Hello I am up north and we put rainpipes around the roof ...now i need to bring out the water from the land...wanna build a long drain and looking for a half pipe ( pipe only half round ) to let the water flow out ...i thought it would be easy task but the shops dont seem to have it...anyone have an idea ? thank you

How long / big 

I'm sure you've thought of the old grinder 

Do you need to cover it

 These half pipes often clog, In the US we use perforated pipe,

a dich is dug out . a bed of gravel is laid at the bottom,contrary to instinct, the holes are placed at the bottom of the pipe, and the water rises into the pipe from the gravel bed and rons out via the cavity that the pipe provides, any silt is washed out via the holes at the bottom of the pipe. If the holes were placed on the top, dirt will settle in to the pipe and would eventually clog the pipe. 

 

a half pipe is also a viable solution bu more problematic IMO bu if you insist ( might have good reasons) then any table saw can easily split a full PVC drain pipe in half, if table shaw is not available, it can be easily done with a circular saw . If you decide to split  a PVC pipe with a circular saw PM me and I will show you how to make a jig. or go on YouTube, several videos on how to make an easy  circular saw jig.

 

Your in the ""not going to find it" section of Thai products I think
Can you make a concrete or cement trough to do the same job? Real easy to set out and get right
Otherwise bury a normal pipe running to the outlet point?

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We used 6" concrete pipe (cheap) cut in half with a concrete blade in the angle grinder.

 

Best idea;

2 hours ago, Crossy said:

We used 6" concrete pipe (cheap) cut in half with a concrete blade in the angle grinder.

I buried pvc pipe, but everything will depend on your grades to & from.

Double wall corrugated PE Pipe | with interior diameter of 100 mm, 150mm, 200mm, 300mm, 400mm, 500mm, or even 600mm are readily available in Buriram. Fittings including L90 Tap elbow, T Tap, T45-Lateral, X-Tap Cross X Tap are available in Issan. I've seen these in use at a farm in Nong Song Hong on the way to Phutthaisong.