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Description: Moreton Bay Regional Floodplain DatabaseOverland Flow FloodingVersion 1.11.0 (October 2016)This theme shows runoff which exceeds the capacity of the underground drainage system (if present) and which concentrates in surface depressions, yards and gullies, and roadways as it flows down a catchment. Overland flow is generally caused by short and intense bursts of rainfall (typically less than 1 hour in duration). Overland flow can cause flooding that generally lasts only for a limited period of time and will usually dissipate shortly after the rainfall has stopped.Methodology'Rainfall on grid' approach applied using a hydraulic model (TUFLOW) and a nested rainfall burst. Model does not include underground structures however rainfall was scaled down to account for the possibility of some run-off being contained within the underground system. A post-process was applied to eliminate areas of shallow depth, low velocity and low velocity depth product.Existing Conditions FIG ScenarioModelled estimate of the extent of overland flow paths following a 1% Annual Exceedance Probability storm outside the river and creek flood extent and with some model errors and small property intersects removed. In addition a 1m internal buffer was applied and objects less than 40m2 removed.PurposeTo determine flood extent along overland flowpaths in areas outside the extent of the river and creek flood modelling. Intended to be used by the Flood Information Geoprocessor. Not suitable for public dissemination.MethodologyRainfall on grid' approach applied using a hydraulic model (TUFLOW) and a nested rainfall burst. Model does not include underground structures however rainfall was scaled down to account for the possibility of some run-off being contained within the underground system. A post-process was applied to eliminate areas of shallow depth, low velocity and low velocity depth product. Additional removal of model errors, small and 1m internal buffer then removal of objects less than 40m2.Flood Model MetadataDescribes the lineage of the computer-based flood models used to derive the data.This dataset contains vector polygons defining areas of consistent flood model metadata for the respective theme, scenario and probability.Modelled ProbabilityThe probability of flooding represented by this dataset is:1% Chance of Flooding in Any One YearLikelihood: PossibleAnnual Exceedance Probability (AEP): 1%Average Recurrence Interval (ARI): 100 YearA large uncommon flood event that is rarely observed but neverthess still possible. Over a long period of time an event of similar size may occur on average once every 100 years. It is therefore likely an event of this size will occur at least once during a single lifetime. It is less likely, but still possible, for a flood of this size to occur more than once in a single lifetime. A flood event of similar size occurred in the middle and upper reaches of the Caboolture River during January 2011.Version Notes1.11.0 - Sub set of F01 (Public) Version 1.10.0 with 1m buffer to prevent selection by FIG of properties with touch relationship. (October 2016)Version Resolution: 1.0mData Reliability: DIndicates that Council can only provide an extent but not levels as the flood data is of limited reliabilityFurther InformationFor additional information on flooding in the Moreton Bay Region please see Council's website: http://www.moretonbay.qld.gov.au/floodcheck/

Copyright Text: Moreton Bay Regional Council, 2015

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Last Edit Date: 1/17/2022 10:16:44 PM

Schema Last Edit Date: 1/17/2022 10:16:44 PM

Data Last Edit Date: 1/17/2022 10:16:44 PM

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