This discussion is adapted from Walter J. Meyer, "Falling Raindrops," pp. 101-111, in Applications of Calculus, edited by Phillip Straffin, MAA Notes No. 29, 1993. The authors developed this material first as a laboratory project for the first edition of this text, then as a module for the Connected Curriculum Project. The module was subsequently published in Volume 4 of the Journal of Online Mathematics and its Applications.