My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
FLOOD08469
CWCB
>
Floodplain Documents
>
Backfile
>
8001-9000
>
FLOOD08469
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
1/29/2010 10:15:24 AM
Creation date
10/5/2006 3:40:07 AM
Metadata
Fields
Template:
Floodplain Documents
County
Denver
Jefferson
Adams
Community
Denver, Jefferson County
Stream Name
South Platte River and tributaries
Basin
South Platte
Title
Major Drainageway Planning South Platte Phase B, Volume I
Date
11/1/1985
Prepared For
Denver
Prepared By
Wright Water Engineers, Inc.
Floodplain - Doc Type
Floodplain Report/Masterplan
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
149
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
<br />I <br /> <br />'-3 <br /> <br />I <br />I <br />I <br />I <br /> <br />Deg~adat ion upstream of the bridge of approximately 4 feet has. to some <br />extent,rnitigated the flooding problem. From Sand Creek to 1-76thechan_ <br />nel is confined by levees approximately 400 feet apart. Theoverb,lnkareas <br />outside of the levees are sU'iceptible to shallo.. floodinq during the 100- <br />year eyent. Aetween 1.76 and East 74th Avenue the overbank areas are mined <br />and the levees are, for the most part, ineffective. <br /> <br />From East 120th Avenue to East 136th Avenue the river is sinuous and braid. <br />edwith no significant levees confining the flows. This reach passes east <br />of the Mam<; County Regional Park. The floodplain consists primdrily of <br />dgricultural land and gravel mining operations. From East 136th Avenue to <br />Baseline Road the river and flOOdplain Jre essentially natural. <br /> <br />I <br />I <br />I <br /> <br />from Steele Street to East 88th Avenue the river is confined by levees on <br />the east side and natural topographic features on the left. The City of <br />Thornton controls the bulk of the floodphin hnd and has municipal >later <br />storage faci11tles outside the levees on the east side. Do>lnstreamofthe <br />storage fad 1 it i es the 100-year f1 ood fl,,>IS overtop to I evooes and o~er <br />12,000 cfs leaves the channel and flows overland to 88th Street. These <br />flo>ls re-enter the main body of flow downstream of 88th Street. O~ertop- <br />ping may bf> due in part to 3 feet of channel ag9radationupstreamofEast <br />88th Street resulting from the construction of a 4 foot drop. <br /> <br /> <br />frQll1 East 88th A~enuf' to Basel inf' Road the overbank fl aadino is duf' pri_ <br />'Mrily to Insufficient channel capacity. The East I04th Avenue and East <br />160th I\~enue bridges Jre of 1 ess than 100-year capacity, but they do not <br />have a large impact on the exteot ofoverbilnk flooding. !ngpneral, this <br />reach has deqraded approx imately 4 feet I(/i th the exception of the ri~er <br />irrmediatelyupstreamof the 8rantner Ditchdiversiondillll.mich has aggraded <br />2 feet. <br /> <br />from East 88th Avenue to East l04th Avenue. the river is confined by <br />levee~, '11any of >lh i ch are assoc i ated >lith gra~e I min i ng operat ions. The <br />levee, dre abo~", the lOO-Yl'ar >later surface ele~ation, but di scontinuities <br />result in significant flooding outside the levees. <br /> <br />JUNE 1955 FLOOD. An eXilIllpleof dcommon flood problem along !\\<lny <br />reaches of the ~outh Pl atte River i ~ i nsuffi ci ent channe 1 capac ity <br />and debris blockage as demonstrated by this picture of the June 1965 <br />flood showing an area near Alameda A~enue. <br /> <br />The river bet >teen East 104th A~enlle and Adilllls County Regional Park (East <br />120t~ Avenue extended) is generally braided and unconfined. The floodpl ain <br />limitsdredefinedbythenatural topography rather than levees. <br />
The URL can be used to link to this page
Your browser does not support the video tag.