The purposes of this project are to inspect the drainage and detect the covered manhole under the Cheng An Road,57 Alley Cheng An Road,318 Alley Sec.2 An Ho Road in Hoshun Industry Park.The results of this project is： 1.We use metal detector and magnetic flux meter to find the covered manhole R3、R4、R6、R7、L8、M7、M10., besides we use CCTV system to find the covered manhole R7-1、R9、L7-1、C3、D6、E3. 2. The length of road’s side ditch CCTV inspection is 1,852m. We detect 118 unknown pipes, including 81 protruding pipes , 31 ditches and 6 cross pipes.The protruding pipes are classified into 3 types：(1) Green type：The protruding pipe belongs to residential house.(2) Yellow type：The protruding pipe belongs to factory,but no draining when we inspected.(3) Red type：The protruding pipe belongs to factory,and is draining when we inspected. 3. The number of drainage branch CCTV inspection is 16. We didn’t find any protruding pipe , but in R5 branch pipe , We found its bottom has corroded by unknown liquid. 4. The drainage under 318 Alley Sec.2 An Ho Road turn to the factory area of Taiwan Kai Yih Co., then connected with the drainage under Cheng An Road. 5. We finish the measurement of road , street , factory , manhole in target area and plot the map by 2 degree wide Transverse Mercator projections.

Drainage , Closed Circuit Television Video Camera Inspection , Protruding Pipe