McCoy, S., Coe, J., Kean, J., Tucker, G., Staley, D. and Wasklewicz, T. 2011. Observations of debris flows at Chalk Cliffs, Colorado, USA: Part 1, In situ measurements of flow dynamics, tracer particle movement and video imagery from the summer of 2009. Italian journal of engineering geology and environment. (Nov. 2011), 715–726.