Development is inevitable and must be accommodated. However, uncontrolled growth is destructive. Any development, which does not address the environmental factors of the region, will lead to degradation and destruction. Conservation principles can avert destruction and ensure enhancement.
Conservation principles are adopted in the form of the Environmental Enhancement Zones in the Structure Plan for Thimphu, to protect and conserve the identified ecologically fragile areas. The proposed Environmental Enhancement Zones are classified into:
1. Riparian Protection Zone
2. Flora, Fauna And Avifauna Protection Zone
3. Slope and Soil Stabilization Zone
4.2.1 THE RIPARIAN PROTECTION ZONE
The land and the ecosystem supported by the river, streams, rivulets and their immediate surroundings form the Riparian Zone. The ecosystem supported by the Wang Chhu, streams, and rivulets includes the existing natural watercourses, banks of the watercourses, flora and fauna habitats supported by them, terraces and marshlands associated with the watercourses. This ecosystem plays a significant role in protecting the edges and banks of the watercourses and also helps in filtering and purifying the water of the river and streams.
The objective of this proposed zone is to protect and conserve the ecology
of the Riparian Zone, to control pollution along the river, streams and rivulets
and to establish a greenbelt within the valley along the watercourses. The Riparian
Protection Zone is to be classified into:
a) River and Stream Side Protection Zone
b) Ground Water Protection and Management Zone
4.2.1.1 RIVER AND STREAM SIDE PROTECTION ZONE
The Proposed River Side Protection Zone includes, the Wang Chhu, all streams
and rivulets within the Municipal Corporation boundary. The banks of rivers
and streams are physically supported by a soil and biomass ecology which extends
far back from the water’s edge. Construction even twenty - five meters
from the edge can initiate a process leading to vast erosion and river bank
collapse. There are two different widths proposed to define the zone along the
watercourses, which is in relation to the hierarchy and the environmental importance
of the watercourses.
a. The zone defined for the Wang Chhu, and major streams, includes the natural
watercourse and its immediate surroundings within a minimum distance of thirty
meters from the banks, or edge, of the watercourse. The major streams include
the Ngabe Rong Chhu, Ola Rong Chhu, Chhubar Chhu including its three major tributaries,
Samteling Chhu or Silikha Chhu, two streams of Taba, the stream north of the
Dechencholing Palace and the Dechencholing Stream.
b. The zone defined for minor streams and rivulets includes the watercourses and their immediate surroundings within a minimum distance of fifteen meters from the edge of the watercourse.
c. The minimum width of thirty meters for the river and major streams is based on the “Forest and Conservation Act, 1995”, which reads as, “No permit shall be issued to fell and take any timber within hundred feet of the bank or edge of any river, stream, watercourse or water source.” The objective of the Act is to protect the environment of the streams and the river. Unfortunately, this Act is not respected within the urban areas. Implementing this Act within urban areas, as a part of the River and Stream Side Protection Zone, will help to protect the environment of the watercourses and also minimize the pollution level of the water.
Proposed Actions for River and Stream Side Protection Zone
The proposed River and Stream Side Protection Zone is a part the Environment
Conservation Precinct under the Proposed Precinct Plan. The proposed actions
for this zone are:
• No development or construction shall be permitted within thirty meters
of the edge of the watercourse, or the edge of the gullies of the Wang Chhu,
and major streams, or such distance as may be prescribed under any other general
or specific orders of the Royal Government, or any other competent authority.
• No development or building construction shall be permitted within fifteen
meters of the edge of all natural rivulets and natural drainage channels, or
such distance, as may be prescribed under any other general or specific orders
of the Royal Government, or any other competent authority.
• Natural landscape features of the river, major streams and rivulets,
which include the natural course of water, banks or edges, soil, vegetation
(trees, shrubs and ground covers), rocky outcrops, boulders and any feature,
or element, which is part of the ecosystem, or which is considered to be of
scenic value may not be damaged or disturbed from its natural state of being.
• Construction of roads, laying of underground cables and other service
networks, other structures like high - tension cable pylons, transmission towers
and installations of electric substations shall not be permitted within the
thirty meters zone of the river and major streams, and within the fifteen meters
zone of the rivulets.
• Dumping of solid wastes, disposal of domestic wastewater and sewage,
washing of automobiles, or any other action considered as a cause of polluting
this zone will not be permitted.
• Existing structures within this zone can be retained, but their further
development shall not be allowed and subsequent development should get clearance
from the National Environment Commission.
• Existing land use, which is considered not to cause any impact on the
ecosystem, can be retained after a detailed assessment by the National Environment
Commission, and their no - objection certification.
Guidelines and Permitted Actions
• Footpaths and cycle tracks, vehicular bridges, footbridges, vegetable
and flower gardens, nurseries, landscape elements like lamp posts, benches,
gazebos, children’s play equipment and litter bins, shall be permitted
only beyond fifteen meters of the edge of the Wang Chhu and major streams.
