Fernanda D'Agostino's Urban Hydrology was installed along three blocks of Southwest Sixth Avenue (between Hall and Mill)[3] on the Portland Transit Mall, adjacent to the Portland State University campus, in 2009. It features a series of twelve carved granite stones, each measuring 5 feet (1.5 m) x 5 feet (1.5 m) x 1 foot (0.30 m), bioswales, and native plants. The sculptures are based on scanning electron microscope photographs of diatoms used for determining water quality in urban waterways. The $84,000 project was commissioned by TriMet; other partners included the Environmental Studies Department at Portland State University and the city's Water Bureau.[4]