The San Diego County Water Authority hopes to recover more than $250 million in fees it says it was overcharged by the Los Angeles-based Metropolitan Water District. Local water managers already won a lower court ruling. A judge found Metropolitan over-charged San Diego for water during a four-year period. Attorney Dan Purcell was hired by San Diego water managers to litigate the case. He argued the San Diego Water Authority negotiated a long-term contract to buy water from the Imperial Valley, replacing the water they had bought from Metropolitan.