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The 30-Year Chance Risk Grid represents the probability of flooding at least one time during a 30-year period for the areas within the extent of the of the most severe flood event (e.g. 0.2% annual chance or 500 year floodplain). This dataset utilizes the values within the Percent Annual Chance (PAC) Risk grid to determine the percent risk over a period of time. |
| summary:
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The 30-Year Chance Risk Grid represents the probability of flooding at least one time during a 30-year period for the areas within the extent of the of the most severe flood event (e.g. 0.2% annual chance or 500 year floodplain). This dataset utilizes the values within the Percent Annual Chance (PAC) Risk grid to determine the percent risk over a period of time. |
| accessInformation:
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The San Antonio River Authority (“River Authority”) provides access to information pertaining to the San Antonio River Basin and adjacent counties (“DATA”). This service allowing access to the DATA is offered subject to your unconditional acceptance of these terms. You are required to use the Site and DATA in a lawful manner. Data is provided “as is” and on an “as-available” basis. River Authority makes no warranty, representation, or guaranty of any kind including without limitation to the content, fitness for a particular purpose, sequence, accuracy, timeliness, or completeness of the DATA. River Authority assumes no liability for any errors, omissions, lack of timeliness, or inaccuracies in the DATA regardless how caused. River Authority assumes no liability for any advice, report, or decision made or not made by any person or entity in reliance upon the DATA. Once the DATA is downloaded, River Authority cannot verify the quality, accuracy, and/or timeliness of any analysis conducted or report using DATA. Users of DATA should cite the date that DATA was accessed or retrieved and clearly state that “This uses River Authority’s data but is not endorsed or verified by River Authority.” You agree to hold harmless River Authority its contractors, employees, agents, Board, and the like from and against any and all claims and expenses arising out of your use of the DATA. Accessing and using the DATA constitutes unconditional acceptance of both these Terms and of all risks associated with the use of the DATA. All rights are reserved to the owners of the respective rights.<o:p></o:p> |
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35346.8777919461 |
| typeKeywords:
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["Data","Service","Image Service","ArcGIS Server"] |
| description:
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The 30-Year Chance Risk Grid represents the probability of flooding at least one time during a 30-year period for the areas within the extent of the of the most severe flood event (e.g. 0.2% annual chance or 500 year floodplain). This dataset utilizes the values within the Percent Annual Chance (PAC) Risk grid to determine the percent risk over a period of time.</SPAN></P><P><SPAN>Probability = 1 – (1-p)^n</SPAN></P><P><SPAN>p = percent annual chance of flooding at each location sampled within the 0.2% annual chance floodplain (values can be derived from the Percent Annual Chance raster layer).</SPAN></P><P><SPAN>n = time period in years</SPAN></P><P><SPAN>For more information, please review the technical and guidance documentation provided by FEMA (link).</SPAN></P><P><SPAN>Please contact the San Antonio River Authority’s (SARA) Watershed Engineering Department for more information regarding their FEMA Risk MAP projects.</SPAN></P><P><SPAN>Source data: O:\SARAData\Projects\RiskMAP\in_azure\RiskMap_Publishing_PROD\RiskMap_Publishing_PROD.gdb</SPAN></P><P><SPAN>Published Nov 2023 to the gisLibrary for public use on ArcGIS Online</SPAN></P></DIV></DIV></DIV> |
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| catalogPath:
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| title:
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FEMA_RiskMAP_Pct30yrChance |
| type:
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Image Service |
| url:
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https://gisimaging.sara-tx.org/arcgis/admin |
| tags:
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["FEMA","RiskMAP","Percent 30 year Chance"] |
| culture:
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en-US |
| name:
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FEMA_RiskMAP_Pct30yrChance |
| guid:
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| minScale:
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1131100.08934228 |
| spatialReference:
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NAD_1983_StatePlane_Texas_South_Central_FIPS_4204_Feet |