how deep for drainage pipe

My house is on the slope. I have asked the plumber to install a drainage around the house. I am just wondering how deep to bury the drainage pipe, because the plumber did lay the pipe to high. We can see the pipe from the topsoil. ALso ,When the tenant mowed the lawn , the lawn mower hit the pipe.

 

The plumber should know the requirements. And pipe type and joints etc. That is way too shallow. Its unprotected from damage. When we put our old pool in the pump to sewer had to be 300mm or more down but due to fall had to be 450mm at one end to meet 300mm at the shallowest point. Stormwater is less...Thinks its 100mm. That is the MINIMUM. maximum depth can be as much as you like...It just gets costly

Let me guess you sought a low cost plumbing quote?. The pipe is the cheap part. The trench and excavation is the pricey part

The tenant wouldnt be liable for the regular and frequent pipe damage. The vehicle tracks over the pipe will break it. Its only PVC

 

where does it drain to? keep in mind that water flows from higher point to lower point, so your pipe cannot be lower than the discharge point, otherwise the water will just sit in the pipe and not drain anywhere.

if there's not enough incline, you/they might need to incorporate pits to provide an artificial incline (or whatever else they learn when getting those plumber licenses)

 

I'm guessing that is stormwater
100mm would be the minimum coverage and it should also have fall/slope.
The pipe may have have floated if there's been a lot of rain shortly after installation

 

No it is not the cheapest. He charged me $10k which include turf laying. The house is located in qld. Are there anything I can do about it. Can Anyone help me with this
Thanks

 

When the Tenant cut the grass on this property what sort of machinery was used as those tracks are not from a normal push model..
Looking at the size of the storm water pipe and the way it's set then even with the fall that may not work too well.
Depending on where this property is located as most in Qld are coded the say way.
So start there With the local plumbing codes as this should be a few 100mm lower .
Another item is checked to see if the person you employed is a lic contractor in Qld because if that pipework was set on drainage gravel as it should be then it would have never lifted.

 

The house is at Redbank plain. the plumber does have license, and he is from the managing agent

 

What does this property back onto is This one of the flood zones that is in the lower older estates in the area ..

 

The house is not on the flood zone, but it is on a slope

 

I am trying to call the plumber to come back, but he is very slack
Are there anything I can do as the tenant will move out end of next month

 

If they dont come back its likley a license complaint for workmanship contrary to code and a tribunal claim. Let the PM know the plumber shouldnt be used if they dont do a proper job - Maybe they have some leverage to have numpty come back and dig it all up and redo

 

Bloody hell. I let the pm know, and she said “ground needs time to settle before anyone drives over them”, but the plumber will reattend the site

 

Did you let her know that if the ground settles any further you'll trip over the pipe?