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High Water Mark Ordinary Tide (HWMOT) = Marc penllanw -----Original Message----- From: Discussion of Welsh language technical terminology and vocabulary [mailto:[log in to unmask]] On Behalf Of David Bullock Sent: 16 September 2003 15:52 To: [log in to unmask] Subject: Re: lowest astronomical tide level (LAT) Un gwahaniaeth yw bod y marc penllanw a'r marc distyll yn llawer llai manwl o ran eu diffiniad na'r HAT a'r LAT. Y cyfan yw'r marc penllanw - hyd y gwela i, a roiodd y gorau i ddaearydiaeth yn Fform 3 - yw'r llinell o wymon a sbwriel y gallwch ei gweld ar hyd y traeth ar ōl i'r tonnau gilio. Mae hynny'n llawer mwy cyffredinol, anwyddonol a bras na'r hyn sydd dan sylw gan awdur y dyfyniad sydd gan Siān. Beth fyddai o'i le pe baech chi'n dweud 'distyll astronomegol isaf' a 'llanw astronomegol uchaf'? ----- Original Message ----- From: "Howard Mitchell" <[log in to unmask]> To: "David Bullock" <[log in to unmask]> Sent: Tuesday, September 16, 2003 2:52 PM Subject: Re: lowest astronomical tide level (LAT) Marc penllanw; marc distyll? Beth ydy'r gwahaniaeth? -----Original Message----- From: Discussion of Welsh language technical terminology and vocabulary [mailto:[log in to unmask]] On Behalf Of Sian Roberts Sent: 16 September 2003 12:10 To: [log in to unmask] Subject: lowest astronomical tide level (LAT) A all rhywun helpu? Dyma ddiffiniad: HAT - Highest astronomical tide LAT - Lowest astronomical tide Highest astronomical tide (HAT) is the highest level, and Lowest astronomical tide (LAT) the lowest level that can be expected to occur under average meteorological conditions and under any combination of astronomical conditions. HAT and LAT are not extreme levels, as certai meteorological conditions can cause a higher or lower level, respectively. Diolch Siān