2212 ORDINANCE No. 24 OF 1887.
obstruction
Public Health.
available
removed
, istant
aggradient
uniform
ranch
proper
ecause
pursue
flowing
; reater
course
would
behind
thirty
stream
would
below
eing
srain
would
nould
would
,there
thirty
easily
ith
Then
water
.1ihave
long
only
dfeet
afrom
long
give
more
clear
nrhe
feet
have
head
than
have
frominlet
1foot
then
feet
nd
CD
pipe
oue
that
all
CD
At
fect
60
C
ian
rnnd
nd
" all
one
1′8″CA .one
the
B 90
be
,bthe
a40
to
he
af224
D.
si1'4
C
fin ,oof
nix
adA
be
40
all
;D
B
an
be
,w
T
4
of
,30
of
tin
is
to
;oof
-60
at B
in
a
,i1It
B
b
it
is
it
w
'4
<2'6">[ V
tmomentum
cattained
ending
hrough
ertain
flatter
carry
have
pipe
.part
,awill
the
etween
ofon
to
it
aeet
nd
b,ffall
3B.
of
A
same
level
the
B.
at
as
uniform
given
1irain
main
were
AB nhen
46,6
fall
the
1IN
,tan
-d30
of
If
40
B
1
I N
100
'
06
B
60'
V
-40
'
31I0N
·>
6.g.
)(2.
Fallto drains 16. Whenever the gradient of any portion of a drain is less than one in thirty,
and flush.
the Sanitary Board may in its discretion require an automatic flush tank or any other
suitable contrivance for attaining an effective flush to be used.
Change of
direction. 17. All changes of direction in house- drains shall be made by means of properly
curved pipes or by half channels in manholes and between the points at which any
change of direction occurs all house-drains shall be laid in straight lines and regular
grades from point to point.
NOTE.—( Inasmuch as changes of direction are the points at which obstructions most frequently
occur, and for the purpose of removing obstructions generally, house-holders will do well to provide, at
each change of direction, a manhole, giving access to the drain. For this purpose the manhole should be
made 3′ 0″ × 1' 6" to the surface or to a depth of five feet above the drain. Beyond this depth the
manhole may be narrowed to l′ 6″ × 1′ 6″). But such manhole should not be found in cook-houses or in
places where they may be opened and used as receptacles for the disposal of solid rubbish.