I have the same error when I try to model with 5 classes of sediments. I tried using SHIELDS PARAMETERS for each class with different particle diameter to equation N°17 in page N° 21 sisyphe manual's and also used SETTLING VELOCITIES for each class of particle equation N°22 page manual. Apparently I have problems logging PRESCRIBED SOLID DISCHARGES, sediment concentration is 8.34 kg/m3 and specific Gravity is (Gs=2800).
If someone solved this problem, I would appreciate your input.
Best regards
Fernando G.
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