Volume 2 (PDF)

Federal Emergency Management Agency 
FLOOD INSURANCE STUDY NUMBER 
09011CV002B 
  
BOZRAH, TOWN OF 
COLCHESTER, TOWN OF 
EAST LYME, TOWN OF 
FRANKLIN, TOWN OF 
GRISWOLD, TOWN OF 
GROTON LONG POINT ASSOCIATION 
GROTON, CITY OF 
GROTON, TOWN OF 
JEWETT CITY, BOROUGH OF 
LEBANON, TOWN OF 
LEDYARD, TOWN OF 
LISBON, TOWN OF 
LYME, TOWN OF 
MONTVILLE, TOWN OF 
NEW LONDON, CITY OF 
NOANK FIRE DISTRICT 
NORTH STONINGTON, TOWN OF 
NORWICH, CITY OF 
OLD LYME, TOWN OF 
PRESTON, TOWN OF 
SALEM, TOWN OF 
SPRAGUE, TOWN OF 
STONINGTON, BOROUGH OF 
STONINGTON, TOWN OF 
VOLUNTOWN, TOWN OF 
WATERFORD, TOWN OF 
090094 
090095 
090096 
090154 
090173 
090167 
090126 
090097 
090098 
090155 
090157 
090172 
090127 
090099 
090100 
090129 
090101 
090102 
090103 
090139 
090156 
090105 
090193 
090106 
090143 
090107 
 
Volume 2 of 4 
Revised: 
August 5, 2013 
New London County 

 
 
 
 
 
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) 
report may not contain all data available within the repository.  It is advisable to contact the community 
repository for any additional data. 
 
Part or all of this FIS may be revised and republished at any time.  In addition, part of this FIS report may be 
revised by the Letter of Map Revision process, which does not involve republication or redistribution of the 
FIS report.  It is, therefore, the responsibility of the user to consult with community officials and to check 
the community repository to obtain the most current FIS report components. 
 
 
Initial Countywide FIS Effective Date:  July 18, 2011 
 
Revised Countywide FIS Date:  August 5, 2013 
 

i 
 
 
TABLE OF CONTENTS – Volume 1 – August 5, 2013 
 
Page 
 
1.0 
INTRODUCTION 
1 
1.1 
Purpose of Study 
1 
1.2 
Authority and Acknowledgments 
1 
1.3 
Coordination 
7 
 
2.0 
AREA STUDIED 
 9 
2.1 
Scope of Study 
9 
2.2 
Community Description 
19 
2.3 
Principal Flood Problems 
20 
2.4 
Flood Protection Measures 
26 
 
3.0 
ENGINEERING METHODS 
  28 
3.1 
Riverine Hydrologic Analyses 
28 
3.2 
Riverine Hydraulic Analyses 
47 
3.3 
Coastal Hydrologic Analyses 
54 
3.4 
Coastal Hydraulic Analyses 
56 
3.5 
Vertical Datum 
76 
 
4.0 
FLOODPLAIN MANAGEMENT APPLICATIONS 
78 
4.1 
Floodplain Boundaries 
78 
4.2 
Floodways 
80 
 
 
 
FIGURES 
 
Figure 1 – Transect Schematic 
59 
 
Figure 2 – Transect Location Map 
70 
 
Figure 3 – Floodway Schematic 
82 
 
 
 
 
 
 
 

ii 
 
TABLE OF CONTENTS – Volume 1 – continued 
    Page 
 
 
TABLES 
 
Table 1 – CCO Meeting Dates for Precountywide FIS 
7-8 
 
Table 2 – Flooding Sources Studied by Detailed Methods 
9-14 
 
Table 3 – Flooding Sources Studied by Approximate Methods 
15-18 
 
Table 4 – Letters of Map Change 
19 
 
Table 5 – Summary of Discharges 
35-46 
 
Table 6 – Summary of Pond Stillwater Elevations 
46-47 
 
Table 7 – Manning's "n" Values 
52-54 
 
Table 8 – Summary of Coastal Stillwater Elevations 
55 
 
Table 9 – Transect Descriptions 
60-69 
 
Table 10 – Transect Data 
71-76 
 
 
TABLE OF CONTENTS – Volume 2 – August 5, 2013 
 
Page 
 
5.0 
INSURANCE APPLICATIONS 
143 
 
6.0 
FLOOD INSURANCE RATE MAP 
144 
 
7.0 
OTHER STUDIES 
149 
 
8.0 
LOCATION OF DATA 
149 
 
9.0 
BIBLIOGRAPHY AND REFERENCES 
149 
 
 
 TABLES 
Table 11 – Floodway Data 
83-142 
 
Table 12 – Community Map History 
145-148 
 

iii 
 
TABLE OF CONTENTS – Volume 3 – August 5, 2013 
 
 
EXHIBITS 
 
Exhibit 1 - Flood Profiles 
 
Anguilla Brook  
 
 
 
 
 
Panels 1P-4P 
Beaver Brook (Town of Lyme)  
 
 
 
Panels 5P-6P 
Beaver Brook (Town of Sprague) 
  
 
 
Panels 7P-8P 
Birch Plain Creek  
 
 
 
 
 
Panels 9P-12P 
Blissville Brook  
 
 
 
 
 
Panels 13P-15P 
Bobbin Mill Brook   
 
 
 
 
Panel 16P 
Copps Brook  
 
 
 
 
 
Panels 17P-18P 
Day Meadow Brook   
 
 
 
 
Panel 19P 
Denison Brook  
 
 
 
 
 
Panels 20P-21P 
East Branch Eight Mile River  
 
 
 
Panels 22P-24P 
Eccleston Brook  
 
 
 
 
 
Panels 25P-26P 
Eight Mile River  
 
 
 
 
 
Panels 27P-29P 
Fishtown Brook  
 
 
 
 
 
Panels 30P-31P 
Flat Brook   
 
 
 
 
 
Panels 32P-33P 
Ford Brook   
 
 
 
 
 
Panels 34P-36P 
Fort Hill Brook  
 
 
 
 
 
Panels 37P-42P 
Fourmile River  
 
 
 
 
 
Panels 43P-46P 
Gardner Brook  
 
 
 
 
 
Panels 47P-49P 
Goldmine Brook  
 
 
 
 
 
Panel 50P 
Great Meadow Brook  
 
 
 
 
Panels 51P-53P 
Great Plain Brook  
 
 
 
 
 
Panel 54P 
Green Fall River  
 
 
 
 
 
Panels 55P-57P 
Harris Brook  
 
 
 
 
 
Panels 58P-61P 
Hunter Brook  
 
 
 
 
 
Panel 62P 
Jeremy River  
 
 
 
 
 
Panel 63P 
Joe Clark Brook  
 
 
 
 
 
Panels 64P-65P 
Jordan Brook  
 
 
 
 
 
Panels 66P-70P 
Judd Brook   
 
 
 
 
 
Panels 71P-74P 
Latimer Brook  
 
 
 
 
 
Panels 75P-82P 
Little River   
 
 
 
 
 
Panels 83P-84P 
Meadow Brook  
 
 
 
 
 
Panels 85P-88P 
Nevins Brook  
 
 
 
 
 
Panels 89P-90P 
Norwichtown Brook  
 
 
 
 
Panel 91P 
Oxoboxo Brook  
 
 
 
 
 
Panels 92P-95P 
 
 
 
 
 
 
 
 
 
 
 

iv 
 
TABLE OF CONTENTS – Volume 4 – August 5, 2013 
 
 
EXHIBITS – continued 
 
Exhibit 1 - Flood Profiles - continued 
 
Pachaug River  
 
 
 
 
 
Panels 96P-101P 
Pachaug River (Town of Voluntown)                                        Panels 102P-104P 
Pattagansett River   
 
 
 
 
Panels 105P-109P 
Pawcatuck River  
 
 
 
 
 
Panels 110P-111P 
Pine Swamp Brook   
 
 
 
 
Panel 112P 
Quinebaug River  
 
 
 
 
 
Panels 113P-116P 
Shewville Brook  
 
 
 
 
 
Panel 117P 
Shunock River  
 
 
 
 
 
Panels 118P-123P 
Spaulding Pond Brook  
 
 
 
 
Panels 124P-126P 
Susquetonscut Brook (Town of Franklin) 
 
 
Panels 127P-129P 
Susquetonscut Brook (Town of Lebanon)  
 
