Experiment was conducted at Al-Anbar university, Ramadi city to study the effects of fuel oil and shenmblan plant on some hydraulic properties of the gypsum soil . After dilution with benzene, fuel oil was mixed with soil in the ratio of 1 and 2 % based on soil dry weight. The plant was air dried and sieved through 2 cm diameter sieve and mixed with the soil in the ratio of 2, 4 and 6 % based on soil dry weight. Fuel and shenmblan plant mixed soil was incubated at field capacity for 30 days. Control was let without any addition.
Horizontal water infiltration was estimated . Soil water diffusivity and Weighted Mean diffusivity was calculated. Unsaturated hydraulic conductivity as a function of volume moisture content. Data of distance of wetting front development with time were used for estimation of soil water permeability .Sorptivity was estimated from data of horizontal water infiltration in soil columns.
Results could be briefed as follows:
Soil water diffusivity and weighted mean diffusivity decreased when fuel oil and shenmblan plant were added. The decrease continued with increase in fuel oil and shenmblan plant ratios. unsaturated hydraulic conductivity decreased as fuel oil and shenmblan plant ratios increased. Addition of fuel oil and shenmblan plant caused a decrease in soil Penetrability to water . This decrease continued with increasing the ratios of fuel oil and shenmblan plant. Permeability value was 2.4980 cm/min1/2 for control and became 2.2084 and 2.1598 cm/min1/2 for l and 2 % fuel oil treatments, respectively, and 2.3160, 2.1916 and 1.8648 cm/min1/2 for 2 , 4 and 6 % of the shenmblan plant treatments , respectively . Sorptivity decreased when fuel oil and shenmblan plant were added .The value was 1.9057 cm/min1/2 for control, and became 1.8461 and 1.8095 cm/min1/2 for land 2 % fuel oil treatments, respectively, and 1.5414, 1.4705 and 1.2463 cm/min1/2 for 2, 4 and 6 % of the shenmblan plant treatments, respectively.