In the year 2030, the Bangkok Metropolitan Administration (BMA) sets a goal to increase green space per capita to 10 square meters per person. This means, in the future, Bangkok will become a green, environmentally friendly, and livable city where its people are healthy. Green Bangkok 2030 Project is one of the major projects of the BMA to drive forward its policy to increase green spaces to make Bangkok a Green City without using miracle but only with kind cooperation from the people of Bangkok.
In order to create sustainability in the implementation of the project, the BMA has invited, supported, and promoted all sectors to increase green spaces. This includes the use of the BMA master city plan in enforcing construction areas to create green areas using empty and vacant spaces and to plant trees along the roads, on footpath, on traffic islands, and in public areas.
In this regard, the BMA has set up rules for the consideration of tree planting on the roads that have traffic islands. It aims to create the feeling of nature that permeates in urban environments. For example, on traffic islands that are more than 3 meter wide, grass shall be laid and flowering plants, ornamental plants or perennial plants shall be planted. On traffic islands of about 2 – 3 meter wide, small-sized perennial plants, shrubs, and ornamental plants shall be planted. On traffic islands that are 1 – 1.99 meter wide, grass shall be laid and/or ornamental plants that can be trimmed shall be planted. For traffic islands that are less than 1 meter wide, flooring shall be installed.
The rules for tree planting along the roads that have footpaths are also in place. For example, footpaths of 3 meter wide without awning shall have perennial plants planted; footpaths of more than 4 meter wide with awning shall have medium-sized perennial plants planted; footpaths of about 3 – 4 meter wide with awning shall consider planting shrubs; and footpaths of less than 3 meter wide shall consider laying floorings and/or creating trellises for climbing plants or vines as deemed appropriate.
There is also the consideration and selection of plant species that are appropriate for environment and locations. In case of trees along the roads or footpaths, it is suggested to consider trees with the medium height (5 – 15 meters) that do not need much pruning and trimming, has a strong root system, and has capacity in absorbing pollutions and trapping dust. In addition, area size and the depth of underground conduits should be considered because it relates to the depth of tree roots that will grow down under the ground. In some areas, there might be the need to select and plant only ornamental plants or shrubs instead of big trees to prevent and avoid impacts against the communication cable conduit system.