In response to a post yesterday about the old council depot on Wightman Road (opposite Effingham), I posted an outline of the building's history. Walking past today, I called in to see if I could verify a couple of my assumptions.
I was also delighted to discover a manhole cover which I'm pretty sure covers the culverted Stonebridge Brook. You can still hear the brook flowing below - and no, it's not a sewer!
Are you sure it goes through Chestnuts Park, and doesn't just follow a route along St Ann's Road and Blackboy Lane?
The Google Streetview image below shows Clarence Road between Blackboy Lane and the junction with Falmer Road in 2008 during roadworks - a couple of manholes nearby are marked "foul" in red paint, while this one is marked "Sto..."
More on that in the comments on this thread.
Gosh, great sleuthing. Clearly that's going to be an interesting drain cover to raise and investigate - and certainly some authority does know where the Stonebridge is, if the blue lettering is STO for Stonebridge, which seems likely, and the arrows face the Eastward flow direction. The January culvert survey discovered a parallel culvert right near the North end of the park which seemed to have the culvert in. This could well continue north into Clarence Rd, then turn eastwards. All is still to be discovered!
Is it linked to the noisy water/drain cover on the junction of Cranliegh & Etherley Roads?
Apparently not. We lifted and filmed the water under that drain cover, and the misconnections officer said he was sure from the shape of the cover in our video that it was a sewer running under there. But when the feasibility project starts, all these drain covers can be lifted, and cameras sent down etc. Will keep you all posted here. I'm still not sure about that drain cover - the water below is so constant, fast flowing and noisy, and certainly did not smell sewer like.
Fascinating pictures in the other thread. I've always thought (based only on passing it so many times) that the brook ran along the noticeable dip cutting through the north-west corner, where the grass also grew greener and deeper. That would seem to correlate with the angle of the bricked course you've glimpsed.
Glad you mentioned this drain cover. I have never known it to smell nasty which leads me to wonder whether it is not a sewer!