Hongukhola Hydropower Project is PROR Hydro Project located in Solukhumbu district, The Feasibility  Study of Hongu Khola HEP on PROR is going on. The overall Sailent features of the project is listed below.

Project Type				RoR	PRoR
PROJECT LOCATION
Location
	Region		:	Eastern	Eastern
	Province No.		:	One	One
	District		:	Solukhumbu	Solukhumbu
	Rural Municipality		:	Chheskam VDC (Now, Mahakulung Rural Municipality)	Chheskam VDC (Now, Mahakulung Rural Municipality)
Project Boundary
	East		:	86°52’53″E	86°52’53″E
	West		:	86°54’31″E	86°54’31″E
	South		:	27°32’08″N	27°32’08″N
	North		:	27°34’40″N	27°34’40″N
GENEARL
River			:	Hongu	Hongu
Nearest Town			:	Salleri	Salleri
Type of Scheme			:	Run-of-River	Peaking Run-of-River
Highest Regulated Water Level			:		1966 masl
Lowest Regulated Water Level			:		1961 masl
Peaking Period			:		1-hour morning and 1-hour evening
Reservoir Volume			:		46,442 m3
Dead Storage Volume			:		10,600 m3
Live Storage Volume			:		32,000 m3
Gross Head			:	310 m	314 m
Rated Net Head			:	294 m	294 m
HYDROLOGY
Catchment Area			:	321.5 km2	321.5 km2
Design Discharge			:	11.71 m3/s	11.71 m3/s
Minimum Downstream Release			:	0.397 m3/s	0.397 m3/s
POWER AND ENERGY CALCULATIONS
Installed Capacity (MW)			:	28.9 MW	28.9 MW
Total Saleable Energy			:	167.43 GWh	167.43 GWh
		Dry Energy	:	31.49 GWh	51.85 GWh
		Wet Energy	:	135.94 GWh	115.58 GWh
DIVERSION TUNNEL
Type			:	Unlined	Unlined
Length			:	84 m	84 m
Size (B x H)			:	3 m x 3 m	3 m x 3 m
Slope			:	0.097	0.097
DIVERSION WEIR
Type			:	Ogee shaped Concrete Gravity Dam	Ogee shaped Concrete Gravity Dam with free overflow spillway
Dam Length			:	15.2 m	20.2 m
Dam Height (from river bed)			:	7.0 m	13.0 m
UNDERSLUICE
Size (B x H)			:	5 m x 2.5 m	5 m x 3 m
No. of Gates			:	1	2
INTAKE
Type			:	Side Intake with submerged orifice	Side Intake with submerged orifice
Size of Intake Opening (B x H)			:	4.0 m x 2.4 m	4.0 m x 2.4 m
No. of Openings			:	2	2
Velocity of Flow at Intake Trash-rack			:	0.6 m/s	0.6 m/s
Trash-rack Cleaner			:	Manual by raking	Manual by raking
GRAVEL TRAP
Average Length			:	7.6 m	7.6 m
Size (B x H)			:	2.7 x 3.0 m	2.7 x 3.0 m
GRAVEL TRAP FLUSHING CULVERT
Length			:	13.0 m	13.0 m
Size (B x H)			:	1.3 x 1.3 m	1.3 x 1.3 m
APPROCH TUNNEL
Type			:	Inverted D-shaped unlined and partially concrete lined tunnel	Inverted D-shaped unlined and partially concrete lined tunnel
Depth			:	3.5 m	3.5 m
Width			:	3.5 m	3.5 m
Bed Slope			:	1 in 200	1 in 200
Length			:	255 m	255 m
BRANCH TUNNEL (TO SETTLING BASIN)
Type			:	Inverted D Shaped Concrete Lined	Inverted D Shaped Concrete Lined
Length			:	92 m (46 m each)	92 m (46 m each)
Size			:	2.5 m x 2.5 m	2.5 m x 2.5 m
SETTLING BASIN
Type			:	Hopper shaped underground with mechanized flushing	Hopper shaped underground with mechanized flushing
Sediment Size to be Settled			:	90% of 0.2 mm	90% of 0.2 mm
No. of Bays			:	2	2
Length			:	100 m	100 m
Width of uniform section			:	8.0 m	8.0 m
Depth of uniform section (spring line to hopper top)			:	5.7 m	5.7 m
Depth of hopper			:	2.2 m	2.2 m
LINK TUNNEL (SETTLING BASIN TO HRT)
Type			:	Inverted D Shaped Concrete Lined	Inverted D Shaped Concrete Lined
Length			:	82 m (41 m each)	91 m (45.5 m each)
Size			:	2.5 m x 2.5 m	2.5 m x 2.5 m
ADIT/ACCESS/FLUSHING TUNNEL
Total Length			:	417 m	487m
Size			:	Various	Various
HEADRACE TUNNEL
Type			:	Low Pressure Tunnel	Low Pressure Tunnel
Total Length (starting from link tunnel)			:	2 890 m	2 890 m
Excavated size of Tunnel (B x H)			:	3.5 m x 3.5 m	3.5 m x 3.5 m
Shape			:	Inverted D-shaped	Inverted D-shaped
SURGE SHAFT
Type			:	Simple, Vertical Shaft Underground, RCC Lined	Restricted Orifice Type or Steel Pipe
Finished Diameter			:	6.0 m	6.0 m
Upsurge Level			:	1 968.7 masl	1 974.7 masl
Down-surge Level			:	1 947.3 masl	1 947.3 masl
Top of surge shaft			:	1 985.0 masl	1 979.0 masl
Total Height			:	45 m	36.5 m
HEADRACE PIPE
Material			:		MS Pipe
Length (including embedded in HRT)			:		245 m
Diameter			:		2.5 m
PENSTOK PIPE
Surface Pipe			:	662 m length, 2.0 m dia.	570 m length, 2.0 m dia.
Diameter of penstock			:	2 000 mm before branching	2 000 mm before branching
Vertical Shaft with penstock			:	141 m length, excavated dia 3.2 m.	141 m length, excavated dia 3.2 m.
Inclined Shaft with penstock			:	167 m length, excavated width 3.0 m	167 m length, excavated width 3.0 m
Penstock on Surface			:	22 m length	22 m length
Branch pipe			:	77 m (dia 1.3 m and 0.9 m)	77 m (dia 1.3 m and 0.9 m)
Thickness			:	8 mm to 30 mm	8 mm to 30 mm
Material			:	Mild steel	Mild steel
POWERHOSUE
Type			:	Semi-surface	Semi-surface
Size (L x B x H)			:	38 m x 17 m x 17 m	38 m x 17 m x 17 m
TAILRACE CULVERT
Type			:	RCC box culvert	RCC box culvert
Length			:	25 m	25 m
Size (B x H)			:	varies	varies
TURBINE
Type			:	Pelton, 4 jets	Pelton, 4 jets
No. of Units			:	2	2
Rated output			:	15 000 kW	15 000 kW
Max. Efficiency			:	90.50%	90.50%
Speed			:	428.6 RPM	428.6 RPM
GENERATOR
No. of Units			:	2	2
Efficiency			:	98%	98%
Generation voltage			:	11 kV	11 kV
Rated output			:	18 MVA	18 MVA
Frequency			:	50 Hz	50 Hz
Transformer
No. of Units			:	3 +1 spares	3 +1 spares
Efficiency			:	99%	99%
Rated Output			:	12 MVA	12 MVA
TRANSMISSION LINE AND GRID CONNECTION
Length			:	39 km, to Lamane s/s at Tingla	39 km, to Lamane s/s at Tingla
Voltage			:	132 kV, Single Circuit	132 kV, Single Circuit
CONSTRUCTION PERIOD			:	3 Years	3.5 Years

