Students (K-12) in ocupancy table for WE calcualtions

K-12 is how US schools are labeled; it stands for kindergarten through 12th grade, and is all the schooling prior to potentially entering college. In most places, elementary school is K-5, middle school is 6-8, and high school is 9-12.  For your water calcs, is there a break between the 4-hour shifts? What the reviewers will want to know, and how the project should anticipate peak usage, is if those two shifts overlap where there would be a total of 500 students using the facilities all at once. I would think the staff would want to be its own usage group, since it's likely their hours are different, so their usage pattern would be different.