 
Panels 130P-132P 
Tenmile River  
 
 
 
 
 
Panels 133P-135P 
Thames River and Shetucket River   
 
 
Panel 136P 
Shetucket River  
 
 
 
 
 
Panels 137P-140P 
Trading Cove Brook  
 
 
 
 
Panels 141P-142P 
Tributary A   
 
 
 
 
 
Panels 143P-145P 
Tributary B   
 
 
 
 
 
Panel 146P 
Tributary C   
 
 
 
 
 
Panel 147P 
Tributary D   
 
 
 
 
 
Panel 148P 
Tributary F   
 
 
 
 
 
Panel 149P 
Whitford Brook (Town of Groton)  
 
 
 
Panels 150P-151P 
Whitford Brook (Town of Ledyard)   
 
 
Panel 152P 
Williams Brook  
 
 
 
 
 
Panels 153P-154P 
Yantic River  
 
 
 
 
 
Panels 155P-161P 
Yantic River East Channel                                             
Panel 162P 
 
 
 
 
 
Exhibit 2 - 
Flood Insurance Rate Map Index 
 
Flood Insurance Rate Map 

A
0
50
177
9.0
9.9 2
6.0 3
6.0
0.0
B
345
65
504
3.2
12.1
12.1
12.3
0.2
C
935
270
1447
1.1
14.4
14.4
14.4
0.0
 
D
2285
150
681
2.3
14.5
14.5
14.5
0.0
E
4220
250
1160
1.4
16.2
16.2
17.0
0.8
F
4981
100
884
1.6
22.8
22.8
22.8
0.0
G
5759
140
679
2.4
25.4
25.4
26.0
0.6
H
7899
500
1365
1.2
27.8
27.8
28.8
1.0
I
9329
180
464
3.5
32.8
32.8
33.6
0.8
J
11259
180
493
3.2
35.8
35.8
36.7
0.9
K
12723
120
665
2.4
40.5
40.5
41.5
1.0
L
12862
140
566
2.7
42.6
42.6
42.7
0.1
M
14064
250
1021
1.6
43.0
43.0
43.6
0.6
N
16914
94
392
4.1
47.8
47.8
48.4
0.6
O
17824
45
236
5.1
50.5
50.5
50.5
0.0
P
18594
80
425
2.8
55.9
55.9
56.7
0.8
Q
20844
300
568
2.1
59.9
59.9
60.6
0.7
R
21821
140
799
1.5
63.0
63.0
63.9
0.9
S
22981
60
153
7.5
64.8
64.8
65.2
0.4
T
23951
110
241
5.0
75.8
75.8
76.8
1.0
1
3
2
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
CROSS
SECTION
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
TABLE 12
ANGUILLA BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
REGULATORY
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH WEQUETEQUOCK COVE
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF WAVE EFFECTS
NEW LONDON COUNTY, CT
FLOODWAY DATA
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF BACKWATER EFFECTS FROM FISHERS ISLAND SOUND
TABLE 11

A
2,000
243
1,685
1.1
32.1
32.1
33.1
1.0
B
2,400
199
873
2.0
32.5
32.5
33.5
1.0
C
2,573
107
882
2.0
35.9
35.9
36.9
1.0
 
D
5,173
214
896
2.0
40.7
40.7
41.7
1.0
E
5,323
184
647
2.7
40.9
40.9
41.9
1.0
F
5,428
160
571
3.0
43.1
43.1
44.1
1.0
G
6,328
69
250
6.7
51.7
51.7
52.7
1.0
H
8,528
115
489
3.4
59.1
59.1
60.1
1.0
1
TABLE 12
BEAVER BROOK (TOWN OF LYME)
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
REGULATORY
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH EIGHT MILE RIVER
TABLE 11

A
142
41
186
6.7
83.6
76.6 2
76.9
0.3
B
451
215
254
4.9
83.6
83.5 2
83.5
0.0
C
851
30
178
7.1
87.5
87.5
87.7
0.2
 
D
1,101
37
248
5.1
91.5
91.5
91.5
0.0
E
1,291
130
610
2.1
101.7
101.7
101.7
0.0
F
2,183
38
201
6.2
103.0
103.0
103.6
0.6
G
2,978
87
165
7.6
108.9
108.9
109.0
0.1
H
3,237
160
1,356
0.8
125.1
125.1
126.0
0.9
I
3,986
39
191
6.6
126.0
126.0
126.3
0.3
J
6,426
243
863
1.5
131.5
131.5
132.3
0.8
K
6,698
240
1,330
0.9
134.2
134.2
134.8
0.6
L
7,440
172
729
1.7
134.3
134.3
134.9
0.6
1
2
TABLE 12
BEAVER BROOK (TOWN OF SPRAGUE)
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
REGULATORY
NEW LONDON COUNTY, CT
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH SHETUCKET RIVER
ELEVATIONS COMPUTED WITHOUT CONSIDERING BACKWATER EFFECTS FROM SHETUCKET RIVER
TABLE 11

A
190
20
210
3.8
9.6 2
8.3 3
8.3
0.0
B
610
40
275
2.9
9.6 2
8.7 3
8.7
0.0
C
840
290
3,588
0.1
9.6 2
8.7 3
9.1
0.4
 
D
1,420
280
2,815
0.2
9.6 2
8.7 3
9.1
0.4
E
2,120
100
1,211
0.4
9.6 2
8.7 3
9.1
0.4
F
2,770
40
389
1.2
9.6 2
8.7 3
9.2
0.5
G
4,270
40
495
0.9
9.6 2
8.7 3
9.2
0.5
H
5,250
40
391
1.2
9.6 2
8.7 3
9.3
0.6
I
6,290
70
519
0.9
9.6 2
8.7 3
9.4
0.7
J
6,390
40
284
1.1
9.6 2
8.7 3
9.4
0.7
K
6,660
310
522
0.6
9.7
9.7
9.7
0.0
L
6,985
260
2,895
0.1
27.7
27.7
27.7
0.0
M
7,645
185
1,391
0.2
27.7
27.7
27.7
0.0
N
8,115
35
77
3.9
27.7
27.7
27.7
0.0
O
8,465
20
42
7.2
39.1
39.1
39.1
0.0
1
2
3
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
CROSS
SECTION
WITH 
FLOODWAY
INCREASE
TABLE 12
BIRCH PLAIN CREEK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
REGULATORY
WITHOUT 
FLOODWAY
NEW LONDON COUNTY, CT
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH BAKER COVE
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF WAVE EFFECTS
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF BACKWATER EFFECTS FROM FISHERS ISLAND SOUND
TABLE 11

A
200
34
109
4.2
36.5
23.1 2
24.1
1.0
B
700
127
188
2.4
36.5
25.9 2
26.1
0.2
C
1,121
15
82
5.6
36.5
31.5 2
31.6
0.1
 
D
1,561
8
37
12.3
46.2
46.2
47.0
0.8
E
2,001
43
174
2.7
71.5
71.5
71.5
0.0
F
2,975
83
277
1.7
82.6
82.6
82.6
0.0
G
5,737
246
1,334
0.3
93.3
93.3
93.6
0.3
H
7,499
39
103
4.5
95.3
95.3
95.5
0.2
I
8,167
24
53
8.7
99.6
99.6
99.6
0.0
J
9,047
49
159
2.5
105.2
105.2
105.2
0.0
K
11,677
85
84
4.8
118.1
118.1
118.1
0.0
L
13,327
24
109
3.7
123.2
123.2
123.5
0.3
1
2
TABLE 12
BLISSVILLE BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH SHETUCKET RIVER
ELEVATIONS COMPUTED WITHOUT CONSIDERING BACKWATER EFFECTS FROM SHETUCKET RIVER 
TABLE 11

A
449
110
945
0.3
87.1
87.1
87.1
0.0
B
1,579
50
50
6.0
91.8
91.8
91.8
0.0
C
1,790
70
125
2.4
103.9
103.9
103.9
0.0
 
D
2,307
40
45
6.7
118.2
118.2
118.3
0.1
1
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH YANTIC RIVER
NEW LONDON COUNTY, CT
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
TABLE 12
BOBBIN MILL BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
TABLE 11

