The levy herein authorized shall not exceed the amount so needed nor in any case be an amount in excess of the limitation prescribed by Kan. Stat. Ann. § 79-1947, in any one year. Said levy shall be in addition to the aggregate for all county purposes, provided in Kan. Stat. Ann. § 79-1947, providing that, 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, the levy herein authorized shall be credited to restore said funds so lost and in the event said levy raises funds in excess of that lost, then such should be credited to the county general fund of said county.