Wat. Code, § 8157

The flood control district to which such drainage improvements are transferred shall, upon acceptance of such transfer by four-fifths vote of the members of the governing body of the district, assume and provide for the operation, maintenance, and repair thereof, and thereupon be and become solely liable for the payment of the principal upon the bonds of any drainage improvement district, including bonds of districts secured by and payable out of a fund derived from specific or direct assessments which are a lien against particular parcels of land issued pursuant to the Drainage District Improvement Act of 1919, maturing subsequent to the date of such conveyance and transfer and for the payment of the interest upon the bonded debt of such drainage district represented by coupons maturing subsequent to the date of transfer.