Land Use

• Drought conditions prevailed in the late 70's, while there was some flushing in the mid 80's, and more in the late period.
• Agricultural land is being steadily replaced by residential and commercial property.
• Because the earlier map contained far greater detail than the later map, we combined various land uses to make maps with commensurate categories.
• Comparisons were made for these land-use types: residential, commercial, and industrial use; cropland and pastureland; orchards and groves; feedlots and dairies (cattle); and brush and scrub rangeland.

  
Table 1: Average nitrate values, by landuse, using cokriged maps

  
Table 2: Percentage exceeding 10 ppm

  
Table 3: Percentage of representation, versus percentage of high representation