Access APIMetadata Portal Metadata InformationContent TitleLGA Authority Reference MapContent TypeWeb MapDescriptionAuthority Reference Map for LGAs in NSW.Initial Publication Date16/10/2024Data Currency06/11/2024Data Update FrequencyOtherContent SourceOtherFile TypeMap Feature ServiceAttributionData Theme, Classification or Relationship to other DatasetsAccuracySpatial Reference System (dataset)GDA94Spatial Reference System (web service)EPSG:4326WGS84 Equivalent ToGDA94Spatial ExtentContent LineageData ClassificationUnclassifiedData Access PolicyOpenData QualityTerms and ConditionsCreative CommonsStandard and SpecificationData CustodianCEMS | DCS Spatial ServicesPoint of ContactCEMS | DCS Spatial ServicesData AggregatorDCS Spatial ServicesData DistributorDCS Spatial ServicesAdditional Supporting InformationData Sources: https://portal.spatial.nsw.gov.au/server/rest/services/NSW_Land_Parcel_Property_Theme_multiCRS/FeatureServer/11TRIM Number

Homeland Infrastructure Foundation-Level Data (HIFLD) geospatial data sets containing information on National Flood Hazard Layer (NFHL).

Export DataAccess APIMetadata Portal Metadata InformationContent TitleSES Warning Polygons Emergency 20250311Content TypeHosted Feature LayerDescriptionSES Warning Polygons Emergency Initial Publication Date11/03/2025Data Currency11/03/2025Data Update FrequencyOtherContent SourceData provider filesFile TypeESRI File Geodatabase (*.gdb)AttributionData Theme, Classification or Relationship to other DatasetsAccuracySpatial Reference System (dataset)GDA94Spatial Reference System (web service)EPSG:3857WGS84 Equivalent ToGDA94Spatial ExtentContent LineageData ClassificationUnclassifiedData Access PolicyOpenData QualityTerms and ConditionsCreative CommonsStandard and SpecificationData CustodianSESPoint of ContactSESData AggregatorData DistributorAdditional Supporting InformationTRIM Number

Wildfire can substantially alter the hydrologic response of watersheds to rainfall, and debris-flow activity is the among the most destructive consequences of these events. To assist federal, state, and local agencies in planning for postfire hazards, the U.S. Geological Survey conducts debris-flow hazard assessments for recent wildfires.This item holds the postfire debris-flow hazard assessment for the Gwen fire event that began on or near 2024-07-24. Contents: Shapefiles.zip Zip archive of hazard modeling results. Includes shapefiles for the fire perimeter, stream segments, catchment basins, and outlet points. gwn2024-field-descriptions.txt Descriptions of the shapefile data fields. gwn2024-median-thresholds.csv Table of median rainfall thresholds as calculated over the stream segments and catchment basins. gwn2024-metadata.txt Auxiliary metadata about the fire event and implementation of the hazard assessment. Methods: The hazard assessment was designed to implement: * The "M1" debris-flow likelihood model of Staley and others (2017) * The "emergency" potential sediment volume model of Gartner and others (2014) * The debris-flow combined hazard classification scheme of Cannon and others (2010) The assessment was produced by USGS personnel running the beta version of the ocelote package. Operational personnel may have also modified stream network delineation and modeling parameters in order to ensure quality. The beta version is represented by the ocelote commits prior to the v1.0.0 release. The ocelote source repository can be found here: https://code.usgs.gov/ghsc/lhp/ocelote References: Cannon, S. H., Gartner, J. E., Rupert, M. G., Michael, J. A., Rea, A. H., and Parrett, C. (2010). Predicting the probability and volume of postwildfire debris flows in the intermountain western United States. Bulletin, 122(1-2), 127-144. Gartner, J. E., Cannon, S. H., and Santi, P. M. (2014). Empirical models for predicting volumes of sediment deposited by debris flows and sediment-laden floods in the transverse ranges of southern California. Engineering Geology, 176, 45-56. Staley, D. M., Negri, J. A., Kean, J. W., Laber, J. L., Tillery, A. C., and Youberg, A. M. (2017). Prediction of spatially explicit rainfall intensity–duration thresholds for post-fire debris-flow generation in the western United States. Geomorphology, 278, 149-162.