Hyetograph IntensityDurationCurve DAD Curve

Hyetograph 90 80 70 Intensity (mm/h)

Bin Frequency 7.00 0 7.15 38 7.30 30 7.45 40 8.00 54 8.15 34 8.30 56 8.45 84 9.00 44 9.15 28 9.30 32 9.45 8 10.00 0 More 0

60 50 40 30 20 10 0 7.00

7.15

7.30

7.45

8.00

8.15

8.30

8.45

Time (hour)

yetograph

8.45 Time (hour)

9.00

9.15

9.30

9.45

10.00

More

time 7.00 7.15 7.30 7.45 8.00 8.15 8.30 8.45 9.00 9.15 9.30 9.45 10.00

cumulative rainfall (mm) rainfall in successive 15 min. intervals 0.0 9.5 9.5 17.0 7.5 27.0 10 40.5 13.5 49.0 8.5 63.0 14 84.0 21 95.0 11 102.0 7 110.0 8 112.0 2 112.0 0

Rainfall intensity in mm/h

Hyetograph 90 80 70 Rainfall intensity

38 30 40 54 34 56 84 44 28 32 8 0

60 50 40 30 20 10 0 time (hrs)

Frequency

Plot intensity duration curve for following given rainfall Time (hr) Cumulative Rainfall (mm) 7 7.15 7.3 7.45 8 8.15 8.3 8.45 9 9.15 9.3 9.45 10

0 9.5 17 27 40.5 49 63 84 95 102 110 112 112

Duration (min) Time (hr) Cumulative Rainfall (mm) 7.00 0 7.15 9.5 7.30 17 7.45 27 8.00 40.5 8.15 49 8.30 63 8.45 84 9.00 95 9.15 102 9.30 110 9.45 112 10.00 112 maximum rainfall (mm) maximum intensity (mm/h)

15 30 45 60 90 rainfall in any possible time interval equal to 15 min 30 min 45 min 60 min 90 min 9.5 7.5 10 13.5 8.5 14 21 11 7 8 2 0 21 84

17 17.5 27 23.5 31 22 32 22.5 36 35 43.5 32 46 18 39 15 26 10 17 2 10 35 46 70 61.33333

40.5 39.5 46 57 54.5 53 47 28 17 57 57

63 74.5 78 75 69.5 63 49 78 52

120 120 min

180 180 min

95 92.5 93 85 71.5 112 95 112 47.5 37.33333

Maximum intensity (mm/h)

Intensity duration curve 90 80 70 60 50 40 30 20 10 0 0

50

100 Duration (minutes)

duration curve

ration (minutes)

150

200

Cumulative rainfalls Time (hr) PZone I mm 2 4 6 8 10

PZone II mm 8 14 23 35 48

PZone III mm 5.45 10.55 18.28 27.9 40.1

2.4 7.2 12.39 20.89 29.81

Cumulative average rainfalls for progressively accumulated areas in (mm) PZone I

Time (hr) 2 4 6 8 10

PZone I+II 8 14 23 35 48

PZone I+II+III 5.54 10.67 18.44 28.14 40.36

4.01 8.98 15.49 24.61 35.22

Determine depths of rainfalls in 2h, 4h and 6h in zone-I Time (hr)

cumulative rainfall (cm) 0 2 4 6 8 10

Rainfall in (2h) 0 8 14 23 35 48

Rainfall in 4h 8 6 9 12 13

14 15 21 25

Determine depths of rainfalls in 2h, 4h and 6h in zone-II Time (hr)

cumulative rainfall (cm)

Rainfall in (2h)

Rainfall in 4h

0 2 4 6 8

0 5.54 10.67 18.44 28.14

5.54 5.13 7.77 9.70

10.67 12.90 17.47

10

40.36

12.23

21.93

Determine depths of rainfalls in 2h, 4h and 6h in zone-III

Determine depths of rainfalls in 2h, 4h and 6h in zone-III Time (hr)

cumulative rainfall (cm) 0 2 4 6 8 10

Rainfall in (2h) 0 4.01 8.98 15.49 24.61 35.22

4.01 4.97 6.51 9.12 10.62

Rainfall in 4h

8.98 11.48 15.63 19.73

Areas zone zone-I zone-II zone-III

2

Area (km )

2

cumulative Area (km )

100 2900 2850

100 3000 5850

Rainfall in 6h

23 27 34

maximum depths of rainfall for accumulated areas (mm) zone (I) 100 km2 Time (hr) 2 13 4 25 6 34

Rainfall in 6h

18.44 22.60 29.70

duration (hr) area (km2) cum.rainfall (mm) 100 3000

2 13 12.23

5850 Rainfall in 6h

10.62

Depth Area Duration curve 40 35 30 Depth (mm)

15.49 20.60 26.25

25 20 15 10 5 0 0

1000

2000

3000

4000

Area (km2

accumulated areas (mm) zone (I+II) 3000 km2 zone (I+II+III) 5850 km2 12.23 10.62 21.93 19.73 29.70 26.25 4 cum.rainfall (mm)

6 cum.rainfall (mm)

25 21.93

34 29.7

19.73

26.25

Area Duration curve

2 4 6

4000 Area

(km2)

5000

6000

7000