Ground penetrating radar (GPR) investigation has been conducted on the old submerged siphon beneath El mahmodia channel of Edko at Damanhur city, Egypt. This siphon is a submerged water construction allowing the water drains to pass underneath irrigation water channels and canals. The siphon has a mouth where the drain's water enters and an exit where the drain's water goes out. It is a normal situation to find two bridges; one passing over the mouth and the other passing over the exit. The loads over the siphon might be affecting its geotechnical situation.
The GPR profiles have been conducted using the GPR SIR system -10A connected to 200 MHz antenna. The survey is oriented to allocate the cracks, fractures, deformities and the distortion places in the siphon's body. Eight GPR profiles were conducted, five profiles were carried out in the northeastern side (the mouth) and three profiles were in the southwestern side (the exit). The measured GPR data are processed and visualized using Reflex software program (Reflex W2d/3d) in different ways to show the infra-structural content of the submerged Siphon body. Interpretations of the processed data show some deformities and the distortion places in the body of the submerged Siphon at different location with different depths. The horizontal distances range from 20m to 28m and the subsurface depth ranges from 4m to 6m in both sides of the submerged siphon. Detection of the deformities is the target of the present study.
INTRODUCTION The study area is located at Damanhur city near Ashur Bridge,