Herrick, J. E., Van Zee J.W., Havstad, K.M., Burkett, L.M., Whitford, W.G. Monitoring Manual for Grassland, Shrubland and Savanna Ecosystems, Volume II: Design, Supplementary Methods, and Interpretation. Chapter 8, Single-ring infiltrometer (for water infiltration). https://jornada.nmsu.edu/files/Volume_II.pdf#page=141