FTE definition for other occupants

To answer your questions:1) LEED does not have a rigid rule for this situation. You need to use some common sense in making sure that these visitors are factored into the water calculations, in some way.2) They need to be counted—I think you have some leeway in deciding what method works best. Either of your solutions could work, as long as the calculations are relatively accurate in reflecting their usage.

That's a good question, Pablo. The key point is that you'll want to make sure that you're using consistent figures for occupancy throughout your entire LEED application. So, while it is best to assume that the number of occupants is the total number at the time of your application, you'll need to cross-reference the values that you use for any credits that depend on occupancy to ensure that the application data is consistent; if the values are not consistent because you completed certain tasks at different points in your performance period, you'll just need to be very thorough in your narratives to explain why there are discrepancies in your data. For instance, if your occupancy was 200 FTE and 50 visitors in May when you completed your WEp1 calculations, but was only 150 FTE and 25 visitors when you conducted an Alternative Commuting survey for SSc4 back in March, you don't need to conduct a new survey, but should provide a detailed narrative explaining why two different values for occupancy are applicable to the two different credits. Ideally, these values would be consistent across all credits, but it will not invalidate your application if there are discrepancies as long as you have a reasonable explanation for the differences.