MEAN LOW TIDE (MLT) to MEAN LOWER LOW WATER (MLLW)
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1 MEAN LOW TIDE (MLT) to MEAN LOWER LOW WATER (MLLW) WEDA GULF COAST CHAPTER ANNUAL CONFERENCE Christopher Frabotta Deputy Chief, Operations Division Galveston District Southwestern Division November 16, 2016 US Army Corps of Engineers
2 AGENDA Why the Transition to Mean Lower Low Water (MLLW)? What is Mean Low Tide (MLT)? What is Mean Lower Low Water (MLLW)? Partnership with Texas A&M University at Corpus Christi & TCOON. How does the conversion impact our navigation stakeholders? Implementation of conversion?
3 WHY CONVERT TO MEAN LOWER LOW WATER (MLLW)? Water Resources Development Act 1992 Water Resource & Reform Development Act 2014 Consistency Across Federal agencies: NOAA USCG USACE Internationally recognized vertical datum
4 AGENDA Why the Transition to Mean Lower Low Water (MLLW)? What is Mean Low Tide (MLT)? What is Mean Lower Low Water (MLLW)? Partnership with Texas A&M University at Corpus Christi & TCOON. How does the conversion impact our navigation stakeholders? Implementation of conversion?
5 MEAN LOW TIDE (MLT) Galveston District using Mean Low Tide (MLT) as vertical datum control for navigation projects MLT, in the context of District projects, is a legacy datum dating from the 1960 s and is geodetically tied to terrestrial benchmarks (NGVD 29, NAVD 88) At inception, MLT was empirically and subjectively derived and represented the lowest expected water level including both astronomical and meteorological forcing.
6 AGENDA Why the Transition to Mean Lower Low Water (MLLW)? What is Mean Low Tide (MLT)? What is Mean Lower Low Water (MLLW)? Partnership with Texas A&M University at Corpus Christi & TCOON. How does the conversion impact our navigation stakeholders? Implementation of conversion?
7 MEAN LOWER LOW WATER (MLLW) The arithmetic mean of the lower low water (MLLW) heights of the tide observed over a specific 19-year Metonic cycle (the NTDE). Only the lower low water of each pair of low waters of a tidal day is included in the mean. It is the depth (sounding) datum used on NOAA nautical charts; and internationally recognized. It is the average minimum tidal depth likely to be encountered by maritime operators.
8 AGENDA Why the Transition to Mean Lower Low Water (MLLW)? What is Mean Low Tide (MLT)? What is Mean Lower Low Water (MLLW)? Partnership with Texas A&M University at Corpus Christi & TCOON. How does the conversion impact our navigation stakeholders? Implementation of conversion?
9 GALVESTON DISTRICT TEXAS GENERAL LAND OFFICE CONRAD BLUCHER INSTITUTE FOR SURVEY & SCIENCE
10 DATA COLLECTION PLATFORMS
11 GALVESTON DISTRICT TEXAS GENERAL LAND OFFICE CONRAD BLUCHER INSTITUTE FOR SURVEY & SCIENCE
12 AGENDA Why the Transition to Mean Lower Low Water (MLLW)? What is Mean Low Tide (MLT)? What is Mean Lower Low Water (MLLW)? Partnership with Texas A&M University at Corpus Christi & TCOON. How does the conversion impact our navigation stakeholders? Implementation of conversion?
13 Policy on Vertical Datum Conversion Cost Share trigger at 50-ft in Channel Depth If a conversion to MLLW results in depths greater than 50 feet, the cost sharing will remain as documented in the executed Project Partnership Agreement which shall be included as an attachment to the EDR. This cost sharing shall remain in effect until such time as future authority is received to further alter the depth of the federal navigation channel. Round to nearest foot when there are non-integer variances between MLT & MLLW For project authorization purposes, the depth of conversion can be rounded to the nearest foot using standard rounding conventions ( goes to 50 and goes to 51).
14 GALVESTON DISTRICT TEXAS GENERAL LAND OFFICE CONRAD BLUCHER INSTITUTE FOR SURVEY & SCIENCE
15 MEAN LOW TIDE (MLT) TO MEAN LOWER LOW WATER (MLLW) 0 MLT
16 MEAN LOW TIDE (MLT) TO MEAN LOWER LOW WATER (MLLW) 0 MLT 45-ft
17 GALVESTON DISTRICT TEXAS GENERAL LAND OFFICE CONRAD BLUCHER INSTITUTE FOR SURVEY & SCIENCE
18 MEAN LOW TIDE (MLT) TO MEAN LOWER LOW WATER (MLLW) 0 MLLW 0 MLT 45-ft
19 MEAN LOW TIDE (MLT) TO MEAN LOWER LOW WATER (MLLW) 1-ft 0 MLLW 0 MLT 45-ft
20 MEAN LOW TIDE (MLT) TO MEAN LOWER LOW WATER (MLLW) 1-ft 0 MLLW 0 MLT 46-ft 45-ft
21 EXAMPLE #1 1-ft 0 MLLW 0 MLT Ideal Situation 46-ft 45-ft
22 GALVESTON DISTRICT TEXAS GENERAL LAND OFFICE CONRAD BLUCHER INSTITUTE FOR SURVEY & SCIENCE
23 EXAMPLE #2 1.8-ft 0 MLLW 0 MLT 45-ft
24 EXAMPLE #2 1.8-ft 0 MLLW 0 MLT 46.8-ft 45-ft
25 EXAMPLE #2 1.8-ft 0 MLLW 0 MLT 47.0-ft 45.2-ft
26 Tide Staff Installation
27 IMPLEMENTATION OF CONVERSION Phase 1: Reoccupy monuments associated with active/inactive gages & staffs COMPLETE Phase 2: Determine MLLW in selected coastal reaches COMPLETE Phase 3: Internal Data Analysis COMPLETE Phase 4: Internal / External communications Initiated on Feb 6, 2014; Channel-specific coordination; ONGOING Phase 5: Perform physical changes to project controls, including updating/establishing new tide staffs; ONGOING 27
28 GALVESTON DISTRICT NAVIGATION PROGRAM Sabine-Neches Waterway Chocolate Bayou Houston-Galveston-Texas Channel to Victoria Freeport Harbor Matagorda Ship Channel Texas Gulf System Corpus Christi Ship Channel annel Port Mansfield Channel to Harlingen Brazos Island Harbor
29 GALVESTON DISTRICT NAVIGATION PROGRAM Matagorda Ship Channel Texas Gulf (2 ft) System Corpus Christi Ship Channel (2 ft) Sabine-Neches Waterway (0-1 ft) Houston-Galveston-Texas (1 1.5 ft) Freeport Harbor (1 ft) Brazos Island Harbor (0 ft)
30 GALVESTON DISTRICT NAVIGATION PROGRAM Channel to Victoria (2 ft) Chocolate Bayou (1 ft) GIWW SABINE TO FREEPORT (1 ft) Texas Gulf System GIWW FREEPORT TO BANDERIA ISALND (2 ft) annel Port Mansfield (1 ft) Channel to Harlingen (1 ft) GIWW BANDERIA ISALND TO PORT ISABEL (1 ft)
31 MEAN LOW TIDE to MEAN LOWER LOW WATER Questions/Comments?
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