C.R.S. § 32-11-544

(1) Any district securities designated in section 32-11-501 (2) and otherwise issued under this article, as may be provided by the board in a resolution authorizing their issuance and in any indenture or other proceedings pertaining thereto, may be issued at, above, or below par, at a discount not exceeding seven percent of the principal amount of the securities; but they may not be issued at a price such that the net effective interest rate of the issue of securities exceeds the maximum net effective interest rate authorized. (2) Such district securities shall bear interest at a rate such that the net effective interest rate of the issue of securities does not exceed the maximum net effective interest rate authorized.