MADRID Three days after historic flash floods swept through several towns in southern Valencia, in eastern Spain , the initial shock was giving way to anger, frustration and a wave of solidarity on Nov. 1. Many streets are still blocked by piled-up vehicles and debris , in some cases trapping residents in their homes. Some places still don't have electricity, running water or stable telephone connections. Residents turned to media to appeal for help. “This is a disaster. There are a lot of