On 31/08/2017 08:43, Tim+ wrote:
N_Cook wrote:
Since the recent Coverack inundation and finding an archive newspaper
ref to a similar event ,locally , 60 years ago.
Where we are the problem is roof-run off rain getting into the sewer
system , from thousands of older houses, then the sewer system directly
under us going to a large sewage works, that cannot handle such
inundations, and all backs up rainwater and sewage.
I assume 4 inch/100mm sewer pipe screw-enlarge test bungs would be too
large for the first bend of bog-pan traps.
Kids plastic beach ball perhaps , firmly pushed down there and cut to
remove later perhaps.
Sink and bath plugs weighted down with anything heavy , but how to
temporarily block off sink and bath overflow holes? any other ideas?


Google?

Almost the first hit on "sewer pipe valve".

http://www.plasticdrainage.co.uk/ant...3b&fo_s=gplauk

Tim


Yes the people most liable to marine flooding , 1 in 5 year or so , have
one-way valves now fitted in their systems along with loads of other
stuff. Put the people in the slightly higher areas, who may get a 1 in
50 year intense rainfall event and should have an emergency procedure
available, in the interim, before they know for certain about this other
flooding scenario, after the next such event.
Incidently the set of new one-way valves presumably increases the chance
for house interior sewage flooding, as no longer that pressure releif
lower down