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8 Decisions for the Future
Pages 117-121

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From page 117...
... The effects from sea level rise scenarios adopted In this report imply that a more considered and planned approach to the preservation or abandonment of coastal facilities and communities is needed. As discussed In Chapters 3-7, the types of responses to sea level rise include retreat from the shoreline or the use of structures to prevent flooding and shoreline recession.
From page 118...
... However, retreat involves foregoing the use of land and perhaps buildings, which represents a large short- to medium-term loss, which knight be outweighted by the long-term cost-saving of doing nothing in an engineering context. Design Life Versus Remedial Measures ~ planning for sea level rise, it Is necessary to consider whether a stabilization project needs to be made at the outset, or whether remedial measures can be taken periodically during the life of the structure or facility.
From page 119...
... An example of a structure with a high risk to life would be a levee protecting a major population center. The consequences of levee overtopping, failure, and flooding to a large urban area would require careful and thorough analysis and a conservative allowance for sea level rise, including the wave action accompanying major storms.
From page 120...
... For coastal wetlands located in relatively protected regions, the costs of stabilizing shoreline positions would probably not be high, due to the less energetic wave cInnate In bays and lagoons. If there is a retreat along bay shorelines, or a ban on shoreline stabilization, marshlands will be allowed to retreat with the sea level rise.
From page 121...
... the steady increase of atmospheric greenhouse gases, which is theorized to enhance global warming, thus contributing to glacial melting and eustatic sea level rise. Coping with these trends will require 0 research, data acquisition, and analysis of the specific effects of sea level rise in relation to other environmental changes and the response of specific coastal works to rise; and _ ~ ~ · ~ · ~ .

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