A
0
250
1175
1.3
9.8 2
3.8 3
3.8
0.0
B
1766
200
445
3.4
9.8 2
9.6
10.2
0.6
C
2872
140
528
2.6
14.7
14.7
15.6
0.9
 
D
3962
98
439
3.4
20.4
20.4
20.5
0.1
E
4452
90
232
6.6
21.7
21.7
21.7
0.0
F
4614
60
206
7.3
25.5
25.5
25.6
0.1
G
5444
295
787
1.9
44.3
44.3
44.3
0.0
H
6594
470
1291
1.2
44.3
44.3
44.3
0.0
I
7694
55
160
9.4
44.6
44.6
44.6
0.0
1
3
2
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
CROSS
SECTION
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF BACKWATER EFFECTS FROM FISHERS ISLAND SOUND
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
TABLE 12
COPPS BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
REGULATORY
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
STREAM DISTANCE IN FEET ABOVE QUIAMBOG COVE
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF WAVE EFFECTS
NEW LONDON COUNTY, CT
(ALL JURISDICTIONS)
TABLE 11

A
-90
75
237
9.7
161.2
161.2
161.2
0.0
B
60
75
282
8.1
163.5
163.5
163.5
0.0
C
915
75
235
9.8
170.7
170.7
170.7
0.0
 
D
2,383
63
229
10.0
185.6
185.6
185.9
0.3
E
3,770
75
345
6.7
194.4
194.4
194.5
0.1
F
4,705
100
251
9.2
200.6
200.6
200.7
0.1
G
6,082
300
1,110
2.1
203.9
203.9
204.3
0.4
H
7,372
400
1,498
1.5
204.4
204.4
205.1
0.7
I
8,688
680
2,181
1.1
204.8
204.8
205.7
0.9
J
9,573
700
1,872
1.2
205.3
205.3
206.0
0.7
K
9,691
400
1,011
2.3
205.4
205.4
206.0
0.6
L
10,065
310
1,545
1.5
208.4
208.4
208.4
0.0
M
11,192
400
1,267
1.8
208.6
208.6
208.6
0.0
N
12,770
600
1,200
1.9
209.6
209.6
210.0
0.4
O
13,350
700
1,632
1.4
209.8
209.8
210.8
1.0
P
13,885
75
240
9.6
211.1
211.1
211.2
0.1
Q
14,060
75
404
4.6
213.3
213.3
213.3
0.0
R
14,242
200
567
3.3
213.5
213.5
213.5
0.0
S
15,060
441
814
2.3
214.2
214.2
215.2
1.0
1
TABLE 12
EAST BRANCH EIGHT MILE RIVER
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE DARLING ROAD
TABLE 11

A
195 1
50
328
3.1
9.7 3
7.8 4
7.8
0.0
B
1,195 1
180
720
1.4
9.7 3
8.6 4
9.6
1.0
C
1,646 1
50
161
6.4
10.8
10.8
11.0
0.2
 
D
1,848 1
50
249
4.1
13.2
13.2
13.2
0.0
E-M
*
*
*
*
*
*
*
*
N
5,450 2
40
100
7.2
33.8
33.8
34.8
1.0
O
5,810 2
95
571
0.9
35.2
35.2
36.2
1.0
CROSS
SECTION
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
1
3
2
*
4
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF WAVE EFFECTS;
PLEASE REFER TO THE ASSOCIATED DFIRM PANEL FOR BASE FLOOD ELEVATIONS
(ALL JURISDICTIONS)
FEET ABOVE PALMER COVE
TABLE 11
ECCLESTON BROOK
FLOODWAY DATA
  FEDERAL EMERGENCY MANAGEMENT AGENCY
FEET ABOVE STATE ROUTE 215
FLOODWAY DATA NOT AVAILABLE. CROSS SECTIONS ARE SHOWN ON FIRM FOR REFERENCE.
NEW LONDON COUNTY, CT
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF BACKWATER EFFECTS FROM FISHERS ISLAND SOUND

A
11,690
128
1,802
5.7
12.3
12.3
13.3
1.0
B
13,290
297
3,053
3.4
13.9
13.9
14.9
1.0
C
15,890
242
1,872
5.5
19.9
19.9
20.9
1.0
 
D
16,990
104
1,234
8.3
24.1
24.1
25.1
1.0
E
17,166
78
671
15.2
31.3
31.3
31.8
0.5
F
19,666
185
1,569
5.6
32.7
32.7
33.7
1.0
G
20,746
484
3,876
2.3
36.1
36.1
37.1
1.0
H
20,841
232
2,308
3.8
36.8
36.8
37.8
1.0
I
22,491
339
2,813
3.1
38.2
38.2
39.2
1.0
J
26,141
221
1,649
5.4
46.3
46.3
47.3
1.0
K
28,641
533
2,909
3.0
49.6
49.6
50.6
1.0
L
30,141
318
1,948
4.6
53.4
53.4
54.4
1.0
M
30,685
287
2,169
2.1
56.0
56.0
57.0
1.0
1
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH CONNECTICUT RIVER
WITHOUT 
FLOODWAY
REGULATORY
INCREASE
EIGHT MILE RIVER
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
WITH 
FLOODWAY
TABLE 12
NEW LONDON COUNTY, CT
TABLE 11

A
310
115
814
1.3
20.9
20.9
21.9
1.0
B
930
110
669
1.6
21.4
21.4
22.4
1.0
C
1,560
65
447
2.2
22.3
22.3
23.3
1.0
 
D
2,140
40
106
6.2
24.8
24.8
25.8
1.0
E
2,540
45
233
3.1
25.6
25.6
26.6
1.0
F
3,370
95
879
1.1
27.8
27.8
28.8
1.0
G
4,450
45
154
4.7
28.2
28.2
29.2
1.0
CROSS
SECTION
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
1
(ALL JURISDICTIONS)
FEET ABOVE CONFLUENCE WITH ECCLESTON BROOK
NEW LONDON COUNTY, CT
TABLE 12
FISHTOWN BROOK
FLOODWAY DATA
  FEDERAL EMERGENCY MANAGEMENT AGENCY
TABLE 11

A
2,804
18
43
8.8
19.3
19.3
19.3
0.0
B
3,293
23
71
5.3
30.9
30.9
31.0
0.1
C
3,453
22
46
8.3
34.0
34.0
34.0
0.0
 
D
3,836
227
99
3.8
45.6
45.6
45.6
0.0
E
3,906
227
896
0.4
45.9
45.9
45.9
0.0
F
4,646
21
51
7.5
49.4
49.4
49.6
0.2
G
4,842
114
376
1.0
53.7
53.7
54.0
0.3
H
4,979
165
528
0.7
54.3
54.3
55.3
1.0
I
5,083
180
576
0.7
55.3
55.3
56.3
1.0
1
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH MILL COVE
NEW LONDON COUNTY, CT
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
TABLE 12
FLAT BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
TABLE 11

A
322
30
185
4.4
28.8
28.8
29.6
0.8
B
1,658
50
185
4.4
42.6
42.6
43.1
0.5
C
2,999
80
250
2.3
52.9
52.9
52.9
0.0
 
D
4,324
40
245
2.3
59.4
59.4
60.2
0.8
E
5,565
130
360
1.6
59.7
59.7
60.7
1.0
F
5,665
70
85
6.5
63.6
63.6
63.7
0.1
G
6,558
410
2,395
0.2
64.0
64.0
64.0
0.0
H
9,024
40
235
0.7
99.4
99.4
99.4
0.0
I
10,169
30
115
1.4
99.4
99.4
99.7
0.3
1
TABLE 12
FORD BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH TRADING COVE BROOK
TABLE 11

A
630
50
328
1.7
9.7 2
7.1 3
7.1
0.0
B
1,290
40
205
2.7
9.7 2
7.1 3
7.3
0.2
C
2,275
100
395
1.4
9.7 2
7.7 3
8.0
0.3
 
D
3,524
100
246
2.3
10.4
10.4
10.6
0.2
E
5,024
100
281
2.0
11.1
11.1
11.6
0.5
F
6,364
80
355
1.4
12.7
12.7
13.2
0.5
G
7,874
80
169
2.9
13.8
13.8
14.8
1.0
H
8,594
80
104
4.7
42.8
42.8
42.8
0.0
I
10,524
32
58
8.4
68.6
68.6
68.6
0.0
J
12,164
80
263
1.9
74.2
74.2
74.6
0.4
K
13,444
21
54
9.1
87.5
87.5
87.5
0.0
1
2
3
FLOODING SOURCE
DISTANCE1
CROSS
SECTION
INCREASE
TABLE 12
FORT HILL BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF BACKWATER EFFECTS FROM FISHERS ISLAND SOUND
NEW LONDON COUNTY, CT
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH MUMFORD COVE
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF WAVE EFFECTS
SECTION
AREA
(SQUARE FEET)
(ALL JURISDICTIONS)
TABLE 11

