(ANSA) - ROME, JUL 30 - The drought crisis affecting the Po Valley has become more severe, Po River Basin Authority (Adbpo) said Friday after a meeting of its observatory on water resources. It said the severity level of the emergency has been raised to "high", stressing that "over 100 municipalities in Piedmont and Lombardy are facing critical supply issues" regarding drinking water. In several of these, water tankers have been used for days to refill reservoirs and ensure uninterrupted wate...