14
31
January
2003
The
flow
values
used
in
this
calculation
have
been
weighted
(
weighted
flow
=
average
daily
flow
*
weight)
using
the
same
facility
weights
applied
in
the
cost
analysis.
The
purpose
of
this
weighting
is
to
calculate
costs
and
benefits
for
all
551
in­
scope
facilities,
based
on
surveys
received
from
540
facilities.

The
regional
analyses
incorporated
data
for
many
more
facilities
than
were
evaluated
for
proposal,
and
thus
improved
the
basis
for
EPA's
national
benefits
estimates.

Development
of
Regional
and
National
Benefits
Estimates
EPA
considered
the
following
benefit
categories
in
its
regional
and
national
benefits
analyses:
recreational
fishing
benefits,
commercial
fishing
benefits,
and
nonuse
benefits.
Nonuse
benefits
include
benefits
from
reduced
I&
E
of
forage
species,
threatened
and
endangered
species,
and
the
non­
landed
portion
of
commercial
and
recreational.
The
analysis
of
direct
use
benefits
for
each
region
includes
estimating
benefits
to
recreational
anglers
from
improved
fishing
opportunities
due
to
reduced
impingement
and
entrainment
based
on
a
region­
specific
valuation
function
and
estimating
benefits
from
improved
commercial
fishery
yield.
Details
of
the
commercial
fishery
benefits
methods
are
provided
in
Chapter
A9
of
Part
A
of
the
§
316(
b)

Phase
II
Case
Study
Document
and
in
the
document
entitled
"
Methods
Used
to
Estimate
Commercial
Fishing
Benefits"
that
accompanies
this
NODA.
Details
of
the
recreational
fishery
benefits
methodology
is
provided
in
Chapter
A10
of
Part
A
of
the
§
316(
b)
Phase
II
Case
Study
Document
and
in
the
document
titled
Chapter
A13:
Methods
for
Estimating
Commercial
Fishing
Benefits
accompanies
this
NODA.
Details
of
the
nonuse
benefits
analysis
are
provided
in
Part
E
of
Section
X
of
the
NODA.
