joint in elevated water retaining structure

[Structures33]

Hey there - I have a wwtp structure (all concrete) that will have elevated channels/tanks holding water. I am using a typical control joint on the slab on grade below and a construction joint w/ waterstop for the exterior tank wall joints. What suggestions do you have for the joint in the elevated slab? I need to have a construction joint but am worried about maintaining water-tightness.

Details: The elevated slab has a pretty good run of approximately 110 feet - I'm planning to break it up into about 5 sections with joints. The width is about 26'. Where I have joints in the slab, I will also have joints in the channel walls (walls run parallel to the long direction of the slab).
Thanks

 

[jike]

Use the same waterstop in the slab as in the wall and specify that the supplier shall provide prefabricated joints at the intersection. Make sure all waterstops are continuously tied to each other. You might even draw a 3D depiction of what it should look like. This will help the contractor understand what needs to be provided.