sorun hydrology

7/27/2019 Sorun Hydrology

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Head Loss Calculation

Design Discharge 5.72 m³/s

Normal Water Level at Weir 833.249 m

Tailrace level 744.905 m

Gross Head 88.344 m

SN Description Units Jan Feb Mar Apr May June July Aug Sept Oct

1 FrictionLossDischarge,Q m³/s 2.36 1.98 1.75 1.78 2.43 7.50 7.50 7.50 7.50 7.50

Number of Turbine operation 1.00 1.00 1.00 1.00 2.00 3.00 3.00 3.00 3.00 3.00

Diameter of pipe, D m 1.60 1.60 1.60 1.60 1.60 1.60 1.60 1.60 1.60 1.60

No. of pipes, N No. 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00

Velocity m/s 1.17 0.98 0.87 0.89 1.21 3.73 3.73 3.73 3.73 3.73

Pipe length, L m 340.00 340.00 340.00 340.00 340.00 340.00 340.00 340.00 340.00 340.00

Head Loss m 0.22 0.16 0.12 0.13 0.24 2.26 2.26 2.26 2.26 2.26

Total Fric t ion Loss m 0.22 0.16 0.12 0.13 0.24 2.26 2.26 2.26 2.26 2.26

2 Turbulence Loss

2.1 Entrance Loss

Loss coeff. 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20

Head Loss m 0.01 0.01 0.01 0.01 0.01 0.14 0.14 0.14 0.14 0.14

2.2 Bend Loss

Radius of bend, r m 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00

r/d 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13Bend angle (avg) deg 20.00 20.00 20.00 20.00 20.00 20.00 20.00 20.00 20.00 20.00

