Rainfall occurs as gentle winter rains or as erratic high intensity summer storms. Torrential summer thunder showers occasionally produce enough runoff to flood the soil for brief periods of a few hours. Mean annual precipitation is 2 to 8 inches, ranging to 10 inches in Arizona. These are the similar Carsitas soils and the Chuckawalla , Imperial , and Niland soils. Chuckawalla soils have argillic horizons.
Imperial soils are fine textured.
Niland soils have coarse texture in the upper part of the series control section and fine texture in the lower part. Carrizo soils with loam or sandy loam surface textures have moderate or moderately rapid over rapid or very rapid permeability. Used as a source of sand and gravel for construction material. Vegetation is a sparse growth of cacti, creosotebush, white bursage, mesquite, and paloverde. The soil is extensive.