FORM-'A'
FCi'm for seeking prior approval under section 2 of the proposals by: the State Governments .and other authorities
PART-I (to be filled up by user agency)
1 , Project details i. Short narrative of the proposal
and project/scheme for which the forest land is required
To explore the hydro-potential of River Tawang Chu, Govt. of Arunachal Pradesh entrusted the development of hydroelectric projects in Tawang basin to NHPC for survey and investigation and preparation of PFR I DPR.
The development envisaged utilization of water of Riv0f Tawahg Chu, formed by joining of two rivers - Mago Chu and Nyukcharong Chu. River Tawang Chu cruises i;;)Qut 45 km in India and just after the conflu<ll1ce 'Nith Nyamjang Chu, it enters Bhutan whare it ~;onf1u",n,)es
with River Manas,
Based on available topographical, geologic<:Il ?lnd hydp)­ meteorological data, it was envisaged the! ihe entire hydropower potential of Tawang Chu b3tween Nuranang Chu Power House and Bhutan border can be harnessed by contemplating two schemes viz" Tawang HE Project Stage I and Tawang HE Project Stage II in a cascade manner, Based on preliminary investigations a Preliminary Feasibility Report (PFR) of these projects in T awang basin was preparsd for preparation of Detailed Project Report (DPR) and development of hydropower potential of this basin,
On establishment of the feasibility of the projects GO'I!. of Arunachal Pradesh entrusted implementation of Tawang HE Project Stage I and Tawang HE Project Stage II to NHPC by signing Memorandum of Agreement (MoA) on 21.09.2006. Revised MoA was again signed between NHPC and Gov!. of Arunachal Pradesh on 24.06.2007 for execution of these projects.
After detailed survey and investigation, OPR of Tawang HE Project Stage II (800 MW) was prepared, Tawang HE Project Stage II is a run of the river s ~heme and envisag~s construction of 28 m high ReC Raft Barrage across Tawang Chu at Yusum I Kudung and Khet villages of Tawang District (15 km downstream of forebridge near Jang), diverting the water through 15.989 km long and 9 m diameter horseshoe shaped Head Race Tunnel for generation of 800 MW (4 x 200 MW) of power by utilizing gross head of 494 m and constructing an underground Power House on right bank of River Tawang Chu at village Kungba and about 300 m w/s of confluence of Tawang Chu with Nyamjang Chu near Bhutan Border, The water from turbines shall be discharged back to river through one 170 m long and 9 m diameter horseshoe shaped tail race tunnel. Area under submergence at FRL
will be 6.19 ha.
&
Salient features of the project are enclosed as Annex'A'.
ii. Map showing the required forest land, boundary of adjoining forest on a 1 :50,000 scale map
Map placed as Annex 'B'.
iii. Cost of the project The project is estimated to cost Rs. 6247.99 crores including IDC cost of Rs. 1382.81 crores and financing charges Rs. 32.80 at June 2009 price level.
iv. Justification for locating project in forest area
the Power is the most important and essential input for economic development of state and country. Hydropower is essentially required for quality power i.e. for the grid stability. The greatest merit of hydropower is its suitability, durability, variability and economic viability. Tawang H.E. Project Stage II is one of the two projects for harnessing hydropower potential of Tawang Chu river in a cascade manner. The necessity for development of Tawang H.E. Project Stage II to contribute for the economic and social development of Arunacahal Pradesh has been well acknowledged by Govt. of Arunachal Pradesh.
Location of the project Barrage and other components have been finalized after investigating various alternatives. The present site chosen for the barrage suits more as the river in this particular reach is quite flat and sufficient river width is available to pass the design flood. The geological investigation reveals that there is an overburden of the tune of 25-30 m in the river bed and nearly 5-10 m in the left bank whereas on the right bank the rock is expected at 20-25 m below the ground level. Only 62 families are likely to be affected due to land acquisition required for the construction of Tawang H.E. Project Stage II. The project· has been found commercially viable and generation from the project shall mitigate the miseries of power-starved industry and people in the eastern and north-eastern states of India.
v.
vi.
Cost-benefit analysis placed as Annex 'C'.
The execution of Tawang H.E. Project Stage II wiU accelerate economic activities in the area, resulting creation of job opportunities for the benefits of local inhabitants as well as outside traders for around 43,80,000 man days.
