Iam doing some digging in my garden (going to be turfed and no vehicle access) and have noticed that the underground pipes for both my downspouts are in 68mm downspout pipe, there is no inspection points etc just an elbow on the end of each downspout and a clay and concrete formation where both downspouts meet at a Y and go out under the pavement to the road to drain.
Should all these pipes be replaced in 110mm with gullys at each downspout and a proper inspection chamber to join the two before going out to road drain? The outlet to the road drain is clay and about the same size as the 68mm pipe.
The only problem I could see with having an inspection chamber is the highest point of the outlet (top of the pipe to road) is about 150mm below the finished level, and to get the falls on the pipes from the downspouts they would have to be lower than the outlet.
Should all these pipes be replaced in 110mm with gullys at each downspout and a proper inspection chamber to join the two before going out to road drain? The outlet to the road drain is clay and about the same size as the 68mm pipe.
The only problem I could see with having an inspection chamber is the highest point of the outlet (top of the pipe to road) is about 150mm below the finished level, and to get the falls on the pipes from the downspouts they would have to be lower than the outlet.