A conceptual breakthrough has emerged for the Colorado River’s future. Here’s what it looks like.

Negotiators from the seven river basin states said in a series of meetings in recent weeks that they were discussing a plan rooted in a concept that breaks from decades of management practice. Rather than basing water releases on reservoir levels, it would base the amount released from the system’s two major reservoirs on the amount of water flowing in the river. The new concept would be more responsive as river flows become more variable.