Refer to the Data Acquisition and Processing Report (DAPR) for a complete description of data acquisition and processing systems, survey vessels, quality control procedures and data processing methods. Additional information to supplement sounding and survey data, and any deviations from the DAPR are discussed in the following sections.ApplanixPositioning and Attitude SystemPOS MV 320 v5Kongsberg MaritimeMBESEM 2040Sea-Bird ScientificConductivity, Temperature, and Depth SensorSBE 19plus V2Teledyne RESONSound Speed SystemSVP 70Kongsberg MaritimeMBESEM 710AML OceanographicConductivity, Temperature, and Depth SensorMicro-CTDODIM Brooke OceanSound Speed SystemMVP200SupportFiles\IMG_1838.jpgNOAA Ship RAINIER (S221) with survey launches 2801 (RA-4), 2802 (RA-5), and 2803 (RA-3) in June 201928018.81.128038.81.1S22170.44.5All sounding systems were calibrated as detailed in the DAPR.All data reduction procedures conform to those detailed in the DAPR.NOAA Profile Version 2019 2.0Submitted surfaces were generated using the recommended parameters for depth-based (Ranges) Caris variable-resolution bathymetric grids as specified in the 2019 HSSD. Three critical soundings were created for this survey; one was identified as a Danger to Navigation. Additional information about DTONS is included in section D.1 Chart Comparison.NOAA_VR2.6239.1Complete MBESCARIS VR Surface (CUBE)H13273_MB_VR_MLLWVariable ResolutionNOAA_VR2.2239.1Complete MBESCARIS VR Surface (CUBE)H13273_MB_VR_MLLW_FinalVariable ResolutionSupportFiles\Backscatter_Mosaic.pngAcoustic backscatter mosaic for H13273 All equipment and survey methods were used as detailed in the DAPR.FliersPydro QC Tools "Detect Fliers" was used with default settings to find fliers in a finalized VR surface. Obvious noise was rejected by the hydrographer in Caris Subset Editor. After data cleaning, Detect Fliers was run again and found 4 certain fliers; these were investigated and found to be false positives. Two of these four fliers are located on the nearshore boundary of coverage where the seafloor rises sharply. The two others are located on the edges of a charted rock where the seafloor slopes up steeply as well. The results of the Detect Fliers tool are included as a .000 files in the Separates section of this report.All equipment and survey methods were used as detailed in the DAPR.Sonar system quality control checks were conducted as detailed in the quality control section of the DAPR.Excessive BiofoulingSupportFiles\H13271_dirty_boat.jpgRAINIER launch EM 2040 transducer with biofouling in the process of being cleaned.Due to the warm water temperatures of the survey area and the extended period of time that RAINIER launches remained in the water with no antifouling hull coating, the sonar transducers and the SVP 70 surface sound velocity probe suffered from a significant amount of biofouling during the project. An increase in the noise of the data can not be directly attributed to the fouled sonars, but should be noted as a possible contributing factor to observed noise in the data.SupportFiles\SoundSpeedLocs.pngSound speed cast locations for H13273, with all 53 casts depicted by black crosshairsFifty three sound speed profiles were acquired for this survey at discrete locations within the survey area at least once every four hours for launches and once per hour for RAINIER, as well as when significant changes in surface sound speed were observed, or when operating in a new area. Sound speed profiles were obtained using Sea-Bird 19plus SEACAT Profilers for launch-acquired data, and ODIM Brooke Ocean MVP 200 for ship-acquired data. All casts were concatenated into a master file and applied to MBES data using the "Nearest distance within time" (4 hours) profile selection method.SupportFiles\H13273_MB_VR_MLLW_Final.QAv5.tvu_qc.pngH13273 Uncertainty shown as a fraction of allowable uncertaintyS221N/A0.05N/A12801, 2803N/A0.053N/AERS via ERTDM120Total Propagated Uncertainty (TPU) values for survey H13273 were derived from a combination of fixed values for equipment and vessel characteristics, as well as from field assigned values for sound speed uncertainties. Tidal uncertainty was provided in the project instructions for the NOAA vertical