"Wily Wilde" wrote in message

has anyone else done this? installed a system of underground pipes
for your
garden watering needs?

We have underground pipes all over the place to meet our garden
watering needs.

i'm thinking of doing something similar using old pvc pipes, porous
"skin"
pipes connected to a water tank.

I'm not sure what you really mean. The porous or leaky hoses wouldn't
be fitted directly onto a water tank surely???