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...
Inlet
...
Channel
...
Design
...
Program
...
The
...
purpose
...
of
...
the
...
inlet
...
channel
...
program
...
is
...
to
...
determine
...
the
...
dimensions
...
of
...
the
...
inlet
...
channel,
...
the
...
dimensions
...
of
...
circular
...
ports
...
in
...
the
...
inlet
...
chimneys
...
that
...
deliver
...
water
...
from
...
the
...
inlet
...
channel
...
into
...
the
...
sedimentation
...
tank,
...
and
...
the
...
dimensions
...
of
...
the
...
weir
...
in
...
the
...
inlet
...
channel
...
that
...
will
...
regulate
...
the
...
height
...
of
...
the
...
water
...
in
...
the
...
inlet
...
channel
...
and
...
flocculator.
...
The
...
inlet
...
channel
...
will
...
run
...
along
...
the
...
inlet
...
end
...
of
...
the
...
sedimentation
...
tanks,
...
such
...
that
...
its
...
length
...
will
...
be
...
equal
...
to
...
the
...
combined
...
widths
...
of
...
all
...
the
...
sedimentation
...
tanks
...
plus
...
the
...
thickness
...
of
...
the
...
walls
...
between
...
the
...
tanks
...
and
...
the
...
thickness
...
of
...
the
...
walls
...
that
...
separate
...
the
...
bays
...
within
...
the
...
sedimentation
...
tank
...
channels.
...
The
...
Inlet
...
Channel
...
Weir
...
The
...
purpose
...
if
...
the
...
inlet
...
weir
...
is
...
to
...
regulate
...
the
...
height
...
of
...
water
...
in
...
the
...
inlet
...
channel
...
and
...
flocculator.
...
This
...
is
...
accomplished
...
by
...
a
...
relation
...
between
...
the
...
width
...
of
...
the
...
weir
...
and
...
the
...
head
...
loss
...
over
...
the
...
weir,
...
which
...
is
...
governed
...
by
...
the
...
equation:
| Wiki Markup |
|---|
{latex} \large $$ W = {3 \over 2}{Q \over {K_{VC} \sqrt {2g} H^{{3 \over 2}} }} $$ {latex} |
Where
...
W
...
is
...
the
...
width
...
of
...
the
...
weir
...
and
...
H
...
is
...
the
...
head
...
loss
...
over
...
the
...
weir.
...
The
...
weir
...
can
...
either
...
be
...
placed
...
parallel
...
or
...
perpendicular
...
to
...
the
...
length
...
of
...
the
...
channel.
...
Parallel
...
Weir
...
The
...
parallel
...
weir
...
will
...
be
...
placed
...
in
...
the
...
inlet
...
channel
...
such
...
that
...
it
...
will
...
satisfy
...
two
...
constraints.
...
First
...
that
...
on
...
the
...
side
...
of
...
the
...
weir
...
that
...
delivers
...
water
...
to
...
the
...
inlet
...
chimneys,
...
the
...
width
...
of
...
the
...
channel
...
will
...
be
...
wide
...
enough
...
so
...
that
...
the
...
energy
...
dissipation
...
rate
...
associated
...
with
...
the
...
channel
...
geometry
...
will
...
be
...
greater
...
than
...
the
...
energy
...
dissipation
...
rate
...
at
...
the
...
end
...
of
...
the
...
flocculator
...
and
...
will
...
also
...
be
...
wide
...
enough
...
to
...
fit
...
the
...
ports
...
leading
...
to
...
the
...
inlet
...
chimneys
...
plus
...
an
...
additional
...
3
...
cm
...
of
...
space
...
on
...
each
...
side
...
of
...
the
...
port.
...
The
...
second
...
constraint
...
for
...
placing
...
the
...
weir
...
will
...
be
...
that
...
on
...
the
...
side
...
of
...
the
...
weir
...
that
...
delivers
...
water
...
to
...
waste,
...
the
...
channel
...
will
...
be
...
wide
...
enough
...
to
...
handle
...
the
...
flow
...
of
...
water
...
in
...
the
...
event
...
that
...
all
...
sedimentation
...
tanks
...
are
...
shut
...
off
...
and
...
all
...
of
...
the
...
water
...
coming
...
from
...
the
...
flocculator
...
must
...
go
...
to
...
waste;
...
it
...
must
...
be
...
able
...
to
...
handle
...
the
...
entire
...
flow
...
of
...
the
...
plant.
...
Perpendicular
...
Weir
...
