Symbol SD SSD AW TWR DWS DWR sw CD DI DE Table 1-1 Standard Plumbing and Piping Symbols Abbreviation SD, ST SSD S, W, SAN, SS AW AV cw TEMP. HW, TW TEMP. HWR, TWR DWS DWR sw CD DE (Continued) Description Storm drain, rainwater drain Subsoil drain, footing drain Soil, waste, or sanitary sewer Acid waste Acid vent Indirect drain Pump discharge ...