1. Board Approved Revised Sustainability Criteria for Land Subsidence and Removed Interconnected Surface Water Requirements The board voted to approve the ad hoc SMC committee's recommendations for how the GSA will measure and manage land subsidence going forward. This includes a maximum subsidence rate of 0.08 ft/year basin-wide (0.04 ft/year along the California Aqueduct) and a cumulative subsidence limit of 0.8 ft over 10 years (with 0.5 ft in certain aqueduct mileposts where freeboard is constrained). Importantly, DWR indicated the GSP already states there are no interconnected surface waters, meaning the GSA can eliminate those preliminary sustainability criteria entirely—reducing the regulatory burden on the basin. These revised criteria will be incorporated into the draft updated GSP, which must be adopted by January 2027.
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