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FLOOD06961
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Last modified
1/25/2010 7:10:28 PM
Creation date
10/5/2006 2:37:11 AM
Metadata
Fields
Template:
Floodplain Documents
County
Jefferson
Community
Littleton
Stream Name
Massey Draw and SJCD South
Basin
South Platte
Title
Conceptual Design Report for Massey Draw and SJCD (South) Mjor Drainageway Planning Update
Date
2/1/2006
Prepared For
Jefferson County
Prepared By
Olsson Associates
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />& Ci(). 0/ Littleton <br /> <br /> <br />Massey Dri'l'N ana 5JCD (SouthJ M.cljOf Drit1nage"Nay Planning UpdiHe <br />Conceplu<ll /Jt'WJn Report <br />February 2006 <br /> <br />Executive Summary <br /> <br />Purpose and Objective <br /> <br />Table ES - 1 <br />A encies Invited to Partici ate in Master Plan Process <br />Centennial Water and Sanitation District Environmental Protection A enc Re ion VIII <br />Chatfield Watershed Authori Federal Emer en Mana ement A enc <br />Colorado De artment of Trans ortation Foothills Park and Recreation District <br />Colorado Division of Wildlife Ken Ca I Ranch Master Association <br />Colorado State Parks Meadow Ranch Master Association <br />Colorado Water Conservation Board PBS&J on behalf of CDOT <br />Deer Creek Golf Club South Suburban Parks and Recreation District <br />Denver Public Libra US Arm Cor s of En ineers <br />Denver Re ional Council of Governments <br /> <br />This report presents the results of a project entitled "Massey Draw and SJCD (South) Major <br />Drainageway Planning Update." The project was authorized by the Urban Drainage and Flood Control <br />District (UDFCD). Jefferson County and the City of Littleton are project co-sponsors. The project <br />study area, presented in Figure ES.1 , consists of the Massey Draw and SJCD (South) watersheds. <br />Except for the North Tributary of SJCD (South), both watersheds were originally studied in 1979. The <br />results of this study were presented in a report titled Major Drainageway Planning, Massey Draw & <br />North Tributary, SJCD (South) 6200 & Tributaries (Original Plan), The North Tributary of SJCO <br />(South) was studied in 1976 and the results were presented in the major drainageway planning study <br />for SJCD (North)-Basin 6100. <br /> <br />Table ES - 2 <br /> <br />I <br /> <br />Since the Original Plan was prepared, the Ken Caryl Ranch area east and west of the hogback (C. <br />470) have been developed, the Natural Resources Conservation Service (NRCS), formerly Soil <br />Conservation Service, produced more detailed soils maps that indicated substantially lower infiltration <br />rates west of the hogback, and new hydrologic modeling methodologies have been adopted. The <br />combination of these factors resulted in significantly increased flow rates at the hogback. In 1982, the <br />hydrology for Massey Draw was updated, which resulted in the 1 DO-year flows being increased from <br />23 percent to 211 percent at various points along Massey Draw. In addition, Jefferson County, <br />UDFCD, and private developers have constructed drainage improvements along the drainageways. <br />The purpose of the Massey Draw and SJCD (South) Major Drainageway Planning Update is to reflect <br />the revised hydrology and the drainage improvements that have been constructed, and to identify <br />future drainageway and flood control improvements that are needed. <br /> <br />Planning Process <br /> <br />Oraanizations and Reoresentatives That Participated in the Master Plannina Process <br />Oraanization Renresentative <br />Urban Drainage and Flood Control District Ben Urbonas, Project Director <br /> Bill OeGroot <br /> Kevin Stewart <br />Jefferson County Paula Lundquist <br />Alecia Cone <br />Citv of Littleton Bob Deeds <br />Ken Carvl Master Association Sean Warren <br />Foothills Park and Recreation District Bill Kieck <br />Centennial Water and Sanitation District Rick McCloud <br />Colorado Deeartment of Transoortation Justin Werdel <br />Colorado Water Conservation Board Larry Lana <br />Deer Creek Golf Club Jason Murphy <br /> Rick Schultz <br /> Tim Walker <br />Denver Renional Council of Governments Lar Munier <br />Meadow Ranch Master Association Inc. Board of Directors Chris Plant <br />Meadow Ranch Master Association I KC & Associates, LLC KathVChristensen <br />PBS&J (on behalf of Colorado Deoartment of Transportation) Harrv Strasser <br />Professionallnvestiaative Enaineers Paul Duncan <br />US Armv Cores of Enaineers Scott Franklin <br />JR Engineering Jim Fitzmorris <br /> Tim Schulte <br />Carruth Proeerties Greo Meeter <br />Hiah CountrY Enaineerino Adam Powell <br />Olsson Associates Bruce Buttner <br /> David Krickbaum <br /> Deb Ohlinger <br /> Dave Skuodas <br /> Amv Kurtz <br /> <br />The hydrologic models were prepared and calibrated to approximate flow rates from previous studies. <br />The model results were presented in the Hydrology Study dated April 2004. When the hydrology was <br />accepted, problem areas were identified using the model results and field observations. Alternatives <br />were developed for each reach to address the identified problems and presented to the project <br />sponsors at progress meetings. Based on input from the sponsors, the alternatives were refined and <br />presented in the Alternative Evaluation Report dated February 2005. <br /> <br />The project sponsors reviewed the recommendations in the Alternative Evaluation Report. Direction to <br />proceed with the conceptual design of the Selected Plan was received on April 11, 2005. The <br />Selected Plan is included in Appendix D. The meeting minutes are included in Appendix C. <br /> <br />Public meetings were held on October 19, 2004 and April 5, 2005 at Falcon Bluffs Middle School. <br />Fliers announcing the date and location were mailed to the residents in the watershed. 45 to 60 <br />people attended the meetings. The purpose of the first meeting was to present the alternatives and to <br />solicit input from the residents. The selected plan was presented at the second meeting. Comment <br />forms were made available. The forms that were returned are included in Appendix C, along with the <br />minutes and sign-in sheets from the meetings. <br /> <br />Tables ES - 1 and ES - 2 show the agencies that were invited to participate in the planning process, <br />and the individuals who were involved in the planning process, respectively. <br /> <br />0\ <br /> <br />ES.l <br />
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