REQUIRED: A brief narrative summary of the data set.

Provide data for analyses of floods. Objectives of flood magnitude, frequency, inundation, duration, channel effects, hydrographs, and rainfall and runoff relationships. Map and tables of gaging and precipitation stations.

Water surface elevations of the base flood as approved by the Federal mergency management Agency (FEMA) for the Flood Insurance Rate Maps (FIRM). The base flood elevation, in feet, is in relation to the National Geodetic Vertical Datum of 1929. Profile baselines are for the Flood Insurance Rate Maps (FIRM). The cross section data are used for the production of Flood Insurance Rate Maps. The Flood Insurance Rate Maps (FIRMs) show different floodplains with different zone designations. These are primarily for insurance rating purposes, but the zone differentiation can be very helpful for other floodplain management purposes. The differentiated floodplain zones are used for the production of Flood Insurance Rate Maps. Maricopa County has been subdivided into FIRM panels for the publication and distribution of FIRMs. Profile baselines are for the Flood Insurance Rate Maps (FIRM).

Floodplain zones as approved by the Federal Emergency Management Agency (FEMA) for the Flood Insurance Rate Maps (FIRM). Differentiated according to the FEMA letter coding scheme.

Floodplain zones as computed by the Flood Control District of Maricopa County (FCDMC) according to the Federal Emergency Management Agency (FEMA) letter coding scheme, prior to approval by FEMA.

Documents from the Sylvia Fink mining collection.

Assessment of the character of flood hazards and the extent of flood-prone areas onthe piedmonts of Arizona is an increasingly important concern to floodplain managers asurban areas continue to expand. Piedmonts are the low-relief, gently sloping plainsbetween mountain ranges and the streams or playas that occupy the lowest portions of thevalleys. Proper management of flood hazards on piedmonts is important because much ofsouthern, central, and western Arizona is composed of piedmonts; they comprise most ofthe developable land around Phoenix and other rapidly expanding population centers of theState.Management of flood hazards in Arizona and elsewhere in the western UnitedStates is complicated because portions of many piedmonts are composed of active alluvialfans. During floods, these fans are subject to widespread inundation and local high velocityflow, and substantial changes in channel patterns may occur. Development thatproceeds on piedmonts without regard to the locations of active alluvial fans is likely toplace people and property at risk during large floods.Report and 4 map sheets.

Profile baselines as approved by the Federal Emergency Management Agency (FEMA) for the Flood Insurance Rate Maps (FIRM)

Cross sections as approved by the Federal Emergency management Agency (FEMA) for the Flood Insurance Rate Maps (FIRM)

Geomorphologic analyses and surficial geologic mapping provide information about the age and type of alluvial deposits on piedmonts that is critical in assessing the character of piedmont landforms and the nature and extent of piedmont flood hazards. Piedmonts in Maricopa County are covered by complex mosaics of surficial deposits with different physical characteristics related to the ages of the deposits. Surficial geologic maps differentiate alluvial deposits based on physical characteristics of the deposits (sediment size and character) and geomorphic surface characteristics associated with the deposits. Differences in the primary physical characteristics of surficial deposits result from differences in rock types in drainage basins, distance from uplands, and differences in the size and character of the stream system that transported the sediment. Surficial deposits are subsequently altered by processes of weathering, inputs of fine dust from the atmosphere, soil development, and local erosion, so the character of the surface and near-surface portion of the deposits is related to the length of time that the deposits have been exposed at the surface. Geologically young deposits on piedmonts record relatively recent activity of piedmont fluvial systems; laterally extensive young deposits are indicative of widespread flood inundation, shifts in flooding patterns, or both, in the past few thousand years. Thus, surficial geologic maps are very useful in defining the physical framework of active fluvial systems on piedmonts, and in particular are critical in evaluating the potential for alluvial fan flooding.

