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\\WE Wright Water Engineers, Inc, DENVER OFFICE 2490 West 26th Ave., Suite SSA Denver, Colorado 80211 (303) 480-1700 CHEYENNE OFFICE 3130 Henderson Drive Cheyenne, Wyoming 82001 (307) 638.9261 GLENWOOD SPRINGS OFFICE 818 Colorado Avenue P.O. Box 219 Glenwood, Springs, Colorado 81602 (303) 94S.7755 Denver Direct line: 893-1608 August 1, 1984 Urban Drainage and Flood Control District & Sponsoring Local Governments 2480 West 26th Avenue, Suite 156-B Denver, CO 80211 Ladies and Gentlemen: The Phase A of the Major Drainageway Planning, South Platte River, Agreement No. 83-04.01 is attached. Th i s master pl anni ng report covers a forty mi 1 e reach of the river from Chatfield Reservoir to the City of Brighton. This project was undertaken and completed with the excellent assistance and cooperation of the thirteen Project Sponsors listed on the cover. The pro- ject advisors assistance was invaluable. The leadership of Mr, Ben Urbonas of the District was instrumental in our meeting the objectives of the \\Ork within the time schedule. Wright Water Engineers is particularly grateful for the guidance and advice of the many developers, gravel company interests and innumerable local government staff people who gave unselfishly of their time in assisting us. The purpose of the Phase A report is to develop alternatives for the solu- tion of flood problems while maintaining a balance with respect to the uses of the river, The foremost and primary use of the South Platte River is for drainage and flood control. However, this use must be coordinated with water supply, sewerage, land use, building development, recreation, transportation, wild- life, and open space. The stated purpose has been achieved by the jOint effort of all sponsoring agenci es and advi sors, together wi th the staff of our speci al i zed ,cons~l- tants; Urban Environments, Ltd" Denton Harper Marshall, and the engIneerIng staff of our firm. Kenneth R. Wright William l. Lorah Richard O. Johnson Frank J. Trelease leo M. Eisel "'lnntn~ .~ ROBtR ......-<'0 ........- Ii'.. ~.......~ ..~G\STE"~. ~ s~.''l' (l"y~# t'''''l .. ~ {*\~ 3084 G)*~ ~, ..~ ~"l ..... ."-~ ~. ~;f'/....!'ONAL E.~.."~ .,,, -"'1'.(' ..........u, ~1'\)~ '. "f n-' "'" .. .... U, ",U'l.. \"l_,,~ 4'.....UI~ Urban Drainage and Flood August 1, 1984 Page 2 The report scope covers more than hydrologic and hydraul ic master pl anning for flood control. It includes reference source technical and planning information on the South Platte River including subjects such as: o River flow o Water rights o Water quality o Mineral resources o Geomorpho logy o Sedimentation o Groundwater o Parks and recreation inventory o Open space inventory o Trail and access road needs o Proposed parks and recreation o Boating inventory and needs River corridor is important. In fact, it We have i nc 1 uded a sect i on in the report The management of the South Platte is key to upgradi ng the corridor. on River Management. The master planning included the detailed study of eight distinct river reaches, For each reach numerous alternati ves were cons idered and sel ect alternatives were studied in detail. The study of alternatives included engineering evaluation, construction costing, determination of flood damages and damage reduction, and economic analysis. The resulting recommendations of the consulting engineers are presented in Sect i on XVI of the attached Ph ase A report. The recommended pl an is a result of the accumulated and integrated desires and needs of the various local governmental sponsors coupled with regional engineering and recreational constraints and opportunities. The recommended plan is practical, it is achievable, and it will result in a unified approach to control of the flooding problem within the fri'lllework of a valuable regional linear i'Illenity. The South Platte River corridor is an asset for all local governments and their citizens \\I1ich can be made to serve them better. Submitted by, ~;'~~E Principal in Charge By f'cu1~a~ Project Engineer By Ie!.. ...~~ Kenneth R. Wrigh P.E. Proj ect Man ager ~~d~ Mark W. Gl i d en, P. E. Proj ect Eng i neer By By By ~&~ Robert Slni th Denton Harper Marshall