210 Mw Sirkari Bhyol Rupsiabagar Hydro Electric Project Uttaranachal

Home , Milam Glacier

50,000 MW HYDROELCTRIC INITIATIVE

Government of India Ministry of Power Central Electricity Authority

210 MW SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT UTTARANACHAL

Preliminary Feasibility Report February, 2004

WATER AND POWER CONSULTANCY SERVICES (INDIA) LIMITED

(A Govt. of India Undertaking)

5th Floor, “Kailash”, 26, Kasturba Gandhi Marg, New Delhi ‐ 110001

PFR STUDIES OF SIRKARI-BHYOL RUPSIABAGAR HE PROJECT

FOREWORD

The economic growth is solely dependent on the level of Infrastructural Development and electrical energy forms a very important input to the development process. Hydro power development is inexhaustible and most eco friendly development of energy resources. Hydro power development in last 100 years could be achieved to about 25% of the total power generation which is about 32% only of the total hydro potential of the country. Looking to the future demand of energy matching with the economic growth, it is imperative to harness the balance hydro power potential in planned manner. Hon’ble Prime Minister of India Sh. A.B. Vajpayee has taken a gigantic step by launching 50,000 MW Hydro Power Initiative during May, 2003 to accomplish the target by the XI th five year plan onwards.

WAPCOS feels honoured to be associated with this Hydro Power Initiative and the follow up under taken by the Minister of Power and CEA, Govt. of India and have entrusted with the responsibility of preparation of 71 Nos. of Prefeasibility stage reports. The entire work is being carried out by our in-house expertise. The studies have been carried out in close association with CEA, CWC, GSI, SOI, IMD and State Departments incorporating their suggestions / comments in finalizing the respective PFR studies. WAPCOS presents the PFR stage report of Sirkari Bhyol Rupsiabagar H.E. Project which has an installed capacity of 210 (3x70 MW).

WAPCOS is grateful to Central Electricity Authority and Ministry of Power, GOI for providing this opportunity and to be associated with the Hydro Power Initiative and we assure for our best efforts and acknowledge with thanks the various departments for extending co- operation to WAPCOS in completing the task in a scheduled manner.

New Delhi (D. DATTA) March, 2004 Chairman & Managing Director

PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

SIRKARI BHYOL RUPSIABAGAR H.E. PROJECT (210 MW)

CONTENTS

CHAPTERS NAME Page No.

Salient Features i-iii I Executive Summary 1-1 to 1-5 II Background Information 2-1 to 2-5 III The Project Area 3-1 to 3-4 IV Topography and Geotechnical Aspects 4-1 to 4-4 V Hydrology 5-1 to 5-18 VI Conceptual Layout and Planning 6-1 to 6-13 VII Power Potential Studies 7-1 to 7-6 VIII Power Evacuation 8-1 to 8-2 IX Initial Environment Examination Studies 9-1 to 9-23 X Infrastructure Facilities 10-1 to 10-4 XI Construction Planning & Schedule 11-1 to 11-7 XII Cost Estimate 12-1 to 12-3 XIII Economic Evaluation 13-1 to 13-3

APPENDICES

1.1 Observation of CWC on Hydrological studies 1.2 Replies to observations of hydrological studies 2.0 Drawings

PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

LIST OF DRAWINGS

SIRKARI BHYOL RUPSIABAGAR H.E. PROJECT

S. NO. DESCRIPTION DRAWING NO.

1. Vicinity Map -

2. General Layout Plan of Sirkari Bhyol WAP/PFR/RUPSIABAGAR/1001 Rupsiabagar 3. L-Section Profile along Water Conductor System WAP/PFR/ RUPSIABAGAR /1002

4. Upstream Elevation and Top Plan of Dam WAP/PFR/ RUPSIABAGAR/ 1003

5. Sections of non-overflow and overflow blocks of WAP/PFR/ RUPSIABAGAR /1004 dam

6. Power Intake Plan & Section WAP/PFR/ RUPSIABAGAR/1005

7. Head Race Tunnel Typical Sectional Detail WAP/PFR/ RUPSIABAGAR /1006

8. Power House Plan WAP/PFR/ RUPSIABAGAR/1007

9. Power House Cross Section WAP/PFR/ RUPSIABAGAR/1008

10 Single Line Diagram WAP/PFR/ RUPSIABAGAR /1009

ii PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

SIRKARI BHYOL RUPSIABAGAR H.E. PROJECT

SALIENT FEATURES

LOCATION

State Uttaranchal District Phitoragarh River Goriganga Dam site U/S of confluence of Ralam Gad With Goriganga river

Nearest Airport Delhi Nearest rail head Tanakpur Location of dam site Latitude 30 011 ′ 6″ N Longitude 80 014 ′ 16 ″ E

HYDROLOGY

Catchment area at dam site 1160 sq kms Maximum average Discharge at dam site 77.68 cumec Minimum average Discharge at dam site 30.73 cumec

RESERVOIR

Full reservoir level (FRL) 2120 m Minimum drawdown level (MDDL) 2110 m Gross storage at FRL 3.74 M cum Live storage 1.17 M cum Area under Submergence at FRL 12.80 ha

DIVERSION TUNNEL

Number 1 Size 7.5 m dia Length 550 m Diversion discharge 274 cumec

DAM

Type Concrete gravity Top elevation of dam 2123 m Height of dam above 103 m deepest foundation level

i PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

Length of dam at top 232 m River bed level 2040 m

SPILLWAY

Design flood 3681.71 cumec Type Ogee Crest elevation 2101 m Number 2 bays in 3 blocks Length of spillway 46 m Energy dissipation Ski jump bucket

INTAKE

Invert level 2102 m Number 2 Size of gate opening 3.25 m x 3.25 m Trash rack 4.5 m x 8 m x 10 nos.

DESILTING CHAMBER

Number 2 Size 9 m x 14 m Length 250 m Design discharge 37.54 cumec each Particle size to be removed 0.20 mm and above

HEAD RACE TUNNEL

Number 1 Size 4.5 m dia Shape Horse shoe Length 800 m

SURGE SHAFT

Number Not required Size Height

PRESSURE SHAFT

Numbers 1 Size 3.75 m dia Length 580 m

POWER HOUSE

ii PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

Type Underground Installed capacity 210 MW (3 x 70) Number of units 3 Power house cavern size 16.5 m x 88 m Type of turbine Vertical francis C.L. of turbine 1711.50 m Rated head 388.97 m

TAIL RACE

Size 4.5 m dia Type Tunnel Length 370 m Design discharge 60.06 cumec River Bed Level 1716 m Normal TWL 1720 m

SWITCHYARD

Size GIS on the floor above the transformers in transformer cavern of 16 m x 58 m

POWER GENERATION

Installed capacity 210 MW Annual energy generation i) 90% dependable year 967.97 GWh ii) Energy in 90% year 937.23 GWh on 95% availability

COST ESTIMATES & FINANCIAL ASPECT (Rs. Crores)

Civil Works 561.01 Electro Mechanical Works 191.55 Sub Total 752.56 Interest during construction 141.07 Total (Generation) 893.63 Transmission cost 6.00 Grand Total 899.63 Tariff for first year Rs. 1.55 KWh Levellised Tariff Rs. 1.25/KWh

CONSTRUCTION PERIOD 5 ¾ years

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

CHAPTER – I

EXECUTIVE SUMMARY

1.1 INTRODUCTION

The Sirkari Bhyol Rupsiabagar Hydroelectric Project located in Pithoragarh district of Uttaranchal envisages utilization of the waters of the river Goriganga, a tributary of river Kali (Sarda) for power generation on a run of river type development, harnessing a head of about 400 m.

The project with a proposed installation of 210 MW (3 x 70 MW) would afford an annual energy generation of 967.97 GWh in a 90% dependable year. The tariff from the project at present day cost would be Rs. 1.25 /KWh (levellised).

The diversion site is located at latitude 30 011 ′ 6″N; Longitude 80 014 ′ 16 ″ E. The dam site is approachable from Tanakpur-Jauljibi-Munsiyari road at a distance of 340 kms from Tanakpur. The nearest rail head is located at Tanakpur and nearest airport is located at Delhi.

1.2 SCOPE OF WORKS

The Sirkari Bhyol Rupsiabagar HE project envisages construction of:

• a 103 m high concrete gravity dam across river Goriganga to provide a live storage of 1.17 M cum with FRL at 2120 m and MDDL at 2110 m. • 2 no desilting chambers of length 250 m (L) and size 9 m (W) x 14 m (H) to remove silt particles of size 0.20 mm and above; • a 0.8 km long and 4.5 m dia head race tunnel

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

• 580 m long 3.75 m dia pressure shaft • a underground power house having an installation of 3 vertical Francis driven generating units of 70 MW each operating under a rated head of 388.97 m; and • 370 m long tail race tunnel to carry the power house releases back to the river

1.3 HYDROLOGY

The river Goriganga drains a catchment area of about 1160 sq. km at the proposed dam site. The water availability for the project has been considered on the basis of 10 daily discharge series at Pancheswar dam site for the period 1962-1992. The flow series for Sirkari Bhyol Rupsiabagar HE project were derived by carrying out run off-run off correlation between concurrent flows at Chiphaltara & Pancheswar and subsequent reduction in proportion to the catchment area. The computed inflow series worked out has been utilized for Power Potential Studies. The design flood has been assessed as 3681.71 cumec.

1.4 POWER POTENTIAL STUDIES

The computed inflow series for 30 years viz 1962-63 to 1991-92 has been considered in the assessment of a power benefits from the project. As per GOI notification for tariff the year 1965-66 corresponds to 90% dependable year. An installation of 210 MW comprising 3 generating units of 70 MW has been proposed. The energy availability from the project in 90% & 50% dependable years has been summarized below:

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

Particulars 90% 50% (Dependable Year) (Dependable Year)

Annual Energy Generation

Annual Energy Generation (GWh): 967.97 1140.37 Annual Load Factor (%) : 52.62 61.99

Generation during Lean Flow Season (Dec.-Feb.)

Energy output (MWc) 39.63 Load Factor (%) 18.87

The design energy for tariff at 95% availability in a 90% dependable year has been worked out at 937.23GWh.

A live storage of 1.17M cum has been provided in the diversion dam which would enable the station to operate as peaking station. The pondage is equivalent to 1136.33 MWh which is sufficient to operate the station for 5.41 hours.

1.5 POWER EVACUATION ASPECTS

The 210 MW of power would be transmited by 220 kV D/C line to Rupsiabagar-Khasiyabara H.E. Project.

1.6 ENVIRONMENTAL ASPECTS

The project is located in the remote area of Gorgiganga valley. The total land requirement for the construction of various components is 350 ha. Private land is 2.0 ha. Most of the land falls under the category of forest land. Based

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

on assessment of environmental impacts, management plans have to be formulated for Catchment Area Treatment, compensatory afforestation and other environmental issues. These issues would be addressed during the investigation for DPR.

1.7 ESTIMATES OF THE COST

The project is estimated to cost Rs. 893.63 Crores including IDC at June, 2003 price levels. The preliminary cost estimate of the project has been prepared as per guidelines of CEA / CWC. The break down of the cost estimates is given below: Civil Works : Rs. 561.01 Crores Electro Mechanical Works : Rs. 191.55 Crores Sub total : Rs. 752.56 Crores Interest During construction: Rs. 141.07 Crores Total (Generation) : Rs. 893.63 Crores Transmission cost : Rs. 6.0 Crores Grand Total : Rs. 899.63 Crores

1.8 FINANCIAL ASPECTS

As indicated above, the Sirkari Bhyol Rupsiabagar HE project, with an estimated cost (Generation only) of Rs. 893.63 Crores (including IDC of Rs. 141.07 Crores) and design energy of 937.23 GWh in a 90% dependable year is proposed to be completed in a period of 5 ¾ years. The tariff has been worked out considering a debt-equity ratio of 70:30, 16% return on equity and annual interest rate on loan at 10%. The tariff for first year and levellised tariff (at power house bus bar) have been worked out as Rs. 1.55/KWh & Rs.1.25/KWh respectively.

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

1.9 CONCLUSIONS

Sirkari Bhyol Rupsiabagar HE project involves simple civil works and could be completed in 5 ¾ years. The project would afford a design energy of 955.9 GWh in a 90% dependable year. The cost per MW installed works out as Rs.3.58 Crores. The Preliminary Feasibility Report indicates that the scheme merits consideration for taking up for Survey & Investigation and preparation of DPR.

1-5

PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

CHAPTER - II

BACKGROUND INFORMATION

2.1 GENERAL

In Nov.2000, Uttaranchal State was carved out of thirteen hill districts of Northern U.P. The state borders with Nepal and Tibet on the east, Central Himalayas on the north, Haryana and Himachal Pradesh on the west and northwest respectively.

Geophysically the state has four Mountain Zones namely Foot hills, Lesser Himalayas, Greater Himalayas and Trans-Himalayas. The mountains are covered with perpetual snow and glaciers and has gifted the north India a perennial river system of the Ganga and its tributaries. The tributaries of Ganga, namely Alaknanda, Bhagirathi, Yamuna and Sarda originate from the foothills of snow capped peaks and glaciers in the Central Himalayas and incise their respective courses through the rugged terrain, splash and surge the steep gradients and most of the streams offer excellent potential for Hydro power development.

The region is blessed with magnificent glaciers, majestic rivers, gigantic snow capped peaks, Valley of flowers natural beauty and rich flora and fauna. Many holy shrines have blessed the state spiritually and given the name of Dev Bhoomi or Land of Gods. The seasonal influx of tourists, the seekers of peace for visit to the holy shrines and lovers of nature contribute to the state income.

The state is divided into Kumaon and Garhwal Divisions with 13 districts, 42 tehsils, 95 blocks, and 15689 inhabited villages and 73 towns. The State has a geographical area of 53, 119 sq. km which is 1.62% of the total area of the country and supports 84.8 lakh population which is 0.83% of

2-1 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

the total population of India. The percentage of villages having population more than 500 is about 11.4% (1991 Census). The existing majority of smaller settlements of Uttaranchal pose a serious challenge for economic infrastructure and lack of services to the far flung places in the hilly terrain makes Uttaranchal as one of the extremely backward states of India. It has 76.1% electrified villages as compared to 75.3% of villages of U.P. The average per capita consumption of electricity is 245.57 kWh whereas Dehradun and Nainital consume 480.81 and 447.33 kWh respectively with a minimum consumption of 43.7 kwh in Uttarkashi.

2.2 POWER SCENARIO IN NORTHERN REGION

2.2.1 Present Status

Most of the states in the Northern Region have been experiencing energy shortage as well as shortage of Peak Power of varying degree. Actual Power supply position in the Northern Region during the year 2001-2002 has been as under:

Energy (in MU), year 2001-2002

State Requirement Availability Shortage( -)/ %age Surplus (+) Chandigarh 1110 1108 (-) 2 0.2 Delhi 19350 18741 (-)609 3.1 Haryana 18138 17839 (-)299 1.6 Himachal 3293 3206 (+) 87 2.6 Pradesh Jammu & 6635 5899 (-) 736 11.1 Kashmir Punjab 28780 27577 (-)1203 4.2 Rajasthan 24745 24495 (-)250 1.0 Uttaranchal-U.P 48332 43545 (-)4787 9.9 Northern Region 150383 142410 (-)7973 5.3

2-2 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

2.2.2 Peak Power (in MW), year 2001-2002

State Peak Peak Met Shortage(-)/ %age Demand Surplus (+) Chandigarh 180 180 0 0.0 Delhi 3118 2879 (-)239 7.7 Haryana 3000 2900 (-)100 1.6 Himachal Pradesh 562 562 0 0.0 Jammu & Kashmir 1209 999 (-) 210 17.4 Punjab 5420 4936 (-)484 8.9 Rajasthan 3700 3657 (-)43 1.2 Uttaranchal-U.P 7584 6887 (-)607 9.2 Northern Region 24773 23000 (-)1773 7.2

2.3 NECESSITY OF HYDRO POWER DEVELOPMENT IN UTTARANCHAL

2.3.1 Hydro and Thermal Power Mix

The main resources for generating electricity are by utilising the hydro potential available along the river drops besides the use of fossil fuel. Presently the ratio of thermal generation and Hydro-electric generation in Uttaranchal Power grid, is quite disproportionate. With the diminishing coal resources and difficult oil position all over the world, it is necessary that electric generation be aimed to achieve the economic balance of 40:60 between the hydro and thermal generation of power, as against the existing 25:75 ratio.

2.4 BRIDGING THE GAP OF HYDRO POWER GENERATION

The requirement of power in Uttranchal is very fluctuating because of many seasonal and other similar demands of industries. To improve the share of

2-3 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT hydro-power generation it is essential to develop the hydroelectric power potential of state which is about 15110 MW, of which so far only 8% has been developed.

The existing installed generating capacity in the State is about 1286 MW ( 2003 fig) and the entire capacity is from hydro generation. There is no thermal power generation in the state . The major hydro power stations under construction in the state are (i) Maneri Bhali, Stage-II (304 MW), (ii) Lakhawar Vyasi, Stage-I (300 MW), (iii) Lakhwari Vyasi, Stage-II (120 MW), (iv) Srinagar H.E. Project (330 MW), (v) Vishnuprayag Scheme (400 MW), (vi) Tehri Dam Project, Stage-I (1000 MW), (vii) Tehri Dam Project, Stage-II (1000 MW), (viii) Koteshwar Dam Project (400 MW), and (ix) Dhauliganga H.E. Project, Stage-I (280 MW).

With the rising hydro power generation and improving efficiencies in distribution of electricity, Uttaranchal hopes to offer energy at stable prices for eco-friendly industrial development. Though the state is more or less sufficient in its energy generation to meet its own requirement, there is an urgent need to develop its huge untapped hydro power potential in an early and efficient manner, manage efficiently the hydro generation capacity of existing power stations and to develop and promote new Hydro projects with the purpose of harnessing hydropower resources in the state for economic well being and growth of the people in the whole region.

In order to meet the load demand satisfactorily, it is considered essential to maintain a minimum gross margin of about 30 per cent over the projected peak demand while planning for expansion of power supply facilities.

To bridge the gap between the demand for power and the availability of power, some of the major hydro-electric schemes identified in Ganga Valley for development are indicated below :

2-4 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

i Tapovan Vishnugad (360 viii Karanprayag Dam (252 MW) MW) ii Bowala Nandprayag (132 ix Lata Tapovan (108 MW) MW) iii Kishau Dam (600 MW) x Vishnugad Pipalkoti (340 MW) iv Pala Maneri (416 MW) xi Pancheshwar Dam v Loharinag Pala (520 MW) xii Chamgad Dam (400 MW) vi Koth Bhel (1000 MW) xiii Dhauliganga, Stage-II vii Utyasu Dam (1000 MW)

2.5 PRESENT STUDIES

2.5.1 With a view to prioritize the large number of identified schemes to harness vast untapped hydro resources in the order of their attractiveness for implementation, “Ranking studies” were carried out by CEA. Subsequently, after consultation process initiated by Ministry of Power with various state agencies, CPSUs etc., it was considered appropriate that Preliminary Feasibility Report (PFRs) of selected hydroelectric projects be taken up so that feasibility of the schemes considered in ranking studies could be established.

2.5.2 In order to achieve the above objective the present preliminary feasibility stage report presents the Sirkari Bhyol – Rupsiabagar H.E. Project located in Pithoragarh District, as detailed in the subsequent Chapters.

2.5.3 In view of the power scenario described above, the envisaged Sirkari Bhyol - Rupsiabagar H.E. Project with an installed capacity of 210 MW with help a long way in meeting the projected power demand.

2-5 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

CHAPTER-III

PROJECT AREA

3.1 GORIGANGA RIVER BASIN

The Goriganga river is a tributary of river Sarda, known as Kali river in this region of Uttaranchal state. The Goriganga originates in the Himalayan ranges from Milam glacier and flows generally in South-South East direction. The river experiences a drop of 2530 m in its course of about 95 Km till it joins Sarda (Kali) river. The catchment of the river at the diversion structure of proposed Sirkari Bhyol – Rupsiabagar H.E. Project is 1160 sq.km. The catchment includes 29 glaciers and permanent ice caps measuring 346 sq. km. The seasonal snow covered area in the catchment is about 758 sq.km.

3.2 GORIGANGA BASIN DEVELOPMENT

The toposheets prepared by Survey of India reveal that there is tremendous scope of harnessing the hydro power potential available in this basin by using a drop of about 2280 m available in the river reach between EL 2960.0 m and 680.00 m which happens to be FRL of the proposed Pancheshwar Multipurpose Project.

Central Electricity Authority has identified the following schemes in their Hydro Power Potential Assessment:

3-1 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

As per CEA As per WAPCOS’ Investigations S.No. Name of Scheme FRL TWL FRL TWL (m) (m) (m) (m) 1. Mapang-Bogudiyar 2920.0 2440.0 2960.0 2440.0 2. Bogudiyar-Sirkari Bhyol 2440.0 1960.0 2440.0 2120.0 3. Sirkari Bhyol-Rupsiabagar 1960.0 1720.0 2120.0 1720.0 4. Rupsiabagar - Khasiyabara 1720.0 1280.0 1720.0 1237.0 5. Devi Bagar – Khartoli 1120.0 1040.0 1237.0 976.0 (Goriganga III-A) 6. Khartoli Lumti Talli 1040.0 880.0 976.0 913.0 7. Goriganga Stage II Not Identified 913.0 710.0 8. Garjia Dam 880.0 640 Abandoned because of Goriganga Stage II & Pancheswar M.P. Project

CEA has awarded the preparation of Pre-feasibility Reports to WAPCOS for scheme at Sl.No. 1 to 4, 6 & 8. The last scheme has been dropped because of Goriganga Stage II project for which NHPC has already prepared the Feasibility Report and Pancheshwar M.P. Project being investigated by CWC & Nepal.

3.3 DESCRIPTION OF SIRKARI BHYOL – RUPSIABAGAR H.E. PROJECT

Sirkari Bhyol – Rupsiabagar H.E. Project upstream of the proposed Rupsiabagar – Khasiyabara H.E. Project will harness the hydro-power potential of the river between EL 2120.0 m and EL 1720.0 m.

The project envisages the construction of a concrete gravity dam with overflow spillway upstream of the confluence of Ralamgad with Goriganga with FRL at +2120.0 m. This spillway is designed to pass a maximum flood of 3682 cumecs. A battery of 2 intakes each having capacity 37.54 m 3/s, is proposed on the right bank of river. The trash racks of each intake after 50% clogging is designed to restrict the inflow at a maximum velocity of 0.75 m/s. The inflow through each intake is controlled by individual intake gate of size 3.0 m x 3.0 m. The inflow into each intake is collected by separate intake tunnel of 3.0 m dia each and is led to individual desilting chamber which is designed to flush out all silt particles of 0.2 mm size and above. A control

3-2 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

gate shaft is proposed at the end of each desilting chamber for purposes of desilting the individual chamber, when required. Each chamber is provided with silt flushing gate, so that silt laden water can be flushed out to a common silt flushing tunnel (steel lined to withstand erosion) which brings the silt laden waters back to the river downstream of diversion structure.

The silt-free waters from the desilting chambers is led to a 800 m long 4.3 m dia horse-shoe shaped Head Race tunnel. Since the length of water conductor is less than 5 times the head, no surge shaft is proposed in this scheme and the flow is directly fed into a pressure shaft of 3.75 m dia (steel lined) which trifurcates near the underground power house to feed 3x70 MW Francis turbines.

The underground power house complex consists of 2 separate caverns, one for the generating units and another for the transformers etc. Both the caverns are inter-connected by bus bar tunnels/galleries. The power house cavern will have an installed capacity of 3 x 70 MW vertical Francis turbines. The transformer cavern will house transformers and GIS system. A cable cum ventilation tunnel has been proposed for connection to a small out door switchyard. The power house and transformer cavern will be approached from a road proposed outside by means of a common 7.0 m dia D-shaped main access tunnel.

The draft tube tunnels at the bottom of power house will merge into a manifold which will have a 4.5 m dia D-shaped tailrace tunnel. The draft tube gates will be operated by a hoisting arrangement provided in the transformer cavern. The detailed description of the project features are given in Chapter-VI.

3.4 SOCIO ECONOMIC PROFILE

The entire region has undulating topography with loft mountains jutting out that create a rugged terrain with steep valleys. The geology, soil texture and

3-3 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT climate are highly variable including the habitation pattern. It has sparse and scanty population, small sized villages, scattered on the hilly landscape. Out migration of able bodied persons is common. Subsistence level agriculture based economy mostly prevails with marginal holdings. The infrastructural development becomes very costly in such terrain.

Pithoragarh District has an area of 17.3% and supports 9.55% population as compared to the state. The density of population is about 64 persons per sq.km as against 116 persons per sq.km of the state. The literacy rate both among males and females is lowest in the district standing at 59.0% and 38.37% as against the state average of 59.6% and 42.9% respectively. The population of schedule castes is about 20.45% against state average of 16.7%.

The main work force, about 75%, is engaged in primary and secondary sectors and the balance in allied sectors. As regards land use pattern about 70% of land is under forest and barren lands.

About 64% of the inhabited villages are connected with road and the remaining villages suffer because of remoteness and higher altitudes. As regard rural electrification, Uttaranchal has 76.1% electrified villages and the per capita consumption of electricity of the state is about 245.6 kwh per annum. However, Almora and Nainital have much higher consumption.

3-4 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

CHAPTER – IV

TOPOGRAPHIC AND GEOTECHNICAL ASPECTS

4.1 INTRODUCTION

The proposed Sirkari Bhoyal Rupsiabagar hydroelectric project on Goriganga river envisages construction of 103 m high concrete gravity dam above the deepest foundation level about 1.8 km upstream of confluence of Ralamgad with Goriganga. An underground power house with an installed capacity of 210 MW (3x70 MW) is located on the right bank hill of the river about 1 km upstream of confluence of Piltigad. The other main structures of the project include a 800 m long H.R.T., penstock / pressure shaft and tail race works.

4.2 PHYSIOGRAPHY

The area between Pithoragarh (1645 m), Munsiyari (2100 m) and Dharchula (700 m) is rugged Himalayan terrain forming a part of catchments of river Kali or Mahakali which nearly demarcates Indo-Nepal border. The area is drained besides Kali river, by its main tributaries Goriganga and by a number of streams (gad) like Piltigad, Pehal and Chambhu.

4.3 RAINFALL AND CLIMATE

The rainfall data collected from Central Water Commission office, Tanakpur indicates that main months of rainy season are July, August and September. The average monthly rainfall data of the year 1999 for Pancheswar area is given below, which generally indicates the extent of rainy season in a year:

4-1 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

Month Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. Rainfall 1.60 0.11 - - 3.10 2.7 5.72 4.23 3.11 2.02 - - (mm)

The area witnesses cold temperate climate during summer and winters are also not very cool.

4.4 REGIONAL GEOLOGICAL SETUP

The rocks occurring at and in the vicinity of the proposed dam site are prophyroblastic gneiss and schists which are included in the Central Himalayan Crystalline. The region is bounded by two major planes of dislocation viz. the Main Central Thrust in the South while the Dar Martoli Fault marks its northern limit with the rocks of the Tethyan zone.

The Main Central Thrust (MCT) is an important structural discountinuity in the area which separates the rocks of the Garhwal groups from those of Central Crystalline Group comprising of porphyroblastic augen gneiss, chlorite mica schist and phyllitic quartzite. The Main central Thrust dips at a moderately high angle towards North and crosses the Goriganga river about 10 kms upstream of Jauljibi.

The Dar Martoli Fault demarcates the boundary between Central Himalayan Crystallines and rocks of Tethyan zone i.e. Budhi schist etc. The regional trend of the fault is WNW – ESE with high angle dip towards North and is located far away from the project area.

4.5 GEOLOGY AT THE DAM SITE

The river Goriganga at the proposed dam site flows through a very narrow gorge. The rocks exposed in the area are mainly porphyroblastic augen

4-2 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

gneiss and chlorite schist belonging to Central Himalayan Crystalline group. The foliation of the gneisses in the area is N 70 0 E – S 70 0 W with a dip of 40 0 to 45 0 towards NW in the upstream direction.

The rocks are well jointed and traversed by shear zones in different directions. The apparent lateral continuity of the rocks on the abutments probably indicates no displacement in the area.

4.6 POWER HOUSE SITE

The power house is located on the right side hill of the river where good rock is available for the underground power house cavity.

4.7 CONSTRUCTION MATERIAL

River bed material may be sorted, crushed and utilised for construction purposes. In addition the terraces available in the area near the structures may be tested and used for construction.

4.8 SEISMICITY OF THE AREA

The area encompassed by the project falls in Zone-V of the seismic zoning map of India (I.S. 1893 – 1984). Clusters of epicenters of medium to shallow earthquakes with magnitudes ranging between 5 and 6.5 are shown on the map of India (Appendix A of the Indian standard, mentioned above) in and around the proposed project area. This fact points towards a high incidence of the seismic activity in the area.

The Bajang (Nepal)-Dharchula earthquake (M=6.1), which occurred on 29 th July 1980 had its epicentral tract in Dharchula area. A maximum intensity of VIII was assigned to the earthquake. Therefore, a suitable seismic factor would have to be adopted for designing the structures in the project area.

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4.9 CONCLUSIONS AND RECOMMENDATIONS

(i) The rocks exposed in the project area are porphyroblastic augen gneiss and chlorite mica schist belonging to Central Himalayan Crystalline Group. (ii) The overburden in the river bed at the proposed dam site may be of the order of ± 10 m which needs to be confirmed by drilling. (iii) Detailed geological investigations for the project structures including geological mapping needs to be done at the DPR stage after identifying the same on large scale maps. (iv) The project area falls in Zone-V of the seismic zoning map of India and hence suitable seismic factor will have to be provided in the design of various project structures.

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

CHAPTER – V

HYDROLOGY

5.1 Water Availability Studies

5.1.1 Catchment Area and River

The proposed Sirkari Bhyol Rupsiabagar Barrage site is located on the river Goriganga which is a sub system of Sarda Basin. The Goriganga river originates in the Himalayan ranges from Milan glacier at an EL 3600 m and flows generally in the S-SE direction for about 90 km after which it joins the Kali river about 1km d/s of Jauljibi. The river Kali (also as Sarda in d/s stretches) finally joins the river Ganga. The Goriganga catchment contains 29 glaciers and permanent ice caps measuring 346 sq. km. The seasonal snow cover area in the catchment is about 758 sq. km. The total catchment area of the river Goriganga upto Sirkari Bhyol Rupsiabagar is 1160 sq. km. The catchment area map of Sirkari Bhyol Rupsiabagar Barrage is shown as Plate-5.1.

The elevation in the catchment ranges from 6000 m in the upper reaches to around 900 m near the dam site.

5.1.2 Data Availability

(a) Rainfall

The rainfall data in the Goriganga basin has been measured for short periods at seven raingauge stations by NHPC given as under in Table – 5.1.

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

Table – 5.1 Rainfall data availability Sl. No. Name of rainguage station Duration 1 Tham March ′84 to Dec. ′88 2 Mad kot Oct. ′87 to Jan ′88, March ′88 3 Bangapani July ′86 to Dec. ′88 4 Devbagar June ′86 to Dec. ′88 5 Jauljibi Jan ′77 to Nov. ′83 6 Munsyari June ′1986 to Dec. ′88 (May, July & Oct. ′88) 7 Chiphaltara July ′86 to Dec. ′88

The average annual basin rainfall is estimated as 2595 mm. Due to intermittently missing rainfall data and non-availability for later years it has not been possible to use the same for water availability studies in the present PFR studies.

(b) Gauge and Discharge Data

The daily gauge and discharge data as observed by NHPC is available at six G & D sites as presented in Table – 5.2 below: Table – 5.2 Gauge and Discharge data Sl. No. G & D Site Data availability 1 Tham Oct. ′83 to Dec. ′87 2 Mad kot April ′84 to Dec. ′90 3 Bangapani Feb. 1984 to Dec. ′87 (except Dec. ′85, Jan. 1986, Feb. ′86, Sept. 87 ′ and Oct. ′87) 4 Devbagar June 1984 to Dec. 1991 5 Jauljibi Aug. ′76 to July1987 6 Madkini June ′87 to Dec.1991

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

The sediment data at Tham G & D site is available for the period July 1984 to Dec. 1988.

5.1.3 Methodology

The Mean Monthly flows of river Mahakali at Pancheswar (CA 12100 sq. km.) are available for the period 1962 – 1992 (31 years). The G&D data observed by NHPC at Tham is available from March 1984 to Dec, ’87. The Guage & Discharge data for Goriganga at Jaulijibi, CWC site down stream of Tham is available from August 76 to July 87. In order to extend run off series at Tham, M/s NHPC carried out a run off- runoff correlation analysis between Jaulijibi and Tham for average 10 daily discharges for the common data period March 1984 to June 1987. The non linear correlation equation adopted for extending the runoff series is given below:

(-0.007679) (0.98364) Q Tham = e *Q Jauljibi Correlation coefficient = r 0.996

On the basis of above relationship, 10-daily discharge series has been generated from Aug.’76 to Feb’84 at Tham. Thus integrated 10-daily flow series at Tham has been developed for the period 1976 to 1988 by NHPC based on observed data by NHPC & CWC.

In the absence of site specific flow data 10-daily series at Tham has been used as base data to transfer to Chiphaltara (Dam site) on catchment area (C.A.) ratio. The ten daily flow series on river Goriganga at Chiphaltara is available for the period 1977-1988 (12 years). The Pancheswar runoff data used as base, the flows series for Chiphaltara is extended by both linear and non linear runoff – runoff correlation on monthly basis. The regression

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT equations are developed between Pancheswar runoff series and Chiphaltara runoff series of concurrent 12 years flow data for the period 1977-88. Three different correlations between the monthly flows have been established for three distinct periods of the year as shown below keeping view of the predominant factor generating the runoff. Finally these generated series are transposed to Sirkari Bhyol Rupsiabagar (C.A 1160 Km 2) on area proportion basis. The Pancheswar and Chiphaltara monthly flow series are detailed in the Hydrology Report Vol.-II.

(a) Monsoon period (June to September) (Rain fall being causative factor for generation of runoff). (b) Non monsoon period (October to February) (Normal post monsoon depletion of runoff). (c) Snowmelt period (March to May) (Snow melt phenomenon being causative factor of generation of runoff).

The correlation equations for the above mentioned periods for Sirkari Bhyol Rupsiabagar are as follows:

(a) Monsoon Period (June to September)

(i) Linear correlation equation

y = 0.1625x + 54.716 (r = 0.86) x = Monthly runoff in cumecs for monsoon month at Pancheswar y = Monthly runoff in cumecs at Chiphaltara r = correlation coefficient

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

(b) Non monsoon period (October to February) Non linear correlation equation

y = 0.1526 x 1.0045 (r = 0.846)

(i) Linear correlation equation

y = 0.2811 x – 11.532 (r = 0.912) x = Monthly runoff for snow melt period in cumecs at Pancheswar. y = Monthly runoff for snowmelt period in cumecs at Chiphaltara.

The above relationships have been adopted for extension of runoff series of Chiphaltara for the respective periods from 1962 to 1976 & 1989 to 1992. Thus a long terms flow series from 1962 – 1992 at Chiphaltara has been established.

The ratios between 10-daily flows & corresponding monthly flows have been calculated. Accordingly the monthly flow series for the extended periods have been converted to 10-daily flow series (calculation details given in Hydrology Report Vol.-II). The integrated 10-daily flow series along with 50% and 90% dependable year have been presented in Table-5.3 and adopted for planning purpose. The 90% and 50% dependable year correspond to 1965 and 1970 respectively.

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

5.1.4 Comparison of flow data between Jaulijibi & Chiphaltara

CWC is maintaining G & D site on Goriganga river at Jaulijibi. A comparative statement of annual flows has been prepared from 1978 to 1992 between the flows at Garjia dam from NHPC data and flows at Jaulijibi with CWC data (ref. Hydrology Report Vol.-II).

It is observed that the annual observed flows of Jaulijibi site downstream of Garjia dam based on CWC data are generally on the higher side. Therefore, the flow series evolved based on NHPC data is on conservative side and appears reasonable to be adopted for planning purpose.

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

5.2 DESIGN FLOODS

5.2.1 General

The design flood and highest flood level are very much essential for fixing the water way and foundation depths of any hydraulic structure. For a diversion structure, 100 year design flood or standard project flood value is considered for hydraulic design and for storage projects, probable maximum flood or 1000 year return period flood is considered based on the following the methods.

(i) Hydro-meteorological approach (unit hydrograph method). (ii) Flood frequency analysis.

5.2.2 Derivation of Unit Hydrograph

CWC has prepared out Flood Estimation Reports for small and medium catchments for efficient hydro meteorological homogeneous sub-zones. The present studies, are based on “the Flood Estimation Report for Western Himalayas – Zone 7” prepared by CWC and IMD.

The formulae for calculation of various physiographic parameters are given in Table 5.4.

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

Table – 5.4 Parameters Formulae Value t .0 156 4.04 hrs. p  L.L c  2.498    S 

− .0 178 qp 1.048 (t p ) 0.817 cumec/sq. km. W .0 099 2.65 hrs. 50  L.L c  1.954    S  W .0 124 1.42 hrs. 75  L.L c  0.972    S 

.1 769 WR 50 0.189 (W50 ) 1.06 hrs.

.1 246 WR 75 0.419 (W75 ) 0.65 hrs.

.0 453 TB 14.77 hrs. 7.845 (t p )

QP qp. A 328.52 cumecs t 1 Where T = t + r = 04.4 + = 54.4 hrs. m p 2 2

The nomenclature of the above parameters are the standard representation of the values and detailed in Hydrology Report Vol.-II.

For the present study with a total catchment area of 1160 sq. km an area of 402 sq. km. is considered for the study as 758 sq. km. of the catchment area is under snow and glacier cover (above EL 4500 m). The total length of Goriganga river upto Sirkari Bhyol Rupsiabagar is 47.82 km. For the catchment of Sirkari Bhyol Rupsiabagar the value of L c is 25.28 km. The equivalent slope of the project area is 1 in 55.

