The San Diego County Water Authority, tired of paying a middle man to deliver water from hundreds of miles away, is starting to cast out for ideas once written off as laughable. One board member has even suggested San Diego may consider building a pipeline of its own to the Colorado River. The pipeline would give the Water Authority a chance to accomplish a long-held goal: breaking a monopoly held by the Metropolitan Water District of Southern California, the region’s largest water supplier and the owner of the only physical connection San Diego has to the Colorado River.