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Last modified
11/23/2009 1:02:55 PM
Creation date
10/4/2006 9:51:31 PM
Metadata
Fields
Template:
Floodplain Documents
County
Pueblo
Community
Pueblo
Stream Name
Fountain Creek
Title
Pueblo Flood Control Project
Date
1/1/1990
Prepared For
Pueblo County
Prepared By
US Army Corps of Engineers
Floodplain - Doc Type
Project
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<br />creek and was constricted at the AT&SF Railroad overpass at Joplin Avenue. . <br />The flow continued downstream of this point and spread out further to the east ~ <br />downstream of the Missouri Pacific Railroad. The flows were rejoined it: the <br />Arkansas River below the mouth of Fountain Creek. <br /> <br />3-14. Excavation. The recommended plan in the Phase I repo'rt showed it tie- <br />back levee On the east side of Fountain Creek along the Missouri Pacific <br />Railroad which tied into a ground elevation that is 5 feet lower thilU the <br />bridge embankment. With the Phase II design, the levee will tie directly into <br />the bridge embankment, since it is the only point with adequate elevs,tion. <br />The water surface elevation upstream of the Missouri Pacific bridge ,,,as at <br />approximate elevation 4658.0 in the Phase I study. The left abutment (,f the <br />bridge is at elevation 4655.2, which is also the elevation that the leve,e must <br />meet. The primary objective was to lower the water surface elevation to <br />4653.5, 1.5 feet below the MPRR, at the upstream side of the Missouri P.acific <br />bridge. Various excavation alternatives were explored, inc Iud ing extE,nd ing <br />the excavation limits downstream to Highway 227. The Phase I channel <br />improvement included excavating the entire section down to the channel d,esign <br />invert. Compliance with recommendations of the General Design Conf,erence <br />limits excavation to 3 feet above the active channel invert. An elevation of <br />4653.5 at the Missouri Pacific Railroad was attained by starting excavat:i.on at <br />Station 105+40, which is approximately 1,450 feet downstream of the Missouri <br />Pacific Railroad bridge. By comparison, channel excavation prQPosed-in~~the- <br />Phase I report began approximately 750 feet upstream from the - AT&SF Railroad <br />bridge. Since this excavation was down to the channel invert, the excantion <br />quantities were not increased by lengthening the excavation li'mits. . <br />Excavation limits are shown on Plates 4 to 6. <br /> <br />3-15. Levees and Channel Slope Protection. Levee alignments are shown on <br />Plates 3 through 6. Typical channel cross sections on Plates 7 through 11 <br />indicate the reaches requiring channel slope and levee slope protection. <br />Where channel excavation is required, channel side slopes are graded to a <br />slope of IV to 2.5H. Levee side slopes are lV to 3H On the stream side. A <br />shear analysis was performed to size the stone required to resist the e~rosive <br />forces of the design flow for these side slopes. Required rip rap thickn,esses <br />vary from 12 inches to 42 inches (velocities range from 8 to 20 fps) in <br />accordance with design criteria from ETL 1110-2-120. Riprap will extend 5 <br />feet below the existing thalweg elevstion to protect the levee toe from <br />potential scour where there is sufficient vertical distance between existing <br />thalweg and the bank protection. Required stone sizes and weights f,)r the <br />varying thicknesses are presented in Section V, Construction Materials. <br /> <br />3-16. Detailed topographic mapping revealed a high east bank with a ve:rtical <br />drop into Fountain Creek between 4th and 8th Streets. Existing businesses <br />create a confined area in which to p lace a levee. An earthen levee "ithin <br />this reach would extend halfway into the low flow channel, severely reducing <br />its capacity. This would require excavation on the west side of the crl!ek of <br />an equivalent area to make up for the lost capacity. The recreation area <br />planned on the west side would also be affected by the necessary excavation. <br />Consequently a soil cement levee will be placed on the east Dank from Sta <br />28+20 to the 4th Street bridge and from Sta 18+20 to the 8th Street bddge. <br />The soil-cement levee will consist of side slopes of IV to 1.5H and will ~~ <br />extend 6 feet below the existing channel bottom to protect its toe from <br />potential scour. The flow area reduced by the soil cement levee is negligible <br /> <br />III -4 <br />
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