Changes with time (3 years), soil depth (60 cm), and location in relation to main drain or main irrigation canal (within 48 feddans) in soil salinity, sodicity, water table, and CaCO3 were mentioned after laying a subsoil drainage system. the system was designed and installed by the ministry of irrigation in a clay soil in Giza (laterals 150 cm and 40 m apart). The soil (saline-sodic) had EC of up to 15 mmohs/cm/25 C, ESP of up to 24 and pH of up to 8.8. It was improved to nonsaline-nonsodic soil having EC less than 3 mmohs/cm/25 C. ESP less than 13 and pH from 7.6 to 8.3. Soil CaCO3 (3-8%) helped nonalkalization during reclamation, particularly with using Nile water. The shallow 37-55 water-table deepened to 75-101 cm by the 3rd year, with an average of 88 cm depth. At all times, salts, ESP, and pH decreased with depth except in some cases of slight increase in Na, CO3 and HCO3. The nearer the land to either the main irrigation canal or the main opened drain, the more saline and sodic it was indicating water seepage from this canals to adjacent soil. It is important to keep water going to subsoil drains to flow out and away of land (by adequate maintenance) although deepening of water-table may not go beyond 90 cm. Thus a decrease of saline is sure.