14Waste water treatment plants
(1)The construction of a waste water treatment plant is a significant infrastructure project if—
(a)the treatment plant is in Wales or the Welsh marine area, and
(b)the treatment plant (when constructed) is expected to have a capacity exceeding a population equivalent of 500,000.
(2)The construction of infrastructure for the transfer or storage of waste water is a significant infrastructure project if—
(a)the infrastructure is in Wales or the Welsh marine area,
(b)the main purpose of the infrastructure is—
(i)the transfer of waste water for treatment, or
(ii)the storage of waste water prior to treatment,
or both, and
(c)the infrastructure is expected to have a capacity for the storage of waste water exceeding 350,000 cubic metres.
(3)The alteration of a waste water treatment plant is a significant infrastructure project if—
(a)the plant is in Wales or the Welsh marine area, and
(b)the effect of the alteration is expected to be to increase by more than a population equivalent of 500,000 the capacity of the plant.
(4)The alteration of infrastructure for the transfer or storage of waste water is a significant infrastructure project if—
(a)the infrastructure is in Wales or the Welsh marine area,
(b)the main purpose of the infrastructure is—
(i)the transfer of waste water for treatment, or
(ii)the storage of waste water prior to treatment,
or both, and
(c)the effect of the alteration is expected to be to increase the capacity of the infrastructure for the storage of waste water by more than 350,000 cubic metres.
(5)In this section, “waste water” includes domestic waste water, industrial waste water and urban waste water.
(6)The following terms used in this section have the meanings given by regulation 2(1) of the Urban Waste Water Treatment (England and Wales) Regulations 1994 (S.I. 1994/2841) (as amended from time to time)—
“domestic waste water” (“dŵr gwastraff domestig”);
“industrial waste water” (“dŵrgwastraff diwydiannol”);
“population equivalent” (“cyfwerth poblogaeth”);
“urban waste water” (“dŵr gwastraff trefol”).