The project I am working on has total FTE -103 (90 Office employees + 13 Maintenance, Cleaning, and Security). Not all the floors of the building have the same occupancy times (Irregular FTE and Irregular Occupancy Schedule). Also, different floors have different plumbing fixtures. We had considered an individual group (sheet in excel) for each floor to address the issue. Floor schedule listed below –

  1. Part of the first 2 floors is an Auditorium (capacity 256), which will be used only on weekends to conduct seminars for all employees including the satellite offices from neighboring areas. (256 considered as Visitors) – Days of annual operation - 104 (52 Sundays + 52 Saturdays) [Employees - 6, Visitors - 256]
  2. Office floors – Normal occupancy - Days of annual operation - 251 (5-day/workweek X 52 weeks - 9 holidays) [Employee quantity as per the seating capacity of each floor]
  3. Gym and Yoga floor, Library floor – Here maintenance personnel are considered employees and others (actual office employees who use the gym) are considered as visitors. - Days of annual operation - 303 (6-day/week X 52 week - 9 holidays) [4 Employees and 60 visitors]
  4. Top floor Board meeting room – Used only once a week. Capacity - 40. Days of annual operation – 52 (Fridays)

Reviewer has raised a point, considering irregular FTE in WE calculator and information mentioned in the PI form. Our dilemma is, if we considered 103 employees in all the sheets or try to make total FTE equal to 103, the water demand would go unreasonably high and would not represent the actual true water demand of the project.

Since the project is using rain-water harvesting method to offset the toilet flushing requirement, the reduction in water savings would reduce significantly for no right reasons. Any help or suggestions to address the issue?