datum transformation model used for this survey. In addition to the usual a priori estimates of uncertainty, some real-time and post-processed uncertainty sources were also incorporated into the depth estimates of this survey. Real-time uncertainties for position, navigation, attitude, and vessel motion data from Applanix POS MV were applied during acquisition and initially in postprocessing. However, the SBET and RMS files, which were generated using POSPac MMS software and applied in CARIS HIPS to supersede POS MV data, have post-processed uncertainties associated with the GPS height and position. Uncertainty values of the submitted finalized grid was calculated in Caris using "Greater of the Two" of uncertainty and standard deviation (scaled to 95%). Grid QA v5 within Pydro QC Tools was used to analyze H13273 TVU compliance. H13273 met HSSD requirements in over 99.5 percent of grid nodes, which is shown in the histogram plot below.Significant Sea StateData acquired in the nearshore areas of H13273 were acquired by RAINIER launches 2801 and 2803, while offshore data were acquired by RAINIER. The offshore portion was generally delineated by a half-mile buffer off of the charted shoreline. Due to the propensity of the area to experiencing strong trade winds, sea states on a typical survey day ranged from 4-6 feet. This resulted in excessive noise and "blowouts" in the data throughout the nearshore launch-acquired areas. Data that were obvious noise or found to be causing fliers in the surface were rejected by the hydrographer.SupportFiles\Junction.pngOverview of survey junction between H13271 and H13273.SupportFiles\H13273_MB_VR_MLLW_Final-H13271_MB_VR_MLLW_Final_fracAllowErr_Freq.pngPydro derived plot showing allowable error between H13271 and H13273.SupportFiles\H13273_MB_VR_MLLW_Final-H13271_MB_VR_MLLW_Final_depth_delta.pngPydro derived plot showing H13271 and H13273 comparison statistics.NOAA Ship RAINIER2019S5000H13271The junction with survey H13271 encompassed approximately 0.72 square nautical miles along the southern boundary of H13273. Pydro's Compare Grids results showed that 99.5+% of nodes in the common area met NOAA allowable error standards. Analysis of the difference surface indicated that H13273 is an average of 0.03 meters deeper than H13271 with a standard deviation of 0.15 meters. See figures 10-12 for more information.H13273 junctions with one contemporary survey conducted by NOAA Ship RAINIER. Comparisons were made using the Compare Grids program within Pydro Explorer.SupportFiles\XLOverview.pngH13273 crossline surface overlaid on mainscheme tracklines.SupportFiles\H13273_MB_VR_MLLW_MSOnly-H13273_MB_VR_MLLW_XL_depth_delta.pngPydro derived plot showing absolute difference statistics of H13273 mainscheme to crossline data.SupportFiles\H13273_MB_VR_MLLW_MSOnly-H13273_MB_VR_MLLW_XL_fracAllowErr_Freq.pngPydro derived plot showing percentage-pass value of H13273 mainscheme to crossline data.RAINIER (S221), and survey launch 2803 (RA-3) acquired 25.44 nautical miles of multibeam crosslines. H13273 crossline data is adequate for verifying and evaluating the internal consistency of survey data. The Compare Grids function in Pydro Explorer analyzed finalized VR surfaces of H13273 mainscheme survey data and crossline survey data. In the difference surface, 99.5% of nodes met HSSD allowable Total Vertical Uncertainty (TVU) standards. See Figures 6-8 for specific details on the crossline analysis.2019-09-202019-07-232019Multibeam Echo SounderMultibeam Echo Sounder Backscatter2019-06-28UTC -10Pacific Hydrographic BranchAny revisions to the Descriptive Report (DR) applied during office processing are shown in red italic text. The DR is maintained as a field unit product, therefore all information and recommendations within this report are considered preliminary unless otherwise noted. The final disposition of survey data is represented in the NOAA nautical chart products. All pertinent records for this survey are archived at the National Centers for Environmental Information (NCEI) and can be retrieved via https://www.ncei.noaa.gov/. Products created during office processing were generated in NAD83 UTM 4N, MLLW. All references to other horizontal or vertical