The
...
perpendicular
...
weir
...
design
...
is
...
placed
...
inside
...
the
...
inlet
...
channel
...
such
...
that
...
the
...
energy
...
dissipation
...
rate
...
associated
...
with
...
the
...
inlet
...
chimneys
...
will
...
be
...
much
...
greater
...
than
...
the
...
energy
...
dissipation
...
rate
...
in
...
the
...
open
...
inlet
...
channel.
...
A
...
perpendicular
...
weir
...
also
...
must
...
be
...
placed
...
so
...
that
...
it
...
can
...
handle
...
the
...
entire
...
flow
...
of
...
the
...
plant
...
if
...
all
...
the
...
sedimentation
...
tanks
...
are
...
turned
...
off
...
and
...
all
...
water
...
is
...
going
...
to
...
waste.
| Wiki Markup |
|---|
\\ \\ {float:left|border=2px solid black} [!RenderedInlet.png|width=500px!|InletSide.bmp] {float} \\ \\ \\ \\ |
| Wiki Markup |
|---|
{float:left|border=2px solid black}
[!InletTop.png|width=500px!|InletSide.bmp]
{float}
\\ |
| Wiki Markup |
|---|
\\ \\ \\ {float:left|border=2px solid black} [!InletFront.png|width=500px!|InletSide.bmp] {float} \\ \\ h2. |
Inlet Channel Design Algorithm
Algorithm
The length of the channel is a function of the number of sedimentation tanks, and the thickness of the walls between the sedimentation tanks.
| Wiki Markup |
|---|
Inlet Channel Design Algorithm [Inlet Channel AutoCAD Drawing|AutoCAD Channel Program] h3. Algorithm The length of the channel is a function of the number of sedimentation tanks, and the thickness of the walls between the sedimentation tanks. {latex} \large $$ L_{Channel} = (N_{SedTanks} )(W_{Sed} ) + (N_{SedTanks} + 1)(T_{PlantWall} ) $$ {latex} |
The
...
cross
...
sectional
...
area
...
of
...
the
...
inlet
...
channel
...
on
...
the
...
side
...
of
...
the
...
weir
...
that
...
delivers
...
water
...
to
...
the
...
inlet
...
chimneys
...
is
...
determined
...
using
...
the
...
A.Port
...
function
...
in
...
| Wiki Markup |
|---|
Functions|Fluids Functions Design Program] {latex} \large $$ A_{InletChannel} = A_{Port} (Pi_{FlocDissipation} ,K_{LTurn90} ,Q_{Plant} ,ED_{SedInlet} ,Pi_{VenaContractaOrifice} ) $$ {latex} |
Therefore
...
the
...
height
...
of
...
the
...
water
...
in
...
the
...
inlet
...
channel
...
is
...
equal
...
to
...
the
...
square
...
root
...
of
...
the
...
area
...
of
...
the
...
channel.
| Wiki Markup |
|---|
{latex} \large $$ HW_{InletChannel} = \sqrt {A_{InletChannel} } $$ {latex} |
The
...
first
...
constraint
...
for
...
the
...
width
...
of
...
the
...
inlet
...
channel
...
on
...
the
...
side
...
of
...
the
...
weir
...
that
...
delivers
...
water
...
to
...
the
...
chimneys
...
is
...
to
...
consider
...
the
...
energy
...
dissipation
...
rate.
...
The
...
area
...
of
...
the
...
inlet
...
channel
...
and
...
the
...
height
...
of
...
the
...
water
...
in
...
the
...
channel
...
have
...
already
...
been
...
calculated,
...
and
...
so
...
the
...
width
...
may
...
be
...
determined:
| Wiki Markup |
|---|
{latex} \large $$ W_{InletChannelED} = {{A_{InletChannel} } \over {HW_{InletChannel} }} $$ {latex} |
Next
...
the
...
size
...
of
...
the
...
ports
...
that
...
take
...
the
...
flocculated
...
water
...
down
...
into
...
the
...
inlet
...
chimneys
...
and
...
to
...
the
...
sedimentation
...
ports
...
is
...
calculated
...
through
...
the
...
A.Port
...
function
...
in
...
