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TABLE 1

TRANSMISSIVITY DISTRIBUTION   IN THE TUCSON BASIN AQUIFER

TRANSMISSIVITY
(gpd/ft)

CUMULATIVE  
PROBABILITY (%)

PROBABILITY OF FINDING TRANSMISSIVITY VALUE AT RANDOM
(%)

CALCULATED NUMBER OF NODES
(E)

ACTUAL NUMBER OF NODES
(0)

5

8.71

91.29

218

157

10

16.67

83.33

416

431

20

30.56

69.44

763

804

30

42.13

57.87

1052

1222

40

51.78

48.22

1293

1444

 (Mean 54.848)   50

59.81

40.19

1494

1621

70

72.09

27.91

1800

1808

90

80.62

19.38

2013

2088

100

83.85

16.15

2094

2174

110

86.54

13.46

2161

2211

150

93.51

6.49

2335

2336

200

97.39

2.61

2432

2379

250

98.95

1.05

2471

2470

300

99.58

0.42

2487

2487

350

99.83

0.17

2493

2495

400

99.93

0.07

2495

2496

450

99.97

0.03

2496

2497

 

KEY
> 75.1% Chance of finding transmissivity greater than X.
50.1% to 75.0% chance
25.1% to 50.0% chance
2.49% to 25% chance 
< 2.49% chance of Finding at Random

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