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Ferns and High-Density Porous Layers in Urban Water Filtration

Author:
Yu-sheng Liu
Ferns and High-Density Porous Layers in Urban Water Filtration
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Using a vertical framework of high-density porous layers and ferns, the design effectively purifies urban river water while fostering biodiversity, creating a functional ecosystem that encourages community interaction.
5 key facts about this project
01
Integrates a vertical wetland system specifically designed for urban water purification.
02
Utilizes high-density porous layers to enhance water filtration efficiency.
03
Ferns attached to the structure improve both air quality and biodiversity.
04
Encourages habitat creation for local wildlife, including fish and birds.
05
Promotes community interaction through its accessible ecological framework.

The Vertical Wetland project presents a thoughtful solution to the challenges of urban water pollution. Located within a busy urban area, the design emphasizes the need to restore the relationship between people and nature. Its primary function is to filter contaminated river water while promoting ecological awareness and community engagement.

Design Framework
The project features a vertical wetland system composed of distinct functional layers designed to effectively purify water. At the bottom, a sand layer acts as a natural filter, removing impurities from the water that flows through. Above this layer is a high-density porous permeable layer, which supports efficient drainage and optimizes water movement. This well-structured approach allows for the removal of pollutants, laying the foundation for an effective ecological system.

Plant Integration
Plants play a crucial role in the vertical wetland's operation. Ferns are incorporated into the design for their ability to improve air quality. These plants absorb harmful substances and release beneficial microorganisms, helping to cleanse the air. By attaching these ferns to the tubular surfaces, the design highlights their importance in both the air and water purification processes. This relationship underscores how plants can serve practical functions while enhancing the environment of urban settings.

Biodiversity Creation
The design also encourages biodiversity. It is not only for human use but also establishes a habitat for various wildlife, including fish and birds. This element fosters a unique dynamic between urban life and nature, offering a richer experience for residents and visitors alike. This integration cultivates a healthier ecological environment, supporting both animal life and plant systems in an urban area.

The final design detail features the growth of ferns that visually benefit the structure. The layering of different elements creates an engaging urban presence while serving multiple ecological functions. The result is a functional system that enhances both the environment and the quality of life for those in the community.

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The Next House: USA — A Global Call to Reimagine the American Suburb

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Competition organisers

Buildner is launching The Next House: USA, a global architecture competition that challenges architects, designers, and thinkers to reimagine the American suburban home for the 21st century. For decades, the suburban house has symbolized comfort and stability, but today it often reflects excess, isolation, and environmental strain. This competition asks: how can the American home evolve to address climate urgency, economic pressures, and shifting social values?

Participants are tasked with designing a prototype home of no more than 1,500 sq ft (≈140 m²) for a household of two adults and one child. The design should be compact yet generous, adaptable, sustainable, affordable, and replicable across diverse U.S. contexts. More than a design exercise, the competition aims to spark a conversation about how homes can support healthier, smarter, and more connected communities.

The total prize fund is $20,000 USD. The final registration deadline is May 20, 2026, and winners will be announced on September 22, 2026. The Next House: USA invites architects, students, and visionaries worldwide to redefine what the American home means today—and what it should mean tomorrow.

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