2012 Volume 80 Issue 2 Pages 87-95
Some of irrigation tunnels, that service not only irrigation water but also tap water, industrial water, and irrigation water for farming crops in winter, have high social importance as lifeline. But it is very difficult to diagnose these agricultural facilities because they can never stop water supply through a year. To diagnose these facilities under water servicing, the authors developed a survey system for irrigation tunnels. This system can record various defective events such as cracks, water inflow, calcium efflorescence, and so on. The advantage of this system is a high sensitive CCD camera, which is automatically controlled in order to follow the concrete lining of irrigation tunnel to take continuous digital front view. As a result of onsite experiment, this system can detect cracks that have more than 1.5mm width, free lime, and leakage of water. So it is effective as the mean for a primary survey.