The design day and design hour are the demand conditions a facility is sized to serve, busy enough to be credible, not the single busiest hour of the year. In a parking facility:
- Sizing to the peak hour of the peak day builds stalls that sit empty 364 days; sizing to a representative design condition balances service and capital.
Considerations
- The choice of design condition is a policy decision that should be explicit in the study. Name the day you are designing for, and defend it.