If the person upon whom notice of a nuisance is served fails to abate the same within twenty (20) days from the date of service, the city may proceed to abate such nuisance, keeping an account of the expense of the abatement, and all such expenses so incurred shall be reimbursed to the city by the person creating, maintaining or keeping the nuisance. (Ord. 129, 7-16-1979)