1. The Department must determine the overall status of a surface water body, other than those designated as heavily modified or artificial, by combining the classification of ecological status and chemical status in one of the following and alternative ways:
(a)where the ecological and hydromorphological status of a surface water body is high and the chemical status of the surface water body is good, then the overall status of the surface water body is “high”.
(b)where the biological quality elements and the general chemical and physiochemical elements and specific pollutants are high and the chemical status is good but the hydromorphological status is less than high, then the overall status of the surface water body is “good”
(c)where the ecological status is good and the chemical status is good, then the overall status is “good”.
(d)where the ecological status is high, good or moderate, and the chemical status is failing to achieve good, then the overall status is “moderate”.
(e)where the ecological status is moderate and irrespective of chemical status, then the overall status is “moderate”.
(f)where the ecological status is poor or bad and irrespective of the chemical status, the overall status shall be the same classification as the ecological status, that is “poor” or “bad”.