Stormwater Management Report
24
The Bathla Group Pty Ltd Stormwater Management Report 47-67 Rooty Hill Road North, Rooty Hill December 2016
Transcript of Stormwater Management Report
The
Ba
thla
Gro
up
Pty
Ltd
Sto
rmw
ate
r M
an
ag
em
en
t R
ep
ort
47
-67
Ro
oty
Hill
Ro
ad
No
rth
, R
oo
ty H
ill
De
ce
mb
er
20
16
© C
op
yrig
ht
Ba
rke
r R
ya
n S
tew
art
Pty
Ltd
2016 A
ll R
igh
ts R
ese
rve
d
Pro
jec
t N
o.
SY
16
02
48
Au
tho
r LT
Ch
ec
ke
d
GJ
Ap
pro
ve
d
LT
Re
v N
o.
Sta
tus
Da
te
Co
mm
en
ts
1
DA
1
6/1
2/0
5
Issu
e f
or
DA
CO
PY
RIG
HT
Ba
rke
r R
ya
n S
tew
art
re
serv
es
all
co
pyrig
ht
of
inte
llec
tua
l pro
pe
rty in
an
y o
r a
ll o
f B
ark
er
Rya
n S
tew
art
’s d
oc
um
en
ts. N
o p
erm
issi
on
,
lice
nc
e o
r a
uth
ority
is
gra
nte
d b
y B
ark
er
Rya
n S
tew
art
to
an
y p
ers
on
or
org
an
isa
tio
n t
o u
se a
ny o
f B
ark
er
Rya
n S
tew
art
’s d
oc
um
en
ts
for
an
y p
urp
ose
with
ou
t th
e w
ritt
en
co
nse
nt
of
Ba
rke
r R
ya
n S
tew
art
.
REP
OR
T D
ISC
LAIM
ER
This
re
po
rt h
as
be
en
pre
pa
red
fo
r th
e c
lien
t id
en
tifie
d in
se
ctio
n 1
.0 o
nly
an
d c
an
no
t b
e r
elie
d o
r u
sed
by a
ny t
hird
pa
rty.
An
y
rep
rese
nta
tio
n, st
ate
me
nt,
op
inio
n o
r a
dv
ice
, e
xpre
sse
d o
r im
plie
d in
th
is r
ep
ort
is m
ad
e in
go
od
fa
ith
bu
t o
n t
he
ba
sis
tha
t B
ark
er
Rya
n S
tew
art
are
no
t lia
ble
(w
he
the
r b
y r
ea
son
of
ne
glig
en
ce
, la
ck o
f c
are
or
oth
erw
ise
) to
an
y p
ers
on
fo
r a
ny d
am
ag
e o
r lo
ss
wh
ats
oe
ve
r w
hic
h h
as
oc
cu
rre
d o
r m
ay o
cc
ur
in r
ela
tio
n t
o t
ha
t p
ers
on
ta
kin
g o
r n
ot
takin
g (
as
the
ca
se m
ay b
e)
ac
tio
n in
an
y
resp
ec
t o
f a
ny r
ep
rese
nta
tio
n,
sta
tem
en
t, o
r a
dv
ice
re
ferr
ed
to
ab
ove
.
TAB
LE O
F C
ON
TEN
TS
1
Intr
od
uc
tio
n ..
.................................................................................................. 4
2
Site
Lo
ca
tio
n a
nd
De
ve
lop
me
nt
Pro
po
sal ................................................ 5
2.1
G
en
era
l .............................................................................................................. 5
2.2
P
rop
ose
d D
eve
lop
me
nt
................................................................................. 5
3
Co
un
cil’
s Sto
rmw
ate
r M
an
ag
em
en
t R
eq
uire
me
nts
............................... 6
3.1
C
ou
nc
il’s
po
licy ..
.............................................................................................. 6
4
Su
mm
ary
......................................................................................................... 7
5
Re
fere
nc
es .