Loss coeff. 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10

No. of Bends 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00

Head Loss m 0.01 0.01 0.01 0.01 0.01 0.14 0.14 0.14 0.14 0.14

2.4 Valve Loss

Loss coeff. 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25

Head Loss m 0.02 0.01 0.01 0.01 0.02 0.18 0.18 0.18 0.18 0.18

2.5 Exit/Draft Tube Loss

Loss coeff. 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00

Head Loss 0.07 0.05 0.04 0.04 0.07 0.71 0.71 0.71 0.71 0.71

Total Turbu lence Losses m 0.12 0.08 0.06 0.07 0.12 1.17 1.17 1.17 1.17 1.17

Head Loss befo re Head Pond m 1.39 1.39 1.39 1.39 1.39 1.39 1.39 1.39 1.39 1.39

Total Head Loss 1.73 1.63 1.58 1.58 1.75 4.82 4.82 4.82 4.82 4.82

Net Head 86.61 86.71 86.77 86.76 86.59 83.52 83.52 83.52 83.52 83.52



Installed Capacity, kW 9,500 Rated Efficiencies

7.50 Generator

10% of minimum flow 0.195 Turbine

5% Transformer

160 Combined

Julian

Calendar

No of

days

River

Discharg

e

Reparia

n Flow

Available

Flow

Plant

Flow

Net

Head

Combi

ned

Efficie

ncy Power

Dry

season

energy

Wet season

energy Total Energy Outa

(m /s) (m /s) (m /s) (m /s) (m) % (kW) (kWh) (kWh) (kWh) (kW

Jan 31.00 2.55 0.19 2.36 2.36 151.00 85.54% 2,987 2,222,537 2,222,537 111

Feb 28.00 2.17 0.19 1.98 1.98 151.00 85.54% 2,509 1,685,809 1,685,809 84

Mar 31.00 1.95 0.19 1.75 1.75 151.00 85.54% 2,223 1,653,709 1,653,709 82

Apr 30.00 1.98 0.19 1.78 1.78 151.00 85.54% 2,260 813,427 813,427 1,626,853 81

May 31.00 2.63 0.19 2.43 2.43 151.00 85.54% 3,084 2,294,156 2,294,156 114

Jun 30.00 8.25 0.19 8.06 7.50 151.00 85.54% 9,500 6,840,000 6,840,000 342

July 31.00 25.42 0.19 25.23 7.50 151.00 85.54% 9,500 7,068,000 7,068,000 353

Aug 31.00 30.60 0.19 30.41 7.50 151.00 85.54% 9,500 7,068,000 7,068,000 353

Sept 30.00 23.27 0.19 23.07 7.50 151.00 85.54% 9,500 6,840,000 6,840,000 342

Oct 31.00 10.38 0.19 10.18 7.50 151.00 85.54% 9,500 7,068,000 7,068,000 353

Nov 30.00 4.29 0.19 4.10 4.10 151.00 85.54% 5,194 3,739,578 3,739,578 186

Dec 31.00 2.84 0.19 2.65 2.65 151.00 85.54% 3,352 1,247,106 1,247,106 2,494,211 124

365.00 9.70 Total 7,622,586 42,978,266 50,600,852 2,530

Plant FaDry season energy

Wet season energy

POWER AND ENERGY GENERATION

Sorun Khola Hydropow er Project

7,241,457

40,829,352

Design discharge, m3/s

D/s release, m3/s

Total Annual Energy 48,070,809

Gross Head,m

Outage and Losses



Summary of Flows by various Method

SN Month

WECS

Method

MHSP

Method MIP Method

Adopted

Average Flow

1 2 3 4 5 6

1 January 1.76 2.19 1.75 1.90

2 February 1.50 1.79 1.32 1.54

3 March 1.34 1.64 1.04 1.34

4 April 1.36 1.97 0.78 1.37

5 May 1.81 1.38 0.94 1.38

6 June 5.69 6.29 5.66 5.88

7 July 17.53 17.59 14.16 16.43

8 August 21.11 21.39 21.25 21.25

9 September 16.05 16.77 15.73 16.18

10 October 7.16 8.06 7.08 7.43

11 November 2.96 3.91 4.41 3.76

12 December 1.96 2.54 2.36 2.29

Adopted Flow = Average of (1,2,3)

Time Exceedence of Monthly Discharges at weir site

N Month Month

%

exceedence

Flow in the

river (cumec)

%

exceedenc

e

Reparian Flow

(cumec)

Flow Available

for Diversion

(Cumec)

1 8 August 8% 20.30 8% 0.12 20.18

2 7 July 17% 15.66 17% 0.12 15.54

3 9 September 25% 15.52 25% 0.12 15.40

4 10 October 33% 7.07 33% 0.12 6.95

5 6 June 42% 5.53 42% 0.12 5.41

6 11 November 50% 3.65 50% 0.12 3.53

7 12 December 58% 2.20 58% 0.12 2.08

8 1 January 67% 1.68 67% 0.12 1.56

9 2 February 75% 1.36 75% 0.12 1.24

10 5 May 83% 1.18 83% 0.12 1.06

11 3 March 92% 1.17 92% 0.12 1.05

12 4 April 100% 1.17 100% 0.12 1.05

5.84 cumecs

5.72 cumecs

5.72 cumecs

Flow in the river with 40% exceedence

Flow available for diversion with 40% exceedence

Flow to be diverted



-

5.00

10.00

15.00

20.00

25.00

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

Flow Duration Curve

Flow Duration Curve



Flow Estimation Using WECS 1990 Method

Mean Flow at Weir Axis

Total Catchment Area 137.22 sqkm

Catchment Area Below 5000m 137.08 sqkm

Monsoon Index at Centroid 1,000 mm factor

Mean Monthly Flows 1.45

Jan 1.76 cum/s 2.552576486

Feb 1.50 cum/s 2.17482054

Mar 1.34 cum/s 1.949165134

Apr 1.36 cum/s 1.978202292

May 1.81 cum/s 2.628549266

Jun 5.69 cum/s 8.250738956Jul 17.53 cum/s 25.42447484

Aug 21.11 cum/s 30.60410761

Sep 16.05 cum/s 23.26732504

Oct 7.16 cum/s 10.3767693

Nov 2.96 cum/s 4.294079663

Dec 1.96 cum/s 2.840767579

-

5.00

10.00

15.00

20.00

25.00

M e a n F l o w

( c u m / s )

