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The California Environmental Flows Framework (CEFF) provides an approach for evaluating ecological flow criteria and options for developing ecological flow prescriptions that can accommodate a variety of stream types and biological communities, while supporting regulatory and management agency programs aimed at protecting beneficial uses for aquatic life. CEFF allows for the assessment of ecological flow criteria based on natural variability of ecologically-relevant functional flow metrics. It guides the user on selecting appropriate methods for refining these criteria to develop ecological flow prescriptions given regional or site-specific stream conditions, management goals, and desired ecological outcomes.