Table 5.2 Summary
of Water Quality Monitoring Data for Tributaries of Mui Wo River in 2002
|
Parameter |
Unit |
Sampling Station |
||
|
MW1 |
MW2 |
MW4 |
||
|
Dissolved oxygen |
mg/L |
8.5 (7.6 – 11.4) |
9.2 (6.8 – 10.9) |
8.2 (6.0 – 10.6) |
|
pH |
|
7.1 (6.7 – 7.9) |
7.6 (7.2 – 8.0) |
7.2 (6.7 – 8.0) |
|
Suspended solids |
mg/L |
2 (1 – 4) |
5 (4 – 13) |
9 (3 – 15) |
|
5-day
Biochemical Oxygen Demand |
mg/L |
1 (1 – 3) |
3 (1 – 5) |
1 (1 – 3) |
|
Chemical Oxygen Demand |
mg/L |
3 (2 – 12) |
11 (2 – 15) |
10 (2 – 14) |
|
Oil & grease |
mg/L |
0.5 (0.5 – 0.6) |
0.5 (0.5 – 0.6) |
0.5 (0.5 – 0.5) |
|
Faecal coliforms |
cfu/100mL |
6,300 (500 – 39,000) |
24,000 (2,300 – 440,000) |
3,700 (490 – 16,000) |
|
E.coli |
cfu/100mL |
1,600 (180 – 22,000) |
4,800 (520 – 87,000) |
980 (160 – 6,300) |
|
Ammonia-nitrogen |
mg/L |
0.04 (0.01 – 0.54) |
0.48 (0.03 – 1.80) |
0.15 (0.08 – 0.26) |
|
Nitrate-nitrogen |
mg/L |
0.23 (0.14 – 0.43) |
0.14 (0.07 – 0.25) |
0.15 (0.06 – 0.43) |
|
Total Kjeldahl nitrogen,
SP |
mg/L |
0.15 (0.07 – 0.79) |
0.71 (0.15 – 2.20) |
0.32 (0.18 – 0.49) |
|
Ortho-phosphate |
mg/L |
0.11 (0.03 – 0.25) |
0.11 (0.04 – 0.26) |
0.04 (0.02 – 0.16) |
|
Total phosphorus, SP |
mg/L |
0.15 (0.04 – 0.27) |
0.18 (0.07 – 0.39) |
0.09 (0.07 – 0.24) |
|
Sulphide, SP |
mg/L |
0.02 (0.02 – 0.02) |
0.02 (0.02 – 0.02) |
0.02 (0.02 – 0.02) |
|
Flow |
L/s |
31 (3 – 621) |
NM |
216 (40 – 1,014) |
Notes:
1.
Data presented are in
annual medians of monthly samples, except those for faecal coliforms and E.coli
which are in annual geometric means.
2.
Figures
in brackets are annual ranges.
3.
SP
– soluble and particulate fractions (i.e. total value).
4.
NM
indicates no measurement taken