..................................................................................................... 9
ATT
AC
HM
EN
T A
– P
RO
PO
SED
DEV
ELO
PM
EN
T
ATT
AC
HM
EN
T B
– O
SD
SP
REA
DSH
EET
ATT
AC
HM
EN
T C
– O
SD
CA
TCH
MEN
T P
LAN
ATT
AC
HM
EN
T D
– R
OO
F P
LAN
47-6
7 R
oo
ty H
ill R
oa
d N
ort
h, R
oo
ty H
ill
Sto
rmw
ate
r M
an
ag
em
en
t R
ep
ort
Pa
ge
4
1
Intr
od
uc
tio
n
This
re
po
rt h
as
be
en
pre
pa
red
to
de
tail
the
pro
ce
du
res,
ass
um
ptio
ns
an
d p
ara
me
ters
ad
op
ted
in
th
e
pre
pa
ratio
n o
f a
sto
rmw
ate
r m
an
ag
em
en
t d
esi
gn
fo
r a
pro
po
sed
mu
lti st
ory
de
ve
lop
me
nt
at
Ro
oty
Hill
Ro
ad
No
rth
, R
oo
ty H
ill. B
ark
er
Rya
n S
tew
art
ha
s b
ee
n e
ng
ag
ed
to
un
de
rta
ke
th
e d
esi
gn
to
ass
ist
in t
he
pre
pa
ratio
n o
f a
de
ve
lop
me
nt
ap
plic
atio
n.
In t
he
pre
pa
ratio
n o
f th
e d
eta
iled
de
sig
n, th
e f
ollo
win
g s
torm
wa
ter
ma
na
ge
me
nt
co
mp
on
en
ts h
ave
be
en
co
nsi
de
red
:
1.
The
exis
tin
g s
ite
co
nd
itio
ns,
sto
rmw
ate
r ru
no
ff a
nd
do
wn
stre
am
dra
ina
ge
syst
em
.
2.
On
-site
de
ten
tio
n (
OSD
) to
ass
ist
in r
eta
rdin
g p
ea
k f
low
s to
th
eir p
red
eve
lop
me
nt
leve
ls
3
. W
ate
r q
ua
lity o
ffse
t sc
he
me
as
pe
r C
ou
nc
il’s
DC
P p
art
J.
4.
Co
un
cil’
s st
orm
wa
ter
ma
na
ge
me
nt
req
uire
me
nts
fo
r o
n-s
ite
de
ten
tio
n (
OSD
).
47-6
7 R
oo
ty H
ill R
oa
d N
ort
h, R
oo
ty H
ill
Sto
rmw
ate
r M
an
ag
em
en
t R
ep
ort
Pa
ge
5
2
Site
Lo
ca
tio
n a
nd
De
ve
lop
me
nt
Pro
po
sal
2.1
G
en
era
l
The
pro
po
sed
de
ve
lop
me
nt
is d
esc
rib
ed
as
lot
1 in
DP
875266
, lo
t 5 in
DP
875266
, lo
t A
in
DP
399706
, lo
t
60B
/3610
39
, a
nd
lo
t 60
A/3
61039 a
lso
kn
ow
n a
s 47
-67 R
oo
ty H
ill R
oa
d N
ort
h, R
oo
ty H
ill.
The
lo
ca
tio
n o
f th
e
site
is
sho
wn
in
Fig
ure
2.1
be
low
.
Fig
ure
2.1
: Site
lo
ca
tio
n (
SIX
Ma
ps
20
16
)
2.2
Ex
istin
g S
ite
The
are
a o
f th
e p
rop
ose
d s
ite
pre
sen
tly h
as
a f
ew
co
mm
erc
ial b
uild
ing
s a
nd
so
me
sh
ed
s. T
he
to
tal a
rea
of
de
ve
lop
me
nt
on
ce
co
mp
lete
will
be
ap
pro
xim
ate
ly 0
.64
37 h
ec
tare
s, t
he
site
ge
ne
rally
slo
pe
s fr
om
no
rth
to
so
uth
.