A
1,030
50
378
2.4
9.3 2
3.3 3
3.4
0.1
B
2,570
50
416
2.2
9.3 2
3.3 3
3.7
0.4
C
3,970
40
236
3.9
9.3 2
4.2 3
4.7
0.5
 
D
5,020
30
235
3.7
9.3 2
8.2 3
8.5
0.3
E
6,400
40
96
9.0
11.0
11.0
11.2
0.2
F
6,645
70
492
1.7
23.8
23.8
24.7
0.9
G
7,745
35
184
4.7
25.2
25.2
26.1
0.9
H
8,545
35
93
9.3
40.6
40.6
40.6
0.0
I
8,855
17
150
5.7
48.7
48.7
48.7
0.0
J
9,295
20
179
4.8
50.1
50.1
50.6
0.5
K
10,065
150
865
1.0
51.3
51.3
52.2
0.9
L
10,825
80
283
2.9
51.3
51.3
52.3
1.0
M
11,485
80
435
1.9
52.1
52.1
52.8
0.7
N
12,185
50
338
2.5
53.9
53.9
54.3
0.4
O
13,245
40
217
3.8
53.9
53.9
54.8
0.9
P
13,935
40
453
1.8
55.2
55.2
55.7
0.5
Q
14,655
50
175
4.7
58.0
58.0
58.7
0.7
R
16,105
50
201
4.1
61.6
61.6
62.4
0.8
S
17,155
50
167
5.0
64.8
64.8
65.6
0.8
T
18,925
50
159
5.2
72.4
72.4
73.4
1.0
1
2
3
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH LONG ISLAND SOUND
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF WAVE EFFECTS
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF BACKWATER EFFECTS FROM LONG ISLAND SOUND
NEW LONDON COUNTY, CT
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
TABLE 12
FOURMILE RIVER
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
TABLE 11

A
145
46
433
3.5
154.9
154.9
155.9
1.0
B
460
68
579
2.6
155.1
155.1
156.0
0.9
C
700
401
4,072
0.4
155.3
155.3
156.2
0.9
 
D
830
431
4,532
0.3
156.0
156.0
156.8
0.8
E
1,310
706
7,671
0.2
156.0
156.0
156.8
0.8
F
2,122
601
5,931
0.3
156.0
156.0
156.8
0.8
G
2,945
61
463
3.2
156.0
156.0
156.8
0.8
H
3,465
60
335
4.5
156.1
156.1
156.9
0.8
I
4,235
61
332
4.5
156.7
156.7
157.7
1.0
J
5,010
51
141
10.6
159.4
159.4
159.4
0.0
K
5,180
90
245
6.1
163.1
163.1
163.1
0.0
L
5,568
70
244
6.2
163.6
163.6
164.5
0.9
M
5,695
140
851
1.8
168.9
168.9
168.9
0.0
N
6,260
190
779
1.9
169.0
169.0
169.0
0.0
O
6,988
100
206
7.3
171.1
171.1
171.1
0.0
P
8,662
*
196
7.6
180.4
180.4
181.2
0.8
Q
8,788
35
249
6.0
184.2
184.2
184.2
0.0
R
9,615
81
573
2.6
184.8
184.8
184.9
0.1
S
11,115
36
119
10.5
193.3
193.3
193.3
0.0
T
11,265
46
296
4.2
196.1
196.1
196.1
0.0
U
11,550
51
268
4.7
196.3
196.3
196.4
0.1
V
11,900
26
108
11.6
197.5
197.5
197.5
0.0
W
12,200
26
164
7.6
200.8
200.8
200.9
0.1
X
12,575
31
122
10.2
202.8
202.8
202.8
0.0
Y
13,285
66
263
4.8
205.9
205.9
206.4
0.5
Z
13,535
131
462
2.7
206.4
206.4
207.0
0.6
AA
13,685
31
196
6.4
211.0
211.0
211.0
0.0
1
*
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH YANTIC RIVER
FLOODWAY COINCIDENT WITH CHANNEL BANKS
NEW LONDON COUNTY, CT
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
TABLE 12
GARDNER BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
TABLE 11

A
602
70
130
4.9
69.8
69.8
69.8
0.0
B
1,336
60
250
2.6
76.9
76.9
76.9
0.0
 
1
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH TRADING COVE BROOK
NEW LONDON COUNTY, CT
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
TABLE 12
GOLDMINE BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
TABLE 11

A
428
31
78
9.0
36.9
36.9
36.9
0.0
B
1,331
26
135
3.5
74.4
74.4
74.8
0.4
C
1,943
19
54
9.5
78.1
78.1
78.1
0.0
 
D
3,210
140
115
4.5
85.0
85.0
85.0
0.0
E
4,050
100
450
1.1
86.5
86.5
87.5
1.0
F
5,359
70
250
1.2
88.9
88.9
89.0
0.1
1
TABLE 12
GREAT PLAIN BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH TRADING COVE BROOK
TABLE 11

A
7,170
80
399
4.9
54.6
54.6
54.9
0.3
B
9,010
100
370
5.3
60.9
60.9
61.3
0.4
C
11,170
80
377
5.2
64.6
64.6
64.8
0.2
 
D
13,705
55
249
6.4
68.8
68.8
69.5
0.7
E
13,904
25
207
7.7
69.8
69.8
70.1
0.3
F
14,644
50
262
6.1
72.9
72.9
73.4
0.5
G
14,880
75
399
4.0
74.1
74.1
74.5
0.4
H
15,240
70
162
8.3
75.2
75.2
75.5
0.3
I
15,420
100
419
3.2
76.7
76.7
77.6
0.9
1
TABLE 12
GREEN FALL RIVER
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
CROSS
SECTION
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
REGULATORY
NEW LONDON COUNTY, CT
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE WELLSTOWN ROAD
TABLE 11

A
327
97
165
6.1
214.9
214.9
215.9
1.0
B
522
100
295
3.4
218.9
218.9
218.9
0.0
C
1,370
38
105
9.5
222.0
222.0
222.0
0.0
 
D
2,292
39
156
6.4
229.0
229.0
229.1
0.1
E
4,400
46
210
4.8
236.5
236.5
237.2
0.7
F
4,822
114
426
2.3
237.3
237.3
238.2
0.9
G
5,932
30
97
10.3
245.1
245.1
245.1
0.0
H
6,150
58
121
8.3
256.7
256.7
257.0
0.3
I
6,740
48
192
5.2
259.9
259.9
260.7
0.8
J
7,212
40
146
6.9
261.9
261.9
262.2
0.3
K
7,335
35
270
3.7
265.0
265.0
265.0
0.0
L
8,190
56
396
1.4
265.0
265.0
265.4
0.4
M
8,840
60
269
2.0
265.0
265.0
265.5
0.5
N
8,990
60
337
1.6
266.4
266.4
267.0
0.6
O
9,815
60
270
2.0
266.4
266.4
267.2
0.8
P
9,968
170
188
2.9
266.5
266.5
267.3
0.8
Q
10,778
180
318
1.7
267.8
267.8
268.8
1.0
R
12,020
100
115
4.7
272.5
272.5
272.9
0.4
S
12,920
35
95
5.8
278.9
278.9
279.6
0.7
T
13,050
45
251
2.2
284.0
284.0
284.0
0.0
U
13,400
30
79
6.9
285.0
285.0
285.7
0.7
V
13,600
22
59
9.4
289.8
289.8
289.8
0.0
W
13,675
145
1,300
0.4
299.8
299.8
299.8
0.0
X
14,190
35
105
5.3
299.8
299.8
299.8
0.0
Y
15,020
45
122
4.5
301.8
301.8
302.8
1.0
Z
15,980
30
133
4.1
304.7
304.7
305.2
0.5
AA
17,030
93
318
1.7
305.5
305.5
306.3
0.8
1
DISTANCE1
TABLE 12
HARRIS BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
WITH 
FLOODWAY
INCREASE
REGULATORY
WITHOUT 
FLOODWAY
NEW LONDON COUNTY, CT
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH EAST BRANCH EIGHTMILE RIVER
TABLE 11

