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1.0
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1
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0.000
Projected
GCS_North_American_1983_HARN
Linear Unit: Foot_US (0.304801)
NAD_1983_HARN_StatePlane_Illinois_East_FIPS_1201_Feet
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The topographic wetness index shows areas with increased accumulated runoff potential, and areas with low slope and large upslope contributing areas.
DuPage County Illinois TWI
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The TWI is a physically based index or indicator of the effect of local topography on runoff flow direction and accumulation. The index is a function of both the slope and the upstream contributing area. The computation of TWI is performed using both geographic information systems (GIS) and Python, a programing software used to enhance computing capabilities. The indices help identify rainfall runoff patterns, areas of potential increased soil moisture, and ponding areas. Illinois State Water Survey generated the index to the Illinois counties of DuPage and Will (see report at </SPAN><A href="http://hdl.handle.net/2142/98495"><SPAN><SPAN>http://hdl.handle.net/2142/98495</SPAN></SPAN></A><SPAN>), but has subsequently generated the index for most Illinois counties as high resolution DEMs derived from LiDAR have become available. The DEM used for this county was derived from LiDAR acquired in 201</SPAN><SPAN>4</SPAN><SPAN>. While TWI is usually viewed in raster format, ISWS is distributing a version in polygon format for easier access and use. Because TWI was computed using a bare earth DEM, TWI polygons mistakenly overlapped building footprints. These areas were subsequently removed during post processing using building footprints obtained from DuPage County Information Technology Department, GIS Division.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
Illinois State Water Survey
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The Illinois State Water Survey and/or The University of Illinois gives no warranty, express or implied, as to the accuracy, reliability, utility or completeness of this information. The user assumes all responsibility and risk</SPAN><SPAN>.</SPAN></P></DIV></DIV></DIV>
Esri ArcGIS 13.1.3.41833
DuPage_TWI
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20230830