Design of Encroachments on Flood Plains Using Risk Analysis

The Least Total Expected Cost (LTEC) design process described herein requires considerable expenditure of resources. Therefore, the level of analysis should be commensurate with the economic risks involved. On the bottom of the risk scale, encroachments which have little or no risk associated with them can be designed using appropriate hydraulic procedures. High risk encroachments which create large economic risks should be designed using the techniques described in this circular. The process of determining which of these responses is appropriate is discussed in this section. The determination of whether or not to design by the LTEC process can be viewed as a screening process. All encroachments are assessed by comparing preliminary data to thresholds for each of the categories shown: lacks practicable detour, hazard to people, and hazard to property. If one or more of the threshold values are exceeded, the encroachment should be designed by the LTEC process. If the threshold values are not exceeded, the encroachment can be designed using traditional design methods.


  • English

Media Info

  • Media Type: Web
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 154p

Subject/Index Terms

Filing Info

  • Accession Number: 01357186
  • Record Type: Publication
  • Report/Paper Numbers: HEC 17
  • Files: TRIS, USDOT
  • Created Date: Oct 28 2011 3:47PM