Children spray water onto the Watershed Diorama at the Santa Monica Pier Aquarium (SMPA) during its annual Ocean Appreciation Celebration on Sunday, July 31, 2011. The diorama, which was custom made for Heal the Bay by Andrew C. Aguilar, is designed for pollution education and to illustrate storm water runoff. This year's annual tribute to the ocean at the Santa Monica Pier Aquarium focused on the four habitats of the Santa Monica Bay: the sandy bottom, the kelp forest, the rocky shore and the open ocean.