- (a) When there are dams downstream located within the study area as determined by Env-Wr 502.04(g), the owner shall evaluate the effect of the breach flow on these dams.
- (b) If a downstream dam would not be overtopped by failure of the subject dam, no stability analysis of this structure shall be required.
(c) If a downstream dam would be overtopped by failure of the subject dam, the owner shall:
- (1) Include the downstream dam’s failure in the breach model; or
- (2) Submit to the department the results of a stability analysis for overturning, sliding, or other applicable failure mode, as applicable, including factors of safety, for the downstream dam.
- (d) If the stability analysis performed pursuant to (c)(2), above, indicates that a downstream dam is unstable during overtopping for the duration of the event, the owner shall include the failure of the downstream dam in the breach model.
- (e) If the stability analysis performed pursuant to (c)(2), above, indicates that a downstream dam is stable during overtopping for the duration of the event, its failure shall not be required to be modeled in the dam breach analysis.
Source. #8414, eff 8-20-05; ss by #10510, eff 1-22-14; ss by #13980, eff 5-24-24 (formerly Env-Wr 502.08)