A trench drain connection interface for connecting a first trench drain to a second trench drain. The trench drain connection interface comprises a male end, a female end, and at least one protrusion. The male end of the first trench drain has a flange. The female end of the second trench drain has a flange-receiving recess. The at least one protrusion is on at least one of the male end and the female end. The male end of the first trench drain is configured to engage the female end of the second trench drain and when the male end engages the female end, the at least one protrusion prevents at least a portion of the flange from contacting an inner surface of the flange-receiving recess, thereby providing clearance between the flange and the inner surface of the flange-receiving recess.

A modular porous swale filtration system. The modular porous swale filtration system may comprise one or more modular porous swales, absorption media, liner, and perforated pipe. Each modular porous swale may have a porous concrete block and filtration joint. The porous concrete block may snugly fit within a trench having a lower portion filled with the absorption media. The absorption media may include gravel, activated alumina, bone char, or an activated alumina and bone char mixture. The porous concrete block may have a top surface inwardly-sloped to a nadir. The filtration joint may be disposed within the porous concrete block and along the nadir. The liner may cover one or more surfaces of the trench. The perforated pipe may be located within the absorption media. The filtration joint may substantially align above a portion of the perforated pipe when the modular porous swales are installed within the trench.

A lightweight universal panel mat (100, 400, 500, 600, 700, 800, 1100, 1500, 1800, 2005, 2010, 2015, 2020) made of plastic or elastomeric material and having a first section that provides a relatively flat, textured or structured top surface to facilitate movement over the mat and a second section having geometry that includes a plurality of cells having top surfaces that support the first section. The panel mats have first, second, third and fourth sides (110,120,135,145) that are configured to matingly engage or connect to the second, third, fourth and first sides, respectively. The connection can be by insertion or snap-locking of one side to another, or by the use of fastening elements that more securely holds the sides together. Thus, similarly configured panel mats can be connected by interlocking to form a temporary support surface, deck, walkway or roadway. Additional side ramps (2030) and adapters (2050) can be used to facilitate installation of the mats (2005, 2010, 2015, 2020) and access to the upper surfaces of the joined mats.

An impact-absorbing assembly includes a covering layer being one or more of artificial turf, rubber mats, polymer mats, short pile carpeting, particulate infill, wood chips, and ground rubber chips. Also included is a layer of underlayment panels positioned beneath the covering layer. The panels have a panel section with a plurality of drain holes formed therethrough. A top surface of the panels is configured to support the covering layer. A bottom surface of the panels has a plurality of bottom projections that cooperate to define bottom channels suitable to permit water flow across the bottom surface, the bottom channels being in fluid communication with the panel drain holes. The bottom projections define a first spring rate characteristic that is part of a first stage and a second spring rate characteristic is part of a second stage, the first stage having a smaller volume of material than the second stage.

A roundabout for vehicular traffic is provided from a plurality of modular blocks arranged in a generally circular roundabout pattern and affixed to a roadway or ground surface at an intersection of vehicle roadways. Roundabouts can be formed in any desired diameter. In some embodiments, the modular blocks can have a trapezoidal plan shape laid out in concentric rings. The trapezoidal shaped blocks can be cut from a length of board having a constant width and thickness. The modular blocks can be provided as a kit of parts delivered to worksite at an intersection of vehicle roadways where a roundabout is desired. Splitter islands, sidewalks, and curbing of blocks having appropriate shapes can also be provided.

A drain is provided which may be used in a surface including a paver stone. The drain includes a body having an upper wall and a cavity extending from the upper wall. The body further includes a drain opening in fluid communication with the cavity. The body additionally includes a plurality of support members. Each support member at least partially extends into the cavity and includes a support surface, with the support surfaces of the plurality of support members being configured to collectively support a paver stone placed thereon. The drain additionally includes a plurality of retainers selectively engageable with the body to collectively define a paver zone sized to receive the paver stone. The body includes a drainage pathway from a location outside of the paver zone, through the cavity and to the drain opening.

A paving block system comprising a plurality of paving block units (A) and a plurality of paving block units (B) interlocked together to form a paving block system. The paving block units each comprise at least two channels formed along a bottom face of the paving block units. The channels of the paving block units (A) are in fluid communication with the channels of the paving block units (B) when the paving block units are interlocked together to form the paving block system configured for storage and/or drainage of fluid.

A method for permeable pavement of dirt interception comprises laying a permeable structure layer with a toothed groove between the base layer and the transition surface of the cushion layer or directly setting the upper surface of the cushion layer as a toothed structure; in the base layer, laying at least one layer of dirt interception trough; providing a water-permeable coating or fine sand at the bottom of the sewage interception trough; the present invention traps the dirt between the base layer and the cushion layer that are most likely to cause void blocking in the base layer, close to the shallow part of the surface layer is used to remove dirt by high-pressure flushing operations.

Structural cells and matrices using the structural cells for positioning below a hardscape that define a void space therein, the structural cells, matrices using the cells and methods of assembly allowing in one embodiment the introduction of a structural fluid such as concrete to provide an alternative structural cell and matrix product. In one embodiment a structural cell assembly is described comprising a structural cell with a plurality of legs integrally linked to a frame at a first frame end, the frame linking the legs together and the frame defining a generally flat plane with the legs extending substantially orthogonally away from the first frame end about the frame flat plane to a leg terminal end; and a separate plate engaging the legs, the separate plate comprising linked sockets, each socket engaging the leg terminal end; and/or linked sockets, each socket engaging the leg frame ends or a part thereof.

A concrete pavement structure includes a base layer directly coated by a wearing layer, wherein the base layer is a concrete base layer and the wearing layer is an elastomer modified pervious concrete layer, having a thickness below to 4 cm, a void content ranging from 5% to 20% in volume, and a maximal diameter of aggregates present in the polymer modified pervious concrete layer is 10 mm.