lampshade1
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Thanks richieswan. In an earlier post lampshade1 estimated that the stormdrain pipe diameter on Benaroon is probably 375mm.
http://www.websleuths.com/forums/sh...12-Sept-2014-7/page32&p=11639912#post11639912
Also here is an image at the top end of the drive. There is a slotted kerb inlet and integral inspection cover for access to the stormdrain below. However there is also a silver coloured rectangle. I zoomed in on streetview and can see no lifting lugs so I don't think it is an inspection cover. It appears to have a pattern of longitudinal lines which suggests it may be a metal grille? I think it is possible this may be the grille top of an inlet where possibly a small intermittent creek may enter the upper point of the stormwater pipe. If so then the stormwater drain possibly drains not only the street, but also water from the undeveloped land above,
The pipe at the high end of Benaroon Drive (where your streetview pic is) is likely at least 375mm diamater as that is the minimum size that tends to be used for a pipe under a road in NSW. The pipe could be larger dependent upon the upstream catchment although I expect i would be only 375mm diameter until at least the bottom of the Benaroon Drive hill (house number 43). I'm not familiar with the rainfall patterns of Kendall though (which is part of sizing the stormwater system for an area).
It could be a 'grated surcharge pit' which has the grate set up on legs about 100mm high. This allows debris to enter the pit and not block the grate.