Water permeable soil retention, grass support and anti-compaction structures made from plastics and/or of a grid structure and modular units thereof which are connected together to form said structures; water permeable pavers, namely, those containing a plastic substructure and pebble infill; water permeable concrete, tar and road and pavement surfacing materials, namely, crushed stone, bitumen based coatings, asphalt and concrete emulsions; plastic underground drainage, infiltration and reticulation containers and plastics field disposal units for the retention and dispersal of waste water, storm water and rainwater; porous or perforated plastic underground modular containers, namely, perforated and non-perforated plastics tanks and tank modules for the retention and dispersal of waste water, storm water and rainwater; porous or perforated plastic drainage pipes; plastics drainage cells; geofabrics for use in the treatment of water, permeable and non-permeable woven and non-woven geotextiles for use in the treatment of water