Local Soil Conditions: York County soils are classic Piedmont Ultisols — Cecil sandy clay loam, Pacolet sandy clay loam, and Davidson clay loam — formed from weathered granite, gneiss, and mica schist. Cecil sandy clay loam has an argillic Bt horizon beginning at 4-10 inches with clay contents of 35-60%, moderately slow to slow permeability (0.06-0.2 in/hr), and is well-drained with water tables generally below 48 inches. Pacolet soils are similar with steeper slopes and shallower effective depth to saprolite. Davidson clay loam, forming from mafic rocks, has even higher clay contents (50-70%) and very slow permeability.
Water Table: Water tables are generally deep (48-72+ inches) on upland Piedmont positions. Seasonal high water tables at 24-36 inches in footslope and drainage way positions. The Catawba River floodplain has seasonal water tables near the surface.
Climate Impact: Rock Hill has a humid subtropical climate with hot summers and mild winters. Annual rainfall averages 48 inches, distributed throughout the year with a spring and summer peak. Rock Hill's position just south of the NC-SC state line gives it essentially the same climate as Charlotte, NC. Summer thunderstorms are intense and can rapidly saturate clay Piedmont soils, creating temporary drain field stress.