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(a)     reducing discharges from the storm overflows of sewerage undertakers whose area is wholly or mainly in England, and

(b)     reducing the adverse impacts of those discharges.

(a)     reducing the frequency and duration of the discharges, and

(b)     reducing the volume of the discharges.

(a)     reducing adverse impacts on the environment, and

(b)     reducing adverse impacts on public health.

(a)     reducing the need for anything to be discharged by the storm overflows;

(b)     treating sewage that is discharged by the storm overflows;

(c)     monitoring the quality of watercourses, bodies of water or water in underground strata into which the storm overflows discharge;

(d)     obtaining information about the operation of the storm overflows.