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

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The Water Framework Directive (Classification, Priority Substances and Shellfish Waters) Regulations (Northern Ireland) 2015, Environmental Standards for River Water Quality is up to date with all changes known to be in force on or before 23 October 2019. There are changes that may be brought into force at a future date. Changes that have been made appear in the content and are referenced with annotations. Help about Changes to Legislation

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Environmental Standards for River Water QualityF1F2F3N.I.
Table 1
Standards for dissolved oxygen in rivers

1 Where a lowland, high alkalinity river is a salmonid water the standards for the upland, low alkalinity type will apply.

Dissolved oxygen (percent saturation)
(10-percentile)
Column 1Column 2Column 3Column 4Column 5Column 6
Type1HighGoodModeratePoorBad
Upland and low alkalinity80756450< 50
Lowland and high alkalinity70605445< 45
Table 2
Standards for ammonia in rivers

1 Note that Ammonia is a Specific Pollutant and considered as such for compliance. It is included in this section as it is commonly assessed alongside the other inorganic chemistry elements.

Total ammonia1 (mg/l)
(90-percentile)
Column 1Column 2Column 3Column 4Column 5Column 6
TypeHighGoodModeratePoorBad
Upland and low alkalinity0.20.30.751.1> 1.1
Lowland and high alkalinity0.30.61.12.5> 2.5
Table 3
Standards for Biochemical Oxygen Demand in rivers

1 The standard for Biochemical Oxygen Demand shall be used when deciding action to meet the standard for dissolved oxygen.

2 Where a lowland, high alkalinity river is a salmonid water the standards for the upland, low alkalinity type will apply.

Biochemical oxygen demand (mg/l)1
(90-percentile)
Column 1Column 2Column 3Column 4Column 5Column 6
Type2HighGoodModeratePoorBad
Upland and low alkalinity3467.5> 7.5
Lowland and high alkalinity456.59> 9
Table 4
Standards for temperature in rivers
Temperature (◦C) as an annual 98th percentile standard
Column 1Column 2Column 3Column 4Column 5
TypeHighGoodModeratePoor
Salmonid waters20232830
Cyprinid waters25283032
Table 5
Standards for acid conditions in rivers. Either pH or Acid Neutralising Capacity (ANC) or both may be used

1 Waters with a Dissolved Organic Carbon Value of 10mg/l or less

2 Waters with a Dissolved Organic Carbon Value of greater than 10mg/l

3 As assessed by the Cantrell method

4 A 95% upper limit of 9 also applies

Clear waters1Humic waters2
Column 1Column 2Column 3Column 4Column 5
Annual mean
pHANC3pHANC3
High6.604805.10480
Good5.95404.5550
Moderate5.44154.2210
Poor4.89-104.035
Table 6
High environmental standards for river flows

1 ‘Q’ is the mean daily flow for a specified period of time

2 ‘Qx’ is the Q that is expected to be exceeded by ‘x’ percent for a specified period of time

Permitted abstraction per day as a percentage of the natural mean daily flow(Q)1
High
Column 1Column 2Column 3
Maximum permitted % abstraction at Q exceeding Q952Maximum permitted % abstraction at Q not exceeding Q95
A1, A2 (downstream), A2 (headwaters), B1, B2, C2, D2105
Table 7
Good environmental standards for river flows
Permitted abstraction per day as a percentage of the natural mean daily flow(Q)
Good
Column 1Column 2Column 3Column 4Column 5
River typeMaximum % abstraction at Q exceeding Q60Maximum % abstraction at Q exceeding Q70Maximum % abstraction at Q exceeding Q95Maximum % abstraction at Q not exceeding Q95
A135302520
A2 (downstream), B1, B230252015
A2 (headwaters), C2, D225201510
Table 8
Moderate environmental standards for river flows

1 incremental increase in allowable take at flows <Q60 to ≥ Q90

Permitted abstraction per day as a percentage of the natural mean daily flow(Q)
Moderate
Column 1Column 2Column 3Column 4Column 5
River typeMaximum % abstraction at Q exceeding Q60Maximum % abstraction at Q exceeding Q70Maximum % abstraction at Q exceeding Q95Maximum % abstraction at Q not exceeding Q95
A17050-7015045
A2 (downstream), B1, B2,7045-7014540
A2 (headwaters), C2, D27040-7014035
Table 9
Poor environmental standards for river flows
Permitted abstraction per day as a percentage of the natural mean daily flow(Q)
Poor
Column 1Column 2Column 3Column 4Column 5
River typeMaximum % abstraction at Q exceeding Q60Maximum % abstraction at Q exceeding Q90Maximum % abstraction at Q exceeding Q95Maximum % abstraction at Q not exceeding Q95
A1Qx less 25% of Q90Qx less 25% of Q907570
A2 (downstream), B1, B2,Qx less 30% of Q90Qx less 30% of Q907065
A2 (headwaters), C2, D2Qx less 35% of Q90Qx less 35% of Q906560

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