Months



Medium Hydropower Study Project (NEA 1997) Method


137.22 Km2

1,000 mm

Far Western

MHSP prediction equation constants for mean flow

Month C A1 A2

Jan 2.19 m3/s January 0.03117 0.8644 0

Feb 1.79 m3/s February 0.02417 0.8752 0

Mar 1.64 m3/s March 0.02053 0.8902 0

Apr 1.97 m3/s April 0.01783 0.9558 0

May 1.38 m3/s May 0.01193 0.9657 0

Jun 6.29 m3/s June 0.01135 0.9466 0

Jul 17.59 m3/s July 0.01641 0.9216 0

Aug 21.39 m3/s August 0.02592 0.9095 0

Sep 16.77 m3/s Septrmber 0.02206 0.8963 0

Oct 8.06 m3/s October 0.01504 0.8772 0

Nov 3.91 m3/s November 0.00792 0.8804 0

Dec 2.54 m3/s December 0.00538 0.8890 0

Mean monthly flow analysis

Catchment area

Mean monsoon precipitation

Region

0.00

5.00

10.00

15.00

20.00

25.00

M e a n F l o w

( c u m / s )

Months



Flow Estimation Using MIP Method for Correlation


Total Catchment Area 137.22 sqkm

MIP Region 2

Mean Monthly Flows

Jan 1.7451 cum/s

Feb 1.3244 cum/s

Mar 1.0362 cum/s

Apr 0.7791 cum/s

May 0.9427 cum/s

Jun 5.6639 cum/sJul 14.1637 cum/s

Aug 21.2455 cum/s

Sep 15.7296 cum/s

Oct 7.0818 cum/s

Nov 4.4070 cum/s

Dec 2.3606 cum/s

-

5.0000

10.0000

15.0000

20.0000

25.0000

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

M e a n F l o w

( c u m / s )

Months



Summary of Floods by Various MethodSn Return Period High Flood Value Adopted Design

MHSP WECS Flood

1 2 Q2 142.26 142.26

2 5 Q5 142.84 231.36 231.363 10 Q10 298.30 298.30

4 20 Q20 216.81 367.88 367.88

5 50 Q50 271.61 465.91 465.91

6 100 Q100 318.46 545.17 545.17

7 200 Q200 629.85 629.85

8 500 Q500 749.88 749.88

9 1000 Q1000 508.90

10 10000 Q10000 764.73

Method

545.17



Medium Hydropower Study Project (NEA 1997) Method

Inputs are

137.22 Km2

1,000 mm

western

Regression coefficients for regional analysis of flood peaks

Analysis of flood

Q5year 142.84 m3/s

Q20year 216.81 m3/s k b k b

Q50year 271.61 m3/s 5 2.0409 0.8632 1.6762

Q100year 318.46 m3/s 20 3.2895 0.8510 3.2303

Q1000year 508.90 m3/s 50 4.2570 0.8444 4.6090

Q10000year 764.73 m3/s 100 5.2225 0.8352 5.9865

1000 9.2270 0.8148 12.6603

10000 14.4580 0.8063 24.6431

Catchment area

Mean monsoon precipitation

Region

Return period

Regio

Western Cent



Birendranagar Water Supply and Sanitation Project

Estimation of Flood Discharge

River

Locat ion :

1) Water and Energy Commission Secretar ia t Method (WECS 1990 Method)

Catchment Area Below 3000m A = 137.08 Sqkm

Two Year Flood Q2 1.8767(A+1).

