Document ID: EPA-HQ-OW-2004-0002-0116
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2004-11-23T05:00Z

memorandum
Date:
May
20,
2004
Subject:
Review
of
Medium
Design
Flow
Phase
III
Facilities
(
100
to
250
mgd)
For
Hydropower
Water
Use
and
Confirmation
That
Cooling
Water
Component
is
Greater
Than
25%

This
memo
is
a
follow
up
to
my
May
13,
2004
memo.
Both
memos
summarized
the
results
of
reviewing
the
survey
responses
of
facilities
with
high
design
influent
flows
(
DIF)
with
the
May
13
memo
covering
Phase
III
facilities
with
DIFs
greater
than
250
mgd
and
this
memo
covering
Phase
III
facilities
with
DIFs
ranging
from
100
to
250
mgd.
The
surveys
were
reviewed
to
determine
whether
any
of
them
utilize
all
or
a
portion
of
the
flow
for
hydropower
generation
and
to
confirm
their
in­
scope
status
with
respect
to
whether
the
cooling
water
component
was
25%
or
greater.
Both
the
Phase
III
universe
and
design
intake
flow
(
DIF)
databases
from
October
29,
2003
and
a
more
recent
version
from
May
14,
2004
were
used.
Note
that
the
more
recent
database
did
not
include
facilities
[
names
removed
for
CBI]
but
were
still
included
in
this
analysis.
The
database
notes
that
these
incomplete
survey
facilities
had
been
removed
on
November
21,2003.
For
all
facilities
with
DIF
flows
from
100
to
250
mgd,
the
answers
to
the
survey
technical
questions
concerning
flow
and
cooling
water
components
were
obtained
and
compared
with
the
flow
schematics
for
water
use.
The
table
below
summarizes
the
results.
In
reviewing
the
25%
cooling
water
criterion,
if
the
aggregate
response
to
Q3(
h)
was
not
>
25%,
then
the
flow
diagram
and
average
intake
flow
data
(
Q25)
were
checked
to
see
if
it
was
apparent
that
Q3(
h)
was
based
on
the
DIF
and
that
low
values
reflect
underutilization
of
the
intake
capacity.
Where
the
cooling
component
was
<
25%
of
DIF
but
>
25%
of
the
average
intake
flow
(
AIF)
are
so
noted.
The
table
also
identifies
any
instances
where
cooling
water
reuse
may
impact
the
determination
of
%
cooling
water
use.
Note
none
of
the
Phase
III
facilities
in
the
100
to
250
mgd
range
use
intake
water
for
hydropower
purposes.

[
Table
deleted
for
CBI
reasons]