The drainage and irrigation system, for use with domestic, industrial, sports or leisure ground-works, comprises a channelled mat covered with an upper permeable membrane 4. The mat is formed from upper 1 and lower 2 sections which each include raised inserts which form, in use, channels between them through which water can drain or into which water can be back-filled. The mat has drainage holes in its upper and lower sections and a hose system is connectable to the outer edging of the mats. The system may include a pallet which can be integral or detachable. The mats are preferably formed from rubber granules in a resin suspension.
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