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- Point in Time (23/10/2015)
- Original (As made)
Point in time view as at 23/10/2015.
There are currently no known outstanding effects for the The Water Framework Directive (Classification, Priority Substances and Shellfish Waters) Regulations (Northern Ireland) 2015, Environmental Standards for River Water Quality.
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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 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 |
Type1 | High | Good | Moderate | Poor | Bad |
Upland and low alkalinity | 80 | 75 | 64 | 50 | < 50 |
Lowland and high alkalinity | 70 | 60 | 54 | 45 | < 45 |
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 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 |
Type | High | Good | Moderate | Poor | Bad |
Upland and low alkalinity | 0.2 | 0.3 | 0.75 | 1.1 | > 1.1 |
Lowland and high alkalinity | 0.3 | 0.6 | 1.1 | 2.5 | > 2.5 |
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 1 | Column 2 | Column 3 | Column 4 | Column 5 | Column 6 |
Type2 | High | Good | Moderate | Poor | Bad |
Upland and low alkalinity | 3 | 4 | 6 | 7.5 | > 7.5 |
Lowland and high alkalinity | 4 | 5 | 6.5 | 9 | > 9 |
Temperature (◦C) as an annual 98th percentile standard | ||||
---|---|---|---|---|
Column 1 | Column 2 | Column 3 | Column 4 | Column 5 |
Type | High | Good | Moderate | Poor |
Salmonid waters | 20 | 23 | 28 | 30 |
Cyprinid waters | 25 | 28 | 30 | 32 |
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 waters1 | Humic waters2 | |||
---|---|---|---|---|
Column 1 | Column 2 | Column 3 | Column 4 | Column 5 |
Annual mean | ||||
pH | ANC3 | pH | ANC3 | |
High | 6.604 | 80 | 5.104 | 80 |
Good | 5.95 | 40 | 4.55 | 50 |
Moderate | 5.44 | 15 | 4.22 | 10 |
Poor | 4.89 | -10 | 4.03 | 5 |
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 1 | Column 2 | Column 3 |
Maximum permitted % abstraction at Q exceeding Q952 | Maximum permitted % abstraction at Q not exceeding Q95 | |
A1, A2 (downstream), A2 (headwaters), B1, B2, C2, D2 | 10 | 5 |
Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | ||||
---|---|---|---|---|
Good | ||||
Column 1 | Column 2 | Column 3 | Column 4 | Column 5 |
River type | Maximum % abstraction at Q exceeding Q60 | Maximum % abstraction at Q exceeding Q70 | Maximum % abstraction at Q exceeding Q95 | Maximum % abstraction at Q not exceeding Q95 |
A1 | 35 | 30 | 25 | 20 |
A2 (downstream), B1, B2 | 30 | 25 | 20 | 15 |
A2 (headwaters), C2, D2 | 25 | 20 | 15 | 10 |
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 1 | Column 2 | Column 3 | Column 4 | Column 5 |
River type | Maximum % abstraction at Q exceeding Q60 | Maximum % abstraction at Q exceeding Q70 | Maximum % abstraction at Q exceeding Q95 | Maximum % abstraction at Q not exceeding Q95 |
A1 | 70 | 50-701 | 50 | 45 |
A2 (downstream), B1, B2, | 70 | 45-701 | 45 | 40 |
A2 (headwaters), C2, D2 | 70 | 40-701 | 40 | 35 |
Permitted abstraction per day as a percentage of the natural mean daily flow(Q) | ||||
---|---|---|---|---|
Poor | ||||
Column 1 | Column 2 | Column 3 | Column 4 | Column 5 |
River type | Maximum % abstraction at Q exceeding Q60 | Maximum % abstraction at Q exceeding Q90 | Maximum % abstraction at Q exceeding Q95 | Maximum % abstraction at Q not exceeding Q95 |
A1 | Qx less 25% of Q90 | Qx less 25% of Q90 | 75 | 70 |
A2 (downstream), B1, B2, | Qx less 30% of Q90 | Qx less 30% of Q90 | 70 | 65 |
A2 (headwaters), C2, D2 | Qx less 35% of Q90 | Qx less 35% of Q90 | 65 | 60 |
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