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<br />I <br /> <br />_Ine, KETCHUM. KONKEL. BA_RRETT . NICKEL. AUSTIN, Ine, <br /> <br />. Consulting Engineers <br /> <br />I <br /> <br />7456 West 5th Ave.. Deliver, Colo. 80226.. 303/232-6050 <br /> <br />'I <br /> <br />September 22, 1978 <br /> <br />II <br /> <br />'I <br /> <br />L. Scott Tucker, Executive Director <br />Urban Drainage and Flood Control District <br />2480 West 26th Avenue, Suite 156B <br />Denver, Colorado 80211 <br /> <br />'I <br /> <br />'I <br /> <br />Dear Mr. Tucker: <br /> <br />I <br /> <br />According to our Agreement No. 76-10.5, we have completed the Major Drain- <br />ageway Planning for Lee Gulch and Little Creek, Phase B. This report <br />presents the conceptual and preliminary design for the flood control im- <br />provement alternatives selected after evaluation of the Phase A report <br />prepared in October, 1977. <br /> <br />I <br /> <br />We wish to express our appreciation to Mr. Ben Urbonas of the District <br />staff, Mr. Andy McMinimee and Mr. Charles Blosten of the City of Little- <br />ton, Mr. Bill McCall of Arapahoe County, and Mr. H. Wm. Woodcock of the <br />South Suburban Metropolitan Recreation and Park District for their as- <br />sistance and attention during preparation of the report. <br /> <br />I <br /> <br />'I <br /> <br />Yours truly, <br /> <br /> <br />~~.f::~~ <br /> <br />Principal-in-Charge <br /> <br />I <br /> <br />'I <br /> <br />~~tB,~Cr <br /> <br />Howard B. Browning, P.E. <br />Associate <br />Project Manager <br /> <br /> <br /> <br />"~I <br /> <br />I <br /> <br />pkl <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />MichMl H. Berrett <br />Donevon D. Nickel <br />David E. Austin <br />DonT. Pyle <br /> <br />OFFices <br />Glenwood Springs, Colo. <br />Rifle, Colo. <br />New York, N.Y. <br /> <br />Donald C. Weblft <br />l.eroy E. Toblltl' <br />John K. STight <br />CharI. D. KlfYes <br /> <br />William B. O'Neal <br />Neil F. Dunbar <br />Robert D. SeMrow <br />Milo S. KetChum, Special Conlultant <br /> <br />I <br /> <br />C. .l8mes Erickson <br />John W. M$e$ <br />H~ B. Browning <br />Martin S. Oldford <br /> <br />A. J, Ryan "goa-1967} <br />E. Vernon Konk.eI(1923-1970) <br /> <br />James A. Davil <br />David D. Glll~ie <br />JerryJ. York <br />Robert A, W.mstey <br /> <br />Or: t" <br />., ! 5' i <br />-. --- -..,.1 <br /> <br /> <br />Cnu' r- -,.. <br />. ~I.:,._-, <br />E2~: .3 _ i <br /> <br />,-. .: i ~-., i;--;;:\L <br /> <br />TABLE OF CONTENTS <br /> <br />13:0 <br />"..'.. <br />~'Li; , <br /> <br />; i'! ": -~r <br /> <br />SECTION <br /> ABSTRACT <br />I. INTRODUCTION <br />II. STUDY AREA <br />III. HYDROLOGY <br />IV. HYDRAULICS <br />V. SELECTED ALTER~ATIVES <br />VI. COST ESTIMATES <br />VII. CONSTRUCTION SEQUENCE <br /> <br />LIST OF FIGURES - I. <br />II. <br /> <br />AREA OF CONCERti <br />ALTERNATE SCREENING MATRIX <br /> <br />LIST OF TABLES - I. <br />II. <br />III. <br />IV. <br />V. <br />VI. <br />VII. <br /> <br />HYDROGP~H PARAMETERS <br />PEAK RUNOFF AND STORM VOLUMES <br />BENEFIT COST EVALUATION OF ALTERNATE PLANS <br />UNIT CONSTRUCTION COSTS <br />ESTIMATED COST, LEE GULCH <br />ESTIMATED COST, LITTLE CREEK <br />ESTIMATED COST BY JURISDICTION <br /> <br />APPENDIX <br /> <br />FLOOD HYDROGRAPHS, LEE GULCH <br />FLOOD HYDROGRAPHS, LITTLE CREEK <br />PEAK FLOW PROFILES, LEE GULCH <br />PEAK FLOW PROFILES, LITTLE CREEK <br />LEGAL OPINION <br />AGENCY/PERSONNEL CONTACTED <br />REFERENCES <br /> <br />DRAWINGS - SHEETS 1 Thru 20 <br /> <br />~~ <br />-\8i' <br /> <br /> <br />G~;~:i;I~T. <br /> <br />~TFEF.T <br /> <br />PAGE <br /> <br />2 <br /> <br />3 <br /> <br />3 <br /> <br />5 <br /> <br />7 <br /> <br />7 <br /> <br />11 <br /> <br />17 <br /> <br />A-I <br />A-3 <br />A-6 <br />A-7 <br />A-8 <br />A-11 <br />A-11 <br /> <br />.' <br /> <br />:",r-, <br /> <br />-1- <br />