San Joaquin County has joined several local water districts and boards in opposing a state plan to increase pulse flows in the lower San Joaquin River. The San Joaquin County Board of Supervisors on Tuesday unanimously expressed its opposition to proposed changes in the Water Quality Control Plan presented by the state. Supervisors said the state’s plan, which involves increasing flows out of the lower San Joaquin River in an effort to protect fish and wildlife in the southern portion of the county and much of Stanislaus County, doesn’t have benefits at all.