The two Rainstore3 detention chambers utilize geo-grid below and above with a heavy filt fabric wrapping the 3 unit high by one unit wide system. Between the street and the chambers and the sidewalk and the chambers there is a 20 mil PVC liner 4-5’ deep to keep any water from getting under the street or sidewalk. The water can only percolate directly below into the soil.

One meter width of Rainstore3 works perfectly for this detention application.

Geogrid is applied to the Rainstore3.

A Geomembrane liner is used to keep the water from getting under the street.

Rainstore3 is wrapped in geotextile fabric before side fill is placed.

A monitoring and pump-out service access is seen in this photo.