I made an interactive calculator of this a while ago, adapted from a BBC article. You can see it here (interactive equation at the bottom): https://alexkrolick

I made an interactive calculator of this a while ago, adapted from a BBC article. You can see it here (interactive equation at the bottom): https://alexkrolick.com/rain https://alexkrolick.com/rain Note that it doesn't do oblique angles. EDIT: I've been meaning to update this with a graph for a while -- the plot in the article really illustrates the tradeoff between wetness and velocity quite well.