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FLOOD04664
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Last modified
1/25/2010 6:46:54 PM
Creation date
10/5/2006 12:49:21 AM
Metadata
Fields
Template:
Floodplain Documents
County
Logan
Community
Sterling
Stream Name
South Platte River
Basin
South Platte
Title
Flood Mitigation Measures for South Platte at Sterling
Date
9/1/1979
Prepared For
Sterling
Prepared By
US Army Corps of Engineers
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />Table 5. A comparison o:f t.he floodway oui:line!3 for existing and cleared <br />chailnel conditions OIl Plates 3 and 4, show that the floodway was narrowed <br />sliq'htly by 1:he channnl clearing. Thl2' reduction in water surface elev.ations <br />and floodway area was genera.lly not lan;'e ~~nough to :Xlake this a viable flood <br />mitlgation moasure. <br /> <br />3.5 Channel ImprclvemE~nt <br />conl3idered in this Eltudy. <br />Pla1:te Rivel~, the channel <br />option because of it: 1::: need <br />and sand bars. <br /> <br />Option. A channel imp.r:ovemEmt option was not <br />Becausl':! c f -~:he brai.ded nature of the South <br />improvement opt:ion vlas not considered a viable <br />for continual maintc-manct2' to remove vegetation <br /> <br />3.6 AltE!rnative I,eveE! Option~ An <:d.te:cnative to the proposed levee <br />by the City of Starling is to build a ll:1!vee just outside of -the existing <br />conditions floodway !It.own on Plate :3 and 4, The levee alignment generally <br />toL.ows the proposed city levee alignmen.t \-,here possible. A short dashed <br />linE! on the left bank shows where the lev'€!e depart from this alignment. A <br />short dashed line on the right bank 9hov19 "'here the floodway for this option <br />departs from the exiElting conditions flooch.'l-Iay. Thiu levee placement would <br />not provide the cit.y wit;h as much land ar: protected by the city proposed <br />levE!e alignme!nt, but would offer protBct:i()E 1:0 a major portion of 1:hat land. <br />A 100-ye~ar levee conEltruct:ed :for thiB option should be cons1:x,.ucted at <br />leaEit as high as the floodway wattu:, Burfa.cE~ elevations in Table Four with an <br />additional three feet of freeboard,. <br /> <br />3.7 Floodway Mitigat.ion '!,>lith Levee Or;ti.on. Anot:her option would be to <br />build the proposed city leveE~ aIld t;hen calculate a new floodway with the <br />levE!e in place. The right bank E!ncroa:hmentEJ were widened all the way to <br />the county road, but failed to maintain ,3. 1.0' or leEIS rise in the floodway. <br />OnCE! that option had. failed, the left :Junk encroachments for the floodway <br />were' then widened until an aligrunen:t 'Wit:h a 1.0' or h~ss rise was <br />calculated. The floodway for this o:ption was calculated and the outlines <br />are shown on Plates 3 and 4. A floodNay data t.able for this opt:ion in shown <br />in Table Six. This option may 1:"E~quire negoti.ation!:! for cornpensat:ion with <br />the land owners on the right: bank and upst.ream whose land would be <br />susceptible to increased flood elevati..on~3. <br />A lOO-year levee construct.eel :for 'l:h.iEl opti.on should be c()nst.ructE~d at <br />least as high as the floodway wat;er SUr.:EiiCf' E~lE!vati.ons in Tabl~~ Four with an <br />addi tional three feet of trel:board. <br /> <br />7 <br />
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