The board of county commissioners in any county having a population of not less than 175,000 or more than 250,000 may levy each year a tax upon all taxable tangible property in their respective counties and the proceeds thereof, except for an amount to pay a portion of the principal and interest on bonds issued under the authority of Kan. Stat. Ann. § 12-1774, and amendments thereto, by cities located in the county, shall be placed into a separate fund designated as “the county hospital fund,” which fund is hereby created, and shall be used only to provide and pay for hospitalization for medically indigent persons who have resided in any such county for a period of not less than one year immediately preceding any application for hospitalization as a medically indigent person, and resided in the state for not less than two years during the four years immediately preceding any application for hospitalization as a medically indigent person. The provisions of this act shall not abrogate or amend any other existing laws relating to hospitalization of any person or persons.