AB
18,040
35
92
6.0
307.3
307.3
307.5
0.2
 
1
  FEDERAL EMERGENCY MANAGEMENT AGENCY
NEW LONDON COUNTY, CT
(ALL JURISDICTIONS)
REGULATORY
TABLE 12
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
HARRIS BROOK
FLOODING SOURCE
FLOODWAY
FEET ABOVE CONFLUENCE WITH EAST BRANCH EIGHTMILE RIVER
INCREASE
FLOODWAY DATA
CROSS
SECTION
DISTANCE1
WIDTH
(FEET)
SECTION
AREA
(SQUARE FEET)
MEAN
VELOCITY
(FEET PER SECOND)
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
TABLE 11

A
120
50
403
0.8
35.4
32.4 2
32.4
0.0
B
500
50
265
1.2
35.4
32.4 2
32.4
0.0
C
1,305
50
173
1.8
35.4
32.4 2
32.6
0.2
 
D
1,690
10
57
5.6
35.4
33.0 2
33.7
0.7
E
1,935
28
87
3.7
35.6
35.6
35.8
0.2
F
1,960
46
108
3.0
41.2
41.2
41.6
0.4
G
2,220
20
61
5.3
42.8
42.8
42.9
0.1
H
2,305
22
82
3.9
44.7
44.7
45.4
0.7
I
2,455
17
93
3.4
47.3
47.3
47.7
0.4
J
2,500
48
303
1.1
49.3
49.3
49.5
0.2
K
2,960
30
131
2.4
51.9
51.9
51.9
0.0
L
3,065
7
40
8.1
52.1
52.1
52.2
0.1
M
3,090
8
59
5.4
53.9
53.9
54.6
0.7
N
3,200
12
82
3.9
54.7
54.7
55.3
0.6
O
3,300
24
42
7.6
57.2
57.2
57.2
0.0
P
3,500
30
62
5.2
67.5
67.5
67.6
0.1
Q
4,000
80
179
1.8
70.8
70.8
71.7
0.9
1
2
NEW LONDON COUNTY, CT
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH SHETUCKET RIVER
ELEVATIONS COMPUTED WITHOUT CONSIDERING BACKWATER EFFECTS FROM SHETUCKET RIVER
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
TABLE 12
HUNTER BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
TABLE 11

A
4,600
40
340
14.1
234.9
234.9
235.9
1.0
B
8,300
86 / 45 2
1,116
2.7
244.4
244.4
245.3
0.9
 
1
2
TABLE 12
JEREMY RIVER
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE STATE ROUTE 149
WIDTH / WIDITH WITHIN NEW LONDON COUNTY
TABLE 11

A
100
32
216
3.3
11.9
6.7 2
7.7
1.0
B
233
20
79
7.7
11.9
6.8 2
7.7
0.9
C
560
20
61
10.0
15.9
15.9
16.2
0.3
 
D
1,453
45
141
5.3
20.8
20.8
21.7
0.9
E
1,803
26
66
9.2
24.7
24.7
24.7
0.0
F
2,088
15
55
11.0
29.8
29.8
29.8
0.0
G
2,423
71
288
2.4
31.3
31.3
31.3
0.0
H
3,523
90
311
2.3
32.1
32.1
33.0
0.9
I
3,643
44
151
4.5
32.1
32.1
33.1
1.0
J
4,343
135
263
3.0
34.0
34.0
34.9
0.9
K
4,673
75
184
4.2
34.8
34.8
35.8
1.0
L
4,878
28
95
7.2
36.3
36.3
36.6
0.3
M
6,458
22
63
9.7
42.9
42.9
42.9
0.0
N
7,318
55
245
2.5
47.3
47.3
48.2
0.9
O
7,578
63
148
4.1
48.4
48.4
49.2
0.8
P
8,028
37
105
7.0
52.5
52.5
53.0
0.5
Q
8,428
54
136
5.5
54.9
54.9
55.7
0.8
R
8,738
66
137
4.5
57.3
57.3
57.3
0.0
1
2
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH POQUETANUCK COVE
ELEVATIONS COMPUTED WITHOUT CONSIDERING BACKWATER EFFECTS FROM POQUETANUCK COVE
NEW LONDON COUNTY, CT
(ALL JURISDICTIONS)
REGULATORY
WITH 
FLOODWAY
INCREASE
CROSS
SECTION
WITHOUT 
FLOODWAY
TABLE 12
JOE CLARK BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
TABLE 11

A
50
100
221
6.8
9.8
9.7 2
9.7
0.0
B
1,300
350
2,402
0.6
14.9
14.9
15.9
1.0
C
2,400
350
2,417
0.3
14.9
14.9
15.9
1.0
 
D
3,930
130
480
1.5
15.1
15.1
16.1
1.0
E
5,800
40
228
3.2
27.9
27.9
28.1
0.2
F
6,590
36
163
4.5
30.4
30.4
30.6
0.2
G
7,620
82
138
5.3
31.7
31.7
32.7
1.0
H
9,120
140
916
0.8
35.1
35.1
35.6
0.5
I
10,830
120
229
3.2
44.5
44.5
45.0
0.5
J
12,155
40
127
5.8
53.3
53.3
53.3
0.0
K
13,470
38
124
5.9
61.1
61.1
61.1
0.0
L
15,120
150
1,055
0 6
62.9
62.9
63.4
0.5
M
17,740
100
219
2 7
77.6
77.6
78.0
0.4
N
19,440
60
90
4.8
90.0
90.0
90.1
0.1
O
21,560
82
114
3.8
103.3
103.3
103.3
0.0
P
22,860
40
107
4.0
108.4
108.4
108.9
0.5
Q
24,265
50
141
3.0
117.3
117.3
117.9
0.6
R
25,825
50
119
3.6
117.7
117.7
118.5
0.8
S
27,105
50
78
5.5
120.6
120.6
121.1
0.5
1
2
TABLE 12
JORDAN BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
CROSS
SECTION
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
REGULATORY
NEW LONDON COUNTY, CT
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH JORDAN COVE
ELEVATIONS COMPUTED WITHOUT CONSIDERING BACKWATER EFFECTS FROM LONG ISLAND SOUND
TABLE 11

A
20
177 / 37 2
442
1.4
343.3
343.3
343.3
0.0
B
2,500
82
73
5.5
354.9
354.9
354.9
0.0
C
3,150
14
41
9.7
366.0
366.0
366.3
0.3
 
D
4,250
55
72
5.5
392.8
392.8
392.9
0.1
E
6,350
132
406
0.5
410.5
410.5
410.5
0.0
F
7,600
519
1,742
0.1
410.5
410.5
410.5
0.0
G
11,100
75
212
0.9
410.5
410.5
410.5
0.0
H
13,350
140
1,466
0.1
429.4
429.4
429.4
0.0
I
14,690
22
41
4.9
458.6
458.6
458.6
0.0
J
16,900
52
40
5.0
491.8
491.8
491.8
0.0
1
2
TABLE 12
JUDD BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE OLD HEBRON ROAD
WIDTH / WIDTH WITHIN NEW LONDON COUNTY
TABLE 11

