ATTACHMENT B_1845225 8c_Bathymetry survey data Mar2025_mllw.pdf
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- NSN, Q-47 DEMOLISH FISHING PIER
- Solicitation number
- N4008526R0108
About this file
This document is a bathymetric condition survey map for the Naval Station Norfolk Small Boat Channels and Lag Area in Norfolk, Virginia, dated March 2025. The survey was conducted by NAVFAC Mid-Atlantic Region, CI Core Hydrographic Branch, with data prepared by JRB Design Inc. The map displays detailed depth information relative to NOAA Mean Lower Low Water (MLLW) across multiple survey areas.
The survey covers the NSN Small Boat Channel and Willoughby Bay, with depth contours color-coded to show conditions ranging from less than 5.00 feet to greater than 11.00 feet. The survey notes indicate that depth boundaries shown represent Mean High Water and refer to NOAA Mean Lower Low Water salinity data. Multiple survey notes detail the hydrographic survey methodology, including horizontal datum references using WGS-84 coordinates, dredge limit delineation, and cell statistics for average depth calculations. The map includes standard nautical features such as existing channel day markers, degaussing stations, fishing piers, and dredge limit boundaries (typical). Scale is 1 inch = 120 feet, with north orientation clearly marked.
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Text version
75'
14BA
BA
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
09+
8+
7+
6+
5+
4+
3+
2+
1+
0+
EXISTING
R2
G3
R4
G5
R6
FISHING PIER
Q-AREA
DREDGE LIMITS (TYP)
DREDGE LIMITS (TYP)
DREDGE LIMITS (TYP)
DREDGE LIMITS (TYP)
E
LI
M
IT
S T/
S (T
YP
Q5
Q57 Q60
STATION
DEGAUSSING
No. Date Revision BY
MID-ATLANTIC REGION - CI CORE
HYDROGRAPHIC BRANCH
NORFOLK, VIRGINIA
NAVFAC DRAWING NO:
Lead Surveyor:
Processed By:
Drawn By:
Checked By:
MAXIMO:
JOB ORDER NO:
WORK ORDER NO:
NAVAL STATION NORFOLK SMALL BOAT CHANNEL AND LAG AREA - NORFOLK, VA
SCALE: 1" = 120' SHEET 1 OF 2
M. Williams, R Butler
B. O'Malley
BATHYMETRIC CONDITION SURVEY - MARCH 2025
MAY 2, 2025
SURVEY NOTES:
1. DEPTH SOUNDINGS SHOWN HEREIN ARE IN FEET AND REFER TO THE NOAA MEAN LOWER LOW WATER (MLLW) DATUM.
2. THE HYDROGRAPHIC SURVEY WAS CONDUCTED USING CLASS 1 HYDROGRAPHIC SURVEY METHODS & ACCURACIES OUTLINED IN THE CORPS OF ENGINEERS' HYDROGRAPHIC SURVEYING MANUAL (EM 1110-2-1003).
3. ALL SOUNDINGS WERE RECORDED USING A RESON T50P AND/OR T20P MULTI-BEAM SONAR SYSTEM WITH HORIZONTAL POSITIONS
OBTAINED VIA APPLANIX POS/MV GPS W/MRU.
4. HORIZONTAL DATUM: VIRGINIA STATE PLANE COORDINATE SYSTEM, ZONE 4502, U.S. SURVEY FEET (NAD83).
5. MULTIBEAM SURVEY DATA DEPICTED AND/OR USED FOR CALCULATING VOLUMES IS REPRESENTATIVE OF A LARGER DATA SET
AND HAS BEEN PROCESSED USING HYPACK/HYSWEEP SOFTWARE AS FOLLOWS:
SOUNDING DATA FOR DISPLAY:
CELL SIZE: 30' X 30', SOUNDING POSITION: CENTER OF CELL, CELL STATISTICS: AVERAGE DEPTH.
SOUNDING DATA FOR VOLUME CALCULATIONS:
CELL SIZE: 5' X 5', SOUNDING POSITION: CENTER OF CELL, CELL STATISTICS: AVERAGE DEPTH.