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

5.2.3 Design Storm

(a) Design Storm Depth The 1-day probable maximum precipitation (PMP) value of Goriganga sub-basin is adopted as 33.41 cm. The 25 year, 50 year and 100 return period precipitation values (20 cm, 24 cm & 28 cm respectively) are adopted from the Isohyetal Maps.

(b) Design Storm Duration The base period of 15 hours is considered for one day design storm.

(c) Point to Areal Rainfall Ratios For 25 year, 50 year and 100 year return period precipitation an areal reduction factor of 0.930corresponding to rainfed CA of 402 sq. km. and PMP value of 33.41 cms.

(d) Clock Hour Correction A clock hour correction value of 1.15 is adopted for PMF study for converting 1 day rainfall to 24 hr rainfall limited to 50 mm for one day value.

(e) Time Distribution Coefficients The Time Distribution Coefficients for 24 hours is given below: Table – 5.5 Time in Distribution Time in hou rs Distribution hours coefficient coefficient 1 0.17 13 0.79 2 0.27 14 0.82 3 0.36 15 0.84 4 0.43 16 0.86 5 0.48 17 0.88 6 0.53 18 0.90 7 0.58 19 0.92 8 0.63 20 0.94 9 0.67 21 0.96 10 0.70 22 0.98 11 0.73 23 0.99 12 0.76 24 1.00

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

(f) Design Loss Rate A design loss rate of 0.5 cm/hr. has been adopted.

(g) Design Base Flow and Glacial Melt A base flow rate of 0.05 cumecs / sq. km. has been adopted. In addition a glacier melt runoff value of 182.35 cumecs has been adopted as maximum daily discharge during the period of march to April on the basis of observed flow records at near by G& D sites of Devbagar & Madkot (NHPC Sites) for the year 1984 –1990.

(h) Critical Sequence of Rainfall Excess The critical sequence of rainfall excesses are based on rainfall increments into design hyetograph arranged in the form of two bell (12 hours each per day).

5.2.4 Computation of Unit Hydrograph

Using the basic physiographic parameters, the unit hydrograph is plotted and

volume adjusted to 1 cm. With out changing the QP, T m and T B . The surface flow total flood hydrograph has been computed after the rainfall excess increment arranged in a critical sequence along with additional component of base flow and glacier melt.

The detailed calculations showing computation of equivalent slope, physiographic parameters, rainfall excess, convolution and the flood ordinates for PMP, 100 year, 50 year and 25 year return period for Sirkari Bhyol Rupsiabagar are given in the Hydrology Report Volume-II.

A PMF value of 3682 cumec has been adopted for purpose of preliminary project planning. The hydrograph showing peak flood for PMF, 100 year, 50 year and 25 year floods is given in Table 5.6 and also presented in Plate 5.2.

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

Table-5.6 Sl. Return Period Design flood Remarks No. Peak (cumecs) 1. 25 years 1749.44 - 2. 50 years 2169.01 - 3. 100 years 2588.57 - 4. 1000 years 3800 Projected from 25, 50 and 100 years flood peaks using Gumbel probability papers. 5. PMF 3682 -

5.3 FLOOD FREQUENCY ANALYSIS

Flood frequency analysis provides a quick estimate of the design flood and is also useful for checking the design flood values computed by other methods.

It is carried out by (a) the Annual Maximum method, (b) the Peak over Threshold (POT) method.

The long term annual instantaneous peak flow series at project site is not available. As such the 32-year annual peak discharge series of Pancheswar dam site has been used for frequency analysis. The results obtained are transposed to Sirkari Bhyol Rupsiabagar site with correction for the variation of catchment area. The available data are subjected to randomness clock stationary test, outlier test. Extreme value distribution also known as Gumbel distribution and Log Pearson Type III distribution are used for the present study. Chi square test for LPT-III distribution and Gumbel distribution is used to test the goodness of fit.

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

The calculations and conclusions are in the Hydrology Report Vol.-II. As shown in the calculations, the Gumbel’s distribution is found to be better fit for the flow series. The final results of various return period floods estimated at Pancheswar are transposed to Sirkari Bhyol Rupsiabagar barrage site using Dicken’s formula Q = CA 3/4 . The 10,000 year flood value for Pancheswar is 15041.36. Using this relation, the 10000 year flood at Sirkari Bhyol Rupsiabagar found to be 2591.44 cumecs.

5.4 RESERVOIR SEDIMENTATION STUDIES

5.4.1 General

The suspended sediment inflow data is available at Tham G&D site near project site from July '84 to November '88 observed by M/s NHPC. The observations have been taken by Punjab Type Bottle Sampler with grain size classification of coarse (greater than 0.2 mm), medium (0.025 mm to 0.2 mm) and fine (less than 0.075 mm).

The bed gradient of river Goriganga is very steep(1 in 55 up to project site) and the river is also fed from mountaineous catchment with a number of glaciers bring down considerable sediment load during snow melt and floods.

The total average annual sediment inflow is 323 ha-m/ year comprising 281 ha-m/year as suspended sediment and 42 ha-m/year (assumed bed load 15%) as bed load for Goriganga river at Tham. This gives a sediment inflow of 0.15 ha-m/ 100 sq/km/year for Goriganga basin. This estimate is comparable with the sediment inflow estimate of 184 ha-m/sq. km. and 0.14 ha – m / 100 sq. km. / year for adjacent Dhauliganga catchment. The sediment rate considered for Pancheswar Multipurpose Project (CA 12100 sq. km.) is 2.36 mm/hr which is based on six years of Indian observation & 4 years of Nepalese observation. The rate included 20% bed load. The observation by

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

Indian & Nepalese team show marked difference. The silt rate recommended by Department of Science & Technology is 1.65 mm/year for Himalayan rivers. As such the silt rate of Pancheswar appears to be higher.

Since the above average annual rates are based on comparative shorter time horizon an additional load of 15% is added for Goriganga basin silt rate as to make the silt rate representing a long time average. Hence a silt rate of 0.1725 ha-m/100 sq. km./year has been adopted for sedimentation studies of Sirkari Bhyol Rupsiabagar.

5.4.2 Sedimentation aspects

It is observed from the topo sheets that the catchment contains large number of reserved forests, dense mixed jungles of tansen , banj, deodar etc. open scrubs, rockfall sites and moraine deposits carried by glaciers. At higher elevation i.e. beyond proposed scheme Mapang Bogudiyar, the forest cover is almost nil. Open mixed jungle is sparsely located. Major catchment area contains a number of glaciers and bare rocks with little or no soil cover. The average annual sediment rate for Sirkari Bhyol Rupsiabagar Barrage has been estimated to be 1.725 mm The break up of suspended sediment particles for the month of July 1986 (severe monsoon month) based on observed data at Tham on the Goriganga is coarse 31.92%, medium 23.05% and fine 44.75%.

It is important to note that many Himalayan streams carry heavy sediment loads. As such, planning of the project with a long feasible service time of say 70 years may become difficult. For Hydro electric project it is possible to repay the development cost in a few years and the projects can be planned effectively for relatively shorter period. For diversion structures across the rivers, the nominal storage available between the barrage crest level and the

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

river bed level is expected to be fully encroached by the rolling bed load of pebbles, boulders etc. within one or two years and the entire rolling bed load would pass over the crest. This warrants proper protection measures against the damage of downstream glacier.

5.5 CONCLUSION & RECOMMENDATION

(1) The 10-daily flow series of 31 years developed and extended tentatively on the basis of runoff-runoff correlation with Pancheswar flows adopted for preliminary project planning. However, the flow series need to be reviewed when site specific observed flow series of longer periods would become available from the observation agencies. Continuation of all hydrometeorological observation in the existing stations may be assured and identification of new station may be under taken at DPR stage. A gauge, discharge and silt observation site at/near Sirkari Bhyol Rupsiabagar Barrage site should be immediately installed on scientific basis.

(2) It is suggested that short interval rainfall-runoff observation should be initiated at the project site to enable derivation of reliable unit hydrograph from observed data. Similarly detailed storm studies are needed to be carried out preferably by IMD in order to obtain reliable estimate of PMS at highly orographic catchment with snow & glacier covers.

(3) The sediment rate adopted is based on observed suspended sediment data at Goriganga and neighbouring Dhauliganga rivers for about 10 years only. The bed load assumed to be 15% of suspended load is quite tentative. Therefore, the sediment rate needs to be revised with up dated observed data of longer period. The contribution of bed load may be precisely assessed according to concentration of suspended load, type of materials forming channel of the stream, texture of suspended material etc.

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

5.6 OBSERVATIONS OF CWC

The draft report of this project was submitted to CEA for perusal during October 03. The observations received from CWC on the Hydrological studies of this project and the replies for above observations, submitted by WAPCOS are enclosed as Appendices 1.1 and 1.2 respectively.

5-18 Plate-5.2

Flood Hydrographs at Sirkari Bhyol Rupsiabagar

4000

3681.70452 SPF

3000

2588.57348

2169.00584 100 Year 2000 Flood 1749.4382 50 Year (m3/sec)

Discharge Discharge Flood

25 Year 1000 Flood Table - 5.3 Mean Ten Daily Runoff at Mapang Bogudiyar ( Site no 9) on Goriganga

Catchment Area = 829 Sq. Km Unit : Cumecs

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 14.61 11.60 18.27 17.83 28.21 57.22 98.27 182.23 167.08 49.02 21.83 14.66 1962 13.43 12.38 19.98 22.92 32.60 62.63 98.56 187.21 126.62 41.23 18.71 12.89 54.12 12.75 15.17 22.88 28.49 34.12 86.72 104.23 156.74 95.01 28.07 15.95 11.30 10.60 7.42 12.11 13.69 27.53 53.02 115.22 179.19 147.83 37.08 19.91 14.18 1963 9.74 7.93 13.25 17.60 31.81 58.03 115.56 184.10 112.04 31.19 17.07 12.46 50.96 9.25 9.71 15.17 21.87 33.30 80.35 122.20 154.13 84.06 21.23 14.55 10.93 10.53 7.31 8.20 11.41 16.54 40.56 112.44 133.37 148.16 40.93 19.70 14.31 1964 9.68 7.81 8.97 14.67 19.11 44.39 112.77 137.02 112.29 34.43 16.89 12.58 44.23 9.19 8.51 10.28 18.23 20.00 61.47 119.25 114.71 84.25 23.44 14.40 11.04 10.86 8.47 11.92 14.87 20.82 43.19 75.01 93.15 86.59 24.55 15.16 11.40 1965 9.98 9.04 13.03 19.12 24.05 47.27 75.24 95.70 65.62 20.65 13.00 10.02 33.76 9.48 11.07 14.93 23.76 25.18 65.45 79.56 80.12 49.24 14.06 11.08 8.79 8.43 7.06 7.62 7.86 19.07 42.50 85.03 145.77 97.11 25.31 14.81 11.05 1966 7.75 7.54 8.33 10.10 22.03 46.52 85.29 149.75 73.59 21.29 12.70 9.72 37.89 7.36 9.24 9.54 12.56 23.06 64.42 90.19 125.38 55.22 14.50 10.82 8.52 8.37 6.00 6.45 7.60 13.13 36.93 92.27 149.92 118.88 32.62 17.43 13.06 1967 7.69 6.41 7.05 9.78 15.17 40.42 92.55 154.02 90.10 27.44 14.94 11.48 39.72 7.30 7.85 8.07 12.15 15.88 55.97 97.86 128.95 67.60 18.68 12.74 10.07 10.99 8.30 12.31 11.91 24.61 54.22 113.43 143.66 102.33 35.69 18.42 13.06 1968 10.11 8.87 13.46 15.32 28.44 59.35 113.76 147.59 77.55 30.02 15.79 11.48 44.38 9.59 9.65 15.42 19.04 29.77 82.18 120.30 123.56 58.19 20.44 13.47 10.07 10.86 7.92 10.45 12.00 30.26 48.55 93.32 138.71 155.01 45.55 21.40 14.45 1969 9.98 8.46 11.43 15.43 34.96 53.14 93.60 142.51 117.48 38.31 18.35 12.71 46.46 9.48 10.36 13.09 19.17 36.59 73.58 98.98 119.31 88.15 26.08 15.64 11.14 11.26 8.25 10.16 12.59 21.01 50.28 122.77 137.46 108.93 42.01 20.91 14.80 1970 10.35 8.81 11.11 16.19 24.28 55.03 123.13 141.22 82.56 35.33 17.92 13.01 45.11 9.82 10.79 12.72 20.12 25.42 76.21 130.21 118.23 61.94 24.06 15.28 11.41 11.39 8.69 12.99 16.90 22.57 81.13 129.88 165.22 151.42 46.86 25.52 17.30 1971 10.47 9.28 14.21 21.73 26.08 88.80 130.27 169.74 114.76 39.41 21.88 15.21 55.52 9.94 11.36 16.27 27.01 27.30 122.96 137.75 142.11 86.10 26.83 18.65 13.34 12.90 10.93 14.26 13.27 31.52 42.08 94.62 106.14 128.18 34.23 19.77 13.83 1972 11.86 11.67 15.60 17.06 36.42 46.06 94.90 109.04 97.14 28.79 16.95 12.16 41.56 11.26 12.71 17.86 21.20 38.12 63.78 100.36 91.29 72.89 19.60 14.45 10.66

5-15 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 11.59 8.85 15.04 19.69 37.75 66.58 118.50 132.18 140.58 93.24 28.22 17.37 1973 10.65 9.45 16.45 25.32 43.61 72.87 118.85 135.80 106.54 78.42 24.19 15.27 55.01 10.11 11.58 18.84 31.46 45.66 100.90 125.68 113.69 79.94 53.39 20.63 13.39 13.10 9.40 11.43 13.77 19.36 38.61 82.00 132.12 102.57 36.93 19.20 13.97 1974 12.04 10.04 12.50 17.71 22.37 42.26 82.25 135.73 77.74 31.06 16.46 12.28 39.38 11.43 12.30 14.31 22.01 23.41 58.52 86.97 113.64 58.33 21.15 14.04 10.77 11.65 9.34 13.19 18.50 34.54 86.92 117.82 144.78 156.72 50.56 23.32 16.33 1975 10.71 9.98 14.42 23.79 39.90 95.13 118.17 148.74 118.78 42.52 19.99 14.35 55.15 10.17 12.22 16.52 29.57 41.77 131.72 124.96 124.53 89.12 28.95 17.04 12.59 12.05 9.23 11.33 13.27 27.73 44.08 78.79 116.82 118.15 30.93 17.50 12.72 1976 11.07 9.86 12.39 17.06 32.04 48.25 79.02 120.02 89.54 26.01 15.00 11.18 39.30 10.51 10.74 14.19 21.20 33.53 66.81 83.56 100.48 67.18 17.71 12.79 9.80 8.17 8.56 7.78 12.45 16.74 36.97 83.29 118.71 89.13 45.93 21.41 14.40 1977 8.56 8.56 9.34 11.29 20.63 26.85 96.13 133.11 80.18 34.25 19.85 12.84 38.54 8.95 8.17 10.90 13.23 29.58 65.00 79.79 109.75 67.72 28.02 17.90 15.96 13.23 17.51 11.68 14.40 43.20 60.72 117.15 183.70 108.98 42.81 14.79 9.34 1978 10.51 29.58 14.40 26.47 56.43 58.77 111.70 174.75 83.29 31.14 12.84 8.17 50.88 9.73 10.51 12.84 28.41 56.05 100.41 116.37 132.33 61.88 20.63 11.68 7.39 6.23 5.45 6.23 12.07 27.24 18.68 46.32 61.88 40.48 18.68 11.29 7.01 1979 5.84 5.45 7.01 17.51 28.41 24.91 48.65 65.00 25.30 15.18 8.56 6.23 21.96 5.45 5.45 8.56 24.52 24.13 39.70 62.66 50.99 18.68 11.68 7.78 6.62 6.23 5.06 5.84 8.56 18.68 28.41 70.06 74.73 46.70 20.63 11.29 7.39 1980 5.84 5.06 5.45 10.90 19.07 28.80 66.55 71.22 36.97 17.51 10.12 7.01 25.05 7.01 11.29 7.01 15.18 19.46 38.14 70.06 80.18 31.53 14.01 8.95 6.62 5.84 5.45 5.84 8.56 29.97 48.65 148.68 191.10 96.52 46.32 20.24 13.62 1981 5.45 5.45 5.45 14.01 34.25 47.09 83.68 181.76 65.00 29.19 17.12 11.68 47.13 5.84 5.45 7.39 15.57 43.59 101.97 92.63 200.44 40.09 23.35 15.18 10.51 8.95 8.17 10.51 21.02 35.42 58.77 110.53 175.92 123.77 34.25 16.74 9.34 1982 7.78 8.56 12.45 22.57 33.47 94.58 135.05 184.87 93.80 33.86 14.40 8.56 52.91 11.29 7.01 27.24 26.08 35.81 82.90 165.41 175.92 52.93 20.63 11.29 8.17 7.01 6.62 6.62 12.84 35.81 66.94 109.37 149.45 164.63 67.72 25.30 14.79 1983 6.62 6.23 8.56 15.57 57.60 47.48 87.57 150.62 151.01 44.37 21.80 12.84 53.37 7.01 5.84 11.68 24.91 52.54 82.90 130.38 158.79 94.58 33.08 17.90 11.68 10.51 8.17 11.68 15.18 35.81 117.93 143.23 119.87 145.17 22.57 14.40 11.29 1984 9.73 8.56 12.45 18.29 46.32 106.25 101.58 119.87 82.12 21.41 12.84 10.51 50.29 10.12 9.34 17.12 19.46 63.05 95.35 160.74 132.72 42.42 22.96 11.68 9.34

5-25 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 10.12 8.56 10.51 10.90 18.29 30.36 106.25 130.38 137.00 61.10 37.75 17.12 1985 8.56 8.56 9.34 13.23 20.63 49.43 135.05 187.60 98.08 101.97 27.24 14.79 51.97 8.56 9.34 10.90 15.96 35.81 56.05 142.45 161.91 77.45 49.82 20.24 15.18 13.62 10.12 10.51 13.23 31.91 44.37 119.48 182.15 85.62 49.04 29.19 19.07 1986 12.07 10.51 10.90 21.02 44.76 94.97 210.95 154.90 68.11 41.64 25.69 18.29 55.00 11.29 10.51 12.45 26.08 37.75 122.60 199.27 101.19 54.88 32.69 21.80 15.96 14.01 12.45 13.23 20.24 32.30 61.49 70.45 111.31 112.09 49.43 27.24 17.51 1987 13.62 13.62 14.01 19.46 25.69 61.10 73.56 119.48 88.74 38.53 25.30 12.45 44.44 13.23 13.62 17.12 28.80 39.31 59.94 108.59 123.77 71.61 34.25 20.63 11.68 12.84 11.68 14.01 21.80 42.42 61.88 114.81 141.28 88.35 69.67 29.97 15.18 1988 12.45 11.68 18.29 33.08 50.21 58.38 126.10 142.84 83.68 54.88 26.47 13.23 53.38 12.07 11.68 19.07 38.14 57.21 82.12 145.17 125.71 93.80 38.92 21.80 12.84 11.92 6.99 9.67 10.90 28.02 45.76 86.77 143.06 123.29 32.69 17.22 11.95 1989 10.95 7.46 10.58 14.01 32.37 50.09 87.02 146.98 93.43 27.50 14.76 10.51 42.19 10.40 9.14 12.11 17.42 33.89 69.36 92.02 123.05 70.11 18.72 12.59 9.22 8.76 6.60 13.48 17.15 42.32 52.81 123.45 152.82 130.30 36.54 17.36 11.95 1990 8.05 7.05 14.74 22.06 48.90 57.80 123.81 157.00 98.75 30.74 14.88 10.51 49.70 7.64 8.64 16.88 27.41 51.19 80.03 130.93 131.44 74.09 20.93 12.69 9.22 10.14 7.10 11.33 15.21 37.85 54.75 99.94 145.90 115.13 29.16 14.95 10.50 1991 9.32 7.58 12.39 19.56 43.73 59.92 100.24 149.89 87.25 24.52 12.82 9.23 44.85 8.85 9.28 14.19 24.31 45.77 82.98 106.00 125.49 65.47 16.70 10.93 8.09 8.04 6.72 7.13 9.38 21.11 41.03 76.56 155.52 132.18 30.46 14.60 9.39 1992 7.39 7.18 7.80 12.06 24.39 44.91 76.79 159.78 100.17 25.62 12.51 8.25 40.39 7.01 7.82 8.93 14.99 25.53 62.19 81.20 133.77 75.16 17.45 10.67 7.24 10.48 8.52 10.70 13.84 28.12 52.11 101.80 139.95 118.35 41.37 20.22 13.30 Average 9.62 9.31 11.79 17.90 32.89 57.14 103.17 143.80 90.26 35.43 17.32 11.67 45.31 9.42 9.88 14.02 22.20 35.61 77.83 113.09 124.98 67.41 24.58 14.68 10.63

10.86 8.47 11.92 14.87 20.82 43.19 75.01 93.15 86.59 24.55 15.16 11.40 90% Dependable 9.98 9.04 13.03 19.12 24.05 47.27 75.24 95.70 65.62 20.65 13.00 10.02 33.76 Year 9.48 11.07 14.93 23.76 25.18 65.45 79.56 80.12 49.24 14.06 11.08 8.79

11.26 8.25 10.16 12.59 21.01 50.28 122.77 137.46 108.93 42.01 20.91 14.80 10.35 8.81 11.11 16.19 24.28 55.03 123.13 141.22 82.56 35.33 17.92 13.01 45.11 50% Dependable Year 9.82 10.79 12.72 20.12 25.42 76.21 130.21 118.23 61.94 24.06 15.28 11.41

5-35 Table - 5.3 Mean Ten Daily Runoff at Mapang Bogudiyar ( Site no 9) on Goriganga

Catchment Area = 829 Sq. Km Unit : Cumecs

5-45 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 11.59 8.85 15.04 19.69 37.75 66.58 118.50 132.18 140.58 93.24 28.22 17.37 1973 10.65 9.45 16.45 25.32 43.61 72.87 118.85 135.80 106.54 78.42 24.19 15.27 55.01 10.11 11.58 18.84 31.46 45.66 100.90 125.68 113.69 79.94 53.39 20.63 13.39 13.10 9.40 11.43 13.77 19.36 38.61 82.00 132.12 102.57 36.93 19.20 13.97 1974 12.04 10.04 12.50 17.71 22.37 42.26 82.25 135.73 77.74 31.06 16.46 12.28 39.38 11.43 12.30 14.31 22.01 23.41 58.52 86.97 113.64 58.33 21.15 14.04 10.77 11.65 9.34 13.19 18.50 34.54 86.92 117.82 144.78 156.72 50.56 23.32 16.33 1975 10.71 9.98 14.42 23.79 39.90 95.13 118.17 148.74 118.78 42.52 19.99 14.35 55.15 10.17 12.22 16.52 29.57 41.77 131.72 124.96 124.53 89.12 28.95 17.04 12.59 12.05 9.23 11.33 13.27 27.73 44.08 78.79 116.82 118.15 30.93 17.50 12.72 1976 11.07 9.86 12.39 17.06 32.04 48.25 79.02 120.02 89.54 26.01 15.00 11.18 39.30 10.51 10.74 14.19 21.20 33.53 66.81 83.56 100.48 67.18 17.71 12.79 9.80 8.17 8.56 7.78 12.45 16.74 36.97 83.29 118.71 89.13 45.93 21.41 14.40 1977 8.56 8.56 9.34 11.29 20.63 26.85 96.13 133.11 80.18 34.25 19.85 12.84 38.54 8.95 8.17 10.90 13.23 29.58 65.00 79.79 109.75 67.72 28.02 17.90 15.96 13.23 17.51 11.68 14.40 43.20 60.72 117.15 183.70 108.98 42.81 14.79 9.34 1978 10.51 29.58 14.40 26.47 56.43 58.77 111.70 174.75 83.29 31.14 12.84 8.17 50.88 9.73 10.51 12.84 28.41 56.05 100.41 116.37 132.33 61.88 20.63 11.68 7.39 6.23 5.45 6.23 12.07 27.24 18.68 46.32 61.88 40.48 18.68 11.29 7.01 1979 5.84 5.45 7.01 17.51 28.41 24.91 48.65 65.00 25.30 15.18 8.56 6.23 21.96 5.45 5.45 8.56 24.52 24.13 39.70 62.66 50.99 18.68 11.68 7.78 6.62 6.23 5.06 5.84 8.56 18.68 28.41 70.06 74.73 46.70 20.63 11.29 7.39 1980 5.84 5.06 5.45 10.90 19.07 28.80 66.55 71.22 36.97 17.51 10.12 7.01 25.05 7.01 11.29 7.01 15.18 19.46 38.14 70.06 80.18 31.53 14.01 8.95 6.62 5.84 5.45 5.84 8.56 29.97 48.65 148.68 191.10 96.52 46.32 20.24 13.62 1981 5.45 5.45 5.45 14.01 34.25 47.09 83.68 181.76 65.00 29.19 17.12 11.68 47.13 5.84 5.45 7.39 15.57 43.59 101.97 92.63 200.44 40.09 23.35 15.18 10.51 8.95 8.17 10.51 21.02 35.42 58.77 110.53 175.92 123.77 34.25 16.74 9.34 1982 7.78 8.56 12.45 22.57 33.47 94.58 135.05 184.87 93.80 33.86 14.40 8.56 52.91 11.29 7.01 27.24 26.08 35.81 82.90 165.41 175.92 52.93 20.63 11.29 8.17 7.01 6.62 6.62 12.84 35.81 66.94 109.37 149.45 164.63 67.72 25.30 14.79 1983 6.62 6.23 8.56 15.57 57.60 47.48 87.57 150.62 151.01 44.37 21.80 12.84 53.37 7.01 5.84 11.68 24.91 52.54 82.90 130.38 158.79 94.58 33.08 17.90 11.68 10.51 8.17 11.68 15.18 35.81 117.93 143.23 119.87 145.17 22.57 14.40 11.29 1984 9.73 8.56 12.45 18.29 46.32 106.25 101.58 119.87 82.12 21.41 12.84 10.51 50.29 10.12 9.34 17.12 19.46 63.05 95.35 160.74 132.72 42.42 22.96 11.68 9.34

5-55 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 10.12 8.56 10.51 10.90 18.29 30.36 106.25 130.38 137.00 61.10 37.75 17.12 1985 8.56 8.56 9.34 13.23 20.63 49.43 135.05 187.60 98.08 101.97 27.24 14.79 51.97 8.56 9.34 10.90 15.96 35.81 56.05 142.45 161.91 77.45 49.82 20.24 15.18 13.62 10.12 10.51 13.23 31.91 44.37 119.48 182.15 85.62 49.04 29.19 19.07 1986 12.07 10.51 10.90 21.02 44.76 94.97 210.95 154.90 68.11 41.64 25.69 18.29 55.00 11.29 10.51 12.45 26.08 37.75 122.60 199.27 101.19 54.88 32.69 21.80 15.96 14.01 12.45 13.23 20.24 32.30 61.49 70.45 111.31 112.09 49.43 27.24 17.51 1987 13.62 13.62 14.01 19.46 25.69 61.10 73.56 119.48 88.74 38.53 25.30 12.45 44.44 13.23 13.62 17.12 28.80 39.31 59.94 108.59 123.77 71.61 34.25 20.63 11.68 12.84 11.68 14.01 21.80 42.42 61.88 114.81 141.28 88.35 69.67 29.97 15.18 1988 12.45 11.68 18.29 33.08 50.21 58.38 126.10 142.84 83.68 54.88 26.47 13.23 53.38 12.07 11.68 19.07 38.14 57.21 82.12 145.17 125.71 93.80 38.92 21.80 12.84 11.92 6.99 9.67 10.90 28.02 45.76 86.77 143.06 123.29 32.69 17.22 11.95 1989 10.95 7.46 10.58 14.01 32.37 50.09 87.02 146.98 93.43 27.50 14.76 10.51 42.19 10.40 9.14 12.11 17.42 33.89 69.36 92.02 123.05 70.11 18.72 12.59 9.22 8.76 6.60 13.48 17.15 42.32 52.81 123.45 152.82 130.30 36.54 17.36 11.95 1990 8.05 7.05 14.74 22.06 48.90 57.80 123.81 157.00 98.75 30.74 14.88 10.51 49.70 7.64 8.64 16.88 27.41 51.19 80.03 130.93 131.44 74.09 20.93 12.69 9.22 10.14 7.10 11.33 15.21 37.85 54.75 99.94 145.90 115.13 29.16 14.95 10.50 1991 9.32 7.58 12.39 19.56 43.73 59.92 100.24 149.89 87.25 24.52 12.82 9.23 44.85 8.85 9.28 14.19 24.31 45.77 82.98 106.00 125.49 65.47 16.70 10.93 8.09 8.04 6.72 7.13 9.38 21.11 41.03 76.56 155.52 132.18 30.46 14.60 9.39 1992 7.39 7.18 7.80 12.06 24.39 44.91 76.79 159.78 100.17 25.62 12.51 8.25 40.39 7.01 7.82 8.93 14.99 25.53 62.19 81.20 133.77 75.16 17.45 10.67 7.24 10.48 8.52 10.70 13.84 28.12 52.11 101.80 139.95 118.35 41.37 20.22 13.30 Average 9.62 9.31 11.79 17.90 32.89 57.14 103.17 143.80 90.26 35.43 17.32 11.67 45.31 9.42 9.88 14.02 22.20 35.61 77.83 113.09 124.98 67.41 24.58 14.68 10.63

5-65 Table - 5.3 Mean Ten Daily Runoff at Sirkari Bhyol Bogudiya ( Site no 13) on Goriganga

Catchment Area = 935 Sq. Km Unit : Cumecs Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 16.48 13.08 20.60 20.11 31.82 64.54 110.84 205.53 188.45 55.28 24.62 16.54 1962 15.15 13.97 22.53 25.86 36.77 70.64 111.17 211.15 142.82 46.50 21.11 14.54 61.04 14.38 17.11 25.80 32.13 38.49 97.81 117.55 176.78 107.16 31.66 17.99 12.75 11.96 8.37 13.66 15.44 31.05 59.79 129.95 202.11 166.74 41.82 22.46 15.99 1963 10.99 8.94 14.94 19.85 35.88 65.44 130.34 207.64 126.36 35.18 19.25 14.05 57.48 10.43 10.95 17.11 24.67 37.56 90.62 137.83 173.84 94.81 23.95 16.42 12.33 11.88 8.25 9.25 12.86 18.65 45.75 126.81 150.42 167.11 46.16 22.22 16.15 1964 10.92 8.81 10.12 16.54 21.55 50.07 127.19 154.54 126.64 38.83 19.05 14.19 49.88 10.37 9.59 11.59 20.56 22.56 69.33 134.50 129.38 95.02 26.44 16.24 12.45 12.25 9.55 13.44 16.77 23.48 48.71 84.60 105.06 97.66 27.69 17.10 12.86 1965 11.26 10.20 14.70 21.57 27.13 53.31 84.86 107.93 74.01 23.29 14.66 11.30 38.08 10.69 12.49 16.83 26.80 28.40 73.82 89.73 90.36 55.53 15.85 12.50 9.91 9.51 7.97 8.59 8.86 21.51 47.94 95.91 164.40 109.52 28.55 16.70 12.46 1966 8.74 8.51 9.40 11.39 24.85 52.47 96.19 168.90 83.00 24.02 14.32 10.96 42.74 8.30 10.42 10.76 14.16 26.01 72.65 101.72 141.41 62.28 16.35 12.21 9.61 9.44 6.77 7.27 8.58 14.81 41.66 104.07 169.09 134.08 36.79 19.66 14.74 1967 8.67 7.23 7.95 11.03 17.11 45.59 104.38 173.72 101.62 30.94 16.85 12.95 44.80 8.23 8.85 9.11 13.70 17.91 63.13 110.38 145.44 76.24 21.07 14.37 11.36 12.40 9.36 13.88 13.44 27.76 61.16 127.93 162.02 115.41 40.26 20.78 14.74 1968 11.40 10.00 15.18 17.28 32.07 66.94 128.31 166.46 87.47 33.86 17.81 12.95 50.05 10.82 10.89 17.39 21.47 33.58 92.69 135.68 139.36 65.63 23.05 15.19 11.36 12.25 8.93 11.79 13.53 34.13 54.76 105.26 156.45 174.83 51.37 24.14 16.30 1969 11.26 9.54 12.89 17.40 39.43 59.93 105.57 160.73 132.50 43.21 20.69 14.33 52.40 10.69 11.68 14.76 21.62 41.27 82.99 111.63 134.56 99.42 29.42 17.64 12.57 12.70 9.30 11.46 14.20 23.70 56.71 138.46 155.03 122.86 47.38 23.58 16.69 1970 11.67 9.93 12.53 18.26 27.38 62.07 138.88 159.28 93.11 39.85 20.21 14.67 50.88 11.08 12.17 14.35 22.69 28.66 85.95 146.85 133.35 69.86 27.13 17.23 12.87 12.85 9.80 14.65 19.06 25.46 91.51 146.49 186.34 170.78 52.85 28.78 19.52 1971 11.81 10.46 16.03 24.51 29.41 100.16 146.92 191.44 129.43 44.45 24.68 17.16 62.62 11.21 12.81 18.35 30.46 30.79 138.69 155.36 160.28 97.11 30.27 21.04 15.05 14.55 12.33 16.09 14.96 35.55 47.46 106.72 119.71 144.57 38.61 22.30 15.60 1972 13.38 13.16 17.59 19.24 41.08 51.95 107.04 122.99 109.56 32.48 19.12 13.71 46.88 12.70 14.33 20.15 23.91 43.00 71.94 113.19 102.96 82.21 22.11 16.30 12.02 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 13.07 9.98 16.97 22.21 42.58 75.09 133.65 149.08 158.55 105.16 31.83 19.59 1973 12.01 10.66 18.56 28.55 49.19 82.18 134.05 153.16 120.16 88.45 27.29 17.22 62.05 11.40 13.06 21.25 35.49 51.49 113.80 141.75 128.23 90.16 60.22 23.26 15.11 14.77 10.60 12.89 15.53 21.84 43.55 92.49 149.01 115.69 41.65 21.66 15.75 1974 13.58 11.32 14.10 19.97 25.23 47.67 92.76 153.09 87.68 35.03 18.57 13.85 44.42 12.89 13.87 16.14 24.82 26.41 66.01 98.09 128.17 65.78 23.85 15.83 12.14 13.14 10.54 14.87 20.87 38.95 98.03 132.88 163.29 176.76 57.02 26.30 18.42 1975 12.08 11.26 16.27 26.84 45.01 107.29 133.28 167.76 133.96 47.96 22.55 16.19 62.20 11.47 13.79 18.63 33.35 47.11 148.57 140.94 140.45 100.51 32.65 19.22 14.20 13.59 10.42 12.78 14.96 31.27 49.72 88.86 131.76 133.26 34.88 19.74 14.34 1976 12.49 11.12 13.98 19.24 36.13 54.42 89.13 135.36 100.99 29.34 16.92 12.61 44.33 11.86 12.11 16.01 23.91 37.82 75.35 94.25 113.33 75.77 19.97 14.43 11.06 9.22 9.66 8.78 14.05 18.88 41.70 93.94 133.88 100.52 51.80 24.14 16.24 1977 9.66 9.66 10.54 12.73 23.27 30.29 108.42 150.13 90.43 38.63 22.39 14.49 43.47 10.10 9.22 12.29 14.92 33.36 73.31 89.99 123.79 76.38 31.61 20.19 18.00 14.92 19.75 13.17 16.24 48.73 68.48 132.13 207.19 122.91 48.29 16.68 10.54 1978 11.85 33.36 16.24 29.85 63.65 66.28 125.98 197.10 93.94 35.12 14.49 9.22 57.39 10.97 11.85 14.49 32.04 63.21 113.25 131.25 149.25 69.80 23.27 13.17 8.34 7.02 6.15 7.02 13.61 30.73 21.07 52.24 69.80 45.65 21.07 12.73 7.90 1979 6.58 6.15 7.90 19.75 32.04 28.09 54.87 73.31 28.53 17.12 9.66 7.02 24.77 6.15 6.15 9.66 27.65 27.22 44.77 70.67 57.50 21.07 13.17 8.78 7.46 7.02 5.71 6.58 9.66 21.07 32.04 79.01 84.28 52.68 23.27 12.73 8.34 1980 6.58 5.71 6.15 12.29 21.51 32.48 75.06 80.33 41.70 19.75 11.41 7.90 28.25 7.90 12.73 7.90 17.12 21.95 43.02 79.01 90.43 35.56 15.80 10.10 7.46 6.58 6.15 6.58 9.66 33.80 54.87 167.69 215.53 108.86 52.24 22.83 15.36 1981 6.15 6.15 6.15 15.80 38.63 53.12 94.38 205.00 73.31 32.92 19.31 13.17 53.15 6.58 6.15 8.34 17.56 49.16 115.01 104.47 226.07 45.21 26.34 17.12 11.85 10.10 9.22 11.85 23.70 39.95 66.28 124.67 198.41 139.59 38.63 18.88 10.54 1982 8.78 9.66 14.05 25.46 37.75 106.67 152.32 208.51 105.79 38.19 16.24 9.66 59.67 12.73 7.90 30.73 29.41 40.38 93.50 186.56 198.41 59.70 23.27 12.73 9.22 7.90 7.46 7.46 14.49 40.38 75.50 123.35 168.56 185.68 76.38 28.53 16.68 1983 7.46 7.02 9.66 17.56 64.97 53.55 98.77 169.88 170.32 50.04 24.58 14.49 60.19 7.90 6.58 13.17 28.09 59.26 93.50 147.05 179.10 106.67 37.31 20.19 13.17 11.85 9.22 13.17 17.12 40.38 133.01 161.54 135.20 163.73 25.46 16.24 12.73 1984 10.97 9.66 14.05 20.63 52.24 119.84 114.57 135.20 92.62 24.14 14.49 11.85 56.72 11.41 10.54 19.31 21.95 71.11 107.55 181.29 149.69 47.85 25.90 13.17 10.54 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 11.41 9.66 11.85 12.29 20.63 34.24 119.84 147.05 154.52 68.92 42.58 19.31 1985 9.66 9.66 10.54 14.92 23.27 55.75 152.32 211.58 110.62 115.01 30.73 16.68 58.62 9.66 10.54 12.29 18.00 40.38 63.21 160.66 182.61 87.35 56.19 22.83 17.12 15.36 11.41 11.85 14.92 36.00 50.04 134.76 205.44 96.57 55.31 32.92 21.51 1986 13.61 11.85 12.29 23.70 50.48 107.11 237.92 174.71 76.82 46.97 28.97 20.63 62.03 12.73 11.85 14.05 29.41 42.58 138.27 224.75 114.13 61.89 36.87 24.58 18.00 15.80 14.05 14.92 22.83 36.43 69.36 79.45 125.54 126.42 55.75 30.73 19.75 1987 15.36 15.36 15.80 21.95 28.97 68.92 82.96 134.76 100.08 43.46 28.53 14.05 50.12 14.92 15.36 19.31 32.48 44.34 67.60 122.47 139.59 80.77 38.63 23.27 13.17 14.49 13.17 15.80 24.58 47.85 69.80 129.50 159.35 99.65 78.58 33.80 17.12 1988 14.05 13.17 20.63 37.31 56.63 65.85 142.23 161.10 94.38 61.89 29.85 14.92 60.20 13.61 13.17 21.51 43.02 64.53 92.62 163.73 141.79 105.79 43.90 24.58 14.49 13.44 7.88 10.91 12.29 31.60 51.61 97.86 161.35 139.05 36.87 19.42 13.48 1989 12.35 8.41 11.93 15.81 36.51 56.49 98.15 165.77 105.38 31.02 16.65 11.85 47.59 11.73 10.31 13.66 19.64 38.22 78.22 103.79 138.79 79.07 21.12 14.19 10.39 9.88 7.45 15.20 19.35 47.73 59.56 139.23 172.36 146.96 41.21 19.58 13.48 1990 9.08 7.95 16.63 24.88 55.15 65.19 139.65 177.08 111.38 34.67 16.79 11.85 56.05 8.62 9.74 19.04 30.92 57.73 90.26 147.67 148.25 83.57 23.60 14.31 10.39 11.44 8.00 12.78 17.15 42.69 61.75 112.72 164.55 129.85 32.89 16.86 11.84 1991 10.51 8.55 13.98 22.06 49.32 67.59 113.06 169.06 98.41 27.66 14.46 10.41 50.59 9.98 10.47 16.01 27.41 51.63 93.59 119.55 141.54 73.84 18.83 12.32 9.13 9.07 7.58 8.04 10.58 23.81 46.28 86.35 175.41 149.08 34.36 16.46 10.59 1992 8.33 8.10 8.79 13.60 27.51 50.65 86.61 180.21 112.98 28.90 14.11 9.31 45.55 7.91 8.82 10.07 16.90 28.80 70.14 91.58 150.87 84.77 19.68 12.03 8.16 11.82 9.60 12.07 15.61 31.72 58.77 114.81 157.85 133.48 46.66 22.81 15.00 Average 10.85 10.50 13.29 20.19 37.10 64.45 116.37 162.19 101.81 39.96 19.54 13.17 51.10 10.63 11.14 15.81 25.04 40.16 87.78 127.55 140.96 76.03 27.72 16.56 11.99

