►
Description
Scott Smedley, Chesterfield director of environmental engineering, presented a Swift Creek Reservoir and watershed update to the Board of Supervisors on February 23, 2022.
B
C
All
right
well.
That
concludes
my
presentation.
Thank
you
for
your
time
today,
good
afternoon
again,
mr
chair
members
of
the
board,
I'd
like
to
take
this
opportunity
to
kind
of
review
some
of
the
environmental
stewardship
aspects
of
specifically
the
swift
creek
watershed
with
some
of
the
upcoming
zoning
cases.
I
think
it's
important
to
talk
about
where
we've
been
over
the
last
couple
of
decades,
where
we
are
today
and
some
of
the
things
that
we
need
to
keep
in
place
and
keep
in
mind
as
we
move
forward.
C
We're
going
to
get
there
all
right,
so
you
know.
Roughly
20
years
ago
we
adopted
some
more
stringent
standards
for
the
upper
swift
creek
watershed.
One
of
those
was
to
have
an
increased
phosphorus
removal
requirement
for
new
development
projects,
and
this
mainly
pertained
to
residential
projects.
So
commercial
projects
still
met
the
state
standard,
but
residential
projects
had
to
meet
a
higher
threshold
of
phosphorus
removal.
C
Also,
all
projects
needed
to
have
enhanced
erosion
and
sediment
control
during
construction.
So
when
you
see
sediment
basins
on
a
construction
site
in
the
upper
swift,
creek
watershed,
they
have
to
be
25
percent
larger
so
that
we're
capturing
even
more
of
that
sediment
runoff
before
it
leaves
the
site,
also
supercelt
fence
or
an
equivalent
anionic
pam,
which
traps
more
sediment
and
also
flexible
growth
medium.
C
So,
if
you've
ever
seen,
hydro
seed
getting
sprayed
out
well,
it's
kind
of
like
a
hydro
seed
with
wood
fibers
in
it,
and
it
is
a
stronger
you
know,
hydroseed
product
and
it'll.
You
know
allow
vegetation
to
grow
more
rapidly.
Also
in
the
upper
swift
creek
watershed,
we
have
increased
setbacks
from
the
resource
protection
areas.
So
standard
setbacks
are
25
foot
all
across
the
county,
but
in
the
upper
swift
creek
watershed
we
have
a
35
foot
setback
requirement.
Mr.
B
B
A
C
C
Is
a
very
large
portion
of
the
county,
it's
one
of
the
fastest
growing
portions
of
the
county,
where
most
of
the
growth
is
okay.
Thank
you.
Also,
there
are
increased
floodplain
setback
requirements
so
for
properties
that
have
more
than
100
acres
draining
to
the
stream
behind
their
property.
We
have
a
35-foot
setback
as
compared
to
a
25-foot
setback,
so
these
increased
setbacks,
push
development
further
away
from
our
bodies
of
water,
reducing
the
risk
of
runoff
than
to
those
associated
drainage
ways.
C
C
Historical
archaeological
features
also
need
to
be
identified
so
that
all
needs
to
be
done
at
the
zoning
stage
rather
than
at
the
construction
plan
review
stage
so
outside
of
the
upper
swift
creek
watershed
in
the
other
areas
of
the
county.
Typically,
that's
all
done
once
a
plan
is
submitted
for
review,
but
in
the
episode
freak
watershed
we
want
those
things
identified
during
the
zoning.
C
You
all
may
recall,
and
I've
dealt
with
you
on
many
drainage
issues
within
your
districts-
that
the
county
maintains
all
residential
stormwater
facilities
bmps
in
the
county
in
the
upper
swift,
creek
watershed.
We
also
maintain
all
of
the
commercial
stormwater
facilities
currently
across
the
county.
We
have
about
560
stormwater
facilities
that
we
maintain
and
every
year
we're
adding
about
80
new
facilities
to
be
maintained
because
of
the
significant
amount
of
development
and
growth
within
the
county.
