Wetlands are among the Earth's most vital ecosystems, offering significant benefits, including natural water filtration, flood protection, and rich biodiversity. In many regions, including the Philippines, these wetlands are not only ecological treasures but also the lifeblood for communities that have thrived alongside them for generations.
OBJECTIVE
The pressing question we must address is this: How can we enable these communities to coexist with wetlands in a way that preserves their ecological integrity and ensures their survival? We must find sustainable solutions that protect these invaluable ecosystems while supporting the people who depend on them. This is where the green building concept offers meaningful solutions. Instead of treating wetlands as obstacles to development, green building integrates human habitation with ecological preservation—designing homes and communities that respect, adapt to, and even enhance their natural surroundings.
WHAT IS A WETLAND?
In accordance with the definition on Wikipedia.org, "A wetland is a distinct semi-aquatic ecosystem whose groundcovers are flooded or saturated in water, either permanently, for years or decades, or only seasonally. Flooding results in oxygen-poor (anoxic) processes taking place, especially in the soils. Wetlands form a transitional zone between waterbodies and dry lands, and are different from other terrestrial or aquatic ecosystems due to their vegetation's roots having adapted to oxygen-poor waterlogged soils. They are considered among the most biologically diverse of all ecosystems, serving as habitats to a wide range of aquatic and semi-aquatic plants and animals, with often improved water quality due to plant removal of excess nutrients such as nitrates and phosphorus."
According to the Philippine Department of Environment and Natural Resources, the Biodiversity Management Bureau:
"Wetlands are ecosystems that may be natural or artificial and are permanently or seasonally saturated or flooded with water that may be static or flowing. Basically, they refer to any land areas that have waterlogged soil. In Republic Act No. 11038, also known as “Expanded National Integrated Protected Areas System Act of 2018,” wetlands refer to:
- Inland habitats – marshes, peatlands, floodplains, rivers, and lakes;
- Coastal and marine areas – saltmarshes, mangroves, intertidal mudflats and seagrass beds, and also coral reefs and other marine areas no deeper than six (6) meters at low tide; and
- Human-made wetlands – dams, reservoirs, rice paddies and wastewater treatment ponds and lagoons."
PERSONAL INSIGHT
We may compare wetlands to a kidney for their remarkable ability to filter pollutants and enhance water quality. These vital ecosystems provide essential services, such as flood control, groundwater recharge, and a sanctuary for countless species of aquatic and semi-aquatic plants and animals. By serving as nurseries for fish and other aquatic life, wetlands foster biodiversity and support vibrant ecosystems. Furthermore, their crucial role in carbon sequestration is pivotal in the fight against climate change, as they store carbon dioxide that would otherwise exacerbate global warming. Protecting and preserving wetlands is not just beneficial; it is essential for a healthy environment and a sustainable future.
GREEN BUILDING RELATED CONSIDERATIONS IN DESIGNING FOR WETLANDS
Building with Sensitivity to Place
The first principle of green building in wetlands emphasizes the need to respect the land's delicate balance. It is essential to avoid disturbing core wetland areas and to honor the natural buffer zones that protect them. By clustering homes and facilities on less-sensitive ground, we can reduce our ecological footprints while still fulfilling the community's needs without the negative impacts of sprawling developments. Stilt houses have long been a traditional solution in wetland communities for good reason—they allow water to flow freely beneath while keeping inhabitants safe from floods. Embracing this wisdom, green building advocates for raised, lightweight, and modular structures that harmonize with nature rather than combat it. This approach not only promotes sustainability but also enhances community resilience in the face of environmental challenges.
Example – The Philippines: In Agusan Marsh, one of the country’s most significant wetlands, the indigenous Manobo people traditionally live in floating houses locally called “baylan.” These houses rise and fall with the water level, a natural form of climate-adaptive architecture. Integrating modern green design—such as solar panels and rainwater collectors—could enhance these floating homes while preserving cultural heritage.
Designing for Water and Climate
Water is life in wetlands, but it also poses the biggest challenge. Green building promotes:
Rainwater harvesting and greywater recycling to reduce the draw from wetland water sources.
Constructed wetlands for natural wastewater treatment, keeping real wetlands free from contamination.
Flood-adaptive designs, such as amphibious or floating homes, ensure resilience as water levels shift with seasons or climate change.
Example – Cambodia: On Tonle Sap Lake, communities live in floating villages where schools, houses, and even markets rest on the water. Some pilot projects have introduced solar-powered floating schools, combining traditional living patterns with modern renewable energy solutions.
