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Expected Flood Damages to Transportation Infrastructures as a Proportion of Total Event Costs: A Methodological Exploration

机译：运输基础设施的预期洪水损害占总事件成本的比例：方法论探索

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The Tennessee Valley Authority (TVA) operates a variety of facilities throughout the whole of the Tennessee River watershed through which it affects the flows of both navigable and non-navigable waterways. These flows are influenced in support of a number of activities including, commercial navigation, flood risk mitigation, hydroelectric generation, municipal water supply, recreation, and water quality control. Within the realm of flood risk mitigation, the TVA routinely must model the effects of water release practices on the likelihood and magnitude of possible flooding in specific geographic areas. Projected flows are translated into pool elevations that must then be used to estimate expected flood damages. Within this process, the TVA has carefully documented the likely damages to residential and commercial properties, as well as their contents. However, damages to transportation infrastructures have traditionally been captured through the application of a scalar value that is, in fact, intended to reflect a number of ancillary flood damages. Experience, however, suggests that the proportion of total event damages attributable to transportation infrastructure destruction may vary significantly based on the characteristics of individual floods. Specifically, floods that involve significant flows damage both transportation infrastructures and other structures. However, in the absence of such flows transportation structures are far less likely to be effected even when residential and commercial facilities sustain considerable damage. The relationship between flood characteristics and damages to transportation infrastructure is also important to residents of West Virginia. Much like the Tennessee River basin the mid-Ohio River basin is comprised of large navigable waterways that are fed by fast flowing mountain streams.

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