The top state agencies that manage water and wildlife resources in California submitted a package of voluntary agreements with water districts to the State Water Resources Control Board on Friday, as an alternative to controversial flow requirements approved in December for the Tuolumne, Stanislaus and Merced rivers. The agreements, hammered out in the waning hours of Gov. Jerry Brown’s administration and favored by Gov. Gavin Newsom, combine increased river flows with a larger set of tools for restoring salmon in rivers that feed into the San Joaquin-Sacramento Delta.