Mai Cascade HP

Task: Desk study Licensing and Feasibility study preparation of Tender document Detailed engineering design Construction Supervision

Capacity: 7 MW

Status: Completed

SALIENT FEATURES:

Location:
1.1	Region	Eastern Development Region
1.2	District	Ilam
1.3	Zone	Mechi
1.4	Village	Danabari VDC
1.5	Access to the project site	Via. East-west highway upto Birtamode and about 30 km long blacktopped/ graveled link road north from Birtamod
1.6	Geographic Coordinates
	Longitude	87052’1.92” E to 87053’9.16” E
	Latitude	27045’43.37” N to 27047’39.78” N
1.7	Altitude	155 – 200 m (amsl)
	River Catchment
2.1	Catchment	589.0 km2
2.2	Name of River	Mai Khola
	Diversion Structure (Headworks)
3.1	Type of Structure	Canal Diversion (cascade to MHP)
3.2	Type of Trench	Rectangular and Trapezoidal Channel
3.3	Tail water level (El. m) at Powerhouse of MHP.
	Maximum	199 m (masl)
	Minimum	198.15 m (masl)
3.4	Maximum discharge capacity (Cumecs)	23.40 m3/s
3.5	Gates on entry to intake chamber	No
3.6	Headrace Canal/Culvert
	Total Length	3655 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 = (2.2+1) m
	HR culvert (Trapezoidal)	L= 1720 m
	HR culvert (Rectangular)	L= 1935 m
	Kholsi Crossing System
4.1	Kholsi Crossings (With rectangular culvert)
	Crossing No.- 1	LxBxH = (14.3 x 5.4 x 5.3) m
	Crossing No. – 2	LxBxH = (11.0 x 9.7 x 3.3) m
	Crossing No. – 3	LxBxH = (14.3 x 5.4 x 4.3) m
	Crossing No. – 4	LxBxH = (14.3 x 5.4 x 7.8) m
	Crossing No. – 5	LxBxH = (14.3 x 5.4 x 4.3) m
	Crossing No. – 6	LxBxH = (14.3 x 5.4 x 8.7) m
	Crossing No. – 7	LxBxH = (14.3 x 5.4 x 8.7) m
	Crossing No. – 8	LxBxH = (10.8 x 5.4 x 2.8) m
	Crossing No. – 9	LxBxH = (14.3 x 5.4 x 11.5) m
4.2	Kholsi Crossings (With hume pipe arrangement)
	Crossing No. – 01	LxBxH = (15.7 x 13.5 x 2.5) m
	Crossing No. – 02	LxBxH = (10.2 x 7.9 x 3.8) m
	Crossing no. – 03	LxBxH = (10.2 x 7.9 x 3.9) m
	Crossing No. – 04	LxBxH = (15.2 x 9.3 x 2.8) m
	Forebay
5.1	Size of Forebay	LxBxH = 67 x 19.1 x 9.1 m
5.2	Full Forebay level (El.m)	193.19 m amsl.
	Penstock
6.1	Number	1(Up to wyee), 3(After wyee)
6.2	Diameter/Thickness	Dia. = 2.6 m (Up to wyee), 1.5 m (After wyee) /10-14 mm thick
6.4	Length	27m (Up to wyee), 33 m (After wyee)
6.5	Size of gate on Penstock in Forebay	BxH = 3.2 m x 3.2 m
6.6	Trifurcation	Trifurcation from 2.6 m to three branches of 1.5 m diameter
	Powerhouse
7.1	Type	Surface
7.2	Head
	Gross head (from MHP Tailrace)	42.65 m
	Net head	34.59 m
7.3	Turbine
	Type	Francis (Horizontal Shaft)
	Number	3
	Output	2450 kW
7.4	Powerhouse size
	Length	57.30 m
	Width	15.20 m
	Height	9.3 m up to crane beam rail

7.5	Tailrace
	Type	RCC open canal
	Length	140 m
	Width	4.0 m
	Height	3.8 m

7.6	Installed capacity (kW)	3 x 2333.3 kW
7.7	Type of generator
	Generator specification	Synchronous salient pole type 2917 kVA, 6.3 kV, 0.8 power factor
	Excitation System	Digital Static Self Excitation
	Regulation System	AVR type
7.8	Powerhouse crane /lifting tackle capacity	24 ton
8	Power
8.1	Installation capacity	7000 kW
9	Switchyard
9.1	Voltage level	33 kV
9.2	No. of bays	1

Project Title: Mai Cascade HP