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The Water Framework Directive (Priority Substances and Classification) Regulations (Northern Ireland) 2011
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- Northern Ireland Statutory Rules
- 2011 No. 10
- SCHEDULE 1
- PART 2
- Environmental Standards for Lake...
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Environmental Standards for Lake Water Quality
Table 11
Standards for dissolved oxygen in lakes
| Status | Mean in July – August (mg/l) | |
|---|---|---|
| Salmonid | Cyprinid | |
| High | 9 | 8 |
| Good | 7 | 6 |
| Moderate | 4 | 4 |
| Poor | 1 | 1 |
| Bad | < 1 | < 1 |
Table 12
Salinity Standards for lakes with no natural saline influence
| Status | Proposed Boundary |
|---|---|
| Annual Mean (micro Siemens per centimetre) | |
| Good | 1000 |
Table 13
Total phosphorus standards for lakes
| Annual mean concentration of total phosphorous (µg/l) | ||||
|---|---|---|---|---|
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 |
| High | Good | Moderate | Poor | Bad |
| R ÷ H; or 5, whichever value is the larger value | R ÷ G; or 8, whichever is the larger value | (R ÷ G) ÷ 0.5 | (R ÷ G) ÷ 0.25 | > (R ÷ G) ÷ 0.25 |
Table 14
Type-specific total phosphorus standards for lakes where the standards specified in Table 13 above do not apply
| Annual mean concentration of total phosphorus (µg/l) | |||||
|---|---|---|---|---|---|
| Column 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 |
| Geological and depth category | High | Good | Moderate | Poor | Bad |
| High alkalinity; shallow | 16 | 23 | 46 | 92 | > 92 |
| High alkalinity; very shallow | 23 | 31 | 62 | 124 | > 124 |
| Moderate alkalinity; deep | 8 | 12 | 24 | 48 | > 48 |
| Moderate alkalinity; shallow | 11 | 16 | 32 | 64 | > 64 |
| Moderate alkalinity; very shallow | 15 | 22 | 44 | 88 | > 88 |
| Low alkalinity; deep | 5 | 8 | 16 | 32 | > 32 |
| Low alkalinity; shallow | 7 | 10 | 20 | 40 | > 40 |
| Low alkalinity; very shallow | 9 | 14 | 28 | 56 | > 56 |
| Marl; shallow | 9 | 20 | 40 | 80 | > 80 |
| Marl; very shallow | 10 | 24 | 48 | 96 | > 96 |
Table 15
Good environmental standards for lake water levels
| Good Lake Standards | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| percentage reduction in mean daily inflow | ||||||||||||||
| Column 1 | Col 2 | Col 3 | Col 4 | Col 5 | Col 6 | Col 7 | Col 8 | Col 9 | Col 10 | Col 11 | Col 12 | Col 13 | Col 14 | |
| Geology | Altitude | Low | Mid | High | ||||||||||
| Size | Small | Large | Small | Large | Small | Large | ||||||||
| Basin form | L | V | L | V | L | V | L | V | L | V | L | V | ||
| Depth | ||||||||||||||
| Peat | Summer | Deep | 15 | 15 | 15 | 10 | 15 | 15 | 15 | 10 | 15 | 15 | 15 | 10 |
| Shallow | 15 | 10 | 10 | 10 | 15 | 10 | 10 | 10 | 15 | 10 | 10 | 10 | ||
| Winter | Deep | 15 | 15 | 15 | 10 | 15 | 10 | 10 | 10 | 12 | 10 | 10 | 10 | |
| Shallow | 15 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 5 | ||
| Low Alkalinity | Summer | Deep | 30 | 25 | 25 | 25 | 30 | 25 | 25 | 25 | 30 | 25 | 25 | 25 |
| Shallow | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | ||
| Winter | Deep | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 15 | 20 | 15 | 15 | 15 | |
| Shallow | 20 | 20 | 20 | 15 | 20 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | ||
| Medium Alkalinity | Summer | Deep | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Shallow | 20 | 20 | 20 | 15 | 20 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | ||
| Winter | Deep | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 15 | 20 | 15 | 15 | 15 | |
| Shallow | 20 | 20 | 20 | 15 | 20 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | ||
| High Alkalinity, Marl | Summer | Deep | 30 | 25 | 25 | 25 | 30 | 25 | 25 | 25 | 30 | 25 | 25 | 25 |
| Shallow | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | ||
| Winter | Deep | 30 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | |
| Shallow | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 20 | ||
| Brackish | Summer | Deep | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Shallow | 20 | 20 | 20 | 15 | 20 | 20 | 20 | 15 | 20 | 20 | 20 | 15 | ||
| Winter | Deep | 30 | 25 | 25 | 25 | 30 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | |
| Shallow | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | ||
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