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"respectively as 'the western valley tank' and 'the eastern valley
“tank,' or other tanks provided by the Corporation in substitution
"therefor, with the consent of the Local Government Board;
"(3) The outlet valve at the western valley tank shall not be
"opened except between the hours of one hour before high tide and
"three and a quarter hours after high tide;
"(4) The outlet valve at the eastern valley tank shall not be
"opened except between the hours of high tide and three and a
"half hours after high tide;
"(5) The sewage discharged into the sea by means of the outfall
"sewer (Work No. 3) authorised by this Act, shall be caused to
"pass through the tank (Work No. 2) authorised by this Act. the
"capacity of which shall not be less than one million two hundred
"thousand gallons, or such other tank as may be provided by the
"Corporation in substitution therefor with the consent of the Local
"Government Board, and the outlet valve at such tank shall be
"opened only between the hours of one hour before high tide and
"three and a quarter hours after high tide;
"(6) Immediately after closing the outlet valve at the eastern
"valley tank hereinbefore referred to, the Corporation shall cause to
"be discharged through the said existing outfall sewer a quantity
"of sea water not less than one hundred and forty thousand
"gallons;
"(7) Immediately after closing the outlet valve at the tank
"(Work No. 2), constructed in pursuance of this Act, the
"Corporation shall cause to be discharged through the outfall sewer
"(Work No. 3) authorised by this Act, a quantity of sea water not
"less than three hundred thousand gallons ;
"(8) The Local Government Board may, on the application of
"the Corporation, vary the times referred to in sub-sections (3)
"(4) and (5) of this section; provided that one month before
"applying to the said Board for a variation of such times the
"Corporation shall give notice of the intended application by means
"of advertisements inserted in two or more newspapers published
"or circulating in the borough;
"(9) The provisions of this section shall not apply at times when,
"in consequence of rain, it is necessary for the Corporation to
"discharge sewage by means of their storm water overflow sewers,
"or to use the said outfall sewers as storm water overflow sewers ;
"(10) Subject to the last preceding sub-section, if the Corporation
"fail to comply with the provisions of this section, they shall be