AERIAL IMAGE & UNDER GROUND TUNNEL IMAGING  DRONES  Aerial drone Images when used for surveys and Aerial images, underground tunnel images as well as 3D images are able to monitor maintainence and inspection work 5 ft deep in the earth drainage ways  Flash Flooding , water logging    due to  sewage water drainage pipe blocks are now monitored by drone in Europe by Aguas de Barcelona company Scanning the sewage water ways by using drone to capture images and vedieo of sewage pipe than is 2 meter deep to 5.5 meter deep below the earth surface Drone are used to scan the amount of slit deposited in pipe passing below the earth surface  and to check the leakage of sewage drainage pipe line  that can contaminate the drinking water pipe linex The more the deeper line , the high efficient drone are used The scanning and maintainence work can be done to avoid water logging in heavy rain due to blocks in sewage drainage pipe that connecting the drainage water ways to river