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Commission keeps conservative sea-level-rise approach as staff vows more data and alternatives
Summary
Commissioners debated adopting high sea-level-rise scenarios (to account for subsidence and worst-case impacts) versus intermediate projections; staff defended a conservative approach for planning but agreed to return with alternative scenarios, ranges, and a proposal for periodic updates and a Bay-wide adaptation plan timeline.
Commissioners spent substantial time on Chapter 5 sea-level-rise policies, challenging staff about which projection to adopt for planning horizons. Staff explained the draft uses a "high" scenario to capture subsidence and worst-case impacts, and described a proposed sea-level-rise combining (overlay) zone to identify areas subject to future inundation and to set standards for development and management.
Members urged more granular, Bay-wide vulnerability assessments and questioned the planning horizon and timing: several recommended an intermediate or intermediate-high scenario for some timeframes and asked staff to reconcile differing numbers in related documents (for example, the Samoa master plan). Commissioner comments also called for policies to be revisited on a regular cadence as science evolves; staff said they would present ranges and alternatives at the continued workshop and noted funding and grant timelines that affect how quickly a full adaptation plan can be produced.
Staff also highlighted ongoing local work: feasibility and nuisance-flood studies for King Salmon and Fields Landing and a grant-supported effort to evaluate adaptation options. Director Ford said the county will bring a clearer set of alternatives back for commission review and public input.
