Sewer beneath Pellatt road

[Nattaliec]

Does anyone know anything about the sewer that runs beneath Pellatt road? Any residents know if this could cause problems with subsidence or affect our chances of getting planning permission for a kitchen extension? We are close to completing on a property on this road but just found out about the sewer and are worried it could prevent us from doing a side return. Does anyone know of any issues with surface water or sewage leaking too? Many thanks.

[motorbird83]

Have PM'd you.

[mikeb]

The main Effra Branch Sewer passes along Lordship Lane but I don't think it goes down Pellatt Road. Maybe there is another sewer underneath Pellatt Road, probably only a minor one though.

Courtesy of John K, I have some detailed maps which are way too large to upload. These show the Effra Branch Sewer as it heads NE from Dulwich Village (junction with Court Lane) over fields to join Lordship Lane just north of Elm House i.e. roughly where Colwell Street joins Lordship Lane; on the way, it crosses what is now Townley Road roughly with Beauval Road. The sewer then follows Lordship Lane past Blackwater Cotttage before crossing Lordship Lane at North Cross Road to head NE to up with East Dulwich Road just past Crystal Palace Road and then heading off to Nunhead. Attached maps may help and the link below is an appropriate map from about the same time.

http://www.mappalondon.com/london/south-east/peckham-rye.jpg

[Penguin68]

Completely off topic, but is what is shown as Harris Road in the mappaplondon link now pretty well on the route of Crystal Palace Road, with what is shown as a very short Manor Road the start of what is now Barry? Fascinating.

[bargee99]

I think you are referring to the very large water main that was run from somewhere West (Mitcham way?) to Honor Oak reservoir several years ago. It is deep and large. They came round inspecting houses and taking pictures to avoid claims for any subsidence claims from the boring for it's installation. Cuts through around the Landcroft Road / Pellatt Road junction area heading in the direction of the Great Exhibition.

[singalto]

I live in Pellatt rd and they did a very thorough survey. They said they would come back after completion of the sewer but haven't.

[bargee99]

Don't think it was a sewer but a large water main. They did inspect thoroughly and said it should be declared on any sale of the property.

[edhistory]

I'm with mikeB.

The two types of sewer should cause no problems.

There may be a problem if your neighbours' outlets to the foul sewer run under your house.

Thames Water ran a public consultation for the new water ring main. For a short time maps showing the route and depth of the main were available. It is deep tunneling. Thames Water would probably send a copy.

John K

[MM22]

We live On pellatt Road. Had no idea About sewer. Applied for side return and kitchen extension and got full approval but pulled out last minute for other reasons. Architects and builders had no concerns. No mention of problem with sewer. No issues with sewage water or surface leaks or subsidence either. Hope that helps, feel free to contact me if you need more info.

[mikeb]

I can't find a map of the southern extension to the London Ring Main on the web, though as John says Thames Water may be able to help. The list of streets below was posted on the forum in 2008 in an alarmist post and presumably came from a leaflet at the time

Beechdale Road

Fairmount Road

Arodene Road

Helix Road

Leander Road

Arlington Road

Brailsford Road

Dulwich Road

Half Moon Lane

Carver Road

Ruskin Walk

Village way

East Dulwich Grove (Village End only)

Gilkes Crescent

Calton Avenue

Townley Road

Dovercourt Road

Beauval Road

Landcroft Road

Rodwell Road

Heber Road

Cyrena Road

Crystal Palace Road

Landells RoadBarry Road

Underhill Road

Upland Road

Forest Hill Road

Dovedale Road

Shelbury Road

Scutari Road

Mundania Road

Homestall Road

A straight line from Honor Oak reservoir to Brixton pumping station would look something like the attached, but given the length, small changes north / south for the start / finish move the line a lot. And it seems that the tunnel didn't quite follow a straight line e.g. see fig 3 on page 20 of this, which shows the route meandering slightly as it passes under Brockwell Park https://spiral.imperial.ac.uk/bitstream/10044/1/14156/6/Quarterly%20Journal%20of%20Engineering%20Geology%20and%20Hydrogeology_46_2_2013.pdf

Apparently the tunnel was 4.85k long vs 4.68k as a straight line, so not far off.

Given the main is 45m deep and immensely strong, I don't really think there is anything to worry about, compared with more likely movement from clay shrinkage from nearby trees, general subsidence etc.

[edhistory]

If memory serves the main kink was northward at c2km to avoid the fault line.

The boreholes and seismic shocks were looking for Lambeth Group faeces and the East Dulwich earthquake fault.

The conclusion was that the earthquake fault runs under St Barnabas Church and then onward to Honor Oak.

John K

[edhistory]

Mike,

Thanks for the technical paper referencing "Green Rust" in the Lambeth Group.

Finally an explanation of the green stuff in the Dulwich Well excavation on the Green Man/Grove Tavern/ Harvester site:

https://archive.org/details/philtrans03150621

Join

[mikeb]

I fear we are now off topic, but I thought the bravery of Mr Cox's family in trying the 'water' was commendable, with "success" apparently being defined as "not dying". Maybe they were after a cure for 'Barrennefs':

https://books.google.co.uk/books?id=zY1hAAAAcAAJ&lpg=PA286&ots=wbLS1rNOHf&dq=%22dulwich%20waters%22&pg=PA286#v=onepage&q=%22dulwich%20waters%22&f=false

[edhistory]

We should all keep old back-ups.

I believe Route 2 was the final adopted route.

The kinks are at Herne Hill.

The fault lines are only shown west of the railway line.

Note the "interesting" LMB/LC boundaries.

John K

[edhistory]

Here is a large scale plan that shows the individual houses.

The thin line is the straight line.

The thick line is the actual line.

Anyone worried should contact Thames Water.

John K