Haw. Rev. Stat. § 342D-93: Trust indenture.

(a) Any trust indenture entered into by the director may contain covenants and provisions as authorized by part III of chapter 39, and approved by the director of finance, as deemed necessary, advisable, or expedient by the director for the purposes of this part.

(b) A trust indenture may also contain provisions deemed necessary, advisable, or expedient by the director to obtain or permit, by grant, interest subsidy, or otherwise, the participation of the federal government in the water pollution control loan program or in the financing of the costs of administering, operating, or maintaining the water pollution control loan program to which such trust indenture relates.