High-efficiency water drainage systems designed for Seoul's dense urban landscape and Sponge City initiatives.
As one of the world's most densely populated metropolises, Seoul, South Korea, faces unique challenges in urban water management. The city's rapid expansion, combined with the increasing frequency of heavy monsoon rains, has necessitated a paradigm shift toward advanced Water Storage and Drainage Systems. In recent years, Seoul has emerged as a global leader in "Smart City" initiatives, integrating AI-driven monitoring with high-performance geotechnical materials to mitigate urban flooding and optimize groundwater recharge.
The commercial landscape in Seoul for water management is currently dominated by a move toward the Sponge City concept. This involves the large-scale application of HDPE geomembranes, siphonic drainage systems, and permeable underground structures. Districts like Gangnam and Songpa are actively upgrading their underground drainage tunnels and green roofs, creating a massive demand for manufacturers who can provide customized, durable, and environmentally friendly solutions. Our role as a premier manufacturer is to supply these critical components that allow Seoul to breathe amidst its concrete jungle.
The integration of IoT sensors with siphonic drainage systems is the latest trend in Seoul. These systems allow real-time monitoring of water flow and storage capacity, preventing overflows in critical areas like the Seoul Subway stations.
With Seoul's 2050 Carbon Neutrality goal, there is a significant shift toward 100% recyclable HDPE and LLDPE geomembranes. Manufacturers are now focusing on low-emission production processes for earthwork films.
Seoul's limited ground space has led to the rise of rooftop and vertical gardens. This requires advanced water accumulation and drainage plates that are lightweight yet capable of supporting complex irrigation needs.
The company specializes in the production of smooth geomembrane, rough geomembrane, double color geomembrane, geotextiles (polyester short fiber non-woven fabric, polyester long fiber non-woven fabric, polypropylene short fiber non-woven fabric, hot-rolled non-woven fabric), drainage board, drainage net, geogrid, geocell, flexible permeable pipe, plastic blind drain and other environmentally friendly geosynthetic materials. Relying on a long-term and stable raw material supply system and strict product formulas, we can customize various material products such as HDPE, LDPE, EVA, and ECB according to the specific geological requirements of the Seoul metropolitan area.
Our company's products have a wide range of applications, featuring anti-aging, long service life, environmental friendliness and non-toxicity. In Seoul, it is mainly applied to environmental protection landfill sites, artificial lakes (such as those in the Olympic Park), chemical plant slag yards, tailings DAMS, highways, railways, water conservancy, power, soil and water conservation, environmental greening, and various reservoirs. The complex terrain of the Korean Peninsula requires materials that can withstand both freezing winters and humid summers, a challenge our products meet with ease.
The company has passed the ISO9001, ISO14001 and OHSAS18001 certifications, and has professional technical personnel and advanced equipment and instruments. There are currently over 60 employees, including 3 chief chemical process engineers, 5 mechanical engineers and 9 professional equipment operation engineers. The above-mentioned professionals have many years of practical working experience. The strong technical strength ensures the stability and forward-looking nature of the products. The company has always kept an eye on the world's advanced level. With its strong economic and technological strength, it maintains leading geosynthetic material production lines and testing equipment. Relying on a complete product production system and quality inspection system, it creates high-quality and high-standard products for the Seoul market.
In response to recurring floods in Gangnam, our Sponge City Siphonic systems and high-density drainage plates are utilized in constructing massive underground storage tanks. These systems allow for the rapid diversion of surface water into subterranean reservoirs, preventing street-level flooding.
Geomembranes and geotextiles are essential in maintaining the water levels and soil stability of the Cheonggyecheon Stream. Our Double Color Geomembranes provide an aesthetic yet functional layer for artificial water bodies throughout Seoul’s parks.
The extensive Seoul Metro network relies on our Flexible Soft Permeable Pipes and waterproof boards to manage groundwater seepage. These materials ensure that the tunnels remain dry and structurally sound even in high-pressure subterranean environments.
Exploring our full range of high-standard drainage and waterproofing materials.
Changhong Engineering Materials Co., Ltd. is always committed to making friends with customers, getting close to them with sincerity, satisfying them with actions, and achieving win-win results with them. Based on excellent products and services, we provide customers with stable and advanced products and services, and establish long-term friendly cooperative partnerships with customers in Seoul and throughout East Asia.
Our commitment to the Seoul Water Storage and Drainage System market is reflected in our continuous investment in R&D. We understand that as Seoul continues to evolve into a smarter city, the demand for invisible infrastructure—the materials beneath our feet—will only increase. Whether it is a new park development in Incheon or a high-rise foundation in Gangnam, our materials provide the security and durability required for 21st-century engineering.
Changhong
