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This table includes the inputs informing the Hazard Index using the pre-normalized values. |
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This table includes the inputs informing the Hazard Index using the pre-normalized values. |
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This data was generated by WERC, using the United States Geological Survey (USGS) LiDAR 30-meter Digital Elevation Model (DEM), USGS National Land Cover Dataset (NLCD) Land Use / Land Cover (LULC), National Oceanic and Atmospheric Administration (NOAA) Atlas 14 100-year, 24-hour Gridded Precipitation Dataset, and the United States Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS) Gridded Soil Survey Geographic (gSSURGO) database. |
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5000 |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN STYLE="text-decoration:underline;">FFRA_Grid</SPAN><SPAN>: This is a foreign key that relates to the Unique_ID field in the FFRA_Grid table. </SPAN></P><P><SPAN STYLE="text-decoration:underline;">Distance_to_Drainage_preNorm</SPAN><SPAN>: Represents proximity to streams or rivers.</SPAN></P><P><SPAN STYLE="text-decoration:underline;">Slope_Radians_preNorm</SPAN><SPAN>: Controls runoff velocity and flow direction and a strong predictor of flash flood intensity in steep basins.</SPAN></P><P><SPAN STYLE="text-decoration:underline;">Flashiness_preNorm</SPAN><SPAN>: Represents the flashy nature of landscape.</SPAN></P><P><SPAN STYLE="text-decoration:underline;">Hand_preNorm</SPAN><SPAN>: Represents local hydraulic position relative to drainage network.</SPAN></P><P><SPAN STYLE="text-decoration:underline;">Drainage_Density_preNorm</SPAN><SPAN>: Represents the local concentration of stream channels per unit area.</SPAN></P><P><SPAN STYLE="text-decoration:underline;">Rainfall_preNorm</SPAN><SPAN>: Represents 100-yr, 24-hr precipitation depths.</SPAN></P><P><SPAN STYLE="text-decoration:underline;">Flow Accumulation_preNorm</SPAN><SPAN>: Identifies concentrated flow paths and potential channel initiation zones.</SPAN></P><P><SPAN STYLE="text-decoration:underline;">Plan Curvature_preNorm</SPAN><SPAN>:</SPAN><SPAN STYLE="font-size:8pt"> </SPAN><SPAN>Represents flow convergence and divergence zones by computing curvature perpendicular to slope direction.</SPAN></P><P><SPAN STYLE="text-decoration:underline;">TWI_preNorm</SPAN><SPAN>: Identifies runoff concentration/saturation zones.</SPAN></P><P><SPAN STYLE="text-decoration:underline;">Curve_Number_preNorm</SPAN><SPAN>: Represents spatial runoff potential.</SPAN></P><P><SPAN STYLE="text-decoration:underline;">TPI_preNorm</SPAN><SPAN>: Distinguishes ridge/valley and channel confinement and helps locate flash-flood routing corridors.</SPAN></P><P><SPAN STYLE="text-decoration:underline;">Profile Curvature_preNorm</SPAN><SPAN>: Controls flow acceleration, erosion, and deposition potential by computing curvature along direction of maximum slope.</SPAN></P><P><SPAN STYLE="text-decoration:underline;">SPI_preNorm</SPAN><SPAN>: Indicates erosive energy and peak flow hazard.</SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>While the hazard dataset has comprehensive coverage for the 30-county area, the product is tailored specifically to target flash flood-prone areas along rivers, streams, channels, or other waterways that warrant sirens (and may not fully capture localized or pluvial flooding mechanisms).</SPAN></P><P><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></DIV></DIV> |
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Hazard_Inputs_PreNorm |
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["Curve Number","Distance to Drainage","Drainage Density","Exposure","FFRA","Flashiness","Flow Accumulation","Hazard","Height Above Nearest Drainage (HAND)","Plan Curvature","Profile Curvature","Rainfall","Slope","Stream Power Index (SPI)","Topographic Position Index (TPI)","Topographic Wetness Index (TWI)"] |
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en-US |
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150000000 |
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