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The funds provided by the rates fixed by the Aqueduct and Sewer Authority applicable to the first stage of the project 'Supply of Waters for the Southern-Central Region' in the municipality of Villalba, known as the Toa Vaca project, shall be used:(1) To pay ordinary operational expenses;(2) to pay service of the debt;(3) to provide for renewal and substitution of the structures of the project;(4) the surplus, if any, shall be devoted in the first place to the development of subsequent stages of the Toa Vaca project, or in default thereof, to the construction, improvement and enlargement of aqueducts.The Aqueduct and Sewer Authority shall submit every year to the Legislative Assembly a program of public works which it shall develop with said funds, as provided in the preceding paragraph.This program may be altered by the Legislative Assembly and it shall be executed in the manner approved by the latter. History —July 7, 1971, No. 11, p. 622, § 8.