  Roberts' model of lunar soil erosion beneath a landing rocket has been
updated in several ways to predict the effects of future lunar landings. The
model predicts, among other things, the number of divots that would result on
surrounding hardware due to the impact of high velocity particulates, the
amount and depth of surface material removed, the volume of ejected soil, its
velocity, and the distance the particles travel on the Moon. The results are
compared against measured results from the Apollo program and predictions are
made for mitigating the spray around a future lunar outpost.
