[Rainwater tank The tank has an internal porous concrete wall (8) to define a storage space (3.30) and a buffer space (9,90,91). The inner wall is made of draining concrete with a maximum water permeability of 0.05 liter / m² / s to 5 liters / m² / s inclusive, preferably from 0.1 liter / m² / s to 3 liters / m² / s included, water permeability being measured in the case of storage space almost filled with water (3). Figure for the abstract: Fig. 3]
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