Brian Arden Winery in the Napa Valley, California town of Calistoga constructed a new facility for the production of their high quality wines. The civil engineers for the project selected a large scale RainSpace Stormwater Management and Rainwater Harvesting water storage system consisting of large high capacity multiple underground inter-connected RainSpace chambers. Placing the system under the parking lot increased the utility of the site and preserved the esthetics. The parking lot bears heavy truck loads from wine shipments and high volume customer car traffic and parking. This RainSpace System provides both stormwater retention from rainwater harvesting for water storage that is used for on-site irrigation and stormwater detention infiltrating stormwater collected from building roofs and hardscape into the subsoil.