Example – Philippines: In Candaba Swamp (Pampanga), where seasonal flooding is part of life, green building principles could support adaptive housing and eco-tourism lodges that rise with water levels while using renewable energy systems, turning natural challenges into sustainable opportunities.
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| Candaba Swamp, Pampanga |
Energy, Resources, and Daily Life
Wetland communities often face limited access to reliable energy. Green building responds with renewable and efficient systems: solar panels, biogas stoves, and natural ventilation strategies that minimize dependence on external grids. Locally sourced and renewable building materials—such as bamboo and reclaimed wood—further reduce ecological impact while reflecting cultural identity.
Example – Nigeria: The Makoko Floating School in Lagos was a prototype structure designed on a triangular floating platform. Though experimental, it demonstrated how renewable energy and modular design can provide education while coexisting with wetlands.
People and Ecosystems Together
The integration of green building in wetland areas offers a transformative community-centered approach that cannot be underestimated. Many wetland communities are rich in ecological knowledge, possessing a deep understanding of which plants stabilize banks, how to fish sustainably, and how to align their lives with the rhythms of nature. By combining this invaluable traditional wisdom with modern science and sustainable technologies, green building revitalizes and strengthens these foundational practices. Adopting biodiversity-friendly methods—like planting native riparian vegetation, establishing green buffers, and implementing aquaponics systems—creates thriving ecosystems for both people and wildlife. Moreover, sustainable ecotourism can open up new economic opportunities while fostering a sense of responsibility to protect these vital wetlands for generations to come. Embracing these practices not only benefits our environment but also enriches our communities.
Example – Philippines: In Olango Island Wildlife Sanctuary (Cebu), eco-lodges and boardwalks have been built with sensitivity to migratory bird habitats. By following green design principles, these facilities provide tourism income while minimizing disturbance to wetlands and wildlife.
Boardwalks built in Olango Island, Cebu.
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| Boardwalks built in Olango Island, Cebu. |
ABSTRACT
Living with Water, Not Against It
In wetlands, green building is not about imposing rigid, concrete solutions. It is about designing with the water, not against it. By minimizing ecological disturbance, embracing adaptive architecture, and involving communities in every decision, green building makes it possible for people to live comfortably while ensuring that wetlands remain vibrant ecosystems. "Because when wetlands thrive, so do the communities within them."
FINAL THOUGHTS
A Call for Collaboration
The integration of green building concepts in wetlands is not merely an architectural challenge but an important collective responsibility that we all share. Policymakers, architects, engineers, and local communities must unite to devise solutions that balance human aspirations with ecological integrity. In the Philippines, wetlands like Agusan Marsh, Candaba Swamp, Laguna de Bay, and Olango Island are lifelines, providing essential resources and ecological protection. The urgency of this collaborative approach is particularly evident here. By investing in adaptive housing, renewable energy systems, and eco-tourism facilities designed for sustainability, we can safeguard these delicate ecosystems while enriching the lives of communities that depend on them.
Green building in wetlands is about redefining progress, not restricting it. It is about embracing a vision that honors nature’s rhythms, fosters biodiversity, and strengthens communities for future generations. Now is the moment to take action. By designing with water in mind, rather than against it, we can ensure that wetlands remain vibrant spaces of life, culture, and a harmonious coexistence between humanity and nature. Let us commit to this vision and secure a sustainable future together.
Ar J CASTANEDA
Architect, Sustainable Architecture
Link in account for architectural works.
CITATIONS:
https://bmb.gov.ph/protected-area-development-and-management/philippine-wetlands/
PHOTO ATTRIBUTION
CANDABA SWAMP, PAMPANGA
Judgefloro, Public domain, via Wikimedia Commons
<ahref="https://commons.wikimedia.org/wiki/File:03256jfBaliuag_Candaba_Roads_Swamps_Pampanga_Highway_Bulacanfvf_10.JPG">Judgefloro</a>, Public domain, via Wikimedia Commons
OLANGO ISLAND, CEBU
Elmer nev valenzuela, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons
<a href="https://commons.wikimedia.org/wiki/File:The_Long_Walk.jpg">Elmer nev valenzuela</a>, <a href="https://creativecommons.org/licenses/by-sa/4.0">CC BY-SA 4.0</a>, via Wikimedia Commons
https://upload.wikimedia.org/wikipedia/commons/7/72/The_Long_Walk.jpg
https://commons.wikimedia.org/wiki/File:The_Long_Walk.jpg
Cover photo is an original image created by Architalktural. Copyright 2025, all rights reserved.
