Karmakitta Tarni Deisgn Flood

7/29/2019 Karmakitta Tarni Deisgn Flood

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Karmakitta Tarni Rural Water Supply SchemeDraft DPR

Annexure VI.1

Particulars of the catchment

Name of Sub-zone

Name of tributary

River system

Shape of catchment Fan shaped

Location LatitudeLongitude

Topography Plain Areas

IA Equivalent Slope

S.NO

(km)

1 2 3 4 5 6 7

1 0.00 160 0.000 0

2 13.10 180 13.100 20 20 262.0

3 22.40 200 9.300 40 60 558.0

4 30.09 220 7.690 60 100 769.05 34.74 240 4.650 80 140 651.0

6 37.70 260 2.960 100 180 532.8

2772.8

S = 1.951

L 37 7 19 600 km

Karmakitta Tarni Rural Water Supply Scheme

Assessment of design flood for Karmakitta Tarni Scheme

(As per CWC Flood Estimation Report for Lower Ganga Plains Sub-Zone 1 (g)

Lower Ganga plains -1(g)

Mothihara

Mayurakshi

240

28' 10.83860 58' 37.72

The weir site is located on river Mothihara, tributary of river Mayurakshi in the Lower Ganga plains. Thesynthetic unit hydrograph for Mothihara river at the proposed weir site is derived based on the FloodEstimation Report for Lower Ganga Plains Subzone-1(g) (revised) published by Central Water Commission.

Synthetic Unit Hydrograph

Reduceddistance

Starting fromPoint of study

Reduced Levels Of RiverBed

Length OfEach

SegmentLi

Height AboveDatum *(DiDifference

Between Datum

and the with R.L

(Di-1

+Di)Li* (D

i-1+Di)

(4) x (6)

(kms) (m) (m) (m x km)

Li(Di-1+Di) =

Li(Di-1+Di)/L^2= m / km

km Lc


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Annexure VI.1

10 20.0

4 8.402 hours 11 24.0

12 29.0

5 4.674 hours 13 35.0

14 37.2

6 2.525 hours 15 37.1

16 36.7

7 82.294 hours 17 35.5

18 33.5

8 14.188 hours 19 31.0

Say 15.000 20 27.8

9 37.174 21 25.2

22 23.0

10 3066012 cum 23 21.0

Volume due to 1cm excess RF 3066600 cum 24 19.5

Ratio = 1.000 25 18.0

26 17.0

27 16.0

28 15.1

29 14.3

30 13.5

31 12.8

32 12.1

33 11.5

34 10.9

35 10.4

36 9.9

37 9.5

38 9.1

39 8.7

40 8.3

41 8.042 7.7

43 7.4

44 7.1

45 6.8

W75 = 0.8955(qp) -1.061

WR50 = 0.5524(qp) -1.012

WR75 = 0.2984(qp) -1.012

TB = 12.4755(tp)^0.721

Tm = tp + tr/2

Qp = qp x A cumecs

Vol Qi = A x d / tr x 0.36

2

4

6

8

10

1214

16

18

20

22

24

26

28

30

32

34

36

38

40


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Annexure VI.1

59 3.8

60 3.6

61 3.4

62 3.2

63 3.0

64 2.8

65 2.6

66 2.4

67 2.2

68 2.0

69 1.8

70 1.6

71 1.4

72 1.2

73 1.0

74 0.9

75 0.8

76 0.777 0.6

78 0.5

79 0.4

80 0.3

81 0.2

82 0.0

Sum 851.67


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Annexure VI.1

I Design storm (50 year return storm)

A Storm duration (TD)

The design storm duration is adopted as 1.1 times tp = 1.1 *13.5 = 14.85

Rounding it to the nearest hour TD= 15

B Point Rainfall

C TD (15hr) rainfall

Conversion factor of 0.860 is taken from fig.10 to convert 24 hr rainfall to 15 hr rainfall

206.4 mm

D Areal Rainfall

188.46 mm

E Temporal Distribution of Rainfall

Design loss rate of 2.7mm per hour is recommended in para 3.5 for the sub-zone -1 (g).

