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222
DRAINAGE MAP OF THE PARISH.
The attention of the Sanitary Committee having been
directed to the desirability of a map being prepared showing the
course, size, arid all other necessary particulars in respect of the
sewers in this parish, I took occasion, in my tenth monthly report
(October 18th) to refer to observations on the subject contained
in my Annual Report for 1875, wherein I specified a
Drainage Map as one of the Sanitary Wants of the Parish.
The Report was to the following effect:—
"It not unfrequently happens, when questions of drainage are
under consideration, that the want of a good map of the narish
showing the sewers is much felt, and I submit that it would be
a wise and judicious expenditure to set about the preparation
of such a map without delay, the wonderful growth of the
parish having made the ordnance survey obsolete for a large
portion of it. It would be desirable—
"1. To obtain the thirty sheets of the ordnance survey on which, wholly
or in part, the configuration of the parish is delineated, and to insert thereon all
streets, mews, etc., which have been formed since the said survey was taken :
"2. To show the system of sewers (as far as may be laid down from information
in possession of the Vestry, or procurable) to present date, with report,
indicating—
(a.) Sewers in good condition, date of construction, size, and length.
(b.) Sewers (or system of drainage) known to be inadequate to the requirements
of the respective localities, with description of same.
(c.) Sewers which, though possibly of sufficient capacity, may by reason of
old age or otherwise, e.g. by defective material, construction, or level,
be dangerous to the health of the locality.
(d.) Sewers which have blind ends, and which, by pipe connection with
other sewers, air shafts, or otherwise, might be ventilated.
(e.) Sewers difficult of approach from insufficient number of manholes, etc.
"Engineering experience would probably enlarge the scheme of such an
inquiry; but I venture to say that the advantages in a sanitary point of view of
such information as the above, followed up by execution of all necessary works,
would be simply incalculable. The parish once surveyed to date, it would be
easy, from time to time, to insert new streets and sewers, and we should thus have
ready access at all times to information which is in almost daily requisition in the
sanitary department."
The monthly report in question was referred to the
Sanitary Committee who recommended that the sewers should
be traced on the ordnance sheets for the use of my department.
The recommendation was adopted by your Vestry and the
work has been done.