...
| Wiki Markup |
|---|
Design Program]. {latex} \large $$ A_{SedManifoldEntrance} = A_{Port} (Pi_{FlocDissipation} ,K_{PipeEnt} ,Q_{SedManifold} ,ED_{SedInlet} ,Pi_{VenaContractaOrifice} ) $$ {latex} |
The
...
diameter
...
of
...
the
...
hole
...
that
...
delivers
...
the
...
water
...
from
...
the
...
inlet
...
channel
...
into
...
the
...
inlet
...
chimneys
...
is
...
calculated
...
using
...
an
...
array
...
that
...
loops
...
through
...
the
...
available
...
pipe
...
size
...
diameters
...
and
...
rounds
...
the
...
needed
...
diameter
...
up
...
to
...
the
...
next
...
available
...
diameter
...
through
...
the
...
function
...
found
...
in
...
the
...
...
| Wiki Markup |
|---|
|Pipe Database Design Program]. {latex} \large $$ {D_{SedChimneyPipe}} = {D_{pipelarger}}\left( {2\sqrt {{{{A_{SedManifoldEntrance}}} \over \pi }} ,\left. {{D_{Pipesizes}}} \right)} \right. $$ {latex} |
The
...
circular
...
hole
...
through
...
the
...
inlet
...
chimneys
...
must
...
have
...
at
...
least
...
3
...
cm
...
of
...
space
...
around
...
it,
...
and
...
so
...
the
...
second
...
constraint
...
on
...
the
...
width
...
of
...
the
...
inlet
...
channel
...
on
...
the
...
side
...
of
...
the
...
weir
...
that
...
delivers
...
the
...
water
...
to
...
the
...
chimneys
...
is
...
that
...
it
...
must
...
be
...
at
...
least
...
as
...
wide
...
as
...
the
...
diameter
...
of
...
this
...
port,
...
plus
...
the
...
3
...
cm
...
of
...
space
...
needed
...
on
...
each
...
side
...
of
...
the
...
port.
...
Therefore
...
the
...
width
...
of
...
the
...
inlet
...
channel
...
on
...
the
...
side
...
of
...
the
...
weir
...
delivering
...
water
...
to
...
the
...
chimneys
...
is
...
set
...
to
...
be
...
the
...
maximum
...
of
...
the
...
width
...
determined
...
by
...
the
...
allowable
...
energy
...
dissipation
...
in
...
the
...
inlet
...
channel,
...
and
...
the
...
width
...
needed
...
by
...
the
...
circular
...
port
...
in
...
the
...
inlet
...
chimney.
| Wiki Markup |
|---|
{latex} \large $$ {W_{InletChannelEst}} = \max \left( {{W_{InletChannelED}},\left. {{D_{SedChimneyPipe}} + 2{S_{SedInletChannelMin}}} \right)} \right. $$ {latex} |
The
...
height
...
of
...
the
...
inlet
...
channel
...
is
...
equal
...
to
...
the
...
water
...
height
...
in
...
the
...
inlet
...
channel
...
plus
...
the
...
plant
...
freeboard
...
height,
...
so
...
that
...
the
...
water
...
is
...
not
...
at
...
the
...
very
...
top
...
of
...
the
...
channel.
| Wiki Markup |
|---|
{latex} \large $$ H_{InletChannel} = HW_{InletChannel} + H_{PlantFreeboard} $$ {latex} |
As
...
mentioned
...
earlier,
...
the
...
inlet
...
channel
...
weir
...
will
...
serve
...
to
...
regulate
...
the
...
height
...
of
...
the
...
water
...
in
...
the
...
inlet
...
channel.
...
On
...
one
...
side
...
of
...
the
...
weir,
...
the
...
water
...
is
...
being
...
delivered
...
to
...
the
...
inlet
...
chimneys.
...
On
...
the
...
other
...
side
...
of
...
the
...
weir,
...
water
...
will
...
go
...
to
...
waste
...
when
...
the
...
sedimentation
...
tanks
...
are
...
shut
...
off.
...
The
...
width
...
of
...
this
...
side
...
of
...
the
...
weir
...
is
...
determined
...
to
...
be
...
able
...
to
...
handle
...
the
...
flow
...
in
...
the
...
case
...
that
...
all
...
of
...
the
...
sedimentation
...
tanks
...
are
...
shut
...
off
...
and
...
all
...
of
...
the
...
water
...
must
...
go
...
to
...
waste;
...
it
...
must
...
be
...
able
...
to
...
handle
...
the
...
entire
...
flow
...
rate
...
of
...
the
...
plant.
...
To
...
do
...
this,
...
the
...
inlet
...
channel
...
must
...
have
...
a
...
width
...
that
...
will
...
yield
...
a
...
desired
...
head
...
loss.
...
