Over time, what happens to citrus groves that were planted below the Southern California mountain foothills?

Residents have mixed feelings about debris basins. Some aren't even aware of their existence. Others consider these basins to be an assault on nature. Some find them visually unattractive. Others feel the basins work well. And still others are well aware of potential dangers but feel that the setting, views, and serenity are worth taking a risk for.