S.D. Codified Laws § 34-48A-32

In those counties in which the Governor has officially declared an emergency or disaster and in which local effort requirements have been met, the state will provide financial assistance for such additional operational costs needed for the particular emergency or disaster situation up to a maximum of sixty percent of additional local effort expenditures; provided, however, that the Governor upon finding it necessary for the preservation of life and property may authorize additional state financial assistance.