90% 12.25 9.55 13.44 16.77 23.48 48.71 84.60 105.06 97.66 27.69 17.10 12.86 Dependable 11.26 10.20 14.70 21.57 27.13 53.31 84.86 107.93 74.01 23.29 14.66 11.30 38.08 Series 10.69 12.49 16.83 26.80 28.40 73.82 89.73 90.36 55.53 15.85 12.50 9.91

50% 12.70 9.30 11.46 14.20 23.70 56.71 138.46 155.03 122.86 47.38 23.58 16.69 Dependable 11.67 9.93 12.53 18.26 27.38 62.07 138.88 159.28 93.11 39.85 20.21 14.67 50.88 Series 11.08 12.17 14.35 22.69 28.66 85.95 146.85 133.35 69.86 27.13 17.23 12.87 Table - 5.3 Mean Ten Daily Runoff at Sirkari Bhyol Rupsiabagar ( Site no 11) on Goriganga

Catchment Area = 1160 Sq. Km Unit : Cumecs Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 20.45 16.23 25.56 24.95 39.48 80.07 137.51 254.99 233.79 68.59 30.54 20.52 1962 18.79 17.33 27.96 32.08 45.61 87.63 137.92 261.96 177.18 57.69 26.19 18.03 75.73 17.84 21.23 32.01 39.87 47.75 121.35 145.84 219.32 132.94 39.28 22.32 15.82 14.83 10.39 16.95 19.15 38.53 74.18 161.22 250.74 206.86 51.88 27.86 19.84 1963 13.63 11.09 18.54 24.63 44.51 81.19 161.70 257.60 156.77 43.64 23.89 17.44 71.31 12.94 13.59 21.23 30.61 46.60 112.43 170.99 215.67 117.63 29.71 20.37 15.29 14.74 10.23 11.48 15.96 23.14 56.75 157.33 186.62 207.32 57.27 27.56 20.03 1964 13.55 10.93 12.56 20.52 26.74 62.12 157.80 191.73 157.12 48.17 23.63 17.61 61.89 12.86 11.90 14.38 25.51 27.99 86.01 166.86 160.52 117.89 32.80 20.15 15.44 15.20 11.85 16.68 20.81 29.13 60.43 104.96 130.34 121.16 34.35 21.22 15.95 1965 13.97 12.65 18.24 26.76 33.66 66.14 105.28 133.91 91.82 28.89 18.19 14.02 47.25 13.26 15.50 20.88 33.25 35.23 91.59 111.33 112.11 68.90 19.67 15.51 12.30 11.80 9.89 10.66 10.99 26.68 59.48 118.99 203.97 135.88 35.42 20.72 15.46 1966 10.85 10.56 11.66 14.14 30.83 65.10 119.34 209.55 102.98 29.79 17.76 13.59 53.02 10.30 12.93 13.35 17.57 32.27 90.14 126.20 175.44 77.27 20.29 15.15 11.92 11.71 8.39 9.02 10.64 18.38 51.68 129.11 209.78 166.35 45.64 24.39 18.28 1967 10.76 8.96 9.86 13.68 21.23 56.56 129.50 215.52 126.07 38.39 20.91 16.07 55.59 10.21 10.98 11.30 17.00 22.23 78.32 136.94 180.44 94.59 26.14 17.83 14.09 15.38 11.62 17.22 16.67 34.44 75.88 158.71 201.01 143.18 49.95 25.78 18.28 1968 14.14 12.41 18.83 21.43 39.79 83.04 159.19 206.51 108.51 42.01 22.10 16.07 62.10 13.42 13.51 21.57 26.64 41.66 114.99 168.33 172.90 81.42 28.60 18.84 14.09 15.20 11.08 14.62 16.79 42.34 67.93 130.58 194.09 216.90 63.74 29.95 20.22 1969 13.97 11.83 15.99 21.59 48.92 74.35 130.97 199.41 164.38 53.61 25.67 17.78 65.01 13.26 14.49 18.32 26.83 51.21 102.96 138.50 166.94 123.34 36.50 21.89 15.59 15.75 11.54 14.21 17.62 29.40 70.36 171.78 192.34 152.43 58.78 29.25 20.71 1970 14.48 12.32 15.55 22.65 33.97 77.01 172.30 197.60 115.52 49.44 25.08 18.21 63.12 13.74 15.10 17.80 28.15 35.56 106.63 182.19 165.44 86.68 33.66 21.38 15.97 15.94 12.15 18.18 23.65 31.58 113.53 181.74 231.18 211.88 65.57 35.71 24.21 1971 14.65 12.98 19.88 30.41 36.49 124.26 182.28 237.51 160.58 55.15 30.61 21.28 77.68 13.91 15.90 22.77 37.79 38.20 172.06 192.75 198.85 120.48 37.55 26.10 18.67 18.05 15.29 19.96 18.56 44.11 58.89 132.40 148.52 179.36 47.90 27.66 19.35 1972 16.59 16.33 21.83 23.87 50.96 64.45 132.80 152.58 135.93 40.29 23.72 17.01 58.16 15.75 17.78 24.99 29.66 53.35 89.25 140.43 127.74 101.99 27.43 20.22 14.92 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 16.21 12.38 21.05 27.55 52.82 93.16 165.81 184.96 196.70 130.46 39.48 24.31 1973 14.90 13.23 23.02 35.42 61.03 101.96 166.31 190.02 149.08 109.74 33.85 21.37 76.98 14.15 16.20 26.36 44.02 63.88 141.19 175.86 159.09 111.85 74.71 28.86 18.74 18.33 13.15 15.99 19.27 27.09 54.03 114.74 184.87 143.53 51.67 26.87 19.54 1974 16.85 14.05 17.49 24.78 31.30 59.14 115.09 189.93 108.77 43.46 23.04 17.18 55.11 15.99 17.20 20.03 30.80 32.76 81.89 121.70 159.01 81.61 29.59 19.64 15.07 16.30 13.08 18.45 25.89 48.33 121.62 164.86 202.58 219.30 70.74 32.63 22.85 1975 14.99 13.96 20.18 33.29 55.84 133.11 165.35 208.13 166.20 59.50 27.97 20.09 77.16 14.23 17.10 23.11 41.38 58.45 184.32 174.85 174.25 124.70 40.51 23.85 17.62 16.86 12.92 15.86 18.56 38.80 61.68 110.24 163.46 165.32 43.27 24.49 17.80 1976 15.49 13.80 17.34 23.87 44.83 67.51 110.57 167.94 125.29 36.40 21.00 15.64 54.99 14.71 15.03 19.86 29.66 46.92 93.48 116.93 140.60 94.01 24.78 17.90 13.72 11.44 11.98 10.89 17.43 23.42 51.74 116.54 166.10 124.71 64.26 29.95 20.15 1977 11.98 11.98 13.07 15.79 28.86 37.58 134.52 186.25 112.19 47.92 27.77 17.97 53.93 12.53 11.44 15.25 18.52 41.39 90.95 111.64 153.58 94.76 39.21 25.05 22.33 18.52 24.51 16.34 20.15 60.45 84.96 163.92 257.05 152.49 59.91 20.69 13.07 1978 14.70 41.39 20.15 37.03 78.97 82.23 156.30 244.53 116.54 43.57 17.97 11.44 71.20 13.62 14.70 17.97 39.76 78.42 140.51 162.84 185.16 86.59 28.86 16.34 10.35 8.71 7.62 8.71 16.88 38.12 26.14 64.81 86.59 56.64 26.14 15.79 9.80 1979 8.17 7.62 9.80 24.51 39.76 34.85 68.08 90.95 35.40 21.24 11.98 8.71 30.73 7.62 7.62 11.98 34.31 33.77 55.55 87.68 71.34 26.14 16.34 10.89 9.26 8.71 7.08 8.17 11.98 26.14 39.76 98.03 104.56 65.35 28.86 15.79 10.35 1980 8.17 7.08 7.62 15.25 26.69 40.30 93.13 99.66 51.74 24.51 14.16 9.80 35.05 9.80 15.79 9.80 21.24 27.23 53.37 98.03 112.19 44.11 19.61 12.53 9.26 8.17 7.62 8.17 11.98 41.93 68.08 208.04 267.40 135.06 64.81 28.32 19.06 1981 7.62 7.62 7.62 19.61 47.92 65.90 117.09 254.33 90.95 40.85 23.96 16.34 65.95 8.17 7.62 10.35 21.78 61.00 142.69 129.62 280.47 56.09 32.68 21.24 14.70 12.53 11.44 14.70 29.41 49.56 82.23 154.67 246.16 173.18 47.92 23.42 13.07 1982 10.89 11.98 17.43 31.59 46.84 132.34 188.98 258.69 131.25 47.38 20.15 11.98 74.03 15.79 9.80 38.12 36.49 50.10 116.00 231.46 246.16 74.07 28.86 15.79 11.44 9.80 9.26 9.26 17.97 50.10 93.67 153.03 209.13 230.37 94.76 35.40 20.69 1983 9.26 8.71 11.98 21.78 80.60 66.44 122.54 210.76 211.31 62.08 30.50 17.97 74.68 9.80 8.17 16.34 34.85 73.52 116.00 182.44 222.20 132.34 46.29 25.05 16.34 14.70 11.44 16.34 21.24 50.10 165.01 200.41 167.74 203.14 31.59 20.15 15.79 1984 13.62 11.98 17.43 25.60 64.81 148.68 142.14 167.74 114.91 29.95 17.97 14.70 70.37 14.16 13.07 23.96 27.23 88.23 133.43 224.92 185.71 59.36 32.13 16.34 13.07 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 14.16 11.98 14.70 15.25 25.60 42.48 148.68 182.44 191.70 85.50 52.83 23.96 1985 11.98 11.98 13.07 18.52 28.86 69.16 188.98 262.50 137.24 142.69 38.12 20.69 72.73 11.98 13.07 15.25 22.33 50.10 78.42 199.32 226.55 108.38 69.71 28.32 21.24 19.06 14.16 14.70 18.52 44.66 62.08 167.19 254.87 119.81 68.62 40.85 26.69 1986 16.88 14.70 15.25 29.41 62.63 132.88 295.17 216.75 95.31 58.27 35.94 25.60 76.96 15.79 14.70 17.43 36.49 52.83 171.55 278.84 141.60 76.79 45.75 30.50 22.33 19.61 17.43 18.52 28.32 45.20 86.05 98.57 155.76 156.85 69.16 38.12 24.51 1987 19.06 19.06 19.61 27.23 35.94 85.50 102.93 167.19 124.17 53.92 35.40 17.43 62.18 18.52 19.06 23.96 40.30 55.00 83.87 151.94 173.18 100.21 47.92 28.86 16.34 17.97 16.34 19.61 30.50 59.36 86.59 160.66 197.69 123.62 97.48 41.93 21.24 1988 17.43 16.34 25.60 46.29 70.25 81.69 176.45 199.87 117.09 76.79 37.03 18.52 74.69 16.88 16.34 26.69 53.37 80.06 114.91 203.14 175.91 131.25 54.46 30.50 17.97 16.67 9.77 13.53 15.25 39.21 64.03 121.41 200.18 172.51 45.75 24.09 16.73 1989 15.32 10.44 14.80 19.61 45.30 70.09 121.77 205.66 130.74 38.48 20.66 14.70 59.04 14.55 12.79 16.95 24.37 47.42 97.05 128.77 172.18 98.10 26.20 17.61 12.90 12.26 9.24 18.86 24.00 59.22 73.89 172.74 213.84 182.33 51.13 24.29 16.73 1990 11.27 9.87 20.63 30.86 68.42 80.87 173.25 219.69 138.18 43.01 20.83 14.70 69.54 10.70 12.08 23.62 38.36 71.62 111.98 183.20 183.93 103.68 29.28 17.75 12.90 14.19 9.93 15.86 21.28 52.96 76.61 139.85 204.15 161.10 40.80 20.92 14.69 1991 13.04 10.60 17.34 27.36 61.18 83.85 140.26 209.74 122.09 34.32 17.93 12.91 62.76 12.38 12.99 19.86 34.01 64.05 116.11 148.32 175.59 91.61 23.36 15.29 11.32 11.25 9.41 9.98 13.12 29.54 57.42 107.13 217.62 184.95 42.63 20.42 13.14 1992 10.34 10.05 10.91 16.87 34.13 62.84 107.45 223.58 140.17 35.86 17.51 11.55 56.52 9.81 10.94 12.50 20.97 35.73 87.02 113.62 187.18 105.17 24.41 14.93 10.13 14.66 11.92 14.98 19.37 39.35 72.92 142.44 195.83 165.61 57.89 28.29 18.61 Average 13.46 13.03 16.49 25.05 46.03 79.96 144.37 201.22 126.31 49.58 24.24 16.34 63.40 13.18 13.83 19.61 31.07 49.82 108.90 158.24 174.88 94.32 34.40 20.55 14.87

15.20 11.85 16.68 20.81 29.13 60.43 104.96 130.34 121.16 34.35 21.22 15.95 13.97 12.65 18.24 26.76 33.66 66.14 105.28 133.91 91.82 28.89 18.19 14.02 47.25 90% Dependable Year 13.26 15.50 20.88 33.25 35.23 91.59 111.33 112.11 68.90 19.67 15.51 12.30

15.75 11.54 14.21 17.62 29.40 70.36 171.78 192.34 152.43 58.78 29.25 20.71 50% Dependable 14.48 12.32 15.55 22.65 33.97 77.01 172.30 197.60 115.52 49.44 25.08 18.21 63.12 Year 13.74 15.10 17.80 28.15 35.56 106.63 182.19 165.44 86.68 33.66 21.38 15.97 Table - 5.3 Mean Ten Daily Runoff at khasiya Bada ( Site no 22) on Goriganga

Catchment Area =1235 Sq. Km Unit : Cumecs Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 21.77 17.28 27.21 26.56 42.03 85.24 146.40 271.47 248.91 73.02 32.52 21.84 1962 20.01 18.45 29.76 34.15 48.56 93.30 146.84 278.90 188.64 61.42 27.88 19.20 80.63 18.99 22.60 34.08 42.45 50.84 129.19 155.27 233.50 141.54 41.82 23.77 16.84 15.79 11.06 18.04 20.39 41.02 78.98 171.65 266.95 220.24 55.24 29.66 21.12 1963 14.52 11.81 19.73 26.22 47.39 86.44 172.16 274.26 166.91 46.46 25.43 18.56 75.92 13.78 14.47 22.60 32.59 49.61 119.70 182.05 229.61 125.23 31.63 21.68 16.28 15.69 10.90 12.22 16.99 24.64 60.42 167.50 198.69 220.72 60.97 29.35 21.33 1964 14.43 11.64 13.37 21.85 28.47 66.13 168.00 204.12 167.28 51.29 25.16 18.75 65.89 13.69 12.67 15.31 27.16 29.80 91.57 177.65 170.90 125.51 34.92 21.45 16.44 16.18 12.61 17.75 22.15 31.02 64.34 111.75 138.77 128.99 36.57 22.59 16.98 1965 14.88 13.47 19.42 28.49 35.83 70.42 112.08 142.57 97.76 30.76 19.37 14.93 50.30 14.12 16.50 22.24 35.40 37.51 97.51 118.52 119.36 73.35 20.94 16.51 13.09 12.56 10.52 11.35 11.70 28.41 63.32 126.68 217.15 144.67 37.71 22.06 16.46 1966 11.55 11.24 12.41 15.05 32.82 69.30 127.06 223.10 109.64 31.72 18.91 14.47 56.45 10.96 13.77 14.21 18.71 34.36 95.97 134.36 186.78 82.26 21.60 16.13 12.69 12.46 8.94 9.60 11.33 19.56 55.02 137.46 223.34 177.11 48.59 25.97 19.46 1967 11.46 9.54 10.50 14.56 22.60 60.22 137.87 229.45 134.22 40.87 22.26 17.11 59.18 10.88 11.69 12.03 18.10 23.66 83.39 145.79 192.10 100.71 27.83 18.98 15.00 16.38 12.37 18.34 17.75 36.67 80.78 168.98 214.01 152.44 53.18 27.45 19.46 1968 15.06 13.21 20.05 22.82 42.37 88.41 169.48 219.87 115.53 44.73 23.53 17.11 66.12 14.29 14.38 22.96 28.36 44.35 122.43 179.22 184.08 86.68 30.45 20.06 15.00 16.18 11.80 15.57 17.87 45.08 72.32 139.03 206.64 230.93 67.86 31.88 21.53 1969 14.88 12.60 17.03 22.98 52.08 79.16 139.44 212.30 175.01 57.08 27.33 18.93 69.21 14.12 15.43 19.50 28.56 54.52 109.61 147.45 177.74 131.31 38.86 23.30 16.60 16.77 12.29 15.13 18.76 31.31 74.91 182.89 204.78 162.28 62.58 31.14 22.05 1970 15.42 13.12 16.55 24.12 36.17 81.99 183.44 210.38 122.99 52.64 26.70 19.38 67.21 14.63 16.07 18.95 29.97 37.86 113.53 193.97 176.13 92.28 35.84 22.76 17.00 16.97 12.94 19.35 25.18 33.62 120.87 193.49 246.13 225.58 69.81 38.02 25.78 1971 15.60 13.82 21.17 32.37 38.85 132.29 194.06 252.87 170.96 58.72 32.59 22.66 82.71 14.80 16.93 24.24 40.23 40.67 183.18 205.21 211.70 128.27 39.98 27.79 19.87 19.22 16.28 21.25 19.76 46.96 62.69 140.96 158.12 190.96 51.00 29.45 20.60 1972 17.67 17.39 23.24 25.41 54.26 68.62 141.38 162.45 144.72 42.90 25.25 18.11 61.92 16.77 18.93 26.61 31.58 56.80 95.02 149.50 136.00 108.58 29.20 21.53 15.88

5-135 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 17.26 13.18 22.41 29.33 56.24 99.18 176.53 196.92 209.42 138.90 42.04 25.88 1973 15.87 14.08 24.51 37.71 64.97 108.55 177.06 202.31 158.71 116.83 36.04 22.75 81.96 15.06 17.25 28.07 46.87 68.02 150.31 187.23 169.37 119.09 79.54 30.73 19.95 19.51 14.00 17.03 20.52 28.84 57.53 122.16 196.82 152.81 55.01 28.61 20.81 1974 17.94 14.95 18.62 26.38 33.32 62.96 122.53 202.21 115.81 46.27 24.53 18.29 58.67 17.03 18.32 21.32 32.79 34.88 87.18 129.57 169.29 86.89 31.50 20.91 16.04 17.36 13.92 19.65 27.57 51.45 129.48 175.52 215.68 233.48 75.32 34.74 24.33 1975 15.96 14.87 21.49 35.45 59.45 141.72 176.04 221.58 176.95 63.35 29.78 21.39 82.15 15.15 18.21 24.61 44.05 62.23 196.24 186.15 185.51 132.76 43.13 25.39 18.75 17.95 13.76 16.88 19.76 41.31 65.67 117.37 174.03 176.01 46.07 26.07 18.95 1976 16.50 14.69 18.46 25.41 47.72 71.87 117.72 178.79 133.39 38.75 22.35 16.65 58.55 15.66 16.00 21.14 31.58 49.96 99.53 124.48 149.69 100.09 26.38 19.06 14.61 12.18 12.76 11.60 18.55 24.93 55.08 124.08 176.84 132.78 68.42 31.89 21.45 1977 12.76 12.76 13.92 16.81 30.73 40.01 143.21 198.30 119.44 51.02 29.57 19.13 57.42 13.34 12.18 16.23 19.71 44.07 96.83 118.86 163.51 100.89 41.75 26.67 23.77 19.71 26.09 17.39 21.45 64.36 90.45 174.52 273.67 162.35 63.78 22.03 13.92 1978 15.65 44.07 21.45 39.43 84.07 87.55 166.41 260.34 124.08 46.38 19.13 12.18 75.80 14.50 15.65 19.13 42.33 83.49 149.59 173.36 197.14 92.19 30.73 17.39 11.02 9.28 8.12 9.28 17.97 40.59 27.83 69.00 92.19 60.30 27.83 16.81 10.44 1979 8.70 8.12 10.44 26.09 42.33 37.11 72.48 96.83 37.69 22.61 12.76 9.28 32.72 8.12 8.12 12.76 36.53 35.95 59.14 93.35 75.96 27.83 17.39 11.60 9.86 9.28 7.54 8.70 12.76 27.83 42.33 104.37 111.32 69.58 30.73 16.81 11.02 1980 8.70 7.54 8.12 16.23 28.41 42.91 99.15 106.11 55.08 26.09 15.08 10.44 37.32 10.44 16.81 10.44 22.61 28.99 56.82 104.37 119.44 46.96 20.87 13.34 9.86 8.70 8.12 8.70 12.76 44.65 72.48 221.49 284.69 143.79 69.00 30.15 20.29 1981 8.12 8.12 8.12 20.87 51.02 70.16 124.66 270.77 96.83 43.49 25.51 17.39 70.21 8.70 8.12 11.02 23.19 64.94 151.91 138.00 298.60 59.72 34.79 22.61 15.65 13.34 12.18 15.65 31.31 52.76 87.55 164.67 262.08 184.38 51.02 24.93 13.92 1982 11.60 12.76 18.55 33.63 49.86 140.89 201.19 275.41 139.73 50.44 21.45 12.76 78.82 16.81 10.44 40.59 38.85 53.34 123.50 246.42 262.08 78.85 30.73 16.81 12.18 10.44 9.86 9.86 19.13 53.34 99.73 162.93 222.65 245.26 100.89 37.69 22.03 1983 9.86 9.28 12.76 23.19 85.81 70.74 130.46 224.39 224.97 66.10 32.47 19.13 79.51 10.44 8.70 17.39 37.11 78.27 123.50 194.24 236.56 140.89 49.28 26.67 17.39 15.65 12.18 17.39 22.61 53.34 175.68 213.37 178.58 216.27 33.63 21.45 16.81 1984 14.50 12.76 18.55 27.25 69.00 158.29 151.33 178.58 122.34 31.89 19.13 15.65 74.92 15.08 13.92 25.51 28.99 93.93 142.05 239.46 197.72 63.20 34.21 17.39 13.92

5-145 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 15.08 12.76 15.65 16.23 27.25 45.23 158.29 194.24 204.09 91.03 56.24 25.51 1985 12.76 12.76 13.92 19.71 30.73 73.64 201.19 279.47 146.11 151.91 40.59 22.03 77.43 12.76 13.92 16.23 23.77 53.34 83.49 212.21 241.20 115.38 74.22 30.15 22.61 20.29 15.08 15.65 19.71 47.54 66.10 178.00 271.35 127.56 73.06 43.49 28.41 1986 17.97 15.65 16.23 31.31 66.68 141.47 314.26 230.77 101.47 62.04 38.27 27.25 81.94 16.81 15.65 18.55 38.85 56.24 182.64 296.86 150.75 81.75 48.70 32.47 23.77 20.87 18.55 19.71 30.15 48.12 91.61 104.95 165.83 166.99 73.64 40.59 26.09 1987 20.29 20.29 20.87 28.99 38.27 91.03 109.58 178.00 132.20 57.40 37.69 18.55 66.20 19.71 20.29 25.51 42.91 58.56 89.29 161.77 184.38 106.69 51.02 30.73 17.39 19.13 17.39 20.87 32.47 63.20 92.19 171.04 210.47 131.62 103.79 44.65 22.61 1988 18.55 17.39 27.25 49.28 74.80 86.97 187.86 212.79 124.66 81.75 39.43 19.71 79.52 17.97 17.39 28.41 56.82 85.23 122.34 216.27 187.28 139.73 57.98 32.47 19.13 17.75 10.41 14.41 16.24 41.74 68.17 129.26 213.13 183.67 48.71 25.65 17.81 1989 16.32 11.11 15.75 20.88 48.23 74.62 129.64 218.96 139.19 40.97 21.99 15.65 62.86 15.49 13.61 18.04 25.95 50.48 103.32 137.09 183.32 104.44 27.89 18.75 13.73 13.05 9.84 20.08 25.55 63.05 78.67 183.90 227.66 194.11 54.44 25.86 17.81 1990 12.00 10.50 21.96 32.86 72.84 86.10 184.45 233.89 147.11 45.79 22.17 15.65 74.04 11.39 12.87 25.15 40.84 76.25 119.22 195.05 195.82 110.38 31.17 18.90 13.73 15.11 10.57 16.88 22.66 56.38 81.56 148.89 217.35 171.52 43.44 22.27 15.64 1991 13.89 11.29 18.46 29.13 65.14 89.27 149.33 223.30 129.99 36.54 19.09 13.75 66.82 13.18 13.83 21.14 36.21 68.19 123.61 157.91 186.95 97.53 24.87 16.28 12.06 11.98 10.02 10.62 13.97 31.45 61.13 114.05 231.69 196.91 45.38 21.74 13.98 1992 11.01 10.70 11.62 17.96 36.34 66.90 114.39 238.03 149.23 38.17 18.64 12.29 60.17 10.45 11.65 13.30 22.33 38.04 92.64 120.97 199.28 111.97 25.99 15.89 10.78 15.61 12.69 15.94 20.62 41.89 77.63 151.65 208.49 176.31 61.63 30.12 19.82 Average 14.33 13.87 17.56 26.67 49.00 85.13 153.70 214.23 134.47 52.79 25.81 17.39 67.50 14.04 14.72 20.88 33.08 53.04 115.94 168.47 186.19 100.42 36.62 21.88 15.84

90% 16.18 12.61 17.75 22.15 31.02 64.34 111.75 138.77 128.99 36.57 22.59 16.98 Dependable 14.88 13.47 19.42 28.49 35.83 70.42 112.08 142.57 97.76 30.76 19.37 14.93 50.30 Series 14.12 16.50 22.24 35.40 37.51 97.51 118.52 119.36 73.35 20.94 16.51 13.09

50% 16.77 12.29 15.13 18.76 31.31 74.91 182.89 204.78 162.28 62.58 31.14 22.05 Dependable 15.42 13.12 16.55 24.12 36.17 81.99 183.44 210.38 122.99 52.64 26.70 19.38 67.21 Series 14.63 16.07 18.95 29.97 37.86 113.53 193.97 176.13 92.28 35.84 22.76 17.00

5-155 Table - 5.3 Mean Ten Daily Runoff at khartoli Lumti Talli ( Site no 2) on Goriganga

Catchment Area = 1855 Sq. Km Unit : Cumecs Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 32.70 25.95 40.88 39.89 63.13 128.04 219.89 407.76 373.87 109.68 48.84 32.81 1962 30.05 27.71 44.70 51.30 72.94 140.14 220.55 418.92 283.34 92.25 41.87 28.84 121.10 28.53 33.94 51.20 63.75 76.36 194.05 233.22 350.72 212.59 62.81 35.70 25.29 23.72 16.61 27.10 30.63 61.61 118.63 257.82 400.97 330.80 82.97 44.56 31.72 1963 21.80 17.74 29.64 39.38 71.18 129.84 258.59 411.95 250.70 69.79 38.20 27.88 114.03 20.70 21.73 33.95 48.95 74.51 179.79 273.44 344.89 188.10 47.51 32.57 24.45 23.57 16.37 18.36 25.52 37.01 90.76 251.59 298.43 331.53 91.58 44.08 32.03 1964 21.67 17.48 20.08 32.82 42.76 99.33 252.34 306.60 251.25 77.03 37.79 28.16 98.97 20.57 19.03 22.99 40.79 44.76 137.55 266.84 256.69 188.52 52.45 32.22 24.69 24.31 18.94 26.67 33.28 46.59 96.64 167.85 208.43 193.75 54.93 33.93 25.51 1965 22.34 20.23 29.16 42.79 53.82 105.77 168.35 214.14 146.84 46.20 29.09 22.42 75.55 21.21 24.78 33.40 53.18 56.34 146.46 178.02 179.28 110.17 31.45 24.80 19.66 18.87 15.81 17.05 17.58 42.67 95.11 190.27 326.17 217.29 56.65 33.14 24.73 1966 17.34 16.88 18.64 22.61 49.30 104.10 190.84 335.10 164.68 47.65 28.41 21.74 84.79 16.46 20.68 21.35 28.10 51.60 144.14 201.81 280.55 123.56 32.44 24.22 19.07 18.72 13.42 14.42 17.01 29.39 82.64 206.47 335.46 266.02 72.99 39.00 29.23 1967 17.21 14.34 15.77 21.88 33.95 90.45 207.08 344.64 201.60 61.39 33.44 25.70 88.89 16.34 17.56 18.06 27.19 35.54 125.25 218.98 288.54 151.27 41.80 28.51 22.54 24.60 18.58 27.54 26.66 55.08 121.33 253.80 321.45 228.97 79.87 41.22 29.23 1968 22.61 19.84 30.12 34.28 63.63 132.80 254.56 330.24 173.53 67.18 35.34 25.70 99.31 21.47 21.60 34.49 42.60 66.61 183.89 269.19 276.49 130.20 45.74 30.13 22.54 24.31 17.72 23.39 26.85 67.70 108.63 208.82 310.38 346.86 101.92 47.89 32.34 1969 22.34 18.92 25.58 34.52 78.22 118.90 209.44 318.88 262.87 85.73 41.06 28.43 103.96 21.21 23.18 29.29 42.90 81.89 164.64 221.48 266.97 197.24 58.37 35.00 24.93 25.19 18.45 22.73 28.17 47.02 112.51 274.70 307.58 243.75 93.99 46.78 33.12 1970 23.15 19.71 24.86 36.22 54.33 123.15 275.52 316.00 184.73 79.06 40.10 29.11 100.94 21.98 24.14 28.47 45.02 56.87 170.52 291.35 264.56 138.61 53.83 34.19 25.53 25.48 19.44 29.07 37.81 50.50 181.55 290.62 369.69 338.83 104.85 57.10 38.72 1971 23.42 20.76 31.79 48.62 58.35 198.70 291.49 379.81 256.79 88.19 48.96 34.04 124.23 22.24 25.42 36.41 60.43 61.08 275.15 308.23 317.98 192.67 60.04 41.74 29.85 28.87 24.46 31.91 29.68 70.53 94.17 211.73 237.50 286.82 76.60 44.24 30.94 1972 26.54 26.12 34.90 38.17 81.49 103.07 212.36 244.00 217.37 64.43 37.93 27.20 93.00 25.19 28.44 39.97 47.44 85.31 142.72 224.56 204.28 163.10 43.87 32.34 23.86

5-165 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 25.93 19.80 33.66 44.05 84.47 148.97 265.15 295.78 314.56 208.63 63.14 38.87 1973 23.83 21.15 36.81 56.65 97.59 163.05 265.95 303.87 238.39 175.48 54.13 34.17 123.10 22.62 25.91 42.16 70.40 102.16 225.77 281.22 254.40 178.87 119.47 46.15 29.97 29.31 21.03 25.57 30.82 43.32 86.41 183.49 295.63 229.52 82.63 42.97 31.25 1974 26.94 22.46 27.97 39.63 50.05 94.57 184.04 303.72 173.94 69.50 36.84 27.47 88.12 25.57 27.51 32.03 49.25 52.39 130.95 194.61 254.28 130.51 47.32 31.41 24.10 26.07 20.91 29.51 41.41 77.28 194.49 263.63 323.96 350.69 113.13 52.18 36.54 1975 23.97 22.33 32.27 53.24 89.29 212.86 264.42 332.82 265.78 95.15 44.73 32.12 123.40 22.75 27.35 36.96 66.17 93.47 294.75 279.61 278.64 199.42 64.78 38.14 28.17 26.96 20.66 25.35 29.68 62.04 98.64 176.30 261.40 264.37 69.20 39.16 28.46 1976 24.78 22.07 27.73 38.17 71.68 107.96 176.82 268.55 200.36 58.21 33.57 25.02 87.94 23.52 24.03 31.76 47.44 75.04 149.49 186.98 224.84 150.33 39.63 28.62 21.94 18.29 19.16 17.42 27.87 37.45 82.73 186.37 265.62 199.43 102.77 47.90 32.22 1977 19.16 19.16 20.90 25.26 46.16 60.09 215.11 297.85 179.40 76.64 44.42 28.74 86.24 20.03 18.29 24.38 29.61 66.19 145.44 178.53 245.59 151.54 62.70 40.06 35.71 29.61 39.19 26.13 32.22 96.67 135.86 262.14 411.06 243.85 95.80 33.09 20.90 1978 23.51 66.19 32.22 59.22 126.28 131.50 249.95 391.03 186.37 69.67 28.74 18.29 113.86 21.77 23.51 28.74 63.58 125.41 224.69 260.40 296.10 138.47 46.16 26.13 16.55 13.93 12.19 13.93 27.00 60.96 41.80 103.64 138.47 90.57 41.80 25.26 15.68 1979 13.06 12.19 15.68 39.19 63.58 55.74 108.86 145.44 56.61 33.96 19.16 13.93 49.15 12.19 12.19 19.16 54.87 54.00 88.83 140.21 114.09 41.80 26.13 17.42 14.81 13.93 11.32 13.06 19.16 41.80 63.58 156.76 167.21 104.51 46.16 25.26 16.55 1980 13.06 11.32 12.19 24.38 42.67 64.45 148.92 159.37 82.73 39.19 22.64 15.68 56.05 15.68 25.26 15.68 33.96 43.54 85.35 156.76 179.40 70.54 31.35 20.03 14.81 13.06 12.19 13.06 19.16 67.06 108.86 332.68 427.61 215.98 103.64 45.29 30.48 1981 12.19 12.19 12.19 31.35 76.64 105.38 187.24 406.71 145.44 65.32 38.32 26.13 105.46 13.06 12.19 16.55 34.84 97.54 228.17 207.27 448.51 89.70 52.25 33.96 23.51 20.03 18.29 23.51 47.03 79.25 131.50 247.33 393.64 276.94 76.64 37.45 20.90 1982 17.42 19.16 27.87 50.51 74.90 211.63 302.20 413.67 209.88 75.77 32.22 19.16 118.38 25.26 15.68 60.96 58.35 80.12 185.50 370.13 393.64 118.44 46.16 25.26 18.29 15.68 14.81 14.81 28.74 80.12 149.79 244.72 334.42 368.39 151.54 56.61 33.09 1983 14.81 13.93 19.16 34.84 128.89 106.25 195.95 337.04 337.91 99.28 48.77 28.74 119.42 15.68 13.06 26.13 55.74 117.57 185.50 291.75 355.32 211.63 74.03 40.06 26.13 23.51 18.29 26.13 33.96 80.12 263.88 320.49 268.23 324.84 50.51 32.22 25.26 1984 21.77 19.16 27.87 40.93 103.64 237.75 227.30 268.23 183.76 47.90 28.74 23.51 112.54 22.64 20.90 38.32 43.54 141.08 213.37 359.68 296.97 94.93 51.38 26.13 20.90

