"JimG" wrote in message
...

On Wednesday, April 16, 2014 7:12:44 PM UTC+1, Andrew Mawson wrote:
"JimG" wrote in message

...



Our garden is near the base of an incline where the subsoil is clay.
When

there is heavy rain, the lawn becomes sodden and often there is surface

water. Currently considering putting in perforated pipe land drains and

collecting the water in a large underground tank.



The plan then is to automatically pump out the tank when it is full and

here is where I would appreciate some advice.



Should I go for a submersible pump or an above ground pump that will
work

with a negative head ie a lift of about 4 feet? Alternatively should I
put

a pump in the pit alongside the tank?



Any advice would be appreciated. Thanks.



Whatever you choose make sure that it is 'solids capable' - you'll be
amazed

what will end up in it However if you have somewhere lower to pump it
why

don't you lead your underground drain there and avoid the tank and pump

altogether. (I'm sure that you're not considering dumping it into the
public

sewer !!)



Andrew

There were old land drains there before which drained in to the foul water
drain but these got silted up and broken up when a patio was constructed.

Have things changed so that it is against the regs to let your run-off go
into the drains?

Not up to current regs as we have our own private sewage system, but
certainly surface water never used to be permitted into foul drains without
a license having paid an annual fee. Surface water is supposed to go into
soakaways.

Andrew