Abstract: Modular block (10, 10?, 10?) for civil works, comprising a base body (11), a plurality of structural protrusions (12) that develop from the base body (11) according to a matrix configuration and interconnecting means (14) to blocks (10, 10?, 10?) belonging to the same modular system. Around the structural protrusions (12) there is some space (S1, S2) suitable for defining channels (C) for the arrangement of material and/or for the passage and/or the standing of liquids and/or air. These channels (C) are formed by coupling or arranging side by side of blocks (10, 10?, 10?) belonging to the same modular system.