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<br />Spillway:
<br />Location
<br />Type
<br />,lain section:
<br />Crest elevatien, feet
<br />Bottom width, feet
<br />~otched section:
<br />Crest elevation, fect
<br />Bottom width, feet
<br />Design discharge, c.f.s.
<br />Side slopes
<br />
<br />Westabutlllent
<br />~otched conCrete ogee
<br />
<br />top of the dan embankment. Excess energy froJ:l flOh.S released through
<br />the outlet works would be dissipated by a flip bucket at the lower end
<br />of the eonduit. A riprap bIanket, S feet deep and 2S feet long, would
<br />be placed in the outlet channel at the end of the stilling basin for
<br />erosion protection. Plans, profiles, and sections of the outlet works
<br />are shown on Plate 3. A conduit discharge curve is shown on Plate 4.
<br />
<br />TABLE I. h (Cont'd)
<br />
<br />4,919.0
<br />2,187
<br />
<br />6. SPILLWAY.- The spillway would be located in the right abut-
<br />ment On Pierre shale which would provide a competent foundation. The
<br />spillway would consist of a concrete ogee section with a total length
<br />of 2,727 feet. A S40~foot long notch would be located in ~he center
<br />of the ogee section. With storage in the reservoir at J:laXlmum water
<br />surface, discharge oVer the weir would be S80,OOO c.f.s, A 1,000-foot
<br />long wing dike "ou1<l lJe constructed on the east side of the spi11way
<br />outlet channel to insure that flows do not erode the downstream face
<br />of the dam. Plans,sections,profiles,andadischargecurveforthe
<br />spillway are presented on Plates 2 and 4.
<br />
<br />4,915.0
<br />540
<br />S80,000
<br />lon2.S
<br />
<br />Outlet Works:
<br />'''''
<br />Maximum discharge capacity,
<br />Terminal energy control
<br />
<br />1'-
<br />c.f.s.
<br />
<br />diameter gated concrete conduit
<br />7,200
<br />Flip bucket
<br />
<br />7. COIISTElUCTION !1ATEElIALS.- ~'ithin the reservoir area above the
<br />active flood pIain, clay, sandy clay, and silty clay materials over_
<br />lying thc Pierre shale are available in unlimited quantities~ These
<br />mdterials would he ade~uate for impervious or random fill. bxcellcnt
<br />granular materials are availalJle within the reservoir area in the
<br />flood plain of Fountain Creek. These granular materials exist in
<br />ample quantity and quality to be used for rand~ and pervious fill
<br />materials and may be processed into adequate filter material. Terrace
<br />deposits en the "est abutlllent, west of existing U.S. Interstate Highway
<br />2S,wouldbesuitablefor random fill material. Both coarse and fine
<br />concrete aggregate are availabie from commercial sources in Pueblo.
<br />Reconnaissance of surrounding areas revealed two potential sources of
<br />riprllp. t.imeStOM is exposed in a quarry about IOmiles south of the
<br />dlllllsitc and another potential SOurce is a limestone outcrop located
<br />about 10 Rliles northwest ofthedamsite. Future design studies will
<br />include consideration of soil cement for upstream slope protection.
<br />
<br />4. DAM E11E1ANL~ENT._ The ~bankment would be a :oned section con_
<br />sisting of a central impervious core, a random fill :one downstream,
<br />and a pervious fill :oneupstre3.ln. Seepage wouldbc controlled by the
<br />central impervious core, a cut-off trcnch to Pierre shale, and down-
<br />stream internal drainage blankets. Dumped riprap slope protection, 18
<br />in.ches thick, would be provided On the upstream face. Selective place-
<br />r..ent of borroh' l.1aterials would elilllinate the need forslopeprQtection
<br />on the do~.nstrea'l face of the dlllll. A typical section of the embankment
<br />is shown on Plate 2. Available data indicate the embankment in the
<br />floodplain areawouldbc underlain by about 20 t04(Jfeet of highly
<br />pervious alluvial flood plain material. The flOOd plain deposits are
<br />underlain by relatively impervious Pierre shale to great depths. The
<br />foundationoverburdellmaterialsandPierreshaleh'ouldprovidea
<br />competent foundation for the proposed structure.
<br />
<br />8. RELOCATIOns.. cOnstruction of Fountain Reservoir Project
<br />would require relocation of 7.6 miles of the Denver and Rio Grande
<br />WesternRailroad,6.101i1esoflJ.S. InterstateHighway25,6milesof
<br />county roads, and 4 miles of power lines. Plans of the relocations
<br />are shown on Plate 1. Details of the railroad and Interstate Highway
<br />relocations are given On Piate 5. Details of the county road relocation
<br />are shown On Plate 6.
<br />
<br />5. OUTLET ilORKS._ The ootlet works would consist of an approach
<br />channel, intake Structure, conduit, vertical lift control gatu, con-
<br />troltower, terminai encrgydissipater, and outletchanllel. The outlet
<br />works would be located to the west of th~ Streambed on Pierre shale
<br />bedrock which wouldprovi<.le an lIdequate foundation. The conduit would
<br />be a 12-foot diameter circular concrete structure. With water surface
<br />atspillwaycrest,theconduitwoulddischal'"ge7,200c.f.s. Atran_
<br />sition section would be located in the conduit at the base of the co n-
<br />trol tower to accommodate the hydraulic eontrel gates. Two service
<br />gates with two emergency gates located upstream from the service gates
<br />woul~ be provided. The control tower, located at the upstream end of
<br />the conduit, would house electrically contrOlled hydraulic gate oper-
<br />ating machinery Acce~s t~ the tower "ouid be by a bridge ftam the
<br />
<br />9. RECRe~TI0N FACILITIES.~ Recreation facilities, consisting of
<br />picnic tables and shelters. camping units, water supply and sanitation
<br />facilities, roads, trails, parking areas. boat launching ramps, a bellch_
<br />changehouse, a visitor center, and related facilities would he provided
<br />for beneficial use of the permanent pool and reservoir lands by the
<br />pubiic.
<br />
<br />1-'
<br />
<br />1-3
<br />
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