5-175 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual average 22.64 19.16 23.51 24.38 40.93 67.93 237.75 291.75 306.55 136.73 84.48 38.32 1985 19.16 19.16 20.90 29.61 46.16 110.60 302.20 419.77 219.46 228.17 60.96 33.09 116.30 19.16 20.90 24.38 35.71 80.12 125.41 318.75 362.29 173.31 111.47 45.29 33.96 30.48 22.64 23.51 29.61 71.41 99.28 267.36 407.58 191.60 109.73 65.32 42.67 1986 27.00 23.51 24.38 47.03 100.15 212.50 472.02 346.62 152.41 93.19 57.48 40.93 123.07 25.26 23.51 27.87 58.35 84.48 274.33 445.90 226.43 122.80 73.15 48.77 35.71 31.35 27.87 29.61 45.29 72.28 137.60 157.63 249.08 250.82 110.60 60.96 39.19 1987 30.48 30.48 31.35 43.54 57.48 136.73 164.60 267.36 198.56 86.22 56.61 27.87 99.43 29.61 30.48 38.32 64.45 87.96 134.12 242.98 276.94 160.24 76.64 46.16 26.13 28.74 26.13 31.35 48.77 94.93 138.47 256.91 316.13 197.69 155.89 67.06 33.96 1988 27.87 26.13 40.93 74.03 112.35 130.63 282.17 319.62 187.24 122.80 59.22 29.61 119.44 27.00 26.13 42.67 85.35 128.02 183.76 324.84 281.30 209.88 87.09 48.77 28.74 26.66 15.63 21.64 24.39 62.70 102.40 194.15 320.12 275.87 73.16 38.53 26.75 1989 24.51 16.69 23.66 31.36 72.44 112.08 194.73 328.88 209.07 61.54 33.03 23.51 94.41 23.26 20.45 27.10 38.97 75.83 155.19 205.92 275.34 156.87 41.90 28.16 20.62 19.60 14.77 30.16 38.38 94.70 118.16 276.23 341.96 291.56 81.77 38.84 26.75 1990 18.02 15.78 32.99 49.35 109.41 129.32 277.05 351.31 220.97 68.77 33.30 23.51 111.21 17.10 19.32 37.78 61.34 114.54 179.08 292.97 294.13 165.79 46.82 28.39 20.62 22.69 15.88 25.35 34.03 84.69 122.51 223.63 326.46 257.62 65.24 33.45 23.49 1991 20.86 16.96 27.73 43.76 97.84 134.09 224.30 335.40 195.24 54.88 28.68 20.65 100.36 19.80 20.77 31.76 54.39 102.42 185.67 237.18 280.80 146.49 37.36 24.45 18.11 17.99 15.05 15.95 20.98 47.24 91.82 171.31 348.01 295.76 68.17 32.66 21.00 1992 16.53 16.07 17.45 26.98 54.58 100.49 171.82 357.53 224.15 57.34 28.00 18.46 90.38 15.69 17.50 19.98 33.54 57.13 139.15 181.69 299.33 168.18 39.04 23.87 16.19 23.45 19.06 23.95 30.97 62.92 116.60 227.78 313.16 264.83 92.57 45.24 29.77 Average 21.53 20.83 26.37 40.05 73.60 127.87 230.86 321.78 201.98 79.29 38.77 26.12 101.39 21.08 22.11 31.36 49.68 79.67 174.15 253.05 279.65 150.83 55.00 32.86 23.79

24.31 18.94 26.67 33.28 46.59 96.64 167.85 208.43 193.75 54.93 33.93 25.51 90% 22.34 20.23 29.16 42.79 53.82 105.77 168.35 214.14 146.84 46.20 29.09 22.42 75.55 Dependable Year 21.21 24.78 33.40 53.18 56.34 146.46 178.02 179.28 110.17 31.45 24.80 19.66

50% 25.19 18.45 22.73 28.17 47.02 112.51 274.70 307.58 243.75 93.99 46.78 33.12 Dependable 23.15 19.71 24.86 36.22 54.33 123.15 275.52 316.00 184.73 79.06 40.10 29.11 100.94 Year 21.98 24.14 28.47 45.02 56.87 170.52 291.35 264.56 138.61 53.83 34.19 25.53

5-185 Table - 5.3 Mean Ten Daily Runoff -Chiphaltara (Proposed Garjia Dam on Goriganga)

Catchment Area = 2130 Sq. Km Unit : Cumecs Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Average 37.55 29.79 46.94 45.81 72.49 147.02 252.49 468.21 429.29 125.94 56.08 37.67 1962 34.51 31.82 51.33 58.90 83.75 160.91 253.25 481.02 325.34 105.93 48.08 33.12 139.06 32.76 38.97 58.79 73.21 87.68 222.82 267.80 402.72 244.11 72.12 40.99 29.04 27.24 19.08 31.12 35.17 70.74 136.22 296.04 460.42 379.84 95.27 51.16 36.42 1963 25.03 20.37 34.04 45.22 81.73 149.09 296.92 473.02 287.87 80.13 43.86 32.02 130.93 23.76 24.95 38.98 56.20 85.56 206.44 313.98 396.02 215.99 54.56 37.40 28.08 27.07 18.79 21.08 29.31 42.49 104.21 288.89 342.67 380.68 105.16 50.61 36.78 1964 24.88 20.07 23.05 37.68 49.09 114.06 289.75 352.05 288.50 88.45 43.39 32.33 113.64 23.62 21.85 26.40 46.83 51.39 157.94 306.40 294.74 216.47 60.22 37.00 28.36 27.91 21.75 30.62 38.21 53.49 110.96 192.74 239.33 222.47 63.07 38.96 29.29 1965 25.66 23.23 33.49 49.13 61.80 121.45 193.31 245.88 168.60 53.05 33.40 25.75 86.75 24.35 28.46 38.35 61.06 64.70 168.17 204.42 205.86 126.51 36.12 28.48 22.58 21.67 18.15 19.57 20.19 48.99 109.21 218.48 374.52 249.50 65.04 38.05 28.40 1966 19.91 19.39 21.41 25.96 56.60 119.53 219.13 384.77 189.09 54.71 32.62 24.96 97.36 18.90 23.74 24.52 32.26 59.25 165.51 231.72 322.14 141.88 37.25 27.81 21.89 21.50 15.41 16.56 19.54 33.74 94.89 237.08 385.20 305.45 83.81 44.78 33.57 1967 19.76 16.46 18.11 25.12 38.99 103.86 237.78 395.74 231.49 70.49 38.40 29.51 102.07 18.76 20.16 20.74 31.22 40.81 143.82 251.44 331.32 173.69 47.99 32.73 25.88 28.25 21.33 31.62 30.61 63.24 139.32 291.43 369.10 262.92 91.71 47.33 33.57 1968 25.97 22.78 34.58 39.36 73.07 152.49 292.30 379.20 199.25 77.14 40.58 29.51 114.03 24.65 24.80 39.61 48.92 76.49 211.15 309.09 317.47 149.50 52.52 34.60 25.88 27.91 20.34 26.85 30.83 77.74 124.74 239.78 356.40 398.28 117.03 54.99 37.14 1969 25.66 21.73 29.37 39.64 89.82 136.53 240.49 366.15 301.84 98.44 47.14 32.65 119.37 24.35 26.61 33.63 49.26 94.02 189.05 254.31 306.55 226.48 67.02 40.19 28.63 28.92 21.19 26.10 32.35 53.99 129.19 315.43 353.18 279.89 107.93 53.71 38.03 1970 26.59 22.63 28.55 41.59 62.38 141.40 316.37 362.84 212.12 90.78 46.05 33.43 115.91 25.24 27.72 32.69 51.69 65.30 195.80 334.55 303.78 159.15 61.81 39.26 29.32 29.26 22.32 33.38 43.42 57.99 208.46 333.71 424.50 389.06 120.40 65.57 44.46 1971 26.90 23.83 36.51 55.83 67.00 228.16 334.70 436.12 294.85 101.27 56.21 39.08 142.65 25.53 29.19 41.81 69.39 70.14 315.94 353.93 365.12 221.23 68.95 47.93 34.27 33.15 28.08 36.64 34.08 80.99 108.13 243.12 272.71 329.34 87.96 50.80 35.53 1972 30.47 29.99 40.08 43.83 93.57 118.35 243.84 280.17 249.60 73.98 43.55 31.23 106.79 28.92 32.65 45.89 54.47 97.96 163.87 257.85 234.56 187.28 50.37 37.13 27.39

5-195 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Average 29.77 22.74 38.65 50.59 96.99 171.06 304.46 339.62 361.19 239.56 72.50 44.64 1973 27.36 24.29 42.27 65.04 112.06 187.22 305.37 348.92 273.73 201.50 62.16 39.24 141.35 25.97 29.75 48.41 80.84 117.31 259.25 322.91 292.12 205.39 137.19 52.99 34.41 33.66 24.15 29.36 35.39 49.74 99.22 210.69 339.46 263.54 94.88 49.34 35.89 1974 30.94 25.79 32.11 45.50 57.47 108.59 211.32 348.74 199.73 79.80 42.30 31.55 101.19 29.37 31.59 36.78 56.55 60.16 150.37 223.46 291.97 149.86 54.33 36.06 27.67 29.94 24.01 33.88 47.55 88.74 223.32 302.71 371.98 402.68 129.90 59.91 41.96 1975 27.52 25.64 37.06 61.14 102.53 244.42 303.62 382.16 305.18 109.26 51.36 36.88 141.69 26.12 31.41 42.44 75.98 107.33 338.45 321.06 319.95 228.98 74.39 43.79 32.35 30.95 23.73 29.11 34.08 71.24 113.26 202.43 300.15 303.57 79.46 44.97 32.68 1976 28.45 25.34 31.84 43.83 82.31 123.96 203.03 308.37 230.06 66.83 38.55 28.72 100.98 27.01 27.59 36.46 54.47 86.16 171.65 214.70 258.17 172.62 45.50 32.87 25.19 21.00 22.00 20.00 32.00 43.00 95.00 214.00 305.00 229.00 118.00 55.00 37.00 1977 22.00 22.00 24.00 29.00 53.00 69.00 247.00 342.00 206.00 88.00 51.00 33.00 99.03 23.00 21.00 28.00 34.00 76.00 167.00 205.00 282.00 174.00 72.00 46.00 41.00 34.00 45.00 30.00 37.00 111.00 156.00 301.00 472.00 280.00 110.00 38.00 24.00 1978 27.00 76.00 37.00 68.00 145.00 151.00 287.00 449.00 214.00 80.00 33.00 21.00 130.74 25.00 27.00 33.00 73.00 144.00 258.00 299.00 340.00 159.00 53.00 30.00 19.00 16.00 14.00 16.00 31.00 70.00 48.00 119.00 159.00 104.00 48.00 29.00 18.00 1979 15.00 14.00 18.00 45.00 73.00 64.00 125.00 167.00 65.00 39.00 22.00 16.00 56.44 14.00 14.00 22.00 63.00 62.00 102.00 161.00 131.00 48.00 30.00 20.00 17.00 16.00 13.00 15.00 22.00 48.00 73.00 180.00 192.00 120.00 53.00 29.00 19.00 1980 15.00 13.00 14.00 28.00 49.00 74.00 171.00 183.00 95.00 45.00 26.00 18.00 64.36 18.00 29.00 18.00 39.00 50.00 98.00 180.00 206.00 81.00 36.00 23.00 17.00 15.00 14.00 15.00 22.00 77.00 125.00 382.00 491.00 248.00 119.00 52.00 35.00 1981 14.00 14.00 14.00 36.00 88.00 121.00 215.00 467.00 167.00 75.00 44.00 30.00 121.09 15.00 14.00 19.00 40.00 112.00 262.00 238.00 515.00 103.00 60.00 39.00 27.00 23.00 21.00 27.00 54.00 91.00 151.00 284.00 452.00 318.00 88.00 43.00 24.00 1982 20.00 22.00 32.00 58.00 86.00 243.00 347.00 475.00 241.00 87.00 37.00 22.00 135.93 29.00 18.00 70.00 67.00 92.00 213.00 425.00 452.00 136.00 53.00 29.00 21.00 18.00 17.00 17.00 33.00 92.00 172.00 281.00 384.00 423.00 174.00 65.00 38.00 1983 17.00 16.00 22.00 40.00 148.00 122.00 225.00 387.00 388.00 114.00 56.00 33.00 137.13 18.00 15.00 30.00 64.00 135.00 213.00 335.00 408.00 243.00 85.00 46.00 30.00 27.00 21.00 30.00 39.00 92.00 303.00 368.00 308.00 373.00 58.00 37.00 29.00 1984 25.00 22.00 32.00 47.00 119.00 273.00 261.00 308.00 211.00 55.00 33.00 27.00 129.22 26.00 24.00 44.00 50.00 162.00 245.00 413.00 341.00 109.00 59.00 30.00 24.00

5-205 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Average 26.00 22.00 27.00 28.00 47.00 78.00 273.00 335.00 352.00 157.00 97.00 44.00 1985 22.00 22.00 24.00 34.00 53.00 127.00 347.00 482.00 252.00 262.00 70.00 38.00 133.54 22.00 24.00 28.00 41.00 92.00 144.00 366.00 416.00 199.00 128.00 52.00 39.00 35.00 26.00 27.00 34.00 82.00 114.00 307.00 468.00 220.00 126.00 75.00 49.00 1986 31.00 27.00 28.00 54.00 115.00 244.00 542.00 398.00 175.00 107.00 66.00 47.00 141.32 29.00 27.00 32.00 67.00 97.00 315.00 512.00 260.00 141.00 84.00 56.00 41.00 36.00 32.00 34.00 52.00 83.00 158.00 181.00 286.00 288.00 127.00 70.00 45.00 1987 35.00 35.00 36.00 50.00 66.00 157.00 189.00 307.00 228.00 99.00 65.00 32.00 114.18 34.00 35.00 44.00 74.00 101.00 154.00 279.00 318.00 184.00 88.00 53.00 30.00 33.00 30.00 36.00 56.00 109.00 159.00 295.00 363.00 227.00 179.00 77.00 39.00 1988 32.00 30.00 47.00 85.00 129.00 150.00 324.00 367.00 215.00 141.00 68.00 34.00 137.15 31.00 30.00 49.00 98.00 147.00 211.00 373.00 323.00 241.00 100.00 56.00 33.00 30.61 17.95 24.85 28.00 71.99 117.58 222.93 367.58 316.77 84.00 44.24 30.71 1989 28.14 19.17 27.17 36.01 83.18 128.69 223.60 377.64 240.07 70.66 37.93 27.00 108.41 26.71 23.48 31.12 44.75 87.07 178.20 236.44 316.16 180.13 48.11 32.34 23.68 22.51 16.96 34.64 44.07 108.74 135.68 317.18 392.65 334.79 93.89 44.60 30.71 1990 20.69 18.12 37.88 56.67 125.63 148.50 318.12 403.40 253.72 78.97 38.24 27.00 127.69 19.64 22.19 43.38 70.43 131.52 205.62 336.40 337.73 190.37 53.77 32.60 23.68 26.05 18.23 29.11 39.08 97.24 140.67 256.78 374.86 295.81 74.92 38.41 26.97 1991 23.95 19.47 31.84 50.25 112.35 153.97 257.55 385.12 224.19 63.01 32.93 23.71 115.24 22.73 23.85 36.46 62.45 117.61 213.20 272.35 322.43 168.21 42.90 28.08 20.79 20.65 17.28 18.32 24.10 54.24 105.43 196.71 399.60 339.61 78.27 37.50 24.12 1992 18.98 18.45 20.03 30.98 62.67 115.39 197.30 410.53 257.38 65.84 32.15 21.20 103.78 18.02 20.09 22.94 38.51 65.60 159.78 208.63 343.70 193.11 44.82 27.41 18.59 26.92 21.88 27.50 35.56 72.25 133.89 261.55 359.58 304.09 106.30 51.95 34.18 Average 24.72 23.92 30.28 45.99 84.52 146.82 265.09 369.48 231.92 91.04 44.51 30.00 116.42 24.21 25.39 36.01 57.05 91.49 199.97 290.56 321.11 173.19 63.16 37.73 27.31

27.91 21.75 30.62 38.21 53.49 110.96 192.74 239.33 222.47 63.07 38.96 29.29 90% Dependable 25.66 23.23 33.49 49.13 61.80 121.45 193.31 245.88 168.60 53.05 33.40 25.75 86.75 Year 24.35 28.46 38.35 61.06 64.70 168.17 204.42 205.86 126.51 36.12 28.48 22.58

28.92 21.19 26.10 32.35 53.99 129.19 315.43 353.18 279.89 107.93 53.71 38.03 26.59 22.63 28.55 41.59 62.38 141.40 316.37 362.84 212.12 90.78 46.05 33.43 115.91 50% Dependable Year 25.24 27.72 32.69 51.69 65.30 195.80 334.55 303.78 159.15 61.81 39.26 29.32

5-215 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

CHAPTER-VI

CONCEPTUAL LAYOUT AND PLANNING

6.1 INTRODUCTION

The Sirkari Bhyol Rupsiabagar hydro-electric project as planned envisages construction of a 103 m high concrete gravity dam above the deepest foundation level across the river Goriganga about 1.8 km upstream of confluence of Ralamgad with the river. The water from the diversion dam will be led to an underground power house located about 2 km downstream of dam site on the right bank hills, a 700 m long head race tunnel, pressure shaft, power house and tail race works. The power house planned has an installed capacity of 210 MW (3x70 MW) utilising a rated head of 388.97 m.

Central Electricity Authority in its planning for this project had envisaged the diversion structure, where the river bed level is about 1960 m and the power house TWL at 1720 m. A team of experts after visit to the area and toposheet studies, selected the dam site about 800 m upstream of this location where the river bed level is at about EL 2040 m. The river flows in a narrow gorge of 70 to 80 m width with competent rocks both for the dam and abutment foundations and the site is ideally suited for a gravity dam.

The intake and the HRT are planned on the right flank of the river and the power house on the right flank hill. The normal TWL at the power house is 1720 m and this corresponds to FRL of planned Rupsiabagar-Khasiabara project.

Some changes have been made in the location of dam, power house, TRT etc. and with the layout of the scheme including dam height and the other features as now planned, the potential of the project as finalised has been enhanced to 210 MW as against 145 MW planned by CEA.

6-1 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

The location of the dam and it’s height have been finalised considering optimum power generation, topographical and geotechnical features, already planned projects on the upstream and downstream, economy, submergence and other relevant factors. The site is considered ideally suited for the construction of a concrete gravity dam. Embankment type of dam was not considered in view of non-availability of impervious materials and spillway considerations.

The dam is 232 m long at the top and consists of overflow and non-overflow blocks. The overflow blocks are designed as ogee control structures with a crest level of 2101 m and 19 m high radial gates. The FRL and MWL of the dam are at EL 2120 m and EL 2121m respectively and the top of dam is kept at EL 2123 m after allowing for necessary freeboard. The MDDL is kept at EL 2110 m which will provide the required peaking storage against the gates during the lean months and also meet the requirement of power intake.

The intake, HRT, surge shaft and penstocks are located in competent rocks, and are not likely to pose any construction problems. The underground power house located on the right bank hill is also having good rock conditions for excavation of the cavern.

The salient features of the project are included in the report. The details of the major components of the project alongwith the design considerations are given in subsequent paragraphs.

6.2 DIVERSION STRUCTURE

A 103 m high (above deepest foundation level) concrete gravity dam is proposed near village Lilam on Goriganga river. The dam is proposed at latitude 30 o 11’6” N and longitude 80 o 14’16” E. The concrete dam will have a FRL of 2120 m and MDDL of 2110 m. The MWL of the dam as worked out is

6-2 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

2121 m and the top of the dam is kept at EL 2123 m after taking into account the required freeboard.

The proposed dam will have a submergence area of 1,27,800 sq. m at FRL and all this area will be within the river gorge (refer chart 1). The reservoir storage for peaking purposes in the lean season between MDDL and FRL is 1.17 M. Cum (refer chart 2).

Overflow type of spillway blocks three in number with ogee control structures have been planned to pass the design flood discharge of 3681.71 cumecs. For the spillway, ski jump bucket energy dissipators have been planned as terminal structures with concrete apron protection beyond spillway bucket. The dam will have nine number NOF blocks and two spillway bays of 12 m each in three number overflow blocks. The pier width for the spillways has been kept as 2.5 m. The choice of ski jump energy dissipation works for this dam has been dictated by the tail water conditions. As the river gradient is quite steep, stilling basin energy dissipation works have not been found economical. The spillway bays are provided with 19 m high radial gates.

The foundation rocks both at the river bed and abutments are found to be quite competent and no major geological discontinuities are anticipated. As a foundation treatment measure consolidation grouting throughout the entire base of the dam to a depth of 10 m and one row of curtain grouting to a depth of h/2 where “h” is the height between FRL and deepest foundation level subject to a minimum depth of 10 m have been provided. A grouting cum drainage gallery has been provided at the bottom of the dam, through which the curtain grouting as well as drainage hole works will be done.

All the hydraulic and structural designs for the dam, spillway and other components of the dam have been done as per relevant BIS codes / standards and the State of the art practices. The dam sections will also be

6-3 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

zoned with different grades of concrete in order to economise the cost without sacrificing the stability and safety requirements.

The dam and underground power house will also be provided with measuring devices as per BIS codes to observe and monitor the behaviour of these structures. The layout plan of the dam and other components of the project are shown in drawing no. WAP/PFR/RUPSIABAGAR/1001. The dam plan and elevation are shown in drawing no. WAP/PFR/RUPSIABAGAR/1003 and sectional details of NOF and over flow blocks are shown in drawing no. WAP/PFR/RUPSIABAGAR/1004.

6.3 POWER INTAKE

The intake structure for diverting the design discharge of 75.08 cumec (including silt flushing requirement) is proposed on the right bank of river Goriganga about 100 m upstream of the proposed diversion dam. The intake is proposed at EL. 2102 m keeping in view the requirements of power intakes like sufficient cushion of water above the Intake tunnel, reservoir siltation etc. Suitable desilting arrangement has been provided to remove particles of size 0.2 mm and above by providing a desilting chamber.

The required flows for power generation are proposed to be diverted through 2 no. independent identical intake structures of capacity 37.54 cumec each and 40 m apart with crest at EL.2102 m. Each of the two trashracks will have 5 spans of 4.5 m each separated by 4 no. piers of 1.5 m width each at center to center distance of 6.0 m. The total width of each intake will, therefore, be 30 m. The trashracks will be in panels of size 4.5 m x 0.75 m which can be easily lowered in inclined trashrack grooves. The racks will be made out of steel flats of size 15 mm x 50 mm rounded at inlet ends and shall be fixed vertically on each of these panels at a spacing of 20 mm c/c.

6-4 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

Assuming 50% clogging, the velocity through the trashracks will be restricted to 0.75 m/s.

The flows through each intake will be led to an intake tunnel with a bell mouth entry. The vertical lift gates of size 3.5m x 3.5m will control the flow into the intake tunnels. Stop Logs have also been provided for the intakes. For operation of gates, a gate hoisting structure will be provided at EL. 2123 m. A vent pipe of 200 mm diameter would also be provided just downstream of the intake gates. Alongwith structure for gate hoists, a deck has also been proposed at EL 2111 m to install / clear the trashracks when reservoir level reaches MDDL. The details of intake structure are shown in Drawing No. WAP/PFR/RUPSIABAGAR/1005. The hill slope near each intake will be stabilized with adequate slope protection measures like rock bolts, shotcrete, benching, drainages etc. as necessary.

6.4 INTAKE TUNNELS

Two number intake tunnels have been proposed, one each for the two independent intake structures. Each of these tunnels is designed to carry 37.54 cumec discharge. The tunnels will be D - shaped with a finished diameter of 3.25 m and will meet independent desilting chambers. At the end of each desilting chamber a gate control shaft would be provided which will control flow into tunnels of same size leading to HRT. These tunnels will merge into a single headrace tunnel which will carry the total flow further upto a surge shaft. The length of each intake tunnel will vary to suit the merger point with the headrace tunnel. To excavate these tunnels, rock support system shall be provided to suit the geological conditions of the strata through which these are excavated. The intake tunnels will be provided with 200 mm thick PCC lining.

6-5 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

6.5 DESILTING CHAMBERS

It is proposed to provide desilting chambers to flush out all silt particles of 0.2 mm size and above.

Two Nos. trough type underground desilting chambers operating under pressure flow conditions are proposed. These are fed by independent intake tunnels. Each desilting chamber will be 9 m wide, 14 m deep and 250 m long and will have smooth transitions at inlet and outlet ends to avoid eddy formations.

The desilting chamber troughs will have 2 m x 2 m longitudinal drains at bed level. These drains will be covered with removable slabs having 250 mm to 25 mm dia holes at 4.0 m centre to centre through which the silt particles that settle will pass to the silt collecting drains. At the end of desilting chambers, gates are provided in an underground hoist chamber to flush out silt laden waters in the drains to a common silt flushing tunnel that takes the silt-laden waters back to the river. These silt flushing gates of size 2.0 x 2.0 m can be vertical or radial gates. An opening of about 20 cm height of these gates will induce sufficient silt flushing velocity to flush out the accumulated silt in the drains. The silt flushing discharge passing through each gate opening would be about 7.5 m 3/sec.

6.6 HEAD RACE TUNNEL

A single horseshoe shaped headrace tunnel of 4.5 m finished diameter and about 800 m length has been designed to carry the required flows further upto the surge shaft. This tunnel is designed to carry a discharge of 60.06 m3/s. The tunnel alignment has been so fixed that it has adequate rock cover along its route. The tunnel will be provided with suitable rock support system depending upon the geological strata / formations enroute. Apart from the

6-6 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

rock support system, the headrace tunnel will be provided with a 250 mm thick plain cement concrete lining to reduce the head loss due to friction.

The details of typical rock support system and the concrete lining of headrace tunnel are shown in drawing no. WAP/PFR/RUPSIABAGAR/1006.

6.7 PRESSURE SHAFT

A single pressure shaft of 3.75 m diameter trifurcating to 3 numbers is proposed from the head race tunnel to power house at centerline elevation of 1711.5 m.

Flows to turbines will be controlled by independent butterfly valves placed in the powerhouse cavern.

The pressure shaft shall be provided with 500 mm thick concrete lining. Below elevation 1950 m, steel liners shall also be provided in the pressure shaft upto the power house. The thickness of steel liner shall vary from 12 mm in the beginning to 30 mm near the power house. Drawing No. WAP/PFR/RUPSIABAGAR/1002 shows the L-section along the water conductor system.

6.8 UNDERGROUND POWER HOUSE COMPLEX

An underground power house is proposed for this project, as the river bank at the tailrace outfall is very steep and there is no space where a surface power house can be economically built. The geological strata at this location comprises of central crystalline group (Chiplakot formations) consisting of porphyroblastic biotite -gneiss, schistose quartzite, phyllite and amphibolite with southerly as well as northerly dips due to broad antiforms and synforms. This geological strata is considered suitable for an underground power house. The roof and sides of the power house and the transformer cavities

6-7 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT will be provided with suitable supporting system like shotcrete, rock bolts etc. as necessary.

The underground power house complex comprises of two separate caverns about 38 m apart. The main cavern of 16.5 m width & 88 m long will house generating equipment out of which 46 m length will house 3 units of 70 MW each and the remaining is occupied by a service bay of 22 m length and a control block of 20 m length. The generator floor and service bay will be at EL. 1718.5 m and the control block portion will be at higher elevation with a workshop facility underneath. Besides the turbine & generators etc, this cavern will house 3 no. main inlet valves, one for each unit. The centre line of turbines with be at EL 1711.5 m. An EOT crane of suitable capacity will be provided which will run from the beginning of service bay to the end of machine hall.

The transformer cavern will be 13 m wide and would house transformers and GIS. A cable cum ventilation tunnel will be provided from this cavern to the outdoor switch yard. Both the caverns will be connected by a 5 m diameter D-shaped bus bar tunnels. The draft tubes will merge into a manifold which will have a 4.5 m dia D-shaped tailrace tunnel at one end. The flow from draft tubes will be controlled by bonnet type draft tube gates having hoists installed in the transformer cavern. The TRT will have a reverse slope to meet the river.

The underground caverns will be approached by a common main access tunnel of 7.0 m dia D-shaped starting from the existing road along the right bank of river. This access tunnel will have a maximum gradient of 1 in 15 and will be concrete lined and properly electrified and ventilated.

The details of underground power house complex are shown in drawing no. WAP/PFR/RUPSIABAGAR/1007 and 1008.

6-8 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

6.9 ELECTRO - MECHANICAL WORKS

The proposed 210 MW Sirkari Bhyol Rusiabagar Hydro-Electric Project would have Under ground type powerhouse. The installed capacity would be provided by 3 nos. Vertical Axis Francis turbine driven generating units of 70 MW each. It is proposed to provide Inlet Valve of spherical type for each turbine, which would be accommodated in the powerhouse cavern.

The generation voltage of 11 kV would be stepped up to 220 kV through 3 sets of single phase 28 MVA, 11/ 220/ √3 kV ODWF type unit step up transformers for each unit located in Transformer cavern. The 11 kV isolated phase bus ducts would connect the 11 kV generator terminals with 11 kV bushings of step up transformers. The 220 kV terminal of the transformers would be connected with 220 kV Gas Insulated Switchgear (GIS) located on the floor above the transformers in transformer cavern.

The layout of generating equipments, unit step up transformers, switchyard etc. is indicated in the following drawings.

1. Plan of the Power House at service bay level - WAP/PFR/RUPSIABAGAR/1007 2. Cross-section of the Power House - WAP/PFR/RUPSIABAGAR/1008

The GIS would accommodate 7 bays, 3 for generator incomings, 2 for outgoing 220 kV transmission lines, one for bus coupler and one for step down transformer.The power generated would thus be evacuated through 2 nos. 220 kV transmission lines. The single line diagram is enclosed given in Drawing NO. WAP/PFR/RUPSIABAGAR/1009.

6-9 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

6.10 BRIEF PARTICULARS OF EQUIPMENTS

TURBINE AND GOVERNOR

The upstream levels, tailrace levels and heads available for power generation are indicated below:

i) Upstream Levels • FRL EL 2120.0 M • MDDL EL 2110.0 M

ii) Tailrace Levels • Maximum EL 1720.0 M • Minimum EL 1718.0 M

iii) Heads • Maximum net head 393.30 M • Minimum net head 381.30 M • Rated head 388.97 M

Francis type turbine is considered appropriate choice considering the capacity of the generating units and head available for power generation. The turbine would be suitably rated to provide 70 MW at generator terminals at rated head of 388.97 M. The speed of turbine has been determined as 500 RPM. The centre of turbine runner has been set at EL 1711.5 M, 6.5 m below the minimum TWL which is at EL 1718 M. The governor would be electro- hydraulic digital PID type suitable for fully automatic control. The closing time of wicket gates would be so adjusted so as not to increase the speed rise and pressure rise more than 45% and 30% respectively under full load throw off condition .

6-10 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

6.11 MAIN INLET VALVE

It is proposed to provide an Inlet Valve of the spherical type for each turbine as second line of defence in stopping the water flow to the turbine when due to governor malfunctioning, the generating units may tend to go to runaway speed. During the time when the generating unit is under stand still condition, it would help in minimizing the water leakage through the wicket gates of the turbine. The opening of the valve would be achieved through pressurized oil servomotor and closing through counter weight.

6.12 GENERATOR AND EXCITATION SYSTEM

The generator shaft would be directly coupled with the turbine shaft. The bearing arrangement would be semi-umbrella type with combined thrust and guide bearings below the rotor and one guide bearing above the rotor. The generator would be of the closed air circuit water-cooled type. The main parameters of the generator would be as indicated below:

i) Rated out put - 70 MW ii) Power factor - 0.9 lag iii) Speed - 500 RPM iv) Class of Insulation of stator and rotor winding - Class 'F' v) Generation Voltage - 11 kV

The generators would be provided with static excitation equipment and voltage regulator. Necessary power for excitation would be provided by tapping the generator terminals.

6-11 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

2.13 UNIT STEP-UP TRANSFORMER

Three single phase 28 MVA, 11/ 220/√3 kV transformers, would be provided for each generating unit with one spare transformer of same rating common for all the units. The likely transport limitations have dictated the choice for Single-phase transformers. These transformers would be located in the transformer cavern. The 11 kV bushing of the transformers would be connected with 11 kV terminals of generator through 11 kV bus ducts. The 220 kV bushing would be connected with 220 kV Gas Insulated Switchgear located on the floor above the transformers in transformer cavern.

6.14 EOT CRANE

The heaviest equipment which the powerhouse crane/s are required to handle during erection and subsequently during maintenance is the generator rotor. The weight of the generator rotor has been estimated to be about 157 tonnes. It is proposed to provide one EOT crane of 175/ 35 tonnes capacity.

6.15 AUXILIARY EQUIPMENT AND SYSTEMS FOR THE POWER HOUSE

Following equipments for the auxiliary systems of the power house would be provided:

i) Cooling water system for turbines, generators, unit step up transformers etc. ii) Drainage System iii) Dewatering system iv) High pressure compressed air equipment for governor and MIV etc. v) Low pressure compressed air equipment for station services vi) 415 V LTAC supply system comprising station service transformers, unit auxiliary transformer, station service board, unit auxiliary boards etc.

6-12 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

vii) D.C. supply system comprising 400 V DC battery, chargers, DC distribution boards etc. viii) Ventilation system for the power house ix) Air conditioning system for control room, conference room etc. x) Illumination system xi) Earthing system xii) Oil handling system xiii) Power and control cables xiv) Fire protection system

6.16 220 kV SWITCHYARD

It is proposed to provide 220 kV, Gas Insulated Switchgear located on the floor above the transformers in the Transformer cavern having 7 bays. 3 bays for generator incoming, 2 bays for 220 kV transmission lines, 1 bay for step down transformer and 1 bay for bus coupler. The double bus bars arrangement has been proposed which would provide flexibility and reliability in the operation of the plant.

6.17 OBSERVATIONS OF CEA & CWC

The Draft Report of this project was submitted to CEA for perusal during October 03. The observations received from the various directorates of CWC and CEA on the civil and electrical aspects of the projects have been considered and taken care in this report. The detailing has been kept to the possible extent as the report pertains to the preliminary feasibility stage studies.

6-13 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

CHAPTER-VII

POWER POTENTIAL STUDIES

7.1 GENERAL

The power potential studies have been carried out for Sirkari Bhyol Rupsiabagar Hydel Scheme The projected power supply position for 11 th Plan indicate that there would be shortage of peak power in Uttranchal State as well as in Northern region. The execution of this project would help in reducing the gap between supply and demand of power.

This is a Run of the river type development having diurnal storage for peaking purpose and would utilize a rated head of 388.97 M of water. The power house would be of Under Ground type.

7.2 FIXATION OF FRL/MDDL

The FRL of the pondage has been fixed at EL 2120.0 M so as to get adequate storage capacity for peaking operation of the plant during lean period. The MDDL at EL 2110.0 M has been fixed keeping the requirement of minimum cushion of water above the head race tunnel (HRT) to rule out the air entrainment into the HRT. The storage at FRL is computed as 3.74 million cubic metres whereas the storage at MDDL is estimated as 2.57 million cubic metres, thus making available live storage of 1.17 million cubic metres. The levels v/s capacity characteristics of the pondage are indicated in Annex 7.1.

7.3 FIXATION OF TAIL RACE WATER LEVEL (TWL)

The minimum tail water level which corresponds to discharge of one generating unit at 10% load has been determined as EL 1718.0 M. The

7-1 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

maximum TWL at EL 1720.0 M corresponds to all the units running at full load.

These levels however would need to be verified when it would be possible to prepare tail rating curve.

7.4 WATER AVAILABILITY

The available data of water flows on 10 daily basis has been analysed in Chapter No. 5 on "hydrology". Water flows series for 30 years (1962-63 to 1991-92) has been utilised for power potential studies and is indicated in Annex-7.2.

7.5 TYPE OF TURBINE

The rated head of 388.97 M available for power generation and unit capacity lead to the choice of Francis turbine to be used in the station. The following efficiencies applicable for Francis turbine driven generating unit have been considered for power potential studies

- Efficiency of turbine - 93.5% - Efficiency of generator - 98% - Combined efficiency of - 91.63% turbine and generator

7.6 90% AND 50% DEPENDABLE YEARS

For determining 90% and 50% dependable years, Annual energy generation for all the 30 years (1962-63 to 1991-92) has been computed with unlimited installed capacity. The yearwise power potential and energy generation is indicated in Annex-7.3 & 7.4 respectively. Annual energy generation is tabulated in descending order and indicated in Annex-7.5. The 90% and 50% dependable years have been determined on the

7-2 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

following basis, where N is the no. of years for which inflow series is available.

90% year - (N+1) x 0.9 - 31x0.9 - 28 th year 50% year - (N+1) x 0.5 - 31x0.5 - 16 th year

Based on above, 1965-66 and 1970-71 work out to be 90% and 50% dependable years respectively.

7.7 INSTALLED CAPACITY

7.7.1 The power potential in a 90% dependable year with different installed capacities (140 MW to 240 MW) is indicated in Annex-7.6 . The simulation studies have been carried out with FRL at EL 2120.0 M, MDDL at EL 2110.0 M, losses in the water conductor system as 8.7 m and average TWL at EL 1719 M.

7.7.2 The study indicates that the firm power is 39.63 MW continuous in 90% dependable year. Considering four hours peaking the installed capacity required would be about 237.78 MW.