A
240
107
631
3.3
9.4 2
3.9 3
4.9
1.0
B
1380
45
229
9.2
9.4 2
8.9 3
9.7
0.8
C
2880
60
212
9.9
31.7
31.7
31.7
0.0
 
D
3,295
115
281
7.5
42.1
42.1
42.1
0.0
E
4,000
55
562
3.7
46.3
46.3
46.4
0.1
F
4,980
150
745
2.8
46.4
46.4
46.6
0.2
G
6,030
200
677
3.1
46.9
46.9
47.5
0.6
H
7,580
200
651
3.2
49.2
49.2
49.9
0.7
I
9,080
120
508
4.1
55.4
55.4
56.4
1.0
J
10,130
220
941
2.2
57.8
57.8
58.7
0.9
K
11,450
170
673
3.1
60.8
60.8
61.8
1.0
L
13,010
120
1020
2.1
69.0
69.0
69.0
0.0
M
14,070
120
856
2.5
69.1
69.1
69.3
0.2
N
15,920
120
689
3.0
69.2
69.2
70.1
0.9
O
17,520
650
3576
0.6
70.2
70.2
71.0
0.8
P
18,580
170
567
3.7
70.6
70.6
71.4
0.8
Q
20,010
125
641
3.3
73.9
73.9
74.9
1.0
R
20,950
125
795
2.6
77.3
77.3
77.7
0.4
S
22,070
286
1248
1.7
77.7
77.7
78.7
1.0
T
23,300
85
371
5.3
80.1
80.1
80.8
0.7
U
23,499
135
694
2.8
82.1
82.1
82.8
0.7
V
24,990
56
387
5.1
90.2
90.2
91.1
0.9
W
26,015
31
256
7.7
93.8
93.8
94.4
0.6
X
26,818
73
405
4.9
96.3
96.3
96.9
0.6
Y
27,420
58
220
8.9
100.2
100.2
100.8
0.6
Z
30,945
121
699
2.8
124.6
124.6
125.5
0.9
AA
32,413
192
1082
1.8
126.7
126.7
127.5
0.8
1
2
3
SECTION
AREA
(SQUARE FEET)
NEW LONDON COUNTY, CT
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH NIANTIC RIVER
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF WAVE EFFECTS
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF BACKWATER EFFECTS FROM NIANTIC RIVER
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
TABLE 12
LATIMER BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
FLOODING SOURCE
DISTANCE1
TABLE 11

AB
34,617
185
1,128
1.7
129.5
129.5
130.3
0.8
AC
37,285
103
372
5.1
132.9
132.9
133.7
0.8
AD
38,875
201
913
2.1
139.0
139.0
140.0
1.0
 
AE
39,085
260
1,368
1.4
141.2
141.2
141.7
0.5
AF
39,706
332
1,811
0.9
143.9
143.9
144.8
0.9
AG
41,006
216
1,286
1.2
148.8
148.8
149.7
0.9
1
REGULATORY
FLOODWAY DATA
INCREASE
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH NIANTIC RIVER
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
CROSS
SECTION
DISTANCE1
WIDTH
(FEET)
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
FLOODWAY
LATIMER BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
TABLE 12
  FEDERAL EMERGENCY MANAGEMENT AGENCY
NEW LONDON COUNTY, CT
(ALL JURISDICTIONS)
TABLE 11

A
1,625
178
797
6.0
63.9
63.9
64.8
0.9
B
2,235
269
333
14.3
66.9
66.9
67.1
0.2
C
2,695
95
736
6.5
71.8
71.8
72.2
0.4
 
D
3,780
293
3,134
1.5
82.5
82.5
82.5
0.0
E
7,195
410
1,500
3.2
82.9
82.9
83.0
0.1
F
7,850
79
439
10.9
83.9
83.9
84.1
0.2
G
8,725
113
842
5.7
91.2
91.2
91.2
0.0
H
9,760
257
779
6.1
92.6
92.6
92.6
0.0
I
11,530
70
494
9.7
97.0
97.0
97.1
0.1
1
TABLE 12
LITTLE RIVER
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH SHETUCKET RIVER
TABLE 11

A
0
51
486
3.7
243.1
243.1
243.9
0.8
B
1,600
81
584
3.1
243.9
243.9
244.7
0.8
C
3,000
149
432
4.2
245.0
245.0
245.7
0.7
 
D
3,140
163
852
2.1
248.6
248.6
248.7
0.1
E
5,100
162
429
4.2
250.1
250.1
250.5
0.4
F
6,700
368
382
4.7
254.7
254.7
254.7
0.0
G
10,500
447
1,921
0.7
264.9
264.9
265.2
0.3
H
11,750
275
262
5.4
269.0
269.0
269.0
0.0
I
12,600
34
136
10.3
274.7
274.7
275.2
0.5
1
TABLE 12
MEADOW BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH JEREMY RIVER
TABLE 11

A
1,480
50
86
5.1
15.5
15.5
15.7
0.2
B
2,040
40
208
2.1
20.6
20.6
20.6
0.0
C
4,110
60
105
4 2
24.3
24.3
24.3
0.0
 
D
6,650
30
103
4.3
29.7
29.7
30.6
0.9
E
7,225
40
222
1.6
32.8
32.8
32.9
0.1
F
9,120
40
145
2.4
32.8
32.8
33.7
0.9
G
10,050
50
263
1.3
40.2
40.2
40.2
0.0
H
11,660
30
74
4.8
45.4
45.4
45.6
0.2
1
TABLE 12
NEVINS BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
REGULATORY
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH JORDAN BROOK
TABLE 11

A
400
40
*
*
*
*
*
*
B
1,455
40
*
*
*
*
*
*
C
1,605
50
150
3.6
92.1
92.1
92.9
0.8
 
D
1,745
60
330
1.6
92.3
92.3
93.3
1.0
E
2,015
50
220
2.4
92.4
92.4
93.3
0.9
F
2,250
50
190
2.8
93.8
93.8
94.2
0.4
1
*
TABLE 12
NORWICHTOWN BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH YANTIC RIVER
DATA NOT AVAILABLE
TABLE 11

A
75
65
324
5.2
11.6
4.6 2
4.6
0.0
B
730
220
815
2.1
18.0
18.0
18.0
0.0
C
1,734
115
457
3.7
24.4
24.4
24.4
0.0
 
D
2,419
60
196
8.7
29.5
29.5
29.8
0.3
E
2,709
180
653
2.6
48.2
48.2
48.2
0.0
F
2,964
170
581
2.9
66.3
66.3
66.3
0.0
G
4,099
50
318
5.4
69.3
69.3
69.3
0.0
H
5,634
70
396
4.3
69.6
69.6
69.7
0.1
I
6,404
215
438
3.9
73.3
73.3
73.3
0.0
J
7,025
37
425
4.0
91.0
91.0
91.6
0.6
K
7,180
140
269
6.3
115.1
115.1
115.1
0.0
L
9,058
90
207
8.2
120.7
120.7
120.7
0.0
M
10,385
45
250
6.8
166.5
166.5
167.4
0.9
N
10,835
60
193
8.8
168.6
168.6
168.6
0.0
O
11,655
120
526
3.2
187.5
187.5
187.5
0.0
P
12,505
43
154
11.0
196.9
196.9
196.9
0.0
Q
12,825
55
169
10.0
206.6
206.6
206.6
0.0
R
12,965
32
141
12.0
213.4
213.4
213.4
0.0
S
13,585
70
182
9.3
225.6
225.6
226.1
0.5
1
2
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH HORTON COVE
ELEVATIONS COMPUTED WITHOUT CONSIDERING BACKWATER EFFECTS FROM THAMES RIVER
NEW LONDON COUNTY, CT
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
TABLE 12
OXOBOXO BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
TABLE 11

A
820
80
416
5.2
84.7
79.7 2
80.5
0.8
B
1,427
94
726
3.0
89.4
89.4
89.4
0.0
C
2,362
160
1,116
1.9
109.2
109.2
109.2
0.0
 
D
3,680
72
535
4.0
109.7
109.7
109.7
0.0
E
4,396
445
2,963
0.7
127.7
127.7
127.7
0.0
F
4,796
825
5,050
0.4
127.7
127.7
127.7
0.0
G
7,955
521
2,516
0.9
127.8
127.8
127.8
0.0
H
9,945
260
941
2.3
128.0
128.0
128.0
0.0
I
10,285
400
3,295
0.7
132.3
132.3
132.3
0.0
J
13,255
120
890
2.4
133.0
133.0
133.3
0.3
K
13,987
84
658
3.3
133.3
133.3
133.5
0.2
L
14,807
126
757
2.8
133.7
133.7
134.1
0.4
M
15,527
109
626
3.0
138.4
138.4
138.4
0.0
N
15,955
305
2,122
0.9
150.8
150.8
150.8
0.0
O
16,376
509
5,277
0.4
151.0
151.0
151.0
0.0
P
25,061
345
3,845
0.5
151.3
151.3
151.3
0.0
Q
32,109
206
1,597
1.2
152.2
152.2
152.2
0.0
R
34,283
81
924
2.0
152.9
152.9
153.0
0.1
S
35,313
120
234
8.0
158.8
158.8
158.8
0.0
1
4
TABLE 12
PACHAUG RIVER
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
REGULATORY
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH QUINEBAUG RIVER
ELEVATIONS COMPUTED WITHOUT CONSIDERING BACKWATER EFFECTS FROM QUINEBAUG RIVER
TABLE 11

