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

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7.  To determine the morphological conditions applicable to a lake or any part thereof, the Department must assign the hydromorphological characteristics of the lake or part thereof as being of the type specified in column 1 of Table 9 below which corresponds to the applicable measurements specified in columns 3 and 4 of that Table.

Table 1

Criteria for identifying the types of river to which the dissolved oxygen, ammonia and biochemical oxygen demand standards for rivers apply

Site AltitudeAlkalinity (as mg/l CaCO3)
Less than 1010 to 5050 to 100100 to 200Over 200
Under 80 metresType 1Type 2Type 3Type 5Type 7
Over 80 metresType 4Type 6

Table 2

Final typology for dissolved oxygen, ammonia and biochemical oxygen demand in rivers
Column 1Column 2
Upland and low alkalinityTypes (1+2), 4 and 6
Lowland and high alkalinityTypes 3, 5 and 7

Table 3

Criteria for identifying types of river to which morphological conditions apply

TypeCharacteristics
Bedrock channelNormally high altitudeChannel cuts down laterallyMay have waterfalls and/or cascadesBedrock substrate
Cascade Step PoolNormally high altitudeChannel cuts downBoth turbulent and tranquil flowsCobble and boulder substrate
Pool-riffle-glideNormally medium altitudeOften not confined within a valleySlightly meanderingPebble and cobble substrate
MeanderingNormally low altitudeFlow laminar and would naturally interact with floodplainMeanderingMore fines than other substrates

Table 4

Criteria for identifying types of river to which the river flow standards apply

Column 1Column 2Column 3Column 4
TypeStandard Average Annual Rainfall mm (period 1961-1990)Base Flow Index (BFI)Catchment area (km2)
A1< 810.5< 0.715Any
≥ 0.715≥ 251.8
A2< 810.5≥ 0.715< 251.8

≤ 100 (A2 headwaters)

> 100 (A2 downstream)

≥ 810.5 and < 1413≥ 0.7495Any

≤ 100 (A2 headwaters)

> 100 (A2 downstream)

B1≥ 810.5 and < 1155≥ 0.3615 and < 0.7495< 267.4
B2≥ 810.5 and < 1413≥ 0.3615 and < 0.7495< 267.4
C2≥ 1155 and < 1413≥ 0.3615 and < 0.7495< 267.4
≥ 1413≥ 0.3615≥ 32.33
D2≥ 1413≥ 0.3615< 32.33
≥ 810.5< 0.3615Any

Table 5

Geological categories to which total phosphorus, phytoplankton and phytobenthos standards for lakes apply

Geological categoryAnnual mean alkalinity (micro-equivalents per litre)
Low alkalinity< 200
Moderate alkalinity200 – 1000
High alkalinity> 1000
Marl

Table 6

Depth categories to which total phosphorus standards for lakes apply

Depth categoryMean depth (metres)
Very shallow< 3
Shallow3 – 15
Deep> 15

Table 7

Colour categories to which total phosphorus standards for lakes apply

Colour categoryPlatinum (mg/l)
Humic> 30
Non humic≤ 30

Table 8

Geological characteristics used to identify lake types to which lake level standards apply

Categories
Column 1Column 2
PeatNon-Peat
mean water colour ≥90 hazen units; ormean water colour <90 hazen units; or
≥75% of solid catchment area comprised of peat<75% of solid catchment area comprised of peat

Table 9

Hydromorphological characteristics used to identify lake types to which morphological conditions apply

Column 1Column 2Column 3Column 4
TypeLake-MImAS(1) codeMean DepthAlkalinity
(1)

Morphological Impact Assessment System

Low Alkalinity

Very Shallow

P/L-vS<4m< 20 mgl-1 CaCO3
Low Alkalinity Shallow/DeepP/L-ShD>4m< 20 mgl-1 CaCO3
Moderate Alkalinity Very ShallowMA-vS<4m20 – 100 mgl-1 CaCO3
Moderate Alkalinity Shallow/DeepMA-ShD>4m20 – 100 mgl-1 CaCO3
High Alkalinity Very ShallowHA/M-vS<4m> 100 mgl-1 CaCO3
High Alkalinity Shallow/DeepHA/M-ShD>4m> 100 mgl-1 CaCO3

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