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STATISTICS FOR GHANA
GEMS/WATER - STATISTICAL SUMMARY BY STATION 2002-01-24 PAGE 151
STATION - WEIJA LAKE ON DENSU RIVER STATION NO. 081001
COUNTRY - GHANA DEPTH(M) 10.5
LOCATION - OCT. 0 LAT. 05/33/33 LONG. 000/21/16 ELEVATION(M) 14.3
REGIONAL CENTRE - AFRA WATER TYPE LAKE
PERIOD REQUESTED FROM - 1991-01-01 TO 1993-12-31
PERIOD OF RECORD FROM - 1991-02-12 TO 1993-12-29
STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED
ELEC TEMP TRANS NO3NO2 NH3
COND
02041 02061 02076 07105 07555
us/cm deg C m mg/L N mg/L N
NO. OF L-FLAGGED VALUES 0 0 0 0 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 3 28 3 9 1
MEAN 307. 29.0 0.7 0.22 0.29
MINIMUM 25.5 0.08
DATE OF MINIMUM 1991-08-21 1993-08-26
10TH PERCENTILE 26.0
MEDIAN 29.0 0.14
90TH PERCENTILE 31.0
MAXIMUM 36.5 0.50
DATE OF MAXIMUM 1991-03-27 1993-09-29
STANDARD DEVIATION 2.3 0.16
O2 COD F ALK pH
DISS DISS TOTAL
08101 08301 09104 10102 10300
mg/L O2 mg/L O2 mg/L F mg/L pH UNITS
NO. OF L-FLAGGED VALUES 0 0 0 0 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 3 3 2 28 16
MEAN 8.5 3. 0.2 98.12 7.7
MINIMUM 36.00 7.1
DATE OF MINIMUM 1993-10-28 1992-11-27
10TH PERCENTILE 73.60 7.2
MEDIAN 100.40 7.6
90TH PERCENTILE 110.30 8.3
MAXIMUM 121.00 8.4
DATE OF MAXIMUM 1992-04-23 1991-04-24
STANDARD DEVIATION 19.10 0.4
pH SUSP SOL Na Mg Si
105 DEG DISS DISS REACTIVE
10301 10401 11103 12103 14101
pH UNITS mg/L mg/L Na mg/L Mg mg/LSiO2
NO. OF L-FLAGGED VALUES 0 0 0 0 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 12 18 3 24 28
MEAN 7.5 23. 46. 9. 7.76
MINIMUM 6.9 2. 1. 0.30
DATE OF MINIMUM 1993-10-28 1991-05-22 1993-11-30 1992-09-30
10TH PERCENTILE 6.9 6. 3. 1.58
MEDIAN 7.3 16. 10. 6.00
90TH PERCENTILE 8.3 47. 12. 14.20
MAXIMUM 8.3 57. 17. 35.00
DATE OF MAXIMUM 1993-12-29 1991-04-24 1991-04-24 1991-06-18
STANDARD DEVIATION 0.5 17. 4. 7.22
SULPHATE Cl K Ca Mn
DISS DISS DISS TOTAL
16302 17204 19103 20101 25004
mg/L SO4 mg/L Cl mg/L K mg/L Ca mg/L Mn
NO. OF L-FLAGGED VALUES 0 0 0 0 15
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 25 24 3 28 0
MEAN 13. 42. 6.7 17.243 0.10
MINIMUM 0. 20. 6.000 0.10
DATE OF MINIMUM 1993-02-25 1991-07-16 1993-11-30 1991-02-27
10TH PERCENTILE 3. 25. 12.600 0.10
MEDIAN 13. 43. 16.000 0.10
90TH PERCENTILE 19. 56. 22.560 0.10
MAXIMUM 22. 58. 43.000 0.10
DATE OF MAXIMUM 1992-09-30 1993-06-18 1991-05-22 1992-12-22
STANDARD DEVIATION 6. 11. 6.232 0.00
Mn Fe Fe Cu Zn
DISS TOTAL TOTAL DISS DISS
25104 26002 26004 29106 30104
mg/L Mn mg/L Fe mg/L Fe mg/L Cu mg/L Zn
NO. OF L-FLAGGED VALUES 0 7 0 3 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 7 8 10 0 3
MEAN 0.03 0.13 0.09 0.040 0.280
MINIMUM 0.00 0.10 0.00
DATE OF MINIMUM 1993-01-28 1991-02-27 1993-01-28
10TH PERCENTILE 0.10 0.00
MEDIAN 0.00 0.10 0.08
90TH PERCENTILE 0.15 0.15
MAXIMUM 0.10 0.50 0.35
DATE OF MAXIMUM 1993-06-18 1991-07-16 1993-06-18
STANDARD DEVIATION 0.05 0.10 0.11
COLIFORM FAEC COL Cd Pb
TOTAL DISS DISS
36001 36011 48101 82101
No/100ml No/100ml mg/L Cd mg/L Pb
NO. OF L-FLAGGED VALUES 0 0 3 2
NO. OF G-FLAGGED VALUES 5 3 0 0
NO. OF UNFLAGGED VALUES 5 0 0 1
MEAN 303. 605. 0.014 0.041
MINIMUM 2.
