(9) Every Sewerage Authority shall keep at its offices a register of all expenses incurred in respect of work performed by the Authority under this section, and shall show in such register the total amounts thereof, the instalments in which the same have been incurred, the rate of interest payable, the name of the owner of the said premises and the balances outstanding; and shall keep such register open at all reasonable times to the inspection of any person, free of charge. Such register and any extract therefrom, certified by any person authorised by the Sewerage Authority in that behalf, shall, in any proceedings for the recovery of such expenses or interest thereon or any instalments thereof, be prima facie evidence of the matters contained therein.