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Benjakitti Forest Park is a public wetland park created on the former site of a tobacco factory in central Bangkok. Its transformation replaced much of an almost entirely paved brownfield with wetlands, islets and porous ground, while retaining trees and reusing buildings and concrete. The design was intended to manage monsoon runoff, improve water quality, support habitat and provide public space—not just add ornamental landscaping.
The project shows how landscape and construction decisions can work together: excavated and reused material shaped a water-sensitive site, and existing assets became part of the new park. But reported water figures describe different systems and should not be treated as interchangeable proof of flood reduction.
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What was Benjakitti Forest Park before it became a wetland?
The park occupies a former tobacco-factory property in Bangkok’s Khlong Toei area. The Cultural Landscape Foundation describes the completed park as approximately 102 acres and dates its completion to 2022. The site had been an industrial property with extensive paved ground; the American Society of Landscape Architects (ASLA) describes it as almost entirely paved before redevelopment.
That starting condition matters. A large paved site sheds rainwater rather than allowing much of it to soak into the ground. In a city that experiences monsoon rainfall, the project team’s challenge was therefore not simply to make the former factory grounds greener. The design had to reorganize the land so it could accommodate water, create varied ecological conditions and remain usable as a public park.
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Turenscape and Arsomsilp are credited as the design team. The ASLA award entry identifies Thailand’s Ministry of Finance as the client. The project is associated with the “sponge city” approach: using landscape form and ecological systems to absorb, hold, filter or otherwise manage water while serving other urban needs. That description is a design framework, not by itself a measurement of how much flooding the park prevents.
How did the design transform the paved brownfield?
The documented design moves were to preserve existing trees, adapt factory buildings for reuse, recycle demolished concrete for earthwork and paving, and use cut-and-fill to create wetlands, porous areas and islets. In combination, these decisions changed both the site’s surfaces and its topography.
Cut-and-fill means excavating material in some places and using it elsewhere to shape the site. At Benjakitti, the ASLA project account links that approach to creating wetlands and islets. Rather than treating excavation solely as a way to clear the site, the design used changes in ground level to make room for water and establish different landscape conditions. The available sources do not give detailed construction drawings, quantities of excavated material or a construction sequence, so those should not be inferred from the finished landscape.
Replacing hard ground with a porous landscape was central to the transformation. Wetlands and planted ground can interact with rainwater differently from continuous paving: the design intent was to retain stormwater during monsoon periods and create a landscape that could support water-related and ecological functions. This does not mean every paved area was removed, or that the park alone manages Bangkok’s rainfall. The project description supports a site-scale design strategy, not a claim that the wider city’s drainage needs have been solved.
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Retaining trees and reusing structures also made the existing site part of the design rather than treating it as a blank slate. Factory buildings were adapted for reuse, according to the ASLA account. The sources do not specify which buildings now serve which uses, or quantify the amount of demolition avoided. The sound conclusion is narrower: the project incorporated existing trees and buildings into its redevelopment plan.
Recycling concrete gave material from demolition a second use in earthwork and paving. That can reduce the need to discard material and bring in entirely new fill or paving inputs, although the cited project account does not provide tonnage, transport distances, embodied-carbon calculations or a quantified waste reduction. The material-reuse strategy is documented; its precise environmental savings are not.
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How is the park intended to manage stormwater?
The park’s water strategy combines landform, wetlands and a connected constructed wetland system. The functions described by project and institutional sources include retaining rainwater, treating polluted runoff and cleaning canal water. Those functions are related, but they are not the same, and the published figures refer to different scopes.
ASLA’s 2024 award entry says the design is expected to retain up to 200,000 cubic metres of stormwater during monsoon season. This is an expected retention capacity stated in the project account—not a measured annual flood-reduction result. The Cultural Landscape Foundation separately describes four lakes with capacity for one million cubic metres of stormwater. Its retrieved page does not state a year for that figure, and the available descriptions do not explain how it relates to ASLA’s estimate.
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A third figure refers to water treatment, not rainwater storage. The Centre for Liveable Cities’ 2025 Bangkok case study reports that a connected constructed wetland can clean up to 8,152 cubic metres of canal water per day. A daily treatment flow describes water moving through a treatment system; it cannot be added to a storage capacity or used as a substitute for one.
| Reported figure | What the source says it describes | Source and date |
|---|---|---|
| Up to 200,000 m³ | Stormwater expected to be retained during monsoon season | ASLA, 2024 |
| One million m³ | Capacity of four lakes described as holding stormwater | The Cultural Landscape Foundation; year not stated on the retrieved page |
| Up to 8,152 m³ per day | Canal water cleaned by a connected constructed wetland | Centre for Liveable Cities, 2025 |
These are separate reported claims, not three measures of one performance outcome. The sources do not establish a common measurement method or reconcile the two storage figures. For a construction or landscape project, that distinction is essential: a design capacity, a lake volume and a daily treatment flow answer different questions. None alone demonstrates how the site performs through a particular storm, season or year.
