The board of trustees shall at least once in each month pay to the county treasurer all moneys received by them as hospital fees or otherwise, which shall be by him deposited in the county hospital fund, which fund shall be available for the payment of any expenses incurred in operating such county hospital. The county commissioners may appropriate by resolution any surplus moneys in the county hospital fund for the purpose of constructing or renovating hospital facilities or equipping such facilities.
SDCL 34-8-20