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FLOOD03130
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Last modified
1/25/2010 6:26:24 PM
Creation date
10/4/2006 11:28:29 PM
Metadata
Fields
Template:
Floodplain Documents
County
Statewide
Community
Statewide
Stream Name
All
Basin
Statewide
Title
Flood Proofing Technology
Date
4/1/1994
Prepared For
State of Colorado
Prepared By
US Army Corps of Engineers
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br /> <br />use of textured surfaces and graphics on the floodwalls, <br />use of the evacuated flood plain areas for replacement of <br />wildlife habitat lost during consbUction of the floodwalls, <br />landscaping of floodwall easements, and provision of the <br />nonstructurai measures to eligible flood plain residents on <br />a sbictly voluntary basis. These features have been very <br />successful in the implementation of the Section 202 pro- <br />gram in the Thg FOlK Valley. <br /> <br />Project Implementation <br /> <br />Upon completion, the comprehensive basin-wide plan <br />was submitted to the Office of the Assistant Secretary of <br />the Anny for Civil Works for review and approval in 1982. <br />Based upon that review, the comprehensive plan was <br />divided into 15 separate, geographically defined project <br />areas that could be independently approved, funded and <br />implemented. Since that time, three of the 15 project areas <br />(Williamson and Matewan, West Virginia, and South <br />Williamson, Kentucky) have been approved forimplemen- <br />tation and are in various stages of consbUction, <br />A total of 946 structures including 689 residences and <br />257 commercial sbUctures are being protected by struc- <br />tural floodwalls in these project areas. Another 470 <br />structures including 400 residences and 70 commercial <br />structures are being protected by nonsbUctural measures <br />in these three project areas. <br />In accordance with the provisions in the Section 202 <br />legislation, a local cooperation agreement (LCA) was <br />executed with the local sponsorpriorto the implementation <br />of each approved project area. The LCA required that: <br />I) the local sponsor operate and maintain the con- <br />structed project; <br />2) the local sponsor participate in the National Hood <br />Insurance Program and enforce the required ordinances; <br />3) the local sponsor operate an approved Hood Wam- <br />ing and Emergency Evacuation Plan in the project area; <br />and <br />4) the local sponsor manage evacuated flood plain <br />lands set aside for wildlife habitat in accordance with a <br />jointly prepared management plan. <br /> <br />Nonstructural Planning <br /> <br />As discussed above, the nonstructura1 program consisted <br />of the flood proofmg of eligible structures and the acquisi- <br />tion of flood plain structures which could not be flood <br />proofed under the program criteria. Both of these options <br />were provided on a voluntary basis to flood plain residents <br />in approved project areas. In all cases of the nonsbUctural <br />program, potential participants were provided with the <br />option of not participating in the program and maintaining <br /> <br />their existing flood plain residence under the local flood <br />plain management ordinance. <br />In an effort to infonn the public about the features of <br />the plan and the options available under the nonstructural <br />program, a series of workshop meetings and public hear- <br />ings were held at churches and schools throughout the lUg <br />Forte Valley during the fonnulation process, The ongoing <br />success of the overall plan and the participation rates <br />experienced in the nonstructurai program have been a <br />direct result of those early public involvement activities. <br /> <br />Flood Proofing Options <br /> <br />Under the nonsbUctural program, sbUctures located in <br />the flood plain that would suffer damages to the fi rst <br />habitable floor during a recurrence of the April 1977 flood <br />were eligible for either voluntary flood proofmg or ac- <br />quisitiolL Eligibility for flood proofing required that: <br />1) the sbUcture would suffer damages to the first floor <br />or to mechanical systems below the first floor during a <br />recurrence of the April 1977 flood; <br />2) the sbUcture not be located within the regulatory <br />floodway (the channel of a river or other watercourse and <br />the adjacent land areas that must be reselVed to discharge <br />the base flood without cumulatively increasing the water <br />surface elevation more than a designated height); <br />3) raising the sbUcture to an elevation I foot above the <br />April 1977 flood level would not place the first floor more <br />than 12 feet above the ground surface; and <br />4) the structure was physically sound and could be <br />raised safely. <br />The method chosen for flood proofing was based upon <br />engineering feasibility and cost -effectiveness. The options <br />available for flood proofing included the following: <br />I) elevation on a solid masonry wall foundation or <br />wood postJbeam foundation or masonry pier foundation; <br />2) consbUction of a waterproofed veneer wall against <br />the sbUcture with sealed openings at entrances; <br />3) consbUction of floodwalls or levees around an <br />individual or group of sbUctures; or <br />4) consbUction of a replacement flood proofed struc- <br />ture on-site. <br />Although all of these options were available in the <br />program, oniyoptions 1 (elevation), 2 (veneer wall), and 4 <br />(replacement flood proofed structure) were implemented <br />in the program. Only structure elevation and the veneer <br />wall project are discussed in this report. Based upon <br />research of flood proofing techniques, it was decided that <br />elevated structures would allow flooding of the enclosed <br />area beneath the raised first floor. <br />In those cases where the cost to flood proof an eligible <br />residential sbUcture, plus the standard relocation benefits, <br /> <br />3 <br />
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