Wat. Code, § 56086

If bonds have been issued by the district and the proceeds of the sale have been expended, and the district board by resolution passed by a vote of four-fifths of all its members determines that the public interest or necessity of the district demands the issuance of additional bonds for carrying out any of the objects of the district, the district board may again have a report made, and submit to the voters the question of issuing additional bonds in the same manner as for a first issue. All the provisions of this chapter for the issuance and sale of bonds, and for the expenditure of the proceeds, apply to the issuance of additional bonds.