Disclaimer to put this presentation together I Disclaimer – to put this presentation together, I took generously from previous presentations
given by Emmons & Olivier Resources, the Horsley Witten Group, and the Puget Sound y p g
Action Team. This presentation is to be used solely for educational purposes
This
is n
ot L
ID!
Impa
cts
of L
ow F
low:
Wet
land
s dr
y up
Wet
land
fun
ctions
di
minishe
d
Inva
sive
uplan
d plan
ts
Foot
tra
ffic in
sens
itive
area
s(c
ompa
ction)
Pho
to c
ourte
sy o
f U.S
.G.S
.
LID
Sit
e Pl
anni
ng A
ppro
ach
Iden
tify
Con
serv
atio
n Va
lue
Are
as o
n th
e sit
e su
ch a
s w
etla
nds,
sig
nific
ant t
rees
or t
ract
s of
fore
st, h
abita
t, cu
ltura
l res
ourc
es o
r bu
ffer z
ones
. Rem
ove
thes
e fro
m th
e “d
evel
opab
le a
rea”
.
1.
Plac
e ho
uses
in th
e re
mai
ning
are
a in
a w
ay th
at w
ould
max
imize
re
siden
ts e
njoy
men
t of t
hese
are
as b
y pr
ovid
ing
acce
ss to
ope
n sp
ace
and
pres
ervi
ng v
iew
s.
2.
Alig
n ro
ads
and
trails
on
the
site
to p
rovi
de p
edes
trian
and
vehi
cle
acce
ss.
3.
4. D
raw
lot l
ines
aro
und
the
hom
es.
LID
Tec
hniq
ues
Bior
eten
tion
and
Rai
n Ga
rden
sSt
orm
wate
r Pl
ante
rs, T
ree
Plan
ting
Gree
n Ro
ofto
p Sy
stem
sRa
in B
arre
ls a
nd C
iste
rns
/ W
ater
Re-
use
Perm
eabl
e Pa
ving
Vege
tate
d Sw
ales
Vege
tati
ve B
uffe
rsSt
orm
wate
r W
etla
nds
Stre
am D
aylig
htin
g“C
utti
ng E
dge”
-A
triu
ms,
Gre
en W
alls
Form
ula
for
Low
Impa
ct
Dev
elop
men
t
LID
= e
ngin
eeri
ng+
hydr
olog
y+
ecol
ogy
+ la
nd u
se p
lann
ing
Bior
eten
tion
& R
ain
Gard
ens
Rainga
rden
Per
form
ance
Vege
tati
ve u
ptak
e of
Ve
geta
tive
upt
ake
of
stor
mwa
ter
pollu
tant
sst
orm
wate
r po
lluta
nts
Pret
reat
men
t fo
r Pr
etre
atm
ent
for
susp
ende
d so
lids
susp
ende
d so
lids
Grou
ndwa
ter
rech
arge
Grou
ndwa
ter
rech
arge
Aes
thet
ical
ly P
leas
ing
Aes
thet
ical
ly P
leas
ing
Redu
ctio
n of
pea
k Re
duct
ion
of p
eak
disc
harg
e ra
tedi
scha
rge
rate
Stor
mwa
ter
Plan
ters
Stor
mwa
ter
Plan
ter
Perf
orman
ce Vege
tati
ve u
ptak
e Ve
geta
tive
upt
ake
of s
torm
wate
r of
sto
rmwa
ter
pollu
tant
spo
lluta
nts
Pret
reat
men
t fo
r Pr
etre
atm
ent
for
susp
ende
d so
lids
susp
ende
d so
lids
Aes
thet
ical
ly
Aes
thet
ical
ly
Plea
sing
Plea
sing
Redu
ctio
n of
pea
k Re
duct
ion
of p
eak
disc
harg
e ra
tedi
scha
rge
rate
Scup
pers
into
Sto
