All money received by the city treasurer on any special assessment shall be applied to the payment of the improvement for which the assessment was made. The money shall be used for the payment of interest and principal on bonds or other indebtedness issued in settlement thereof, and shall be used for no other purpose whatever, except as otherwise provided in Utah Code Annotated section 10-6-131. (1962 Code § 1-10-7; amd. 2003 Code)