Numbers around Artificial Irrigation

Taking into account a house related irrigation facility for the sake of simplicity, there are few key quantities to keep in mind.

Related to the pipelines
A.)Nominal Water Flow. (litres per minute)
E.g. 45 l/min.
B.)Working Pressure. (kiloPascal or Bar)

E.g. 3,5 Bar.

C.)Maximal Water Flow. (litres per minute)

E.g. 60 l/min.

D.)Diametral Section. (millimetres)

E.g. 25 mm.

Related to the sprinklers
E.)Range. (metres)
E.g. 5 m.
F)Area of coverage. (square metres)
E.g. 8mx8m.

source: Hunter Industries, Guida alla progettazione. Impianto di irrigazione per spazi verdi residenziali.