Excess rainfall (mm)

mm mm

1 0 28 52 77 52 8 50 07



(As per CWC Flood Estimation Report for Lower Ganga Plains Sub-Zone 1 (g)

hrs

hrs

The project is situated near Karmakitta Tarni Village in Jarmundi Block of Dumka District in Jharkhandstate

The 50 year 24 hour point rainfall for the catchment is 240 mm vide plate-9 of the Flood Estimation

Report for Lower Ganga Plains Sub-Zone 1 (g)

Thus the 15 hr rainfall =240*0.860mm =

The Areal to Point Rainfall % as per Fig 12b, annex-4.2 of the report is 91.31 for

306.66sqkm . Therefore the 50 year 15 hour areal 'Rainfall' for Karmakitta Tarniproject is 206.4*0.9131=

Using the distribution percentages given in Annexe 4.1 or fig-11, the 50 year 15hr areal rainfall is splitinto 1hr rainfall increments as below.

Duration(hours)

Distributioncoefficient

StormRainfall

Rainfallincrements Loss rate 2.7mm per

hour)


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Annexure VI.1

12 0.94 177.16 5.7 2.95

13 0.96 180.93 3.8 1.07

14 0.98 184.69 3.8 1.0715 1 188.46 3.8 1.07

Total 188.46 148.0


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Annexure VI.1

UG Rainfall Rainfall

Time Ordinate mm mm

1 2.0

2 3.0

3 4.5

4 6.0

5 7.5

6 9.0

7 11.0

8 13.5

9 16.510 20.0 1.07 1.0692768

11 24.0 2.95 1.0692768

12 29.0 2.95 2.9539152

13 35.0 8.61 2.9539152

14 37.2 50.07 2.9539152

15 37.1 27.45 6.723192

16 36.7 19.91566 6.723192

17 35.5 10.49247 10.4924688

18 33.5 6.723192 19.9156608

19 31.0 6.723192 27.4542144

20 27.8 2.953915 50.0698752

21 25.2 2.953915 8.6078304

22 23.0 2.953915 2.9539152

23 21.0 1.069277 2.9539152

24 19.5 1.069277 1.0692768

25 18 0

Critical Sequencing of ExcessRainfall increments

Reversingthe

sequence


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Annexure VI.1

35 10.4

36 9.9

37 9.538 9.1

39 8.7

40 8.3

41 8.0

42 7.7

43 7.444 7.1

45 6.8

46 6.5

47 6.2

48 6.0

49 5.850 5.6

51 5.4

52 5.2

53 5.0

54 4.8

55 4.656 4.4

57 4.2

58 4.0

59 3.8

60 3.6

61 3.4

62 3.2

63 3.0

64 2.8

65 2.6


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Annexure VI.1

76 0.7

77 0.6

78 0.579 0.4

80 0.3

81 0.2

82 0.0


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Karmakitta Tarni Rural Water Supply SchemeDraft DP

Annexure VI.1

DW&S DepartmentGovt. of Jharkhand

9aarvee associates architects

engineers consultants pvt. Ltd.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

mm /cm 1.06928 1.06928 2.95392 2.9539 2.9539 6.723192 6.7232 10.49247 19.91566 27.45421 50.07 8.60783 2.9539152 2.95392 1.06928

DRH

Time Ordinate 0.11 0.11 0.30 0.30 0.30 0.67 0.67 1.05 1.99 2.75 5.01 0.86 0.30 0.30 0.11

