NSW tidal limits

Export DataAccess APIMetadata Portal Metadata InformationContent TitleNSW tidal limitsContent TypeHosted Feature LayerDescriptionThe tidal limits information was collected in NSW estuaries between August 1996 and August 2005 as part of the NSW Department of Natural Resources' Estuary Management Programs to better manage the coastal zone of NSW.For the purpose of this survey a definition of tidal limit had to be adopted and so it was decided that the limit of tidal influence would be the point along the estuary at which the water level no longer responded to the ocean tide. Put simply, the most upstream point at which the ocean tidal influence would ultimately penetrate if there was no (or negligible) freshwater flow in the system. After a flood event in a major river it may take one or two months before the freshwater inflow reduced to that of the previous baseflow conditions. In smaller creek systems, after a flood event it may only take one or two weeks for the restoration of the tidal limit.Initial Publication Date06/07/2022Data Currency10/11/2023Data Update FrequencyOtherContent SourceFile TypeCSV (*.csv)AttributionData Theme, Classification or Relationship to other DatasetsAccuracyBased on ground truthing. The field trips were planned to coincide with predicted ocean tides higher than 1.8m ISLW calculated from data recorded at the tide gauge maintained by MHL located at Middle Head in Sydney Harbour. This meant that although a survey may not have been done on the highest predicted tides (approximately 2.00m ISLW) the difference would be generally not more than 20cm. The actual difference would be less than this by the time the ocean tide had travelled to the extremities of the estuary. So the threshold of 1.80m was selected as a compromise between needing to survey the highest tides and having a useful number of tides to work with on any one field trip.Spatial Reference System (dataset)WGS84Spatial Reference System (web service)EPSG:4326WGS84 Equivalent ToGDA94Spatial ExtentContent LineageData ClassificationUnclassifiedData Access PolicyOpenData QualityTerms and ConditionsCreative CommonsStandard and SpecificationData CustodianNSW GovernmentPoint of Contactdata-request@mhl.nsw.gov.auData AggregatorData DistributorAdditional Supporting InformationTRIM Number