9After a local authority have, under paragraph 2 above, determined what proportion of their estimated expenditure in respect of a particular financial year is to be met out of the council water charge, they shall, before such date as may be prescribed in relation to that year-
(a)set an amount of regional council water charge or islands council water charge, as appropriate, to be paid for that year in respect of a chargeable dwelling in their area listed in valuation band D (whether or not there is such a dwelling in their area) as specified in section 74(2) of this Act;
(b)determine the amount of council water charge to be paid in respect of a chargeable dwelling in each of the other valuation bands specified in that section in accordance with the proportion mentioned in subsection (1) of that section,
and references in this Schedule to the setting of an amount of council water charge shall be construed as references to the setting of the amount mentioned in paragraph (a) above.
10The amounts mentioned in paragraph 9(a)and (b) above shall be such as will provide sufficient money to meet such proportion of the authority’s estimated expenditure for that year as they have determined under paragraph 2 above is to be met out of the council water charge.