Scientific Investigations Report 2006–5101–D
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5101–D
Table A3. Watershed variables used in data analysis.
[See table A1 for data sources. Abbreviations: m, meter, km2, square kilometer; cm, centimeter]
| Description | Variable code | Definition |
|---|---|---|
| Urban intensity index | UII | See text of this report for defintion and full description |
| Percent impervious surface | NLCD_IS | NLCD 2001 mean percentage of impervious surface within watershed area (based on 30 m resolution data) |
| POPDEN00 | POPDEN00 | 2000 population density (people per square mile) (2000 census block based) |
| Percent urban + agriculture | P_NLCD1_2+8 | Aggregated P_NLCD 2001 level 1 category: developed (percentage of watershed) + herbaceous planted/cultivated (percentage of watershed) |
| ROADDEN | ROADDEN | Road density in watershed = (RDLENGTH [kilometers] divided by watershed area [km2]) |
| Mean watershed elevation | MEANELEV | Mean watershed elevation (m) |
| Minimum watershed elevation | MIN_ELEV | Minimum watershed elevation (m) |
| Mean soil erodibility | KFCAVE | Mean soil erodibiity factor (K factor) including rock fragments (unitless) |
| Percent flat and low elevation land in basin | PFLATLOW | Percentage of watershed area that is flat (slope less than 1 percent) and low (elevation less than midpoint) |
| Annual precipitation | MAP | Mean annual precipitation (based on 18 years of data) (cm) |
| Mean percent watershed slope | SLOPE_X | Mean watershed slope (percent) |
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2006/5101-D
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