What have we done?
A 3-step water management system has been designed in the streetscape. Stormwater from the walkway, the bike path and a large adjacent roof is collected in chambers with a novel first-flush system to remove the bulk of suspended solids and road salts in winter, before it is fed into the Permavoid 85s capillary irrigation subbase.
As soon as the retention and capillary irrigation system is at level (60 mm), the system overflows into the deep drainage Permavoid MD units, from where the water can infiltrate and recharge groundwater for the London Plane trees to absorb and grow with. The Permavoid MD units are equipped with the PermaFilter bio mats to skim and trap any remaining hydrocarbons for further bacterial degradation to prevent unwanted groundwater pollution.
The city of Amsterdam is developing a new main-bicycle-network to accomodate the high volume of commuting cyclists in the city.