As part of the Central Arroyo Stream Restoration, the parking lot in Brookside Park near the Rose Bowl in Pasadena was retrofitted with islands designed to collect and treat water flowing over the parking lot in order to remove pollutants before the rainfall and storm flow enters the Arroyo Seco stream. The islands are planted with native trees and shrubs which clean up the runoff.
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Ten native plant islands capture and filter rain and runoff from the Rose Bowl Parking Lot I before it enters the Arroyo Seco stream. The flow contains oil, grease and other pollutants that harm fish and aquatic life. The native plants include sycamore and oak trees, redberry, sage, and California rose. Porous parking spaces allow water to naturally infiltrate into the ground to improve water quality and reduce the "heat island" effect through evaporative cooling.