If you need to cut a shallow channel into a concrete floor to accommodate plumbing, electrical or another purpose, the quickest and easiest way is with a diamond-blade wet concrete/asphalt saw, which you can rent from many tool rental centers.
Can you cut drainage channel?
Please note the drainage channel can be cut up to a maximum of half a metre (only the galvanised grid could be cut to half a metre). Place the drainage channels at the desired height on the base of concrete or stabilised sand (or on the wooden supports in case of option 3b).
How do you install a channel drain in a concrete slab?
https://www.youtube.com/watch?v=-rG-7alUbHg
How do you cut a trench in a concrete floor?
Use a standard circular saw, equipped with a corundum or diamond blade, for small tasks. For slabs, it's best to cut through the top inch, then use a sledgehammer to break off the rest. The jagged edge left below the cutting line provides a good rough edge for the new concrete to bond to.