During the 2-hr water supply drill at our seminar in Baldwinsville, NY last month we came across the use of a dump tank numbering system which we had not seen before. The system was really simple in that it used some homemade wooden posts that clipped onto the dump tank frames. On top of the posts were numbers...from there, nothing else was needed other than to clip the posts onto the dump tanks. The best part about the system (other than the numbering) was the ease of deployment and removal. Another example of "simple is often the best."