Government of India 
Frequently asked questions (FAQ) pertinent to Teesta Basin Organisation
Question 1: What is the jurisdiction of Teesta Basin Organisation (TBO), CWC, Kolkata?
Answer: The jurisdiction of TBO is Sikkim, West Bengal and partly Assam as per network of hydro-meteorological sites. State-wise distribution of above network is as under:
(As on 30.07.19)
#
Name of State
Gauge
Gauge & Discharge
GDS
Water Quality
Rainfall/ Snow
Flood Forecast
Inflow Forecast
1.
Sikkim
22
4
13
24
55
9
5
2.
West Bengal
13
6
9
30
15
2
3.
Assam
1
1
2
Total
35
11
23
56
70
11
5
* The data collection network is periodically reviewed and modified as per changing requirements.
So far as the appraisal and monitoring of water resources projects is concerned, the jurisdiction is Sikkim and West Bengal. International cooperation in sharing of data with Bhutan and Bangladesh is also handled by TBO.
Question 2: What type of hydro-meteorological data is collected/ observed by CWC?
Answer: The hydro-meteorological data collected/observed by CWC are as under:
- River Water Level (Gauge, G)
- River Discharge (Discharge, D)
- Sediment Flow (Silt, S)
- River Water Quality (Quality, Q)
- Rainfall
- River Temperature
- Ambient temperature
Besides the above, TBO also observes other hydro-meteorological parameters such as rainfall (RF), maximum-minimum temperature (MMT) at some selected site.
Question 3: What is the frequency of hydro-meteorological data collection observation in CWC?
Answer: The general hydro-meteorological data collection/observation frequency is as under:
- River Water Level (Gauge, G) (monsoon)
: Hourly (24 x 7)
- River Water Level (Gauge, G)
(non-monsoon)
: Daily at 8:00, 13:00 & 18:00 hrs
- River Discharge (Discharge, D)
: Daily
- Sediment Flow (Silt, S)
: Daily
- River Water Quality (Quality, Q)
: Ten-daily/monthly
- X-Sections of rivers
: Pre-monsoon and post monsoon
- Meteorological data
- Rainfall (Ordinary Raingauge)
- Rainfall (Tipping bucket)
: Daily/hourly
: Daily (Frequency increases in case of heavy rainfall)
:Hourly
Question 4: What is the classification of hydro-meteorological data collected/ observed by CWC?
Answer: From the point of data dissemination, the country has been divided in to three regions:
- Region-I :
Indus basin & other rivers and their tributaries discharging into Pakistan
- Region-II :
Ganga-Brahmaputra-Meghna basin & other rivers and their tributaries discharging into Bangladesh/Myanmar; and
- Region-III:
Remaining other rivers and their tributaries.
Question 5: What type of hydro-meteorological data is collected/ observed under TBO as per data dissemination policy?
Answer: The hydro-meteorological data collected/observed under TBO are as classified under Region-II and is therefore disseminated under secrecy undertaking and approved by a Classified Data Release Committee.
Question 6: What are the river basins under the jurisdiction of TBO, Kolkata?
Answer: Teesta River along with other sub-basins of Brahmaputra, such as Jaldhaka, Torsa, Raidak & Sankosh and upper Mahananda sub-basin of Ganga is the basin boundary of TBO so far as Hydrological and meteorological network is concerned. Sub-basin-wise details of the sites are as under:
#
Name of Sub-basin
Gauge
Gauge & Discharge
GDS
Water Quality
Rainfall/ Snow
Flood Forecast
Inflow Forecast
1.
Teesta
29
6
14
36
57
5
5
2.
Jaldhaka
3
2
5
5
2
3.
Torsa
1
2
2
5
2
2
4.
Sankosh & Raidak
2
3
2
7
5
2
5.
Mahananda
3
3
1
Total
35
11
23
56
70
11
5
Question 7: What is the catchment area of Teesta River and its distribution in different states in India and beyond?
Answer:
Question 8: Whether Teesta basin data is freely available?
Answer: Teesta basin being part of Brahmaputra basin and upper Mahananda sub-basin of Ganga basin falls under region-II as per Hydro-meteorological Data Dissemination Policy, 2018. Cost of data per year or a part of a year is released at the rate of Rs.75,000/- to Indian commercial user or foreign user subject to approval of Classified Data Release Committee on secrecy undertaking of the user as per Classified Data Dissemination Policy, 2018.
Similarly, in case of Indian non-commercial users, data is disseminated free of cost subject to approval of Classified Data Release Committee on secrecy undertaking.
Question 9: What are the flood forecasting sites under TBO?
Answer: There are 11 flood forecasting sites and 5 inflow forecast sites under TBO as under:
#
Name of Station
State
River
Nearest Town/City
Water Level Forecasting site
1.
Singtam
Sikkim
Teesta
Singtam
2.
Melli
Sikkim
Teesta
Mellibazar
3.
Jorethang
Sikkim
Rangit
Jorethang
4.
Ghughumari
West Bengal
Torsa
Ghugumari
5.
Tufanganj
West Bengal
Raidak-I
Tufanganj
6.
Golokganj
Assam
Sankosh
Golokganj
7.
Hasimara
West Bengal
Torsa
Hasimara
8.
Domohani
West Bengal
Teesta
Domohani Bazar
9.
Mathabhanga
West Bengal
Jaldhaka
Mathabhanga
10.
NH-31
West Bengal
Jaldhaka
Dhupguri
11.
Mekhliganj
West Bengal
Teesta
Mekhliganj Bazar
Inflow Forecasting site
1.
Teesta 3 Dam
Sikkim
Teesta
2.
Teesta 5 Dam
Sikkim
Teesta
3.
Rongli Dam
Sikkim
Rongli
4.
Rangpo Dam
Sikkim
Rangpo
5.
Rangit 3 Dam
Sikkim
Rangit
CWC Flood Forecast may be seen at http://ffs.tamcnhp.com/ffs and 3 Day Advisory Flood Forecast on real time basis may be seen at https://120.57.32.251/.
Question 10: What is the contribution of TBO in survey and investigation in Sikkim?
Answer: The Investigation Circle and Division Office are functioning much before the start of TBO who have successfully completed the Survey and Investigation works and preparation of Detailed Project Report of major hydropower projects in Sikkim which are as under:
#
Name of Project (River/Stream)
Installed Capacity (MW)
Remarks
1.
Lower Lagyup HE Projects, East Sikkim (RoroChu, YaliChu & TakchonChu)
12
Investigated and constructed and in operation
2.
Jali HEP, East Sikkim (RongniChu)
1
3.
Teesta HEP, Stage-II, North Sikkim (Teesta)
3x110
DPR submitted in September, 2003.
4.
Teesta HEP, Stage-III, North Sikkim (Teesta)
6x200
DPR submitted in 1987. In operation.
5.
Teesta HEP, Stage-IV, North Sikkim (Teesta)
495
DPR submitted in Aug. 1995. Under construction
6.
Teesta HEP, Stage-V, North Sikkim (Teesta)
510
DPR submitted in Mar, 1995. In operation.
7.
Teesta HEP, Stage-VI, North Sikkim (Teesta)
4x90
DPR submitted in Mar, 1999.
8.
Rangit HEP, Stage-III, West Sikkim (Rangit)
3x20
DPR submitted in 1979. In operation.
9.
Rangit HEP, Stage-IV, West Sikkim (Rangit)
3x40
DPR submitted in Aug., 2005. Under construction.
