Some areas have surfaces covered with gravel, cobble and stones. Slopes are 0 to 9 percent. The soils formed in stratified mixed alluvium. Elevations are near sea level to 2500 feet. The climate is arid with very hot dry summers and warm slightly moist winters.
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.