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Last modified
1/25/2010 7:14:00 PM
Creation date
10/5/2006 3:29:09 AM
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Template:
Floodplain Documents
County
Jefferson
Community
Floodville
Basin
South Platte
Title
Local Pre-Disaster Flood Mitigation Plan
Date
6/1/1995
Prepared For
Jefferson County
Floodplain - Doc Type
Flood Mitigation/Flood Warning/Watershed Restoration
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<br />C. Flood Hazard Data <br /> <br />Not only should the location of flooding be determined but the severity of flooding should <br />be described as follows: <br /> <br />1. Sources of Water: The names of rivers and lakes should be included as well as <br />other sources of local drainage, ponding and stormwater runoff. <br /> <br />2. Depth of Flooding: No flood hazard area can be considered safe, however, <br />flooding over three feet is more hazardous. Areas subject to such depths should <br />be identified by comparing base flood elevations with ground elevations. <br /> <br />3. Velocities: Flood water velocities over 5 feet per second are most hazardous <br />especially when combined with deep flooding. Since velocity data is often hard <br />to obtain and it can include inaccuracies, the following rule of thumb should be <br />used for planning purposes: I) One foot deep - no vehicles; and 2) three feet deep <br />- no people. <br /> <br />4. Warning Time: Warning time of as little as 30 minutes can be enough to <br />implement property protection measures. State, county or local emergency <br />managers should be contacted to obtain these times so they may be incorporated <br />into the plan. <br /> <br />5. Repetitive Loss Areas: Repetitive losses account for 1/3 of all NFIP flood <br />insurance claims. Areas of repetitive loss should be identified. Such information <br />can be obtained from FEMA's Regional Offices, <br /> <br />D. Problem Assessment <br /> <br />A systematic inventory of everything located in the flood hazard area is needed to insure <br />that all potential problems are addressed in the Local Pre-Disaster Flood Hazard Mitigation Plan. <br />Development trends and development constraints should be included in the plan. Because of map <br />inaccuracies, areas near the flood hazard area should be looked at closely as well. <br /> <br />1. Land Use and Buildings: An inventory should describe how the community's <br />flood hazard areas have been developed and how many building are affected. <br />Community land use maps can be helpful in identifying these areas. A count of <br />the buildings affected by flooding is essentiaL Windshield surveys or aerial photos <br />can be used to accomplish this task. Any flood damage data for buildings which <br />is available from previous flood events will be helpful to assist in project <br /> <br />9 <br />
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