74:02:08:07.04Design requirements
Section · Administrative Rules of South Dakota · View on sdlegislature.gov ↗
for dams constructed without spillways. Dams which are designed and constructed without spillways and constructed so that there is no external drainage into the facility, and constructed for the purpose of containing process water shall be sized to contain design operating volumes from the operation plus enough freeboard to contain the PMP falling on the facility.
Source: 15 SDR 158, effective April 23, 1989.