A
1,250
360
1,897
0.6
9.4 2
3.4 3
3.4
0.0
B
3,070
130
573
2.1
9.4 2
3.6 3
3.6
0.0
C
5,070
70
503
2.4
9.4 2
3.8 3
4.1
0.3
 
D
7,320
70
375
3.2
9.4 2
3.8 3
4.4
0.6
E
9,620
130
577
1.7
10.2
10.2
10.8
0.6
F
10,270
100
364
2.7
12.0
12.0
12.2
0.2
G
11,670
150
487
2.1
13.5
13.5
14.4
0.9
H
12,430
200
1,365
0.7
18.8
18.8
18.8
0.0
I
13,740
60
185
5.4
19.4
19.4
20.1
0.7
J
14,220
120
531
1.9
24.5
24.5
24.6
0.1
K
14,735
180
322
3.1
27.6
27.6
27.6
0.0
L
15,655
460
935
1.1
27.6
27.6
27.7
0.1
M
17,165
510
951
1.1
27.6
27.6
27.7
0.1
N
18,345
370
762
1.3
27.6
27.6
27.7
0.1
O
20,178
140
320
3.1
30.7
30.7
31.2
0.5
P
21,788
80
168
5.9
33.5
33.5
33.6
0.1
Q
22,588
60
323
3.1
37.4
37.4
37.6
0.2
R
24,088
60
341
2.6
41.0
41.0
41.0
0.0
S
25,653
140
675
1.3
41.9
41.9
42.8
0.9
T
26,653
110
248
3.6
42.6
42.6
43.6
1.0
U
27,628
190
490
1.8
47.8
47.8
48.1
0.3
V
29,078
140
333
2.7
50.7
50.7
51.1
0.4
W
30,048
98
149
5.2
57.3
57.3
57.6
0.3
1
3
2
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF BACKWATER EFFECTS FROM LONG ISLAND SOUND
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH LONG ISLAND SOUND
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF WAVE EFFECTS
NEW LONDON COUNTY, CT
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
TABLE 12
PATTAGANSETT RIVER
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
TABLE 11

A
31,500
120 / 70 2
801
7.1
11.4
11.4
11.4
0.0
B
32,840
120 / 60 2
862
6.6
13.5
13.5
13.6
0.1
C
34,250
159 / 100 2
1,113
5.1
14.9
14.9
15.5
0.6
 
D
35,670
120 / 82 2
892
6.4
16.0
16.0
16.9
0.9
E
37,060
495 / 85 2
2363
2.4
18.2
18.2
18.9
0.7
F
37,675
201 / 90 2
2054
2.8
22.2
22.2
22.3
0.1
G
41,274
109 / 49 2
1090
4.8
23.0
23.0
23.2
0.2
H
45,948
146 / 100 2
1475
3.5
25.0
25.0
25.2
0.2
I
51,898
111 / 60 2
1210
4.3
26.6
26.6
27.0
0.4
1
2
TABLE 12
PAWCATUCK RIVER
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
REGULATORY
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH LITTLE NARRAGANSETT BAY
WIDTH / WIDTH WITHIN NEW LONDON COUNTY
TABLE 11

A
2,205
35
62
7.7
10.8
9.4
9.4
0.0
B
3,266
190
982
0.5
23.3
23.3
24.3
1.0
C
3,716
21
84
5.7
23.3
23.3
24.3
1.0
 
D
4,276
146
754
0.6
23.3
23.3
24.3
1.0
E
4,506
139
978
0.5
28.1
28.1
29.1
1.0
F
4,791
205
1,503
0.3
28.1
28.1
29.1
1.0
G
5,276
235
1,329
0.4
28.1
28.1
29.1
1.0
H
5,666
71
411
1.2
28.1
28.1
29.1
1.0
1
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH THAMES RIVER
NEW LONDON COUNTY, CT
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
TABLE 12
PINE SWAMP BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
TABLE 11

A
1,645
*
5,960
3.7
50.0
50.0
50.0
0.0
B
2,010
*
3,194
7.0
50.0
50.0
50.0
0.0
C
2,765
*
2,967
7.5
50.0
50.0
50.0
0.0
 
D
3,545
*
6,725
3.3
50.6
50.6
50.6
0.0
E
6,120
*
4,413
5.0
50.8
50.8
50.9
0.1
F
7,270
*
2,272
9.8
50.8
50.8
50.9
0.1
G
8,480
*
2,015
11.0
54.5
54.5
54.6
0.1
H
9,390
*
3,130
7.1
58.3
58.3
58.4
0.1
I
12,760
*
2,890
7.7
63.7
63.7
64.1
0.4
J
14,730
*
3,083
7.2
67.2
67.2
67.5
0.3
K
16,310
*
3,139
7.1
70.0
70.0
70.3
0.3
L
18,745
*
3,120
7.1
74.1
74.1
74.3
0.2
M
20,395
372
5,191
4.3
76.0
76.0
76.3
0.3
N
21,795
273
3,968
5.4
76.7
76.7
77.2
0.5
O
23,465
322
3,848
5.6
78.2
78.2
78.7
0.5
P
25,580
239
4,055
5.3
79.8
79.8
80.5
0.7
Q
27,810
436
6,331
3.4
80.9
80.9
81.7
0.8
R
30,280
352
4,533
4.8
81.6
81.6
82.4
0.8
S
31,365
513
4,691
4.6
82.2
82.2
83.0
0.8
T
32,350
370
5,240
4.1
82.8
82.8
83.7
0.9
U
33,645
446
4,290
5.0
83.4
83.4
84.3
0.9
V
34,215
385
4,457
4.8
83.8
83.8
84.8
1.0
W
34,855
253
4,847
4.4
84.5
84.5
85.4
0.9
X
35,804
245
4,302
4.2
84.9
84.9
85.8
0.9
Y
36,090
200
3,400
5.3
85.5
85.5
86.3
0.8
Z
37,099
661
7,336
2.5
86.3
86.3
87.1
0.8
AA
38,874
217
3,454
5.2
87.2
87.2
88.0
0.8
1
*
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH SHETUCKET RIVER
FLOODWAY COINCIDENT WITH CHANNEL BANKS
NEW LONDON COUNTY, CT
(ALL JURISDICTIONS)
REGULATORY
WITH 
FLOODWAY
INCREASE
CROSS
SECTION
WITHOUT 
FLOODWAY
TABLE 12
QUINEBAUG RIVER
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
TABLE 11

AB
39,919
438
5,772
3.1
88.2
88.2
89.0
0.8
AC
40,105
490
7,301
2.5
98.8
98.8
98.8
0.0
AD
41,105
854
10,756
1.7
98.9
98.9
98.9
0.0
 
AE
44,925
681
9,887
1.8
99.1
99.1
99.1
0.0
AF
47,870
1,760
19,339
1.1
99.2
99.2
99.2
0.0
AG
50,235
529
7,468
2.4
99.2
99.2
99.2
0.0
1
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
CROSS
SECTION
DISTANCE1
WIDTH
(FEET)
SECTION
AREA
(SQUARE FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FLOODWAY DATA
FLOODING SOURCE
FLOODWAY
FEET ABOVE CONFLUENCE WITH SHETUCKET RIVER
QUINEBAUG RIVER
  FEDERAL EMERGENCY MANAGEMENT AGENCY
NEW LONDON COUNTY, CT
(ALL JURISDICTIONS)
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
TABLE 12
TABLE 11

A
16,000
193
2,967
15.2
14.4
-1.1 2
-0.1
1.0
B
16,422
115
3,834
11.8
14.4
2.0 2
2.4
0.4
C
16,739
229
3,659
12.3
14.4
2.6 2
3.0
0.4
 
