Understanding the interactions of ground water and surface water is one of the most important challenges among hydrogeologist. Hydraulic gradient between ground water and surface water, as well as hydraulic conductivity of streambed sediments are required to determine ground water and surface water exchanges. Minipiezometers are simple instruments that measure flow direction and hydraulic gradients between ground water and surface water. Often temporarily installed, minipiezometers are essentially small-scaled versions of piezometers, which are commonly used to make groundwater level measurements. By combining water table data with surface water level measurements, flow direction can be determined. Minipiezometers are typically used where many measurments are required. Commercial minipiezometers are available but they are very expensive. The purpose of this paper is to design and construction a low-cost minipiezometer for measuring ground water and surface water exchanges. In this study, a minipiezometer made by simple and available materials such as steel pipe, steel rob, clear plastic hose, gas valves, hand vacuum pump, hammer, U-shape clear tubing, graduated manometer board, and graduated transparent plastic cylinder was successfully tested in the Solghan River in western Tehran

Achievement

 Quantity determination the Surface water- Groundwater Interactions (Aghmion River and Sarab Plain )

 Construction of physical simulation system for surface and groundwater interaction

 Design and construction of mini piezometer