C
C
C
So
that's
some
of
the
you
know
background
related
to
criteria
for
development.
I
do
want
to
talk
about
the
actual
nutrient
and
water
quality
component.
So,
as
I
mentioned,
we
had
an
increased
phosphorus
removal
requirement
for
the
upper
swift,
creek
watershed
and
then
in
2014
we
had
a
change
in
the
stormwater
sector
and,
as
the
deq
representative,
mr
weimer
mentioned,
chesterfield
county
is
the
vsmp
authority.
You
might
remember
when
we
adopted
that
ordinance
and
we
you
know,
took
on
that
program
to
review
the
stormwater
plans
and
issue
those
construction
permits.
C
Do
the
inspections
and
so
the
difference
going
from
the
pre-2014
water
quality
removal
requirements
to
the
post.
2014
you
can
see
is
that
you're
treating
twice
the
amount
of
water.
So
you're,
going
from
a
half
an
inch
of
rainfall,
you're,
treating
just
from
the
impervious
areas
to
treating
one
inch
of
rainfall
over
the
entire
site,
so
you're
not
just
capturing
the
runoff
from
the
streets,
you're
capturing
the
runoff
from
the
managed
turf,
the
streets
any
associated.
C
You
know,
runoff
from
the
property
and
you're
treating
it
to
remove
the
phosphorus.
So
that's
a
big
plus
for
the
upper
surf
creek
watershed
because
you
might
remember,
I
said
we
weren't
treating
the
commercial
sites
to
a
higher
standard.
But
now
we
are
so
any
new
commercial
projects
that
have
occurred
since
2014
in
the
upper
swift
creek
watershed
have
to
meet
a
much
more
stringent
standard,
and
these
new
2014
stormwater
rags
are
on
par
with
our
previous
requirements.
C
For
the
phosphorus
removal.
The
engineers
doing
projects
in
the
upper
surf,
creek
watershed
for
residential
still
have
to
run
the
calculations
both
ways
but
most
of
the
time
they're
within
95
percent
of
each
other.
So
having
commercial
properties
and
industrial
properties
that
have
to
meet
this
stringent
standard
is,
is
pretty
significant
and
it's
more
protective
of
the
reservoir.
D
C
So
you
have
phosphorus
naturally
occurring
in
the
soils
and
it'll.
It
gets
bound
to
the
sediment
particles,
and
you
know
you
get
runoff.
You
know
in
that
way.
In
addition,
you
know
the
amount
of
residential
landscape
that
we
have
and
the
turf
management
aspect
of
you
know
personal
property
owners.
You
know
taking
care
of
their
lawns
lawn
care
companies
taking
care
of
you
know,
residential
properties.
C
The
industrial
properties
don't
quite
have
the
same
level
of
turf
management,
typically,
that
residential
properties
do
so
you're
not
going
to
see
you
know
the
same
level
or
the
high
levels
of
runoff.
Because
of
that,
but
you
know
you
could
see
you
know
other
products
getting
utilized.
You
also,
you
know,
do
get
sediment.
C
You
know
that
gets
accumulated
on
parking
lots
and
you
get
phosphorus
bound
to
that
sediment,
but
typically
you're
going
to
find
that
the
residential
lawns,
the
maintenance
of
those
is
going
to
have
higher
phosphorus
loads,
and
that
was
one
of
the
reasons.
The
way
the
ordinance
was
adopted
at
that
time,.
D
Yes,
sir,
so
parker
lines
pose
a
different
risk
right.
So
if
you
have
a
car,
for
example,
that
has
a
leak
oil
pan
or
a
leaky
gas
line
or
a
leaky
power
steering
fluid
or
any
other
fluid
for
that
matter,
and
that
stuff
actually
gets
in
the
parking
lot
when
it
rains
that
actually
washes
and
that's
a
different
issue
than
necessarily
the
phosphorus
stuff
and
the
bmps
we
put
in
place.
