The board shall have charge of such affairs of the township as are not by law committed to other officers; and it shall have power to draw orders on the township treasurer for the disbursement of such sums as may be necessary for the purpose of defraying the incidental expenses of the township and for all money raised by the township to be disbursed for any other purpose. As to any power conferred upon a township when the manner of exercising the same is not otherwise specifically provided, the same shall be exercised by such board, which may by bylaw provide the details necessary for such exercise.
SDCL 8-5-4