please empty your brain below
There's an overflow at Priest's Bridge (I think it can be seen from the Bridge, there's photos somewhere on the web) and, according to the Barnes Common link, a second one further on. These take most of the water from the Beverley. In dry weather, the outlet into the Thames is often just a trickle - less than that which flows from the Pyl Brook.
Having dug around a bit, I see that the second oveflow is at Westfields Sluice. This is the weir etc. where the Beverley bends round at the top North West corner of the pond. I assume that the culvert then runs in a straight line along the vertical (on the map) side of Westfields, under the school, and then under Long Walk. If so, then I assume that at some point it ends up running under Elm Bank Gardens as the outlet is at the end of Elm Bank Gardens nearest Barnes Bridge.
According to the Friends link, the overflow from Priests Bridge runs in cut and cover under White Hart Lane to the Thames.
The culvert goes under the new block of flats(?) at the river side. The spillways for both outlets can be clearly seen in the mud at low tide on Google Earth.
[Priests Bridge overflow photo]
Go to the Barnes area on this map. The weir is marked, and the semicircular area in the Beverley above the "G" at Priests Bridge is the overflow entrance.
"The Beverley Brook natural channel only takes 20% of the flow during normal flow rates"
That would account for why there is only a trickle by the time it reaches the Thames on the Putney side
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