Bathymetry and Debris Map-Port Allen SBH Bathymetry and Debris Map.pdf

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Attached to
Port Allen Small Boat Hrbr. Hurricane Lowell Demo Debris Removal
Solicitation number
B27000606
Issued by
Hawaii

About this file

Written by GovTribe AI ·

Summary

This is a Bathymetry and Debris Map for Port Allen Small Boat Harbor (SBH) in Eleele, Hawaii, prepared following Hurricane Lowell damage assessment. The map documents the results of a hydrographic survey conducted on September 18, 2026, using advanced multi-beam sonar and positioning equipment to identify seafloor conditions, debris, and structural damage within the harbor. The survey identified multiple debris items including a partially submerged sailboat, probable sunken piers, possible displaced debris, possible displaced armor stones, and documented breakwater damage. The map utilizes Mean Lower Low Water (MLLW) as the vertical datum and Hawaiian State Plane Zone 4 coordinates, with contours generated from a 1x1 foot grid at 1.0-foot intervals and color bathymetric imagery from 0.5x0.5 foot grid cells. The survey was performed to U.S. Army Corps of Engineers Hydrographic Surveying Manual standards (EM-1110-2-1003).

The debris removal requirements specified on the map mandate removal and disposal of all labeled debris, probable sunken piers, and the partially submerged sailboat. All unlabeled debris found at depths of 10 feet or shallower must be removed, while debris at depths exceeding 10 feet shall remain in place unless directed otherwise by contract documents. Displaced armor stones located at 10 feet depth or shallower must be relocated to the nearest toe of the breakwater structure. This debris removal is part of the larger Hurricane Lowell recovery effort at Port Allen Small Boat Harbor, which requires contractors to furnish all materials, tools, equipment, and labor necessary for demolition and removal of in-water and shoreline-adjacent debris, damaged infrastructure, vessels, and miscellaneous debris caused by the hurricane.

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CLIENT:

SCALE:

SHEET SIZE:

REVISION DATE

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PROJECT NUMBER:

Partially Submerged Sailboat

Probable Sunken Pier

Probable Sunken Pier

Possible Debris

Possible Debris

Possible Debris

Possible Debris

Possible Debris

Possible Debris

Possible Debris

Breakwater Damage Area

Possible Debris

Possible Displaced Armor Stones

NOTES:

1. Vertical Datum: Mean Lower Low Water (MLLW) Feet

2. Coordinate system: HI State Plane Zone 4 US Feet

3. Vertical Control:

3.a. Desciption: NGS Benchmark Tidal 1347B 3.b. Elevation 10.8 ft

4. Horizontal Control:

4.a. Description: NGS Benchmark Tidal 1347B 4.b. Easting: 1,610,551.32 US feet 4.c. Northing: 24,207.17 US feet

5. Hydrographic Survey Dates: 09-18-2026

6. Survey Equipment:

6.a. Sonar: R2 Sonic 2020 6.b. Heading:Septentrio dual-antenna GNSS receiver for RTK and PPP 6.c. Position: Septentrio dual-antenna GNSS receiver for RTK and PPP 6.d. Position: Leica GS16/GS18/CS20 GNSS RTK GPS System 6.e. Motion: SBG Ekinox-E Navsight inertial navigation system (INS) 6.f. SVP: AML Micro SV sound velocity probe on sonar; AML SV profiler for manual cast 6.g. Lidar: Velodyne VLP-16 Puck 6.h. Software: Hypack 2023

7. Contours generated from 1x1 ft grid averaged elevation. The contour interval is 1.0 ft.

8. Color bathymetric imagery generated from 0.5x 0.5 ft grid average cells

9. Data represent seafloor elevation at the time of survey.

Seafloor elevation may change at any time following the time of the survey.

10. Elevations may vary between sounding locations.

11. Survey performed to standards of the U.S. Army Corps of Engineers

Hydrographic Surveying Manual EM-1110-2-1003.

12. Labeled debris estimates from sonar imagery and should be confirmed visually.

Feet 0 100 200

Breakwater Damage Area

AutoCAD SHX Text 1"=30'

AutoCAD SHX Text

DOBAR

AutoCAD SHX Text 34" x22"

AutoCAD SHX Text

OCT 15, 2026

AutoCAD SHX Text

504 N NIMITZ HWY HONOLULU, HI96817 808.259.7966 WWW.SEAENGINEERING.COM

AutoCAD SHX Text 250156

Finn McCall Text Box

NOTES:

1. REMOVE AND DISPOSE ALL DEBRIS/OBJECTS IDENTIFIED AS 'POSSIBLE DEBRIS', 'PROBABLE SUNKEN PIER', AND 'PARTIALLY SUBMERGED SAILBOAT'.

2. REMOVAE ALL DEBRIS THAT IS NOT LABELED OR IDENTIFIED FOUND AT A DEPTH OF 10' AND SHALLOWER.

3. DEBRIS LOCATED AT 10' DEPTH OR DEEPER SHALL REMAIN IN PLACE UNLESS DIRECTED OTHERWISE OR SHOWN ON OTHER DOCUMENTS IN THE SOLICITATION.

4. 'POSSIBLE DISPLACED ARMOR STONES' LOCATED AT 10' DEPTH OR SHALLOWER SHALL BE MOVED TO THE NEAREST TOE OF THE BREAKWATER STRUCTURE.

Sheets and Views
Port Allen SBH Bathymetry w Labeled

File details come from the government source that posted it. Updated .