Material from this website is free to use, but if you use it in a publication or report please add the following reference:
Miedema, S.A., "The Delft Head Loss & Limit Deposit Velocity Model". www.dredgingengineering.com. Delft, The Netherlands, 2012-now.

The original data of Thomas (1976), hydraulic gradient versus line speed , reconstructed.

The  data of Thomas (1976), relative excess hydraulic gradient versus liquid hydraulic gradient , reconstructed.