'-"~';""i<' trnlilT~ " ,-.... ,NHPC Ud I ...,.,. mo~,(>T\"'O .
·;T~O\l''-'''o. ' it t +;-;,.';;"" ~~ ~/Neh!uNlal c. ;M<' ·... r,~'-q\t:t"'~.. } . .\Ptad~~h,' .. } '; :v'l",,~ 1:f;W I Alunacha, ..
Tawang H.E. Project Stage-II (800 MW)
lo{ '.tion-wise requirement of land for the proposed roads
SI.No. Proposed roads Location , Length width Area Area
(m) (m) (sq. m) (Ha) " (I) Sakyur 1700.00 15 25500.00 . 2.55
1 Stage-II Barrage Complex to MDA-2 (Ii) Thrillam 442.00 15 6630.00 0.66
2 MDA-2 to MDA-3 (I) Thrillam 1178.60 15 17679.00 1.77
i (ii) Bulkyung 857.16 15 12857.40 1.29
3 MDA-3 to mangnam Nala for Adit-III
i and TWII-G4 Bulkyung 1135.74 15 17036.10 1.70 i 4 Mangnam nalato Adlt-III Mangnam 3214.00 15 48210,00 4.82
i
5 Mangnam nala to TWII-G4 (i) Mangnam 1821.47 15 27322.05 2,73
(ii) Hoongla 642.87 15 9643,05 0,96
6 TWII-G4 to Hoongla nala Hoongla 700.00 15 10500.00 1.05
7 Hoongia nala to Adlt-IV Hoongla 720.00 15 10800.00 1,08
8 Hoongla nala to MDA-4 Poito 1450.00 15 21750.00 2.18
9 MDA-4 to MDA-S (I) Polto 580.00 15 8700.00 0.87
(ii) Dugumba 400.00 15 6000.00 0.60
10 M DA-5 to Stage-II PH Complex (i) Saw 2035.76 15 30536.40 3.05
(Ii) Kungba 1285.74 15 19286.10 1.93
11 Kungba road to Adit IV CFA Kungba 300,00 15 4500.00 0.45
12 Thrillam to Main Office and Colony Site Thrillam 1800,00 15 27000.00 2.70
Total;' 20263.34 303950.10 30.40
Length of the roads is based on the map submitted to Forest Dept!.
3, Details of displacement of people due to the project, if any
i. Number of families
Casles I
4. Whether clearance under Environment (Protection) Act, required? (Yes/No)
1986
5.
6,
Undertaking to bear the cost of raising and maintenance of compensatory afforestation and/or penal compensatory afforestation as well as cost for protection and regeneration of Safety Zone, etc, as per the scheme prepared by the State Government (undertaking to be enclosed) Details of Certificates/documents enclosed as required under the instructions
No family will be displaced due to the project. However, about 62 families are likely to be affected due to land acquisition required land for the construction of Tawang H.E. Project Stage-II,
All the families belong to Scheduled tribe.
R & R Plan enclosed as Annex '0'
Yes
Undertaking attached as Annex 'E' & 'F'
Annex 'A' - Salient features of project Annex '8' - A map on 1 :50000 Annex 'c' - Cost·benefit analysis Annex '0' - R & R Plan Annex 'E' - Certificate of Undertaking for
compensatory afforestation. Annex 'F' - Certificate of Undertaking for NPV
Signature
_ .~ NHPC Ltd" Nehru Market, ~~I",liljilr~ l!f.!lr'i1iI..m;J' .eg~in~roj.cIPO & Distl, Tawang -790 104. [r"loTJtfQ't)O~;ot1;J INNPCL tel. (Arunachal Pradesh) ~
, , . Date: ~~ t~~. ,;.'rern lil1f"rut'IQ(lrK,e1. r~'N;)t~f Place:
1p',Jrrf,,'rq 1J79l': ~( J~~(:i l:';~ Pfd:t\(,tr:~\f.. i U1t.
State serial Klo. of proposal 9JJ1 Fa IS/fIll (To be filled up by tl1e Nodal Officer with da! of (eceipt)
Tawang H.E. Project Stage II
TAWANG H.E. PROJECT STAGE-II (800 MW)
SALIENT FEATURES
2.1 LOCATION
I:t River Tawang Chu
I:t Barrage Site Yusum Village. (15 km dIs of Forebridge near Jang)
II Nearest BG rail head Guwahati &Nagaqn
II Nearest airport Guwahati &Tezpur
I:t Latitude 27°32'48"
I:t Longitude 91°49'57"
" Rainfed area 2535 sq.km.
