Southern
California Metric Maps HUCs - 10 digit U_INDEX Human Land Use RHUM0 Stream Corridor RHUM30 30 Meter RHUM90 90 Meter N_INDEX Natural Land Use RNAT0 Stream Corridor RNAT30 30 Meter RNAT90 90 Meter PBAR Barren RBAR0 Stream Corridor RBAR30 30 Meter RBAR90 90 Meter PAGT Agriculture RAGT0 Stream Corridor RAGT30 30 Meter RAGT90 90 Meter PAGC Cropland RAGC0 Stream Corridor RAGC30 30 Meter RAGC90 90 Meter PAGP Pasture RAGP0 Stream Corridor RAGP30 30 Meter RAGP90 90 Meter PURB Urban RURB0 Stream Corridor RURB30 30 Meter RURB90 90 Meter PWETL Wetland RWETL0 Stream Corridor RWETL30 30 Meter RWETL90 90 Meter PFOR Forest RFOR0 Stream Corridor RFOR30 30 Meter RFOR90 90 Meter AGCSL3 - Steep Slopes STRMLEN Stream Length STRMDENS Stream Density RDLEN Road Length RDLENCINTE Interstates RDLENCHIGH Highways RDLENCROAD Surface Road RDDENS Road Density RDDENSCINT Interstates RDDENSCHIG Highways RDDENSCROA Surface Road FNUMBER Forest Patches FPATDENS Forest Density FLARGEST Largest Forest FAVGSIZE Average Forest PLGP Proportion of Forest FEDGE210 Forest Edge FCORE210 Forest Interior FEA210 Forest Edge/Total PFF9 Forest Cell PFPTCH9 Watershed/Patch Forest PFTRAN9 Watershed/Transitional PFEDGE9 Watershed/Edge Forest PFPERF9 Watershed/Perforated PFINTR9 Watershed/Interior REGFAC_COUNT Regulated Facilities MINES_COUNT Mines COWDENS Cow Grazing Intensity POPDENS Population Density |
RAGC90 - Percentage of stream length within 90 meters of cropland The percentage of cropland cover within 90 meters of a stream is
calculated by summing the total number of cropland land cover cells
underneath stream segments in the 1 km grid cell reporting unit
and within a three cell buffer (90 meters) and dividing by the stream
corridor’s total land area (all cells 90 meters adjacent to
streams minus those classified as water). Cells inside the buffer
zone but outside of the grid cell boundary are ignored. Agricultural
practices typically employ fertilizers, pesticides and other chemicals
that may be transported to streams in water runoff. The closer agriculture
is to a stream the more likely related pollutants will enter the
stream. Concentrations of pollutants transported into streams are
also more likely to be higher when agriculture is closer to streams. |