Fig. 3. Measured cumulative precipitation (P), irrigation (Irr), runoff (R_o), and net infiltration (Net I = P + Irr – R_o) and calculated cumulative ET for the CBET cover system for 1998 through 2001 water years at the Texas site. The long-term (1962–1990) average annual precipitation of 311 mm is shown (± 102 mm 1). Water year 2001 cumulative values are Irr: 2340 mm, R_o: 1866 mm, net I: 673 mm, and ET: 630 mm.