors; activate or deactivate a pump of the rainwater tank based on a comparison of a fluid characteristic parameter of the fluid characteristic information with requirements of the hot water unit to thereby cause the switching device to assume the first or second state.

Individual honeycomb shaped modules used in an assembly for underground storage of storm water and other fluid storage needs. Modules are assembled into a resultant honeycomb shape for maximized structural strength and material use efficiency. Internal hexagonal or square shaped modules are assembled and encased by external hexagonal or square shaped modules. Internal adjacent modules are in direct fluid communications with one another through a channel-less chamber. Internal hexagonal or square shaped modules drain into external hexagonal or square shaped modules chamber where fluid is either stored or drained. Assemblies include various top and side pieces along with access ports for entry into said assembly.

Individual honeycomb shaped modules used in an assembly for underground storage of storm water and other fluid storage needs. Modules are assembled into a resultant honeycomb shape for maximized structural strength and material use efficiency. Internal hexagonal or square shaped modules are assembled and encased by external hexagonal or square shaped modules. Internal adjacent modules are in direct fluid communications with one another through a channel-less chamber. Internal hexagonal or square shaped modules drain into external hexagonal or square shaped modules chamber where fluid is either stored or drained. Assemblies include various top and side pieces along with access ports for entry into said assembly.

Individual square shaped modules used in an assembly for underground storage of storm water and other fluid storage needs. Modules are assembled into a resultant square tilling shape for maximized structural strength and material use efficiency. Internal square shaped modules are assembled and encased by external square shaped modules. Internal adjacent modules are in direct fluid communications with one another through a channel-less chamber. Internal square shaped modules drain into square shaped modules chamber where fluid is either stored or drained. Assemblies include various top and side pieces along with access ports for entry into said assembly.

A rain gathering and storing system includes a housing having a top-portion, a bottom-portion, an inner volume, a first-drain, and a second-drain, and a water proof liner configured to contain water within the inner volume of the housing. The bottom-portion may be sloped to direct the water to the second-drain. The water proof liner is able to be built-in to a form of the housing of the rain gathering and storing system which is configured for use in collecting the water. The water proof liner may be used for multiple applications with adaptable installation.

A rain gathering and storing system includes a housing having a top-portion, a bottom-portion, an inner volume, a first-drain, and a second-drain, and a water proof liner configured to contain water within the inner volume of the housing. The bottom-portion may be sloped to direct the water to the second-drain. The water proof liner is able to be built-in to a form of the housing of the rain gathering and storing system which is configured for use in collecting the water. The water proof liner may be used for multiple applications with adaptable installation.

The invention relates to a collection device (10) that comprises a plurality of collection containers (12A, 12B, 12C) suitable for receiving rainwater, each collection container (12A. 12B, 12C) comprising a circumferential wall (14) and a lower wall (16). The collection containers (12A, 12B, 12C) are stacked so as to form a stack along a vertical axis (Z). Each container (12A, 12B) arranged above another, adjacent container (12B, 12C) comprises a water flow opening (18) that is provided in the lower wall (16) thereof and leads into said other, adjacent container (12B, 12C). Each container (12B, 12C) that is arranged below another, adjacent container (12A, 12B) houses a buoyant closure element (20) that is movable along the vertical axis (Z) between a lower position and an upper position depending on the amount of water in said container (12B, 12C) and closes the flow opening (18) in the upper position.

Disclosure is provided of various methods of using rainwater that falls off a roof of a building. Disclosure includes methods of capturing rainwater that falls off a roof of a building. Preferably, rainwater is captured in a watering can. Disclosure is also provided relating to use of a flow device. With reference to using rainwater that falls off a roof of a building, this may be particularly useful for use relating to balconies and porches, for example.