D
17,162
256
3,120
14.5
14.4
3.4 2
3.8
0.4
E
18,059
372
6,484
7.0
14.4
8.7 2
8.8
0.1
F
18,587
302
4,167
10.8
14.4
9.1 2
9.2
0.1
G
19,590
435
6,250
7.2
14.4
12.5 2
12.5
0.0
H
20,224
316
6,075
7.4
14.4
13.4 2
13.4
0.0
I
20,963
512
7,581
5.9
14.8
14.8
14.9
0.1
J
21,702
423
6,046
7.5
15.7
15.7
15.8
0.1
K
22,442
433
6,787
6.6
17.6
17.6
17.8
0.2
L
23,339
342
6,557
6.9
18.9
18.9
19.1
0.2
M
24,870
262
6,112
8.4
22.0
22.0
22.8
0.8
N
26,190
428
8,860
5.1
24.3
24.3
25.2
0.9
O
26,824
560
8,231
5.5
30.8
30.8
30.8
0.0
P
28,725
435
7,809
5.8
32.4
32.4
32.7
0.3
Q
31,893
650
13,438
3.4
35.1
35.1
35.4
0.3
R
33,002
945
17,430
2.6
35.5
35.5
35.8
0.3
S
33,477
605
12,155
3.7
35.6
35.6
35.9
0.3
T
34,058
260
4,934
6.6
35.9
35.9
35.9
0.0
U
34,480
395
8,342
3.9
36.3
36.3
36.6
0.3
V
35,906
955
12,721
3.6
36.6
36.6
37.6
1.0
W
37,120
330
5,754
5.6
37.6
37.6
38.4
0.8
X
37,595
235
4,073
8.0
38.0
38.0
38.9
0.9
Y
37,912
240
4,499
7.2
38.7
38.7
39.5
0.8
Z
39,390
365
5,834
5.6
40.7
40.7
41.5
0.8
AA
39,707
550
9,075
3.6
41.1
41.1
42.0
0.9
1
2
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE ROUTE 2A
ELEVATIONS COMPUTED WITHOUT CONSIDERING BACKWATER EFFECTS FROM ATLANTIC OCEAN
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
TABLE 12
SHETUCKET RIVER
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
CROSS
SECTION
TABLE 11

AB
40,394
688
14,890
2.2
58.8
58.8
58.8
0.0
AC
42,083
745
12,043
2.7
59.0
59.0
59.0
0.0
AD
45,304
644
7,837
4.1
60.0
60.0
60.2
0.2
 
AE
45,885
319
5,494
5.9
60.6
60.6
60.7
0.1
AF
47,363
243
4,493
7.2
62.0
62.0
62.2
0.2
AG
48,683
262
4,167
7.8
63.7
63.7
64.3
0.6
AH
49,422
396
6,069
4.9
64.6
64.6
65.6
1.0
AI
49,792
478
8,585
3.5
65.2
65.2
66.1
0.9
AJ
51,376
900
11,586
2.6
74.6
74.6
74.6
0.0
AK
52,643
360
5,718
5.2
75.3
75.3
75.5
0.2
AL
53,699
745
9,368
3.2
76.4
76.4
77.4
1.0
AM
54,280
1,035
12,248
2.4
77.0
77.0
78.0
1.0
AN
55,442
740
8,772
3.4
78.4
78.4
79.4
1.0
AO
56,022
735
7,668
3.9
79.2
79.2
80.1
0.9
AP
56,392
945
9,866
4.0
79.8
79.8
80.7
0.9
AQ
58,504
434
5,686
5.2
80.4
80.4
81.3
0.9
AR
61,883
210
3,281
9.1
82.3
82.3
83.1
0.8
AS
63,045
240
3,751
7.9
84.2
84.2
85.0
0.8
1
REGULATORY
WITHOUT 
FLOODWAY
INCREASE
SECTION
AREA
(SQUARE FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE ROUTE 2A
WITH 
FLOODWAY
SHETUCKET RIVER
FLOODWAY DATA
FLOODING SOURCE
FLOODWAY
TABLE 12
  FEDERAL EMERGENCY MANAGEMENT AGENCY
NEW LONDON COUNTY, CT
(ALL JURISDICTIONS)
CROSS
SECTION
DISTANCE1
WIDTH
(FEET)
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
TABLE 11

A
10,800
54
318
4.1
111.6
111.6
112.5
0.9
B
11,160
300
1,336
1.0
111.9
111.9
112.8
0.9
C
11,700
38
197
6.6
111.9
111.9
112.8
0.9
 
D
11,810
80
578
2.2
115.8
115.8
116.8
1.0
E
12,160
154
1,242
1.0
115.9
115.9
116.9
1.0
F
12,520
277
1,892
0.7
115.9
115.9
116.9
1.0
1
TABLE 12
SHEWVILLE BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH HEWITT BROOK
TABLE 11

A
995
647
3,683
0.5
29.3
29.3
30.3
1.0
B
1,935
112
268
7.5
31.1
31.1
31.4
0.3
C
3,395
139
406
5.0
40.7
40.7
41.3
0.6
 
D
4,525
186
678
3.0
47.2
47.2
47.7
0.5
E
5,530
67
401
5.0
51.3
51.3
51.6
0.3
F
6,268
300
1,599
1.3
54.0
54.0
54.2
0.2
G
7,728
125
258
7.8
57.6
57.6
57.6
0.0
H
8,613
410
966
2.1
63.5
63.5
63.6
0.1
I
9,485
95
261
7.7
65.5
65.5
65.5
0.0
J
11,605
445
822
2.5
79.2
79.2
79.4
0.2
K
12,067
356
1,919
1.0
84.5
84.5
84.6
0.1
L
13,627
439
2,645
0.7
84.9
84.9
85.1
0.2
M
15,367
422
1,236
1.5
85.4
85.4
86.0
0.6
N
16,449
408
2,140
0.9
86.2
86.2
87.1
0.9
O
19,919
361
1,792
1.0
86.5
86.5
87.4
0.9
P
20,580
435
873
2.1
86.9
86.9
87.8
0.9
Q
21,635
85
207
8.9
93.0
93.0
94.0
1.0
R
22,725
85
449
4.1
103.3
103.3
104.3
1.0
S
23,817
250
1,427
1.3
114.3
114.3
114.3
0.0
T
24,717
45
168
11.0
121.8
121.8
121.9
0.1
U
24,893
55
508
3.6
130.0
130.0
130.6
0.6
V
25,720
251
1,103
1.1
134.9
134.9
135.8
0.9
W
30,390
43
249
4.7
138.2
138.2
138.7
0.5
1
TABLE 12
SHUNOCK RIVER
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
NEW LONDON COUNTY, CT
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH PAWCATUCK RIVER
TABLE 11

A
4,958
20
155
1.9
125.7
125.7
126.1
0.4
B
6,500
30
25
6.9
134.3
134.3
134.6
0.3
C
6,684
10
20
9.0
155.7
155.7
156.2
0.5
 
D
7,038
290
2,060
0.1
166.9
166.9
167.1
0.2
1
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
FEET ABOVE CONFLUENCE WITH SHETUCKET RIVER
NEW LONDON COUNTY, CT
REGULATORY
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
TABLE 12
SPAULDING POND BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
TABLE 11

A
*
*
*
*
9.8 2
*
*
*
B
*
*
*
*
9.8 2
*
*
*
C
*
*
*
*
9.8 2
*
*
*
 
D-K
*
*
*
*
*
*
*
*
*
2
1
FLOODWAY DATA
FLOODWAY
  FEDERAL EMERGENCY MANAGEMENT AGENCY
SECTION
AREA
(SQUARE FEET)
FLOODING SOURCE
DISTANCE1
FEET ABOVE CONFLUENCE WITH STONINGTON HARBOR
NEW LONDON COUNTY, CT
WITHOUT 
FLOODWAY
WITH 
FLOODWAY
INCREASE
TABLE 12
STONY BROOK
BASE FLOOD 
WATER SURFACE ELEVATION
(FEET NAVD 88)
REGULATORY
CROSS
SECTION
(ALL JURISDICTIONS)
WIDTH
(FEET)
MEAN
VELOCITY
(FEET PER SECOND)
DATA NOT AVAILABLE. CROSS SECTIONS ARE SHOWN ON FIRM FOR REFERENCE
ELEVATIONS COMPUTED WITHOUT CONSIDERATION OF WAVE EFFECTS
TABLE 11

A
2,075
400
1,525
1.4
118.6
118.6
119.4
0.8
B
2,595
58
220
9.9
119.0
119.0
119.4
0.4
C
2,700
60
465
4.7
123.6
123.6
123.9
0.3
 
D
2,875
80
775
2 8
125.1
125.1
125.4
0.3
E
3,485
100
624
3.5
125.2
125.2
125.6
0.4
F
4,272
100
356
6.1
125.5
125.5
126.5
1.0
G
4,388
60
250
8