Fig. 9. Measured cumulative precipitation (P), runoff (R_o), and net infiltration (net I = P – R_o) and calculated cumulative evapotranspiration (ET) for the ET engineered cover to the 1.1-m depth for water years 1998 through 2002 at the New Mexico site. The long-term (1961–1990) average annual precipitation of 226 mm is shown (±55 mm 1 ).