datums in this report are applicable to the processed hydrographic data provided by the field unit.Benjamin K. Evans CAPT/NOAAmetersNavigable AreaNOAAHawaii10000H132733United StatesApproaches to Kahului BayNOAA Ship Rainier (S221)Hawaiian Islands and VicinityHawaiian Islands and VicinityOPR-T383-RA-19Complete multibeam echosounder (MBES) coverage was acquired to the inshore limit of hydrography. The inshore limit for this project was defined in the Project Instructions as 10 meters water depth due to the high surf and swell conditions of the area. Areas where survey coverage did not meet the assigned sheet limits or 10 meter inshore limit were due to the survey vessel reaching the Navigable Area Limit Line (NALL) as defined as the limit of safe navigation. Consistently high wind and surf conditions pushed the limit of safe navigation outside of the 10 meter contour in some locations along the western boundary of coverage.00050.5202019-07-232019-07-302019-07-312019-08-052019-08-062019-08-072019-08-082019-09-172019-09-182019-09-192019-09-202801000064.9200002803000048.9506.0300S2210000253.41019.41000000367.2906.925.4400SupportFiles\Coverage Area.pngH13273 Assigned survey area (black) and acquired survey coverage.The survey area is referred to as H13273, "Approaches to Kahului Bay" (sheet 3) in the Project Instructions. The survey area encompasses 50.52 square nautical miles.21.0281666667156.55716666720.931156.339333333SupportFiles\WHolidayfinal.pngHoliday flagged by Pydro QC Tools Holiday Finder on the western boundary of H13273 SupportFiles\NorthHolidaySnag.png Gap in northern portion of H13273 coverage caused by sonar misconfiguration. Ultimately fell just shy of being classified as a holiday. Subset of sounding data with overlaid surface can be seen in upper right inset.Pydro QC Tools was used to identify one holiday with the "Holiday Finder" tool, which was found to be caused by acoustic shadowing in the outer beams of coverage. This holiday can be seen in figure 3 below, and the results of the Holiday Finder tool are included in the separates section of this report. An additional area in the northern area of the survey was not a holiday by complete coverage standards, but did result in a noticiable gap in the gridded surface. This gap was caused by a temporary misconfiguration of the maximum depth setting on the sonar during acquisition. This resulted in a loss of the nadir beams and ultimately a noticeable gap in the surface in approximately 200 meters of water. This area can be seen in figure 4 below.Complete Coverage (Refer to HSSD Section 5.2.2.3)All waters in survey area.The entire survey is adequate to supersede previous data.SupportFiles\H13273_MB_VR_MLLW_Final.QAv5.density.pngPydro derived plot showing HSSD density compliance of H13273 finalized variable resolution MBES data.Pydro QC Tools was used to analyze H13273 multibeam echosounder (MBES) data density. The submitted H13273 variable-resolution (VR) surface met HSSD density requirements as shown in the histogram below.This project area, encompassing 225 square nautical miles, is heavily trafficked by container ships, tankers, barges, commercial and recreational fishing vessels, and tourism industry vessels. Kahului Harbor is home to a Carnival and Norwegian Cruise Line terminal, and is the only deep draft commercial harbor on the island of Maui. Despite the volume of maritime traffic, the vast majority of bathymetric data in the project area were acquired prior to 1984. This survey will provide contemporary data to update National Ocean Service (NOS) nautical charting products. Additionally, survey data from this project will support the Seabed 2030 global mapping initiative.US5HA22M300002019-09-27172017-08-02SupportFiles\NewDelete_Rock.pngLocation of previously charted rock and location shown in survey data. One previously charted UWTROC located approximately 600 meters offshore was found 25 meters from its charted position. The previously charted rock is attributed for deletion and a new rock is attributed in the location shown by the survey data in the final feature file. SupportFiles\DTON_Rock.png5.5 meter (3 fathom) sounding submitted as DTON. ENC has since been updated to reflect submitted