Mai Cascade Project

Project location

 

Region

Eastern Development Region

District

Ilam

Zone

Mechi

Intake site

Danabari VDC

Powerhouse site

Danabari VDC

Access to the project site

Via. East-west highway up to Birtamode and about 25 km long blacktopped/ graveled link road north from Birtamode

Geographic Coordinates

 

  • Longitude

 87052’1.92” E to 87053’9.16” E

  • Latitude

27045’43.37” N to 27047’39.78” N

Altitude

155 - 200 m (amsl)

General

 

Name of the river

Mai Khola

Nearest Town

Birtamode Bazar         

Types of Scheme

Run-of-river

Gross Head

42.65 m

Net Head

34.59 m

Installed capacity

7,000 kW

Average annual estimated energy

38,422,444 KWh

Hydrology

 

Catchment Area

589.0 km2(at MHP intake)

Average Flow

32.66 m3/s (minimum monthly flow 7.22 m3/s)

Design Flow

23.43 m3/s (40% exceedence flow)

90% Exceedence flow

7.48 m3/s

Design Flood (Q100) at MHP headworks

2070 m3/s

Name of River

Mai Khola

Note: The hydrology of MCHP is same as MHP

Intake canal (Headworks)

 

Type of Structure

RCC rectangular canal

Water level

 

  • Maximum

199.0 m (amsl)

  • Minimum

198.15 m (amsl)

Design Discharge

23.43 m3/s

Length

89.73 m

 

 

Headrace Canal/Culvert

 

  • Total Length

3719.66 m

  • Size

Rectangular: Height = (3.0 + 0.5) m, Width = 3.5 m, Trapezoidal: Bottom width = 2.5 m, Top width = 6.9 m, Height = (2.15+1.0) m

 

  • Bed slope

1:1000(V:H)

  • HR culvert (Trapezoidal)

L= 1851.66m

  • HR culvert (Rectangular)

L= 1798.0m

  • HR Transition panels

L=70.0m( 7 nos ,10m each)

Kholsi Crossing System

 

  1. Kholsi Crossings (With rectangular culvert)

 

  • Crossing No-01 (Sarangi Kholsi)

Span :17.00 m

  • Crossing No-02 (Bhimsen Kholsi)

Span: 42.60 m

  • Crossing No-03 (Tarbare Kholsi)

Span:7.60 m

  • Crossing No-04 (Ilame Kholsi)

Span: 29.00 m

  • Crossing No-05 (Aaptari Kholsi)

Span: 30.80 m

  1. Kholsi Crossings (With Trapezoidal canal

 

  • Crossing No-01 (MCHP IV Kholsi)

Span: 5.63 m

  • Crossing No-02 ( Bhotange Kholsi)

Span : 4.37 m

  • Crossing No-03 (Basnet Kholsi)

Span :13.60 m

  1. Kholsi Crossings (with Hume pipe arrangement)

 

    • Crossing No-01 ( Guhe-I Kholsi)

17.5 m x 1.20m Dia ; 2 Nos

    • Crossing No-02 (Tukre Kholsi)

15.0 m x 1.20m Dia ; 2 Nos

    • Crossing No-03(Bhotange Diversion Kholsi)

20.0 m x 1.20m Dia

    • Crossing No-04 (Guhe-II Kholsi)

22.50 m x 0 .90m Dia

    • Crossing No-05 (At CH.2+510)

22.50 m x 0.90m Dia

    • Crossing No-06 ( At CH.2+870)

15.0 m x 1.20m Dia

    • Crossing -07 ( At CH.3+072)

15.0 m x 0.90m Dia

    • Crossing -08 ( At CH.3+143)

20.0 m x 0.90m Dia

    • Crossing -09 ( At CH.3+450)

17.50 m x 0.90m Dia

    • Crossing -10 ( At CH.3+510)

22.50 m x 0.60m Dia

Forebay:

 

    • Size of Forebay(Avg.)

LxBxH = 60.15 m x 9.30 m x 6.44 m

    • Forebay Normal water level

194.544 m (amsl)

Spillway:

 

  1. Muse Khola Spillway:

 

    • Size of Spillway(Internal)

LxBxH = 25.34 m x 8.0 m x 4.4m

    • Normal Water Level at U/S

197.36 m (amsl)

    • Normal Water Level at D/S

195.46 m (amsl)

  1. Bhimsen Kholsi Spillway :

 

    • Size of Spillway(Internal)

LxBxH = 167.80 m x 10.0 m x 2.5 m

    • Types of Spillway

RCC rectangular open

    • Exit point

Lodhiya Khola

  1. Forebay Spillway & Spillway Canal :

 

  1. Spillway

 

    • Types of Spillway

RCC rectangular open

    • Spillway size(Internal)

180 m x 10.0 m x 2.5 m

  1. Spillway canal

 

    • Spillway Canal length

122.24 m

    •  Bottom width

3.00 m

    • Top width

9.30 m

    • Height

3.15 m

    • Exit Point

Ch. 0+084 of tailrace canal

Penstock:

 

    • Number

 3

    • Diameter/Thickness

1.5 m /10-14 mm thick

    • Length(Total)

218.50 m

    • Size of Gate on Penstock in Forebay

BxH = 2.42 m x 2.41 m

Powerhouse

 

    • Type

Surface

    • Powerhouse size

 

  1. Length

46.0 m

  1. Width

16.62 m

  1. Height

21.7 m

  1. P/H Floor Level

158.30

Tailrace

 

    • Type-I

RCC , Rectangular canal

    • Size

 

  1. Length

83.44 m

  1. Width

4.60 m

  1. Height

5.05 m

    • Normal tail water level

EL. 155.25m

    • Type-II

Gabion mattress lined,  trapezoidal canal

    • Size

 

  1. Length

128.52 m

  1. Top width

12.30 m

  1. Bottom width

6.0 m

  1. Height

3.15 m

Turbine

 

  • Type

Francis (Horizontal axis)

  • Number

3

  • Rated output capacity
  • Efficiency

2450 KW

92.50%

Governor

 

  • Type

Electronic with PID control

  • Adjustment for speed drop

Between 0 to 5%

Generator

 

  • Type

Synchronous 3 phases

  • Rated output capacity per unit

2917KVA

  • No of units

Three(3)

  • Power Factor

0.8

  • Voltage

6.3kV

  • Excitation system

Brushless

  • Efficiency

96.50%

Switchyard

 

  • Voltage level

33 kV

  • No. of bays

1

Transformer

 

  1. At Powerhouse

 

  • Type

Three Phase

  • Rated Capacity

9000KVA

  • Voltage Ratio

33/6.3 kV

  • Efficiency

99.0%

  1. At MHP  Switchyard

 

  • Type

3-phase, two windings, oil immersed transformer with off load tap-changer

  • Rated Capacity

9000KVA

  • Voltage Ratio

132/33 kV

  • Efficiency

99.0%

Transmission Line

 

  • Transmission line length

4 km

  • Voltage level

33 KV, single circuit

  • Conductor Type

ACSR ”DOG”

  • From

Powerhouse

  • To

Switchyard of Mai Hydropower Project

Power and energy

 

  • Installation capacity

7000 (3 x 2333.3) kW

  • Dry energy(annual average estimated)

6.322 GWh

  • Wet energy(annual average estimate)

32.099 GWh

  • Net Energy Output(annual average estimated)

38.422 GWh

Project Cost at completion

1,377 MNPR


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