FLOOD10477

• Designation Number: 594
• County: Jefferson
• Community: Jefferson County and Incorporated Areas
• Title: FIS - Jefferson County and Incorporated Areas - Vol 4
• Date: 6/17/2003
• Prepared For: Jefferson County
• Prepared By: FEMA
• Floodplain - Doc Type: Current FEMA Regulatory Floodplain Information

T ABLE OF CONTENTS

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1.0 INTRODUCTION ................ .... ............. ... ........ ....... ....... ........ ...................... ... ............. ..... ... .... ..... 1

1.1 Purpose of Study................................................................................... " . . . . .. . . . . . . . . . . .. . . . . . . . . . .. · · · .. 1

1.2 Auth.ority and Ackn.owled.gments... .... ......... ... .... .......... ........ ............ ... .... ......... ....... ... ...... .... 1

1.3 Coordmation . ~ ........... ........... .... .... .......... ......... ... ....... ............... .... ....... .'. .... ... ........ .......... .... 3

2.0 AREA STUDIED ................................................................................................................................................ 5

2.1 Scope of Study............................................................................................................................. 5

2.2 Community Description............................................................................................................................ 9

" 2.3 Principal Flood. Problems............................................................................................................ 13

2.4 Fl ood. Protection Mea.sures.......................................................................................................................... 21

3.0 ENGINEERIN'G METHODS. .... ................ ....... .... ..... ....... ...... ...... ... .... ...... .... .... ........................ 24

3.1 Hydrologic Analyse.s ....... ....... .... ..... ...... .......... .... ...... ............... .......... ..... ... ........... .... ..... .... 24

3 . 2 Hydraulic Analyses ............................. ~ . . . . . . . .. . .0 . 0 o. . . . . . . . . . . . . . 0 .. . . . . . . . . . . 0 . . 0 . . . . . . .. . . 0 . . . . . . . .. . . .. . . . . . . . . ~ . . .. .. 30

4.0 FLOODPLAIN MANAGEMENT APPLICATIONS............................................................... 49

4.1 Flood.plain Boundaries............................................................................................................... o. .. .. .. 49

4. 2 Flood. ways. . . . . . . . . . . 0 . . .. . . .. . . . . . . . . ... . . . . . . .. . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . .. 50

5.0 INSURA.NCE APPLICA nON. ........ ........... ................... ... ...... ............... ........ ..... ..... ....... .... .... ... 51

6.0 FLOOD INSURA.NCE RATE MAP ... ............... .... ........... .... ....... 00.... ........... .............. ... .... ..... ....... 75

7.0 OTHER STUDIES. 0.' . . .... ... . . .. .... .. .. . .. .. . ... ... . . . .. . . ."" . . . . .. . .. . .. .. .. . .. .. ... . . . . .. . .... .. . . . . . . . .' .. . .. .. . . . ... ... .. . .. . .. . . . . ... . . . . . ... . . . ... 77

8.0 LOCA TI 0 N 0 F DATA............................................................................................................................. 78

9.0 BffiLIOGRAPHY AND REFERENCES ....... ............ ....... .................. .... .......... .... ...... ... ..... .......... ..... 78