7.7.3 For optimization of Installed Capacity, Annual energy generation (KWh), Incremental Energy generation d(KWh), and ratio of Incremental energy to Incremental Installed Capacity d(KWh)/d(KW) have been computed for 90% dependable year for installed capacity upto 250 MW varying in steps of 10 MW. The results are indicated in Annex-7.7. It would be seen there from that d(KWh)/d(KW) has steep drop for increase in installed capacity from 210 MW to 220 MW thus justify installed capacity of 210 MW.

7.7.4 Keeping in view the system requirements and analysis of Incremental energy and Incremental installed capacity, the installed capacity of 210.0 MW is considered optimum. With the installation of 210 MW, the load factor

7-3 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

of operation during lean flow period would be 18.87% corresponding to 4.52 hours of peaking.

7.7.5 Regarding the number of generating units to be installed, the following options are possible :

1 x 210 MW 2 x 105 MW 3 x 70 MW

Installation of one unit of 210 MW would be preferable from economic considerations. However, the width of underground powerhouse required would be critical in Himalayas. Installation of two units would provide increased reliability of power supply from the station and also provide more flexibility for part load operation. Installation of three units would have all the advantages which are applicable to installation of two units, however, it would result in increased capital cost but decrease in the weight of rotor & transformers to be transported at site. Considering the above, it is decided to have installation of the three units of 70 MW each. The turbine would be suitably rated to provide 70 MW at generator terminals at rated head of 388.97 M. The speed of the turbine has been determined as 500 RPM.

7.8 RESULTS OF STUDIES

Annual energy generation in 90% dependable year and in 50% dependable year have been computed for installed capacity of 210.0 MW (3 x 70 MW) and are indicated in Annexures 7.6 and 7.8 respectively. The results are also briefly indicated below.

7-4 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

Particulars 90% dependable 50% dependable year year Annual Energy 967.97 1140.37 Generation (Gwh) MW continuous 39.63 56.86 Average annual load 52.62% 61.99% factor Load factor in lean flow 18.87% 27.07% months

The design energy computations have been carried out and indicated in Annexure 7.9. The design energy of 937.23 GWh would be considered for financial evaluation.

The annual energy generation restricted to installed capacity of 210 MW for 30 years i.e. 1962-63 to 1991-92 is summarized in Annex-7.10.

The annual run-of in 90% and 50% dependable years have been determined as 1417.91 MCUM and 2031.50 MCUM respectively.

The live storage of 1136.33 MWh (1.17 Million cubic meters) is available whereas the storage required for peaking operation works out to only 951.12 MWh. Thus sufficient storage is available for peaking operation of the station.

7.9 CONCLUSIONS

The power potential studies carried out indicates that installed capacity of 210 MW comprising 3 generating units of 70 MW each would be required for this HEP to derive optimum power benefits. The project would afford annual energy generation of 967.97 GWh in a 90% dependable year.

7-5 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

7.10 RECOMMENDATIONS FOR FURTHER STUDIES

7.10.1 At DPR stage, based on the data available of topographic survey, tail race rating curve should be evolved so that in energy computations the head utilized for power generation is corrected with the change in tail race level corresponding to discharge. In the present study, tailrace level was considered constant.

7.10.2 The storage at FRL 2120 M and at MDDL 2110 M should be computed with more accuracy based on the data of topographic survey.

7.10.3 As the live storage capacity at the pondage is more than the requirement for peaking, studies should be carried out to optimize the FRL so as to reduce the cost of civil engineering works.

7-6 ANNEXURE 7.1

SIRKARI BHYOL RUPSIABAGAR HYDEL PROJECT

AREA CAPACITY CURVE

ELEVATION CAPACITY IN (M) (MCUM) MDDL 2110 2.57 2111 2.69 2112 2.81 2113 2.92 2114 3.04 2115 3.16 2115.5 3.21 2116 3.27 2116.5 3.33 2117 3.39 2117.5 3.45 2118 3.51 2118.5 3.56 2119 3.62 2119.5 3.68 FRL 2120 3.74 ANNEXURE-7.2

SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME INFLOWS FOR 30 YRS SERIES Cumecs 1962-63 1963-64 1964-65 1965-66 1966-67 1967-68 1968-69 1969-70 1970-71 1971-72 1972-73 1973-74 1974-75 1975-76 1976-77 1977-78 1978-79 1979-80 1980-81 1981-82 1982-83 1983-84 1984-85 1985-86 1986-87 1987-88 1988-89 1989-1990 1990-1991 1991-92 Jun 80.07 74.18 56.75 60.43 59.48 51.68 75.88 67.93 70.36 113.53 58.89 93.16 54.03 121.62 61.68 51.74 84.96 26.14 39.76 68.08 82.23 93.67 165.01 42.48 62.08 86.05 86.59 64.03 73.89 76.61 87.63 81.19 62.12 66.14 65.1 56.56 83.04 74.35 77.01 124.26 64.45 101.96 59.14 133.11 67.51 37.58 82.23 34.85 40.3 65.9 132.34 66.44 148.68 69.16 132.88 85.5 81.69 70.09 80.87 83.85 121.35 112.43 86.01 91.59 90.14 78.32 114.99 102.96 106.63 172.06 89.25 141.19 81.89 184.32 93.48 90.95 140.51 55.55 53.37 142.69 116 116 133.43 78.42 171.55 83.87 114.91 97.05 111.98 116.11 Jul 137.51 161.22 157.33 104.96 118.99 129.11 158.71 130.58 171.78 181.74 132.4 165.81 114.74 164.86 110.24 116.54 163.92 64.81 98.03 208.04 154.67 153.03 200.41 148.68 167.19 98.57 160.66 121.41 172.74 139.85 137.92 161.7 157.8 105.28 119.34 129.5 159.19 130.97 172.3 182.28 132.8 166.31 115.09 165.35 110.57 134.52 156.3 68.08 93.13 117.09 188.98 122.54 142.14 188.98 295.17 102.93 176.45 121.77 173.25 140.26 145.84 170.99 166.86 111.33 126.2 136.94 168.33 138.5 182.19 192.75 140.43 175.86 121.7 174.85 116.93 111.64 162.84 87.68 98.03 129.62 231.46 182.44 224.92 199.32 278.84 151.94 203.14 128.77 183.2 148.32 Aug 254.99 250.74 186.62 130.34 203.97 209.78 201.01 194.09 192.34 231.18 148.52 184.96 184.87 202.58 163.46 166.1 257.05 86.59 104.56 267.4 246.16 209.13 167.74 182.44 254.87 155.76 197.69 200.18 213.84 204.15 261.96 257.6 191.73 133.91 209.55 215.52 206.51 199.41 197.6 237.51 152.58 190.02 189.93 208.13 167.94 186.25 244.53 90.95 99.66 254.33 258.69 210.76 167.74 262.5 216.75 167.19 199.87 205.66 219.69 209.74 219.32 215.67 160.52 112.11 175.44 180.44 172.9 166.94 165.44 198.85 127.74 159.09 159.01 174.25 140.6 153.58 185.16 71.34 112.19 280.47 246.16 222.2 185.71 226.55 141.6 173.18 175.91 172.18 183.93 175.59 Sep 233.79 206.86 207.32 121.16 135.88 166.35 143.18 216.9 152.43 211.88 179.36 196.7 143.53 219.3 165.32 124.71 152.49 56.64 65.35 135.06 173.18 230.37 203.14 191.7 119.81 156.85 123.62 172.51 182.33 161.1 177.18 156.77 157.12 91.82 102.98 126.07 108.51 164.38 115.52 160.58 135.93 149.08 108.77 166.2 125.29 112.19 116.54 35.4 51.74 90.95 131.25 211.31 114.91 137.24 95.31 124.17 117.09 130.74 138.18 122.09 132.94 117.63 117.89 68.9 77.27 94.59 81.42 123.34 86.68 120.48 101.99 111.85 81.61 124.7 94.01 94.76 86.59 26.14 44.11 56.09 74.07 132.34 59.36 108.38 76.79 100.21 131.25 98.1 103.68 91.61 Oct 68.59 51.88 57.27 34.35 35.42 45.64 49.95 63.74 58.78 65.57 47.9 130.46 51.67 70.74 43.27 64.26 59.91 26.14 28.86 64.81 47.92 94.76 31.59 85.5 68.62 69.16 97.48 45.75 51.13 40.8 57.69 43.64 48.17 28.89 29.79 38.39 42.01 53.61 49.44 55.15 40.29 109.74 43.46 59.5 36.4 47.92 43.57 21.24 24.51 40.85 47.38 62.08 29.95 142.69 58.27 53.92 76.79 38.48 43.01 34.32 39.28 29.71 32.8 19.67 20.29 26.14 28.6 36.5 33.66 37.55 27.43 74.71 29.59 40.51 24.78 39.21 28.86 16.34 19.61 32.68 28.86 46.29 32.13 69.71 45.75 47.92 54.46 26.2 29.28 23.36 Nov 30.54 27.86 27.56 21.22 20.72 24.39 25.78 29.95 29.25 35.71 27.66 39.48 26.87 32.63 24.49 29.95 20.69 15.79 15.79 28.32 23.42 35.4 20.15 52.83 40.85 38.12 41.93 24.09 24.29 20.92 26.19 23.89 23.63 18.19 17.76 20.91 22.1 25.67 25.08 30.61 23.72 33.85 23.04 27.97 21 27.77 17.97 11.98 14.16 23.96 20.15 30.5 17.97 38.12 35.94 35.4 37.03 20.66 20.83 17.93 22.32 20.37 20.15 15.51 15.15 17.83 18.84 21.89 21.38 26.1 20.22 28.86 19.64 23.85 17.9 25.05 16.34 10.89 12.53 21.24 15.79 25.05 16.34 28.32 30.5 28.86 30.5 17.61 17.75 15.29 Dec 20.52 19.84 20.03 15.95 15.46 18.28 18.28 20.22 20.71 24.21 19.35 24.31 19.54 22.85 17.8 20.15 13.07 9.8 10.35 19.06 13.07 20.69 15.79 23.96 26.69 24.51 21.24 16.73 16.73 14.69 18.03 17.44 17.61 14.02 13.59 16.07 16.07 17.78 18.21 21.28 17.01 21.37 17.18 20.09 15.64 17.97 11.44 8.71 9.8 16.34 11.98 17.97 14.7 20.69 25.6 17.43 18.52 14.7 14.7 12.91 15.82 15.29 15.44 12.3 11.92 14.09 14.09 15.59 15.97 18.67 14.92 18.74 15.07 17.62 13.72 22.33 10.35 9.26 9.26 14.7 11.44 16.34 13.07 21.24 22.33 16.34 17.97 12.9 12.9 11.32 Jan 14.83 14.74 15.2 11.8 11.71 15.38 15.2 15.75 15.94 18.05 16.21 18.33 16.3 16.86 11.44 18.52 8.71 8.71 8.17 12.53 9.8 14.7 14.16 19.06 19.61 17.97 16.67 12.26 14.19 11.25 13.63 13.55 13.97 10.85 10.76 14.14 13.97 14.48 14.65 16.59 14.9 16.85 14.99 15.49 11.98 14.7 8.17 8.17 7.62 10.89 9.26 13.62 11.98 16.88 19.06 17.43 15.32 11.27 13.04 10.34 12.94 12.86 13.26 10.3 10.21 13.42 13.26 13.74 13.91 15.75 14.15 15.99 14.23 14.71 12.53 13.62 7.62 9.8 8.17 15.79 9.8 14.16 11.98 15.79 18.52 16.88 14.55 10.7 12.38 9.81 Feb 10.39 10.23 11.85 9.89 8.39 11.62 11.08 11.54 12.15 15.29 12.38 13.15 13.08 12.92 11.98 24.51 7.62 7.08 7.62 11.44 9.26 11.44 11.98 14.16 17.43 16.34 9.77 9.24 9.93 9.41 11.09 10.93 12.65 10.56 8.96 12.41 11.83 12.32 12.98 16.33 13.23 14.05 13.96 13.8 11.98 41.39 7.62 7.08 7.62 11.98 8.71 11.98 11.98 14.7 19.06 16.34 10.44 9.87 10.6 10.05 13.59 11.9 15.5 12.93 10.98 13.51 14.49 15.1 15.9 17.78 16.2 17.2 17.1 15.03 11.44 14.7 7.62 15.79 7.62 9.8 8.17 13.07 13.07 14.7 19.06 16.34 12.79 12.08 12.99 10.94 Mar 16.95 11.48 16.68 10.66 9.02 17.22 14.62 14.21 18.18 19.96 21.05 15.99 18.45 15.86 10.89 16.34 8.71 8.17 8.17 14.7 9.26 16.34 14.7 14.7 18.52 19.61 13.53 18.86 15.86 9.98 18.54 12.56 18.24 11.66 9.86 18.83 15.99 15.55 19.88 21.83 23.02 17.49 20.18 17.34 13.07 20.15 9.8 7.62 7.62 17.43 11.98 17.43 13.07 15.25 19.61 25.6 14.8 20.63 17.34 10.91 21.23 14.38 20.88 13.35 11.3 21.57 18.32 17.8 22.77 24.99 26.36 20.03 23.11 19.86 15.25 17.97 11.98 9.8 10.35 38.12 16.34 23.96 15.25 17.43 23.96 26.69 16.95 23.62 19.86 12.5 Apr 19.15 15.96 20.81 10.99 10.64 16.67 16.79 17.62 23.65 18.56 27.55 19.27 25.89 18.56 17.43 20.15 16.88 11.98 11.98 29.41 17.97 21.24 15.25 18.52 28.32 30.5 15.25 24 21.28 13.12 24.63 20.52 26.76 14.14 13.68 21.43 21.59 22.65 30.41 23.87 35.42 24.78 33.29 23.87 15.79 37.03 24.51 15.25 19.61 31.59 21.78 25.6 18.52 29.41 27.23 46.29 19.61 30.86 27.36 16.87 30.61 25.51 33.25 17.57 17 26.64 26.83 28.15 37.79 29.66 44.02 30.8 41.38 29.66 18.52 39.76 34.31 21.24 21.78 36.49 34.85 27.23 22.33 36.49 40.3 53.37 24.37 38.36 34.01 20.97 May 38.53 23.14 29.13 26.68 18.38 34.44 42.34 29.4 31.58 44.11 52.82 27.09 48.33 38.8 23.42 60.45 38.12 26.14 41.93 49.56 50.1 50.1 25.6 44.66 45.2 59.36 39.21 59.22 52.96 29.54 44.51 26.74 33.66 30.83 21.23 39.79 48.92 33.97 36.49 50.96 61.03 31.3 55.84 44.83 28.86 78.97 39.76 26.69 47.92 46.84 80.6 64.81 28.86 62.63 35.94 70.25 45.3 68.42 61.18 34.13 46.6 27.99 35.23 32.27 22.23 41.66 51.21 35.56 38.2 53.35 63.88 32.76 58.45 46.92 41.39 78.42 33.77 27.23 61 50.1 73.52 88.23 50.1 52.83 55 80.06 47.42 71.62 64.05 35.73

Total 2310.41 2174.59 2012.43 1417.91 1636.72 1864.00 1978.22 2015.35 2031.50 2489.57 1886.38 2314.54 1826.19 2373.33 1660.81 1911.68 2041.68 921.57 1168.66 2176.02 2321.33 2394.38 2103.33 2387.64 2444.25 2056.82 2187.00 1955.06 2162.76 1854.96 (Mcum) ANNEXURE-7.3 SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME UNRESTRICTEDE POWER POTENTIAL FOR 30 YRS SERIES

FRL 2120 m GROSS HEAD 397.67 m GEN. EFF. 98 % MDDL 2110 m WC LOSSES 8.70 m TUR. EFF. 93.5 % Av. TWL 1719 m RATED HEAD 388.97 m COM. EFF. 91.63 %

1962-63 1963-64 1964-65 1965-66 1966-67 1967-68 1968-69 1969-70 1970-71 1971-72 1972-73 1973-74 1974-75 1975-76 1976-77 1977-78 1978-79 1979-80 1980-81 1981-82 1982-83 1983-84 1984-85 1985-86 1986-87 1987-88 1988-89 1989-1990 1990-1991 1991-92 Jun 279.96 259.36 198.42 211.29 207.96 180.69 265.31 237.51 246.01 396.94 205.90 325.72 188.91 425.23 215.66 180.90 297.05 91.40 139.02 238.03 287.51 327.51 576.94 148.53 217.06 300.86 302.75 223.87 258.35 267.86 306.39 283.87 217.20 231.25 227.61 197.76 290.34 259.96 269.26 434.46 225.34 356.49 206.78 465.40 236.04 131.39 287.51 121.85 140.90 230.41 462.71 232.30 519.84 241.81 464.60 298.94 285.62 245.06 282.75 293.17 424.29 393.10 300.72 320.23 315.16 273.84 402.05 359.99 372.82 601.59 312.05 493.65 286.32 644.45 326.84 318.00 491.28 194.22 186.60 498.90 405.58 405.58 466.52 274.19 599.80 293.24 401.77 339.32 391.53 405.97 Jul 480.79 563.69 550.09 366.98 416.03 451.42 554.91 456.56 600.61 635.43 462.92 579.74 401.18 576.41 385.44 407.47 573.13 226.60 342.75 727.39 540.79 535.05 700.71 519.84 584.56 344.64 561.73 424.50 603.97 488.97 482.22 565.37 551.73 368.10 417.26 452.78 556.59 457.92 602.43 637.32 464.32 581.48 402.40 578.13 386.60 470.33 546.48 238.03 325.62 409.39 660.75 428.45 496.98 660.75 1032.03 359.88 616.94 425.75 605.75 490.40 509.91 597.85 583.41 389.25 441.24 478.79 588.55 484.25 637.01 673.93 491.00 614.87 425.51 611.34 408.83 390.34 569.35 306.56 342.75 453.20 809.27 637.88 786.41 696.90 974.93 531.24 710.26 450.23 640.54 518.58 Aug 891.54 876.68 652.50 455.72 713.16 733.47 702.81 678.61 672.49 808.29 519.28 646.69 646.38 708.30 571.52 580.75 898.75 302.75 365.58 934.93 860.67 731.20 586.48 637.88 891.12 544.60 691.20 699.91 747.67 713.79 915.91 900.67 670.36 468.20 732.67 753.54 722.04 697.21 690.89 830.43 533.48 664.38 664.07 727.70 587.18 651.20 854.97 318.00 348.45 889.24 904.48 736.90 586.48 917.80 757.84 584.56 698.82 719.07 768.12 733.33 766.83 754.07 561.24 391.98 613.41 630.89 604.52 583.69 578.44 695.26 446.63 556.24 555.96 609.24 491.59 536.97 647.39 249.43 392.26 980.63 860.67 776.90 649.31 792.11 495.09 605.50 615.05 602.01 643.09 613.93 Sep 817.42 723.26 724.87 423.62 475.09 581.62 500.61 758.37 532.95 740.81 627.11 687.74 501.84 766.76 578.02 436.03 533.16 198.04 228.49 472.22 605.50 805.46 710.26 670.26 418.90 548.41 432.22 603.16 637.50 563.27 619.49 548.13 549.35 321.04 360.06 440.79 379.39 574.74 403.90 561.45 475.26 521.24 380.30 581.10 438.06 392.26 407.47 123.77 180.90 318.00 458.90 738.82 401.77 479.84 333.24 434.15 409.39 457.12 483.13 426.87 464.81 411.28 412.19 240.90 270.17 330.72 284.68 431.24 303.07 421.24 356.60 391.07 285.34 436.00 328.70 331.32 302.75 91.40 154.23 196.11 258.98 462.71 207.55 378.94 268.49 350.37 458.90 343.00 362.51 320.30 Oct 239.82 181.39 200.24 120.10 123.84 159.57 174.64 222.86 205.52 229.26 167.48 456.14 180.66 247.33 151.29 224.68 209.47 91.40 100.91 226.60 167.55 331.32 110.45 298.94 239.92 241.81 340.83 159.96 178.77 142.65 201.71 152.58 168.42 101.01 104.16 134.23 146.88 187.44 172.86 192.83 140.87 383.69 151.95 208.03 127.27 167.55 152.34 74.26 85.70 142.83 165.66 217.06 104.72 498.90 203.73 188.53 268.49 134.54 150.38 120.00 137.34 103.88 114.68 68.77 70.94 91.40 100.00 127.62 117.69 131.29 95.91 261.21 103.46 141.64 86.64 137.09 100.91 57.13 68.56 114.26 100.91 161.85 112.34 243.73 159.96 167.55 190.41 91.61 102.37 81.68 Nov 106.78 97.41 96.36 74.19 72.45 85.28 90.14 104.72 102.27 124.86 96.71 138.04 93.95 114.09 85.63 104.72 72.34 55.21 55.21 99.02 81.89 123.77 70.45 184.71 142.83 133.28 146.60 84.23 84.93 73.14 91.57 83.53 82.62 63.60 62.10 73.11 77.27 89.75 87.69 107.02 82.93 118.35 80.56 97.79 73.42 97.09 62.83 41.89 49.51 83.77 70.45 106.64 62.83 133.28 125.66 123.77 129.47 72.24 72.83 62.69 78.04 71.22 70.45 54.23 52.97 62.34 65.87 76.54 74.75 91.26 70.70 100.91 68.67 83.39 62.59 87.58 57.13 38.08 43.81 74.26 55.21 87.58 57.13 99.02 106.64 100.91 106.64 61.57 62.06 53.46 Dec 71.75 69.37 70.03 55.77 54.05 63.91 63.91 70.70 72.41 84.65 67.66 85.00 68.32 79.89 62.24 70.45 45.70 34.26 36.19 66.64 45.70 72.34 55.21 83.77 93.32 85.70 74.26 58.49 58.49 51.36 63.04 60.98 61.57 49.02 47.52 56.19 56.19 62.17 63.67 74.40 59.47 74.72 60.07 70.24 54.68 62.83 40.00 30.45 34.26 57.13 41.89 62.83 51.40 72.34 89.51 60.94 64.75 51.40 51.40 45.14 55.31 53.46 53.98 43.01 41.68 49.26 49.26 54.51 55.84 65.28 52.17 65.52 52.69 61.61 47.97 78.07 36.19 32.38 32.38 51.40 40.00 57.13 45.70 74.26 78.07 57.13 62.83 45.10 45.10 39.58 Jan 51.85 51.54 53.15 41.26 40.94 53.77 53.15 55.07 55.73 63.11 56.68 64.09 56.99 58.95 40.00 64.75 30.45 30.45 28.57 43.81 34.26 51.40 49.51 66.64 68.56 62.83 58.28 42.87 49.61 39.33 47.66 47.38 48.84 37.94 37.62 49.44 48.84 50.63 51.22 58.01 52.10 58.91 52.41 54.16 41.89 51.40 28.57 28.57 26.64 38.08 32.38 47.62 41.89 59.02 66.64 60.94 53.56 39.40 45.59 36.15 45.24 44.96 46.36 36.01 35.70 46.92 46.36 48.04 48.63 55.07 49.47 55.91 49.75 51.43 43.81 47.62 26.64 34.26 28.57 55.21 34.26 49.51 41.89 55.21 64.75 59.02 50.87 37.41 43.29 34.30 Feb 36.33 35.77 41.43 34.58 29.33 40.63 38.74 40.35 42.48 53.46 43.29 45.98 45.73 45.17 41.89 85.70 26.64 24.75 26.64 40.00 32.38 40.00 41.89 49.51 60.94 57.13 34.16 32.31 34.72 32.90 38.77 38.22 44.23 36.92 31.33 43.39 41.36 43.08 45.38 57.10 46.26 49.12 48.81 48.25 41.89 144.72 26.64 24.75 26.64 41.89 30.45 41.89 41.89 51.40 66.64 57.13 36.50 34.51 37.06 35.14 47.52 41.61 54.19 45.21 38.39 47.24 50.66 52.80 55.59 62.17 56.64 60.14 59.79 52.55 40.00 51.40 26.64 55.21 26.64 34.26 28.57 45.70 45.70 51.40 66.64 57.13 44.72 42.24 45.42 38.25 Mar 59.26 40.14 58.32 37.27 31.54 60.21 51.12 49.68 63.56 69.79 73.60 55.91 64.51 55.45 38.08 57.13 30.45 28.57 28.57 51.40 32.38 57.13 51.40 51.40 64.75 68.56 47.31 65.94 55.45 34.89 64.82 43.91 63.77 40.77 34.47 65.84 55.91 54.37 69.51 76.33 80.49 61.15 70.56 60.63 45.70 70.45 34.26 26.64 26.64 60.94 41.89 60.94 45.70 53.32 68.56 89.51 51.75 72.13 60.63 38.15 74.23 50.28 73.00 46.68 39.51 75.42 64.05 62.24 79.61 87.37 92.16 70.03 80.80 69.44 53.32 62.83 41.89 34.26 36.19 133.28 57.13 83.77 53.32 60.94 83.77 93.32 59.26 82.58 69.44 43.70 Apr 66.96 55.80 72.76 38.43 37.20 58.28 58.70 61.61 82.69 64.89 96.33 67.38 90.52 64.89 60.94 70.45 59.02 41.89 41.89 102.83 62.83 74.26 53.32 64.75 99.02 106.64 53.32 83.91 74.40 45.87 86.12 71.75 93.56 49.44 47.83 74.93 75.49 79.19 106.33 83.46 123.84 86.64 116.39 83.46 55.21 129.47 85.70 53.32 68.56 110.45 76.15 89.51 64.75 102.83 95.21 161.85 68.56 107.90 95.66 58.98 107.02 89.19 116.25 61.43 59.44 93.14 93.81 98.42 132.13 103.70 153.91 107.69 144.68 103.70 64.75 139.02 119.96 74.26 76.15 127.58 121.85 95.21 78.07 127.58 140.90 186.60 85.21 134.12 118.91 73.32 May 134.72 80.91 101.85 93.28 64.26 120.42 148.04 102.79 110.42 154.23 184.68 94.72 168.98 135.66 81.89 211.36 133.28 91.40 146.60 173.28 175.17 175.17 89.51 156.15 158.04 207.55 137.09 207.06 185.17 103.28 155.62 93.49 117.69 107.79 74.23 139.12 171.04 118.77 127.58 178.18 213.38 109.44 195.24 156.74 100.91 276.11 139.02 93.32 167.55 163.77 281.81 226.60 100.91 218.98 125.66 245.62 158.39 239.22 213.91 119.33 162.93 97.86 123.18 112.83 77.72 145.66 179.05 124.33 133.56 186.53 223.35 114.54 204.36 164.05 144.72 274.19 118.07 95.21 213.28 175.17 257.05 308.49 175.17 184.71 192.30 279.92 165.80 250.41 223.94 124.93 ANNEXURE-7.4

SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME UNRESTRICTEDE ENERGY FOR 30 YRS SERIES

1962-63 1963-64 1964-65 1965-66 1966-67 1967-68 1968-69 1969-70 1970-71 1971-72 1972-73 1973-74 1974-75 1975-76 1976-77 1977-78 1978-79 1979-80 1980-81 1981-82 1982-83 1983-84 1984-85 1985-86 1986-87 1987-88 1988-89 1989-1990 1990-1991 1991-92 Jun 67.19 62.25 47.62 50.71 49.91 43.37 63.67 57.00 59.04 95.27 49.42 78.17 45.34 102.06 51.76 43.42 71.29 21.93 33.36 57.13 69.00 78.60 138.47 35.65 52.09 72.21 72.66 53.73 62.00 64.29 73.53 68.13 52.13 55.50 54.63 47.46 69.68 62.39 64.62 104.27 54.08 85.56 49.63 111.70 56.65 31.53 69.00 29.24 33.82 55.30 111.05 55.75 124.76 58.03 111.50 71.75 68.55 58.81 67.86 70.36 101.83 94.34 72.17 76.86 75.64 65.72 96.49 86.40 89.48 144.38 74.89 118.48 68.72 154.67 78.44 76.32 117.91 46.61 44.78 119.74 97.34 97.34 111.97 65.80 143.95 70.38 96.42 81.44 93.97 97.43 Jul 115.39 135.28 132.02 88.08 99.85 108.34 133.18 109.57 144.15 152.50 111.10 139.14 96.28 138.34 92.51 97.79 137.55 54.38 82.26 174.57 129.79 128.41 168.17 124.76 140.29 82.71 134.81 101.88 144.95 117.35 115.73 135.69 132.42 88.34 100.14 108.67 133.58 109.90 144.58 152.96 111.44 139.56 96.58 138.75 92.78 112.88 131.16 57.13 78.15 98.25 158.58 102.83 119.27 158.58 247.69 86.37 148.06 102.18 145.38 117.70 134.62 157.83 154.02 102.76 116.49 126.40 155.38 127.84 168.17 177.92 129.62 162.33 112.33 161.39 107.93 103.05 150.31 80.93 90.49 119.65 213.65 168.40 207.61 183.98 257.38 140.25 187.51 118.86 169.10 136.91 Aug 213.97 210.40 156.60 109.37 171.16 176.03 168.67 162.87 161.40 193.99 124.63 155.21 155.13 169.99 137.16 139.38 215.70 72.66 87.74 224.38 206.56 175.49 140.76 153.09 213.87 130.70 165.89 167.98 179.44 171.31 219.82 216.16 160.89 112.37 175.84 180.85 173.29 167.33 165.81 199.30 128.03 159.45 159.38 174.65 140.92 156.29 205.19 76.32 83.63 213.42 217.08 176.86 140.76 220.27 181.88 140.29 167.72 172.58 184.35 176.00 202.44 199.07 148.17 103.48 161.94 166.55 159.59 154.09 152.71 183.55 117.91 146.85 146.77 160.84 129.78 141.76 170.91 65.85 103.56 258.89 227.22 205.10 171.42 209.12 130.70 159.85 162.37 158.93 169.78 162.08 Sep 196.18 173.58 173.97 101.67 114.02 139.59 120.15 182.01 127.91 177.80 150.51 165.06 120.44 184.02 138.73 104.65 127.96 47.53 54.84 113.33 145.32 193.31 170.46 160.86 100.54 131.62 103.73 144.76 153.00 135.18 148.68 131.55 131.84 77.05 86.41 105.79 91.05 137.94 96.94 134.75 114.06 125.10 91.27 139.46 105.13 94.14 97.79 29.71 43.42 76.32 110.14 177.32 96.42 115.16 79.98 104.20 98.25 109.71 115.95 102.45 111.55 98.71 98.93 57.82 64.84 79.37 68.32 103.50 72.74 101.10 85.58 93.86 68.48 104.64 78.89 79.52 72.66 21.93 37.01 47.07 62.15 111.05 49.81 90.95 64.44 84.09 110.14 82.32 87.00 76.87 Oct 57.56 43.53 48.06 28.82 29.72 38.30 41.91 53.49 49.32 55.02 40.19 109.47 43.36 59.36 36.31 53.92 50.27 21.93 24.22 54.38 40.21 79.52 26.51 71.75 57.58 58.03 81.80 38.39 42.90 34.24 48.41 36.62 40.42 24.24 25.00 32.21 35.25 44.99 41.49 46.28 33.81 92.09 36.47 49.93 30.54 40.21 36.56 17.82 20.57 34.28 39.76 52.09 25.13 119.74 48.90 45.25 64.44 32.29 36.09 28.80 36.26 27.42 30.28 18.16 18.73 24.13 26.40 33.69 31.07 34.66 25.32 68.96 27.31 37.39 22.87 36.19 26.64 15.08 18.10 30.17 26.64 42.73 29.66 64.35 42.23 44.23 50.27 24.18 27.03 21.56 Nov 25.63 23.38 23.13 17.81 17.39 20.47 21.63 25.13 24.54 29.97 23.21 33.13 22.55 27.38 20.55 25.13 17.36 13.25 13.25 23.76 19.65 29.71 16.91 44.33 34.28 31.99 35.18 20.21 20.38 17.55 21.98 20.05 19.83 15.26 14.90 17.55 18.54 21.54 21.05 25.69 19.90 28.40 19.33 23.47 17.62 23.30 15.08 10.05 11.88 20.11 16.91 25.59 15.08 31.99 30.16 29.71 31.07 17.34 17.48 15.05 18.73 17.09 16.91 13.01 12.71 14.96 15.81 18.37 17.94 21.90 16.97 24.22 16.48 20.01 15.02 21.02 13.71 9.14 10.51 17.82 13.25 21.02 13.71 23.76 25.59 24.22 25.59 14.78 14.89 12.83 Dec 17.22 16.65 16.81 13.38 12.97 15.34 15.34 16.97 17.38 20.32 16.24 20.40 16.40 19.17 14.94 16.91 10.97 8.22 8.69 15.99 10.97 17.36 13.25 20.11 22.40 20.57 17.82 14.04 14.04 12.33 15.13 14.63 14.78 11.76 11.40 13.48 13.48 14.92 15.28 17.86 14.27 17.93 14.42 16.86 13.12 15.08 9.60 7.31 8.22 13.71 10.05 15.08 12.34 17.36 21.48 14.63 15.54 12.34 12.34 10.83 14.60 14.11 14.25 11.35 11.00 13.01 13.01 14.39 14.74 17.23 13.77 17.30 13.91 16.26 12.66 20.61 9.55 8.55 8.55 13.57 10.56 15.08 12.06 19.61 20.61 15.08 16.59 11.91 11.91 10.45 Jan 12.44 12.37 12.75 9.90 9.83 12.91 12.75 13.22 13.38 15.15 13.60 15.38 13.68 14.15 9.60 15.54 7.31 7.31 6.86 10.51 8.22 12.34 11.88 15.99 16.46 15.08 13.99 10.29 11.91 9.44 11.44 11.37 11.72 9.10 9.03 11.87 11.72 12.15 12.29 13.92 12.50 14.14 12.58 13.00 10.05 12.34 6.86 6.86 6.39 9.14 7.77 11.43 10.05 14.16 15.99 14.63 12.86 9.46 10.94 8.68 11.94 11.87 12.24 9.51 9.42 12.39 12.24 12.68 12.84 14.54 13.06 14.76 13.13 13.58 11.57 12.57 7.03 9.05 7.54 14.57 9.05 13.07 11.06 14.57 17.09 15.58 13.43 9.88 11.43 9.06 Feb 8.72 8.58 9.94 8.30 7.04 9.75 9.30 9.68 10.20 12.83 10.39 11.03 10.98 10.84 10.05 20.57 6.39 5.94 6.39 9.60 7.77 9.60 10.05 11.88 14.63 13.71 8.20 7.75 8.33 7.90 9.31 9.17 10.62 8.86 7.52 10.41 9.93 10.34 10.89 13.70 11.10 11.79 11.71 11.58 10.05 34.73 6.39 5.94 6.39 10.05 7.31 10.05 10.05 12.34 15.99 13.71 8.76 8.28 8.89 8.43 9.12 8.99 10.41 8.68 7.37 10.20 9.73 10.14 10.67 13.43 10.88 11.55 11.48 11.35 7.68 9.87 5.12 11.92 5.12 6.58 5.48 9.87 8.77 9.87 12.80 12.34 8.59 8.11 8.72 8.26 Mar 14.22 9.63 14.00 8.95 7.57 14.45 12.27 11.92 15.26 16.75 17.66 13.42 15.48 13.31 9.14 13.71 7.31 6.86 6.86 12.34 7.77 13.71 12.34 12.34 15.54 16.46 11.35 15.83 13.31 8.37 15.56 10.54 15.31 9.78 8.27 15.80 13.42 13.05 16.68 18.32 19.32 14.68 16.93 14.55 10.97 16.91 8.22 6.39 6.39 14.63 10.05 14.63 10.97 12.80 16.46 21.48 12.42 17.31 14.55 9.15 19.60 13.27 19.27 12.32 10.43 19.91 16.91 16.43 21.02 23.07 24.33 18.49 21.33 18.33 14.08 16.59 11.06 9.05 9.55 35.19 15.08 22.12 14.08 16.09 22.12 24.64 15.65 21.80 18.33 11.54 Apr 16.07 13.39 17.46 9.22 8.93 13.99 14.09 14.79 19.85 15.57 23.12 16.17 21.73 15.57 14.63 16.91 14.16 10.05 10.05 24.68 15.08 17.82 12.80 15.54 23.76 25.59 12.80 20.14 17.86 11.01 20.67 17.22 22.46 11.87 11.48 17.98 18.12 19.01 25.52 20.03 29.72 20.79 27.93 20.03 13.25 31.07 20.57 12.80 16.46 26.51 18.28 21.48 15.54 24.68 22.85 38.84 16.46 25.90 22.96 14.16 25.69 21.41 27.90 14.74 14.27 22.35 22.51 23.62 31.71 24.89 36.94 25.85 34.72 24.89 15.54 33.36 28.79 17.82 18.28 30.62 29.24 22.85 18.74 30.62 33.82 44.78 20.45 32.19 28.54 17.60 May 32.33 19.42 24.44 22.39 15.42 28.90 35.53 24.67 26.50 37.01 44.32 22.73 40.56 32.56 19.65 50.73 31.99 21.93 35.18 41.59 42.04 42.04 21.48 37.48 37.93 49.81 32.90 49.69 44.44 24.79 37.35 22.44 28.25 25.87 17.81 33.39 41.05 28.51 30.62 42.76 51.21 26.26 46.86 37.62 24.22 66.27 33.36 22.40 40.21 39.30 67.63 54.38 24.22 52.55 30.16 58.95 38.01 57.41 51.34 28.64 43.01 25.84 32.52 29.79 20.52 38.45 47.27 32.82 35.26 49.24 58.96 30.24 53.95 43.31 38.20 72.39 31.17 25.13 56.31 46.24 67.86 81.44 46.24 48.76 50.77 73.90 43.77 66.11 59.12 32.98

TOTAL 2243.91 2112.00 1954.51 1377.10 1589.61 1810.35 1921.28 1957.35 1973.03 2417.91 1832.09 2247.92 1773.63 2305.02 1613.01 1856.65 1982.91 895.05 1135.02 2113.39 2254.52 2325.47 2042.79 2318.91 2373.90 1997.62 2124.05 1898.79 2100.51 1801.57 ANNEXURE - 7.5

SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME

ASSESSMENT OF 90% DEPENDABLE YEAR

Sr No. YEAR ENERGY ENERGY POTENTIAL POT. (GWh) (GWh) IN DESC. ORDER 1 1962-63 2243.91 2417.91 2 1963-64 2112.00 2373.90 3 1964-65 1954.51 2325.47 4 1965-66 1377.10 2318.91 5 1966-67 1589.61 2305.02 6 1967-68 1810.35 2254.52 7 1968-69 1921.28 2247.92 8 1969-70 1957.35 2243.91 9 1970-71 1973.03 2124.05 10 1971-72 2417.91 2113.39 11 1972-73 1832.09 2112.00 12 1973-74 2247.92 2100.51 13 1974-75 1773.63 2042.79 14 1975-76 2305.02 1997.62 15 1976-77 1613.01 1982.91 16 1977-78 1856.65 1973.03 50% DEPENDABLE YEAR 17 1978-79 1982.91 1957.35 18 1979-80 895.05 1954.51 19 1980-81 1135.02 1921.28 20 1981-82 2113.39 1898.79 21 1982-83 2254.52 1856.65 22 1983-84 2325.47 1832.09 23 1984-85 2042.79 1810.35 24 1985-86 2318.91 1801.57 25 1986-87 2373.90 1773.63 26 1987-88 1997.62 1613.01 27 1988-89 2124.05 1589.61 28 1989-90 1898.79 1377.10 90% DEPENDABLE YEAR 29 1990-91 2100.51 1135.02 30 1991-92 1801.57 895.05 ANNEXURE - 7.6 SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME

POWER POTENTIAL WITH DIFFERENT INSTALLED CAPACITY IN A 90% DEPENDABLE YEAR

FRL 2120m GROSS HEAD 397.67m GEN. EFF. 98% MDDL 2110m WC LOSSES 8.7m TUR. EFF. 93.5% TWL 1719m NET HEAD 388.97m

MONTH INFLOWS POWER UNRESTRICTED INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. POTENTIALENERGY 160MW 170MW 180MW 190MW 200MW 210 MW 220MW 230MW 240MW 250MW POWER ENERGY POWER ENERGY POWER ENERGY POWER ENERGY POWER ENERGY POWER ENERGY POWER ENERGY POWER ENERGY POWER ENERGY POWER ENERGY (CUMECS) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) Jun 60.43 211.29 50.71 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 211.29 50.71 211.29 50.71 211.29 50.71 211.29 50.71 66.14 231.25 55.50 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 231.25 55.50 231.25 55.50 91.59 320.23 76.86 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 Jul 104.96 366.98 88.08 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 105.28 368.10 88.34 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 111.33 389.25 102.76 160.00 42.24 170.00 44.88 180.00 47.52 190.00 50.16 200.00 52.80 210.00 55.44 220.00 58.08 230.00 60.72 240.00 63.36 250.00 66.00 Aug 130.34 455.72 109.37 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 133.91 468.20 112.37 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 112.11 391.98 103.48 160.00 42.24 170.00 44.88 180.00 47.52 190.00 50.16 200.00 52.80 210.00 55.44 220.00 58.08 230.00 60.72 240.00 63.36 250.00 66.00 Sep 121.16 423.62 101.67 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 91.82 321.04 77.05 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 68.9 240.90 57.82 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 240.90 57.82 Oct 34.35 120.10 28.82 120.10 28.82 120.10 28.82 120.10 28.82 120.10 28.82 120.10 28.82 120.10 28.82 120.10 28.82 120.10 28.82 120.10 28.82 120.10 28.82 28.89 101.01 24.24 101.01 24.24 101.01 24.24 101.01 24.24 101.01 24.24 101.01 24.24 101.01 24.24 101.01 24.24 101.01 24.24 101.01 24.24 101.01 24.24 19.67 68.77 18.16 68.77 18.16 68.77 18.16 68.77 18.16 68.77 18.16 68.77 18.16 68.77 18.16 68.77 18.16 68.77 18.16 68.77 18.16 68.77 18.16 Nov 21.22 74.19 17.81 74.19 17.81 74.19 17.81 74.19 17.81 74.19 17.81 74.19 17.81 74.19 17.81 74.19 17.81 74.19 17.81 74.19 17.81 74.19 17.81 18.19 63.60 15.26 63.60 15.26 63.60 15.26 63.60 15.26 63.60 15.26 63.60 15.26 63.60 15.26 63.60 15.26 63.60 15.26 63.60 15.26 63.60 15.26 15.51 54.23 13.01 54.23 13.01 54.23 13.01 54.23 13.01 54.23 13.01 54.23 13.01 54.23 13.01 54.23 13.01 54.23 13.01 54.23 13.01 54.23 13.01 Dec 15.95 55.77 13.38 55.77 13.38 55.77 13.38 55.77 13.38 55.77 13.38 55.77 13.38 55.77 13.38 55.77 13.38 55.77 13.38 55.77 13.38 55.77 13.38 14.02 49.02 11.76 49.02 11.76 49.02 11.76 49.02 11.76 49.02 11.76 49.02 11.76 49.02 11.76 49.02 11.76 49.02 11.76 49.02 11.76 49.02 11.76 12.3 43.01 11.35 43.01 11.35 43.01 11.35 43.01 11.35 43.01 11.35 43.01 11.35 43.01 11.35 43.01 11.35 43.01 11.35 43.01 11.35 43.01 11.35 Jan 11.8 41.26 9.90 41.26 9.90 41.26 9.90 41.26 9.90 41.26 9.90 41.26 9.90 41.26 9.90 41.26 9.90 41.26 9.90 41.26 9.90 41.26 9.90 10.85 37.94 9.10 37.94 9.10 37.94 9.10 37.94 9.10 37.94 9.10 37.94 9.10 37.94 9.10 37.94 9.10 37.94 9.10 37.94 9.10 37.94 9.10 10.3 36.01 9.51 36.01 9.51 36.01 9.51 36.01 9.51 36.01 9.51 36.01 9.51 36.01 9.51 36.01 9.51 36.01 9.51 36.01 9.51 36.01 9.51 Feb 9.89 34.58 8.30 34.58 8.30 34.58 8.30 34.58 8.30 34.58 8.30 34.58 8.30 34.58 8.30 34.58 8.30 34.58 8.30 34.58 8.30 34.58 8.30 10.56 36.92 8.86 36.92 8.86 36.92 8.86 36.92 8.86 36.92 8.86 36.92 8.86 36.92 8.86 36.92 8.86 36.92 8.86 36.92 8.86 36.92 8.86 12.93 45.21 8.68 45.21 8.68 45.21 8.68 45.21 8.68 45.21 8.68 45.21 8.68 45.21 8.68 45.21 8.68 45.21 8.68 45.21 8.68 45.21 8.68 Mar 10.66 37.27 8.95 37.27 8.95 37.27 8.95 37.27 8.95 37.27 8.95 37.27 8.95 37.27 8.95 37.27 8.95 37.27 8.95 37.27 8.95 37.27 8.95 11.66 40.77 9.78 40.77 9.78 40.77 9.78 40.77 9.78 40.77 9.78 40.77 9.78 40.77 9.78 40.77 9.78 40.77 9.78 40.77 9.78 40.77 9.78 13.35 46.68 12.32 46.68 12.32 46.68 12.32 46.68 12.32 46.68 12.32 46.68 12.32 46.68 12.32 46.68 12.32 46.68 12.32 46.68 12.32 46.68 12.32 Apr 10.99 38.43 9.22 38.43 9.22 38.43 9.22 38.43 9.22 38.43 9.22 38.43 9.22 38.43 9.22 38.43 9.22 38.43 9.22 38.43 9.22 38.43 9.22 14.14 49.44 11.87 49.44 11.87 49.44 11.87 49.44 11.87 49.44 11.87 49.44 11.87 49.44 11.87 49.44 11.87 49.44 11.87 49.44 11.87 49.44 11.87 17.57 61.43 14.74 61.43 14.74 61.43 14.74 61.43 14.74 61.43 14.74 61.43 14.74 61.43 14.74 61.43 14.74 61.43 14.74 61.43 14.74 61.43 14.74 May 26.68 93.28 22.39 93.28 22.39 93.28 22.39 93.28 22.39 93.28 22.39 93.28 22.39 93.28 22.39 93.28 22.39 93.28 22.39 93.28 22.39 93.28 22.39 30.83 107.79 25.87 107.79 25.87 107.79 25.87 107.79 25.87 107.79 25.87 107.79 25.87 107.79 25.87 107.79 25.87 107.79 25.87 107.79 25.87 107.79 25.87 32.27 112.83 29.79 112.83 29.79 112.83 29.79 112.83 29.79 112.83 29.79 112.83 29.79 112.83 29.79 112.83 29.79 112.83 29.79 112.83 29.79 112.83 29.79

Total energy (GWh) 1377.10 821.57 850.85 880.13 909.41 938.69 967.97 995.16 1022.04 1046.82 1069.12

Lean Period Power (MWc) 39.63 39.63 39.63 39.63 39.63 39.63 39.63 39.63 39.63 39.63 (Jan. - Mar. )

Incr. Energy(GWh) - 29.28 29.28 29.28 29.28 29.28 27.19 26.88 24.78 22.30

Incr. Cap.(MW) - 10 10 10 10 10 10 10 10 10

Incr. Energy/Incr. Power (kWh/kW) - 2928.00 2928.00 2928.00 2928.00 2928.00 2718.88 2688.00 2478.02 2229.62 ANNEXURE - 7.7

SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME

INCREMENTAL ENERGY BENEFITS ( 90% DEPENDABLE YEAR )

S. NO. INST. ANNUAL ENERGY ANNUAL L.F LEAN FLOW KWh/ KW d (KWh)/ CAP.(MW) GEN (GWh) (%) L.F (%) d (KW)

1 160 821.57 58.62 24.77 5134.83 - 2 170 850.85 57.13 23.31 5005.01 2928.00 3 180 880.13 55.82 22.01 4889.63 2928.00 4 190 909.41 54.64 20.86 4786.38 2928.00 5 200 938.69 53.58 19.81 4693.46 2928.00 6 210 967.97 52.62 18.87 4609.39 2928.00 7 220 995.16 51.64 18.01 4523.46 2718.88 8 230 1022.04 50.73 17.23 4443.66 2688.00 9 240 1046.82 49.79 16.51 4361.76 2478.02 10 250 1069.12 48.82 15.85 4276.47

SIRKARI BHYOL RUSIABAGAR HYDEL SCHEME

3500.00

3000.00

2500.00

2000.00

d (kWh) / d (kW) d / (kWh) d 1500.00

1000.00 170 180 190 200 210 220 230 240 250 INSTALLED CAPACITY (MW) ANNEXURE - 7.8 SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME

POWER POTENTIAL WITH DIFFERENT INSTALLED CAPACITY IN A 50% DEPENDABLE YEAR

FRL 2120 m GROSS HEAD 397.67 m GEN. EFF. 98 % MDDL 2110 m WC LOSSES 8.7 m TUR. EFF. 93.5 % TWL 1719m NET HEAD 388.97m

MONTH INFLOWS POWER UNRESTRICTED INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. INSTALLED CAP. POTENTIAL ENERGY 160MW 170MW 180MW 190MW 200MW 210 MW 220MW 230MW 240MW 250MW POWER ENERGY POWER ENERGY POWER ENERGY POWER ENERGY POWER ENERGY POWER ENERGY POWER ENERGY POWER ENERGY POWER ENERGY POWER ENERGY (CUMECS) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) (MWc) (GWh) Jun 70.36 246.01 59.04 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 246.01 59.04 77.01 269.26 64.62 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 106.63 372.82 89.48 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 Jul 171.78 600.61 144.15 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 172.3 602.43 144.58 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 182.19 637.01 168.17 160.00 42.24 170.00 44.88 180.00 47.52 190.00 50.16 200.00 52.80 210.00 55.44 220.00 58.08 230.00 60.72 240.00 63.36 250.00 66.00 Aug 192.34 672.49 161.40 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 197.6 690.89 165.81 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 165.44 578.44 152.71 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 Sep 152.43 532.95 127.91 160.00 42.24 170.00 44.88 180.00 47.52 190.00 50.16 200.00 52.80 210.00 55.44 220.00 58.08 230.00 60.72 240.00 63.36 250.00 66.00 115.52 403.90 96.94 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 86.68 303.07 72.74 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 210.00 50.40 220.00 52.80 230.00 55.20 240.00 57.60 250.00 60.00 Oct 58.78 205.52 49.32 160.00 38.40 170.00 40.80 180.00 43.20 190.00 45.60 200.00 48.00 205.52 49.32 205.52 49.32 205.52 49.32 205.52 49.32 205.52 49.32 49.44 172.86 41.49 160.00 38.40 170.00 40.80 172.86 41.49 172.86 41.49 172.86 41.49 172.86 41.49 172.86 41.49 172.86 41.49 172.86 41.49 172.86 41.49 33.66 117.69 31.07 117.69 31.07 117.69 31.07 117.69 31.07 117.69 31.07 117.69 31.07 117.69 31.07 117.69 31.07 117.69 31.07 117.69 31.07 117.69 31.07 Nov 29.25 102.27 24.54 102.27 24.54 102.27 24.54 102.27 24.54 102.27 24.54 102.27 24.54 102.27 24.54 102.27 24.54 102.27 24.54 102.27 24.54 102.27 24.54 25.08 87.69 21.05 87.69 21.05 87.69 21.05 87.69 21.05 87.69 21.05 87.69 21.05 87.69 21.05 87.69 21.05 87.69 21.05 87.69 21.05 87.69 21.05 21.38 74.75 17.94 74.75 17.94 74.75 17.94 74.75 17.94 74.75 17.94 74.75 17.94 74.75 17.94 74.75 17.94 74.75 17.94 74.75 17.94 74.75 17.94 Dec 20.71 72.41 17.38 72.41 17.38 72.41 17.38 72.41 17.38 72.41 17.38 72.41 17.38 72.41 17.38 72.41 17.38 72.41 17.38 72.41 17.38 72.41 17.38 18.21 63.67 15.28 63.67 15.28 63.67 15.28 63.67 15.28 63.67 15.28 63.67 15.28 63.67 15.28 63.67 15.28 63.67 15.28 63.67 15.28 63.67 15.28 15.97 55.84 14.74 55.84 14.74 55.84 14.74 55.84 14.74 55.84 14.74 55.84 14.74 55.84 14.74 55.84 14.74 55.84 14.74 55.84 14.74 55.84 14.74 Jan 15.94 55.73 13.38 55.73 13.38 55.73 13.38 55.73 13.38 55.73 13.38 55.73 13.38 55.73 13.38 55.73 13.38 55.73 13.38 55.73 13.38 55.73 13.38 14.65 51.22 12.29 51.22 12.29 51.22 12.29 51.22 12.29 51.22 12.29 51.22 12.29 51.22 12.29 51.22 12.29 51.22 12.29 51.22 12.29 51.22 12.29 13.91 48.63 12.84 48.63 12.84 48.63 12.84 48.63 12.84 48.63 12.84 48.63 12.84 48.63 12.84 48.63 12.84 48.63 12.84 48.63 12.84 48.63 12.84 Feb 12.15 42.48 10.20 42.48 10.20 42.48 10.20 42.48 10.20 42.48 10.20 42.48 10.20 42.48 10.20 42.48 10.20 42.48 10.20 42.48 10.20 42.48 10.20 12.98 45.38 10.89 45.38 10.89 45.38 10.89 45.38 10.89 45.38 10.89 45.38 10.89 45.38 10.89 45.38 10.89 45.38 10.89 45.38 10.89 45.38 10.89 15.9 55.59 10.67 55.59 10.67 55.59 10.67 55.59 10.67 55.59 10.67 55.59 10.67 55.59 10.67 55.59 10.67 55.59 10.67 55.59 10.67 55.59 10.67 Mar 18.18 63.56 15.26 63.56 15.26 63.56 15.26 63.56 15.26 63.56 15.26 63.56 15.26 63.56 15.26 63.56 15.26 63.56 15.26 63.56 15.26 63.56 15.26 19.88 69.51 16.68 69.51 16.68 69.51 16.68 69.51 16.68 69.51 16.68 69.51 16.68 69.51 16.68 69.51 16.68 69.51 16.68 69.51 16.68 69.51 16.68 22.77 79.61 21.02 79.61 21.02 79.61 21.02 79.61 21.02 79.61 21.02 79.61 21.02 79.61 21.02 79.61 21.02 79.61 21.02 79.61 21.02 79.61 21.02 Apr 23.65 82.69 19.85 82.69 19.85 82.69 19.85 82.69 19.85 82.69 19.85 82.69 19.85 82.69 19.85 82.69 19.85 82.69 19.85 82.69 19.85 82.69 19.85 30.41 106.33 25.52 106.33 25.52 106.33 25.52 106.33 25.52 106.33 25.52 106.33 25.52 106.33 25.52 106.33 25.52 106.33 25.52 106.33 25.52 106.33 25.52 37.79 132.13 31.71 132.13 31.71 132.13 31.71 132.13 31.71 132.13 31.71 132.13 31.71 132.13 31.71 132.13 31.71 132.13 31.71 132.13 31.71 132.13 31.71 May 31.58 110.42 26.50 110.42 26.50 110.42 26.50 110.42 26.50 110.42 26.50 110.42 26.50 110.42 26.50 110.42 26.50 110.42 26.50 110.42 26.50 110.42 26.50 36.49 127.58 30.62 127.58 30.62 127.58 30.62 127.58 30.62 127.58 30.62 127.58 30.62 127.58 30.62 127.58 30.62 127.58 30.62 127.58 30.62 127.58 30.62 38.2 133.56 35.26 133.56 35.26 133.56 35.26 133.56 35.26 133.56 35.26 133.56 35.26 133.56 35.26 133.56 35.26 133.56 35.26 133.56 35.26 133.56 35.26

Total energy (GWh) 1973.03 979.96 1014.04 1046.41 1078.09 1109.77 1140.37 1169.65 1198.93 1228.21 1256.53

Lean Period Power (MWc) 56.86 56.86 56.86 56.86 56.86 56.86 56.86 56.86 56.86 56.86 (Jan. - Mar. )

Incr. Energy(GWh) - 34.08 32.37 31.68 31.68 30.60 29.28 29.28 29.28 28.32

Incr. Cap.(MW) - 10 10 10 10 10 10 10 10 10

Incr. Energy/Incr. Power (kWh/kW) - 3408.00 3236.67 3168.00 3168.00 3060.42 2928.00 2928.00 2928.00 2832.13 ANNEXURE- 7.9

SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME

CAPACITY AND ENERGY BENEFITS IN 90% DEPENDABLE YEAR (1965-66)

PERIOD INFLOWS POTENTIAL OUTPUT IC=210MW DESIGN ENERGY (Cumecs) (MWc)

MWc GWh MWc GWh JUN - 1 60.43 211.29 210.00 50.40 199.50 47.88 JUN - 2 66.14 231.25 210.00 50.40 199.50 47.88 JUN - 3 91.59 320.23 210.00 50.40 199.50 47.88 JUL - 1 104.96 366.98 210.00 50.40 199.50 47.88 JUL - 2 105.28 368.10 210.00 50.40 199.50 47.88 JUL - 3 111.33 389.25 210.00 55.44 199.50 52.67 AUG - 1 130.34 455.72 210.00 50.40 199.50 47.88 AUG - 2 133.91 468.20 210.00 50.40 199.50 47.88 AUG - 3 112.11 391.98 210.00 55.44 199.50 52.67 SEP - 1 121.16 423.62 210.00 50.40 199.50 47.88 SEP - 2 91.82 321.04 210.00 50.40 199.50 47.88 SEP - 3 68.9 240.90 210.00 50.40 199.50 47.88 OCT - 1 34.35 120.10 120.10 28.82 120.10 28.82 OCT - 2 28.89 101.01 101.01 24.24 101.01 24.24 OCT - 3 19.67 68.77 68.77 18.16 68.77 18.16 NOV - 1 21.22 74.19 74.19 17.81 74.19 17.81 NOV - 2 18.19 63.60 63.60 15.26 63.60 15.26 NOV - 3 15.51 54.23 54.23 13.01 54.23 13.01 DEC - 1 15.95 55.77 55.77 13.38 55.77 13.38 DEC - 2 14.02 49.02 49.02 11.76 49.02 11.76 DEC - 3 12.3 43.01 43.01 11.35 43.01 11.35 JAN - 1 11.8 41.26 41.26 9.90 41.26 9.90 JAN - 2 10.85 37.94 37.94 9.10 37.94 9.10 JAN - 3 10.3 36.01 36.01 9.51 36.01 9.51 FEB - 1 9.89 34.58 34.58 8.30 34.58 8.30 FEB - 2 10.56 36.92 36.92 8.86 36.92 8.86 FEB - 3 12.93 45.21 45.21 8.68 45.21 8.68 MAR - 1 10.66 37.27 37.27 8.95 37.27 8.95 MAR - 2 11.66 40.77 40.77 9.78 40.77 9.78 MAR - 3 13.35 46.68 46.68 12.32 46.68 12.32 APR - 1 10.99 38.43 38.43 9.22 38.43 9.22 APR - 2 14.14 49.44 49.44 11.87 49.44 11.87 APR - 3 17.57 61.43 61.43 14.74 61.43 14.74 MAY - 1 26.68 93.28 93.28 22.39 93.28 22.39 MAY - 2 30.83 107.79 107.79 25.87 107.79 25.87 MAY - 3 32.27 112.83 112.83 29.79 112.83 29.79

TOTAL 1417.91 1377.10 967.97 937.23 (Mcum) ( GWh) ANNEXURE - 7.10

SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME

SUMMARY OF POWER POTENTIAL STUDIES (1962-63 TO 1991-92)

Sr No. YEAR ANNUAL ENERGY ENERGY ANNUAL LF. LEAN FLOW INFLOWS POTENTIAL GEN. with (%) (M cum) (GWh) IC=210MW (GWh)

MWc LF(%) 1 1962-63 2310.41 2243.91 1150.70 62.55 12.48 5.94 2 1963-64 2174.59 2112.00 1043.88 56.74 10.64 5.07 3 1964-65 2012.43 1954.51 1105.84 60.11 12.92 6.15 4 1965-66 1417.91 1377.10 967.97 52.62 9.49 4.52 5 1966-67 1636.72 1589.61 933.14 50.72 8.50 4.05 6 1967-68 1864.00 1810.35 1067.11 58.01 13.08 6.23 7 1968-69 1978.22 1921.28 1103.10 59.96 12.03 5.73 8 1969-70 2015.35 1957.35 1108.30 60.25 12.18 5.80 9 1970-71 2031.50 1973.03 1140.37 61.99 13.69 6.52 10 1971-72 2489.57 2417.91 1210.39 65.80 15.74 7.50 11 1972-73 1886.38 1832.09 1190.37 64.71 14.76 7.03 12 1973-74 2314.54 2247.92 1179.78 64.13 13.91 6.63 13 1974-75 1826.19 1773.63 1172.32 63.73 14.15 6.74 14 1975-76 2373.33 2305.02 1170.43 63.62 13.41 6.39 15 1976-77 1660.81 1613.01 1017.20 55.29 10.35 4.93 16 1977-78 1911.68 1856.65 1228.30 66.77 16.98 8.09 17 1978-79 2041.68 1982.91 1030.36 56.01 7.30 3.48 18 1979-80 921.57 895.05 800.25 43.50 7.70 3.67 19 1980-81 1168.66 1135.02 916.38 49.81 6.83 3.25 20 1981-82 2176.02 2113.39 1162.91 63.22 13.62 6.49 21 1982-83 2321.33 2254.52 1091.87 59.35 8.72 4.15 22 1983-84 2394.38 2325.47 1209.10 65.73 12.98 6.18 23 1984-85 2103.33 2042.79 1017.21 55.30 11.03 5.25 24 1985-86 2387.64 2318.91 1241.04 67.46 13.34 6.35 25 1986-87 2444.25 2373.90 1257.28 68.35 16.34 7.78 26 1987-88 2056.82 1997.62 1303.44 70.85 16.40 7.81 27 1988-89 2187.00 2124.05 1177.38 64.00 11.69 5.57 28 1989-90 1955.06 1898.79 1142.82 62.12 12.08 5.75 29 1990-91 2162.76 2100.51 1137.99 61.86 11.82 5.63 30 1991-92 1854.96 1801.57 988.52 53.74 8.98 4.28 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

CHAPTER-VIII

POWER EVACUATION

8.1 APPRAISAL OF EXISTING POWER EVACUATION FACILITIES

The Project is located at latitude 30-10-16 (D-M-S) North and longitude 80- 15-7 (D-M-S) East. The installed capacity of Uttaranchal State is 1286.15 MW as on March 2003. Its peak demand has been estimated as 771 MW whereas the met peak is 705 MW in the present scenario. This amounts to deficit of 66 MW (8.56%). Accordingly, energy requirement is 3774 MU against the available energy of about 3670 MU. This depicts deficit of 104 MU (2.8%). For the purpose of evacuation of power pooling has been proposed for various Hydro Electric Power Projects. As per the geographical locations the following proposed Hydel Projects lie between the longitude 78.5 o N to 79.5 o N namely Harsil, Bhaironghati, Gangotri, Jadhganga, Karmoli Hydro Power Projects. The next group of Hydro Electric Projects which lie between longitude 79.3 o E to 80 o E are Badrinath, Gohana Tal, Rishiganga II, Rishiganga I, Jelum Tamak, Deodi, Devasari Dam and Malari Jelum. Whereas in the next series the Hydro Electric Projects which lie between longitude 80 o E to 81 o E are Mapang Bogudiyar, Sirkari Bhyol Bogudiyar, Sirkari Bhytol Rus Bagar, Khasiya Bara, Khartoli Lumti Talli, Kalika Dantu, Garba Tawaghat, Sobala Jhimrigaon, Sela Urthing, Chhunger Chal, Bokang Beiling. The power map of Uttranchal as on 1/1/2002 is shown at Annex-8.1.

8.2 PROPOSED EVACUATION SYSTEM TO NEAREST FACILITY

A map has already been prepared indicating various proposed Hydro Electric Projects for the purpose of preparation of prefeasibility report (PFR) indicating their locations which may be seen at Annex-8.2.

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8.3 ARRANGEMENT FOR EVACUATION OF POWER FROM SIRKARI BHYOL RUPSIABAGAR HEP

The 210 MW power generated at 11 kV at Sirkari Bhyol Rupsiabagar HEP will be stepped upto 220 kV by unit step-transformers. The 210 MW power would be transmitted to nearby Rupsia Bagar – Khasiabara HEP by 220 kV D/C line. Proposed line from Sirkari Bhyol Rupsiabagar to Rupsia Bagar- Khasibara HEP for evacuation of power is shown at Annexure - 8.3.

8.4 ROUTE LENGTH AND COSTING OF 220 KV TRANSMISSION LINE FOR EVACUATION OF POWER FROM SIRKARI BHYOL RUPSIABAGAR HEP

The power of this project is intended to be evacuated by proposed 220 kV D/C line to Rupsia Bagar – Khasiabara HEP. The length of line has been estimated as 8 km (220 kV D/C line) from Sirkari Bhyol Rupsiabagar to Rupsia Bagar – Khasibara HEP. The cost of this line is estimated as Rs. 6.0 Crores.

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CHAPTER – IX

INITIAL ENVIRONMENTAL EXAMINATION STUDIES

9.1. INTRODUCTION

The Initial Environmental Examination of Sirkari Bhyol Rupsiabagar hydroelectric project has following objectives through various phases of development which are proposed to be covered.

• provide information on baseline environmental setting; • preliminary assessment of impacts likely to accrue during construction and operation phases; • identify key issues which need to be studied in detail during subsequent environmental studies

It is essential to ascertain the baseline status of relevant environmental parameters that could undergo significant changes as a result of construction and operation of the project. In an Initial Environmental Examination (IEE) study, baseline status is ascertained through review of secondary data, reconnaissance survey and interaction with the locals.

The Preliminary Impact Assessment conducted as a part of IEE Study, is essentially a process to forecast the future environmental scenario of the project area that might be expected to occur as a result of construction and operation of the proposed project. The key environmental impacts which are likely to accrue as a result of the proposed developmental activity are identified. Various impacts, which can endanger the environmental sustainability of a project, are highlighted for comprehensive assessment as a part of next level of environmental study during detailed studies.

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9.2 ENVIRONMENTAL BASELINE SETTING

The study area covered includes the area within 7 km radius of various project appurtenances. The data was collected through review of existing documents and various engineering reports and reconnaissance surveys.

The various parameters for which baseline setting has been described have been classified into physio-chemical, ecological and socio-economic aspects.

9.2.1 Physio-Chemical Aspects

a) Water Quality

The proposed project is located in an area with low population density. Such areas are characterised by absence of pollution sources, which is also reflected in excellent water quality.

The present population in the catchment area intercepted at the diversion structure site is of the order of 500. The major source of water in the project area rivers or nallahs which flow adjacent to the habitations, which are conveyed to the consumers under gravity. The sewage so generated, too outfalls into various streams or nallahs flowing adjacent to the settlements. The total BOD loading from domestic sources in the catchment area is of the order of 25 kg/day. The effluent ultimately reaches river Goriganga through various streams/channels outfalling into the river. The quantity of BOD loading is insignificant to cause any adverse impact on water quality, even for the minimum flow in the river. There are no industries in the area. Likewise, use of agro-chemicals is negligible in the catchment area.

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Thus, in absence of pollution sources, water quality is excellent in the area. b) Landuse

The landuse pattern of the submergence area of the proposed diversion structure was ascertained using satellite data and the same is given in Table-9.1, and the same is appended as Figure-9.1. The FCC of the study area is given as Figure-9.2.

Table-9.1 Landuse pattern of the submergence area S. No. Landuse / Land cover Area (ha) 1. Forest area with dense 9.09 vegetation 2. Grass lands 1.79 3. Water bodies 1.92 Total 12.80

The major land cover category in the submergence area is forest area with dense vegetation (9.09 ha). About 1.79 ha of the submergence area is under grasslands and the balance, i.e. 1.92 ha is under water bodies.

As a part of next phase of Environmental study, it is recommended that detailed studies be conducted to ascertain the ownership status of these lands, i.e. whether the land belongs Forest Department or is it a non-forest government land. The pastures could still be categorized as forest land, as far as ownership status is concerned. In such a scenario, compensatory afforestation as per the norms of Forest

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Conservation Act (1980) will have to be done in lieu of entire forest land as per ownership, irrespective of its vegetal status.

9.2.2 Ecological aspects

a) Vegetation

The proposed project site lies in western Himalayas. The nature and type of vegetation occurring in an area depends upon a combination of various factors including prevailing climatic conditions altitude, topography, slope, biotic factors, etc.

The proposed project area lies between EL.1700 m and 2000 m and the vegetation in the area can be broadly categorised as cool temperate forests. Amongst the various categories of temperate forests, Kharsu Oak forest is is dominant category in the project area and its surroundings. The major species observed in the area is Kharsu (Quercus semicarpifolia ), found in association with Fir ( Abies pindrow ) and Thuner ( Taxus bactata ).

Within the study area, Kharsu and Fir in association with Ringal (Thamnocalamus spathiphloga) are observed. At upper reaches Bhojpatra ( Betula utilis ) is observed. A number of medicinal plant including Jatamashi, Vajardanti, Banajvayan, Brahmi, Dhoop, etc. are also observed in the study area. The list of major floral species observed in the study area is given in Table-9.2.

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Table-9.2 Major floral species reported in the study area Local N ame Scientific Name Trees Thuner Taxuz bacata Kharsu Quercus semicarpifolia Raga/fir Abies pindrow Bhojpatra Betula utilis

Local Name Scientific Name Moru Quercus floribunda Akhrot Juglans regia Ringal Thamnocalamus sapthiphloga Shrubs Aatis Aconitum heterophyllum Kapoor kachari Hedychinum spicatum Kutki Picrotchiza kurroa Jatamashi Nardostachys grandifolia Vajradanti Potentilla fulgens Banajvayan Thymus resphyllum Bankakri Podophyllum emodi Brahmi Centilla asiatica Dhoop Juniperus recurva) Gol Ringal Chimonobambusa falcata Tham Ringal Thamnocalamus spathiflorus Kalajeera Ipomia hedraka (M) Hans Raj Curculigo orchioides (M)

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b) Fauna

Dense Oak forest is observed in the project area and its surroundings. Based on the review of secondary data and interaction with the locals and Forest Department, major faunal species observed in the project area and the study area include Musk Deer and Snow Leopard. Both the species belongs to schedule I category the Wildlife Protection Act (1972). Apart from lizard, no major reptilian species are observed in the project area are study area. Amongst the avi-fauna, the commonly observed species include Monal & Tibetian crow.

The list of faunal species observed in the study area including project area is outlined in Table-9.3.

Table-9.3 List of faunal species observed in the study area including project area Common Name Zoological Name Schedule as per Wildlife Protection Act Mammals Kasturia Moschus moschiferus Schedule – I Snow Leopard Panthera uncia Schedule – I Barking Deer Muntiacus muntjak Reptiles Lizard Hemidactyles brooki Avi-fauna Monal Zophophorus impejanus Schedule – I Crow Corvus spendens Black tibbatian crow Corvus macrorhynchas (M) Chakor Alectoria gracia

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Black Tit Lophophanus ruphonuchalis Brown Tit Lophophanes dichorous White Tailed nuthatch Sitta himalayensis

It is observed that quite a few faunal species belong to schedule-I species, as categorised in the Wildlife Protection Act (1972). Such species need to be protected. Hence, it is recommended that detailed studies be conducted as a part of EIA study, to ascertain the spatial occurrence of such species and to assess impacts on them.

c) Fisheries

The project is on river Goriganga which is the major tributary of river Kali. The Goriganga & its tributaries having glacial origin as a result of which, water temperate is low. The temperature, current velocity and natural biota are the factors governing the growth of fishes in the water body. Based on field observations and interaction at the field level, it can be concluded that small size fishes are available in river Goriganga and its tributaries.

The major fish species reported in the area are Mahaseer ( Tor tor, Tor. putitora ), snow trout ( Schizothorax simaatus, Schizothorax.plagioslames, Schizothorax richardsonii ) and Minor carps. Mahaseer and snow trout are migratory fish species.

Snow trout is endemic to Himalayas and known to occur in almost all streams and river of Pithoragarh and constitute the main fishery. In the winter months, the snow trout migrates from the upper reaches

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downstream for a considerable distance and constitute major fishries in the projects area. Mahaseer is one of the finest group of sport fishes, which during spring and summer months they migrates upward and breeds in smaller tributaries. It is recommended that detailed fishery survey be conducted in the river as a part of EIA study to ascertain the spatio-temporal occurrence of Mahaseer and snow trout. Minor carps such as Labeo dero and Labeo diocheilus have less commercial value and are caught by local fishermen and are consumed locally. Tank and pond fisheries is not in vogue in the project area.

9.2.3 Socio-economic aspects

It is imperative to study socio-economic characteristics including demographic profile of the project area and the study area. The proposed project lies in tehsil Munsiyari of district Pithoragarh. Likewise, the entire study area, too lies within tehsil Munsiyari of district Pithoragarh. The demographic profile of the study area villages is given in Table-9.4.

Table-9.4 Demographic profile of the study area villages S. Village No. of Population SC ST Literates No households Male Female Total Mal Femal e e 1. Khilach 8 13 21 34 25 9 6 1 2. Laspa 12 20 11 31 7 23 13 0 3. Liva 1 4 3 7 0 7 4 1 4. Martoli 13 27 4 31 7 17 21 1 5. Potting 2 03 01 04 0 02 0 0 6. Ralam 12 22 20 42 4 30 13 0 7. Rilkot 2 5 0 5 0 5 2 0 8. Tola 57 112 72 184 57 11 72 7 5 Total 32 72 69 141 28 45 44 22

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The average family size in the study area villages is about 4.4, with a total population of 184 based on 1991 census. Considering a decadal growth rate of 25%, the present population is of the order of 180. All the villages in the study area are migratory in nature, as villagers move to lower reaches during winter season and return back in the summer months. The SC and ST population in the study area village is 19.6% and 31.9% respectively. The literacy rate in study area villages is 46.8%. The male and female literacy rates are 61.1% and 31.9% respectively.

9.3 PREDICTION OF IMPACTS

Based on the project details and the baseline environmental status, potential impacts as a result of the construction and operation of the proposed project have been identified. As a part of IEE study, impacts on various aspects listed as below have been assessed:

- Land environment - Water resources - Water quality - Terrestrial flora - Terrestrial fauna - Aquatic ecology - Noise environment - Ambient air quality - Socio-economic environment

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9.3.1 Impacts on land environment

(a) Construction Phase

Quarrying operations

A hydroelectric project requires significant amount of construction material, which needs to be extracted from various quarry sites in and around the project area. Normally quarrying is done along the hill face, and generally left untreated after extraction of the required construction material. These sites can become permanent scar on the hill face and can become potential source of landslides. This aspect needs to be covered as a part of the EIA study and suitable measures for quarry site stabilization be recommended. At the present level of information, can be recommended that to the extent possible, existing quarries be tapped for extraction of construction material. However, if new quarries are to be opened, then the same can be located on non-forest land.

Operation of construction equipment

During construction phase, various equipment will be brought to the site. These include crushers, batching plant, drillers, earth movers, rock bolters, etc. The siting of these construction equipment would require significant amount of space. Similarly, space will be required for workshop, storing of other construction equipment and materials, etc. In addition, land will also be temporarily acquired, for storage of the quarried material before crushing, rubble, sand crushed material, cement, spare parts yard, fuel storage, guard room, parking of light and heavy vehicles, petrol & diesel pumps, temporary & permanent residential colonies for government and contractor’s labour, water

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supply and switch yard for construction purposes, etc. Various storage sites need to be earmarked for this purpose. It is recommended that to the extent possible, such sites are located over non-forest land.