= 142.26 cum/s

Hundred Year Flood Q100 14.63(A+1)0.7342

= 545.17 cum/s

Standard Deviation of Natural Log s ln (Q100/Q2)/2.326 = 0.57758

Return

Periods

(T)

2 Q2 QR=exp(lnQ2+s*s) 142.26

5 Q5 QR=exp(lnQ2+s*s) 231.36

10 Q10 QR=exp(lnQ2+s*s) 298.30

20 Q20 QR=exp(lnQ2+s*s) 367.8850 Q50 QR=exp(lnQ2+s*s) 465.91

100 Q100 QR=exp(lnQ2+s*s) 545.17

200 Q200 QR=exp(lnQ2+s*s) 629.85

500 Q500 QR=exp(lnQ2+s*s) 749.88

2.054

2.326

2.576

2.878

Flood Flows (QR)

Standardiz

normal Varia

0.000

0.842

1.282

1.645



Rating Curve

Weir Axis

Depth Elevation A P R S n V Q

(m) (m) (sqm) (m) (m) (m/s)

(cum/s)

x1000

8.000 1199.845 198.540 49.120 4.0419 0.0595 0.0740 8.369 1.66

7.000 1198.845 156.770 42.890 3.6552 0.0595 0.0740 7.827 1.23

6.000 1197.845 124.010 33.470 3.7051 0.0595 0.0740 7.898 0.98

5.000 1196.845 95.190 30.650 3.1057 0.0595 0.0740 7.021 0.67

4.000 1195.845 68.170 27.890 2.4442 0.0595 0.0740 5.985 0.408

3.000 1194.845 43.570 23.740 1.8353 0.0595 0.0740 4.944 0.22

2.000 1193.845 23.150 18.610 1.2440 0.0595 0.0740 3.815 0.09

1.000 1192.845 7.850 12.380 0.6341 0.0595 0.0740 2.434 0.02

- 1191.845 0.00

1191

1192

1193

1194

1195

1196

1197

1198

1199

1200

1201

0.0 0.5 1.0 1.5 2.0

E l e v a t i o n ( m )

Discharge (cum/s x1000)

Rating Curve (Weir)



Rating Curve

Powerhouse Axis

Depth Elevation A P R S n V Q

(m) (m) (sqm) (m) (m) (m/s)

(cum/s)

x1000

4.000 550.215 1,394.580 414.340 3.3658 0.0097 0.0400 5.5299 7.71

3.000 549.215 985.180 411.660 2.3932 0.0097 0.0400 4.4053 4.34

2.000 548.215 577.100 408.980 1.4111 0.0097 0.0400 3.0976 1.79

1.000 547.215 182.090 339.630 0.5361 0.0097 0.0400 1.6250 0.30

- 546.215 0.00

546

547

548

549

550

551

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0

E l e v a t i o n ( m )

Discharge (cum/s x1000)

Rating Curve (Powerhouse)



River Hydrology(River Flow Calculation) WECS Method

Low Flow Calculation

Return

Period

(Years)

Duration

(Days)

Constant

(Coeffi-

cient)

Coeffi-cientof Indepen-

dent

Varibals

CatchmentArea below

5000m

(Sqkm)

Discharge

(m3 /sec)

Discharge

(lps)

Period (Days) Coefficeint f Independent Area (m3/s) (lps)

(Years) variable (Sqkm)

20 Monthly 0.03059 0.08284 137.22 1.009 1009

10 Monthly 0.07490 0.08480 137.22 1.149 1149

2 Monthly 0.09299 0.09269 137.22 1.399 1399



Prediction of Sediment

Himalayan Sediment Yield (HSY) Technique (Galay, 1987)

Yield (Specific)

SN Physiographic Zone Elevation

SpecificSediment Yield

(ton/km2/year Area sqkm Zsy

1 High Himalayas Above 6000m 500 4.21 2105

2 High Mountain 3500-6000 2500 145 362500

3 Middle Mountain 1000-3500 5000 444.86 2224300

4 Siwalik 500-1000 7500 39 292500

Total Sediment yield,Sy 2881405

Total Sediment yield/sqkm 4551.479299 ton/sqkm/year

sorun hydrology

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