In the coming days and weeks, some of the implications of climate change and the need to improve California’s aging water delivery system will become more evident to all parts of the state, none too soon. Old lines in California’s unending water wars could start to shift, as Gov. Jerry Brown’s administration makes clear that the holders of senior water rights, which date to the turn of the last century and before, are not immune to the demands of the environment and the realities of diminishing supplies of what they claim as their water.