Nev. Rev. Stat. § 450.310
In order to insure the payment of the general obligation bonds of the county, the payment of which is additionally secured by a pledge of revenues of such hospital facilities, of any such other income-producing project and of any such excise taxes, as provided in NRS 450.290, or other such additionally secured general obligation securities of the county, there may be established and maintained, and from time to time revised, a schedule or schedules of fees, rates and charges for services, facilities and commodities rendered by or through such facilities and any such other income-producing project and a schedule or schedules of any such excise taxes, as the case may be, by the board of hospital trustees for such hospital facilities and otherwise by the board of county commissioners, in an amount sufficient for that purpose and also sufficient to discharge any covenant in the proceedings authorizing the issuance of any of the bonds or other securities, including any covenant for the establishment of reasonable reserve funds.
NRS 450.310