2.
Response
to
Comments
2.9
Individual
Responses
to
Comments
from
Organizations
Northwest
wind,
this
photo
could
be
used
to
confirm
the
general
shape
and
extent
of
the
wind
speed
and
turbulence
measurements
made
for
the
existing
setting.
It
is
expected
that
Project
Site
development
will
cause
wind
speed
reductions
in
addition
to
those
wind
speed
reductions
that
now
result
from
the
shore
and
lands
to
the
west,
which
is
the
“wind
shadow”
close
to
the
shore
along
the
Baylands
site
that
is
cited
in
the
CPA
comment
letter
(see
Figure
15
in
Comment
Letter
CPA2).
However,
the
Draft
EIR
analysis
shows
primary
sailing
areas
further
from
the
shoreline
and,
hence,
less
affected
by
“wind
shadow
effects,”
as
not
adversely
impacted
by
Project
Site
development.
These
areas
were
considered
the
primary
sailing
area,
and
were
specified
as
described
32.
See
for
a
discussion
of
wind
tunnel
analysis
conducted
for
the
Draft
EIR.
The
wind
analysis
measured
the
effect
within
the
atmospheric
boundary
layer
that
would
result
from
a
change
in
surface
roughness
due
to
Project
Site
development
scenarios.
Relative
wind
speed
(R-Values)
and
Turbulence
Intensity
(TI)
accurately
characterize
a
change
in
the
flow
within
the
ABL
for
each
wind
direction.
Non-stationary
wind
conditions,
as
well
as
seasonal,
daily,
and
hour-by-hour
variations
in
wind
speed
and
turbulence
that
occur
in
the
sailing
area
are
larger
scale
phenomena
that
are
independent
of
the
small-scale
effects
of
the
Baylands
Site’s
surface
roughness,
although
all
are
affected
by
local
topographic
features,
such
as
Bay
View
Hill.
The
small-scale
wind
effects
of
increases
in
surface
roughness
due
to
adding
proposed
Project
Site
development
to
the
existing
Baylands
site
are
accurately
represented
by
the
changes
in
R-value
and
TI
presented
in
the
Draft
EIR
analysis.
Regardless
of
the
variable
speed
wind
conditions
that
exist
over
the
CPSRA
windsurfing
area,
the
R-value
results
determined
during
the
wind
tunnel
analysis
apply
uniformly
to
any
wind
speed
of
concern
over
the
CPSRA
windsurfing
area,
including
the
winds
observed
at
CPSRA.
A
detailed
explanation
of
the
R-value
is
included
on
Draft
EIR
page
4.M-12.
The
conversions
between
these
different
time
scales
are
well
understood
and
errors
are
easily
controlled.
The
time
scale
factor
between
the
wind
tunnel
and
full-scale
is
determined
from
the
ratio
of
length
scales
between
the
full-scale
and
model
divided
by
the
ratio
of
test
speeds
between
the
full-scale
and
model
testing.
The
scale
used
for
the
wind
analysis
was
1
inch
equals
50-foot
scale,
or
a
ratio
of
1:600.
Thus,
testing
a
40
mph
full-scale
mean
wind
speed
with
a
4
mph
reference
wind-tunnel
speed
would
yield
a
time
scale
factor
of
1:60,
indicating
that
1
second
measurement
in
the
wind
tunnel
would
represent
about
1
minute
measurement
in
full
scale
(real
time).
Brisbane
Baylands
Final
EIR
2.9.4-14
May
2015