The
le
ng
th o
f th
e e
xis
tin
g p
ipe
fro
m e
xis
tin
g P
it 1
/8 t
o t
he
pro
po
se P
it 1
/7 h
as
be
en
ass
um
ed
an
d t
he
inve
rt is
un
kn
ow
n. Th
e e
xis
tin
g p
ipe
line
be
twe
en
th
ese
tw
o p
its
ma
y b
e r
eq
uire
d t
o b
e lo
we
red
, h
ow
eve
r
de
sig
n t
ake
s in
to a
cc
ou
nt
the
sta
nd
ard
600m
m c
ove
r to
ob
tain
ass
um
ed
de
sig
n in
ve
rt.
2.3
P
rop
ose
d D
ev
elo
pm
en
t
The
pro
po
sed
de
ve
lop
me
nt
co
nsi
sts
of
the
co
nst
ruc
tio
n o
f P
rem
ier
Lan
e t
o e
xte
nd
an
d c
on
ne
ct
to R
oo
ty
Hill
Ro
ad
an
d a
sso
cia
ted
dra
ina
ge
in
su
pp
ort
of
a h
igh
ris
e d
eve
lop
me
nt.
Two
on
-site
de
ten
tio
n t
an
ks
are
pro
po
sed
with
on
e b
ein
g a
n a
bo
ve
gro
un
d s
yst
em
fo
r B
loc
k A
lo
ca
ted
we
st o
f th
e b
uild
ing
an
d a
be
low
gro
un
d s
yst
em
fo
r B
loc
k B
lo
ca
ted
ea
st o
f th
e b
uild
ing
. Th
e t
an
ks
we
re
size
d u
sin
g c
ou
nc
ils O
SD
sp
rea
dsh
ee
t, t
he
ro
ad
wa
s b
yp
ass
ed
an
d s
om
e p
art
s o
f th
e f
ron
t o
f B
loc
k B
wa
s
als
o b
yp
ass
ed
. B
ase
d o
n t
he
sp
rea
dsh
ee
t th
e v
olu
me
re
qu
ire
d w
as
138
.2m
3 f
or
blo
ck A
ba
sin
an
d 7
6.4
m3
for
blo
ck B
ba
sin
. W
ate
r q
ua
lity m
ea
sure
s w
ill b
e p
rovid
ed
as
a v
olu
nta
ry c
on
trib
utio
n w
ill b
e e
nte
red
in
to
with
Co
un
cil.
The
co
nfig
ura
tio
n o
f th
e p
rop
ose
d d
eve
lop
me
nt
is s
ho
wn
on
th
e p
lan
s c
on
tain
ed
in
att
ac
hm
en
t A
.
47-6
7 R
oo
ty H
ill R
oa
d N
ort
h, R
oo
ty H
ill
Sto
rmw
ate
r M
an
ag
em
en
t R
ep
ort
3
Co
un
cil’s
Sto
rmw
ate
r M
an
ag
em
en
t R
eq
uire
me
nts
3.1
C
ou
nc
il’s
po
lic
y
Re
fere
nc
e w
as
ma
de
to
Bla
ckto
wn
City C
ou
nc
il’s
De
ve
lop
me
nt
Co
ntr
ol p
lan
(D
CP
) 2
015
, En
gin
ee
rin
g
Gu
ide
fo
r D
eve
lop
me
nt
2005 a
nd
Civ
il w
ork
sp
ec
ific
atio
n.
