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Most of the northeastern parts of the delta are distinguished with low-lying areas, clay to heavy clay soils with low permeability, saline to saline-sodic soils, shallow and salty ground water, and artesian zone. Wider spacing accompanied with auxiliary treatments should be tested to increase the efficiency of subsurface drainage. The aim is to study soil properties as affected by drainage types for evaluating improvement soil condition for sustainable land use to prevent soil deterioration. The El-Serw Drainage experimental field of 20 feddan (8.ha) was designed with three-drain spacing treatments, 15 m., 30 m. and 60 metre separated by buffer zones. The two submain treatments are parallel and net subsoiling with 1.5 metre apart and 50 cm. Depth.

Drain spacing and subsoiling type as well as interaction between them is highly affected on water table depth and following the order: 15 m > 30 m > 60 m drain spacing and net > parallel > no subsoiling. The best treatment for dropping water table is 15 m spacing combined with net subsoiling for three seasons. Soil salinity is highly decreased in the upper surface layer than the deeper layers by drainage treatments. Cover drains combined with subsoiling type treatments are more affected on salinity than either tile drainage only or subsoiling only. The best treatment is 15 m drain spacing combined with net subsoiling treatments. Exchangeable sodium seems that drain spacing or combined with subsoiling are slightly effect on exchangeable sodium percentage especially on the soil surface layer. The net subsoiling is relatively more influence than parallel subsoiling. Soil moisture content, bulk density, soil porozity and shrinkage are hsignificantly affected with both treatments.