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FLOOD08571
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Last modified
1/25/2010 7:14:56 PM
Creation date
10/5/2006 3:44:44 AM
Metadata
Fields
Template:
Floodplain Documents
County
Larimer
Community
Fort Collins
Stream Name
West Vine Drainage Basin
Basin
South Platte
Title
Major Drainageway Planning
Date
12/1/1980
Prepared For
Fort Collins
Prepared By
Engineering Professionals
Contract/PO #
&&
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />LD. <br /> <br />Reconnaissance <br /> <br />Cross-sectiOns for use in the hydraulic analysis were either <br />field surveyed or interpreted from the topographic mapping. <br />Approximately 94 cross-sections were used for the hydraUlic <br /> <br />During the course of this study many on-site investig~tiQns were <br />made to gain familiarity with the drainage basin and to gather <br />field data for the analysis. During these investigations, <br />photographs were taken during minor storms documenting flood- <br />prone areas. These photos are <lvililable in the Technical Addendum. <br />Photographs were also taken along the various reaches to aid in <br />determining Manning's Roughness coefficient ("n") for use :).n the <br />hydraulic analysis. These photographs are con~ined within a <br />separate "Manning's "n" Value Verification" report which is <br />on file with the City of Fort Collins. Field surveys were <br />conducted to verify topographic mapping, measure existing <br />drainage structures, aid in determining complex drQinage patterns, <br />and determine first floor elevations of flood prone residences. <br /> <br />analyses. <br /> <br />Of these, 44 were fiold surveyed. <br /> <br />J.F. <br /> <br />Previous Studies <br /> <br />various drainage <br />for areas within <br />where possible. <br /> <br />studies and roports which have been prepared <br />the drainage basin were reviewed and utilized <br />These studies include: <br /> <br />I..ociltion Mappino Consultant Fll.'lht Da!:,.€- <br />5'''....., Sec. 2 !,RIX April, 1980 <br />"" Sec. 1 ARIX April, 1980 <br />S\, Sec. , A!UX April, 1980 <br />E'" Sec. 7 AR!X June, 1979 <br />Sec. , ARIX June, 1979 <br />Sec. 9 M , 3 consulting Engineers May-July, 1978 <br />NE,N\-.I , ew " , , , consulting I'>ngineers Ndy-July, ,".,~ <br /> ~~'o <br />Sec. 10 <br />NE,NW , EW '" M , , Consulting Engineer-s May-July, 1978 <br />Sec. 17 <br /> <br />1. "Report on Storm water Drainage Facilities for <br />Fort Collins, COlorado"; Black and Veatch Consulting <br />Engineers: June, 1971 <br />2. "College Lake Improvements Study": colorado State <br />University; octoh<'r, 197fi <br />3. Hanna Subdivision Drainage Calculations: James H. <br />Stewart and Associates; June, 1977 <br />4. Grilnad<l Heights Subdivision Druinage CalCUlations; <br />James H. Stewart und I\SBociates; June, 1979 <br />With the exception of the Black and Veatch study, all studieg <br />indicated were prepared for reldtiv~ly small, individual sub- <br />catchments. In uddition, method~ of d~termining rates of runoff <br />~iffcred ~ignific~ntly fro~ the Stormwater Mdndqement Model used <br /> <br />I.E. Muppinq and Surveys <br />Topographic mapping used to delineate and ~Qdel subbasins for <br />the hydrologic analysis and prepare cross-sections for use in <br />the hydraulic analysis was furnished by the City of Fort collins. <br />The quarter-section maps used throughout the study, all of which <br />are in Township 7 North, R.:mge 69 w~.st, are listed as follows' <br /> <br />to prepare this study. <br />virtually meaningless. <br />hydrograph approach to <br /> <br />Therefore, comparison of results was <br />The Black and Veatch study used a unit <br />determine rates and '/olm"e'" nf nmoff. <br /> <br />Agai.n, il meaningful comparison does not present itself because <br />di.fferent deSign rainfalls and different loss parameters were <br />used for the Black ~nd Veatch study. None of the $tudies listed <br />delineate floodplains. caplE'S ot the aforeu1t!utio"",u >;tclui<Js <Ire <br />on fil~ with the City of fort collins. <br /> <br />Vertical control informdtion relative to the mapping and floodplair. <br />inforpation ?rovided in this study is available through the City <br />of Port Collins. <br /> <br />-3- <br /> <br />+ <br />
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