I:t Location of catchment
o Longitude 91°47'30" to 92°27'00"
I:t Average annual rainfall (at Yusum) 2665 mm
II Maximum temperature 31.1 ·C
I:t Minimum temperature -2.9°C
II Max 10 daily discharge 344.3 cumee
II Min 10 daily discharge 38.2 cumec
~~ (£><'»
~~, 1'imrr/Nehn,i.';, ;,ang ~I<>UJi'tlM tRw!Arunachal Pr.d~~iI·79()1 04
- '" ":c.'. ",.. ~ '.,'", ,ri­
II Min. Draw Down level (MDDL)
II Gross storage
a at FRL
o at MDDL
2.4 DIVERSION TUNNEL
a DT Inlet gate
II Upstream Floor Level
a Upstream Floor Thickness
II Thickness of Pier
EL 1536m
EL 1505.5 m
n Height . 28 m ,k ..aw--~
2 .' .-~) iIlW iIf~ tlftmurnr~/lawang Basi" Pr~j.ct. l.l;'I'01:[c:r"tftomol('!'o INHPC Ltd. ~' 1::ff1~7., o'mrrINchru Mmkfii' l':mJ!l!nl't
Tawang H.E. Project Stage- II
2.6 SPILLWAY • l::t Design,flood 13300 cumec
l::t Type Orifice
o Number (including one 8 emergency bay)
.0 Size (Wx H) 10 x 14.75 m l::t Energy dissipation Stilling Basin with End sill
2.7 INTAKE
II Number 2
II Size of Gate opening 6.5 x 6.5 m each
'" Trash Rack Inclined type
II Size of Trash Rack (W x H) 11 x 12.5 m each
2.8 DESILTING CHAMBERS
!l Type Dufour
'" Length 450m
!l GOC Floor EL 1541 m
II Outlet Gate 6.5 x6.5 m
2.9 SILT FLUSHING TUNNELS
II Shape & Size (WxD) 2.0 x 1.5 m, 0 - Shape
l::t No. of Gates in Each Tunnel 2 Nos. (One service & one emergency)
. '" Size of Gate 2.0x1.5m ~ 3 • ""'- "~.c»A':mm ql"~ QIt<HQ'dI,Q, Tawang Bas;n Prole!
'(('lol(ilTomomof('lO/Nll'~': Ltd ~1~ ~,~._!- .. "
• Il SFT Size & Shape 2.0 x 3,5 m, D-Shape
2.10 HEAD RACE TUNNEL
o Length of Adit No,2
II Length of Adit NO.3
o Length of Adit No.4
Il Length of Adit No,S
:a Length of Mit NO.6
Il Inspection gate in Adit No.1 ,3 & 6
SURGE SHAFT
l::I Number
a Type
o Size
o Shape
1
20m
Circular
EL 1595.5 m
4
2.12 PRESSURE SHAFT I VALVE CHAMBER
2.12.1 From EL1t461.8 to El1296.0 m
o Number
o Type
o Shape
o Diameter
l:I Number
l:I Type
o Shape
Il Diameter
o Length
Il Size (LxWxH)
Il Turbine Axis Elevation
n Type of Turbine
Il Max. Gross Head
Il Rated Net Head
: Spherical
: 2.5m
: Underground
: 800MW
:4
: EL 1038.0 m
: Francis Vertical Axis
t1;f0'!0fomomoWro /NHP;:; Ltd. ~~, m/NehruMarket. Tawang ·""nallliuM ~, ..... _ ...."'_I"'~~.,1~_' . .......... '
1'awallg HE Project Stof<e --II
• 2.15 TRANSFORMER CUM GIS CAVERN CUM DRAFT TUBE GOC
!l Cavern Sir:e (LxWxH)
II TRT outlet gate
2..19 PROJECT COST AND TARIFF
II Project Cost
:4
: EL 1058.25 m
: EL 1044.6 m
: EL 1043.0 m
: 40x210m
': 800MW
7. Location ofthe Project/Scheme.
iii) Forest Division
iv) Area offorest land including underground area proposed for Diversion (in hal.
