ESSEX COUNTY, MASSACHUSETTS Essex County (ALL JURISDICTIONS) Volume 3 of 4 COMMUNITY NAME COMMUNITY NUMBER AMESBURY, CITY OF 250075 ANDOVER, TOWN OF 250076 BEVERLY, CITY OF 250077 BOXFORD, TOWN OF 250078 DANVERS, TOWN OF 250079 ESSEX. TOWN OF 250080 GEORGETOWN, TOWN OF 250081 GLOUCESTER, CITY OF 250082 GROVELAND, TOWN OF 250083 HAMILTON, TOWN OF 250084 HAVERHILL, CITY OF 250085 IPSWICH, TOWN OF 250086 LAWRENCE, CITY OF 250087 LYNN, CITY OF 250088 LYNNFILED, TOWN OF 250089 MANCHESTER BY THE SEA, TOWN OF 250090 MARBLEHEAD, TOWN OF 250091 MERRIMAC, TOWN OF 250092 METHUEN, CITY OF 250093 MIDDLETON, TOWN OF 250094 NAHANT, TOWN OF 250095 NEWBURY, TOWN OF 250096 NEWBURYPORT, CITY OF 250097 NORTH ANDOVER, TOWN OF 250098 PEABODY, CITY OF 250099 ROCKPORT, TOWN OF 250100 ROWLEY, TOWN OF 250101 SALEM, CITY OF 250102 SALISBURY, TOWN OF 250103 SAUGUS, TOWN OF 250104 SWAMPSCOTT, TOWN OF 250105 TOPSFIELD, TOWN OF 250106 WENHAM, TOWN OF 250107 WEST NEWBURY, TOWN OF 250108
Federal Emergency Management Agency
FLOOD INSURANCE STUDY NUMBER 25009CV003B
NOTICE TO FLOOD INSURANCE STUDY USERS
Communities participating in the National Flood Insurance Program have established repositories of flood hazard data for floodplain management and flood insurance purposes. This Flood Insurance Study (FIS) may not contain all data available within the repository. It is advisable to contact the community repository for any additional data.
Selected Flood Insurance Rate Map panels for the community contain information that was previously shown separately on the corresponding Flood Boundary and Floodway Map panels (e.g., floodways, cross sections). In addition, former flood hazard zone designations have been changed as follows:
Old Zone New NewZone Zone
A1 through A30 AE V1 through V30 VE B XX C XX
Part or all of this Flood Insurance Study may be revised and republished at any time. In addition, part of this Flood Insurance Study may be revised by the Letter of Map Revision process, which does not involve republication or redistribution of the Flood Insurance Study. It is, therefore, the responsibility of the user to consult with community officials and to check the community repository to obtain the most current Flood Insurance Study components.
Initial Countywide FIS Effective Date: July 3, 2012
Revised Coastal FIS Effective Date: TABLE OF CONTENTS
Table of Contents - Volume 1 - July 16, 2014
Page
1.0 INTRODUCTION 1
1.1 Purpose of Study 1
1.2 Authority and Acknowledgments 1
1.3 Coordination 9
2.0 AREA STUDIED 12
2.1 Scope of Study 12
2.2 Community Description 25
2.3 Principal Flood Problems 27
2.4 Flood Protection Measures 35
3.0 ENGINEERING METHODS 40 3.1 Hydrologic Analyses 41 3.2 Hydraulic Analyses 67 3.3 Coastal Analyses 73 3.4 Vertical Datum 105
4.0 FLOODPLAIN MANAGEMENT APPLICATIONS 106
4.1 Floodplain Boundaries 106
4.2 Floodways 109
FIGURES
Figure 1 – Transect Location Map 104 Figure 2 – Transect Schematic 105 Figure 3 – Floodway Schematic 113
i TABLE OF CONTENTS-continued
Table of Contents - Volume 1 - July 16, 2014
Page
TABLES
Table 1 – CCO Meetings Dates for Pre-Partial Countywide FIS 9
Table 2 – Flooding Sources Studied by Detailed Methods 12
Table 3 – Flooding Sources Studied by Detailed Approximate Methods 22
Table 4 – Letters of Map Change 25
Table 5 – Population and Total Area by Community 26
Table 6 – Summary of Discharges 50
Table 7 – Manning’s “n” Values 71
