To maximise the value of the tree planting,the pits were used as storm water attenuation and treatment pits, taking water from the carriageway, passing it through a stone layer on the top of the tree pit and then filtering it down through the Arborsoil Hydro soil mix provided for the root growth. The water then transferred through a clean stone layer to an underdrain to a storm water drain. This method of conveyance gives an acceptable level of pollutant removal and slows the water down so that the existing drainage network can cope with the increasingly violent storm events.
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Goldhawk Road SUDS Tree Pit
Leonard Circus - ArborSystem
Northwood Hills Regeneration
Sauchiehall Street, Glasgow