• Footpaths shall be permitted along the boundary of fifteen meters wide
protection zone of the rivulets.
• The location and layout for the above - mentioned developments be endorsed
by the National Environment Commission and Nature Conservation Division (MoA).
• Actions related to protection, conservation and enhancement of the zone
will be permitted under the guidance of the National Environment Commission
and the Nature Conservation Division (MoA).
• Edge/Bank protection works for river and major streams shall be permitted
with the clearance from the National Environment Commission and Nature Conservation
Division (MoA).
• Certain stretches of the zone, which are not ecologically sensitive,
shall be permitted to have recreational open spaces like parks, sports facilities
and riverfronts, with the approval form National Environment Commission and
Nature Conservation Division (MoA).
• The Wang Chhu, streams and rivulets and their protection zones can be
adopted and maintained by any institution or organization in the immediate surroundings
of the zone.
Proposed Stream Water Purification Ponds
The natural streams within Municipal Corporation limits, which are the tributaries of the Wang Chhu, are heavily polluted due to disposal of domestic waste water and solid waste. The proposed stream water purification ponds will filter and purify the organic and suspended particles carried by these urbanized streams before joining the river. These purification ponds will be natural water retention ponds located at the confluence of streams and the river. These ponds will have water plants and micro - organisms, which purify the water. These ponds will also act as a recreational feature along the riverside green belt.
4.2.1.2 GROUND WATER PROTECTION AND MANAGEMENT ZONE
The objective of this zone is to protect, conserve and manage the potential ground water resources and flood plains within the valley and also to prevent development on flood prone areas. The extent of land demarcated and defined by the Department of Geology and Mines as Lower River Terraces is defined as the Ground Water Protection and Management Zone. Areas to be identified as ground water aquifers or ground water recharge sites in the future would also be categorized under this zone.
Proposed Actions and Guidelines for Ground Water Protection and Management
Zones:
• The proposed Ground Water Protection and Management zone will be part
of the proposed Green Space System and National Open Space System as per Proposed
Precinct Plan.
• Agriculture, floriculture and horticulture are the best suitable land
uses for the zone.
• Existing vegetation cover, which is indigenous to the area, should be
retained.
• Construction of buildings and hard paving of ground surfaces shall not
be permitted.
• The zone will be developed as parks, nurseries or gardens without disturbing
the characteristics of the soil and subsurface geology of the area.
• Parks, nurseries and gardens shall be permitted with minimum basic structures.
The layout of the proposed park, location, ground coverage, construction material,
technology and process of construction of the structures related to the parks
should obtain approval and clearance from the National Environment Commission,
and the Nature Conservation Division (MoA).
• Out - door sports activities which do not require hard paved surfaces
and built structures shall be permitted after approval by the National Environment
Commission.
4.2.2 FLORA, FAUNA AND AVIFAUNA PROTECTION ZONES
Areas demarcated as forests, reserved forests, areas rich in biodiversity, wildlife habitats and corridors, habitats and corridors of migratory birds and endangered species, and marshlands within the Municipal Corporation boundary will come under flora, fauna and avifauna protection zones. The objective of creating this zone is to protect and conserve the forest wealth, bio - diversity and the habitats of migratory birds within the valley, and also to maintain the greenery of the valley.
The proposed flora, fauna and avifauna protection zone is classified into
a. Bird Habitat and Marshlands Conservation Zone
b. Proposed Forest Environment Precinct
4.2.2.1 BIRD HABITAT AND MARSHLANDS CONSERVATION ZONE
This zone includes all marshlands which are of environmental importance and
areas which act as habitats for migratory birds. The following locations are
identified as Bird Habitat and Marshlands Conservation Zone:
• The marshland (in Babesa) south of sewage treatment plant and its surrounding
land up to the existing road, east of the marshland.
• The marshlands along the banks of the river and the islands near Langjophaka
• The existing protected area within the Center for Bhutan Studies campus.
• The marshlands along the banks of the river near Taba.
Proposed Actions and Guidelines for Bird Habitat and Marshlands Conservation
Zone:
This zone is defined as a part of the Environment Conservation Precinct as per
Proposed Precinct Plan.
• Any action/development/construction that will cause disturbance or damage
to the habitats and their environment shall not be permitted.
• The existing landform, landscape and natural features should be protected
and should be enhanced if necessary.
• Activities like bird watching shall be permitted. Related field experts
from the Nature Conservation Division in consultation with other related Non
Governmental Organizations, would prepare the norms for conservation of these
lands and bird watching.
• These lands can be directly under the control and monitoring of the
Nature Conservation Division, or the National Environment Commission, and can
be maintained or adopted by institutions related to environmental research and
education.