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The project is described as serving several purposes at once: regulating monsoon stormwater, filtering polluted urban runoff, providing habitat for native species, and offering downtown residents recreation and cultural space. The landscape is therefore not presented as a single-purpose drainage basin. Wetlands, planted areas, pathways and retained structures contribute to a public environment as well as to water-related aims.
The ASLA entry describes a planting strategy intended to establish a semi-natural community across varied micro-environments, with limited maintenance. This is the project’s design intent, not an independently measured finding about long-term maintenance needs. The sources provided do not give a maintenance budget, staffing plan, survival rate for planting or long-term ecological monitoring results.
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Habitat claims also need a date and attribution. An International Union for Conservation of Nature report from 2025 gives a figure of 91 bird species in its park summary. That is a reported biodiversity figure, not a current census established by the sources here. It offers evidence that the park has ecological significance, while leaving open how species numbers change over time and how they were surveyed.
What can visitors experience in the park?
Project materials describe boardwalks and a skywalk that connect parts of the park and offer a route through tropical foliage. These features allow visitors to experience the landscape at different levels and move through planted areas rather than viewing the park only from its perimeter. They are part of the project’s public-recreation role, alongside its ecological and water-management aims.
Current opening hours, entry arrangements, facilities and access rules were not verified in the sources used for this account. Visitors should consult current information from the park authority before planning a trip rather than relying on older project descriptions for logistics.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What can construction projects learn from the transformation?
Benjakitti Forest Park is useful as a case study in making site constraints part of the design brief. The starting point was a paved former industrial property. The documented response connected earthwork, water, materials, existing trees and buildings, habitat and public use instead of treating each as an isolated issue.
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- Plan grading around water as well as access. Cut-and-fill can form wetlands and islets, but the sources do not provide project-level grading data. The transferable lesson is to coordinate landform and water goals early, not to assume this park’s exact earthwork solution fits another site.
- Inventory what can remain or be reused. Existing trees, factory buildings and demolition concrete were incorporated into the project account. A careful site inventory can identify assets before clearance decisions are made, though the extent of reuse and its savings need project-specific documentation.
- State performance metrics precisely. Retention capacity, lake storage and daily water treatment are distinct quantities. Project teams should identify the system, time basis, source and whether a figure is expected, designed or measured.
- Design for more than one public benefit. The park’s stated aims include water regulation, runoff treatment, habitat, recreation and cultural use. A multifunctional brief can help explain why the landscape includes both ecological systems and visitor routes.
- Separate design intent from operational evidence. A planting plan intended to need limited maintenance is not proof of actual maintenance performance. Long-term claims require monitoring information that is not supplied in the project summaries cited here.
The construction story is thus not simply “factory site becomes park.” It is a change in how the site’s ground, water and existing assets are organized. Its strongest documented lessons are about integrating earthwork and material reuse with a broader landscape plan, while being careful not to overstate results that the available sources do not measure.
What the project demonstrates—and what it does not
Benjakitti Forest Park demonstrates that a former, heavily paved industrial site can be reworked as a public landscape that combines wetlands, planted ground, reused structures and recreation. The project descriptions make a credible case for an integrated design strategy, supported by explicit accounts of cut-and-fill, tree preservation and recycled concrete.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesThey do not, on their own, establish a long-term flood-reduction percentage, a common reconciliation of published water-capacity figures, or quantified carbon and waste savings. Reading the project accurately means holding both points together: it is a substantial brownfield transformation with multiple intended functions, and its reported capacities and ecological outcomes must remain attached to their specific sources and definitions.
Frequently Asked Questions
Who commissioned Benjakitti Forest Park?
The ASLA award entry names Thailand’s Ministry of Finance as the client and credits Turenscape and Arsomsilp as the design team. The Cultural Landscape Foundation also associates the project with those firms.
What rainfall context did the project account cite?
ASLA’s 2024 project entry gives about 1,500 millimetres as average annual precipitation for the regional context. That is rainfall context, not a measured amount captured by the park.
How many bird species are reported at Benjakitti Forest Park?
An IUCN report published in 2025 gives 91 bird species in its park summary. It should be read as a figure attributed to that report, not as a live or independently verified census.
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