The water harvesting module construction method, which is mostly used in such facilities as the retarding basin, the raining storage in site, and the rainwater recycling, is a mature technology that has undergone many generations of improvement in the international arena. Nevertheless, it has not been popularized in Taiwan until recent years. The BGECL is not just the only engineering team that offers one-stop complete service, including design, R&D, production, on-site application and construction, but it has on its own developed a lightweight PP plastic module with high strength and high porosity. Such a module can be installed fast, has high water storage capacity, and can carry the burden of a thick soil layer above it, making it convenient for the planning of green parks, parking lots and other facilities, and simultaneously meeting the needs of space applications and water resources management.

The BGECL said: "In addition to using recycled plastics to make modules, we are also the only team in the world that has passed the certification for low carbon construction method in the water harvesting module. Compared with the traditional RC retarding basin, our construction method can reduce the overall carbon emissions by 82%~ 84%, realizing the core concept of environmental friendliness."

Owning a proud track record of being commissioned with hundreds of projects in public spaces, private enterprises, and construction projects, the BGECL boasts off its largest construction of a single-seat retarding basin exceeding 3,000 cubic meters and its construction quality and efficiency comparable to the world's first-class brands, whether the project is underground or the innovative design of the upper and lower double-layer structure. Moreover, the BGECL has also signed MOU or agency contracts with Southeast Asian manufacturers as its products are highly praised by the industry there.

In short, the Shallow Water Harvesting Module is a thin-type Water Harvesting Module construction method, mainly to solve the problem of land scarcity faced by densely populated and highly developed urban elite areas. By placing the water harvesting modules in the gap between the bricks and pipelines, a space only about 10~15 cm high, we can directly optimize the mechanism for water environment of existing public spaces such as the sidewalks and the squares and improve the functions of flood reduction, flood control and water storage in all districts of a city. Considering the need to directly bear the pressure of the bricks, the BGECL has also used in this construction method the recycled PP material modules, known for their highest intensity in the market. Although the modules are thin and light, they can endure the pressure caused by riding motorcycles on the sidewalks, a habit of Taiwanese people, ensuring to meet the requirement for service life.

Common permeable pavements have long-standing problems such as uneven surface, easiness to break, and difficulty in maintenance. This is because traditional structures are spliced by independent elements with insufficient strength while the common integrated permeable pavement often deforms and deviates due to inappropriate weight of slurry during the forming process. On the contrary, the new PP plastic mold designed by the BGECL is easy to demold and the slurry is stable. Thus, it can create a continuous concrete structure with integral molding, flat surface and high support force. The interconnected permeable holes within the structure can be used not only to plant grass as its roots can be fully stretched, but also to be directly filled with gravel as an ecological permeable hole. This is indeed an excellent choice for both strength and water permeability.

Roadside trees are one of the factors that regulate the urban microclimate. However, when trees are planted, the soil under the pavement bricks is often so compacted to give the road surface the greatest strength possible. As a result, the tree roots are forced to pass through the gap between the pavement and the bottom layer, and this may cause a floating root problem that may destroy the sidewalk. The Soil Structure Module proposed by the BGECL uses recycled PP plastic materials to create a room for root growth that can be filled with soft soil and guide roots. It also supports the pavement bricks through a high-strength structure, whether the roadside trees are newly planted or existing ones, thus creating a suitable soil ecological environment for trees to grow, alleviating the heat island effect, improving the living environment, and absorbing and degrading urban pollutants.

The lightweight plastic piling is also used as a structure for blocking seepage water. Its construction equipment is the same as that of the steel sheet pile, but it is more convenient to transport and build. Moreover, as plastics are not affected by sunlight, no rust problem in the soil will occur. Thus, it can extend service life and give a better overall cost-effectiveness.

The mastery of recycled PP plastics and structure enables the BGECL to realize a variety of new designs which are porous and strong to provide more efficient and environmentally friendly solutions. The BGECL pointed out: "The focus of a sustainable water environment is to pursue a resilient city with tolerance and resilience. In fact, there are still many opportunities for optimization in the existing urban space. The change of concept from “no flooding” to “no fear of flooding” will drive the upgrade of a new generation of facilities, which is also the direction of our continuous efforts."