Thornthwaite annual P-E indices of 32 to 44. These are the similar Spur series and the Colorado , Guadalupe , Lincoln , Sweetwater , Yahola , and Yomont series. Colorado soils do not have a mollic epipedon. Guadalupe, Lincoln, Yahola, and Yomont soils lack mollic epipedons. Sweetwater soils have dark gray A1 horizons, are poorly drained, and are sandy in the lower part of the control section.
Permeability is moderate.
Runoff is negligible on slopes less than 1 percent and very low on 1 to 3 percent slopes. The soils overflow for very brief periods about 1 or 2 times a year to once in 10 years. These soils are used for both cultivated crops and rangeland. Native grasses are blue grama, buffalograss, sideoats grama, western wheatgrass, and switchgrass. In eastern Rolling Plains, Rolling Limestone Prairie and North Central Prairie of Texas and southwestern Oklahoma.