Any college town can be a challenge to find adequate space for stormwater runoff, especially Ann Arbor.  For maximum flexibility in size, Site Development ordered three underground precast concrete water retention tanks from Advance Concrete Products for the CS Mott Children’s Hospital.  To stay within the tight footprint allowed for storage, modular sections were used for each tank with large openings for flow between parallel chambers.  The large quantities of modular sections were stored at our Highland, Michigan plant until the contractor was ready to take delivery.