100-Year FEMA Effective and Preliminary Floodplain Maps
These maps are designed to assist in determining if a particular piece of property is located in a 100-year floodplain as designated by the Federal Emergency Management Agency (FEMA). The map, however, is not an official document that may be used for floodplain determination.
The Flood Control District provides official floodplain determinations. To obtain an official determination, please print and fill out a Flood Insurance Rate Maps Information form and fax it to (602) 372-6232. Once you have sent in your request, the District will complete the form with the floodplain zone and map information and fax it back to you. There is no fee for the official floodplain determination service.
NOTE: Some cities and towns perform their own floodplain management. A list of those cities and towns is found in the Floodplain Management section of this Web site.
Elevation Certificates
An elevation certificate may be viewed and printed by double-clicking on each blue triangle on the map. Each triangle represents the location of an elevation certificate that has been issued for a particular structure.
Rio Verde Area Drainage Master Plan 2-Dimensional Modeling Map
This map is intended for use by experienced engineers as a design aid for preparing site drainage and grading plans, and for establishing building lowest floor elevations for new structures. Users are strongly encouraged to consult with District staff prior to applying this information for the first time to obtain a clear understanding of the basis for the information and for guidance in its application. The map, however, is not an official document that may be used for floodplain determination.
This map is designed to assist in obtaining the results of hydrologic and hydraulic modeling for a portion of the Rio Verde Area Drainage Master Plan (ADMP). A 25.1-square-mile portion of the 40-square-mile ADMP study area was analyzed using a grid-based 2-dimensional computer model. Information is available for each 25-foot by 25-foot square grid for the entire 25.1-square-mile detailed study area. The information available is an estimate of the 100-year 24-hour storm peak discharge in cubic feet per second, the dominate direction of that discharge, and the resulting peak water surface elevation on the NAVD 1988 vertical datum. The results are the average for each grid element. The preliminary floodplain boundaries also shown on the map are based on this data.
Historical Aerial Photography
Historical aerial photography is available for some areas of the County for the following years: 1930, 1937, 1949, 1959, 1962, 1964, 1969, 1979, 1986, 1990, 1991, fiscal year (FY) 1992-1993, FY 1996-1997, FY 1997-1998, FY 1998-1999, FY 1999-2000, FY 2000-2001, FY 2001-2002, FY 2002-2003, FY 2003-2004, FY 2004-2005, FY 2005-2006, FY 2006-2007, and FY 2007-2008. To find a photo to view and purchase, select the year of interest and a grid will show areas where photo images are available.
10-Foot Countywide Elevation Contour and Digital Terrain Model (DTM) Data
The 10-foot elevation contours and spot elevations cover most of the County. The data are from 2001 with a positional accuracy of approximately +/- 5 feet. The DTM data, based on 15,000-foot x 15,000-foot tiles, may be purchased in Arc/Info Generate, AutoCAD DWG and Microstation In-Roads formats.
Geodetic Densification and Cadastral Survey (GDACS) Data
These maps have GDACS data produced by the Maricopa County Department of Transportation (MCDOT), and display National Geodetic Survey (NGS), Continuously Operating Reference Station (CORS) and Continuously Operating Base Station (COBS).
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