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This table includes water body counts with the index and the 500-Year floodplain. |
| summary:
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This table includes water body counts with the index and the 500-Year floodplain. |
| accessInformation:
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This data was generated by AtkinsRéalis, using the National Hydrography Dataset Plus. |
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| maxScale:
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5000 |
| typeKeywords:
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[] |
| description:
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>FFRA_Grid</SPAN><SPAN STYLE="font-size:12pt">: This is a foreign key that relates to the Unique_ID field in the FFRA_Grid table. </SPAN></P><P><SPAN STYLE="font-size:12pt">NHDWaterBody_Total: Represents the total number of waterbodies intersecting the pixel. The influence of the waterbody may artificially raise the hazard index.</SPAN></P></DIV></DIV></DIV> |
| licenseInfo:
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<DIV STYLE="text-align:Left;"><P STYLE="font-size:16ptmargin:0 0 11 0;"><SPAN>The FFRA is provided for the 30-county area at a spatial resolution of 1-kilometer by 1-kilometer for better computational efficiency as well as to align with input data with the coarsest resolution among those that were used in this study. In addition, the selection of the 1-kilometer by 1-kilometer pixel grid for processing FFRA can avoid confusion about the intent of the product – a finer resolution may give a false impression about the precision or intent of this study. This study is not intended to site sirens as part of outdoor warning siren systems but to identify flash flood-prone areas that warrant sirens. FFRA with a resolution of 1x1 kilometer can adequately serve as foundational information for identifying flash flood-prone areas that warrant sirens given the audible radius for outdoor warning sirens typically ranging from approximately 1 to 2 miles.</SPAN></P></DIV> |
| catalogPath:
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| title:
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NHD_Water |
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| url:
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| tags:
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["NHD waterbodies"] |
| culture:
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en-US |
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| guid:
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| minScale:
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150000000 |
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