I'm
assuming
that
that
is
designed
also
to
kind
of
prevent
that
from
getting
in
a
water
supply.
C
So
if
we
see
a
project,
that's
going
to
have
a
higher
risk
of
petroleum
runoff,
you
some
of
you
may
remember
certain
proffers
that
we've
asked
for
that,
provide
some
biofiltration
or
binding
of
those
petroleum
products.
Typically,
we
don't
ask
for
those
type
of
things
on
standard
parking
lot
runoff.
But
you
are
correct.
You
know.
C
If
you
go
out
to
a
parking
lot,
storm
water
facility,
you,
you
know
more
likely
see
potential
of
a
sheen,
sometimes
in
those
areas
as
compared
to
going
into
a
residential
neighborhood
and
looking
at
a
stormwater
pond
you're,
going
to
see
a
more
significant,
green
algal
bloom
in
the
residential
neighborhood.
It's
comparative.
If
you
go
out
to
any
shopping
center
storm
water
facility,
you
were
highly
likely
to
to
find
something
like
that.
C
One
of
my
employees,
spouse
is
a
fisheries
and
wildlife
employee.
He
actually
goes
out
and
samples
and
shocks
and
you
know,
counts
the
fish,
so
it's
a
very
healthy
ecosystem
and
that's
a
benefit
to
all
the
residents
and
chesterfield
county.
So
the
criteria
as
to
how
this
health
is
measured
is
the
state
virginia
code
has
criteria
for
man-made
lakes
and
reservoirs,
and
specifically,
what
we're
looking
at
is
the
amount
of
chlorophyll
and
the
amount
of
phosphorus
in
the
reservoir.
C
If
the
reservoir
isn't
treated
with
algaecides
to
control
algae,
then
you
strictly
just
look
at
chlorophyll,
but
since
utility
departments
manages
the
reservoir
for
the
water
quality,
they
do
spot
treat
areas
in
the
reservoir
for
algal
blooms,
and
so,
as
such
phosphorus
is
included
in
that
and
phosphorus
becomes
your
dictating
criteria.
So
to
speak,
that
you
want
to
look
at,
and
the
utilities
department
has
done
an
excellent
job
over
the
years
of
you
know
with
their
monitoring
in
a
reservoir,
and
then
we
take
that
data
and
produce
an
annual
report.
C
C
C
We
have
protective
measures
put
in
place
and
we
still
have
excellent
water
quality
and
a
very
healthy
ecosystem,
and
that's
no
message
to
understate,
because
we
have
had
very
significant
growth
in
that
part
of
the
county,
and
I
think
it's
you
know
proven
that
the
measures
that
we
have
in
place
are
protective
of
water
quality
and
the
ecosystem
out
there.
I
also
will
mention
that
utilities
has
done
an
excellent
job
of
managing
hydrilla
in
the
reservoir.
C
You
know,
they've
managed
it
in
such
a
way
that
it's
you
know,
you're
not
seeing
vast
swings
in
water
quality
and
you're.
Not
seeing
vast
swings
in
the
vegetation,
the
natural
vegetation
aquatic
vegetation
and
you're,
not
seeing
you
know
massive
swings
in
the
fish
population,
so
it's
very
important
that
we
take
all
these
things
into
consideration.
C
C
Lastly,
for
mr
winslow
tree
canopy,
thank
you
so
much
my
my
annual
plug
for
as
you
look
at
zoning
cases
and
the
importance
of
planning
in
our
residential
neighborhoods
the
importance
of
tree
canopy
and
you
know,
and
livable
communities
aesthetically
pleasing
you
know.
Not
only
is
it
that,
but
from
a
stormwater
perspective,
these
tree
canopies
really
do
go
a
long
way
to
reducing
runoff
slowing
runoff
in
our
residential
communities.