Any loan agreement may contain a provision whereby the hospital agency or public agency agrees to impose a daily charge upon persons using the hospital facilities financed out of the bond proceeds (or any other hospital facilities owned or operated by the hospital agency or public agency) in an amount sufficient to produce revenues adequate to discharge the obligation of the hospital agency or public agency under the loan agreement; and further, that in the event the hospital agency or public agency shall fail to impose such daily room charge at the request of the county or its assignee, then and in that event the county or its assignee may proceed to compel by specific performance the imposition and collection of such a daily room charge and the use of the revenues derived therefrom to discharge the obligations of the hospital agency or public agency under the loan agreement.