Surface and subsurface waters from the regions surrounding Khorian, Melhe, Kabodeh, Arche, Chah Hoseini and Chah Shirin are being drained into a playa located 45 Km south of Semnan. In order to study water table fluctuations in the playa margin, ten pits were dug in different facies of both sides of the salt mine road that goes into the playa. Every month (20th-day) water table was measured from a constant point above each pit and hydrograph of each pit was plotted and amount of monthly water table fluctuations was measured and compared with its level in September. It was concluded that water table fluctuation in different facies depends not only on evaporation, but also related to other factors such as soil texture, porosity, permeability, topography, hydrulic gradient, amount of salt, and other hydrology and hydrogeology factors. The results showed that average rise in water table in 10 pits were 6.2 Cm in the month of May. Therefore, May was the best time for cultivation of hydrophyte and halophyte plants that collect their needed water from storage. The average maximum decrease in water table was -8 Cm in November. If this situation continues for several years, November month will be a critical time for hydrophyte and halophyte plants, because of maximum decline in the water table. The average annual amount of water table decline in 10 pits was 6.5 Cm and the volume of water decline in 14 hectare was 455 m3. This may indicate that the area was in a dry period.