This
de
ve
lop
me
nt
falls
with
in t
he
oth
er
Ha
wke
sbu
ry a
rea
fo
r o
nsi
te d
ete
ntio
n (
OSD
) a
nd
co
un
cil’
s O
SD
spre
ad
she
et
ha
s b
ee
n u
sed
to
de
term
ine
th
e m
inim
um
vo
lum
e r
eq
uire
d b
loc
k A
an
d b
loc
k B
. Th
e r
oa
d
ha
s b
ee
n c
on
sid
ere
d w
ith
th
e c
alc
ula
tio
ns.
Re
fer
to a
tta
ch
me
nt
B f
or
the
OSD
ca
lcu
latio
n s
he
et
an
d
att
ac
hm
en
t C
fo
r th
e O
SD
ca
tch
me
nt
pla
n.
Wa
ter
qu
alit
y w
ill n
ot
be
pro
vid
ed
as
a v
olu
nta
ry c
on
trib
utio
n w
ill b
e e
nte
red
as
pe
r D
CP
Pa
rt J
.
Co
un
cil
req
uire
s th
e b
usi
ne
ss p
art
of
the
bu
ildin
g t
o s
up
ply
80
% o
f th
eir n
on
-po
tab
le d
em
an
d u
sin
g n
on
po
tab
le w
ate
r, M
USIC
wa
s u
sed
to
mo
de
l th
is r
eq
uire
me
nt.
Bu
ildin
g A
ha
s a
min
imu
m r
oo
f a
rea
of
400m
2
dra
inin
g t
o t
he
ra
inw
ate
r ta
nk a
nd
Bu
ildin
g B
ha
s a
min
imu
m r
oo
f a
rea
of
20
0 m
2. Th
e r
ain
wa
ter
reu
se r
ate
of
0.1
KL/
da
y p
er
toile
t/u
rin
al (e
xc
lud
ing
an
y d
isa
ble
d t
oile
t) w
as
ap
plie
d a
nd
th
e t
ota
l re
use
ra
te o
f
0.6
KL/
da
y (
tota
l o
f 6 t
oile
ts a
nd
urin
als
) w
as
ap
plie
d f
or
bu
ildin
g A
an
d 0
.3K
L/d
ay (
tota
l o
f 3 t
oile
ts a
nd
urin
als
) w
as
ap
plie
d f
or
bu
ildin
g B
. It
wa
s a
ssu
me
d t
he
re
tail
bu
ildin
gs
wo
uld
be
op
en
7 d
ays
a w
ee
k. In
ord
er
to m
ee
t th
e 8
0%
no
n-p
ota
ble
de
ma
nd
a 3
0K
L ra
inw
ate
r ta
nk w
as
pro
vid
ed
fo
r b
uild
ing
A a
nd
a
15K
L ra
inw
ate
r ta
nk w
as
pro
vid
ed
fo
r b
uild
ing
B.
Re
fer
to a
tta
ch
me
nt
D f
or
the
ro
of
ca
tch
me
nt
pla
n.
47-6
7 R
oo
ty H
ill R
oa
d N
ort
h, R
oo
ty H
ill
Sto
rmw
ate
r M
an
ag
em
en
t R
ep
ort
4
Su
mm
ary
The
on
site
de
ten
tio
n O
SD
an
d w
ate
r c
on
serv
ati
on
re
qu
ire
me
nts
fo
r th
e s
ite
ha
s b
ee
n d
esi
gn
ed
in
ac
co
rda
nc
e w
ith
co
un
cils
En
gin
ee
rin
g G
uid
elin
e f
or
De
ve
lop
me
nts
2005 a
nd
co
un
cils
De
ve
lop
me
nt
Co
ntr
ol P
lan
2015 P
art
J W
ate
r Se
nsi
tive
Urb
an
De
sig
n a
nd
In
teg
rate
d W
ate
r C
yc
le M
an
ag
em
en
t
47-6
7 R
oo
ty H
ill R
oa
d N
ort
h, R
oo
ty H
ill
Sto
rmw
ate
r M
an
ag
em
en
t R
ep
ort
5
Re
co
mm
en
da
tio
ns
The
in
ve
stig
atio
ns
un
de
rta
ke
n in
pre
pa
rin
g t
his
re
po
rt h
ave
sh
ow
n t
ha
t th
e s
torm
wa
ter
ge
ne
rate
d f
rom
the
pro
po
sed
de
ve
lop
me
nt
ca
n b
e a
de
qu
ate
ly m
an
ag
ed
th
rou
gh
th
e p
rovis
ion
of
ap
pro
pria
te
dra
ina
ge
an
d w
ate
r q
ua
lity in
fra
stru
ctu
re o
n t
he
site
.
