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<br />I.D.
<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 ("nn) for use J,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 />analysi.s,
<br />
<br />Of these, 44 were fiold surveyed,
<br />
<br />I.F,
<br />
<br />Previous Studies
<br />
<br />various drainage
<br />for areas within
<br />where possible.
<br />
<br />studies and reports 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 />". See, 3 ARIX April, 1980
<br />5\, See, , A!UX April, 1980
<br />E', See, 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 EngineelCs May-July, 1978
<br />See, 17
<br />
<br />1. "Report on Storm water Drainage Faciliti.es for
<br />Fort Collins, COlorado"; Black and Veatch Consulting
<br />Engineers: June, 1971
<br />2. "College Lake Improvements Study": colorado State
<br />University; Octob<,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 determining rates of runoff
<br />~iffcred ~ignific~ntly fro~ the Stormwater Management 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 />Again, il meaningful comparison does not present itself because
<br />different deSign rainfalls and different loss parameters were
<br />used for the Black and Veatch study, None of the $tudies listed
<br />delineate floodplains. COplE'S ot the aforeu1t!utio"",u t;lcIJi",s <Ire
<br />on fil~ with the City of fort collins,
<br />
<br />Vertical control informdtion relative to the mapping and floodplair.
<br />information ?rovided in this study is available through the City
<br />of Port Collins.
<br />
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