The document presents the design of a 1.469 MW run-of-river hydropower project on Chhote Khola in Gorkha District, Nepal. Key aspects of the design include a gross head of 80 m, design discharge of 2.6 m3/s, and installed capacity of 1.469 MW. The proposed project involves civil structures such as an intake, penstock, powerhouse, and tailrace. A cost estimate puts the total project cost at NRs. 144.74 million. An economic analysis yields a FIRR of 33.76% and NPV of NRs. 112.87 million.

1. Prepared by:
Laxman Gurung
Mohini Khyen
Niva Pradhan
Situ Sainju
Sanim Bajracharya
Sunir Lakhe
Group: P
Project Supervisor:
Er. Ram Gopal Kharbuja
FINAL PRESENTATION

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

8. 0
2
4
6
8
10
12
14
0.000 20.000 40.000 60.000 80.000 100.000 120.000
Discharge(m3/s)
Time exceedence %
bagmati
budhi gandaki
 From above curve
discharge at 45%
exceedence = 2.6m3/s
 Hence our design
discharge = 2.6m3/s

9. Flood frequency at 100 years return period
 Gumbell 199.6 m3/s
 log pearson 287.71 m3/s
 log normal 166.117 m3/s
 DHM 365.84 m3/s
 Adopted log Pearson value : 287.71 m3/s

10. 1.000
10.000
100.000
1000.000
10000.000
1 10 100 1000 10000
Dischargem3/s
Return Period
log normal
gumbel
log pearson

11. Catchment Area AtThe Intake 54 Km2
Gross Head 80 m
Design Discharge
2.6 m3/s @ 45%
Exceedence
Q100 (Design Flood) 287.71 m3/s

12.  P=ηγ QdH
 Taking,
η= 80%
γ=9810 N/m3
Qd= 2.6 m3/s
Net H=72 m (10% Head loss)
 Hence,
Power (P)=1.469 MW

13.  Gross head: 80 m
 Rated net head : 72 m
 Installed capacity: 1.469 MW
 Dry season energy: 3.23 GWh
 Wet season energy: 5.58 GWh
 Annual energy: 8.81 GWh

14.  Type = ogee shaped spillway
 High flood(Q100) = 287.71m3/s
 Flood pass through weir= 90% of Q100
= 259.119m3/s
 Height of weir = 4.3m
 Length of spillway = 10m

15. WEIR
INTAKE
GRAVELTRAP &
SETTLING BASIN

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

17. FIG: Plan of Weir

18.  Stone Lining
 Rectangular Stone Masonry
with cement mortar
 Cement Lining
 Plaster 20 mm
 Width = 2m
 Height = 1.0m

20.  Type: Gravity flushing type
 Overall length: 6.3 m
 Width: 2 m
 Overall depth: 1.3 m
 Particle size to be trapped: 2 mm
 Flushing flow: 0.31 m3/s
Flushing Pipe
 Diameter = 0.3m
 Slope=1:50
 Length= 18 m

23.  Type: Double chamber, continuous flushing type
 Settling zone length: 32.00 m
 Inlet transition length: 14.7 m
 Single basin width: 1.6 m
 Effective depth: 4.9 m
 Particle size to be settled: 0.2 mm with 90% settling
efficiency
 Design flow: 3.12 m3/s
 Settling velocity: 0.032m/s
Flushing Pipe
 Diameter= 0.214m
 Slope = 1:500

24. SPILLWAY in settling basin:
Type: Ogee
 Length=9m
 Breadth= 2m
 Height=4.9 m

26. Sectional view of settling basin

28.  Size : 1.7m x 0.9m
 Free board =0.3m

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

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

34. FOREBAY
PENSTOCKPOWER
HOUSE
TAIL RACE

35. FIG: L- SECTION OF PENSTOCK ALIGNMENT
Forebay
POWER
HOUSE
Anchor
Block

36.  SIZE:
 Length: 4m
 Breadth : 3m
 Height: 3
 Number :7

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

42.  Project cost (with IDC, ): 144,741,127.73
Mill NRs
 Cost per kW (with IDC): 3855 US$
(with rate 1 US$= NRs. 85)
 Debt equity ratio: 70/30
 FIRR: 33.76%
 NPV: 112.87 Mill NRs
 BC ratio: 1.75
 Return on equity: 52.73%

43.  Auto CAD
 SW-DTM
 Microsoft Excel
 MicrosoftWord