2. Nepal is a developing country with huge
hydropower potential.
Hydropower is the most reliable and renewable
source of energy & abundantly available.
Does not cause any green house gasses or
pollution
Small HP project are feasible in our present
context due to less cost & quick output
1.1 Reasons for focusing on Hydropower Projects
3. According to NEA based on power output
1) Micro hydropower plant = <100KW
2) Mini hydropower plant = 100KW-1MW
3) Small hydropower plant = 1MW- 10MW
4) Medium hydropower plant=10MW-300MW
5) Large hydropower plant = > 300MW
1.2 Classification of Hydropower Project
4. Development region:Western
Zone: Gandaki
District: Gorkha
District headquarter: Gorkha
VDCs: Manbu
Longitude: 84° 53’ 00” to 84° 54’ 03” East
Latitude: 28° 10’ 08” to 28° 10’ 41” North
Type of scheme: Run of river (RoR)
Source river: Chhote Khola
General
EDC, HMG/N
W. Seti
Bheri
Kali
Gandaki
Trisuli
Marsayangdi
Burhi Gandaki
Arun
Sun Koshi
Dudh Koshi
Tama Koshi
Bagmati
Basin
Kankai
Basin
West Rapti
Babai
Sapta Koshi
Bhote
Koshi
Rapti
N
Upper Karnali
(300 MW)
Budhi Ganga
(22 MW)
Likhu Khola
(50 MW)
Tamur
(101 MW)
*
KATHMANDU
Rahughat Khola
(27 MW)
Kabeli ‘A’
(30 MW)
Dudh Koshi
(300 MW)
CHINA
INDIA
Andhi Khola
(5 MW)
Karnali (Chisapani)
(10,800 MW)
Bhote Khosi
(36 MW)
Kali Gandaki-2
(572 MW??)
West Seti
(750 MW)
Pancheshwar
(6,400 MW?)
Khimti Khola
(60 MW)
Jimruk
(12 MW)
Mahakali BasinLegend:
Karnali Basin
Gandaki Basin
Southern Rivers Basin
Gandaki Basin
Chhote Khola
Project Locat
5. Chhote Khola - tributary of Budhigandaki and
Budhigandaki - major tributary ofTrishuli River-Narayani
Perennial river
Originates from Chunar dada and Mandra dada hills with
the highest peak at elevation 4162m.
It is about 2 km upstream from the confluence with
Budigandaki.
Lies at about elevation of 895 m and located at about 1500
m upstream of the confluence with Budigandaki River.
The Chhote Khola basin drains towards east-west
direction
Catchment Physiography and Drainage
6. Reference Hydrology
Month Discharge(Q2)Days % Time exceedence Cumm Q2 Q1
Aug 441 31 8.333 8.333 441 4.43463687
Jul 412 31 8.333 16.667 412 4.14301676
Sept 317 30 8.333 25.000 317 3.1877095
Jun 228 30 8.333 33.333 228 2.29273743
Oct 155 31 8.333 41.667 155 1.55865922
45.000 135.4 1.36156425
May 106 30 8.333 50.000 106 1.06592179
Nov 81.1 30 8.333 58.333 81.1 0.81553073
Apr 59.1 30 8.333 66.667 59.1 0.59430168
Dec 50.3 31 8.333 75.000 50.3 0.50581006
Jan 36.3 31 8.333 83.333 36.3 0.36502793
Mar 35.9 31 8.333 91.667 35.9 0.36100559
Feb 31 28 8.333 100.000 31 0.31173184
In terms of month with reference to Budi Gandaki at Aru Ghat
7. Reference Hydrology
Month Discharge(Q2)Days % Time exceedence Cumm Q1
Aug 3.91 31 8.333 8.333 12.42
Sept 3 30 8.333 16.667 9.52941
Jul 2.77 31 8.333 25.000 8.79882
Oct 1.39 31 8.333 33.333 4.41529
Jun 0.914 30 8.333 41.667 2.90329
45.000 2.60598
Nov 0.68 30 8.333 50.000 2.16
Dec 0.458 31 8.333 58.333 1.45482
Jan 0.377 31 8.333 66.667 1.19753
May 0.356 30 8.333 75.000 1.13082
Feb 0.315 28 8.333 83.333 1.00059
Mar 0.287 31 8.333 91.667 0.91165
Apr 0.277 30 8.333 100.000 0.87988
In terms of Month with reference to Bagmati at Sundarijal
Q45 = 2.6 m3/s
16. No. of orifice = 2
Width of orifice = 1.5m
Height of orifice = 1.5m
Type of gate = vertical gate
Location = left bank
Trash rack = 20mm thick bar 100mm c/c
spacing at 75o
Discharge pass through orifice = 3.12m3/s
30. Type: RCC tank
Storage period: 180 s
Effective length: 36.00 m
Width: 2.5 m
Effective depth: 5.2 m
Normal water level: 970.2 m amsl
Spillway:
Type: ogee
L = 8.3m
B= 2m
H=5.2m
Flush pipe dia= 0.2m
FlushingCanal=1 x 0.5 m
Air vent pipe: dia. 0.2m
31.
32.
33. Type: Surface, mild steel circular shaped
Length: 153 m
Internal diameter: 1 m
Thickness: 35 mm
Design flow: 2.6 m3/s
No. of anchor blocks: 7
No. of support piers: 25
37. Type: Surface type, RCC structure
Length: 27.5 m
Width: 6.5 m
Height: 6.5 m
Turbine axis level: 896m amsl
Tailrace length: 10.0 m from after tailrace
junction
Tailrace width: 1.0 m
Tailrace depth: 0.50 m
38. FIG: PLAN SHOWING POWER HOUSE andTAIL RACE
Tail Race
Penstock
Power House
39. Type: Francis (2 units)
Rated capacity: 735 kW one unit
Tail water level: 893.16 m amsl
Rated flow: 1.3 m3/s for one unit
Rated speed: 300 rpm
Specific Speed ofTurbine: 62.4 rpm
40. S.No. Partiiculars Amount
1 Summary of Pre-operating expenses 2,800,000.00
2 Environmental cost, Land acquisition 1,800,000.00
3 Infrastructure Development (Access road and construction power) 32,500,000.00
4 Civil Construction Works 47,132,963.39
5 Hydromechanical Works 9,701,580.00
6 Electromechanical Works 13,173,300.00
7 Transmission line and interconnection facilities 12,600,000.00
8 Office and camping facilities 2,000,000.00
9 Office equipment and vehicle 3,000,000.00
10 Engineering, supervision, contract administration and management 6,175,000.00
11 Health and safety 700,000.00
Total Project Cost without financing 131,582,843.39
Interest During Construction 13,158,284.34
Total Project CostWith financing 144,741,127.73
Cost Per kW (US$) (1 US$=NRs. 85) 3,406
41. Summary of Pre-operating
expenses
2%
Environmental cost, Land acquisition
1%
Infrastructure Development (Access
road and construction power)
25%
Civil Construction Works
36%
Hydromechanical Works
7%
Electromechanical Works
10%
Transmission line and
interconnection facilities
10%
Office and camping facilities
1%
Office equipment and vehicle
2%
Engineering, supervision, contract
administration and management
5%
Health and
safety
1%
SUMMARY OF COST