Modular drainage unit

A modular drainage unit system comprising at least two modular drainage units (1) with each modular drainage unit (1) comprising:

• an elongated body (2) having a transverse polygonal cross-section having an upper surface and bottom surface, the elongated body (2) housing a longitudinal extending collecting conduit (3) which facilitates drainage of liquid via the modular drainage unit (1), and the collecting conduit (3) being spaced from the upper surface and adjacent the bottom surface;
• a plurality of flow passages (5) formed in at least the upper surface of each modular drainage unit (1) and communicating with the longitudinal collecting conduit (3) via a transverse channel (51, 52) extending through a peripheral wall of the modular drainage unit (1), and each the flow passages (5) being arranged to facilitate drainage of water to the collecting conduit (3) by gravity;
• each elongated body (2) having a connecting means (6) facilitating assembly of two consecutive drainage units (1) with one another, and
• a water permeable outer casing (7) surrounding the elongate body (2) of each modular drainage unit (1) which permits passage of water therethrough but blocks passage of stone and other material which may obstruct the flow passages (5).

A modular drainage unit system comprising at least two modular drainage units (1) with each modular drainage unit (1) comprising:

• an elongated body (2) having a transverse polygonal cross-section having an upper surface and flat bottom surface, the elongated body (2) being constructed from a material which is able to withstand soil pressure, the elongated body (2) housing a longitudinal extending collecting conduit (3) which facilitates drainage of liquid via the modular drainage unit (1), and the collecting conduit (3) being spaced from the upper surface and adjacent the bottom surface;
• a plurality of flow passages (5) formed in at least the upper surface of each modular drainage unit (1), a plurality of transverse channels (51, 52) extending through a peripheral wall of the elongated body (2) and communicating with the longitudinal collecting conduit (3) to facilitate drainage of from the plurality of flow passages (5) to the collecting conduit (3) by gravity;
• each elongated body (2) having a connecting means (6) facilitating assembly of two consecutive drainage units (1) with one another, and
• a water permeable outer casing (7) surrounding the elongate body (2) of each modular drainage unit (1) which permits passage of water therethrough but blocks passage of stone and other material which may obstruct the flow passages (5).