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39
constructed a new Sewer for the use of their own district,
and then most of the houses in the parish of Christ Church
were disconnected from the old boundary Sewers, but the
works of the Oil Refinery were still left to drain into the
Boundary Sewer.
The entrance of a shaft in Commercial Road, usually closed
and hidden beneath the granite paving of the carriage way,
marks the place where the channel of Broad wall Sewer attains
its highest level, and indicates the point where Broadwall
Sewer merges into continuity with that of Commercial Road.
Sewage entering the Sewer from inlets on the western side
of the shaft is conducted by the trend of the channel in a
westerly direction towards Cornwall Road; while sewage
entering on the eastern side is conducted in an easterly and
southerly direction towards Stamford Street. From this
arrangement of gradients it will be observed that no sewage
entering the Sewer from inlets on the western side of the
shaft finds its way into the Broadwall channel.*
As the disused shaft in Commercial Road marks the
highest point or summit of the channel, so a side entrance
approached from a manhole in Stamford Street marks the
lowest point or outlet. This manhole, furnished with a
hinged cover and open grating, provides the only ordinary
means of access to Broadwall Sewer.
Between summit and outlet the channel, like that of all old
sewers, follows an irregular course. A few yards from the
summit the whole tube of the Sewer is changed in level. This
part of the channel is called The Drop, The channel
follows a course two feet below its former level. For a distance
of 18 feet, where the channel passes beneath the shaft of a
closed manhole, this level is maintained without any significant
variation. From this point it takes a southerly direction
* Vide plan, page 41.