Talk:Bollo Brook
Bollo Brook is part of the Stamford Brook system of streams. Although the Wikipedia page is a bit dubious in places, it seems it did flow East from Chiswick to join Stamford Brook.
There's lots of material stating that a) it was also the western boundary of Chiswick House at one point, b) that it was excavated in Chiswick House to make the lake there (called the Canal) c) that it caused pollution (because of carrying the results of laundry in Acton upstream and no longer fed the lake. In fact you can see a pipe in the lake which it is claimed carries the Bollo Brook, but the lake is fed from the Thames by a sluice gate at high tide.
Plenty of research to do, but how the Bollo Brook got from the junction of Bollo Lane and Acton Lane to Chiswick House seems to me to be in question. In any case it seems that it did also join Stamford Brook, maybe at the eastern end of Chiswick Back Common / Acton Green.