DATE OF MINIMUM 1993-08-26
10TH PERCENTILE 2.
MEDIAN 95.
90TH PERCENTILE 550.
MAXIMUM 1800.
DATE OF MAXIMUM 1992-01-29
STANDARD DEVIATION 551.
STATION - PRA RIVER AT DABOASE STATION NO. 081002
COUNTRY - GHANA DEPTH(M) 3.6
LOCATION - OCT. 0 LAT. 05/06/36 LONG. 001/39/48 ELEVATION(M) 3.3
REGIONAL CENTRE - AFRA WATER TYPE RIVER
PERIOD REQUESTED FROM - 1991-01-01 TO 1993-12-31
PERIOD OF RECORD FROM - 1991-02-25 TO 1993-11-30
STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED
ELEC TEMP NO3NO2 NH3 O2
COND DISS
02041 02061 07105 07555 08101
us/cm deg C mg/L N mg/L N mg/L O2
NO. OF L-FLAGGED VALUES 0 0 0 0 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 8 30 26 24 5
MEAN 278. 27.0 9.29 0.62 7.7
MINIMUM 101. 23.0 3.80 0.00 6.8
DATE OF MINIMUM 1991-04-26 1991-11-20 1993-07-27 1991-04-25 1991-04-26
10TH PERCENTILE 25.0 5.30 0.00
MEDIAN 128. 26.8 8.65 0.00 7.7
90TH PERCENTILE 30.0 12.70 0.80
MAXIMUM 1272. 31.2 22.00 9.60 8.8
DATE OF MAXIMUM 1992-02-20 1992-04-16 1991-06-26 1992-01-27 1991-02-25
STANDARD DEVIATION 403. 2.0 3.63 1.94 0.8
ALK pH SUSP SOL Na Mg
TOTAL 105 DEG DISS DISS
10102 10300 10401 11103 12103
mg/L pH UNITS mg/L mg/L Na mg/L Mg
NO. OF L-FLAGGED VALUES 0 0 0 0 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 33 34 20 8 32
MEAN 55.09 7.2 66. 14. 6.
MINIMUM 15.00 6.5 10. 7. 0.
DATE OF MINIMUM 1993-06-22 1992-06-01 1991-03-21 1991-07-23 1992-01-27
10TH PERCENTILE 35.90 6.7 12. 1.
MEDIAN 50.00 7.1 59. 12. 4.
90TH PERCENTILE 78.50 7.4 110. 12.
MAXIMUM 100.00 7.9 180. 33. 43.
DATE OF MAXIMUM 1993-10-28 1993-08-31 1991-05-23 1992-02-20 1992-03-18
STANDARD DEVIATION 19.66 0.3 43. 8. 9.
