VOLUME 4 OF 4 YORK COUNTY, MAINE (ALL JURISDICTIONS)
COMMUNITY NAME NUMBER COMMUNITY NAME NUMBER ACTON, TOWN OF 230190 OGUNQUIT, TOWN OF 230632 ALFRED, TOWN OF 230191 OLD ORCHARD BEACH, TOWN OF 230153 ARUNDEL, TOWN Of 230192 PARSONSFIELD, TOWN OF 230154 BERWICK, TOWN OF 230144 SACO, CITY OF 230155 BIDDEFORD, CITY OF 230145 SANFORD, CITY OF 230156 BUXTON, TOWN OF 230146 SHAPLEIGH, TOWN OF 230198 CORNISH, TOWN OF 230147 SOUTH BERWICK, TOWN OF 230157 DAYTON, TOWN OF 230148 WATERBORO, TOWN OF 230199 ELIOT, TOWN OF 230149 WELLS, TOWN OF 230158 HOLLIS, TOWN OF 230150 YORK, TOWN OF 230159 KENNEBUNK, TOWN OF 230151 KENNEBUNKPORT, TOWN OF 230170 KITTERY, TOWN OF 230171 LEBANON, TOWN OF 230193 LIMERICK, TOWN OF 230194 LIMINGTON, TOWN OF 230152 LYMAN, TOWN OF 230195 NEWFIELD, TOWN OF 230196 NORTH BERWICK, TOWN OF 230197 EFFECTIVE:
FLOOD INSURANCE STUDY NUMBER 23005CV004A Version Number 2.3.2.1
TABLE OF CONTENTS Volume 1 Page
SECTION 1.0 – INTRODUCTION 1 1.1 The National Flood Insurance Program 1 1.2 Purpose of this Flood Insurance Study Report 2 1.3 Jurisdictions Included in the Flood Insurance Study Project 2 1.4 Considerations for using this Flood Insurance Study Report 20
SECTION 2.0 – FLOODPLAIN MANAGEMENT APPLICATIONS 31 2.1 Floodplain Boundaries 31 2.2 Floodways 43 2.3 Base Flood Elevations 44 2.4 Non-Encroachment Zones 44 2.5 Coastal Flood Hazard Areas 45 2.5.1 Water Elevations and the Effects of Waves 45 2.5.2 Floodplain Boundaries and BFEs for Coastal Areas 46 2.5.3 Coastal High Hazard Areas 47 2.5.4 Limit of Moderate Wave Action 48
SECTION 3.0 – INSURANCE APPLICATIONS 49 3.1 National Flood Insurance Program Insurance Zones 49 3.2 Coastal Barrier Resources System 51
SECTION 4.0 – AREA STUDIED 51 4.1 Basin Description 51 4.2 Principal Flood Problems 52 4.3 Non-Levee Flood Protection Measures 54 4.4 Levees 57
SECTION 5.0 – ENGINEERING METHODS 58 5.1 Hydrologic Analyses 58 5.2 Hydraulic Analyses 78 5.3 Coastal Analyses 106 5.3.1 Total Stillwater Elevations 110 5.3.2 Waves 111 5.3.3 Coastal Erosion 111 5.3.4 Wave Hazard Analyses 112 5.4 Alluvial Fan Analyses 123
i
TABLE OF CONTENTS - continued Volume 1 - continued
Figures Page
Figure 1: FIRM Index 23 Figure 2: FIRM Notes to Users 24 Figure 3: Map Legend for FIRM 27 Figure 4: Floodway Schematic 43 Figure 5: Wave Runup Transect Schematic 46 Figure 6: Coastal Transect Schematic 48 Figure 7: Frequency Discharge-Drainage Area Curves 76 Figure 8: 1% Annual Chance Total Stillwater Elevations for Coastal Areas 110 Figure 9: Transect Location Map 121
Tables Page
Table 1: Listing of NFIP Jurisdictions 2 Table 2: Flooding Sources Included in this FIS Report 33 Table 3: Flood Zone Designations by Community 50 Table 4: Coastal Barrier Resources System Information 51 Table 5: Basin Characteristics 52 Table 6: Principal Flood Problems 52 Table 7: Historic Flooding Elevations 54 Table 8: Non-Levee Flood Protection Measures 54 Table 9: Levees 57 Table 10: Summary of Discharges 64 Table 11: Summary of Non-Coastal Stillwater Elevations 77 Table 12: Stream Gage Information used to Determine Discharges 78 Table 13: Summary of Hydrologic and Hydraulic Analyses 89 Table 14: Roughness Coefficients 105 Table 15: Summary of Coastal Analyses 107 Table 16: Tide Gage Analysis Specifics 111 Table 17: Coastal Transect Parameters 113 Table 18: Summary of Alluvial Fan Analyses 123 Table 19: Results of Alluvial Fan Analyses 123