The
sp
ec
ific
re
sults
fro
m t
he
in
ve
stig
atio
ns
un
de
rta
ke
n h
ave
de
mo
nst
rate
d t
ha
t:
1.
The
pro
po
sed
de
ve
lop
me
nt
will
be
dra
ine
d t
o t
he
ke
rb in
let
pit in
th
e n
ew
exte
nsi
on
of
Pre
mie
r La
ne
.
2.
All
are
as
exc
lud
ing
th
e n
ew
exte
nsi
on
of
pre
mie
r la
ne
an
d s
om
e o
f th
e f
ron
t la
nd
sca
pe
are
a w
ill b
e
red
ire
cte
d t
o t
he
OSD
ta
nk p
rio
r to
le
avin
g t
he
site
.
3.
Fo
r b
uild
ing
A, th
e m
inim
um
on
site
de
ten
tio
n (
OSD
)vo
lum
e r
eq
uire
d is
138
.2m
3 w
ith
a m
axim
um
orific
e
dia
me
ter
of
105
.24
mm
.
4.
Fo
r b
uild
ing
B, th
e m
inim
um
on
site
de
ten
tio
n (
OSD
)vo
lum
e r
eq
uire
d is
76
.4m
3 w
ith
a m
axim
um
orific
e
dia
me
ter
of
91
.44m
m.
5.
The
pro
po
sed
de
ve
lop
me
nt
will
ha
ve
a b
en
efic
ial e
ffe
ct
on
th
e q
ua
lity o
f st
orm
wa
ter
lea
vin
g t
he
site
thro
ug
h t
he
use
of
tra
sh r
ac
ks
in t
he
on
-site
de
ten
tio
n s
yst
em
, th
e in
sta
llatio
n o
f a
30K
L ra
inw
ate
r ta
nk
for
bu
ildin
g A
an
d a
15K
L ra
inw
ate
r ta
nk f
or
bu
ildin
g B
.
6.
A c
on
trib
utio
n w
ill b
e e
nte
red
in
to w
ith
Co
un
cil
wh
ich
wo
uld
re
sult in
th
e w
ate
r fr
om
th
e s
ite
be
ing
furt
he
r tr
ea
ted
.
47-6
7 R
oo
ty H
ill R
oa
d N
ort
h, R
oo
ty H
ill
Sto
rmw
ate
r M
an
ag
em
en
t R
ep
ort
6
Re
fere
nc
es
Arg
ue
J, 20
07
, “B
asi
c P
roc
ed
ure
s fo
r ‘s
ou
rce
co
ntr
ol’
of
sto
rmw
ate
r”,
En
gin
ee
rin
g E
du
ca
tio
n A
ust
ralia
,
Me
lbo
urn
e
The
In
stitu
tio
n o
f En
gin
ee
rs A
ust
ralia
, 198
7, “A
ust
ralia
n R
ain
fall
an
d R
un
off
: A
gu
ide
to
Flo
od
est
ima
tio
n”,
The
In
stitu
tio
n o
f En
gin
ee
rs A
ust
ralia
, C
an
be
rra
Bla
ckto
wn
City C
ou
nc
il D
eve
lop
me
nt
Co
ntr
ol P
lan
, 2
015
, “P
art
J W
ate
r Se
nsi
tive
Urb
an
De
sig
n a
nd
Inte
gra
ted
Wa
ter
Cyc
le M
an
ag
em
en
t “&
“P
art
A In
tro
du
ctio
n a
nd
Ge
ne
ral G
uid
elin
es”
& “
Pa
rt C
De
ve
lop
me
nt
with
in R
esi
de
ntia
l Zo
ne
s”.
