Table PIf3-3 Total Daily Occupancy

Dale,
The Daily Average Transient is used to calculate the water consumption over the course of the year for WEp1 and WEc3. With these occupancy numbers rough estimates are fine - you don't usually see big changes in the water performance (% savings) if you have a FTE of 25 or an FTE of 100. The flow rates of the fixtures have a much greater impact.

Using cowboy math for just the transients from your training class, here's one way to estimate it:
- Assume 5 days/ week for 52 weeks = 260 days of operation.
- If the training class is once a month, and average attendance is 50 people, that's 600 (50 x 12) transients over a year.
- Average those 600 peoples over the days of operation, 600/260=2.3 average transients per day. Rounded up it only adds 3 to your Daily Average Transients.
- If the class was once a week it would be (50 x 52)/260 = 10 transients per day on average. Add that to your 3 deliveries, and you could be at 13 Daily Average Transients.

Sound reasonable?

I also have a question regarding daily average transients. I have read a few different interpretations of what this number is supposed to be, and I want to be sure that for our case, we're calculating it correctly.
Our project is a new academic/classroom building at a University. Our peak transient number is 1100 which represents the number of students/visitors in the building at the busiest moment of the day.

For the daily average, do we calculate:

A) What would be the average number for a typical moment in the day when the building is occupied?
or
B) What is the total number of transients visiting the building throughout the day, on average

also, to calculate this average number, the explanation on the form says it is the "daily average per day calculated on a yearly basis." so, considering we have very different occupancy numbers during the school year as compared to over the summer, do we take an average of our number for all 365 days, or just for the months when school is in session?

Thanks very much for any feedback!

Libby - how did you resolve that last question regarding the average per day on a yearly basis vs. the school/year summer? I'm facing the same problem. Thanks.

I am also interested in the "average per day on a yearly basis" question. Do I divide by 365 days or the actual number of days a building is in use throughout the year?

Thank you!

Since the daily average is used to calculate water fixture usage, you should use the annual days of occupancy which you report on the WEp1 form (as well as PIf3) to do your average.