   

Table II: Summary of Monthly Energy (Based on Daily Energy Calculation)
Months	No. of Days	River Discharge [m³/s]	Riparian Discharge [m³/s]	Diverted Discharge [m³/s]	Net Head [m]	Power [MW]	Energy [GWh]	Net Energy [GWh]
January	31	4.94	0.397	4.54	307.59	11.72	8.72	8.63
February	28	4.21	0.397	3.82	308.3	9.87	6.87	6.8
March	31	3.98	0.397	3.58	308.51	9.26	6.89	6.82
April	30	4.36	0.397	3.96	308.16	10.23	7.37	7.15
May	31	6.55	0.397	6.15	305.4	15.75	11.72	11.13
June	30	18.01	0.397	11.71	295.73	27.19	19.58	18.6
July	31	47.13	0.397	11.71	294	28.89	21.49	20.42
August	31	58.3	0.397	11.71	294	28.89	21.49	20.42
September	30	42.62	0.397	11.71	294	28.89	20.8	19.76
October	31	20.56	0.397	11.71	294	28.89	21.49	20.42
November	30	9.8	0.397	9.4	299.71	23.34	16.8	15.96
December	31	6.52	0.397	6.12	305.57	15.69	11.67	11.32
Average		18.91				Total	174.89	167.43

 

Wet Energy (GWh)	115.58	69%
Dry Energy (GWh)	51.85	31%