FLOOD03186 - Laserfiche WebLink

Home Browse Search

VERSION 1.0 1/12/95 B-C PROGRAM: Level One Analysis Project Description Project Useful Life Mitigation Effectiveness Estimates Project Description ' Project Useful Life (yearsl PINK Block (Information Only). This space is provided to enter a brief summary of the proposed mitigation project, for example, "buyout," "relocate," or "elevate ten feet." GREEN Block (Data Input). The project's useful life is the estimated number of years during which the mitigation project will maintain its effectiveness. Useful life is the time period over which the estimated economic benefits of the proposed mitigation project are counted. The useful life which the user enters MUST be commensurate with the actual project being considered. Useful lives of 5 to 10 years for equipment purchases, and 30 (residential) to 50 (non-residential) years for building ,projects are typical. For major infrastructure projects, or for historically important buildings, useful lives of 50 to 100 years may be appropriate. For buyoutslrelocations an entered lifetime of 100 years will capture fully the benefits of the mitigation measure. GREEN Block (Data Input). The effectiveness of most flood mitigation projects varies with the depth of flood water. For the flood mitigation type selected, enter estimates of the depth at which the mitigation is 100% and 0% effective: Elevation Elevating buildings by N feet is generally 100% effective to N-1 feet. For example, elevating 8 feet is 100% effective to 7 feet, elevating 12 feet is 100% effective to 11 feet. This result arises from the fact that, for example, an "8-foot flood" is considered in the program to be all floods between 7.5 and 8.5 feet. Therefore, elevating a structure 8 feet will convert an 8- foot flood into a O-foot flood (from -0.5 to 0.5 feet), and there is still damage from a O-footflood. Thus, an 8-foot elevation is 100% effective to only 7 feet. 6-15