§ 105.98. Design flood criteria.
(a) The discharge capacity or storage capacity, or both, shall be capable of safely accommodating the recommended design flood for the size and hazard potential classification of the dam as determined by § 105.91 (relating to classification of dams and reservoirs). The design flood is intended to represent the largest flood that need be considered in the evaluation of a given project. When a range of design flood is indicated, the magnitude that most closely relates to the size and hazard potential shall be selected. Design flood criteria shall be as indicated in the following table:
| Size and Hazard Potential Classification | Design Flood |
| A-1.A-2.B-1 | PMF |
| A-3,B-2, C-1 | 1/2 PMF to PMF |
| B-3, C-2 | 100 year to 1/2 PMF |
| C-3 | 50 year to 100 year frequency |
(b) The Department may, in its discretion, require consideration of a minimum design flood for a class of dams or reservoirs in excess of that set forth in subsection (a) when it can be demonstrated that the design flood requirement is necessary and appropriate to provide for the integrity of the dam or reservoir and to protect life and property with an adequate margin of safety.
(c) The Department may, in its discretion, consider a reduced design flood for a class of dams or reservoirs when it can be demonstrated that the design flood provides for the integrity of the dam or reservoir and protects life and property with an adequate margin of safety.
The provisions of this § 105.98 adopted September 26, 1980, effective September 27, 1980, 10 Pa.B. 3843.
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