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35.
it is, to attacks of sore throat or other septic
affections, the explanation may be found in the
liability of drain air, unlike sewer air, to carry in
suspension large numbers of microbes of sewage
origin (pars. 78 to 97, and 112). It is desirable,
therefore, that the possibility of splashing should
be taken into account in the construction of drains,
in order that it may be reduced to a minimum."
Inspection Chambers.
Following the Departmental Committee's report on
Intercepting Traps etc., whenever in the course of examination
of drains, inspection chambers are found where undue
splashing occurs, Owners are asked to have them altered in
the following manner to remedy the nuisance:—
(a) When the benchings are level with the top edge of the
channel pipe, the sewage, coming from branch drains, runs
over the benching and remains there for some time before
finally being washed back into the main drain. In such
cases, the benching is raised and brought up straight for
about six inches, so that sewage, coming from side connections,
impinges against the flat surface and is directed
towards the flow in the main drain.
(b) In the case of branch connections discharging into the
main channel at right angles, or even in a slightly opposite
direction to the flow of the drain, proper section bends are
provided, so that the sewage is discharged into the main
drain, in the direction of the flow.
(c) The greatest amount of splashing is caused by sewage,
which is conveyed by pipes, that discharge some distance
above the main channel through the walls of inspection
chambers. To relay the length of drain, that discharges in
this manner, would be expensive ; the method recommended
is to connect pipes to the existing outlet and take them
down the wall of the chamber, with a section bend at the
foot, to discharge in the direction of the flow,