In DAMBRK you can define the unit weight for the tailings dam slurry within the Boundary Conditions input screen. From the Data Input menu, select Boundary Conditions, and then press the [Page Down] key 3 times. You will then be in the Mud/Debris Routing Description input screen. In this screen you can define the unit weight, dynamic viscosity, and other related material.
If you have any additional questions or need any further information, please contact me again.
Sincerely,
Chris E. Maeder, M.S., P.E.
Senior Technical Engineer
chris.maeder@bossintl.com