PDF (53.8 MB) - Urban Drainage and Flood Control District

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Muller Engineering Company, Inc. Happy Canyon Creek Major Drainageway Plan - DRAFT 1.4 Mapping and Surveys Mapping data sources used for the Happy Canyon Creek MDP included the following: • Color aerial photography was provided by UDFCD. The photography was generated as part of the Denver Region Aerial Photography Project (DRAPP) by the Denver Region Council of Governments (DRCOG). Photographs are from spring 2010, meet 1”=200’ horizontal mapping standards, and have a resolution of 1 foot. • 2-foot interval topography within the northern project area (north of Lincoln Avenue) was obtained from the Denver Democratic National Convention (DNC) LIDAR Survey compiled by Sanborn Geospatial on July 25, 2008. • 2-foot interval topography along the main stem of Happy Canyon Creek south of Lincoln Avenue and along Badger Gulch was provided by UDFCD. The topography was prepared by Landmark Mapping, Ltd. at a scale of 1”=100” and was based on aerial photography dated December 17, 2011 (Happy Canyon) and October 2012 (Badger Gulch). • 5-foot interval topography in Douglas County was provided by the County and was used to delineate watershed boundaries and define subwatershed and channel properties south of Lincoln Avenue. The source of the mapping was Merrick & Company’s 1996 Digital Elevation Model (DEM) “Mass Points.” 1.5 Data Collection Numerous reports, studies, and design plans were reviewed and utilized in the preparation of this report. A listing of the primary references is as follows; a full listing is included in the References section at the end of this report. • 1977 Flood Hazard Area Delineation, Happy Canyon Creek, Badger Gulch, Newlin Gulch, Baldwin Gulch, Sulphur Gulch, Tallman Gulch (Howard, Needles, Tammen & Bergendoff) • 1993 Happy Canyon Creek Watershed Outfall Systems Planning Study (Kiowa Engineering Corporation) • 2001 Phase I Design Report, Happy Canyon Creek Channel Restoration [in Grandview Estates] (HDR, Inc.) 1.6 Acknowledgements This report could not have been prepared without the participation and support of the following project sponsors and stakeholders. We are grateful for their contributions. • Ground survey of stream crossings on main stem Happy Canyon Creek and was provided by UDFCD. Survey was conducted by Accurate EngiSurv, LLC in December 2011 (Happy Canyon). Additional ground survey of structures and other various sensitive areas was conducted in November 2012. All mapping is on the Colorado State Plane Central Zone projection, horizontal datum NAD83, and vertical datum NAVD 1988. Existing parcel boundaries, zoning, jurisdictional boundaries, and Digital Flood Insurance Rate Map (DFIRM) data were provided by Douglas County and SEMSWA in Geographic Information System (GIS) format. SEMSWA data also included existing storm infrastructure within their jurisdiction. August 2013 Page 1-3 Alternative Analysis
Muller Engineering Company, Inc. Happy Canyon Creek Major Drainageway Plan - DRAFT Table 1-2 Project Participants Project Sponsors Shea Thomas Brad Robenstein Greg Weeks Ward Mahanke Tom Williams Jacob James Monica Bortolini Project Stakeholders Stacey Thompson Bryan Ruth Ken Linhardt Denise Denslow Brad Meyering Charlie Fagan Bill Ruzzo Agency Urban Drainage and Flood Control District Douglas County City of Lone Tree representing City of Lone Tree Town of Parker Town of Parker Southeast Metro Stormwater Authority Agency Arapahoe County representing Rampart Range Metro District representing Rampart Range Metro District representing Rampart Range Metro District City of Castle Pines Castle Pines North Metro District Cherry Creek Basin Water Quality Authority August 2013 Page 1-4 Alternative Analysis
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TO: Study Sponsors and Stakeholders
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DRAFT ALTERNATIVE ANALYSIS COMMENTS
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Arapahoe County Comments Section 5.
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FINAL ALTERNATIVE ANALYSIS COMMENTS
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NAME: P:\12-010.01 Happy Canyon Cre
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6270 Happy Canyon FHAD Plan: Happy
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5850 Happy Canyon FHAD Plan: Happy
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Damage Estimate ‐ FHAD Q's w/ ALT
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