Si SULPHATE Cl K Ca
REACTIVE DISS DISS DISS
14101 16303 17204 19103 20101
mg/LSiO2 mg/L SO4 mg/L Cl mg/L K mg/L Ca
NO. OF L-FLAGGED VALUES 0 23 0 0 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 28 0 27 7 31
MEAN 0.27 0. 21. 6.1 16.829
MINIMUM 0.00 0. 1. 2.9 2.100
DATE OF MINIMUM 1991-04-25 1991-02-25 1991-12-23 1991-10-21 1992-01-27
10TH PERCENTILE 0.00 0. 2. 8.420
MEDIAN 0.10 0. 13. 6.1 14.400
90TH PERCENTILE 0.55 0. 33. 26.720
MAXIMUM 1.60 0. 131. 11.7 41.000
DATE OF MAXIMUM 1992-08-17 1992-12-31 1993-02-26 1992-02-20 1991-05-23
STANDARD DEVIATION 0.38 0. 26. 2.9 8.794
Mn Fe Cu Zn As
TOTAL TOTAL TOTAL TOTAL TOTAL
25009 26002 29006 30004 33007
mg/L Mn mg/L Fe mg/L Cu mg/L Zn mg/L As
NO. OF L-FLAGGED VALUES 0 0 6 0 5
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 20 31 0 2 1
MEAN 0.00 1.84 0.040 0.055 0.428
MINIMUM 0.00 0.00 0.040 0.250
DATE OF MINIMUM 1991-05-23 1992-06-01 1991-07-23 1992-02-20
10TH PERCENTILE 0.00 0.20
MEDIAN 0.00 1.90 0.040 0.250
90TH PERCENTILE 0.00 3.49
MAXIMUM 0.00 4.30 0.040 0.800
DATE OF MAXIMUM 1992-12-31 1993-07-27 1992-06-27 1991-07-23
STANDARD DEVIATION 0.00 1.22 0.000 0.276
COLIFORM FAEC COL Cd Pb INST
TOTAL TOTAL TOTAL DISCHG
36001 36011 48001 82001 97160
No/100ml No/100ml mg/L Cd mg/L Pb m3/S
NO. OF L-FLAGGED VALUES 0 0 4 6 0
NO. OF G-FLAGGED VALUES 27 5 0 0 0
NO. OF UNFLAGGED VALUES 0 0 2 0 4
MEAN 18. 12. 0.037 0.067 50.7
MINIMUM 9. 2. 0.030 0.050 0.0
DATE OF MINIMUM 1993-04-29 1993-08-31 1992-02-20 1992-02-20 1993-01-29
10TH PERCENTILE 18.
MEDIAN 18. 16. 0.030 0.050 48.1
90TH PERCENTILE 18.
MAXIMUM 18. 16. 0.060 0.100 106.4
DATE OF MAXIMUM 1993-03-30 1993-11-30 1991-07-23 1991-10-21 1993-05-28
STANDARD DEVIATION 2. 6. 0.012 0.026 45.7
STATION - NAWUNI ON WHITE VOLTA RIVER STATION NO. 081003
COUNTRY - GHANA DEPTH(M) 2.8
LOCATION - OCT. 0 LAT. 09/41/21 LONG. 001/04/52 ELEVATION(M) 95.5
REGIONAL CENTRE - AFRA WATER TYPE RIVER
PERIOD REQUESTED FROM - 1991-01-01 TO 1993-12-31
PERIOD OF RECORD FROM - 1991-01-31 TO 1993-12-30
STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED
ELEC TEMP TRANS NO3NO2 NH3
COND
02041 02061 02076 07105 07555
us/cm deg C m mg/L N mg/L N
NO. OF L-FLAGGED VALUES 0 0 0 0 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 4 32 1 10 22
MEAN 83. 29.8 0.4 0.15 0.09
MINIMUM 64. 25.6 0.02 0.00
DATE OF MINIMUM 1991-09-26 1993-12-30 1993-03-25 1991-04-29
10TH PERCENTILE 26.0 0.02 0.00
MEDIAN 84. 30.0 0.07 0.00
90TH PERCENTILE 32.1 0.36 0.30
MAXIMUM 100. 34.0 0.43 0.70
DATE OF MAXIMUM 1993-11-30 1992-04-27 1993-09-30 1992-07-15
STANDARD DEVIATION 16. 2.3 0.16 0.20
O2 COD F ALK pH
DISS DISS TOTAL
08101 08301 09104 10102 10301
mg/L O2 mg/L O2 mg/L F mg/L pH UNITS
NO. OF L-FLAGGED VALUES 0 0 0 0 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 3 3 1 33 33
MEAN 6.5 2. 0.1 54.94 7.1
MINIMUM 25.00 6.0
DATE OF MINIMUM 1992-10-27 1991-04-29
10TH PERCENTILE 34.60 6.5
MEDIAN 53.00 7.0
90TH PERCENTILE 79.40 7.6
MAXIMUM 93.00 8.5
DATE OF MAXIMUM 1993-03-25 1991-02-23
STANDARD DEVIATION 18.40 0.5
SUSP SOL Na Mg Si SULPHATE
105 DEG DISS DISS REACTIVE
10401 11103 12103 14101 16302
mg/L mg/L Na mg/L Mg mg/LSiO2 mg/L SO4
NO. OF L-FLAGGED VALUES 0 0 0 0 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 16 3 33 33 24
MEAN 172. 9. 2. 0.98 21.
