The hydraulic roughness length can be expressed as a fraction of the 50 percentile sieve size of soil or rock: z_0=d_50/12.
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Cite the database: Quaeghebeur, E., Sanchez Perez-Moreno, S., and Zaaijer, M. B.: WESgraph: a graph database for the wind farm domain, Wind Energ. Sci., 5, 259–284, 2020. doi:10.5194/wes-5-259-2020
This page: https://wesgraph.anemona.io/concept/hydraulic-roughness-length-model/