Fig. 1. The layout of the infiltration basins in the Soreq site of the Dan wastewater treatment plant near Tel-Aviv, Israel. Infiltration rate was measured from December 1997 to December 1999 in Basin-field 103 (Subbasin 103-4/5, leveled at 40 m above sea level) and from March 2000 to March 2002 in Basin-field 102 (Subbasins 102-1 to 102-5, leveled at 45 m above sea level).