Environmental security adaptations

The adaptation strategies for environmental security maintain the existing high priority placed on ecosystems, but urban demand side management programmes are implemented (20% reduction by 2100). In addition, the threshold for flooding of the major Yolo bypass is lowered, thus effectively allowing the frequency of diversions of flood waters for wetland habitats to be similar to current conditions. Without this adaptation, the frequency of flooding dramatically drops. Winter rice flooding is adopted throughout the Sacramento Valley to provide additional habitat for migrating birds, requiring an additional demand of 123 X 106 m3 over the entire winter (December to February). Lastly, restrictions on the maximum withdrawals are made for each aquifer sub-basin. These restrictions are based on the monthly mean abstraction rates during the historical period to prevent the rapid unsustainable decline in groundwater storage that occurs without adaptation in the future.

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