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<br />TABLE OF CONTENTS
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<br />Page N"
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<br />Letter of Transmittal." ,............,.... ,.. ,.... ...,., ......""........, ...,.... ,........,.,....,..,........,.... ..........,.."."... ........,.... ,.'
<br />Title Sheet ....,. ,......... ,.. ..,...... ,. ..... ,....... ,...... ,....,......,..."........"", ,..,..,.....""" ,.....,.",..",...."..........,...... "'. "'."
<br />Table of Contents ,........ ........,. '.'.... ..,.............,............,..,.,...,..".."..,....,.. ,...,...".......""" .......',.. ,............ "'...:
<br />List of Tables.......,......, .."'.... ,............,..."'.. "'.... ...,. ,................."." ,................,.. ,..,....,.....".,..,... ,..,..,.....,.... ~
<br />List of Figures..., ,....",.. ,....,...........,...,..."..."",... .....',.. "'..........,....,.,..,...,...,. ''''....'...'..... ......".... .."',....".,.. ,
<br />List of Appendices..... ,............. ,......,... ,.."....,.. ......".......,......,.......,.,..,.,.."....,.",............,.., "',..,....,.,.. .......,,'
<br />Acknowledgements.....,...,',... ,..,.......,....."" ,...,..,.. ..... ...........'....................,........ ......,.,......,.., ,....... '..". ....., II
<br />Executive Summary .......................................................................................................................... ES-l
<br />South Platte River to Brighton Road ......................,.....'.........'..............,................."'...........................3
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<br />~~~:~Ot~ ~~~~i: ~~~ ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::~
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<br />O'Bn'an Canal to 96th Avenue " ..,.,......"'...."'.......3
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<br />Direct Flow Tributary ......,...,......,..,..,.... ,.. ,......",..... ......,........",..,......"..,.",. ,......... ,.....' "',.., ....... ...., .....5
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<br />E5~t~::;=il
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<br />Wolpert Tributary"""",.",...""",.""."""."""".",........,...",.,.",.".,..,...."..,.""..,.."",.""."""."", """,.",5
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<br />Summary. ,,' ,,' """ '" ". "," ",." ." ,.." "",."" '" "",..."..".. ,.""." ""...',,'. '..' ,.'... .,.... '" ""'" .,.". ,..', ",."""..",.",5
<br />I. INTRODUCTION ....................................................................................................................................1
<br />A, STUDY AUTHORIZATION AND PARTICIPATION ...,.........."'....."',.........................................1
<br />B PURPOSE AND OBJECTIVES ......,............"'.."'....1
<br />C: ACKNOWLEDGEMENT OF D'ES'i6'N''CiUT'ERlA:::::::::::::::::::::::::::::::::::::::::...."''''..,.............,....1
<br />D. PROJECT HISTORY AND CORRESPONDENCE............................................"'.."'..................,..I
<br />E. SUMMARY OF DATA OBTAINED....,......................................................................,....,..............3
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<br />F PREVIOUS STUDfES .. .......,......,.................."'....,"''''......'''.......................'''....,'''3
<br />II. DESCRIPTION OF STUDy'A'REA:::::::::..::..........................................................................................4
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<br />A. LOCATION ...,.....,..... .,."",.......,..,..,.......,.....""..,..........,.,..,....,...............,....,..........., ,....",...............,4
<br />B MAJOR DRAINAGE BASINS ........................4
<br />, First Creek,....... ,..,.. ....... ,.. ,.. .........:::: :::::::: :::::::::::: :::: :::: ::::::::: ::: :::::: ::::::::: :::::: :::::::: :::::::: ,..,...,........,..,...,4
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<br />Direct Flow Area (DFA 0055)........,'........,..........,.....""......."'......"........,.......,,.."..,........,..,.................4
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<br />C. SOlLS "..,..,............ ....,.....,.,........'...... .......... '" .......,., ,.. ."'....". ,.... ,.. ,.. ,.................. ,.... ,.......",." ........,,4
