| Table 5.17 Annual average concentrations of selected determinands of river quality, by river location 1996 |
| | | | | | | | | | | Annual average |
| | | | | | | Determinands |
| River | | Instantaneous | PH | BOD | | Nitrate | Dissolved | | Ammoniacal | Suspended |
| | | | flow | (ph units) | (mg/IO) | | (mg/IN) | oxygen | | nitrogen1 | solids |
| | | | (m3/sec) | | | | | | (mg/IO) | | (mg/IN) | (mg/I) |
| Clyde | | 47.5 | 7.5 | 3.9 | | 2.0 | 8.5 | | 1.4 | 33.8 |
| Forth2 | | 36.0 | 7.0 | 1.7 | | 0.8 | 10.4 | | 0.10 | 5.9 |
| Lochy | | 46.9 | 6.6 | 1.0 | | 0.1 | 11.5 | | 0 | 1.3 |
| Nith | | 40.2 | 7.7 | 2.4 | | 1.6 | 12.4 | | 0.10 | 4.5 |
| Spey | | 80.5 | 7.4 | 1.0 | | 0.4 | 12.6 | | 0 | 20.3 |
| Tay | | 176.8 | 7.8 | 1.2 | | 1.0 | 11.8 | | 0.10 | 2.7 |
| Tweed | | - | 8.1 | 1.5 | | 2.0 | 11.3 | | 0 | 10.7 |
| | | | | | | | | Source: DETR: Environment Information Management |
| - = Figures not available. |
| 1 In calculating averages, all values below detection, are taken as zero. |
| 2 Average daily mean flow was measured. |
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