v) a) Legal status offorest b) Forest type
vi) Density of vegetation
vii) Species-wise (Scientific names) and diameter class wise enumeration oftrees (to be enclosed. In case of irrigationIHydel projects enumeration at FRL, FRL-2 meter and F'RL4 meter enclosed.
viii) Brief note on vulnerabllity ofthe forest area to erosion.
ix) Approximate distance ofproposed site for diversion from boundary offorest.
x) Whether forms part ofnational Park, Wildlife sanctuary, Biosphere reserve, Tiger reserve, Elephant corridor, etc (If so, The details of the area and comments ofthe Chief Wildlife Warden to be annexed).
xi) Whether rare/endangered/unique species offlora and fauna found in the area if so details thereof.
xii} Whether any protected archaeological heritage site/defense establishment or any other important monument is located in area. Ifso, the details thereof with NOC from competent authority, if required.
8. Whether the requirement offorest land as Proposed by the User Agency in col2 ofpart-I is
: - Arunachal Pradesh
: - Tawang District
:- Social Forestry Division, Tawang
: - 116.62 Ha. (Against Tawang HE Project Stage II ofNHPC). Total land required 237.88 ha (Forest Cover 96.95 ha, Non-Forest Cover 121.26 ha & Underground 19.67 ha)
:- Unclassed Forest : - Class-VI f Himalayan Dry Deciduous Forest
: - 0.5 (Dense)
: - Attached as Annexure-II
: - Rocky and stable, not vulnerable to erosion. : - No notified forest in this division. The
Proposed site ofdiversion is within the Unclassed forest area
:-No. :- No rare and endangered flora and fauna is
found reported from the proposed project area.
: - No
unavoidable and barest minimum for the project. : The proposed area is the barest If no, recommended area item-wise with details minimum and unavoidable. of alternatives examined.
9. Whether any work in violation ofthe Act has been carried out(YeslNo). if yes, details ofthe same including period ofwork done action taken: - No on erring officials. Whether work in violation is still in progress.
10. Details ofcompensatory afforestation scheme i) Details ofnon-forest area/degradedfforest area : - Maps enclosed herewith. Single patch of
identified for compensatory Afforestation, its 194.00 ha degraded Community Land. distance from adjoining forest, number of patches, size of patch.
___ __ ________ _
-:"!' ­.,
ITSLbe til.L"cLlli1 by the cOllc~rned ChiefCollservator of Forests)
1. Whether site, where the forest land involved is :- Yes, I have inspected the Forest land located has been inspected by the concerned Chief Conservator of Forests (Yes/No.), if yes, the date of the inspection & observation made in form of inspectionllo(e to be enclosed.
2. Whether the concerned Chief Conservator of the Forests agree with the information given in the Part-II and recol11mendation of Deputy Conservator Forests.
3. Specific recommendation of concerned Chief Conservator of Forests for acceptance or otherwise of the proposal with detailed reasons.
Date ;- II til Apri1/2011.
Place:- Banderdewa Arunachal Pradesh
involved for diversion, for construction of Tawang Basin H.E. project 0115.4.201.1. Details inspection note enclosed.
:- Yes, I agree with the informatiOtlS given by the DFO concerned in Pati-I1
:- The Hydroelectric Project after implemRllta­ tion provide the clean energy to the energy starved backward state and also improve the Socioeconomic conditions ofthe local tribal people. The project is a part of the 50,000 MW Hydropower initiative of Govt. oflndia. Recommended for acceptance by competent authority.
Signature -.---­
Chief Conservator" of Forests Western Circle:: Banderdewa
PART-IV (Co be filled up in by the Nodal Officer or Principal Chief Conservator of Forests or Head
of Forest Department.)
17, Detailed opinion and specific recommendation of the State Forest Department for acceptance of otherwise of the proposal with remarks::
(While giving opinion, the adverse comments made by the concerned Conservation of Forests or Deputy Conservation of Forests should be Categorically reviewed and critically Commented upon).
Date: (~.1·11
Place:~~
PART-V ( To be filled in by the Secretary in charge of Forest Department or by any 0
authorized officer of the State Government not below the rank of an Under Secretar
18. Recommendation of the State Government (Adverse comments made by any officer or authority in Part-B or Part·Cor Part·D above should be specially commented upon)
Date: lS· J; hJ't