The Wintersburg 7 ' quadrangle is located 40 to 50 miles (70-80 km) west of downtown Phoenix. The maparea covers much of the piedmont between the Palo Verde Hills and the Hassayampa River and a 7 mile(11 km) reach of the Hassayampa River. The quadrangle includes a portion of the Palo Verde NuclearGenerating Station (PVNGS) and Interstate Highway 10. It has experienced some suburban developmentassociated with the PVNGS and is currently on the outer fringe of the greater Phoenix metropolitan area, somore development is likely in the near future. The small bedrock hills in the southwestern quarter of thequadrangle were mapped by Charles Ferguson in the spring of 2005. Surficial deposits that cover most ofthe quadrangle were mapped by Philip Pearthree using color aerial photos from 1979, high-resolution digitalcolor orthophotos provided by the Flood Control District of Maricopa County (FCDMC), and topographicinformation. Field checking was done in the spring, summer and fall of 2005. This mapping was done inconjunction with geologic mapping of the Flatiron Mountain 7 ' quadrangle (Spencer et al, 2005) to thenorth, and this quadrangle map is one of eight 1:24,000 scale geologic maps covering most of theHassayampa Valley that have been produced in 2004 - 2006. This mapping was completed under the jointState-Federal STATEMAP program, as specified in the National Geologic Mapping Act of 1992.

Information on the amount of water flowing in streams and rivers is critical to the management of water resources, emergency response to flooding, fisheries management, and many other uses. This layer provides access to near real-time stream gauge readings compiled from a variety of agencies and organizations.Dataset SummaryThe Live Stream Gauges layer contains near real-time measurements of water depth from multiple reporting agencies recording at sensors across the world. This layer updates every hour. Flow forecasts are provided where available. These sensor feeds are owned and maintained by the GIS community via the Community Maps Program. For details on the coverage in this map and to find out how to contribute your organization's gauges, please email environment@esri.com.Contributors to the Live Stream Gauges Service:United States Geological Survey (USA)National Weather Service (USA) * Includes Stage Status * Includes Flood Forecast Status *Washington State Department of Ecology (USA)San Joaquin County (USA)Maricopa County Flood Control District (USA)Minnesota Department of Natural Resources (USA)PEGELONLINE (Germany) * Includes Stage Status *Bureau of Meteorology (Australia)Horizons Regional Council (New Zealand) Environment Agency (UK)Nebraska Department of Natural Resources (USA) * Includes Stage Status *Iowa Flood Center (USA)Oregon Water Resource Department (USA)Dartmouth Flood Observatory (Global) * Includes Stage Status * Suspended *Meteorological Service of Canada (Canada)Volusia County Florida (USA) * Suspended *Somali Water and Land Information Management (Somalia) * Includes Stage Status *Office of Public Works (Ireland)RevisionsApr 15, 2025: Added fields for Flood Forecast Status for Full, 24 Hour, 48 Hour, and 72 Hour Forecast PeriodsFeb 13, 2024: Dartmouth Flood Observatory, suspended by government cutbacksDec 13, 2024: Added 'Status Classification' field, allowing symbol level draw order based on severity of flood status!Aug 26, 2024: Corrected update issue with USGS source data reported by several users.Aug 14, 2024: Updated USGS feed to pull from JSON data source, see: https://waterservices.usgs.gov/Jul 24, 2024: Added Office of Public Works (Ireland) dataJul 10, 2024: National Weather Service (NOAA) source reinstated after provider fix!Jul 8, 2024: Volusia County Florida, suspended during administrative holdJul 5, 2024: National Weather Service (NOAA) source stopped updating, suspended waiting on provider to correctMay 28, 2024: National Weather Service (NOAA) source updated, replaced retired AHPS with NWPSJan 22, 2024: Reinstated Somali Water and Land Management source after they successfully migrated to HTTPS ProtocolJan 3, 2024: Somali Water and Land Management source deactivated until Web Site issues are resolved!Mar 20, 2023: Nebraska DNR has been updated to leverage new source and now honors Stage Status!Feb 16, 2023: Nebraska DNR source update temporarily disabled due to source repository change!Aug 10, 2021: Added missing source for Nova Scotia CanadaJul 3, 2021: Added Somali Water and Land Information Management dataJun 30, 2021: Added Volusia County dataFeb 9, 2021: Refinements and Fixes:Corrections to Flow conversion for 'Environment Agency - UK'Corrections to Flow conversion for 'Horizons Regional Council - New Zealand'Added display of Metric Stage Height and Flow to PopupJan 27, 2021: Official release of Feature Service offering. Upgrades include:Automatic addition of new source stationsRemoval of stations with data older than 180 daysAddition of 'Governing Location' field that provides geographic State or Province (optional) plus Country NameAddition of 'Hours Since Last Update' field that maintains the age since gauge data was last updated