DTON.SupportFiles\NewRockDeep.png13.3 meter uncharted shoal outside of charted 18.2 meter/10 fathom contour, not included in final feature file. Soundings in meters.One Danger to Navigation (DTON) was submitted with this survey. A 5.47 meter (~3 fathom) sounding was found in survey data in a position between the 9.1 and 18.2 meter (5 and 10 fathom) charted depth curves, approximately 200 meters offshore. The ENC has since been updated to reflect this DTON, as shown in figure 20, and it is included in the final feature file. Correspondence reflecting the submission of this DTON can be found in the separates section included with this report. Additionally, a previously uncharted 13.3 meter shoal was discovered adjacent to a charted 23.7 meter ENC sounding. The shoal can be seen in figure 21, and is represented in the finalized surface, not in the final feature file.SupportFiles\SWPARE.pngSWPARE area features from ENC US5HA22M, overlaid on H13273 coverage (brown), and RNC 19342. The swept area features are also represented on the RNC by the green tint in the center of the survey area.No charted features attributed as "P.A." (Position Reported), "E.D." (Existence Doubtful), "P.D." (Position Doubtful), or "Rep" (Reported, with year) exist for this survey. The ENC does contain three SWPARE area features that were swept in 1936-1937 for previously undetected dangers to navigation. These areas have been addressed with complete coverage multibeam data and the hydrographer recommends their removal from the chart. These areas can be seen in figure 19.A comparison was made between H13273 survey data and Electronic Navigation Chart (ENC) US5HA22M using CUBE finalized VR surfaces, selected soundings and contours created in Caris HIPS.No channels exist for this survey. There are no designated anchorages, precautionary areas, safety fairways, traffic separation schemes, pilot boarding areas, or channel and range lines within the survey limits.No present or planned construction or dredging exist within the survey limits.No abnormal seafloor and/or environmental conditions exist for this survey.No submarine features exist for this survey.No overhead features exist for this survey.No bottom samples were required for this survey.No new surveys or further investigations are recommended for this area.No platforms exist for this survey.The Pacific Islands Ocean Observing System (PacIOOS) Wave Buoy 187: Pauwela, Maui. The buoy, a privately maintained lighted environmental buoy, was not observed during nighttime or daytime survey operations. PacIOOS data reports the buoy as being removed during the survey dates, and it is therefore attributed for retention in the final feature file.No Maritime Boundary Points were assigned for this survey.No ferry routes or terminals exist for this survey.No new insets are recommended for this area.Chief of Party2020-01-17Samuel F. Greenaway CDR/NOAAField Operations Officer2020-01-17Hadley Owen LT/NOAAChief Survey Technician2020-01-17James B. JacobsonSheet Manager2020-01-17Nick Azzopardi LTJG/NOAAThe survey data meets or exceeds requirements as set forth in the NOS Hydrographic Surveys Specifications and Deliverables, Field Procedures Manual, Letter Instructions, and all HSD Technical Directives. These data are adequate to supersede charted data in their common areas. This survey is complete and no additional work is required with the exception of deficiencies noted in the Descriptive Report.As Chief of Party, field operations for this hydrographic survey were conducted under my direct supervision, with frequent personal checks of progress and adequacy. I have reviewed the attached survey data and reports.All field sheets, this Descriptive Report, and all accompanying records and data are approved. All records are forwarded for final review and processing to the Processing Branch.Additional information discussing the vertical or horizontal control for this survey can be found in the DAPR.The Wide Area Augmentation System (WAAS) was used for real-time horizontal control during data acquisition.North American Datum 1983RTXProjected UTM 4ERS via ERTDMOPR-T383-RA-19_ERTDM_NAD83(2011)_MLLW_ext.csarOPR-T383-RA-19_ERTDM_NAD83(2011)_MHW_ext.csarMean Lower Low Water