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<br />Table 1. -Selected soil series, horizons, and soil properties which illustrate types of soils and parent .. <br /> materialsfound in the American River Watershed <br /> Available <br /> Horizon Parent water-holding p. <br />Soil series Horizons thickness material Texture Permeability capacity pH <br /> mm (in) mm/h (in/h) <br />"'Mariposa AI 0- 200 ( 0- 8) metasedimentary gravelly silt 15- 50 (0.6-2.0) 5.1-6.5 <br /> loam <br /> B2t 3 10- 660 (15-26) gravelly silt 15- 50 ( .6-2.0) 0.13 5.1-6.5 <br /> loam <br />'" Auburn AI 0- 80 ( 0- 3) basic meta- silt loam 15- 50 ( .6-2.0) 0.18 6.1-7.3 <br /> volcanic <br /> B2 80- 360 ( 3-14) silt loam 15- 50 ( .6-2.0) 0.18 6.1-7.3 <br />"'Aiken Al 0- 230 ( 0- 9) andesitic loam 15- 50 ( .6-2.0) 0.16 5.6-6.0 <br /> conglomerate <br /> A3 230- 610 ( 9-24) clay loam 15- 50 ( .6-2.0) 0.18 5.6-6.0 <br /> B2t 890-1320 (35-52) clay 5- 15 ( .2-0.6) 0.16 5.1-5.5 <br />"'Holland AI 0- 250 ( 0-10) granitic rock coarse sandy 50-160 (2.0-6.3) 0.11 5.6-6.0 <br /> loam <br /> A3 250- 530 (10-21) coarse sandy 50-160 (2.0-6.3) 0.11 5.6-6.0 <br /> loam <br /> B2t 530- 910 (21-36) sandy clay 5-150 (0.2-6.0) 0.15 5.1-6.0 <br /> loam <br />"'Data from Eldorado Soil Survey Report (Rogers [3]) <br /> <br />~ <br /> <br />F <br /> <br />IV-8 <br />