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Case Study: Fort McHenry Wetlands Restoration Project
where I represents an individual month & N is the total number of months
Calculation of MTL Datum (meters) for Subordinate A (Marsh Restoration) corrected by the Control B station’s accepted Datum
A (m) B (m) A – B (m)
May 04 1.539 1.542
Jun 04 1.575 1.569
Jul 04 1.618 1.628
Sum
Total Months (N)
Mean
Accepted for B 1.4921.492
Corrected for A
Case Study: Fort McHenry Wetlands Restoration Project
where I represents an individual month & N is the total number of months
Calculation of DTL Datum (meters) for Subordinate A (Marsh Restoration) corrected by the Control B station’s accepted Datum
A (m) B (m) A – B (m)May 04 1.558 1.559Jun 04 1.595 1.587Jul 04 1.642 1.651
SumTotal Months (N)
Mean
Accepted for B 1.5041.504
Corrected for A
Case Study: Fort McHenry Wetlands Restoration Project
where I represents an individual month & N is the total number of months
Calculation of Mn Datum (meters) for Subordinate A (Marsh Restoration) corrected by the Control B station’s accepted Datum
A (m) B (m) A / B (m)
May 04 0.355 0.358
Jun 04 0.355 0.357
Jul 04 0.364 0.369
Sum
Total Months (N)
Mean
Accepted for B 0.3480.348
Corrected for A
Case Study: Fort McHenry Wetlands Restoration Project
where I represents an individual month & N is the total number of months
Calculation of Gt Datum (meters) for Subordinate A (Marsh Restoration) corrected by the Control B station’s accepted Datum
A (m) B (m) A / B (m)
May 04 0.500 0.502
Jun 04 0.503 0.504
Jul 04 0.508 0.502
Sum
Total Months (N)
Mean
Accepted for B 0.5060.506
Corrected for A
Case Study: Fort McHenry Wetlands Restoration Project
Tidal Datums (meters) by the Modified-Range Ratio Method (MRRM) for Subordinate (A) at Marsh Restoration corrected by long-term Control (B)
at Baltimore
1. MLWA = MTL - (0.5 x Mn) = ____ - (0.5 x ____) = ____ m____ m
1. MHWA = MLW + Mn = ____ + ____ = ____ m____ m
3. MLLWA = DTL - (0.5 x Gt) = ____ - (0.5 x ____) = ____ m____ m
4. MHHWA = MLLW + Gt = ____ + ____ = ____ m____ m
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