Planting trees over sewer pipes

[husky]

Hi guys,

While looking into where I want to plant some trees in our garden, I noticed two sewer drain lids. Contacted the water mob and sure enough we have a main line running along our back fence 2250 deep and 150mm PVC pipe apparently. There is also a pick up point to the side of our property so there must also be a pipe running down the side of the block. Problem is that these are the only two locations that I can plant any trees(cerrrently we have no trees or bushes at all!). I have already purchased many of the trees which are all eucalyptus at this stage. The ones I would like to plant are (ignore sp)

Torquata
Lexycoclyn rosea
forrestiana
dwarf ghost gum
dwarf gregsonia
euky dwarf

Does anyone know if these have invasive root systems that will get into the pipe? Or know of any trees with non invasive root syatems?
Im hoping the pipes being PVC will not seep water and therefore the trees shouldnt go looking for water there. We are also on wet clay so there is plenty of water around.
cheers

[echnidna]

All trees have invasive root systems that will charge towards a water supply

[DavidG]

Also the ground is softer where the pipes were laid so the roots will follow the pipes looking for the smallest opportunity to get inside.

[Terrian]

Does anyone know if these have invasive root systems that will get into the pipe? Or know of any trees with non invasive root syatems?

All tress have invasive root system, some more than others.

Im hoping the pipes being PVC will not seep water and therefore the trees shouldnt go looking for water there. We are also on wet clay so there is plenty of water around.
cheers

assume the pvc has no leaks, now assume a root grows next to the pvc, 5 years down the track when the root has gone from 1mm to 200mm in diameter and the pvc pipe has split or buckled, who is going to foot the bill to remove the tree and repair the pipe.... food for thought