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"The water will be pumped thence through a 40-in. diameter
main, about 650 yards in length, to a Sedimentation Reservoir,
and will flow by gravity from the reservoir, through a 40-in. diameter
main about 400 yards in length, to the Primary Filters, where a
preliminary process of rapid filtration will ensue. A by-pass main
will be provided around the reservoir to allow of the water being
pumped direct from the Low Lift Station to the Primary Filters if
required.
" Alter leaving the Primary Filters, the water will flow (by
gravity) to six sand filter beds of the ordinary type, and after being
again filtered and chlorinated, will pass into the Filtered Water
Reservoir. An outlet main of 40-in. diameter will carry the water
from the latter reservoir to the suction branches of the three sets of
pumping plant situated at the Langham High Lift Pumping
Station.
"The water will then be pumped through a main, 32 inches in
diameter and slightly over 14 miles in length, into a covered reservoir
placed in close proximity to the Tiptree Pumping Station, from
which it will be carried to the suction branches of the three
pumping units by a short length of main of 36-in. diameter.
"TheTiptree Pumping Plant will pump the water thus received,
through a main of 32-in. diameter and 94 miles in length, to the Danbury
Reservoir, the top water level of which will be about 358 O.D.
"From the latter reservoir, thewaterwill flow by gravity through
a main of 34-in. diameter and about 13J miles in length to the
Company's Herongate Reservoir, from which it will be supplied to
the Company's District.
" The whole of the mains will bo constructed of steel coated
internally with a bitumen lining applied centrifugally."
25. RIVERS AND STREAMS.
The various rivers and streams that run through the area are
controlled by the Essex Sewers Commissioners, whilst of course,