
The project developed by Turenscape acts as a sponge that retains rainwater with the aim of taking advantage of it and purifying it through the use of wetland plants. The interior of the park is connected by walkways, which function as a leisure space in which to enjoy the rich biodiversity of the environment.
The old materials that the site had before the intervention are reused as a base and water filtration layers, giving shape to different reliefs that give a dynamic character to the new public space. In addition, the old tobacco factories are renovated to convert them into various facilities buildings.

Benjakitti Forest Park by Turenscape + Arsomsilp Community and Environmental Architect. Photograph by Srirath Somsawat.
Project description by Turenscape
In the bustling urban heart of Bangkok, a former tobacco factory has been transformed into a low-maintenance regenerative system that is climate resilient, filters contaminated water and provides much-needed wildlife habitat. In addition, Benjakitti Forest Park now provides the largest public recreational space for residents of downtown Bangkok, and has become a new cultural symbol for the capital city. The project, completed at low cost on a compressed timeframe of just 18 months, offers a replicable modular approach to urban engineering that can transform lifeless, concrete-paved ground into a resilient living ecosystem that provides a full range of ecosystem services.

1. Site and challenges
Bangkok is a densely populated city. The region experiences a monsoon climate with an average precipitation of about 1500 mm per year. The effects of global warming, has resulted in increased flood risk due to Bangkok’s low elevation. The 102-acre site was formerly a tobacco factory. The budget was limited and was overseen by the army that did not have extensive experience nor skills in building landscape projects.
2. Design objectives and strategies
In addressing the multiple challenges of the site, the project was envisioned as a central park capable of providing holistic ecosystem services to the city, including a demonstration of a nature-based solution for urban flood control, as well as providing badly needed public space for daily recreational activities and other cultural services. Three strategies guided our work to meet these objectives:

Reuse and recycle:All existing trees on site were preserved and integrated into the park design. Existing factory buildings were repurposed to house the sports center and museum. The demolished concrete materials were recycled for the earthwork foundation and paving.
Creating porosity and wetlands:Cut-and-fill techniques were used to transform the impermeable, concrete-paved ground into a spongy and porous landscape of wetlands dotted with islets, which is expected to retain up to 200,000M3 of storm water from the surrounding area during the monsoon season. This tilled landscape also transformed the otherwise hard clay surface soil into wet and spongy habitat, allowing a rich native plant community to establish itself with minimal irrigation or maintenance needed during the dry season. This modular landscape can be easily executed with a single excavator and minimizes dependence on skilled labor.

Fostering a low-maintenance “Messy Nature”:The modulated landform with diverse micro-environments was sown with seeds and planted with tree seedlings, creating a foundation for the subsequent evolution of a semi-natural plant community creating a new, highly dynamic and diverse aesthetic that sharply contrasts with the surrounding urban landscape.
Creating immersive places for people:Multiple boardwalks and a skywalk were designed that tie together the entire park and create a unique immersive experience amidst the tropical foliage.

3. Performance
Benjakitti Forest Park, though built in short period of time, has demonstrated a great success. In the last summer, most of Bangkok city was flooded but not this park and its vicinity. The water remediating wetland performs well and produces enough water to keep the wetland survive the dry season. 91 species of birds were seen in this rewilded urban nature. This green lung has truly become the largest central park for the densely populated Bangkok and attracts tens of thousands of visitors daily who uses it for all kinds of recreational activities. It was celebrated as the new icon for the capital city.