The invention refers to a golf course irrigation system having a golf course irrigation network (100) comprising at least two water-storage and water-purification systems (1), each comprising: a reservoir (2) which is filled at least partially by porous material (3), characterised by
(i) at least one barrier layer (5) for extending the seepage path of the water,
wherein the barrier layer (5) is disposed within the substantially water-impermeable, artificial and outwardly delimited reservoir (2), the barrier layer (5) is provided with at least one passage (6) for water and porous material (3) is located above and below the barrier layer (5); and
(ii) a water collecting container (4) which extends from the bottom of the reservoir (2) at least to the surface thereof,
wherein the water collecting container (4) comprises an opening (7) above the uppermost barrier layer (5) and at least one opening (8) below the lowermost barrier layer (5), through which openings water can flow, wherein a cultivation layer (10) is applied to the porous material (3) above the uppermost barrier layer (5), wherein a first water-storage and water-purification system (1) is a main system, and at least a second water-storage and water-purification systems (1) is at least one secondary system (1b), and wherein the main system (1a) and the at least one secondary system (1b) are connected to each other, preferably by conduits (1c).