6. SURVEY DATE(S) MARCH 3-4, 2025.
DEPTHS SHOWN
ARE RELATIVE
TO NOAA MLLW
NSN SMALL BOAT CHANNEL
North
< 5.00
5.00 - 5.99
6.00 - 6.99
7.00 - 7.99
8.00 - 8.99
9.00 - 9.99
10.00 - 10.99
>= 11.00
200 400 600 800100 Scale: 1 Inch = 120.00 Feet
Feet
05 10
Flood
Ebb
+4
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
+0
E
EXISTING CHANNEL DAY MARKER (T
YPICAL)
LA
G 27
DREDGE LIM
ITS T/S (T
YP)
DREDGE LIM
ITS T/S (T
YP)
SB
C
DREDGE LIMITS (TYP)
DREDGE LIMITS (TYP)
DREDGE LIMITS (TYP)
LA
G
BOAT R
AMP
SAILI
NG C
ENTE
R
ADMIR
AL H
UGHES D
RIV
E
WIL
ADMIRAL HUGHES DRIVE
G5
R6
R8
G7
G9
PIE
R I
PIE
R C
PIE
R D
PIE
R E
PIE
R K
PIE
R J
DREDGE LIMITS (TYP)
DREDGE LI
MITS
T/ S (T
YP)
PIE
R F
PIE
R G
PIE
R H
MARIN
A
No. Date Revision BY
MID-ATLANTIC REGION - CI CORE
HYDROGRAPHIC BRANCH
NORFOLK, VIRGINIA
NAVFAC DRAWING NO:
Lead Surveyor:
Processed By:
Drawn By:
Checked By:
MAXIMO:
JOB ORDER NO:
WORK ORDER NO:
NAVAL STATION NORFOLK SMALL BOAT CHANNEL AND LAG AREA - NORFOLK, VA
SCALE: 1" = 120' SHEET 2 OF 2
M. Williams. R. Butler
B. O'Malley
BATHYMETRIC CONDITION SURVEY - MARCH 2025
MAY 2, 2025
SURVEY NOTES:
1. DEPTH SOUNDINGS SHOWN HEREIN ARE IN FEET AND REFER TO THE NOAA MEAN LOWER LOW WATER (MLLW) DATUM.
2. THE HYDROGRAPHIC SURVEY WAS CONDUCTED USING CLASS 1 HYDROGRAPHIC SURVEY METHODS & ACCURACIES OUTLINED IN THE CORPS OF ENGINEERS' HYDROGRAPHIC SURVEYING MANUAL (EM 1110-2-1003).
3. ALL SOUNDINGS WERE RECORDED USING A RESON T50P AND/OR T20P MULTI-BEAM SONAR SYSTEM WITH HORIZONTAL POSITIONS
OBTAINED VIA APPLANIX POS/MV GPS W/MRU.
4. HORIZONTAL DATUM: VIRGINIA STATE PLANE COORDINATE SYSTEM, ZONE 4502, U.S. SURVEY FEET (NAD83).
5. MULTIBEAM SURVEY DATA DEPICTED AND/OR USED FOR CALCULATING VOLUMES IS REPRESENTATIVE OF A LARGER DATA SET
AND HAS BEEN PROCESSED USING HYPACK/HYSWEEP SOFTWARE AS FOLLOWS:
SOUNDING DATA FOR DISPLAY:
CELL SIZE: 30' X 30', SOUNDING POSITION: CENTER OF CELL, CELL STATISTICS: AVERAGE DEPTH.
SOUNDING DATA FOR VOLUME CALCULATIONS:
CELL SIZE: 5' X 5', SOUNDING POSITION: CENTER OF CELL, CELL STATISTICS: AVERAGE DEPTH.
6. SURVEY DATE(S) MARCH 3-4, 2025.
DEPTHS SHOWN
ARE RELATIVE
TO NOAA MLLW
LAG AREA
NSN SMALL BOAT CHANNEL
WILLOUGHBY BAY
North
< 5.00
5.00 - 5.99
6.00 - 6.99
7.00 - 7.99
8.00 - 8.99
9.00 - 9.99
10.00 - 10.99
>= 11.00
200 400 600 800100 Scale: 1 Inch = 120.00 Feet
Feet
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