Problems of muck disposal

A large quantity of muck is expected to be generated as a result of tunneling operations, construction of access roads, etc. The muck so generated needs to be properly disposed otherwise it can lead to significant adverse impacts on environment. Normally muck is disposed along the river bank which ultimately finds it way into the water body, leading to adverse impacts on riverine ecology.

The other option is to dispose muck over low lying areas. Efforts need to be made so that the site selected for muck disposal has minimum vegetation and is a non-forest land. After disposal of muck, the site needs to be stabilized using bio-engineering measures. Specific site specific management measures can be suggested as a part of EIA study.

Construction of roads

The topography of the project area has steep to precipitous slopes which descends rapidly into narrow valleys. Construction of roads in such area can give rise to erosion hazards due to net downhill movement of soil aggregates, if adequate protection measures are not undertaken. The project construction would entail significant vehicular movement for transportation of large construction material, heavy construction equipment. Most of the roads in the project area, would require widening. Many new roads shall be constructed. Construction

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of new roads may lead to removal of trees on slopes and re-working of the slopes in the immediate vicinity of road, which may lead to landslides, soil erosion, gully formation, etc. Adequate management measures need to be implemented to ameliorate such impacts.

b) Operation Phase

The area coming under reservoir submergence is 12.8 ha (considering FRL as 2,120 m). In addition to above, an area of 50-55 ha will be required for siting of various project appurtenances, infrastructure, etc. It is recommended that to the extent possible, such sites be located over non-forest land. The ownership category of land required for various project appurtenances can be ascertained, once project layout is finalized as a part of DPR preparation.

9.3.2 Impacts on water resources

The construction of barrage as a part of the proposed project diversion of discharge for hydropower generation would lead to reduction in flow for a river stretch of about 4.0 km downstream of the barrage site up to the confluence point of tail race discharge. Since there are no users in the intervening stretch, hence, reduction in flow during lean season is unlikely to lead to any significant impact. However, reduction in flow is likely to have a minor impact on riverine ecology as the discharge during lean flow is significantly less, but intervening nallahs and streams do supplement the minimum flow in the stretch under study.

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9.3.3 Impacts on water quality

a) Construction phase

The project construction is likely to last for a period of 4-5 years. About 2000 workers and 500 technical staff are likely to work during project construction phase. The construction phase, also leads to mushrooming of various allied activities to meet the demands of the immigrant labour population in the project area. Thus, the total increase in labour population during construction phase is expected to around 5000-6000. The total quantum of sewage generated is expected to be of the order of 0.4 mld. The BOD load contributed by domestic sources will be about 270 kg/day. The sewage would be disposed in nearby streams or channels under gravity through open drains, where ultimately it will find its way into river Goriganga. The inadequate sewage treatment and disposal facilities could lead to increased incidence of water-borne diseases. Thus, it is recommended to commission adequate sewage treatment facilities in the labour camps.

b) Operation phase

Effluent from project colony

In the operation phase, about 200 families will be residing in the area which would generate about 0.15 mld of sewage. The quantum of sewage generated is not expected to cause any significant adverse impact on riverine water quality. Adequate sewage treatment facilities including secondary treatment facilities need to be commissioned for this purpose to ameliorate whatever marginal impact that is expected to occur.

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Impacts on reservoir water quality

The flooding of forest and agricultural land in the submergence area increases the availability of nutrients resulting from decomposition of vegetative matter. Enrichment of impounded water with organic and inorganic nutrients becomes a major water quality problem immediately on commencement of the operation and is likely to continue in initial years of operation. It is recommended that a detailed D.O. modelling be done to estimate the D.O. level in the reservoir during its initial years of operation.

Eutrophication risks

The fertilizer use in the catchment area intercepted at the diversion structure site is nil and is unlikely to change even during project operation phase. Since, the present proposal envisages only hydropower generation and does not entail command area development, problems of eutrophication, which are primarily caused by enrichment of nutrients in water are not anticipated. Being a Run- off-the-river scheme, no eutrophication risks are expected.

9.3.4 Impacts on terrestrial flora

a) Construction phase

Increased human interferences

As mentioned earlier, about 2,500 technical staff, workers and other group of people are likely to congregate in the area during the project construction phase. The total increase in population is expected to be

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about 5000-6000. Workers and other population groups residing in the area may use fuel wood, if no alternate fuel is provided. On an average, the fuel wood requirements will be of the order of 2500-2700 m3. Thus, every year, fuel wood equivalent to about 800-900 trees will be cut, which implies that every year on an average about 1 ha of dense forest area will be cleared for meeting fuel wood requirements, if no alternate sources of fuel are provided. It should be mandatory for the contractor involved in construction activities to provide alternate source of fuel or run community kitchens, which are Kerosene or LPG as fuel. b) Operation Phase

Acquisition of forest land

About 9.09 ha of forest area under reservoir submergence is to be acquired. In addition land will also be required for siting of construction equipment, storage of construction material, muck disposal, widening of existing roads and construction of new project roads. A part of it could be forest land, for which adequate management measures in the form of compensatory afforestation need to be implemented.

It is recommended that a detailed ecological survey be conducted as a part of EIA study to assess the density and diversity of flora in the area. Species requiring conservation need to be identified and if required, the conservation plan for the same be prepared.

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9.3.5 Impacts on terrestrial fauna

a) Construction phase

The forest area, in the project area and its surroundings provides habitat to various faunal species, quite a few which are categorised as Schedule-I as per the Wildlife Protection Act (1972). The Wildlife Protection Act clearly makes its mandatory to protect such species. It is recommended that, as a part of the EIA study, detailed data collection from various secondary sources needs to be done to assess the severity of impacts due to various project related activities in the construction and operation phases.

b) Operation phase

During project operation phase, accessibility to the area will improve due to construction of roads, which in turn may increase human interference leading to marginal adverse impacts on the terrestrial ecosystem. Since significant increase in human population is not anticipated during project operation phase, the adverse impacts of such interference is likely to be marginal.

Perusal of various faunal species observed in the project area, indicates that there are no migratory faunal species observed in the area. River Goriganga in the project area, even in the pre-project phase, acts as a barrier to wildlife movement. Thus construction of the reservoir as a part of the proposed project, is not expected to cause any additional barrier to wildlife movement in the project area.

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9.3.6 Impacts on aquatic ecology

a) Construction phase During construction of a river valley project, huge quantity of muck is generated at various construction sites, which if not properly disposed, invariably would flow down the river during heavy precipitation. Such condition can lead to adverse impacts on the development of aquatic life, which needs to be avoided.

The increased labour population during construction phase, could lead to increased pressure on fish fauna, as a result of indiscriminate fishing by them. Adequate protection measures at sensitive locations, identified on the basis of fisheries survey in the EIA study need to be implemented.

b) Operation phase

Amongst the aquatic animals, it is the fish life which would be most affected. The migratory fish species, e.g. snow trout and Mahaseer are likely to be adversely affected due to obstruction to their migratory route created by the proposed barrage. The dispersal and migration pattern of various fish species need to be ascertained to assess the degree of severity of impacts, which needs to be done as a part of EIA study.

9.3.7 Impacts on Noise Environment

Increased noise levels are anticipated only during construction phase due to operation of various equipment, increased vehicular traffic and blasting etc. No human settlements are located close to the project site. However

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increased noise level, especially blasting could scare away wildlife from the area. It has been observed during construction phase of similar projects, that wildlife migrates from such areas and returns after the cessation of construction activities. Similar phenomenon is expected in the proposed project site as well. However, presence of Schedule-I species in the project area, makes its imperative to conduct detailed noise modelling studies as a part of EIA study. Based on the increased noise levels, as estimated through modelling studies, impacts on each faunal species observed in areas adjacent to the project site needs to be assessed.

9.3.8 Air Pollution

Pollution due to fuel combustion in various equipment

Normally, diesel is used in construction equipment. The major pollutant which

gets emitted as a result of diesel combustion is SO2. The SPM emissions are minimal due to low ash content in diesel. Model studies conducted for various projects with similar level of fuel consumption indicate that the short-term

increase in SO 2, even assuming that all the equipment are operating at a common point, is quite low, i.e. of the order of less than 1 µg/m 3. Hence, no major impact is anticipated on this account.

Emissions from various crushers

The operation of the crusher during the construction phase is likely to generate fugitive emissions, which can move even up to 1 km along the predominant wind direction. During construction phase, one crusher each is likely to be commissioned at the diversion structure and the power house sites. During crushing operations, fugitive emissions comprising of the suspended particulate will be generated. Since, there are no major

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settlements close to the diversion structure site, hence, significant adverse impacts on this account are not anticipated. However, it is recommended that the labour camp be situated at least 1 km away from the construction sites and that too on the leeward side of the pre-dominant wind direction in the area.

9.3.9 Impacts on socio-economic environment

a) Project construction phase

The construction phase will last for about 4-5 years. Those who would migrate to this area are likely to come from various parts of the country mainly having different cultural, ethnic and social backgrounds. Due to longer residence of this population in one place, a new culture, having a distinct socio-economic similarity would develop which will have its own entity.

Job opportunities will improve significantly in this area. At present most of the population sustains by cultivation and allied activities. The project will open a large number of jobs to the local population.

b) Project operation phase

Based on the information collected as a part of IEE study, it can be said no private land is likely to be acquired in reservoir submergence. In addition, about 50-55 ha of land also needs to be acquired for various project appurtenances. However, as a part of EIA study, data on ownership status of land to be acquired for various project appurtenances, needs to be collected to ascertain total loss of private land and other properties for the proposed project. Based on the

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findings of the survey, suitable Resettlement & Rehabilitation Plan can be prepared. The commissioning of a hydro-electric provides significant impetus to economic development in the area. Likewise, in the project area, commissioning of a hydro-electric project would lead to mushrooming of various allied activities, providing employment to locals in the area.

9.4 SUMMARY OF IMPACTS AND EMP

A summary of impacts and recommended management measures are summarized in Table-9.5.

Table-9.5 Summary of Impacts and suggested management measures S. Parameters Impact Management Measures No. 1. Land Environment Construction • Soil erosion due to • Proper treatment of phase the extraction of quarry site and construction location of new material from quarries over non- various quarry sites. forest land • Temporary • Minimum acquisition of land acquisition of forest for siting of land. construction equipment & material, waste material, etc. • Generation of muck • Disposal at due to tunnelling designated sites operations & roads. and provision of suitable management measures including bio-engineering treatment measures

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Operation • Acquisition of 9.09 • Compensatory phase ha forest land and afforestation 1.79 ha of grasslands.

2. Water resources Operation • River stretch from • In case phase dam site to tail race downstream outfall will have nallahs do not reduced flow during contribute lean lean season. flows minimum flow will be released to maintain the • Moderation of riverine ecology. hydrologic - Regime.

3. Water qual ity Construction • Water pollution due • Provision of phase to disposal of community toilets sewage from labour and septic tanks colonies. Operation • Deterioration of • No significant phase water quality in the impact is dry stretch of river anticipated due to reduced flow during the lean season. • Disposal of sewage • Provision of adequate from project colony. sewage treatment facilities • Eutrophication • Eutrophication risks problems. are minimal, hence, specific management measures are not required. 4. Terrestrial flora Construction • Cutting of trees for • Provision of phase meeting fuel wood community kitchen requirements by by the contractors labour. engaged in project construction.

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

Operation • Acquisition of 9.09 • Compensatory phase ha forest land and afforestation as per 1.79 ha of the Indian Forest grasslands Conservation Act (1980) 5. Terrestrial fauna Construction • Disturbance to - phase wildlife due to operation of various construction equipment.

Operation • Disturbance to • Increased phase wildlife due to surveillance, in the increased form of check posts accessibility in the at major area. construction sites and labour camps.

6. Aquatic Ecology Construction • Increase in water • Marginal impact, phase turbidity hence no specific management measures are Operation • Drying of river suggested. phase stretch downstream of dam up to tail • Provision of release of race outfall minimum flow , In case downstream nallahs do not contribute lean flows. 7. Noise Envir onment Construction • Increase in noise • Marginal impact, phase levels due to hence no operation of various management construction measures are equipment. suggested.

8. Air Environment Construction • Increase in air • Cyclones will be phase pollution due to use provided in of machinery and crushers located at other civil activities. various sites.

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

9. Socio -economic Environment Construction • Increase in - phase employment potential. • Compensation as • Acquisition of per Rehabilitation Operation private land, if any. plan & Area phase Development Activities

• Increased power - generation

• Greater employment - opportunities.

9.5 CONCLUSIONS AND RECOMMENDATIONS

The project lies in the high altitude area and major portion of the catchment is snowbound. Some species of medicinal importance are observed in the study area, mainly at hill top, near the project site. Likewise few faunal species categorised as schedule-I, as per the Wild Protection Act (1972) are also observed in the project as well as the study area. The following aspects need to be studied in detail as a part of next phase of environmental studies:

- Impacts due to acquisition of forest land - Impacts on wildlife, especially species categorized as Schedule-I species as per Wildlife Protection Act (1972). - Proper stabilization of quarry and muck disposal sites - Management of pollution sources from labour camps

9-23 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

CHAPTER - X

INFRASTRUCTURE FACILITIES

10.1 GENERAL

The Sirkari Bhyol Rupsiabagar hydroelectric project across the river Goriganga envisages construction of a dam about 103m high from the deepest foundation, a 800 m long HRT, an underground desilting basin, penstocks and an underground power house with an installed capacity of 210 M.W. (3x70 MW) and a tail race tunnel. The dam site is located about 1.8 km upstream of confluence of Ralamgad which itself is about 28 km (north) from Munsiyari. The power house is about 2 km downstream of dam site. The major infrastructure facilities needed are described in the following paragraphs.

10.2 COMMUNICATIONS

10.2.1 The nearest rail head available to the project is Tanakpur (M.G.) which is about 340 km from the dam site.

From Tanakpur up to Jauljibi site via Champawat and Pithoragarh a wide black topped road exists. From there upto Munsiyari, a kuchha motarable road exists. From Munsiyari to dam site, the existing facility consists of a kuchha road and trekking routes. Munsiyari can also be approached by the existing pucca road from Almora upto Kulti via Bageshawar and from Kulti on a motarable road, which often gets blocked during monsoons.

10-1 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

10.2.2 Roads in the Project Area

For project construction the road from Kulti upto Munsiyari is required to be vastly improved and also fresh roads needs to be built, by improving the existing kuchha road / tracks from Munsiyari to dam site. For the approach from Jauljibi to Munsiyari the existing motorable road needs improvement, widening at places and strengthening of existing bridges / culverts.

Construction roads are also required from dam / power house site to quarry sites, and plant and machinery workshops etc.

A temporary bridge across the river downstream of the dam axis will also be needed for use during construction.

Considering the existing road facilities, lengths of new roads to be constructed will be about 40 km.

10.2.3 Railways

The nearest railway stations are Tanakpur (Metre Gauge) and Kathgodam on the Broad Gauge line. Railway siding for unloading heavy machineries and equipment is to be provided at the station selected.

10.3 CONSTRUCTION POWER

The power demand for the construction activities is estimated to be about 4 M.W. taking into consideration capacity of lighting and electric driven equipment which are to work within the target time.

The power requirement can be met with by procuring the supply from Uttaranchal state electricity authorities. For making the power available at project site 33/11 K.V. substation alongwith new power lines will be required.

10-2 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

In addition to tapping grid supply, it is also proposed to provide supplemental power aggregating to 1 M.W. from diesel generating sets, as a stand by in cases of interruptions in grid supply.

10.4 TELECOMMUNICATION

To ensure efficient execution at various sites, adequate and reliable telecommunication network is necessary. An electronic automatic exchange with a capacity of about 40 lines is proposed. A VHF system is also proposed to link project Head Quarters with clients head-quarters.

Suitable number of mobile phones / walky talkies are also proposed.

10.5 PROJECT COLONIES / BUILDINGS

Two project colonies are proposed, one near dam site and another near Power House site. Facilities such as post office, police station, market, primary health centre, fire fighting arrangement, canteen and recreation facility are also needed. Administrative building, guest house, family quarters and a field hostel will be needed.

10.6 CONTRACTOR’S COLONY AND LABOUR COLONY

Contractor’s colonies and two labour colonies with all amenities are to be located at sites near both the dam and power house.

10.7 WORKSHOPS, STORES, FABRICATION YARDS AND MAGAZINES

Workshops for maintaining plant and equipment used for construction, stores for construction materials, hydro-mechanical and electro-mechanical equipments etc. will be built and maintained by the contractor. However, a

10-3 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

small workshop is planned for repair and maintenance facilities of project transport vehicles and minimum essential equipment which are bought by the client.

Areas for fabrication yards for the hydro – mechanical equipment, viz the various gates and hoists, penstocks etc. will have to be located near the work sites.

Two explosive magazines for the underground works and rock quarries works are also to be built.

10.8 WATER SUPPLY AND SANITATION

For drinking purposes in the colony areas, suitable water treatment plants for treating water drawn from the river Goriganga will be used. For construction purposes, water directly pumped from the river and stored will be used.

Suitable sanitation and sewerage treatment facilities will have to be made at all the project and labour colony areas.

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PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

CHAPTER-XI

CONSTRUCTION PROGRAMME AND SCHEDULE

11.1 GENERAL

Sirkari Bhyol Rupsiabagar hydro-electric project including erection, testing and commissioning of three generating units of 70 M.W. each can be completed in five years nine months including one year of pre-construction and infrastructure activities. The testing and commissioning of first unit can be done at the end of March of 6 th year and the next two units further at three months intervals.

The working season for over-ground works is considered as 8 months starting from October in a year to May in the subsequent year. However depending upon the onset and withdrawal of monsoons, some more weeks of working season for open works may be available. During winter months of December to February, there could be some interruptions in work due to snow fall and biting cold conditions. The underground works can proceed during the entire year, though during the monsoon months and snowy days the progress will be retarded.

11.2 MAIN COMPONENTS OF THE PROJECT

The construction schedule has been detailed by considering the following major items of the project:

(i) Civil Works

(a) Infrastructure (b) Care of river during construction

11-1

PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

(c) Main dam (d) Intake and desilting basin (e) Head race tunnel (f) Penstocks / pressure shaft (g) Under ground power house including switch yard etc. (h) Tail race works (2) Electrical Works

(a) E.O.T. crane (b) Supply and erection of T.G. sets (c) Switch yard and transformers (d) Other auxiliary equipment

(3) Hydro mechanical works

(a) Main dam gates and stoplogs (b) Intake gates (c) Gates for desilting basin (d) Draft tube gates

The details of the works are given in the salient features of the project

11.3 CONSTRUCTION SCHEDULE

The total construction period can be scheduled as follows:

Total construction period including one year of infrastructure and pre-construction 5 years 9 activities months

Commissioning of Unit one --- March of 6 th year

11-2

PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

Commissioning of Unit two --- June of 6 th year Commissioning of Unit three --- September of 6 th year

The programme in the form of a bar chart is attached.

11.4 INFRASTRUCTURE FACILITIES

The creation of infrastructure facilities can be taken up in the beginning of first year. Construction of project roads, construction roads to quarry sites, tunnel portals etc can be completed during the year. The construction of office, residential buildings and other buildings can also be started in the first year and phased over to second year as per requirement. The facilities like workshops, fabrication yards, stores, magazine etc. which will also be started in the first year and will be completed as per the needs of actual works.

11.5 MAIN DAM

For care of river during construction, a diversion tunnel on the right bank of river and semi permanent coffer dams of small heights are considered. The excavation of the diversion tunnel will be started in the first year and with working from both the upstream and downstream ends, the diversion tunnel can completed in nine months. The upstream and downstream (if needed) coffer dams, which will be of semi permanent type with colcrete / plum concrete will be completed in the last quarter of the first year to facilitate diversion by the beginning of 2 nd year. During the second and subsequent diversions the coffer dams may require only minor repairs / restoration.

The excavation for the dam at the abutments will be taken up in the first year itself after the rainy season and all the excavation including river bed portion after river diversion can be completed before the end of second year.

11-3

PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

The work of foundation treatment will start as the excavation of foundation progresses and the all the consolidation work can be completed before June of third year. The curtain grouting and drainage holes work will be done through the foundation grouting provided in the dam after the dam blocks have reached about 8-10 m above the gallery and completed before reservoir filling.

The concreting for the main dam NOF and spillway blocks including ski jump bucket will be started in the last quarter of 2 nd year and completed in all respects by the end of 5 th year. The erection of spillway gates and stop log will also be competed by this time.

11.6 INTAKE AND DESILTING BASIN

The work of intake will be taken up from the beginning of second year and completed in all respects by the March of third year.

The works of desilting basin can be started from the beginning of third year and completed by June of fourth year.

11.7 HEAD RACE TUNNEL, SURGE SHAFT, PENSTOCK AND TAIL RACE

The length of the H.R.T. is only about 800 m and the work can be started from dam side after creating an approach from October of second year and can also excavated from surge shaft end after this face is available. All the works of HRT including tunnel excavation, concreting and grouting will be completed by the end fourth year as shown in the bar chart.

The pressure shaft / penstock will be taken up by March of second year. The entire work of pressure shaft/penstock can be completed by the end of fourth

11-4

PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

year as shown in the construction schedule bar chart. The works of tail race can be easily done in 9 months and completed by the middle of 4 th year.

11.8 POWER HOUSE

The power house is planned as an under ground power house on the right bank hill of the river. The excavation for the power house can be started from October of first year and all the works including sub-structure and super structure can be completed along with the installation of electro-mechanical equipment of the three units by the end of fifth year as shown in the bar chart.

11.9 TESTING AND COMMISSIONING

The first unit can be commissioned after testing by the end of March of sixth year, the second unit by June of sixth year and the third unit by October of sixth year.

11-5 Construction Schedule Sirkari Bhyol Rupsiabagar Hydro Electric Project

Sl. Time of work DPR Construction

I Year II Year III Year IV Year V Year VI Year I II I II III IV V VI

No. Quarter I II III IV I II I II III IV I II III IV I II III IV I II III IV I II III IV I II III IV

A PREPARATION OF DPR AND APPROVALS I PRECONSTRUCTION ACTIVITIES a Approach road & infrastructure works b Tenders and contracts finalisation c Model tests d Engineering designs and drawings e Construction power f Land acquisition II DIVERSION ARRANGEMENTS a Diversion tunnel b Coffer dams III MAIN DAM a Excavation Consolidation Curtain b Foundation treatment c Concreting IV INTAKE a Excavation & rock support system b Concreting V DESILTING BASINS a Excavation & rock support system b Concrete lining etc. VI HEAD RACE TUNNEL a Excavtion & rock support system b Concrete lining and grouting Construction Schedule Sirkari Bhyol Rupsiabagar Hydro Electric Project

Sl. Time of work DPR Construction

I Year II Year III Year IV Year V Year VI Year I II I II III IV V VI

No. Quarter I II III IV I II I II III IV I II III IV I II III IV I II III IV I II III IV I II III IV VII PENSTOCKS a Excavation b Concrete c Fabrication and erection VIII POWER HOUSE a CIVIL WORKS - Excavation - Substructure concrete - Superstructure concrete b ELECTRICAL WORKS - Procurement of Electro-mechanical equipment - Erection of E.O.T. crane - Erection of turbines, generators etc. IX TAIL RACE WORKS a Excavation b Concrete X HYDRO MECHANICAL WORKS a Spillway gates b Spillway stoplog c Intake gates d Gates for desilting basin e Surge shaft/tail race gates

XI TESTING AND COMMISIONING 1 Unit

Unit I 2 Unit

Unit II 3 Unit Unit III

NOTES : 1. The year is taken as calendar year and the quarters I-January to March, II-April to June, Fabrication III-July to September and IV-October to December Legend 2. The quarter July to September is of rainy season and the open works shall mostly stop. (for HM & E&M works) Erection PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

CHAPTER-XII

COST ESTIMATE

12.1 INTRODUCTION

The Sirkari Bhyol Rupsiabagar hydroelectric project envisages construction of a 103 m high concrete dam above the deepest foundation level about 1.8 km upstream of confluence of Ralamgad with Goriganga. The underground power house is located on the right bank hill of the river about 1 km upstream of confluence of Piltigad. The major works of the project include intakes, an underground desilting basin, a 800 km long HRT, penstocks and tail race works. The salient features of the project are given in the report. The power house will have an installed capacity 210 MW (3x70 MW).

12.2 The Project is estimated to cost Rs.753 crore at June 2003 price level. The break down of cost is given below :

Item Estimated Cost ( Rs. Crores ) Civil Works 561.01 Electrical Works 191.55 Sub Total (Generation) 752.56 Say 753.00

The project estimate has been prepared on the basis of “ Guidelines for preparation of cost estimates for River Valley projects” published by Central Water Commission, New Delhi. The abstract of cost is enclosed as Annexure 12.1. The above cost does not include the cost of transmission.

The estimate for civil & Hydro mechanical works have been prepared based on the as average rates for major items of works made available by CWC in the “guidelines for estimating the civil cost for the preparation of PFR”.

12-1 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

The electro mechanical rates have been adopted on the basis of enquiry floated to various reputed manufactures / supplier. The rates are inclusive of excise duty & taxes.

The phased programme of construction has been given in the relevant chapter with this report.

Cost provisions for the various items mentioned below has been made on lump sum percentage basis of C-Works & J – Power Plant Civil Works for working out the total cost of project at pre - feasibility stage.

S.No. Items Provisions of % of C- Works & J - Po wer Plant Civil Works 1 A. Preliminary 2% 2 K. Buildings 4% 3 O. Miscellaneous 4% 4 R. Communication 4% 5 X. Environment & Ecology 2% 6 P. Maintenance 1% of total of C-Works J-Power Plant Civil Works K-Buildings R-Communications 7 Y. Losses on Stock 0.25% of total of C – Works, J - Power Plant - Civil Works, K - Building & R - Communication

12-2 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

12.3 ELECTRO-MECHANICAL WORKS

12.3.1 The details of the estimates for Electro-Mechanical works have been estimated as Rs. 191.55 Crores. Various details of different components are given in Annex. 12.2.

12.3.2 Power of this project is intended to be evacuated by a 8 km long, 220 Kv D/C line to Rupsiabagar – Khasiyabara H.E. Project. The cost of this line is estimated as Rs. 6.0 crores.

12-3 Annexure 12.1

SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT ABSTRACT OF COST OF WORKS AMOUNT S.No. DESCRIPTION (Rs.in Crores) (June 2003)

A CIVIL WORKS

1 DIRECT CHARGES

I - Works

A - Preliminary 8.60 B - Land 1.80 C - Works 276.50 J - Power Plant Civil Works 151.20 K - Buildings 17.20 M - Plantation 2.00 O - Miscellaneous 17.20 P - Maintenance 4.62 Q - Special Tools & Plants 10.00 R - Communication 17.20 X - Environment & Ecology 8.60 Y - Losses on Stock (-) 1.16

TOTAL OF I - WORKS 513.76

II - Establishhment @ 8% of cost of I-works less B-Land 40.96 III - Tools and Plants @ 1% of cost of I - Works 40.96 IV- suspense 5.14 V - Receipt & Recoveries (-) 4.08

Total Direct Charges 555.78 2 Indirect charges a) Capital value of Abatement of land Revenue 0.09 b) Audit and Account Charges @ 1% of cost of I-Works. 5.14

Total indirect Charges 5.23

Total of Direct & Indirect Charges. 561.01

Abstract : A Civil Works 561.01 B Electrical works 191.55 Total cost 752.56

Say 753.00 462.10 1.15525

0.015

0.09 J - Power Plant Civil Work - 7 SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT COST ESTIMATE - HYDRO - MECHANICAL WORKS

S.No. Item Unit Oty Rate Amount

1 DIVERSION TUNNEL Gate MT 85 100000 85.00 Embedded Parts MT 25 50,000 12.50 Rope Drum Hoist (as per capacity) Set 1 8000000 80.00

2 SPILLWAY STRUCTURE a Radial Gates MT 800 100000 800.00 Embedded Parts (Including anchorages) MT 250 60,000 150.00 Hydraulic hoist Set 2 40000000 800.00 b Bulkhead Gates MT 350 60000 210.00 Embedded Parts MT 100 50,000 50.00 Gantry Crane Set 1 10000000 100.00

3 INTAKE STRUCTURE a Intake Gate MT 35 100000 35.00 Embedded Parts for Intake Gate MT 10 50,000 5.00 Rope drum hoist (as per capacity) Set 2 2000000 40.00 b Bulkhead Gates MT 20 60,000 12.00 Embedded Parts for Bulkhead Gates MT 8 50,000 4.00 Gantry Crane (as per capacity) Set 1 1000000 10.00 c Trash Racks and Embedded Parts MT 88 50000 44.00

4 DESILTING CHANNEL a Gate MT 45 100000 45.00 b Embedded parts MT 15 50000 7.50 c Hoist/Hydraulic Set 2 2000000 40.00

2530.00 Say 2550.00 J-Power Plant Civil Works-1 SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT COST ESTIMATE - INTAKE STRUCTURE

Sl.No. Item of work Unit Qty Rate (Rs.) Amount (Rs. in Lakh)

1 Surface Excavation 1.1 Common excavation M3 4800 125 6.00 1.2 Rock excavation M3 19000 300 57.00

2 Underground Excavation M3 350 1000 3.50

3 Support System

3.1 Rockbolts RM 500 400 2.00 3.2 Shotcreting M3 120 4000 4.80

4 Concrete

4.1 M-15 M3 14000 2930 410.20 4.2 M20 M3 20000 3392 678.4 4.3 Concrete lining M-20 M3 150 4000 6.00

5 Reinforcing Steel MT 2500 27000 675.00 Sub-total (A) 1842.90 6 Miscellaneous and Ancillary Works 6.1 Various miscellaneous works like drilling & grouting, wiremesh reinforcement, slope protection works, othr steel works etc. 36.86 Sub-total (B) 1879.76 7 Instrumentation 2% of sub-total B 37.60 8 Dewatering 1% of sub-total B 18.80 9 Contingencies 3% of sub-total B 56.39 10 Workcharged establishment 2% of sub-total B 37.60 Total 2030.14 Say 2030.00 J-Power Plant Civil Works-2 SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT COST ESTIMATE DESILTING CHAMBER & SILT FLUSHING TUNNEL

Sl.No. Item of work Unit Qty Rate (Rs.) Amount (Rs. in Lakh)

1 Surface Excavation 1.1 Common excavation LS 5.00 1.2 Rock excavation LS 10.00

2 Underground Excavation M3 140000 1000 1400.00

3 Support System

3.1 Rockbolts RM 40000 400 160.00 3.2 Shotcreting M3 3000 4000 120.00

4 Concrete Lining

4.1 M-20 M3 19000 4000 760.00

5 Reinforeing Steel

5.1 Steel liner MT 500 70000 350.00 5.2 Steel reinforcement MT 1150 27000 310.50 5.3 Steel plate MT 330 70000 231.00 Sub-total (A) 3346.50 6 Miscellaneous and Ancillary Works

6.1 Various Miscellaneous works like wiremesh/steel fibre reinforcement, drilling & grouting etc. 4% 133.86 Sub-total (B) 3480.36 7 Instrumentation 1% of sub-total B 34.80 8 Dewatering 2% of sub-total B 69.60 9 Contingencies 3% of sub-total B 104.40 10 Workcharged establishment 2% of sub-total B 69.6 Total 3758.76 Say3760.00 J-Power Plant Civil Works-3 SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT COST ESTIMATE - HEAD RACE TUNNEL + INTAKE TUNNELS

Sl.No. Item of work Unit Qty Rate (Rs.) Amount (Rs. in Lakh)

1 Surface Excavation 1.1 Common excavation LS 5.00 1.2 Rock excavation LS 5.00

2 Underground Excavation M3 24000 1000 240.00

3 Support System

3.1 Rockbolts RM 15500 400 62.00 3.2 Shotcreting M3 700 4000 28.00 3.3 Steel support LS 15.00 3.4 Concrete lagging LS 5.00 3.5 Drilling & grouting RM 1600 1300 20.80

4 Concrete Lining 4.1 Cement Concrete Lining M-20 M3 5000 4000 200.00

5 Reinforcing Steel MT 50 27000 13.50 Sub-total (A) 594.30 6 Miscellaneous and Ancillary Works

6.1 Various Miscellaneous works like wiremesh/steel fibre reinforcement, drilling & grouting, PVC pipes for drainage, slope prolection works etc. 8% 47.54 Sub-total (B) 641.84 7 Instrumentation 1% of sub-total B 6.42 8 Dewatering 2% of sub-total B 12.84 9 Contingencies 3% of sub-total B 19.26 10 Workcharged establishment 2% of sub-total B 12.84 Total 693.19 Say 700.00 J-Power Plant Civil Works-4 SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT COST ESTIMATE - PRESSURE SHAFTS AND ACCESS TUNNEL

Sl.No. Item of work Unit Qty Rate (Rs.) Amount (Rs. in Lakh)

1 Surface Excavation 1.1 Common excavation LS 5.00 1.2 Rock excavation LS 5.00

2 Underground Excavation M3 56000 1000 560.00

3 Support System

3.1 Rockbolts RM 33000 400 132.00 3.2 Shortcreting M3 1000 4000 40.00

4 Concrete

4.1 M-20 concrete lining M3 11000 4000 440.00

5 Steel

5.1 Steel liners MT 2000 70000 1400.00 5.2 Steel Reinforcement MT 110 27000 29.70 Sub-total (A) 2611.70 6 Miscellaneous and Ancillary Works

6.1 Various Miscellaneous works like drilling & & grouting, wiremesh/steel fibre reinforcement, swellex anchor, etc. 3% 78.35 Sub-total (B) 2690.05 7 Instrumentation 1% of sub-total B 26.90 8 Dewatering 1% of sub-total B 26.90 9 Contingencies 3% of sub-total B 80.70 10 Workcharged establishment 2% of sub-total B 53.80 Total 2878.35 Say 2880.00 J-Power Plant Civil Works-5 SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT COST ESTIMATE - POWER HOUSE COMPLEX INCLUDING TRANFORMER CAVERN

Sl.No. Item of work Unit Qty Rate (Rs.) Amount (Rs. in Lakh)

1 Surface Excavation Rock excavation M3 5000 300 15.00

2 Underground Excavation M3 100000 1000 1000.00

3 Support System 3.1 Rockbolts / Rock anchors RM 11000 400 44.00 3.2 Shortcreting M3 1000 4000 40.00

4 Concrete

4.1 M20 M3 10000 3392 339.20 4.2 M15 M3 14500 2930 424.85

5 Reinforcing Steel MT 2600 27000 702.00

6 Structural Steel for roof trusses MT 40 42000 16.80

7 Stone/Brick Masonry LS 20.00 Sub-total (A) 2601.85 8 Miscellaneous 8.1 Various miscellaneous works like site clearance, drilling & grouting, wiremesh/steel fibre, reinforcement, flooring, water proofing system swellex anchor, doors & windows,painting, lift arrangement, architectural works, other metalworks etc. 5% 130.09 Sub-total (B) 2731.94 9 Instrumentation 1% of sub-total B 27.32 10 Dewatering 2% of sub-total B 54.64 11 Contingencies 3% of sub-total B 81.96 12 Workcharged establishment 2% of sub-total B 54.64 Total 2950.50 Say 2950.00 J-Power Plant Civil Works-6 SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT COST ESTIMATE - TAIL RACE TUNNEL

Sl.No. Item of work Unit Qty Rate (Rs.) Amount (Rs. in Lakh)

1 Surface Excavation Rock Excavation M3 500 300 1.50

2 M3 10500 1000 105.00

3 Support System 3.1 Rockbolting RM 6000 400 24.00 3.2 Shotcreting M3 400 4000 16.00

4 Concrete Lining-M-20 M3 2000 4000 80.00 Sub-total (A) 226.50 5 Miscellaneous 5.1 Misc. 3% 6.80 Sub-total (B) 233.30 6 Dewatering 2% of sub-total B 2.33 7 Contingencies 3% of sub-total B 7.00 8 Workcharged establishment 2% of sub-total B 4.67 247.30 Say 250.00 SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT COST ESTIMATE A - PRELIMINARY

Sl.No. Item of work Unit Qty Rate (Rs.) Amount (Rs. in Lakh)

1 Cost of surveys and investigation including geological investigation, hydrological investigation, preliminary construction materials surveys, C/O access paths and roads etc. at PFR stage.

