Flat roof water tank for walking and gardening for all types of buildings and structures, comprising: a layer (7) separating the horizontal framework (6), a waterproofing membrane (8), height adjustable supports (4) distributed over said membrane, flagstones (1) which by pressing on the supports (4) will constitute the floor for walking and gardening in the tank, a substrate or vegetable layer (12) spread over said flagstones, strips (13) of a material with capillarity properties, which envelop the flagstones (1) and take the stored water to the vegetable substrate (12), and drainage means (10, 11).IMAGE
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