Now the site is cleared and the work can begin to create the parking lot which will feature plenty of spots compared to our current lot.
While you will never see it, the drainage system will be very cool. In order to send storm water as slowly as possible into the city sewer system, we have installed a system of drywells that could contain a “50 year” storm. This is the worst storm that might come along only once every 50 years. The drywells are perforated cement containers fed by drains in the parking lot surface. There is enough capacity to contain the water from the “50 year” storm and let it gradually drain out through the perforations. Visit the drainage gallery to see more pictures of the process.
Article source: http://restoreonline.org/expansion/?p=240