Information on the amount of water flowing in streams and rivers is critical to the management of water resources, emergency response to flooding, fisheries management, and many other uses. This layer provides access to near real-time stream gauge readings compiled from a variety of agencies and organizations.Dataset SummaryThe Live Stream Gauges layer contains near real-time measurements of water depth from multiple reporting agencies recording at sensors across the world. This layer updates every hour. Flow forecasts are provided where available. These sensor feeds are owned and maintained by the GIS community via the Community Maps Program. For details on the coverage in this map and to find out how to contribute your organization's gauges, please email environment@esri.com.Contributors to the Live Stream Gauges Service:United States Geological Survey (USA)National Weather Service (USA) * Includes Stage Status *Washington State Department of Ecology (USA)San Joaquin County (USA)Maricopa County Flood Control District (USA)Minnesota Department of Natural Resources (USA)PEGELONLINE (Germany) * Includes Stage Status *Bureau of Meteorology (Australia)Horizons Regional Council (New Zealand) Environment Agency (UK)Nebraska Department of Natural Resources (USA) * Includes Stage Status *Iowa Flood Center (USA)Oregon Water Resource Department (USA)Dartmouth Flood Observatory (Global) * Includes Stage Status *Meteorological Service of Canada (Canada)Volusia County Florida (USA) * Suspended *Somali Water and Land Information Management (Somalia) * Includes Stage Status *Office of Public Works (Ireland)RevisionsDec 13, 2024: Added 'Status Classification' field, allowing symbol level draw order based on severity of flood status!Aug 26, 2024: Corrected update issue with USGS source data reported by several users.Aug 14, 2024: Updated USGS feed to pull from JSON data source, see: https://waterservices.usgs.gov/Jul 24, 2024: Added Office of Public Works (Ireland) dataJul 10, 2024: National Weather Service (NOAA) source reinstated after provider fix!Jul 8, 2024: Volusia County Florida, suspended during administrative holdJul 5, 2024: National Weather Service (NOAA) source stopped updating, suspended waiting on provider to correctMay 28, 2024: National Weather Service (NOAA) source updated, replaced retired AHPS with NWPSJan 22, 2024: Reinstated Somali Water and Land Management source after they successfully migrated to HTTPS ProtocolJan 3, 2024: Somali Water and Land Management source deactivated until Web Site issues are resolved!Mar 20, 2023: Nebraska DNR has been updated to leverage new source and now honors Stage Status!Feb 16, 2023: Nebraska DNR source update temporarily disabled due to source repository change!Aug 10, 2021: Added missing source for Nova Scotia CanadaJul 3, 2021: Added Somali Water and Land Information Management dataJun 30, 2021: Added Volusia County dataFeb 9, 2021: Refinements and Fixes:Corrections to Flow conversion for 'Environment Agency - UK'Corrections to Flow conversion for 'Horizons Regional Council - New Zealand'Added display of Metric Stage Height and Flow to PopupJan 27, 2021: Official release of Feature Service offering. Upgrades include:Automatic addition of new source stationsRemoval of stations with data older than 180 daysAddition of 'Governing Location' field that provides geographic State or Province (optional) plus Country NameAddition of 'Hours Since Last Update' field that maintains the age since gauge data was last updated