MINIMUM 45. 0. 0.10 0.
DATE OF MINIMUM 1993-11-30 1991-11-28 1991-08-26 1991-01-31
10TH PERCENTILE 48. 1. 0.20 3.
MEDIAN 152. 2. 0.50 15.
90TH PERCENTILE 358. 3. 2.00 41.
MAXIMUM 450. 6. 5.00 124.
DATE OF MAXIMUM 1992-09-30 1991-06-28 1991-06-28 1992-08-31
STANDARD DEVIATION 121. 1. 1.19 26.
Cl Cl K Ca Mn
DISS DISS DISS DISS TOTAL
17203 17204 19103 20101 25004
mg/L Cl mg/L Cl mg/L K mg/L Ca mg/L Mn
NO. OF L-FLAGGED VALUES 0 0 0 0 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 21 3 3 30 10
MEAN 18. 14. 4.3 5.033 0.01
MINIMUM 11. 2.400 0.00
DATE OF MINIMUM 1992-10-27 1991-05-23 1993-07-22
10TH PERCENTILE 12. 2.400 0.00
MEDIAN 18. 4.400 0.01
90TH PERCENTILE 22. 8.000 0.02
MAXIMUM 25. 10.800 0.02
DATE OF MAXIMUM 1991-08-26 1993-12-30 1993-06-30
STANDARD DEVIATION 4. 2.135 0.01
Mn Fe Fe Cu Zn
DISS TOTAL DISS DISS DISS
25104 26002 26102 29106 30104
mg/L Mn mg/L Fe mg/L Fe mg/L Cu mg/L Zn
NO. OF L-FLAGGED VALUES 0 0 0 3 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 2 25 2 0 3
MEAN 0.01 0.93 0.28 0.043 0.133
MINIMUM 0.20
DATE OF MINIMUM 1991-03-26
10TH PERCENTILE 0.24
MEDIAN 0.60
90TH PERCENTILE 1.35
MAXIMUM 6.60
DATE OF MAXIMUM 1992-08-31
STANDARD DEVIATION 1.32
COLIFORM FAEC COL Cd Pb INST
TOTAL DISS DISS DISCHG
36001 36011 48101 82101 97160
No/100ml No/100ml mg/L Cd mg/L Pb m3/S
NO. OF L-FLAGGED VALUES 0 3 3 3 0
NO. OF G-FLAGGED VALUES 11 25 0 0 0
NO. OF UNFLAGGED VALUES 0 0 0 0 9
MEAN 18. 16. 0.014 0.041 85.4
MINIMUM 16. 16. 3.1
DATE OF MINIMUM 1993-12-30 1991-01-31 1991-03-26
10TH PERCENTILE 16. 16.
MEDIAN 18. 16. 111.6
90TH PERCENTILE 18. 18.