<br />D VEGETATION ........,............,....,...."''''..,......,.,.....,...."....,........,..,...,....,..,..,....,......., ........,..."..,......,4
<br />E: WATERSHED IMPERVIOUSNESS ..,..".....'..,..."',"'.,....."'........................"',.."...,.",..,...,....,.,..",4
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<br />F FLOOD HISTORY ,.."............,......,..,..".,.,...."....,..,.......".....,....,..........."'''''''.........,4
<br />G, WETLANDS .,..,.,.,::::::::::::::::::::::::..",...,...,.""."",..",'.'.',.",.,.".,."",.""".','..""""",..,."""...,..,.,....,4
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<br />H, GROUNDWATER ",..........,......,.,..................''''.,.....,........,....,........,.....,...........,..,..,.......,..,.............5
<br />L UTILITIES, ".." '" ".,...." ..'" """" .','.', "".,., ,',', ,." ". ,.., "...,.,., ,. ,. ,. "."" ,. ,. ". ,... ,.. ,.,.." ..'.... "".",. ,'.' ,,' "".5
<br />III. HYDROLOGIC ANALYSIS ................................................................................................................10
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<br />~: ~~~~Js'STUDi'ES'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: ~
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<br />c. DESIGN RAINFALL.......... .....,........ ........ ."''''.. ...,..,............ .....",..,...........,..,....... ,.. ,....."..,.,.........10
<br />D. STORMW A TER MANAGEMENT MODELING .......................................,........................,........14
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<br />E. CUHP MODELING .,..........................."...,.."'...,.....,....,.....,..,."'......,."'..,..."'.."',.,....",......"........, 14
<br />Delineation of Subwatersheds . ,............. ..,.. ,...........".. ,...,..................,..,.,..",."., ....,....... "',..,....,. ,..,.. ...14
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<br />~;~~~~:.~:::;;~ti;l;:::::::':.:":'::.:::::':':,,:.::':,,:,::,:,::.:.:::::::::::':::::,::':::::,:"':::::'::,,,:':::",':,,:,,'::::::,:.:,,:: i ~
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<br />Retention Storagc Losses.. .....,. ,..... "',.......,....,.......,......"".......,."". .........,.,.. ......................." ,..",..".., .17
<br />Infiltration Losses..""., ,..,..., ,.....,.........,.... ,...,....",.."".",......,..,'............."......... .....,.......................",., I 7
<br />F, UDSWM 95 MODELING.."'...."'......"'.."'........"'..,................,..,.............................,...............,....,17
<br />Conveyance Element Identification Number........,......"'..................."......,."...,.......,..,.....,..,....,"'.."',17
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<br />Stream Geometry..,."...."".."..,..".."..,.."...,.."",..,.,.,.. "',... ,......"'...,.........................,......." "'..,.. ,........17
<br />Roughness.,.......",......,..,....... ,............,. ,....,.,..,.........,....,..,.".,......",...,."....,.."..,....,. ,...."...""...... ,...... ,17
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<br />G, RO~~~~~,;c,~,ti~,it~:: ::: ::::::::::: ::::: ::::::::: ::: ::::: ::: ::::::::: :::::::::::::: ::: :::: ::: ::::: :::: :::::: ::::: ::: ::::: :::: ::: ::: ::::::: :::: : ;
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<br />IV. HYDRAULIC ANAL ySIS....................................................................................................................31
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<br />A, GENERAL..................,., ""........"....."...,.."...,........"',"'..",....."'",.,."'....,...,....."',........., ..,...,.....,...31
<br />B HYDRAULIC PARAMETERS ,..,.""."..',......."..,...,..............,..,..',....,...,.....,....,.."'....,.........."'.....31
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<br />C, FLOW SPLITS"....,..,.....,.",..." ,.... ,......,....,..,..,..,.,.....'...,.. "'....... ""..,'..'...... ...............",."..", ,...... ..31
<br />D, IMPOUNDMENT AT CROSSINGS ....,..............................."'...............................................,"'....31
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<br />E. RESULTS,.",.",..",..,............... ,............,.."..,.....,....,....,.,.....,..............,.,............., .....,. ,...... ,..".., ,...,.31
