Marin County has less than a year of water supply in its reservoirs. That what the General Manager of the Marin Municipal Water District said yesterday. Ben Horenstein told participants of a drought and wildfire teleconference that supplies are at levels typically seen in the third year of drought, and this is only the second year. He said they are planning for the worst-case scenario since it could be dry again next winter. Potential solutions on the table include building a permanent water pipeline across the Richmond-San Rafael Bridge, a desalination plant or a groundwater storage system.