Results of a Study into the Use of a Phase 2 Sampling Grid as a Monitoring Strategy for the Mawddach Estuary. (1999 CCW Marine Monitoring trials) dataset https://portal.medin.org.uk/portal/start.php?tpc=007_NRW_DS111146 The aim of this survey was to investigate the feasibility of using a phase 2 sampling grid methodology to determine the proportion of muddy and sandy communities and the distribution of major communities within the estuary. The Mawddach is one of the best examples of a small, drying, bar-built estuary in Britain and, with its mountainous catchment area it has some of the lowest nutrient inputs in Wales. In order to be able to report on the condition of the estuary a number of attributes have been identified which require monitoring. This dataset contains the results of a survey carried out to trial a sampling strategy and methodology that addresses two of these attributes: - The relative proportion of muddy and sandy communities. - The distribution of major communities within the estuary. 20010430