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The Water Framework Directive (Classification, Priority Substances and Shellfish Waters) Regulations (Northern Ireland) 2015

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Environmental Standards for Lake Water Quality

Table 10
Standards for dissolved oxygen in lakes
StatusMean in July – August (mg/l)
Salmonid watersCyprinid waters
High98
Good76
Moderate44
Poor11
Bad< 1< 1
Table 11
Salinity Standards for lakes with no natural saline influence
StatusProposed Boundary
Annual Mean (micro Siemens per centimetre)
Good1000
Table 12
Total phosphorus standards for lakes
Annual mean concentration of total phosphorous (µg/l)
Column 1Column 2Column 3Column 4Column 5
HighGoodModeratePoorBad
R ÷ H; or 5, whichever is the larger valueR ÷ G; or 8, whichever is the larger value(R ÷ G) ÷ 0.5(R ÷ G) ÷ 0.25> (R ÷ G) ÷ 0.25
Table 13
Type-specific total phosphorus standards for lakes where the standards specified in Table 12 above do not apply
Annual mean concentration of total phosphorus (µg/l)
Column 1Column 2Column 3Column 4Column 5Column 6
Geological and depth categoryHighGoodModeratePoorBad
High alkalinity; shallow16234692> 92
High alkalinity; very shallow233162124> 124
Moderate alkalinity; deep8122448> 48
Moderate alkalinity; shallow11163264> 64
Moderate alkalinity; very shallow15224488> 88
Low alkalinity; deep581632> 32
Low alkalinity; shallow7102040> 40
Low alkalinity; very shallow9142856> 56
Marl; shallow9204080> 80
Marl; very shallow10244896> 96
Table 14
Environmental standards for lake water levels
Daily maximum % reduction in the habitable zone lake surface area for 99% of the days in any year
(1)

The reference conditions lake surface area means the natural lake surface area in the absence of any abstractions, discharges or other man-made influences

Column 1Column 2Column 3Column 4
HighGoodModeratePoor
151020

The habitable zone lake surface is dependent on whether the lake is considered to have the geological sub-type “Peat” or “Non-Peat”.

The habitable zone lake surface area means the proportion of the reference conditions(1) lake surface area from the shore to a depth 5 metres deeper than the depth to which light penetration to the lake bed would be sufficient to enable the growth of rooted plants (macrophytes) or bottom-living algae.

In the absence of field data to the contrary, the depth to which light penetration to the lake bed is sufficient to enable the growth of rooted plants (macrophytes) or bottom-living algae may be taken to be 2 metres for lakes with the geological sub-type of “Peat” and 7 metres for “Non-Peat” lakes. The lake habitable zone extends 5m below the level of light penetration to account for impacts on the aphotic habitat.

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