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<br />TABLE OF. CONTENTS <br /> <br />Paqe <br /> <br />EXECUTIVE SU~,RY-.-..----.------.-.-....-.---....----.--.-------- i <br />LIST OF TABLES-.---.-.-----.-------...-------....-..--.----------- ix <br />LIST OF FIGURES------....-.--..-.-..-----------.-.---------------- x <br /> <br />TABLE OF CONTENTS (continued) <br /> <br />Pa~e <br />aenefit;Cost Analysis-----------___...._._________._____.. 74 <br />Discussion...------______....._________________._______._. 74 <br /> <br />VIII. MASTER DRAINAGE PLAN-.--.--------___._____.______.___.____ 75 <br /> <br />I. INTRODUCTION---------------------------------_________-____ 1 <br /> <br />Purpose and Scope------------------------------------------ 1 <br />Authorization---------------------____________________.____ 2 <br />Acknowledgements----------.----------------------_____--___ 3 <br />Report Acquisition-----------------------------____________ 3 <br />Related Studies..-.-.--..---------------------------------- 4 <br />Mapping and Survey1ng------..-.---..-------.-.--.---------- 4 <br /> <br />II. FLOOD HISTORY-.---------------------------------___________ 5 <br />Ill. BASIN CHARACTERISTICS AND HYDROLOGY------------------------ 12 <br /> <br />Pawnee Creek----------.---------.-.-.--.------------------- 12 <br />Sand Creek Watersheds--.-----.-.-------..------------------ 12 <br />50j15.--------------________________.______.._....___..____ 14 <br />Precipitation-----------------------____________________.._ 14 <br />Design Hydrographs and Peak Flows--------------------______ 14 <br />Regional Design Curves------------------------------------- 16 <br />Develop~d Areas-.-.-.-------.--..----..-..-.--------------- 16 <br />Djscharge Profiles--------.--..---.---...-.--.------------- 21 <br />Irrioation Ditches--------------.-.------------------.-..-. 24 <br /> <br />lX. <br /> <br />IV. HYORAULIC A~ALYSIS-.--.---.--------------.----------------- 25 <br /> <br />Results----------______.___._._.._...__._._...________----- 25 <br /> <br />V. FLOOD PLAIN INFORMATION------------------------------.--..- 36 <br /> <br />Xl. <br /> <br />5-,10-,25-,and 50-year Events--.-----.---..---------------- 36 <br />lOO-year Event-----..-.--.--.-.-.---.----.--..------------- 36 <br />Extent of Floodinq----....--.--..---...-.------------------ 37 <br />Flood Insurance-------.__________._..__.____._..___________ 37a <br /> <br />VI. FLOOD DAMAGES--..----------------------------________._._._ 57 <br /> <br />VII. REGIONAL FLOOD MITIGATION--.-..--------..--.--------------- 69 <br /> <br />Dike Around Riversjde Cci:letery----..-----------------....-. 59 <br />Pioneer PJr~ Dam------------------------------------------- 73 <br />Estimated Costs-------------------------------------___4.__ 73 <br />Cost Estirr.ate for Dike Jt Ri~erside Cerr.etery--------------- 73 <br />Pioneer Par~ Dam Cost Estimate------------------------_4___ 73 <br />vii <br /> <br />Current Drainaqe Problems--..------------___..____________ 75 <br />South Platte River Drainage Area-----.----------_____._ 95 <br />Pioneer Ditch Drainage Area---.---..-------___.________ 95 <br />Existing Drainage Faciljties------------_________________. 96 <br />Storm Sewer Design Criteria------________.________________ 97 <br />Design Stonn---____.__.__________________.___________.. 97 <br />Flow Formula------_._..______________________________._ 98 <br />RunOff Coefficients--__._._..._____________..__________ 98 <br />Service Areas----.-----------____.__.___________..________ 98 <br />Service Area No. ].-..----------.--.--.-----___..______ 99 <br />Service Area No. 2....--------________.._______._..____ 101 <br />Service Area No. 3---..------------._._._______.____._.. 101 <br />Service Area No. 4--..-------------__________________.. 101 <br />Service Area No. 5----------..-.-------____..__________ 102 <br />Service Area No. 6_____.______________n_.____________. 102 <br />Service Area No. 7________________0._________......0.__ 102 <br />Service Area No. 3-___._.._._.____________...__________ 103 <br />Service Areas NO. 9,10, and 11________4__._._________.. 104 <br />Pioneer Ditch Improvements-----.-~..-------__.__.______ 104 <br />Ditch Re1ocation-------____4._.__.___________..________ 105 <br />Improvement Costs..----------____~._..~_________4...._____ 108 <br /> <br />x. <br /> <br />OPTIONS fOR REGIONAL FLOOD CONTROL AND DRAINAGF. <br />I~PROVEMENT.-.-----______.___________.4_.__________.._ 115 <br />POTENTIAL FUNDING OF FLOOD CONTROL AND DRAINAGE <br />PROJECTS..------_____...____________..._____.____o.___ 119 <br />REFERENCES-----_______.____________.__..._________________ 121 <br /> <br />, <br /> <br />viii <br /> <br />I <br />, <br />