JKEARNEY
NOTES
SHC 321
,Sewerconnections
Higher elevation
Soffit
- Lower elevation .
rt we connect the drain invert to
sewer soffit
•
.
Invert .
¥ .
Aiowsmooemert of
waste .
⑧
Manhole
guideline Smallest size for people
→
: 750mm .
Networkeleohents
Go
regulations
↳ see .
' 00 -
Isom * NB : Manholes have a
# Change in
Manhole , #
in vertical
horizontal
alignment 50mm drop .
alignment
→
↳ change in
Changes pipe size .
Different pipe heights @ manhole : inlet & outlet .
HDPE we can weld them : less
leakage
-
.
↳ Use when dolomite present .
Readingofcontours.se#werpipes :
on
:÷¥¥÷÷:÷÷÷±÷:
water pipes placed on
high side .
Sewers
placed on
low side
, * Ips in a sewer network .
Design-flowcakulationso.tt
Average daily
DF -
flow
Attenuation
"
filled
capacity
'
:
storage of a semi -
pipe .
✓
Attenuation :
←
Minimum diameter 100mm
sewer
pipe
Maximum
velocity 2,5mA
=
.
"
of
"
Level drop 50mm inside manholes .
:X
v_
y
I x-p
→ +
}
&
0
#I cover .
minimum
gradient .
When the cover is too little
we can increase the
gradient .
There should be
*
surface le always
)
1,4M Cover ( Between
pipe