2 Topographical & other surveys for dam, powerhouse, reservoir etc.

3 Geological Investigation

4 Drilling & Drifting

5 Construction Material Survey

6 Hydrological and meteorological observation L.S. 2% OF C & J WORKS 855.40

7 Geophysical survey, seismological study.

8 Hydraulic model studies

9 Ground water studies

10 Charges for preliminary consultancy & specialists

11 Training of Engineers during investigation

12 Instrument and equipment for S & I works

13 Stationary. Writing of completion report & history of project.

855.40 Say 860.00 SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT COST ESTIMATE - B - LAND

Sl.No. Item of work Unit Qty Rate (Rs.) Amount (Rs. in Lakh)

1 Requirement of land ha 350 50,000 175.00

2 Staff for demarcation and measurement of of land @ 1% of value of land LS 1.75

Total 176.75 Say 180.00 SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT COST ESTIMATE - K - BUILDINGS

Sl.No. Item of work Unit Qty Rate (Rs.) Amount (Rs. in Lakh)

1 Residential Buildings

1.1 Permanent residential buildings including Service Charges

1.2 Temporary buildings including Service Charges

Total Residential Buildings L.S. 4 % OF C & J Work 1710.80 2 Non Residential Buildings

2.1 Permanent non-residential buildings including Service Charges

2.2. Temporary buildings including Service Charges

Total Non-residential Buildings

Grant Total ( Residential + Non-Residential) 1710.80 Say 1720.00 SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT COST ESTIMATE - Q - SPECIAL T&P

Sl.No. Item of work Unit Qty Rate Amount (Rs. (Rs.in in Lakh) lakh)

1 Inspection and Transport Vehicles

Staff Car no 4 3.75 15.00 Gypsy / Jeep no 12 3.75 45.00 Ambulance no 2 8 16.00 School / Staff Bus no 2 6.5 13.00 Mini Truck no 4 5 20.00 Truck 10 ton no 5 8 40.00

2 Miscellaneous Equipments

Crane 50 ton no 2 155 310.00 Crane 18 ton no 2 75 150.00 Crane 10 ton no 2 45 90.00 DG sets 500 KVA no 4 25 100.00 Welding set no 4 2.25 9.00 Tractor Trailor no 2 18 36.00 Weight Bridge-20 ton no 2 8 16.00 Explosive Van 10 ton no 2 6 12.00 Pump 5 HP no 20 0.2 4.00 Pump 10 HP no 10 0.3 3.00 Pump 50 HP no 10 1 10.00

3 Workshop Equipments

Lathe machine no 2 4 8.00 Shaper machine no 2 1 2.00 Bench Drilling machine no 2 0.7 1.40 Grinder no 4 0.15 0.60 Drill Steel Grinder no 2 0.75 1.50 Power hacksaw no 6 0.25 1.50 Hydrulic jack no 2 0.5 1.00 Engine repair shop no 2 0.15 0.30 Auto-electrical repair shop no 2 1.25 2.50 Battery charger LS 2.00 Compressor for tyre inflation LS 2.00 Gas cutting set LS 6.00 Unforeseen item LS 15.00 Total cost of special tools and plants 932.80 Say 1000.00

NOTE : The project has been planned for construction through private agencies. The contractor shall arrange heavy equipments for works for which no provision has been kept under Q - Special T&P. C-Works-3 SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT COST ESTIMATE - CONCRETE DAM

Sl.No. Item of work Unit Qty Rate (Rs.) Amount (Rs. in Lakh)

1 Surface Excavation

1.1 Common Excavation M3 395000 125 493.75

2 Support System

2.1 Rockbolts RM 24000 400 96.00 2.2 Shotcreting M3 3250 4000 130.00

3 Concrete

3.1 M 15 M3 675000 2930 19777.50 3.2 M 20 M3 60000 3392 2035.20 3.3 Drilling RM 3000 500 15.00 3.4 Drilling & Grouting RM 8000 1300 104.00

4 Reinforcing Steel MT 4800 27000 1296.00 Sub-total (A) 23947.45 5 Miscellaneous

5.1 Various miscellaneous works like wiremesh/steel fibre reinforcement,drilling & grouting PVC pipes, other steel works, slope protection works, elevator, road works, architectural works for dam etc. 3% 718.42 Sub-total (B) 24665.87 6 Instrumentation 1% of sub-total B 246.66 7 Dewatering 2% of sub-total B 493.32 8 Contingencies 3% of sub-total B 739.98 9 Workcharged establishment 2% of sub-total B 493.32 Total 26639.14 Say 26700.00 C - Works - 1 SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT COST ESTIMATE - DIVERSION TUNNEL

Sl.No. Item of work Unit Qty Rate (Rs.) Amount (Rs. in Lakh)

1 Surface Excavation 1.1 Common excavation M3 8000 125 10.00 1.2 Rock excavation M3 800 300 2.40

2 Underground Excavation M3 31000 1000 310.00

3 Support System 3.1 Rockbolts RM 12600 400 50.40 3.3 Shotcreting M3 800 4000 32.00

4 Concrete 4.1 Cement concrete lining M-20 M3 5500 3392 186.56 4.2 M-20 cone in portals etc. 200 3392 6.78

5 Reinforcing Steel MT 20 27000 5.40 Sub-total (A) 603.54 6 Miscellaneous and Ancillary Works 6.1 Various Miscellaneous works like wiremesh/steel fibre reinforcement, drilling & grouting, PVC pipes for drainage, slope protection works etc. 8% 48.28 Sub-total (B) 651.82 7 Instrumentation 1% of sub-total B 6.52 8 Dewatering 2% of sub-total B 13.04 9 Contingencies 3% of sub-total B 19.55 10 Workcharged establishment 2% of sub-total B 13.04 Total 703.97 Say 710.00 C-Works-2 SIRKARI BHYOL RUPSIABAGAR HYDRO ELECTRIC PROJECT COST ESTIMATE - COFFER DAM

Sl.No. Item of work Unit Qty Rate (Rs.) Amount (Rs. in Lakh)

1 Surface Excavation

1.1 Common Excavation M3 500 125 0.63

2 Concrete

2.1 M-15 M3 2000 2930 58.60 2.2 Plum Concrete M3 8000 2000 160.00

3 Rock Anchors RM 500 400 2.00 Sub-total (A) 221.23 4 Miscellaneous

4.1 Various miscellaneous works 0.5% 1.11 Sub-total (B) 222.33 5 Dewatering 3% of sub-total B 6.67 6 Contingencies 3% of sub-total B 6.67 7 Workcharged establishment 2% of sub-total B 4.45 Total 240.12 Say 240.00 Annexure-12.2 SIRKARI-BHYOL RUPSIABAGAR COST ESTIMATE OF ELECTRO-MECHANICAL WORKS FOR PRE - FEASIBILTY REPORT

Sl.NO. ITEM Qty. Unit Rate Unit Amount (In Total Amount Rs. Lakhs) (In Rs. Lakhs) Excise Duty

Rate Amount (In Rs. Lakhs) 1 2 3 4 5 6 7 8 9 10

1 Generating Unit and Bus Duct 70 MW, 500 RPM, 388.97 m 3 Nos. 0.042 Rs./kW 8820 16% 1411.2 10231.20 Head 2 Step up transformer 11/220/ √ 3 kV,28 MVA, Single Phase 10 Nos. 250 Rs./kVA 700 16% 112 812.00 3 Auxiliaries Electrical Equipment for power Stations ( 441 16% 70.56 511.56 5% of item 1) 4 Auxiliary Equipment and services for power stations (5% 441 16% 70.56 511.56 of item 1) 5 Switchyard-GIS -220 kV 7 bays 300 Rs. Lakhs/bay 2100 16% 336 2436.00 6 Spares( 5% of 1 and 3% of 2-5) 551.46 551.46 7 Sub- total(1) 13053.46 2000.32 15053.78 8 Central Sales Tax @ 4% of item 7 602.15 9 Transportation & Insurance @ 6% of item 7 903.23 10 Erection and Commissioning @ 8% of item 7 1160.19 Except Spares 11 Sub- total(2) 17719.34 12 Establishment, Contingency, other Charges @ 11% of item 7 1435.88 excluding duties GRAND TOTAL 19155.22 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

CHAPTER – XIII

ECONOMIC EVALUATION

13.1 GENERAL

The economic and financial evaluation of the Sirkari Bhyol Rusiabagar H.E project have been carried out considering the standard guidelines issued by Central Electricity Authority and the norms laid down by the Central Electricity Regulatory Commission (CERC) for Hydro projects.

13.2 PROJECT BENEFITS

13.2.1 The scheme would afford on annual energy generation of 967.97 GWh in a 90% dependable year. For assessing the tariff, design energy generation of 937.23 GWh , calculated with 95% capacity availability in a 90% dependable year, has been adopted. The project would provide 210 MW of peaking capacity benefits.

13.3 CAPITAL COST

The project cost has been estimated at Rs. 752.56 Crores without IDC based on the criteria for “Adoption of Rates and Cost for preparation of PFRs of hydro-electric projects” issued by CEA and is as given below:

1. Cost of civil works = Rs. 561.01 Crores 2. Cost of Electrical/Mechanical works = Rs 191.55 Crores

Total = Rs.752.56 Crores

13-1 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

13.4 MODE OF FINANCING

The project is proposed to be financed with a debt equity ratio of 70:30. An interest rate of 10% on the loan component has been considered for the financial analysis of the project. The interest on the working capital is taken as 9.75%.

13.5 PHASING OF EXPENDITURE

The project is proposed to be completed in 5 years and 9 months period in all respect with full benefit available after 5 years and 9 months. The detailed year wise phasing of expenditure based upon the above construction programme for Civil & Electrical works is given in Annexure 13.1.

13.6 FINANCIAL ANALYSIS

13.6.1 Basic And Normative Parameters

The following basic parameters have been adopted for working out the financial analysis of the project.

i) Estimated capital cost of Rs. 893.63 Crores considering the Interest during construction. ii) Annual energy generation of 967.97 GWh in 90% dependable year and Design energy of 937.23 GWh. iii) Operation & maintenance expenses (including insurance) @ 1.5% of the project cost in the first year with 5% escalation every year. iv) Depreciation @ 3.5 % has been considered on an average basis. v) Auxiliary consumption @ 0.7 % of the energy generated. vi) Transformation loss @ 0.5% of the energy generated. vii) Interest on working capital @ 9.75%.

13-2 PFR STUDIES OF SIRKARI BHYOL RUPSIABAGAR HE PROJECT

viii) Interest during construction has been worked out based upon the interest rates as mentioned above. The computations are given in Annexure 13.2 for present day capital cost. ix) Corporate tax @ 30%. x) Return on equity @ 16%.

13.6.2 Assessment of Tariff

Based upon the parameters given above, the sale rate of energy at bus bar has been computed in Annexure 13.3. The sale rate applicable in the first year and levellised tariff is indicated below.

Table – 13.2

Tariff Period Tariff (Rs./KWh)

First Year 1.55

Levellised Tariff 1.25

13.7 CONCLUSION

The sale rate of energy indicated above shows that the energy generated from the project is financially viable and economically attractive.

13-3 Annexure -13.1

SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME (Underground Power House)

Phasing of Expenditure

INR crores

Year Civil cost E & M cost Total cost

1 56.10 19.16 75.26

2 112.20 38.31 150.51

3 140.25 47.89 188.14

4 140.25 47.89 188.14

5 56.10 19.16 75.26

6 56.10 19.16 75.26

Total 561.01 191.55 752.56 Annexure 13.2 SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME (Underground Power House)

Calculation of Interest During Construction

Debt : Equity 70 : 30 Interest rate @ 10 %

(INR crores)

Year Project Equity Loan ITERATION - I GRAND TOTAL cost component component Cummulative IDC Equity for Loan for TOTAL Capitalised (30%) (70%) loan 10.0% IDC IDC IDC IDC cost (Civil & E&M) (6) x 0.30 (6) x 0.70 10.0% 1 2 3 4 5 6 7 8 9 10 11

1 75.26 75.26 0.00 0.00 0.00 0.00 0.00 0.00 0.00 75.26 2 150.51 150.51 0.00 0.00 0.00 0.00 0.00 0.00 0.00 150.51 3 188.14 0.00 188.14 188.14 9.41 2.82 7.53 0.38 9.78 197.92 4 188.14 0.00 188.14 376.28 28.22 8.47 22.58 1.88 30.10 218.24 5 75.26 0.00 75.26 451.54 41.39 12.42 33.11 4.67 46.06 121.31 6 (9months) 75.26 0.00 75.26 526.79 48.92 14.67 39.13 6.21 55.13 130.38

Total 752.56 225.77 526.79 127.94 38.38 102.35 13.13 141.07 893.63 Annexure - 13.3 SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME (Underground Power House) TARIFF CALCULATIONS WITH PROJECTED COMPLETION COST

Debt:Equity Ratio 7.0 : 3.0

Yr 1 Yr 2 Yr 3 Yr 4 Yr 5 Yr 6 Yr 7 Yr 8 Yr 9 Yr 10 Yr 11 Yr 12

BASIC PARAMETERS Capacity (MW) 210.00 210.00 210.00 210.00 210.00 210.00 210.00 210.00 210.00 210.00 210.00 210.00 Capital Cost (INR crores) 752.56 752.56 752.56 752.56 752.56 752.56 752.56 752.56 752.56 752.56 752.56 752.56 Capital Cost with IDC . 893.63 893.63 893.63 893.63 893.63 893.63 893.63 893.63 893.63 893.63 893.63 893.63 Equity Portion (%) 20.00 20.00 20.00 20.00 20.00 20.00 20.00 20.00 20.00 20.00 20.00 20.00 Debt Portion (%) 80.00 80.00 80.00 80.00 80.00 80.00 80.00 80.00 80.00 80.00 80.00 80.00 Capital Cost/MW (INR crores) 4.26 4.26 4.26 4.26 4.26 4.26 4.26 4.26 4.26 4.26 4.26 4.26 Interest rate for WC (%) 9.75 9.75 9.75 9.75 9.75 9.75 9.75 9.75 9.75 9.75 9.75 9.75 Tax rate (%) 30.00 30.00 30.00 30.00 30.00 30.00 30.00 30.00 30.00 30.00 30.00 30.00 Interest rate on loan from Financial Institutions (%) 10.00 10.00 10.00 10.00 10.00 10.00 10.00 10.00 10.00 10.00 10.00 10.00 Total annual energy (GWh) 967.97 967.97 967.97 967.97 967.97 967.97 967.97 967.97 967.97 967.97 967.97 967.97 Design energy with 90% dependibility (GWh) 937.23 937.23 937.23 937.23 937.23 937.23 937.23 937.23 937.23 937.23 937.23 937.23 Saleable Energy after aux. (GWh) 926.02 926.02 926.02 926.02 926.02 926.02 926.02 926.02 926.02 926.02 926.02 926.02 consumption & transformation losses

FINANCIAL PACKAGE (INR crores) LOAN % of % of Intt. AMOUNT EQUITY % of % of AMOUNT Loan Component 714.9 total project Rate (INR total project (INR loan cost (%) crores) equity cost crores) Fin. Institutions 714.90

Equity component 178.73 Fin. Institutions 100.00 70.00 10.00 714.90 Equity 100.00 30.00 268.09 268.09 893.6

Total 100.00 70.00 714.90 Total 100.00 30.00 268.09 Period Repayment Moratorium Installment/yr.

Financial Inst. 10 0 1

Repayment Amount/year Financial Institutions 71.49

Construction Period (Yrs.) 5.75

3/14 Annexure - 13.3 SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME (Underground Power House) TARIFF CALCULATIONS WITH PROJECTED COMPLETION COST

Debt:Equity Ratio 7.0 : 3.0

Yr 1 Yr 2 Yr 3 Yr 4 Yr 5 Yr 6 Yr 7 Yr 8 Yr 9 Yr 10 Yr 11 Yr 12

NORMATIVE PARAMETERS Year 1 2 3 4 5 6 7 8 9 10 11 12 O & M Charges incl. Insurance (%) 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 O & M Inflation rate (%) 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 Rate of return on equity (%) 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 Rate of Depreciation (ES Act) (%) 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 Rate of Depreciation (IT Act) (%) 25.00 25.00 25.00 25.00 25.00 25.00 25.00 25.00 25.00 25.00 25.00 25.00 Spares for 1 yr -1/5th C.S 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 Auxiliary consumption (%) 0.70 0.70 0.70 0.70 0.70 0.70 0.70 0.70 0.70 0.70 0.70 0.70 Transformation Losses (%) 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50

SCHEDULE OF LOAN REPAYMENT AGENCY Year 1 2 3 4 5 6 7 8 9 10 11 12

FINANCIAL INSTITUTIONS Outstanding Term loan 714.90 643.41 571.92 500.43 428.94 357.45 285.96 214.47 142.98 71.49 0.00 0.00 Term loan installment 71.49 71.49 71.49 71.49 71.49 71.49 71.49 71.49 71.49 71.49 0.00 0.00 Cum. Loan Repaid 71.49 142.98 214.47 285.96 357.45 428.94 500.43 571.92 643.41 714.90 714.90 714.90 Interest on Term loan 67.92 60.77 53.62 46.47 39.32 32.17 25.02 17.87 10.72 3.57 0.00 0.00 Total Yearly installment 139.41 132.26 125.11 117.96 110.81 103.66 96.51 89.36 82.21 75.06 0.00 0.00

LOAN SERVICING Outstanding Term loan 714.90 643.41 571.92 500.43 428.94 357.45 285.96 214.47 142.98 71.49 0.00 0.00 Loan Repayment Installment 71.49 71.49 71.49 71.49 71.49 71.49 71.49 71.49 71.49 71.49 0.00 0.00 Sources of Funds for Repayment - Depreciation (ES Act) 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 0.00 0.00 - Advance Depreciation 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - Additional sources (ROE ) 40.21 40.21 40.21 40.21 40.21 40.21 40.21 40.21 40.21 40.21 0.00 0.00

COMPUTATION OF TARIFF COMPONENTS

INTEREST ON CAPITAL Interest on Term loan 67.92 60.77 53.62 46.47 39.32 32.17 25.02 17.87 10.72 3.57 0.00 0.00 Total Yearly Installment 139.41 132.26 125.11 117.96 110.81 103.66 96.51 89.36 82.21 75.06 0.00 0.00

4/14 Annexure - 13.3 SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME (Underground Power House) TARIFF CALCULATIONS WITH PROJECTED COMPLETION COST

Debt:Equity Ratio 7.0 : 3.0

Yr 1 Yr 2 Yr 3 Yr 4 Yr 5 Yr 6 Yr 7 Yr 8 Yr 9 Yr 10 Yr 11 Yr 12

RATE OF RETURN Equity amount 178.73 178.73 178.73 178.73 178.73 178.73 178.73 178.73 178.73 178.73 178.73 178.73 Return on Equity 28.60 28.60 28.60 28.60 28.60 28.60 28.60 28.60 28.60 28.60 28.60 28.60

O & M EXPENSES 13.40 14.07 14.78 15.52 16.29 17.11 17.96 18.86 19.80 20.79 21.83 22.93

INTEREST ON WORKING CAPITAL

WORKING CAPITAL O & M Expenses - 1 month 1.12 1.17 1.23 1.29 1.36 1.43 1.50 1.57 1.65 1.73 1.82 1.91 Spares 1 year - 1/5th cap spares 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 Receivables for 2 months DEP(ES Act) 5.21 5.21 5.21 5.21 5.21 5.21 5.21 5.21 5.21 5.21 5.21 5.21 Interest 11.32 10.13 8.94 7.74 6.55 5.36 4.17 2.98 1.79 0.60 0.00 0.00 Return on Equity 4.77 4.77 4.77 4.77 4.77 4.77 4.77 4.77 4.77 4.77 4.77 4.77 O&M 2.23 2.35 2.46 2.59 2.72 2.85 2.99 3.14 3.30 3.47 3.64 3.82 I.Tax 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Interest on W.C. 0.32 0.31 0.30 0.29 0.27 0.26 0.25 0.24 0.23 0.21 0.21 0.21 Total Working capital 26.76 25.72 24.69 23.68 22.67 21.67 20.68 19.70 18.73 17.77 17.43 17.71 Interest on Working Capital 2.61 2.51 2.41 2.31 2.21 2.11 2.02 1.92 1.83 1.73 1.70 1.73

DEPRECIATION (ES ACT) (INR crores) Total Depreciable Amount 804.26 772.99 741.71 710.43 679.16 647.88 616.60 585.33 554.05 522.77 491.50 460.22 Opening Depreciation Fund 0.00 -40.21 -80.43 -120.64 -160.85 -201.07 -201.07 -201.07 -201.07 -201.07 -201.07 -169.79 Yearly Depreciation (ES Act) 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 Cumulative Depreciation Fund 31.28 -8.94 -49.15 -89.36 -129.58 -169.79 -169.79 -169.79 -169.79 -169.79 -169.79 -138.51 Loan Repayment Installment 71.49 71.49 71.49 71.49 71.49 71.49 71.49 71.49 71.49 71.49 0.00 0.00 Advance Dep. for loan Repayment 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Return on Eq. for loan Repayment 40.21 40.21 40.21 40.21 40.21 40.21 40.21 40.21 40.21 40.21 0.00 0.00 Closing Cummulative Dep. Fund -40.21 -80.43 -120.64 -160.85 -201.07 -201.07 -201.07 -201.07 -201.07 -201.07 -169.79 -138.51 Total Depreciation 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 Net Depreciable Amount 804.26 772.99 741.71 710.43 679.16 647.88 616.60 585.33 554.05 522.77 491.50 460.22

DEPRECIATION (IT ACT) (INR crores) Sum at charge 893.63 670.22 502.67 377.00 282.75 212.06 159.05 119.28 89.46 67.10 50.32 37.74 Depreciation (IT Act) 223.41 167.56 125.67 94.25 70.69 53.02 39.76 29.82 22.37 16.77 12.58 9.44 Dep.limited to 90% of capital cost 223.41 167.56 125.67 94.25 70.69 53.02 39.76 29.82 0.10 0.00 0.00 0.00

5/14 Annexure - 13.3 SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME (Underground Power House) TARIFF CALCULATIONS WITH PROJECTED COMPLETION COST

Debt:Equity Ratio 7.0 : 3.0

Yr 1 Yr 2 Yr 3 Yr 4 Yr 5 Yr 6 Yr 7 Yr 8 Yr 9 Yr 10 Yr 11 Yr 12

TAX LIABILITY (INR crores) Yearly Profit/loss -163.53 -107.68 -65.79 -34.38 -10.81 6.86 20.11 30.05 59.77 59.87 59.87 59.87 Cummulative Profit/loss (+/-) -163.53 -271.22 -337.01 -371.39 -382.20 -375.34 -355.23 -325.18 -265.41 -205.53 -145.66 -85.79 Tax liability 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

CAPACITY AND ENERGY CHARGES Annual Capacity Charge (INR crores) 99.19 92.04 84.89 77.75 70.60 63.45 56.30 49.15 42.00 34.85 31.28 31.28

Annual Energy Charge (INR crores) 44.61 45.18 45.78 46.42 47.10 47.82 48.58 49.38 50.23 51.12 52.13 53.25

Total Annual Charge (INR crores) 143.80 137.22 130.68 124.17 117.70 111.26 104.87 98.53 92.23 85.98 83.41 84.53 Average Tariff (INR/kWh) 1.55 1.48 1.41 1.34 1.27 1.20 1.13 1.06 1.00 0.93 0.90 0.91 Average Tariff for 5 years (INR/kWh) 1.41 1.06 1.02

Discount rate (%) 12.00 / Year 1 2 3 4 5 6 7 8 91011 12 Discounted Average Tariff (INR/kWh) 1.55 1.32 1.12 0.95 0.81 0.68 0.57 0.48 0.40 0.33 0.29 0.26 Levellised Eq.Avg. Tariff (INR/kWh) 1.25

6/14 Annexure - 13.3 SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME (Underground Power House) TARIFF CALCULATIONS WITH PROJECTED COMPLETION COST

Debt:Equity Ratio 7.0 : 3.0

Yr 13 Yr 14 Yr 15 Yr 16 Yr 17 Yr 18 Yr 19 Yr 20 Yr 21 Yr 22 Yr 23 Yr 24

FINANCIAL PACKAGE (INR crores)

Loan Component 714.9

Fin. Institutions 714.90

Equity component 178.73 268.09 893.6

Period Repayment Moratorium Installment/yr.

Financial Inst. 10 0 1

Repayment Amount/year Financial Institutions 71.49

Construction Period (Yrs.) 5.75

7/14 Annexure - 13.3 SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME (Underground Power House) TARIFF CALCULATIONS WITH PROJECTED COMPLETION COST

Debt:Equity Ratio 7.0 : 3.0

Yr 13 Yr 14 Yr 15 Yr 16 Yr 17 Yr 18 Yr 19 Yr 20 Yr 21 Yr 22 Yr 23 Yr 24

NORMATIVE PARAMETERS Year 13 14 15 16 17 18 19 20 21 22 23 24 O & M Charges incl. Insurance (%) 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 O & M Inflation rate (%) 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 Rate of return on equity (%) 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 Rate of Depreciation (ES Act) (%) 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 Rate of Depreciation (IT Act) (%) 25.00 25.00 25.00 25.00 25.00 25.00 25.00 25.00 25.00 25.00 25.00 25.00 Spares for 1 yr -1/5th C.S 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 Auxiliary consumption (%) 0.70 0.70 0.70 0.70 0.70 0.70 0.70 0.70 0.70 0.70 0.70 0.70 Transformation Losses (%) 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50

SCHEDULE OF LOAN REPAYMENT AGENCY Year 13 14 15 16 17 18 19 20 21 22 23 24

FINANCIAL INSTITUTIONS Outstanding Term loan 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Term loan installment 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Cum. Loan Repaid 714.90 714.90 714.90 714.90 714.90 714.90 714.90 714.90 714.90 714.90 714.90 714.90 Interest on Term loan 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Total Yearly installment 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

LOAN SERVICING Outstanding Term loan 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Loan Repayment Installment 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Sources of Funds for Repayment - Depreciation (ES Act) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - Advance Depreciation 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - Additional sources (ROE ) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

COMPUTATION OF TARIFF COMPONENTS

INTEREST ON CAPITAL Interest on Term loan 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Total Yearly Installment 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

8/14 Annexure - 13.3 SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME (Underground Power House) TARIFF CALCULATIONS WITH PROJECTED COMPLETION COST

Debt:Equity Ratio 7.0 : 3.0

Yr 13 Yr 14 Yr 15 Yr 16 Yr 17 Yr 18 Yr 19 Yr 20 Yr 21 Yr 22 Yr 23 Yr 24

O & M EXPENSES 24.07 25.28 26.54 27.87 29.26 30.72 32.26 33.87 35.57 37.34 39.21 41.17

INTEREST ON WORKING CAPITAL

WORKING CAPITAL O & M Expenses - 1 month 2.01 2.11 2.21 2.32 2.44 2.56 2.69 2.82 2.96 3.11 3.27 3.43 Spares 1 year - 1/5th cap spares 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 Receivables for 2 months DEP(ES Act) 5.21 5.21 5.21 5.21 5.21 5.21 5.21 5.21 5.21 5.21 5.21 5.21 Interest 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Return on Equity 4.77 4.77 4.77 4.77 4.77 4.77 4.77 4.77 4.77 4.77 4.77 4.77 O&M 4.01 4.21 4.42 4.64 4.88 5.12 5.38 5.65 5.93 6.22 6.54 6.86 I.Tax 0.00 2.55 4.49 4.49 4.49 4.49 4.49 4.49 4.49 4.49 4.49 4.49 Interest on W.C. 0.22 0.25 0.28 0.28 0.29 0.29 0.30 0.30 0.31 0.31 0.32 0.32 Total Working capital 18.00 20.88 23.17 23.51 23.86 24.23 24.62 25.03 25.45 25.90 26.38 26.87 Interest on Working Capital 1.76 2.04 2.26 2.29 2.33 2.36 2.40 2.44 2.48 2.53 2.57 2.62

DEPRECIATION (ES ACT) (INR crores) Total Depreciable Amount 428.94 397.66 366.39 335.11 303.83 272.56 241.28 210.00 178.73 147.45 116.17 84.89 Opening Depreciation Fund -138.51 -107.24 -75.96 -44.68 -13.40 17.87 49.15 80.43 111.70 142.98 174.26 205.53 Yearly Depreciation (ES Act) 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 Cumulative Depreciation Fund -107.24 -75.96 -44.68 -13.40 17.87 49.15 80.43 111.70 142.98 174.26 205.53 236.81 Loan Repayment Installment 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Advance Dep. for loan Repayment 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Return on Eq. for loan Repayment 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Closing Cummulative Dep. Fund -107.24 -75.96 -44.68 -13.40 17.87 49.15 80.43 111.70 142.98 174.26 205.53 236.81 Total Depreciation 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 Net Depreciable Amount 428.94 397.66 366.39 335.11 303.83 272.56 241.28 210.00 178.73 147.45 116.17 84.89

DEPRECIATION (IT ACT) (INR crores) Sum at charge 28.31 21.23 15.92 11.94 8.96 6.72 5.04 3.78 2.83 2.13 1.59 1.20 Depreciation (IT Act) 7.08 5.31 3.98 2.99 2.24 1.68 1.26 0.94 0.71 0.53 0.40 0.30 Dep.limited to 90% of capital cost 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

9/14 Annexure - 13.3 SIRKARI BHYOL RUPSIABAGAR HYDEL SCHEME (Underground Power House) TARIFF CALCULATIONS WITH PROJECTED COMPLETION COST

Debt:Equity Ratio 7.0 : 3.0

Yr 13 Yr 14 Yr 15 Yr 16 Yr 17 Yr 18 Yr 19 Yr 20 Yr 21 Yr 22 Yr 23 Yr 24

TAX LIABILITY (INR crores) Yearly Profit/loss 59.87 59.87 59.87 59.87 59.87 59.87 59.87 59.87 59.87 59.87 59.87 59.87 Cummulative Profit/loss (+/-) -25.92 33.96 93.83 153.70 213.58 273.45 333.32 393.20 453.07 512.94 572.82 632.69 Tax liability 0.00 15.28 26.94 26.94 26.94 26.94 26.94 26.94 26.94 26.94 26.94 26.94

CAPACITY AND ENERGY CHARGES Annual Capacity Charge (INR crores) 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28 31.28

Annual Energy Charge (INR crores) 54.42 71.19 84.34 85.70 87.13 88.62 90.20 91.85 93.59 95.41 97.32 99.33

Total Annual Charge (INR crores) 85.70 102.47 115.61 116.97 118.40 119.90 121.48 123.13 124.86 126.69 128.60 130.61 Average Tariff (INR/kWh) 0.93 1.11 1.25 1.26 1.28 1.29 1.31 1.33 1.35 1.37 1.39 1.41 Average Tariff for 5 years (INR/kWh) 1.30 1.39

Discount rate (%) 12.00 / Year 13 14 15 16 17 18 19 20 21 22 23 24 Discounted Average Tariff (INR/kWh) 0.24 0.25 0.26 0.23 0.21 0.19 0.17 0.15 0.14 0.13 0.11 0.10 Levellised Eq.Avg. Tariff (INR/kWh)

10/14 Annexure - 13.3

7.0 : 3.0

Yr 25 Yr 26 Yr 27 Yr 28 Yr 29 Yr 30 Yr 31 Yr 32 Yr 33 Yr 34 Yr 35

BASIC PARAMETERS Capacity (MW) 210.00 210.00 210.00 210.00 210.00 210.00 210.00 210.00 210.00 210.00 210.00 Capital Cost (INR crores) 752.56 752.56 752.56 752.56 752.56 752.56 752.56 752.56 752.56 752.56 752.56 Capital Cost with IDC . 893.63 893.63 893.63 893.63 893.63 893.63 893.63 893.63 893.63 893.63 893.63 Equity Portion (%) 20.00 20.00 20.00 20.00 20.00 20.00 20.00 20.00 20.00 20.00 20.00 Debt Portion (%) 80.00 80.00 80.00 80.00 80.00 80.00 80.00 80.00 80.00 80.00 80.00 Capital Cost/MW (INR crores) 4.26 4.26 4.26 4.26 4.26 4.26 4.26 4.26 4.26 4.26 4.26 Interest rate for WC (%) 9.75 9.75 9.75 9.75 9.75 9.75 9.75 9.75 9.75 9.75 9.75 Tax rate (%) 30.00 30.00 30.00 30.00 30.00 30.00 30.00 30.00 30.00 30.00 30.00 Interest rate on loan from Financial Institutions (%) 10.00 10.00 10.00 10.00 10.00 10.00 10.00 10.00 10.00 10.00 10.00 Total annual energy (GWh) 967.97 967.97 967.97 967.97 967.97 967.97 967.97 967.97 967.97 967.97 967.97 Design energy with 90% dependibility (GWh) 937.23 937.23 937.23 937.23 937.23 937.23 937.23 937.23 937.23 937.23 937.23 Saleable Energy after aux. (GWh) 926.02 926.02 926.02 926.02 926.02 926.02 926.02 926.02 926.02 926.02 926.02 consumption & transformation losses

FINANCIAL PACKAGE (INR crores)

Loan Component 714.9

Fin. Institutions 714.90

Equity component 178.73 268.09 893.6

Period Repayment Moratorium Installment/yr.

Financial Inst. 10 0 1

Repayment Amount/year Financial Institutions 71.49

Construction Period (Yrs.) 5.75

11/14 Annexure - 13.3

7.0 : 3.0

Yr 25 Yr 26 Yr 27 Yr 28 Yr 29 Yr 30 Yr 31 Yr 32 Yr 33 Yr 34 Yr 35

NORMATIVE PARAMETERS Year 25 26 27 28 29 30 31 32 33 34 35 O & M Charges incl. Insurance (%) 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 O & M Inflation rate (%) 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 Rate of return on equity (%) 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 Rate of Depreciation (ES Act) (%) 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 Rate of Depreciation (IT Act) (%) 25.00 25.00 25.00 25.00 25.00 25.00 25.00 25.00 25.00 25.00 25.00 Spares for 1 yr -1/5th C.S 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 Auxiliary consumption (%) 0.70 0.70 0.70 0.70 0.70 0.70 0.70 0.70 0.70 0.70 0.70 Transformation Losses (%) 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50

SCHEDULE OF LOAN REPAYMENT AGENCY Year 25 26 27 28 29 30 31 32 33 34 35

FINANCIAL INSTITUTIONS Outstanding Term loan 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Term loan installment 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Cum. Loan Repaid 714.90 714.90 714.90 714.90 714.90 714.90 714.90 714.90 714.90 714.90 714.90 Interest on Term loan 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Total Yearly installment 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

LOAN SERVICING Outstanding Term loan 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Loan Repayment Installment 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Sources of Funds for Repayment - Depreciation (ES Act) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - Advance Depreciation 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - Additional sources (ROE ) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

COMPUTATION OF TARIFF COMPONENTS

INTEREST ON CAPITAL Interest on Term loan 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Total Yearly Installment 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

12/14 Annexure - 13.3

7.0 : 3.0

Yr 25 Yr 26 Yr 27 Yr 28 Yr 29 Yr 30 Yr 31 Yr 32 Yr 33 Yr 34 Yr 35

RATE OF RETURN Equity amount 178.73 178.73 178.73 178.73 178.73 178.73 178.73 178.73 178.73 178.73 178.73 Return on Equity 28.60 28.60 28.60 28.60 28.60 28.60 28.60 28.60 28.60 28.60 28.60

O & M EXPENSES 43.23 45.39 47.66 50.04 52.55 55.17 57.93 60.83 63.87 67.06 70.42

INTEREST ON WORKING CAPITAL

WORKING CAPITAL O & M Expenses - 1 month 3.60 3.78 3.97 4.17 4.38 4.60 4.83 5.07 5.32 5.59 5.87 Spares 1 year - 1/5th cap spares 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 1.79 Receivables for 2 months DEP(ES Act) 5.21 3.72 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Interest 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Return on Equity 4.77 4.77 4.77 4.77 4.77 4.77 4.77 4.77 4.77 4.77 4.77 O&M 7.21 7.57 7.94 8.34 8.76 9.20 9.66 10.14 10.65 11.18 11.74 I.Tax 4.49 3.82 2.14 2.14 2.14 2.14 2.14 2.14 2.14 2.14 2.14 Interest on W.C. 0.33 0.31 0.25 0.26 0.27 0.27 0.28 0.29 0.30 0.31 0.32 Total Working capital 27.39 25.76 20.86 21.47 22.10 22.77 23.46 24.20 24.97 25.77 26.62 Interest on Working Capital 2.67 2.51 2.03 2.09 2.15 2.22 2.29 2.36 2.43 2.51 2.60

DEPRECIATION (ES ACT) (INR crores) Total Depreciable Amount 53.62 22.34 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Opening Depreciation Fund 236.81 268.09 290.43 290.43 290.43 290.43 290.43 290.43 290.43 290.43 290.43 Yearly Depreciation (ES Act) 31.28 22.34 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Cumulative Depreciation Fund 268.09 290.43 290.43 290.43 290.43 290.43 290.43 290.43 290.43 290.43 290.43 Loan Repayment Installment 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Advance Dep. for loan Repayment 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Return on Eq. for loan Repayment 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Closing Cummulative Dep. Fund 268.09 290.43 290.43 290.43 290.43 290.43 290.43 290.43 290.43 290.43 290.43 Total Depreciation 31.28 22.34 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Net Depreciable Amount 53.62 22.34 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

DEPRECIATION (IT ACT) (INR crores) Sum at charge 0.90 0.67 0.50 0.38 0.28 0.21 0.16 0.12 0.09 0.07 0.05 Depreciation (IT Act) 0.22 0.17 0.13 0.09 0.07 0.05 0.04 0.03 0.02 0.02 0.01 Dep.limited to 90% of capital cost 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

13/14 Annexure - 13.3

7.0 : 3.0

Yr 25 Yr 26 Yr 27 Yr 28 Yr 29 Yr 30 Yr 31 Yr 32 Yr 33 Yr 34 Yr 35

TAX LIABILITY (INR crores) Yearly Profit/loss 59.87 50.94 28.60 28.60 28.60 28.60 28.60 28.60 28.60 28.60 28.60 Cummulative Profit/loss (+/-) 692.56 743.50 772.09 800.69 829.29 857.88 886.48 915.07 943.67 972.27 1000.86 Tax liability 26.94 22.92 12.87 12.87 12.87 12.87 12.87 12.87 12.87 12.87 12.87

CAPACITY AND ENERGY CHARGES Annual Capacity Charge (INR crores) 31.28 22.34 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Annual Energy Charge (INR crores) 101.44 99.42 91.16 93.60 96.17 98.86 101.69 104.65 107.77 111.04 114.48

Total Annual Charge (INR crores) 132.72 121.76 91.16 93.60 96.17 98.86 101.69 104.65 107.77 111.04 114.48 Average Tariff (INR/kWh) 1.43 1.31 0.98 1.01 1.04 1.07 1.10 1.13 1.16 1.20 1.24 Average Tariff for 5 years (INR/kWh) 1.08 1.17

Discount rate (%) 12.00 / Year 25 26 27 28 29 30 31 32 33 34 35 Discounted Average Tariff (INR/kWh) 0.09 0.08 0.05 0.05 0.04 0.04 0.04 0.03 0.03 0.03 0.03 Levellised Eq.Avg. Tariff (INR/kWh)

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