Volume 2
SECTION 6.0 – MAPPING METHODS 124 6.1 Vertical and Horizontal Control 124 6.2 Base Map 125 6.3 Floodplain and Floodway Delineation 126 6.4 Coastal Flood Hazard Mapping 190
ii
TABLE OF CONTENTS - continued Volume 2 - continued
6.5 FIRM Revisions 200 6.5.1 Letters of Map Amendment 200 6.5.2 Letters of Map Revision Based on Fill 200 6.5.3 Letters of Map Revision 201 6.5.4 Physical Map Revisions 202 6.5.5 Contracted Restudies 202 6.5.6 Community Map History 202
SECTION 7.0 – CONTRACTED STUDIES AND COMMUNITY COORDINATION 204 7.1 Contracted Studies 204 7.2 Community Meetings 213
SECTION 8.0 – ADDITIONAL INFORMATION 217
SECTION 9.0 – BIBLIOGRAPHY AND REFERENCES 219
Tables Page
Table 20: Countywide Vertical Datum Conversion 124 Table 21: Stream-Based Vertical Datum Conversion 125 Table 22: Base Map Sources 126 Table 23: Summary of Topographic Elevation Data used in Mapping 127 Table 24: Floodway Data 128 Table 25: Flood Hazard and Non-Encroachment Data for Selected Streams 190 187 Table 26: Summary of Coastal Transect Mapping Considerations 191 Table 27: Incorporated Letters of Map Change 201 Table 28: Community Map History 203 Table 29: Summary of Contracted Studies Included in this FIS Report 205 Table 30: Community Meetings 214 Table 31: Map Repositories 217 Table 32: Additional Information 219 Table 33: Bibliography and References 220
iii
TABLE OF CONTENTS - continued Volume 3 – continued
Exhibits
Flood Profiles Panel Batson River 01-02 P Blacksmith Brook 03 P Bridges Swamp 04 P Cape Neddick River 05-06 P Chickering Creek 07 P Cider Hill Creek 08-09 P Coffin Brook 10 P Coffin Brook Tributary 1 11-12 P Cooks Brook 13-16 P Day Brook 17 P Depot Brook 18 P Dolly Gordon Brook 19-20 P Driscoll Brook 21-22 P Ferguson Brook 23-24 P Fuller Brook 25 P Goodall Brook 26 P Goosefare Brook 27-29 P Great Works River 30-41 P Green Brook 42-43 P Hill Creek 44 P Josias River 45 P Keay Brook 46-47 P Kennebunk River 48-53 P Little Ossipee River 54-66 P Little River (Town of Berwick) 67-70 P Little River (Town of Cornish) 71 P Little River (Town of Kennebunk) 72 P Little River 73-74 P Littlefield River 75-78 P Merriland River (Lower Reach) 79 P Merriland River (Upper Reach) 80 P Middle Branch Mousam River 81 P Mill Brook 82 P Moors Brook 83 P
iv
TABLE OF CONTENTS - continued Volume 4
Exhibits
Flood Profiles Panel Mousam River (City of Sanford) 84-89 P Mousam River (Lower Reach) 90-91 P Mousam River (Town of Kennebunk) 92-95 P Mulloy Brook 96 P Ogunquit River 97-99 P Ogunquit River Tributary 100 P Ossipee River 101-106 P Saco River 107-124 P Saco River - Left Channel 125 P Salmon Falls River 126-141 P Sawyer Brook 142 P Smith Brook 143 P South Branch of West Brook 144 P Spinney Creek 145 P Spruce Creek 146 P Stevens Brook 147 P Thatcher Brook 148 P Tributary 1 to Cape Neddick River 149 P Tributary 1 to Green Brook 150 P Tributary to Middle Branch Mousam River 151 P Unnamed Tributary to Stony Brook 152 P Webhannet River 153 P West Brook 154 P Worster Brook 155-157 P Worster Brook Tributary 3 158-159 P
