Table 2 Comparison of hydraulic alterations in extreme flow conditions (Groups 2 and 3) at the two stations for the pre-impact, RI impact and CI impact.

From: Quantitative Assessment of Hydrological Alteration Caused by Irrigation Projects in the Tarim River basin, China

Indicators

The Alar station

The Xinquman station

Pre-impact

RI impact

CI impact

Pre-impact

RI impact

CI impact

M

M

P (%)

D (%)

M

P (%)

D (%)

M

M

P (%)

D (%)

M

P (%)

D (%)

1-day minimum

5.3

6.0

13

49

11.7

120

100

2.0

2.6

33

43

2.4

22

39

3-day minimum

5.4

6.0

10

39

12.0

120

74

2.0

2.7

36

29

2.5

25

27

7-day minimum

5.5

6.2

13

24

12.2

124

87

2.1

2.8

34

29

2.6

22

15

30-day minimum

9.3

7.6

−18

39

16.6

79

100

4.5

5.1

13

71

5.1

13

34

90-day minimum

30.5

13.9

−55

7

23.5

−23

69

18.1

10.2

−44

14

8.7

−52

3

1-day maximum

1090

1330

22

24

1170

7

17

1020

863.0

−15

14

969.5

−5

64

3-day maximum

1013

1267

25

24

1047

3

4

1008

821.3

−19

0

897.4

−11

27

7-day maximum

944.1

1123

19

8

962

2

9

832.1

765.7

−8

0

841.1

1

3

30-day maximum

726.0

773

6

85

669

−8

61

603.2

566.2

−6

29

592.9

−2

3

90-day maximum

446.8

430.4

−4

69

425.3

−5

87

400.3

342.1

−15

43

357.4

−11

64

Base flow index

0.032

0.051

60

7

0.102

218

100

0.016

0.024

55

43

0.02

57

3

Julian date of minimum

143

163

14

24

184

29

48

159

176

11

71

148

−7

88

Julian date of maximum

226

220

−3

39

217

−4

9

226

222

−2

14

218

−4

27

  1. Note: M for median value, P for deviation degree estimated using Equation (1), D for degree of hydrological alteration estimated with Equation (2), RI for Reservoir irrigation, and CI for Channel irrigation.
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