oil pastel on paper, 14" x 12" Site of Common Ground Wetlands Restoration project. Bayou Sauvage is possibly the largest national wildlife refuge within a city, located in the east of New Orleans. The Hydrology (movement of water due to seasonal changes) is artificially managed because the levees have interrupted the natural hydrology. Gates to control the water levels mimic the seasonal changes. Common Ground volunteers have replaced a lot of the grasses here called Spatina Acturnal flora.