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<br />& City 0/ Littleton
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<br />
<br />Table of Contents
<br />
<br />Executive Summary
<br />
<br />1.0 Introduction.......................................... ............ ...................................................................... 1-1
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<br />1.1 Authorization .............,............................................................................................................. 1-1
<br />
<br />1.2 Purpose and Scope....,............................................................................................................1-1
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<br />1.3 Planning Process ....................................................................................................................1-1
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<br />1.4 Mapping and Surveys..............................................................................................................1-2
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<br />1.5 Data Collection .................................................,......................................................................1-2
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<br />1.6 State and Local Regulations....................................................................................................1-2
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<br />1.7 Acknowledgments ................................................................................................................... 1-2
<br />
<br />2.0 Study Area Description..................................................................................,.......................2-1
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<br />2.1 Project Area ....... ............. ............ ............... ..................... ............. ...................... .......,....... ......2-1
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<br />2.2 Massey Draw., ................ ........,........ ..... ...... ....... .......... ... ............. .... ....... ....... .............. ..... ...... 2-1
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<br />2.3 SJCD (South) .......,.......... ... ....... ................. ........ .......... ... ..... .... ... ..... ............ ... ........ ........... ..... 2-1
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<br />2.4 Land Use and Characteristics ................................................................,................................2-1
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<br />2.5 Reach Description.. ... ... .......... ........ ........,. ..... ........ ............ ........ ..., ..... ... ..... ... ......,. ..., ,.., .....,.. ..2-1
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<br />2.6 Flood History............. ............. ......... .............. .......... ..... ..................... .......,. ......,.."................ ..2-1
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<br />2.7 Wetland and Riparian Zones, Flora, Fauna and Threatened or Endangered Species .............2-2
<br />3.0 Hydrologic Analysis ............................................................................................................... 3-1
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<br />3.1 Overview......... ......... ....... .................... ............. .................... ..... ............... ................ ..... .......... 3-1
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<br />3.2 Subwatershed Delineation......... ..... ............... ............... ................,....... ...... ............................. 3-1
<br />3.3 Watershed Imperviousness........................ ........ ............. ......"....... ...........',.......... .......... ........ 3-1
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<br />3.4 Depression Losses....... .................................,................. ....................... ........ ............,............ 3-1
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<br />3.5 Infiltration ..,............,....,...................................,..,...,........,......,..............,....".,...,..."..,.,........... 3-1
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<br />3.6 Rainfall......,.....,................,...,..........".......................................................................... ............3-1
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<br />3.7 UDSWM Routing Element Parameters...........................................................,.......,....,...........3-2
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<br />3.8 Model Calibration ... ... ..........,.. ...... ...., .............. .................. ... ..... ...... ... ...,. ........ ... ..... .... ..... ....... 3-2
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<br />3.9 Results ....,., .., ..., ........ ... .......,.. ........ ...., ..... ............. ....... ...... ....... ......... ....... ... ...... ..... .... ...... ......3-2
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<br />4.0 Hydraulic Analysis................................................................................................................. 4-1
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<br />4.1 Evaluation of Existing Facilities ...............................................................................................4-1
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<br />4.2 Flood Hazards.......... ....... ....... ..... ....,............. ............... ......... ....................... ....... .............. ......4-1
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<br />4.3 Floodplain Analysis... ...........,. ..... ....,............. .................. ...... ...............,..,.. ...... ........ .......... ..... 4-4
<br />
<br />0\
<br />
<br />Massey Draw and SJCD (South) Major Drainageway Planning Update
<br />Conceptual Design Report
<br />February 2006
<br />
<br />5.0 Alternatives Development and Evaluation............................................................................. 5-1
<br />
<br />5.1 Alternate Process.. ......... ............................ ................... ....,.. ......... ....... ...... ..... .......... ........... ...5-1
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<br />5.2 Alternate Plans, .............. ,.. ........... ......... ............ ........ ................ ......... ..............,.... ......... .........5-1
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<br />5.3 Alternative Evaluation., ...,.. .... .., ,.., ... ... .... ...... ..... ... ... ............ .......... ....... ..... ... ... ....... ... ..............5-2
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<br />6.0 Conceptual Design of Master Plan ........................................................................................ 6-1
<br />6.1 Master Plan Overview ..........................................................,..................................................6-1
<br />6.2 Master Plan Description ..........................................................................................................6-1
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<br />6.3 General Recommendations ...... ... .......... ........... .... ........... .... ....... .... .... ..... ..... ...... ... ... ..... ... .......6-6
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<br />6.4 Prioritizing and Phasing Plan...................................................................................................6-7
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<br />6.5 Cost Estimate .............. ........................ .......... ........... ................,........ ........... ........... ........ ...... ..6-7
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<br />6.6 Water Quality Impacts .............................................................................................................6-7
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<br />6.7 Operations and Maintenance...... .., ... ... ........ ... ........ ... ...... .... ...,...,.... ............ .., ........ ..... ... ,., ..... .6-7
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<br />6.8 Master Plan Drawings .......................................................,.....................................................6-7
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<br />7.0 References...............,............................................................................................................ 7-1
<br />
<br />List of Appendices
<br />Appendix A - Hydrologic Analysis
<br />Appendix B - Hydraulic Analysis and Alternatives Evaluation
<br />Appendix C - Meeting Minutes and Correspondence
<br />Appendix D - Selected Plan
<br />Appendix E - Legal Opinion
<br />Appendix F - Wetland and Riparian Inventory
<br />Appendix G - Plan and Profile Drawings
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