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FLOOD00311
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Last modified
11/23/2009 10:50:45 AM
Creation date
10/4/2006 9:12:49 PM
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Template:
Floodplain Documents
County
Statewide
Community
Rock Rapids, Iowa
Title
Rock Rapids, Iowa Technical Assistance Study Backup Data
Date
9/1/1995
Prepared For
US Army Corps of Engineers
Prepared By
Greenhorne & O'Mara, Inc.
Floodplain - Doc Type
Data (general)
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<br />SITE C <br /> <br />SITE C <br /> <br />Location <br />. Private ring levee near East street near proposed levee alignment #2 as shown on plate I of <br />problem identification <br /> <br />Orielnal Scope of Work <br />. Evaluate existing levee (assess levee integrity and reliability) <br />. Level of Protection (assuming meets Corps criteria <br />. Effects on Existing conditions of flood boundaries <br /> <br />Background information <br /> <br />Area Description <br />. Ring levee encloses two residential structures owned by the Stewart family <br />. Surrounding areas to South, North and West are open land <br />. Property bounded by East Street to the East <br /> <br />Flooding 1993 <br />. Water reached the top of the foundation flooding the basement, but never reached the <br />main floor <br />. Levee was constructed due to the 1993 flooding <br /> <br />Levee Construction <br />. Levee was constructed after 1993 flooding <br />. Levee permitted by the Corps, SCS, ONR & ASCS <br />. Levee inspected by Corps after completion <br />. Levee approximately 5' -6' higher than existing ground with concrete toe at center of <br />levee (approximately three feet deep) <br />. Levee compacted using Scraper (Cat) and 3 yard front end loader <br />. Levee material taken from surrounding area <br />. Slope oflevee is vegetated <br />. Levee starts near East Street to South of property and ties into a hill on the Northwest <br />side of the property <br />. Verbal account from Stewart's claim levee constructed to 1000yr L.O.P. <br /> <br />Hydraulics <br /> <br />lOO-yr flood event <br />. Inspected and approved. Permit claims no impact to 1 OO-yr water surface elevation_ <br /> <br />500-yr flood event <br />. Inadequate information to determine location of cross section or cut new cross <br />sections due to mapping inconsistencies. <br /> <br />SITE C - page I <br />
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