Taking
...
advantage
...
of
...
the
...
fact
...
that
...
head
...
loss
...
is
...
proportional
...
to
...
the
...
width
...
of
...
the
...
channel,
...
the
...
width
...
of
...
the
...
inlet
...
channel
...
on
...
the
...
side
...
of
...
the
...
weir
...
that
...
delivers
...
water
...
to
...
waste
...
is
...
determined
...
through
...
an
...
iterative
...
solution
...
that
...
compares
...
the
...
channels
...
width
...
and
...
calculated
...
head
...
loss
...
to
...
a
...
target
...
head
...
loss
...
and
...
then
...
adjusts
...
the
...
width
...
until
...
the
...
target
...
head
...
loss
...
is
...
reached.
...
This
...
algorithm
...
can
...
be
...
found
...
in
...
...
| Wiki Markup |
|---|
|Fluids Functions Design Program]. {latex} \large $$ W_{InletChannelWaste} = w_{channel\min HL} (H_{SedWeirInlet} ,H_{SedWeirInlet} ,Q_{Plant} ,L_{Channel} ,Nu_{Water} ,E_{Concrete} ,1,HL_{SedWeir} ) $$ {latex} |
The
...
width
...
of
...
the
...
entire
...
inlet
...
channel
...
is
...
now
...
the
...
sum
...
of
...
the
...
width
...
of
...
the
...
channel
...
delivering
...
water
...
to
...
the
...
inlet
...
chimneys,
...
the
...
thickness
...
of
...
the
...
weir,
...
and
...
the
...
width
...
of
...
the
...
channel
...
delivering
...
water
...
to
...
waste:
| Wiki Markup |
|---|
{latex} \large $$ W_{InletChannel} = W_{InletChannelEst} + T_{SedWeir} + W_{InletChannelWaste} $$ {latex} h3. |
Stopping
...
the
...
Flow
...
of
...
Water
...
into
...
the
...
Sedimentation
...
Tank
...
The
...
inlet
...
chimneys
...
carry
...
water
...
from
...
the
...
inlet
...
channel
...
into
...
the
...
bottom
...
of
...
the
...
sedimentation
...
tank.
...
However,
...
sometimes
...
it
...
is
...
necessary
...
to
...
shut
...
off
...
the
...
flow
...
of
...
water
...
into
...
a
...
sedimentation
...
tank
...
in
...
order
...
to
...
clean
...
it,
...
make
...
repairs,
...
or
...
to
...
close
...
it
...
off
...
if
...
the
...
plant
...
is
...
producing
...
an
...
excess
...
of
...
clean
...
water.
...
For
...
this
...
purpose,
...
control
...
pieces
...
are
...
needed
...
to
...
stop
...
the
...
flow
...
of
...
water
...
into
...
the
...
chimneys.
...
Individual
...
control
...
pieces
...
for
...
each
...
chimney
...
are
...
advantageous
...
because
...
a
...
particular
...
sedimentation
...
tank
...
can
...
be
...
shut
...
off
...
while
...
still
...
allowing
...
the
...
rest
...
of
...
the
...
plant
...
to
...
function
...
normally.
...
The
...
control
...
piece
...
consists
...
of
...
three
...
parts:
...
1.
...
A
...
PVC
...
pipe
...
to
...
fit
...
into
...
the
...
coupling
...
of
...
the
...
inlet
...
chimney
...
2.
...
A
...
cap
...
to
...
cover
...
the
...
top
...
of
...
the
...
PVC
...
pipe
...
3.
...
A
...
thin,
...
long
...
tube
...
that
...
comes
...
out
...
of
...
the
...
cap
...
and
...
extends
...
above
...
the
...
height
...
of
...
the
...
water
...
in
...
the
...
inlet
...
channel
...
to
...
allow
...
air
...
to
...
escape
The constraint for designing this control piece is the diameter of the coupling in the inlet chimney, which is derived from the variable D.SedChimneyPipe, the diameter of the chimney itself. With this variable, and using the information in the pipe database that specifies PVC coupling and cap sizes for a particular PVC pipe size, the dimensions of the rest of parts (1) and (2) of the control piece are determined. The specifications for the long tube are that it is less than 1 inch in diameter and that its height extends above the height of the water in the inlet channel (HW.InletChannel),
...
so
...
that
...
air
...
can
...
flow
...
out
...
of
...
it,
...
and
...
it
...
is
...
easy
...
to
...
pull
...
out.
These chimney plugs are one half of the control pieces being designed to allow for the shutting off and re-filling of a sedimentation tank.