On 20 Aug, 11:21, Matty F wrote:
On Aug 20, 9:41 pm, cynic wrote:

This might sound pedantic but having suffered through the devastation
of the 2007 floods and the ensuing investigations as to why our
village suffered so badly it emerged that a few thoughtless
individuals had unlawfully piped various dykes. Such activity is
controlled under the 1936 public health act and the 1994 land drainage
acts. Any such works should only be done after the permission of the
local drainage authority has been granted. Note that design figures
for flow may be required although if there is an upstream culvert
nearby the usual simple requirement is for your pipe to be at least as
big as this.
In our case one clown put in two parallel 12" pipes despite there
being a 36" pipe council culvert upstream. Go do the maths!
Note also this also applies to private dykes running across private
land.

This is a tiny but annoying amount of water.
The total catchment area is a lawn. The utility company has drilled a
hole under the lawn and under the foundations of the house and put
wires through the hole. Water now trickles from the lawn to the hole
and under the house into a trench that used to be dry.
I estimate that if it rains heavily there will be a maximum of 10
litres of water per minute coming down the trench. In practice the
amount of water looks like that out of a slow running tap.
I propose putting a 40 mm diameter pipe in the trench and piping it
outside to the lower side of the house.
I want the water to go down the pipe and stop going down the trench,
so I need to block the trench somehow. Perhaps concrete would do.
It's winter here so the trench is always wet and concrete may not set
well.

oh concrete will set, just keeping it where you want it whilst it does
if raining/water flowing at time - Bin liner - i.e. effectively make
"a bag of concrete"? will mould to contours around pipe and sides of
ditch and not get washed out whilst setting....

perforate the pipe with angle grinder for first couple if yards, lay
pipe on and surround with clean crushed rock, all sat on & wrapped
around in geotextile (to stop silts bunging up holes in pipe)?

Hard to visualise what you are up against ;)

Cheers
Jim K