A permeable surface covering unit comprises a top surface and at least two pairs of irregularly shaped mating sides, one or more passageways extending downwardly from the top surface, and at least one under channel connected to the passageways for retaining liquid, such as storm water. The sides of the unit preferably define an irregular rotational tessellation element. The passageways may comprise gaps or side cavities between units and/or core cavities or other passageways within the unit. Optional undercuts may be provided in the core cavities. Pervious material plugs are cast into the cavities extending into the channel or undercut. Thereby the plug is locked into the cavity like a rivet and resists being dislodged by mechanical or hydraulic forces. A permeable surface embodiment comprises a combination of pervious and impervious units, wherein the ratio of permeable to impermeable units and resulting surface absorption rate may be adjusted.

A photoelectric water-permeable pavement underground water storage automation system includes a photoelectric module, a water-permeable unit, and a water-filled structure. The photoelectric module is arranged on a ground surface and includes a base. A solar panel is mounted on a top of the base. Fixing members are provided on a bottom of the base and positioned on the water-permeable unit. A bare empty area is provided inside the base. Communication pipes are connected to and extended outward from the bare empty area to communicate with adjacent bases. The water-permeable unit is a water-permeable pavement including a frame structure formed of multiple vertical water-permeable pipes and poured with concrete slurry. The water-filled structure is an underground water storage space formed of multiple-hole hollow unit cells. A water guide layer is provided at the top of the water-filled structure buried in an underground layer below the water-permeable unit.

A multifunctional synthetic resin block for roads. The synthetic resin block includes a water permeable sheet configured as a synthetic resin block having a flat sheet shape so as to be laid on a ground, a block frame configured as a synthetic resin body taking a form of a rectangular frame, which is divided into multiple rectangular areas each having open top and bottom sides, so as to be installed on the upper surface of the water permeable sheet, the rectangular areas being filled with filler stones, and multiple corrugated plates each configured as a synthetic resin having a rectangular plate shape and arranged so that corrugations thereof are oriented perpendicular to each other so as to cover the rectangular areas of the block frame. The synthetic resin block provides almost all functions, such as a rainwater retention function, water permeation function, and anti-slippage function, at low cost.

A pavement slab includes a top surface, a bottom surface opposite the top surface, first and second longitudinal side surfaces, each of which extends from the top surface to the bottom surface, and first and second transverse side surfaces, each of which extends from the top surface to the bottom surface. At least one transverse tube is positioned intermediate the top surface and the bottom surface and extends from an inlet at the first longitudinal side surface to a second end intermediate the first and second longitudinal side surfaces. The at least one transverse tube is sized and shaped to convey a binder material. At least one vertical tube extends from each of the at least one transverse tube to the bottom surface. The at least one vertical tube is sized and shaped to convey the binder material.

A water generation system for improvement of water shortage environments is provided as a water generation system that is constructed as a surface pavement in a water shortage area and generally includes a sand layer, which is covered with a moisture locking cloth, a grading layer laid on the moisture locking cloth, and a water pervious layer arranged on the grading layer. The water pervious layer includes a plurality of hollow water penetration tubes vertically arranged above the grading layer. The water penetration tubes each have a tubular wall in which through apertures are formed. The water penetration tube has an outer circumference over which a tubular sleeve having an opening facing downward is fit such that an interlayer space is formed between the tubular sleeve and the tubular wall of the water penetration tube.

A water generation system for deserts is provided as a water generation system designed for desert climate areas and constructed in a surface pavement and generally includes a sand layer, which includes a water tank embedded therein and is covered with a moisture locking cloth on which a grading layer is laid. A water resisting cloth is arranged in the grading layer. Hollow water penetration tubes are arranged above the grading layer and have bottoms extending through the water resisting cloth and inserted into the grading layer with pouring and grouting of grout cement thereon to form a water pervious layer. As such, rainwater can be quickly conducted into the sand layer for storage for subsequent uses and air can be conducted into the grading layer to subject to condensation for forming condensed water on an undersurface of the water resisting cloth to achieve a purpose of automatic water generation.

A water generation system for improvement of water shortage environments is provided as a water generation system that is constructed as a surface pavement in a water shortage area and generally includes a sand layer, which is covered with a moisture locking cloth, a grading layer laid on the moisture locking cloth, and a water pervious layer arranged on the grading layer. The water pervious layer includes a plurality of hollow water penetration tubes vertically arranged above the grading layer. The water penetration tubes each have a tubular wall in which through apertures are formed. The water penetration tube has an outer circumference over which a tubular sleeve having an opening facing downward is fit such that an interlayer space is formed between the tubular sleeve and the tubular wall of the water penetration tube.

A pavement slab includes a top surface, a bottom surface opposite the top surface, first and second longitudinal side surfaces, each of which extends from the top surface to the bottom surface, and first and second transverse side surfaces, each of which extends from the top surface to the bottom surface. At least one transverse tube is positioned intermediate the top surface and the bottom surface and extends from an inlet at the first longitudinal side surface to a second end intermediate the first and second longitudinal side surfaces. The at least one transverse tube is sized and shaped to convey a binder material. At least one vertical tube extends from each of the at least one transverse tube to the bottom surface. The at least one vertical tube is sized and shaped to convey the binder material.

A permeable surface covering unit comprises a top surface, a bottom surface and at least two pairs of sides. A cavity is formed in the unit from the top surface to the bottom surface, and has side walls. The cavity may be a side cavity between units and/or a core cavity within the unit. An undercut is provided in the cavity. Pervious material plugs fill the cavity and extend into the undercut. Thereby the plug is locked into the cavity like a rivet and resists being dislodged by mechanical or hydraulic forces.

Methods, systems and devices for detectable warnings are disclosed.