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The water needs (volume of pumped water) may be specified  yearly  (constant value), or in monthly / seasonally values.

Specifying needs in terms of hourly values  (daily distribution) doesn't make sense, as most of the time the pumping system includes a storage for at least one day of consumption.

NB: The pre-sizing part cannot take these variations into account and will be established using the yearly average.

Of course, the detailed simulation will rely on these specified values (monthly or seasonally) at each time step.