方法
根据声明的进水、出水和时长计算可用储量、名义周转时间及逐时段库存连续性。名义周转不等于实际水龄、RTD、T10 示踪接触时间或消毒 CT；本工具不计算 T10。
Usable storage = gross storage × user-entered usable fraction. Operational storage is separately entered as a declared operating-storage basis and remains a subset of usable storage.
Nominal turnover time = usable storage / average throughput; nominal turnovers/day = average throughput / usable storage.
Interval continuity uses Snext = Scurrent + (Qin − Qout) × duration. When physical limits are enabled, overflow is recorded above the maximum and supply shortfall below the minimum; the modeled endpoint is limited to the applicable bound.
Working storage swing = maximum modeled inventory − minimum modeled inventory, including initial inventory and all modeled interval endpoints.