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Temperature dependence of infiltration rate during large scale water recharge into soils

Dep. of Soil and Water Sci., The Hebrew Univ. of Jerusalem, P.O. Box 12, Rehovot 76100, Israel

View larger version (25K): [in a new window]   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).

View larger version (18K): [in a new window]   Fig. 2. Infiltration rate (IR) per cycle and average effluent temperature (T) per cycle measured in large scale recharge basins at the Shafdan wastewater treatment plant across a 4-yr period. Curves were obtained by smoothing (five-point moving average) of the measured data. Dashed lines indicate recharge regime change in Basin 102 on 1 July 2000 (see Table 1). F = fall, Sm = summer, Sp = spring; W = winter.

View larger version (15K): [in a new window]   Fig. 3. Observation-based seasonal changes of measured relative infiltration rate (ORIR) and calculated viscosity-based relative infiltration rate (VRIR) in the Shafdan wastewater treatment plant. RIR = ORIR + VRIR; F = fall; Sm = summer; Sp = spring; W = winter.