Conventional drywells do not posses any significant storage space, which limits their stormwater inflow capacity to their infiltration rate. This often leads to the need for numerous drywells which may not fit the site dimensions because of the required well spacing.

WaterSilo drywells provide a large detention space that greatly increases its stormwater inflow capacity. This leads to fewer number of drywells and significant reduction of schedule and cost for a given site.