Henry C. Adams
Capitolo 42
systems of old sewers that the quantity of water of infiltration can be
verified by gauging the evening flow; and if it is it tried to
an accurate examination of the course of the sewers is excessive
you/he/she should be done with a sight to locating the places where the
the greatest part of the loss happens, and then to take such footsteps
as you/he/she can be practicable to reduce the quantity.
CHAPTER YOU.
GAUGING FLOW IN SEWERS.
A method adopted to indicative of level that the flow of the sewage is frequently
to mend an axle of dam with an only rectangular incision through the
provides of sewers in a convenient road trap door that will stagnate on the sewage;
and then to verify the depth of water that passes on the incision
from measurements from the water's surface to a peg mended
you level with the fund of the incision and to a distance of two or
three feet street on the countercurrent the side. The extreme variation in
the flow of the sewage is so great, however, that if the incision
it is of a convenient ampleness to take the flow of maximum, the schedule
variation to the duration of least flow will strike the depth of
the sewage on the incision to such small extension that the difficulty
you/he/she can be experimented in to take the readings with enough
the accuracy to show such variations in the flow, and there will be
the great probability of incorrect results that is gotten by reason
of solid matter of sewage that lodges on the incision. When the depth on
a l2 in incision is approximately 6 in, a variation of only 1-16 thumb in
the vertical measurement will represent a difference in the
percentage of the flow of approximately 405 braids for now, or
approximately 9,700 braids a day. When the flow is on deep lin
the same variation of 1-16 in it will approximately represent 162
braids for now, or 3,900 braids per diem. Greater accuracy
you/he/she will be gotten if a pond of properly-formed gauging is
independently built of the road trap door and a double
rectangular incision, similar to Fig tree. 13 or a triangular or V-
moulded incision, as shown in Fig tree. 14, used to the place of the simplest