Allocation as per the Urban Village Precinct characteristics
As per the envisaged growth structure for the city, each Urban Village would consist of a Neighborhood Node, which would contain the Core commercial, and amenities, an Urban Village Core area, which would be containing all the high - density housing areas and the Urban Village Periphery, which would be having a lower density of residential use (and other permitted uses as per the Land Use and Zoning Plan).
Considering this framework of each Urban Village area, it is proposed that the Neighborhood Node and the Urban Village Core areas, be equipped with a Storage Reservoir, to enable a pressure driven Water Supply System in these areas. The Water Supply network in these areas would be run and maintained by the pumping station provided in each Node.
As these areas carry higher densities of residential use, retail commerce and amenities for the Urban Village area, the basic provision of firefighting facilities in the form of “Fire - Hydrants” could also be done if the network pressure is constantly maintained.
Networks based on gravity – flow mechanisms, would service the Urban Village Periphery areas. A network of trunk infrastructure would have to be laid out covering the key areas of the Urban Village Periphery, from which branch lines would be let out as and when required.
So essentially, the trunk infrastructure leading from the main reservoir to the Neighborhood Node, the Urban Village Core, and the Urban Village Periphery areas would have to be established separately.
The billing would also differ as per the declared use of the plot.
The Neighborhood Node, and the Urban Village Core areas could be differentially priced from the Urban Village Periphery areas owing to the grade of service provided being different. So, as per the above recommendations for instance, an institutional campus if established in the Urban Village Core area would be differentially priced from one, established in the Urban Village Periphery zone. The billing would be as per the metered consumption levels of each plot or registered units, as in the case of shops and apartments in the Neighborhood Node.
Actual network planning for the Neighborhood Node, the Urban Core and the Urban Village Periphery areas, as per the different systems of supply proposed would have to be worked out in detail separately.
4.10.2.6 PROPOSED WATER SUPPLY SYSTEM
Networks and Sources
These observations on the local situation lead us to propose a two - tiered system of water supply as follows:
Central Network
The Central network would primarily consist of the two main sources i.e. the Motithang source, the Samteling source and the respective treatment plants, with a combined capacity of 15,000cum/d. There would be no minor or subsidiary sources feeding into the Central network (with the exception of tapping the Wang Chhu to act as a back - up source for future requirements). All the processing of water for the Central network would be done utilizing the combined capacities of the Main treatment plant at Motithang and the Samteling treatment plant (after its up - gradation to 8500 Cum/d capacity) only.
This network would only be covering the areas within the city, which can be easily accessed (both in terms of horizontal distance and terrain) from the two outlined sources.
So this network would primarily be serving the areas of Motithang, the Core area of Thimphu, Changzamtog, Chang Bangdu, Yangchenphug, Hejo, Samteling, The Dzong area, The National Assembly area and the Langjophaka area.
The Samteling treatment plant currently being established with a capacity of 8,500cum/d would be put into use to serve the Core area of Thimphu besides serving the Dzong area, Hejo, Samteling, the National Assembly campus and the Langjophaka area.
The Motithang source would have to be put into use to serve the areas of Motithang, Changzamtog, Chang Bangdu and Chang Jiji (temporarily, till the Lungtenphu Local Network is activated). A branch line from this network could be extended along the expressway to the Chang Jiji Neighborhood Node, Lungtenphu Neighborhood Node, and the Simtokha Urban Hub to act as a back - up supply whenever required (this would have to be supported with appropriate storage and pumping facilities wherever required).
As in the case of Babesa and Simtokha, a branch line from Jongshina trunk line could be extended to Dechencholing node to facilitate a back - up supply till the Wang Chhu is activated, the same trunk line could be utilized later, to connect the Central network to the Wang Chhu source.
The Central Network would be serving a combined population of 43,653 from the afore mentioned Urban Village areas, addressing a potential demand of 6548 Cum/d at the rate of 150 Lts/capita/d.
The population that can be ideally accommodated in the areas outlined for
Local networks is 64150, indicating an anticipated demand of 9622.5 Cum/d
(at the rate of 150 Liters/cap/d). The
Note:Please click on the following link to view
the map.
MAP
NO. 4.13 PROPOSED WATER SUPPLY SYSTEM AND NETWORK CATEGORIES
MAP
NO. 4.14 PROPOSED WATER SUPPLY ZONES AND NETWORK CATEGORIES