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Ok... so if I use gravel to cover up the pipe...would it cause pressure to the pipe and break it at some stage?? I assume gravel and pretty hard object and pipe can be vulnerable?? and would this work:

Can I use this http://www.bunnings.com.au/gravel-bagged-riversands-20kg-drainage-303_p0760258

Thanks for replying. Do you know where I can get those gravel? Would Bunnings have them? Also, do you mean the pipe would be wrapped with those gravel? Would that cause pressure to the pipe and might break it? What you mean by water down, the gravel?

I have a couple of issues with my existing pavings: 1. Some of the pavers start sinking, typically along the trench lines where there are pits. If I lifted some of the pavers up, this is what I can see.. The paver guy actually lifted them all up before and checked the pipe...