2. In order to determine how to classify surface water bodies designated as heavily modified or artificial in accordance with paragraph 1, the Department must —
(a)determine whether or not all practicable mitigation has been taken to improve the modified or artificial hydromorphological characteristics of the surface water body other than that which would have a significant adverse impact on:
(i)the use served by the modified or artificial characteristics; or
(ii)the wider environment.
(b)estimate representative values of indicators of the condition of the relevant biological and physicochemical quality elements from monitoring or modelling results. The indicators shall include:
(i)indicators of the biological quality elements which are not sensitive to the artificial or heavily modified characteristics of the water body;
(ii)the concentrations of those specific pollutants likely to be in the surface water body in quantities that could cause a failure of a specific pollutant standard; and
(iii)the values for those other physicochemical quality elements at risk of being so altered as to be failing a physicochemical standard.
(c)compare the values of the indicators estimated from monitoring or modelling with the applicable standards in Schedule 1 of these Regulations.