0.0 0 0 15.3 15.3

1 2.0 0.2 0 15.3 15.5

2 3.0 0.3 0.2 1 15.3 15.9

3 4.5 0.5 0.3 0.6 1 15.3 16.7

4 6.0 0.6 0.5 0.9 0.6 3 15.3 17.9

5 7.5 0.8 0.6 1.3 0.9 0.6 4 15.3 19.6

6 9.0 1.0 0.8 1.8 1.3 0.9 1.3 7 15.3 22.4

7 11.0 1.2 1.0 2.2 1.8 1.3 2.0 1.3 11 15.3 26.2

8 13.5 1.4 1.2 2.7 2.2 1.8 3.0 2.0 2.1 16 15.3 31.7

9 16.5 1.8 1.4 3.2 2.7 2.2 4.0 3.0 3.1 4.0 26 15.3 40.9

10 20.0 2.1 1.8 4.0 3.2 2.7 5.0 4.0 4.7 6.0 5.5 39 15.3 54.4

11 24.0 2.6 2.1 4.9 4.0 3.2 6.1 5.0 6.3 9.0 8.2 10.0 61 15.3 76.7

12 29.0 3.1 2.6 5.9 4.9 4.0 7.4 6.1 7.9 11.9 12.4 15.0 1.7 83 15.3 98.1

13 35.0 3.7 3.1 7.1 5.9 4.9 9.1 7.4 9.4 14.9 16.5 22.5 2.6 0.6 108 15.3 123.1

14 37.2 4.0 3.7 8.6 7.1 5.9 11.1 9.1 11.5 17.9 20.6 30.0 3.9 0.9 0.6 135 15.3 150.215 37.1 4.0 4.0 10.3 8.6 7.1 13.4 11.1 14.2 21.9 24.7 37.6 5.2 1.3 0.9 0.2 164 15.3 179.7

16 36.7 3.9 4.0 11.0 10.3 8.6 16.1 13.4 17.3 26.9 30.2 45.1 6.5 1.8 1.3 0.3 197 15.3 212.0

17 35.5 3.8 3.9 11.0 11.0 10.3 19.5 16.1 21.0 32.9 37.1 55.1 7.7 2.2 1.8 0.5 234 15.3 249.2

18 33.5 3.6 3.8 10.8 11.0 11.0 23.5 19.5 25.2 39.8 45.3 67.6 9.5 2.7 2.2 0.6 276 15.3 291.4

19 31.0 3.3 3.6 10.5 10.8 11.0 25.0 23.5 30.4 47.8 54.9 82.6 11.6 3.2 2.7 0.8 322 15.3 337.1

20 27.8 3.0 3.3 9.9 10.5 10.8 24.9 25.0 36.7 57.8 65.9 100.1 14.2 4.0 3.2 1.0 370 15.3 385.7

21 25.2 2.7 3.0 9.2 9.9 10.5 24.7 24.9 39.0 69.7 79.6 120.2 17.2 4.9 4.0 1.2 421 15.3 435.9

22 23.0 2.5 2.7 8.2 9.2 9.9 23.9 24.7 38.9 74.0 96.1 145.2 20.7 5.9 4.9 1.4 468 15.3 483.4

23 21.0 2.2 2.5 7.4 8.2 9.2 22.5 23.9 38.5 73.9 102.0 175.2 25.0 7.1 5.9 1.8 505 15.3 520.724 19.5 2.1 2.2 6.8 7.4 8.2 20.8 22.5 37.2 73.1 101.9 186.1 30.1 8.6 7.1 2.1 516 15.3 531.7

25 18.0 1.9 2.1 6.2 6.8 7.4 18.7 20.8 35.1 70.7 100.8 185.8 32.0 10.3 8.6 2.6 510 15.3 525.1

26 17.0 1.8 1.9 5.8 6.2 6.8 16.9 18.7 32.5 66.7 97.5 183.8 31.9 11.0 10.3 3.1 495 15.3 510.3

27 16.0 1.7 1.8 5.3 5.8 6.2 15.5 16.9 29.2 61.7 92.0 177.7 31.6 11.0 11.0 3.7 471 15.3 486.4

