Thanks guys.

dave...its an estate of inner city living...what you see is Rainwater recycle tanks (red) 40m long and 2.25 m in diameter 6 m deep and the other is the pipe system to collect the rain. The rest are kerbs and roads. I am about 1/3 finished on that one...lots of calc and mayh..you can have a go??

cheers bullet

The blue is a 0.8m existing steel potable water mzain that goes acroos the site...I have to see and make sure the design pipework on (5) different component layers dont clash with it...1 already does...bahahaha typical crap design