Assesment and analysis of the aquifers in the Varzaneh plain

In this paper, the status of groundwater hydrology and hydrogeology plain of Varzaneh was studied. In the hydrology section, the annual average of Zayandehrood river flow in stations of Varzaneh and Cham was investigated. The unit hydrograph of the plain was also illustrated. In hydrogeology section, the software of RockWorks Ver.15 was used and log of wells and also the geological model of Varzaneh plain were prepared according to the logs and material of their layers. The contours lines of underground water level in unconfined andconfined aquifer in the Varzaneh plain were drawn using Surfer Ver.10 software. Also the hydraulic gradient for groundwater flow in the plain area was found. The maximum value of hydraulic gradient was 0.008 from center of plain to the South East. In the past decade, the ten-years unit hydrograph of plain showed that the amount of underground water level was dropped by 1.3 meters, i.e. which the mean of annual loss was 13 centimeters.