Table 8 – Precountywide Summary of Stillwater Elevations 76
Table 9 – Summary of Revised Stillwater Elevations 80
Table 10 – Countywide Transect Descriptions 85
Table 11 – Countywide Transect Data 95
ii TABLE OF CONTENTS – continued
Table of Contents - Volume 2 - July 16, 2014
Page
5.0 INSURANCE APPLICATIONS 178
6.0 FLOOD INSURANCE RATE MAP 179
7.0 OTHER STUDIES 183
8.0 LOCATION OF DATA 183
9.0 BIBLIOGRAPHY AND REFERENCES 183
TABLES
Table 12 – Floodway Data 115
Table 13 – Community History Map 180
TABLE OF CONTENTS – VOLUME 3 - July 16, 2014
EXHIBITS
Exhibit 1 - Flood Profiles
Argilla Brook Panel 01P-02P Artichoke River - Reservoir Panel 03P-05P Bare Meadow Brook Panel 06P-07P Bartlett Brook Panel 08P-09P Bates Brook Panel 10P Beaver Brook (Town of Danvers) Panel 11P-12P Beaver Brook (Town of West Newbury) Panel 13P-14P Beaverdam Brook Panel 15P-17P Bennett's Pond Brook Panel 18P-19P Boston Brook Panel 20P-22P Branch of Ipswich and Cleveland Brook Panel 23P-24P Bulford Brook Panel 25P Centerville Creek Panel 26P-27P Chubbs Brook Panel 28P Cochichewick Brook Panel 29P-30P
iii TABLE OF CONTENTS – continued
Table of Contents - Volume 3 - July 16, 2014
EXHIBITS - continued
Exhibit 1 - Flood Profiles – continued
Crane River and Crane Brook Panel 31P Crane Brook Panel 32P Creek Brook Panel 33P-34P Emerson Brook Panel 35P Fish Brook Panel 36P-41P Fish Brook (Town of Andover) Panel 42P-43P Fiske Brook Panel 44P Goldthwaite Brook Panel 45P-47P Harris Brook Panel 48P-49P Hawkes Brook Panel 50P-52P Howlett Brook Panel 53P-54P Howlett Brook and Pye Brook Panel 55P Hussey Brook Panel 56P-57P Hussey Brook Tributary Panel 58P Ipswich River Panel 59P-70P Jackman Brook Panel 71P-72P Johnson Creek Panel 73P-74P Little River Panel 75P-78P
TABLE OF CONTENTS – VOLUME 4 - July 16, 2014
EXHIBITS – continued
Merrimack River Panel 79P-92P Mile Brook Panel 93P Miles River Panel 94P-98P Mill River (City of Gloucester) Panel 99P Mill River (Town of Rowley) Panel 100P Millvale Reservoir Brook Panel101P-102P Mosquito Brook Panel103P-105P North Beverly Drainage Ditch Panel 106P North River and Proctor Brook Panel 107P Proctor Brook Panel 108P-110P North Tributary Brook Panel 111P-112P Parker River (Town of Boxford) Panel 113P-115P
iv TABLE OF CONTENTS - continued
Table of Contents - Volume 4 - July 16,
EXHIBITS – continued
Exhibit 1 - Flood Profiles – continued
Parker River (Town of Georgetown) Panel 116P-117P Parker River (Town of Newbury) Panel 118P-120P Peat Meadow Brook Panel 121P-123P Penn Brook Panel 124P-126P Porter River Panel 127P Porter River and Frost Fish Brook Panel 128P Powwow River Panel 129P-132P Riverside Airport Brook Panel 133P-134P Saugus River Panel 135P-141P School Brook Panel 142P Shawsheen River Panel 143P-147P Shute Brook Panel 148P-149P Skug River Panel 150P Spicket River Panel 151P-153P Strongwater Brook Panel 154P Tapley Brook Panel 155P Tributary A to Ipswich River Panel 156P-157P Tributary to Neal Pond Panel 158P Unnamed Tributary to Fish Brook Panel 159P
Exhibit 2 - Flood Insurance Rate Map Index Flood Insurance Rate Map
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F STREAM DISTANCE IN FEET ABOVE STATE ROUTE 133 69P 120 120
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F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH MERRIMACK RIVER 77P 60 60
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F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH MERRIMACK RIVER 78P