MAXIMUM 18. 18. 143.6
DATE OF MAXIMUM 1993-10-27 1993-10-27 1991-10-26
STANDARD DEVIATION 1. 1. 61.9
STATION - KPONG RESERVOIR ON VOLTA RIVER STATION NO. 081004
COUNTRY - GHANA DEPTH(M) 0.0
LOCATION - OCT. 0 LAT. 06/10/22 LONG. 000/03/00 ELEVATION(M) 14.8
REGIONAL CENTRE - AFRA WATER TYPE LAKE
PERIOD REQUESTED FROM - 1991-01-01 TO 1993-12-31
PERIOD OF RECORD FROM - 1991-02-08 TO 1993-12-29
STATISTICS INCLUDE ALL FLAGGED DATA AS REPORTED
ELEC TEMP TRANS NO3NO2 O2
COND DISS
02041 02061 02076 07105 08101
us/cm deg C m mg/L N mg/L O2
NO. OF L-FLAGGED VALUES 0 0 0 0 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 3 28 3 12 3
MEAN 75. 28.2 1.9 0.66 5.3
MINIMUM 24.0 0.13
DATE OF MINIMUM 1993-01-28 1993-05-24
10TH PERCENTILE 26.0 0.13
MEDIAN 28.2 0.21
90TH PERCENTILE 29.5 0.69
MAXIMUM 31.0 5.00
DATE OF MAXIMUM 1993-11-30 1993-08-26
STANDARD DEVIATION 1.4 1.38
COD F ALK pH pH
DISS TOTAL
08301 09104 10102 10300 10301
mg/L O2 mg/L F mg/L pH UNITS pH UNITS
NO. OF L-FLAGGED VALUES 0 0 0 0 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 3 2 28 16 12
MEAN 3. 0.3 41.84 7.0 7.1
MINIMUM 31.00 6.9 6.9
DATE OF MINIMUM 1992-10-29 1991-02-27 1993-01-28
10TH PERCENTILE 34.00 6.9 6.9
MEDIAN 36.50 6.9 6.9
90TH PERCENTILE 43.90 7.1 7.9
MAXIMUM 111.00 7.1 8.3
DATE OF MAXIMUM 1993-10-28 1992-10-29 1993-11-30
STANDARD DEVIATION 18.17 0.1 0.5
SUSP SOL Na Mg Mg Si
105 DEG DISS DISS DISS REACTIVE
10401 11103 12102 12103 14101
mg/L mg/L Na mg/L Mg mg/L Mg mg/LSiO2
NO. OF L-FLAGGED VALUES 0 0 0 0 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 14 3 1 27 28
MEAN 10. 4. 1. 2. 10.36
MINIMUM 1. 0. 5.00
DATE OF MINIMUM 1991-03-27 1992-01-29 1993-03-30
10TH PERCENTILE 2. 1. 5.80
MEDIAN 8. 2. 9.00
90TH PERCENTILE 18. 4. 14.20
MAXIMUM 40. 8. 28.00
DATE OF MAXIMUM 1991-04-24 1993-10-28 1991-05-22
STANDARD DEVIATION 10. 2. 5.16
SULPHATE Cl K Ca Mn
DISS DISS DISS TOTAL
16302 17204 19103 20101 25004
mg/L SO4 mg/L Cl mg/L K mg/L Ca mg/L Mn
NO. OF L-FLAGGED VALUES 5 0 0 0 12
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 13 19 3 27 4
MEAN 2. 9. 3.6 6.637 0.12
MINIMUM 0. 4. 4.000 0.10
DATE OF MINIMUM 1993-03-30 1991-04-24 1992-02-24 1991-04-24
10TH PERCENTILE 0. 4. 4.000 0.10
MEDIAN 2. 6. 5.600 0.10
90TH PERCENTILE 5. 13. 8.720 0.20
MAXIMUM 10. 36. 17.200 0.25
DATE OF MAXIMUM 1992-01-29 1993-11-30 1993-11-30 1991-08-21
STANDARD DEVIATION 2. 9. 3.254 0.05
Mn Fe Fe Cu Zn
DISS TOTAL TOTAL DISS DISS
25104 26002 26004 29106 30104
mg/L Mn mg/L Fe mg/L Fe mg/L Cu mg/L Zn
NO. OF L-FLAGGED VALUES 0 13 0 2 0
NO. OF G-FLAGGED VALUES 0 0 0 0 0
NO. OF UNFLAGGED VALUES 3 3 4 1 3
MEAN 0.24 0.11 0.14 0.043 0.143
MINIMUM 0.10 0.05
DATE OF MINIMUM 1991-02-27 1993-07-16
10TH PERCENTILE 0.10
MEDIAN 0.10 0.15
90TH PERCENTILE 0.10
MAXIMUM 0.20 0.20
DATE OF MAXIMUM 1991-05-22 1993-06-18
STANDARD DEVIATION 0.02 0.07
COLIFORM FAEC COL Cd Pb
TOTAL DISS DISS
36001 36011 48101 82101
No/100ml No/100ml mg/L Cd mg/L Pb
NO. OF L-FLAGGED VALUES 0 0 3 3
NO. OF G-FLAGGED VALUES 6 1 0 0
NO. OF UNFLAGGED VALUES 4 0 0 0
MEAN 691. 0. 0.014 0.041
MINIMUM 2.
DATE OF MINIMUM 1993-01-28
10TH PERCENTILE 2.
MEDIAN 182.
90TH PERCENTILE 1800.
MAXIMUM 1800.
DATE OF MAXIMUM 1992-03-26
STANDARD DEVIATION 806.
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