La. Stat. tit. 33 § 4126
The Board of Liquidation, City Debt, shall annually retain from the revenues derived from the tax levy of three mills for the drainage system of the city of New Orleans provided for herein, an amount which, together with other moneys received by the Board of Liquidation, City Debt, from the sewerage and water board, as hereinafter provided, shall be sufficient to provide for the payment, at or prior to maturity, of the principal of and the interest on the bonds issued under the authority of R.S. 33:4125, and such revenues shall be applied by the Board of Liquidation, City Debt, to such purposes. After providing for the payment of the principal and interest of such bonds and after making such further reservation of revenues derived from the aforesaid tax as may be required by the terms of any contract with the holders of said bonds or as the Board of Liquidation, City Debt, in its discretion, may deem necessary to insure the prompt and regular payment of the principal of and interest on said bonds, the residue of said revenues shall be used by the sewerage and water board of New Orleans for the purposes now set forth in R.S. 33:4124.
In the event the proceeds of bonds issued under R.S. 33:4125 shall have been used by the sewerage and water board to pay for the portion of the cost of drainage work which is to be assessed against lands benefited by such drainage work, the sewerage and water board shall pay over to the Board of Liquidation, City Debt, when and as received, the funds derived from the sale of drainage certificates secured by said assessments, and the total amount of assessments levied upon the property benefited by such drainage works, and the proceeds of the sale of drainage liens upon such property which are not dedicated to the payment of drainage certificates, until a sufficient amount shall have been paid over to the Board of Liquidation, City Debt, to provide for the retirement and redemption of principal of and interest on an amount of the bonds issued under R.S. 33:4125 equal to the face amount of the said bonds the proceeds of which were used to pay the property owners' portion of the cost of the drainage works.
La. R.S. § 33:4126