28 15.1 1.6 1.7 5.0 5.3 5.8 14.1 15.5 26.4 55.4 85.1 167.7 30.6 10.8 11.0 4.0 440 15.3 455.3

29 14.3 1.5 1.6 4.7 5.0 5.3 13.1 14.1 24.1 50.2 76.3 155.2 28.8 10.5 10.8 4.0 405 15.3 420.8

30 13.5 1.4 1.5 4.5 4.7 5.0 12.1 13.1 22.0 45.8 69.2 139.2 26.7 9.9 10.5 3.9 370 15.3 384.9

31 12.8 1.4 1.4 4.2 4.5 4.7 11.4 12.1 20.5 41.8 63.1 126.2 23.9 9.2 9.9 3.8 338 15.3 353.5

32 12.1 1.3 1.4 4.0 4.2 4.5 10.8 11.4 18.9 38.8 57.7 115.2 21.7 8.2 9.2 3.6 311 15.3 326.033 11.5 1.2 1.3 3.8 4.0 4.2 10.2 10.8 17.8 35.8 53.5 105.1 19.8 7.4 8.2 3.3 287 15.3 301.9

34 10.9 1.2 1.2 3.6 3.8 4.0 9.6 10.2 16.8 33.9 49.4 97.6 18.1 6.8 7.4 3.0 266 15.3 281.8



Baseflow

(0.05cumec

/sq.km)

TotalHydrograph


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Karmakitta Tarni Rural Water Supply SchemeDraft DP

Annexure VI.1

DW&S DepartmentGovt. of Jharkhand

11aarvee associates architects

engineers consultants pvt. Ltd.

80 0.3 0.0 0.0 0.1 0.2 0.2 0.5 0.6 1.0 2.4 3.8 8.0 1.5 0.6 0.6 0.3 20 15.3 35.4

81 0.2 0.0 0.0 0.1 0.1 0.2 0.5 0.5 0.9 2.0 3.3 7.0 1.4 0.5 0.6 0.2 17 15.3 32.8

82 0.0 0.0 0.0 0.1 0.1 0.1 0.4 0.5 0.8 1.8 2.7 6.0 1.2 0.5 0.5 0.2 15 15.3 30.4

83 0.0 0.1 0.1 0.1 0.3 0.4 0.7 1.6 2.5 5.0 1.0 0.4 0.5 0.2 13 15.3 28.3

84 0.0 0.1 0.1 0.3 0.3 0.6 1.4 2.2 4.5 0.9 0.4 0.4 0.2 11 15.3 26.6

85 0.0 0.1 0.2 0.3 0.5 1.2 1.9 4.0 0.8 0.3 0.4 0.1 10 15.3 25.186 0.0 0.1 0.2 0.4 1.0 1.6 3.5 0.7 0.3 0.3 0.1 8 15.3 23.6

87 0.0 0.1 0.3 0.8 1.4 3.0 0.6 0.2 0.3 0.1 7 15.3 22.2

88 0.0 0.2 0.6 1.1 2.5 0.5 0.2 0.2 0.1 5 15.3 20.8

89 0.0 0.4 0.8 2.0 0.4 0.2 0.2 0.1 4 15.3 19.5

90 0.0 0.5 1.5 0.3 0.1 0.2 0.1 3 15.3 18.1

91 0.0 1.0 0.3 0.1 0.1 0.1 2 15.3 16.9

92 0.0 0.2 0.1 0.1 0.1 0 15.3 15.8

93 0.0 0.1 0.1 0.0 0 15.3 15.5

94 0.0 0.1 0.0 0 15.3 15.4

0.0 0.0 0 15.3 15.4

0.0 0 15.3 15.3

1 2 3 4 5 6 7 8 910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394

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Rural Water Supply Project

Karmakitta Tarni-50 year return flood

Time in hours

Discha

rge9cumec)

Documents

Karmakitta Tarni Deisgn Flood