S.D. Admin. R. 74:02:08:08
In addition to the minimum spillway design flood requirements of § 74:02:08:07, all new category 1 and 2 dams must have low-level drawdown facilities. If an existing category 1 or 2 dam undergoes extensive repairs which require complete drawing down of the reservoir or is being repaired after the dam has failed, a low-level drawdown facility must be installed. A low-level drawdown facility may be either a gated pipe through the embankment that would allow the release of water below the primary spillway or sufficient available pumping capacity to draw down the reservoir. A breach analysis report must be completed by the owner for the proposed dam if a preliminary risk assessment indicates that the dam is a category 1 or 2 dam and must be submitted to the chief engineer with the plans and specifications required by § 74:02:08:09. A breach analysis, if required, must be performed with a simulated water surface at or above the top of the dam.
S.D. Admin. R. 74:02:08:08
General Authority: SDCL 46-2-5, 46-7-3.
Law Implemented: SDCL 46-5-8 to 46-5-11, 46-5-47, 46-7-3, 46-7-5.