htt
p:/
/ww
w.b
lac
kto
wn
.nsw
.go
v.a
u
Bla
ckto
wn
City C
ou
nc
il’s
“En
gin
ee
rin
g G
uid
e f
or
De
ve
lop
me
nt”
, 2005 h
ttp
://w
ww
.bla
ckto
wn
.nsw
.go
v.a
u
Bla
ckto
wn
City C
ou
nc
il’s
“W
ork
s Sp
ec
ific
atio
n C
ivil”
, 2005 h
ttp
://w
ww
.bla
ckto
wn
.nsw
.go
v.a
u
Bla
ckto
wn
City C
ou
nc
il’s
Wa
ter
Se
nsi
tive
Urb
an
De
sig
n In
form
atio
n S
he
ets
(N
o.1
– N
o. 7
),
htt
p:/
/ww
w.p
lan
nin
g.n
sw.g
ov
.au
/
Fa
cili
ty f
or
Ad
va
nc
ing
Wa
ter
Bio
filtra
tio
n (
FA
WB
), 2
008
, “B
iore
ten
tio
n F
ilte
r M
ed
ia G
uid
elin
es”
, ve
rsio
n 2
.01
,
Ma
rch
2008.
Mu
sic
De
ve
lop
me
nt
Tea
m C
RC
fo
r C
atc
hm
en
t H
yd
rolo
gy, 2005
, “M
usi
c U
ser
Gu
ide
”, C
RC
fo
r C
atc
hm
en
t
Hyd
rolo
gy,
Au
stra
lia, w
ww
.to
olk
it.n
et.
au
/mu
sic
Syd
ne
y C
atc
hm
en
t A
uth
ority
, ‘A
gu
ide
to
th
e u
se o
f M
USIC
in
Syd
ne
y’s
Drin
kin
g W
ate
r C
atc
hm
en
ts –
dra
ft t
rain
ing
ve
rsio
n’,
SC
A, P
en
rith
.
47-6
7 R
oo
ty H
ill R
oa
d N
ort
h, R
oo
ty H
ill
Sto
rmw
ate
r M
an
ag
em
en
t R
ep
ort
ATT
AC
HM
EN
T A
PR
OP
OSED
DEV
ELO
PM
EN
T
47-6
7 R
oo
ty H
ill R
oa
d N
ort
h, R
oo
ty H
ill
Sto
rmw
ate
r M
an
ag
em
en
t R
ep
ort
ATT
AC
HM
EN
T B
OSD
SP
REA
DSH
EET
26
4m
3/h
a
14
7l/s/h
a
0.3
98
6h
a
10
5.2
30
m3
Ba
sic
dis
ch
arg
e0
.05
86
m3/s
Are
a o
f s
ite
dra
ine
d0
.32
86
ha
[D]/[A
] (M
inim
um
8
0%
)8
2.4
%
Sto
rag
e p
er
ha
.of
co
ntr
ibu
tin
g a
rea
ad
juste
d4
10
.33
PS
D a
dju
stm
en
t6
6.9
7l/s/h
a
De
term
ine
PS
D2
2.0
1l/s
Ma
xim
um
he
ad
to
ori
fic
e (
TW
L -
Ce
ntr
e O
rifi
ce
RL
)4
2.0
0-
41
.15
0.8
5m
Se
lecte
d o
rifice
dia
me
ter
10
5.2
4m
m
Ma
xim
um
dis
ch
arg
e2
2.0
1l/s
He
ad
fo
r h
igh
ea
rly d
isc
ha
rge
(W
eir
RL
- C
en
tre
Ori
fic
e R
L)
41
.90
-4
1.1
50
.75
m
Hig
h e
ary
dis
ch
