Table 1. County environmental and landuse variables used in the RTA process.

1) TAWC -> Total available water capacity (cm, to 152 cm)

2) CEC -> Cation exchange capacity

3) PH -> Soil pH

4) PERM -> Soil permeability rate (cm/hour)

5) CLAY -> Percent clay (< 0.002 mm size)

6) BD -> Soil bulk density (g/m2)

7) ROCKFRAG -> Percent weight of rock fragments 8-25 cm

8) NO10 -> Percent passing sieve No. 10 (coarse)

9) NO200 -> Percent passing sieve No. 200 (fine)

10) KFFACT -> Soil erodibility factor, rock fragments free

11) OM -> Organic matter content (% by weight)

12) ROCKDEP -> Depth to bedrock (cm)

13) SLOPE -> Soil slope (percent)

14) ORD -> Potential soil productivity, m3 of timber/ha)

15) ED -> Edge density (m/ha)

16) DIST.LND -> Disturbed land (%)

17) ALFISOL -> Alfisol (%)

18) INCEPTSL -> Inceptisol (%)

19) MOLLISOL -> Mollisol (%)

20) SPODOSOL -> Spodosol (%)

21) ULTISOL -> Ultisol (%)

22) FORST.LND -> Forest land (%)

23) GRAZE.PST -> Grazing pasture land.(%)

24) CROPS -> Cropland (%)

25) MIN.ELV -> Minimum elevation (m)

26) MAX.ELV -> Maximum elevation (m)

27) ELV.CV -> Elevation coefficient of variation

28) MAYSEPT -> Mean May-September temperature (deg. C)

29) JARPPET -> July-August ratio of precipitation to PET

30) JANT -> Mean January temperature (deg. C)

31) JULT -> Mean July temperature (deg. C)

32) AVGT -> Mean annual temperature (deg. C)

33) PET -> Potential evapotranspiration (mm/month)

34) PPT -> Annual precipitation (mm)