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Last modified
1/25/2010 7:11:51 PM
Creation date
10/5/2006 3:00:44 AM
Metadata
Fields
Template:
Floodplain Documents
County
Statewide
Community
State of Colorado
Stream Name
All
Basin
Statewide
Title
The Design of Encroachments on Floodplains Using Risk Analysis
Date
10/1/1980
Prepared For
USDOT
Prepared By
Federal Highway Administration
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />e <br /> <br />Figure 2.2 RISK ASSESSMENT FOR ENCROACHMENT DESIGN <br /> <br />Proj ect <br /> <br />. Encroachment Location <br /> <br />, <br /> <br />Encroachment Design: <br />Case 1: Minimum Structure <br /> <br />Minimum Fill <br /> <br />Case 2: Minimum Structure <br /> <br />Maximum Fill <br /> <br />Estimated Value <br />for Encroachment <br /> <br />Threshold <br />Value * <br /> <br />1. Hazard to People and Property: <br /> a. Traffic related losses <br /> 1 ADT VPD VPD <br /> 2' Overtopping flood <br /> probability, Case 1 '" '" <br /> '" 10 <br /> b. Roadway losses <br /> 1 Embankment volume CY CY <br /> 2' Overtopping flood <br /> Probability, Case 1 % " <br /> irl <br /> <br />e <br /> <br />c. Backwater related losses <br />1 Land use <br />a Number of residences <br />b Number of other <br />bui 1 di ngs <br />2 Overtoppi ng flood <br />Probability, Case 2 <br /> <br />'" <br />'" <br /> <br />'" <br />,0 <br /> <br />. <br />2. Other Factors: <br /> a. rleeded for emergency supply ~, <br /> evacuation route rJo Yes <br /> b. Needed for emergency vehicle access No Yes <br /> c. Lacks practicable detour No Yes <br />.. d. Encroachment on regul atory flood\vay No Yes <br /> <br />I f the answer to any of the other factors is yes or if any of the factors <br />which indicate hazard to people or property exceed the threshold, analyze tne <br />encroachment using the LTEC design process or justify \vhy it is not required. <br /> <br />* Thresholds to be determined by LTEC design experience <br /> <br />e <br /> <br />5 <br />
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