reference_to_MLLW = 0
reference_to_MLW  = 0.024
reference_to_MSL  = 0.416
reference_to_MTL  = 0.414
reference_to_DTL  = 0.437
reference_to_MHW  = 0.804
reference_to_MHHW = 0.874
reference_tide_datum_time_period = 'May 1990 - April 1998'
reference_tide_datum_epoch = '1983-2001'