<br />V. ALTERNATIVES DEVELOPMENT AND SELECTlON................................................................32
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<br />A. GENERAL",.",."".".""""""".".,..",.,..,..",""""".".""...,.",..".,."."."""",..,...",.""""."""".,.."",.32
<br />R PROBLEM AREA IDENTIFICA TION..,.,."'.....,.......,.,.....,........"..........,.....,.............,...,....,,,,___...32
<br />C ALTERNATIVES DEVELOPMENT .......,....."..,"'..,...........,....,..........,...."',.........."....,"'..,..........32
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<br />Conveyance Improvements........,....,.... ......."...,..,...,. .......,..........,......,......,...... ....." ,...,..,..........,..."... .32
<br />Crossing Improvements....,..."..... ,......,...."""......"..,................ "'...,... "'.. ,........, .......................,.,..."...33
<br />Regional Detention Basins ..' "'....... ,...... ..,.....,.... ,..................." ,....."..,.",. ,...... ,.. ....... ,.... ,....... ,..,. ........33
<br />D, ALTERNATIVES EVALUATION ..,"'..........."'...."'.."'.."''''....''',..,.............................................33
<br />E, RECOMMENDED ALTERNATIVE ,....,.....,..,........,"'..........,.."'.,"',................"'...,...,..,..,...........33
<br />F. SELECTION OF MAJOR DRAINAGEW A Y IMPROVEMENTS BY PROJECT SPONSORS .33
<br />PRELIMINARY DESIGN OF SELECTED IMPROVEMENTS ............................................................34
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<br />A, GENERAL",..,...,."",.,..,."""",.""."""..",.,,.,.,.,..".,.,.....'..',...',....,..,.".,."...,.,.,,.,."..,....,..."....",...,.34
<br />R DESIGN CRITERIA .......'...,..,..,...,..,......,........,.......,....,..."",...."...."'.,........,............,..........,.........34
<br />C. PROJECT PROPOSED IMPROVEMENTS ,"',..........,....,.............,.."....."'....,.......,........,........,"'.34
<br />South Platte River to Brighton Road "''''..'''...'''..,........,.............'''..,.........................,...........,...,.....___.34
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<br />~~~~~~ ~~~~: ~~~~ ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::~:
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<br />O'Brian Canal to 96th Avenue ,......,.......,..,..,......"....,..",..."..,...".,....,."..",..,.....,..",.."".""..,.............34
<br />Direct Flow Tributary, ....,.,....... ,....,.. ...,"'.,..,.,.....,..... ,...... ... ......". .....,. ...."".......,..",..,..,.".,.. ,...., .... ....34
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<br />Rolla Tributary, ",." "." ,.. '" "., ""... ,,' "".., "".".. "". .'" "" ,,'" ,.." ,,' ".,." """., "'" ". ...... ".." "",. ,. """ ",." ,'. .35
<br />Arsenal North Tributary ... ....,.,..............,..",.,.. .......' ,........ ,.........,..,'..........' ...... ........... ...... ...."'...... .... .35
<br />Birch Tributary ,..""""",..,.""""."'.."'.".',.",."",.,.",."...,....,.",.....,."..".."""..,.."""",.,.,.,.,.""",,,,,. ",35
<br />EInl Tributary""""""""""""",.,.""......"",.."".""""",."""""""""",.".""",..."""".."""".,.., ,.,."".,.,,35
<br />Uru'on Pac,' fic Tn'butary ".,'..'" "." """" ,.",.. """,'. ,'. .', """ .",." .". .'.. ..'. .35
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<br />Wolpert Tributary", "."."" ."., ""...., ".,'. "'" "" ,,' ,.,. '" ". ,. ,.,.,.., ,."", ,..., ,., ,.", ".", ."., ", ,.. "." ,,' ". ",." "', ..".35
<br />Maul Reservoir Preliminary Design Further Described ..................."'..."',"''''.........................'''.......35
<br />D. IMPROVEMENT COST ESTIMATES ..,...",........................"......,..,................,..,...,.......,........,....3 7
<br />E. IMPROVEMENT PRIORITIZATION ..........,....,....,............."..,...,.....,.,......"'.........,..",..,......,..,...37
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<br />References ,. ,. .'"",,'. ." ." "'" ."" ""'" "...".",..""" '." ..' '" "'" .,..", "'," ,." ",' ,," ,',"" ",'" .""" "',' ".". ," ,,'" ...,.'" .40
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<br />Appendl'ccs "". ,...,....... .............".."....','......'.. '...."".., ....., ,..".......,41
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