Published Separately
Flood Insurance Rate Map (FIRM)
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D D
D
D
180 180 S
A A
A
W
R
O
O O
O
D
O
R R
O
R
A
D
O
O
D D
D
A
W
L
R
R R
E
R
F
O O
L
O
M
F F
E
F
)
Y V
N N
N
8
R
A
A A
A
8
R
R
S S
CULVERT S
E
D
G
D D
D
B
V
L L
170 L 170
B
A
O O
O
N
N
(
A
T
R
E
C
E
F
N
I
N
O
I
T 160 160
A
V
E
L
E
Y
C
150 AC 150 N
E
G
A
AB AE
T
N
E Z AA AD E
)
M
M
S
E
,
N
140 140 G
O
Y
I
A
T LEGEND T
N
C
I
A 0.2% ANNUAL CHANCE FLOOD N
D
M U
S
U I
O
Y
1% ANNUAL CHANCE FLOOD R
C
U
C
J
N 2% ANNUAL CHANCE FLOOD
L
T E 130 K
L
G
R 10% ANNUAL CHANCE FLOOD A
(
R
O N S W Y E
STREAM BED Y
M
E
L M O P Q R V X CROSS SECTION LOCATION L
A
R
120 E
13000 14000 15000 16000 17000 18000 19000 20000 21000 22000 23000 24000 25000 26000 D
E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE SALMON FALLS RIVER 156P146P147P02P 260 260
Y
D
U
D
250 T 250
A
S
O
D
R
D
A
E
O
D
L
I
R
R
A
O
N
T
F
E
W
N
D
O
A
R
F
S
B
O
D
S
L
240 T 240
I
K
E
O
M
O
L
I
I
L
O
F
R
O
B
R
R
E
P
T
D 230 230 S
R
O
O
O
W
L
F
)
8
8
D
V 220 220
A
N
(
T
E
E
F
N
I
N
O
I
T 210 210
A
V
E CULVERT
L
E
CULVERT Y
C
200 200 N
E
G
A
T
N
E
E
)
M
M
S
E
,
N
190 190 G
O
Y
I
A
T LEGEND T
N
C
I
A 0.2% ANNUAL CHANCE FLOOD N
D
M U
S
I
O
Y
1% ANNUAL CHANCE FLOOD R
C
U
C
J
N 2% ANNUAL CHANCE FLOOD
L
E 180 K
L
G
R 10% ANNUAL CHANCE FLOOD A
(
R
O AG AK AN AT E
STREAM BED Y
M
E
AF AH AI AJ AL AM AO AP AQ AR AS CROSS SECTION LOCATION L
A
R
170 E
26000 27000 28000 29000 30000 31000 32000 33000 34000 35000 36000 37000 38000 39000 D
E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE SALMON FALLS RIVER 157P147P03P148P 270 270 1% BACKWATER EFFECT FROM WORSTER BROOK
260 H 260
K
T
I
O
O
W
R
E
B
C
3
R
N
E
E
Y
T
U
S
L
R
F
R
A
N
O
S
O
T
250 W 250
C
E
U
L
B
I
I
F R
T
O
K
R
O
P
O
R 240 240 D
B
O
R
O
E
L
T
F
S
)
R
8
O
8
D
W
V 230 230
A
N
(
T
E
E
F
N
I
N
O
I
T 220 220
A
V
E
L
E
Y
C
210 210 N
E
G
A
T
N
E
E
)
M
M
S
E
,
N
200 200 G
O
Y
I
A
T LEGEND T
N
C
I
A 0.2% ANNUAL CHANCE FLOOD N
D
M U
S
I
O
Y
1% ANNUAL CHANCE FLOOD R
C
U
C
J
N 2% ANNUAL CHANCE FLOOD
L
E 190 K
L
G
R 10% ANNUAL CHANCE FLOOD A
(
R
O
E
STREAM BED Y
M
E
A B C D E F CROSS SECTION LOCATION L
A
R
180 E
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 D
E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH WORSTER BROOK 158P148P149P01P 340 340
Y
D
D
U
A
330 T 330
O
S
R
D
L
E
L
I
L
I
H
A
3
N
T
E
O
Y
D
S
R
P
F
A
O
M
S
T
O
320 T 320
I
E
H
U
T
M
L
B
I
I
I
L
F R
T
O
K
R
O
CULVERT P
O
R 310 310 D
B
O
R
O
E
L
T
F
S
)
R
8
O
8
D
W
V 300 300
A
N
(
T
E
E
F
N
I
N
O
I
T 290 290
A
V
E
L
E
Y
C
280 280 N
E
G
A
T
N
E
E
)
M
M
S
E
,
N
270 270 G
O
Y
I
A
T LEGEND T
N
C
I
A 0.2% ANNUAL CHANCE FLOOD N
D
M U
S
I
O
Y
1% ANNUAL CHANCE FLOOD R
C
U
C
J
N 2% ANNUAL CHANCE FLOOD
L
L E 260 K
L
G
R 10% ANNUAL CHANCE FLOOD A
(
R
O K E
STREAM BED Y
M
E
G H I J M N CROSS SECTION LOCATION L
A
R
250 E
5000 5500 6000 6500 7000 7500 8000 8500 9000 9500 10000 10500 11000 11500 D
E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH WORSTER BROOK 159P149P02P150P