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VOLUME I - PRELIMINARY ENGINEERING DESIGN TABLE OF CONTENTS SECTION DESCRIPTION I INTRODUCTION.... . Purpose of the Study Special Issues.. River Flow. ... River ManagPment. Study Reaches. ... PhaseA...... . II STUDY AREA OESCRIPTION. GeograohlcLocation. . Historical Perspective Geologic Setting Previous Studies III HYDROLOGY . . . . . Flood Control Storage OralnaqI'Basin... . Peak Flows. ...... Average River Discharqe Groundwater..... . Water Rights. . . . . . ~'tdge Plant ilischarges IV HYORAULICS AND SEDIMENTATION. Hydraulic Analysis .... E~istinq Conditions. . Split Flo" Calculations Dams......... . ImprovedConditinns. . Historical Flooos..... Sedimentation and Erosion. Erosion...... . Impacts of Erosion. .... Eff~t of Recomnended Plan. V FLOOD PROBLEMS. . . . . . . . . . Reach 1: Chatfield to Collllllhine Valley. Reach 2: ColLnbine Valley to Oxford Redch 3: O~ford to Bates. Reach 4: Bates to r~lfa.. Evans Avenue. ..... VallejotoColfax.. . flthAvenue...... . Reach 5: Colfax to Chf'rryCrpek SECTION "" I-I 1-2 1-3 1-3 1-3 1-' 1-' VI II-I 11-1 II-I II-I II-I 111-1 IlI.I III-l Ill-I 111-2 111-4 111-6 111-6 VII IV-I IV_l IV-I IV-l IV-l IV-2 IV-2 IV-2 IV-3 IV-3 IV-3 VIII V-I V-I V-I V-I V-I V-I V-I V-2 V_I u TABLE OF CONTENTS (Continued) DESCRIPTION Reach 6: Cherry Creek to Franklin. Reach 7: franklin to Sand Creek. . Reach 8: Sand Creek to Baseline Road MASTER PLAN DEVELOPMENT. Introduction. . . Phase A Study. .. Purpose. . . . . . Goals...... . Alternathes Evaluated Phase 8 [}irection. .. .......... Reachesl,2,3,and4 Chatfield to CoHax ReachS-CoHaxtoCherryCreek.... . Reach 6 and 7-CherryCreek to Sand Creek Reach 8 - Sand Creek to Baseline Road. PhaseBPlan........ . Reach 1 - Chatfield to Columbine. Reach 2-Columbine to Oxford .. Reach 3-Oxford to Bates .... Reach4-BatestoColfax... . Reach 5 CoHaxtoCherryCreek. Reach 6 Cherry Creek to franklin. Reach7-FranklintoSandCrcek.. . Reach 8 _ Sand Creek to Baseline Road MASTER PlA" COSTS. . . . . . . Introduction. . . . . . . . Unit Costs. . . . . . . . . OrainageImprovementCosts. Street Crossing Costs .. lJti 1 ity Relocation Costs. . Total Construction Cost .. Contingency. . . . . . . . Propertyl\cquisitionCosts. Maintenance. . . . . Cost of Alternatives. CRITERIA...... . Introduction. . . . Planning and Design Criteria. RESOURCES..... . Mineral Resources VerdosGravels Slocll11 Gra.vels ...... O1::ler Eolian Sand and Silt Broadway-LouviersAlluvium PineyCref>kAlluvilJ1l.. . Younger Eolian Sand and 5ilt PAGE V-2 V-2 V-2 VI-l VI-l VI-l VI-l VI-3 VI-3 VI-3 VI.4 VI_4 VI-4 VI_4 VI-5 VI-5 VI-5 '11-5 Vl-5 VI-6 VI-6 VI-6 VI-6 Vll-l VII_l VII-! VII.2 V11-2 VII-3 VII-3 Vll-3 Vll-3 Vll-3 V!l.4 Vlll-l VlII-l VIII-l IX-I IX_1 1X.1 IX-! IX.l IX-I lX-l IX.2