Datum Conversions - Yorktown (YKTV2) 
Flood Level MLLW MHHW NAVD88
Zero MLLW 0.00 -2.58 -1.49
Action 4.00 1.42 2.51
Minor 4.50 1.92 3.01
Moderate 5.00 2.42 3.51
Major 5.50 2.92 4.01