FLOOD11759

• County: Mesa
• Stream Name: Bosley Wash
• Basin: Colorado Mainstem
• Title: Bosley Wash Drainage Master Plan - Phase 2: Alternative Drainage Facility Evaluation - Draft
• Date: 11/1/2002
• Prepared For: Bosley Wash Watershed, CWCB
• Prepared By: HDR Engineering, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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P~(lse 2: Alternative Drainage Facility Evaluation

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TABLE OF CONTENTS

1.0 INTRO n U CTI 0 N ... ............... ................................................................................. .... ................ 1

1.1 GENERAL SCOPE ......................... ............................................ ........................... .......... 1

1.2 PHASE 1 EFFORT....... .........................,..................................................... .................... 1

1.3 PHASE 2 SCOPE............................................................................................................ 2

1.4 PHASE 3 SUMMARY ....................................................... .......................... ......... ............2

2.0 PROBLEM In ENTIFI CA TI ON ...... ....... ..... ..... ........ .... .~........ ............ ..... ................ .... ....... ......... 2

2.1 INADEQUATE CHANNEL CAPACITy....................................... ....................................... 2
2.1.1 Hwy 6/UNION PACIFIC RAILROAD CHANNEL.................................................... 3

2.1.2 STUB DITCH............................. .......... ........................................ ....... .................. 3

2.1.3 F % .L{OAD .... ~............... ...... ...~...:.. ......................... ~....... _....,......................... .'.... 4

2.2 UNDERSIZED CULVERTS.... .......................................................................................... 4

2.2.1 G ROAD.............................................................................................................. 4

2.2.2 GOVERNMENT HIGHLINE CANAL ........................................................................5

2.2.3 Hwy 6/UPRR ............................ ......................................................................... 5

2.3 INADvERTENT STORAGE.............................................................................................. 6
2.3.1 UPSTREAM OF 1-70................. .................................... .......... .......... ..................... 6

2.3.2 G ROAD.......................................................................................................... .... 6

2.3.3 GOVERNMENT HIGHLINE CANAL ....................................................................... 7

2.3.4 Hwy 6/UPRR ..................................................................................................... 7

2.4 PUBLIC MEETING INpUT ............. ...................................................... .................... ........7

3.0 AL TERNA TIVE DEVELOPMENT ............................................................................................ 9

3.1 STORAGE...................................................................................................................... 9

3.1.1 STORAGE ABOVE STUB DITCH AT RESERVOIR M&N ....................................... 10
3.1.2 STORAGE ABOVE 1-70 AT RESERVOIR A........................................................... 10
3.2 IMPROVED CHANNEL CAPACITy................................................................................ 11
3.2.1 IMPROVE CHANNEL ALONG STUB DITCH.......................................................... 12
3.2.2 IMPRoVE CHANNEL ALONG F % ROAD ............................................................. 12

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