4.2.2.2 PROPOSED FOREST ENVIRONMENT PRECINCT
The proposed forest environments aim at protecting the existing forest cover within the Municipal Corporation boundary, which is at the mercy of urban development. All coniferous, broad leaf and mixed forests within the present Municipal Corporation boundary, demarcated as forests by the Department of Forestry Services, before the extension of city limits in 1999, will be declared as Forest Environment Precinct. Protecting these forests would protect the mountain slopes, wildlife habitats and would also enhance the greenery of the city.
Proposed Actions and Guidelines for Proposed Forest Environment Precinct
• This zone is defined as Forest Environments under the Proposed Precinct
Plan.
• The "Forest and Conservation Act 1995,” that is applicable
for forest areas will be strictly followed for the forests within the Municipal
Corporation limits, to protect the forest from urban development.
• All the forest areas will not be opened for grazing. Only identified
areas will be allowed for grazing.
• Wildlife corridors and habitats are located at the periphery of the
city and the guidelines for protecting these areas shall be framed by the Nature
Conservation Division (MoA).
• Areas identified for densification of forest cover and afforestation
should be planted with plants of indigenous species, as directed by the Forest
Department.
• No access road or any service installation to service private lots will
be permitted through this zone.
4.2.3 SLOPE AND SOIL STABILIZATION ZONES
The objective of the slope and soil stabilization zone is to protect and stabilize the slopes from soil erosion and landslides and to reduce the surface runoff of the area. Areas under Very Steep Slope category (above 30% slopes) and Steep Slope category (20 - 30%) other than forest environments, which are barren and prone to landslides and soil erosion, are defined as Slope and Soil Stabilizations Zones. The barren slopes above (east of) Babesa - Simtokha road and the Lungtenphu - Simtokha road, slopes of Yangchenphug, some parts of Zilukha and Dechenphodrang, and slopes above (west of) the Jongshina - Dechencholing Palace Road, are the areas within the Municipal Corporation boundary, which fall under this zone.
Proposed Actions and Guidelines for Slope and Soil Stabilization Zones
This zone will be defined as Agri - Based Environment Precinct, under the Proposed
Precinct Plan, since most of these lands are currently occupied by apple orchards
and have development control regulations similar to the agriculture precincts.
• Areas under Very Steep Slopes category (above 30% slopes), which does
not have any existing road and infrastructure networks will be prohibited for
development and shall be planted for forest cover.
• Areas under Very Steep Slope category (above 30% slopes) and Steep Slope
category (20% - 30%) that are barren and have already been provided with roads
and other infrastructure networks will be temporarily prohibited to development
and shall be planted with trees, shrubs and, ground covers of indigenous species.
When the slopes are stabilized and covered with the appropriate distribution
of mixed hardwoods to an average height of ten meters, they may be considered
as below.
• The development on the Steep Slopes and Very Steep Slopes with existing
road and infrastructure networks, with appropriate vegetative cover must be
developed in such a manner so as to perpetuate their existing wooded aspect.
The maximum density permitted for development will be one house per one thousand
square meters of land. The most suitable land uses for these areas are large
institutional campuses, eco - resorts and farmhouses.
• All the above - mentioned development shall be permitted after detailed
analysis of the soil and geology of the area with approval from the National
Environment Commission.
• The development should not alter the existing natural surface drainage
pattern and care should be taken to control the surface runoff. Development
on these slopes should have well planned and designed storm water drainage networks.
4.2.4 PROPOSED WATERSHED MANAGEMENT ZONES
The slopes define the Watershed Management Zone of a stream, or a river, and drainage networks which contributes to the stream or the river. The watershed region also includes the source and catchment areas of the water bodies. Most of the streams and Wang Chhu have their watershed area outside the Municipal Corporation boundary. The aim of the proposed Watershed Management Zones is to protect the environment of the natural drainage network and other natural sources of the river and the streams, which include the slopes, vegetation, soil and the ecology of the watershed area.
Proposed Actions and Guidelines for Watershed Management Zones
The primary requirement for protecting these watersheds is their detailed study
and mapping to demarcate the areas.
• Development on slopes, which are part of the watershed area, shall be
permitted after detailed study and analysis of soil, geology, surface runoff
and vegetation of the area.
• The vegetative cover in the watershed region should be protected and
intensified if necessary, with indigenous plants thus preventing the surface
runoff and soil erosion.
• The natural drainage pattern, rivulets, and gullies in this zone should
be protected and maintained.
• Grazing on the slopes, associated to the watershed area, should be restricted.
MAP
NO. 4.2 PROPOSED ENVIRONMENTAL ENHANCEMENT ZONES (Click to view the maps)
TABLE 4.3: Project List for Environmental Enhancement Zones