arg
e2
0.6
7l/s
Ap
pro
xim
ate
me
an
dis
ch
arg
e2
1.3
4l/s
Ave
rag
e d
isch
arg
e/h
a6
4.9
5l/s/h
a
Vo
lum
e/P
SD
ad
justm
en
t4
20
.7m
3/h
a
FIN
AL
ST
OR
AG
E R
EQ
UIR
ED
138
.2m
3
SIT
E A
RE
A
Ba
sic
sto
rag
e v
olu
me
Re
qu
ire
d V
olu
me
Re
qu
ire
d D
isc
ha
rge
ON
-SIT
E S
TO
RM
WA
TE
R D
ET
EN
TIO
N C
AL
CU
LA
TIO
N S
HE
ET
26
4m
3/h
a
14
7l/s/h
a
0.2
45
1h
a
64
.70
6m
3
Ba
sic
dis
ch
arg
e0
.03
60
m3/s
Are
a o
f s
ite
dra
ine
d0
.20
89
ha
[D]/[A
] (M
inim
um
8
0%
)8
5.2
%
Sto
rag
e p
er
ha
.of
co
ntr
ibu
tin
g a
rea
ad
juste
d3
56
.77
PS
D a
dju
stm
en
t7
9.5
4l/s/h
a
De
term
ine
PS
D1
6.6
2l/s
Ma
xim
um
he
ad
to
ori
fic
e (
TW
L -
Ce
ntr
e O
rifi
ce
RL
)4
2.0
0-
41
.15
0.8
5m
Se
lecte
d o
rifice
dia
me
ter
91
.44
mm
Ma
xim
um
dis
ch
arg
e1
6.6
2l/s
He
ad
fo
r h
igh
ea
rly d
isc
ha
rge
(W
eir
RL
- C
en
tre
Ori
fic
e R
L)
41
.90
-4
1.1
50
.75
m
Hig
h e
ary
dis
ch
arg
e1
5.6
1l/s
Ap
pro
xim
ate
me
an
dis
ch
arg
e1
6.1
1l/s
Ave
rag
e d
isch
arg
e/h
a7
7.1
3l/s/h
a
Vo
lum
e/P
SD
ad
justm
en
t3
65
.7m
3/h
a
FIN
AL
ST
OR
AG
E R
EQ
UIR
ED
76.4
m3
SIT
E A
RE
A
Ba
sic
sto
rag
e v
olu
me
Re
qu
ire
d V
olu
me
Re
qu
ire
d D
isc
ha
rge
ON
-SIT
E S
TO
RM
WA
TE
R D
ET
EN
TIO
N C
AL
CU
LA
TIO
N S
HE
ET
47-6
7 R
oo
ty H
ill R
oa
d N
ort
h, R
oo
ty H
ill
Sto
rmw
ate
r M
an
ag
em
en
t R
ep
ort
ATT
AC
HM
EN
T C
OSD
CA
TCH
MEN
T P
LAN
OS
D C
atch
men
t Pla
n
Bui
ldin
g A
tota
l Cat
chm
ent
=0.
3986
ha
Bui
ldin
g A
Byp
ass
Cat
chm
ent
=0.
0700
ha
Bui
ldin
g B
tota
l Cat
chm
ent
=0.
2451
ha
Bui
ldin
g B
tota
l Cat
chm
ent
=0.
0362
ha
Bui
ldin
g B
Byp
ass
Cat
chm
ent
= 0
.036
2 ha
47-6
7 R
oo
ty H
ill R
oa
d N
ort
h, R
oo
ty H
ill
Sto
rmw
ate
r M
an
ag
em
en
t R
ep
ort
ATT
AC
HM
EN
T D
RO
OF P
LAN
Ly
Text Box
Water Conservation Roof Plan
