Well, what are they calling the recent rain in your area? 100 year event? 500 year event? Heavy rain?

Has water gone over the emergency spillway as well? If not, then maybe the dam builder could be called onto the carpet. If water has gone over the spillway, then I would want to know details about the watershed, and would be curious if the dam builder took these details into account properly. Still, a once in a lifetime rain event seems hard to plan for. At least it seems difficult to this pondowner who's never built a dam in his life.

Nevertheless, if it were mine I would do whaever it took to get some cover on that dam. No one here is suggesting the lack of vegetation caused the failure, only concerned that without grass, the dam will continue to erode.

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.