rmw
ater
Pla
nter
Stor
mw
ater
Pla
nter
s
Tree
Plant
ing
Tree
Pit
Prop
riet
ary
Plan
ter
Gree
n Ro
ofto
ps a
nd G
arde
ns
Pede
stri
an D
esig
n
phot
o so
urce
: ww
w.gr
eenr
oofs
.org
Sour
ce:
http
://w
ww
.rdro
p.co
m/u
sers
/kris
hna/
rain
wat
r.htm
Rain B
arre
ls a
nd C
iste
rns
Stor
mwate
r Run
off
Stor
mwate
r Run
off
infiltr
ation
infiltr
ation
Best
over
all tr
eatm
ent
Best
over
all tr
eatm
ent
Prac
tice
Prac
tice
Limita
tions
in hi
gh
Limita
tions
in hi
gh
traffic
area
s & w
here
tra
ffic ar
eas &
whe
re
sand
ing/sa
lting i
s sa
nding
/saltin
g is
nece
ssar
yne
cess
ary
Poro
us/G
rid
Pave
men
t Pe
rfor
man
ce
SIGN
IFIC
ANT
MAIN
TENA
NCE
CONS
IDER
ATIO
NSSI
GNIF
ICAN
T MA
INTE
NANC
E CO
NSID
ERAT
IONS
Ope
n Ve
geta
ted
Chan
nels
Vege
tate
d Bu
ffer
Filter
Str
ips
Vege
tate
d Bu
ffer
Filter
Str
ips
Sour
ce:
City
of P
ortla
nd, O
RSo
urce
: C
ity o
f Por
tland
, OR
Gree
n W
alls
Atr
ium
Trea
tmen
t of
stor
mw
ater
usi
ngye
ar-r
ound
veg
etat
ion
indo
ors
BU
ILT
SC
EN
AR
IOB
UIL
T S
CE
NA
RIO
LID
SC
EN
AR
IOL
ID S
CE
NA
RIO
Co
mm
erci
alC
om
mer
cial
Mu
lti-
fam
ilyM
ult
i-fa
mily
Sin
gle
Fam
ilyS
ing
le F
amily
LID
SC
EN
AR
IOL
ID S
CE
NA
RIO
0.0
10.0
20.0
30.0
40.0
50.0
60.0
Tra
ditio
nal
Built
LID
Develo
pm
en
t S
cen
ari
os
Acres of Open Space
Po
nd
s &
In
filtra
tio
n B
asin
s
We
tla
nd
s
Na
tura
l A
rea
s
La
wn
s
More
usable
for
More
usable
for
recre
ation
recre
ation
OP
EN
SP
AC
E
INC
EN
TIV
ES
OP
EN
SP
AC
E
INC
EN
TIV
ES
15.8
more
15.8
more
acre
s than B
uilt
acre
s than B
uilt
0123456789
10
Dis
ch
arg
e
(cfs
)
Tra
ditio
nal
Built
LID
2-y
r 2
4-h
r R
ain
fall (
2.8
in
ch
es)
10
-yr
24
-hr
Ra
infa
ll (
4.2
in
ch
es)
10
0-y
r 2
4-h
r R
ain
fall (
6.0
in
ch
es)
Develo
pm
en
t S
cen
ari
os
Wat
er Q
uan
tity
Rat
es
PE
RF
OR
MA
NC
E
Wat
er Q
uan
tity
Rat
es
PE
RF
OR
MA
NC
E
Peak D
isch
arg
eP
eak D
isch
arg
e
Zero
dis
ch
arg
e u
nd
er
sm
all e
ven
ts!
Zero
dis
ch
arg
e u
nd
er
Zero
dis
ch
arg
e u
nd
er
sm
all e
ven
ts!
sm
all e
ven
ts!
Wat
er Q
uan
tity
Vo
lum
e
PE
RF
OR
MA
NC
E
Wat
er Q
uan
tity
Vo
lum
e
PE
RF
OR
MA
NC
E
An
nu
al S
torm
wate
r V
olu
me
An
nu
al S
torm
wate
r V
olu
me
Du
rin
g a
no
rmal ra
infa
llD
uri
ng
a n
orm
al ra
infa
ll
year
(26.6
in
ch
es)
year
(26.6
in
ch
es)
0
10
0
20
0
30
0
40
0
50
0
60
0
70
0
Volume (acre feet)
Tra
ditio
na
lB
uilt
LID
Develo
pm
en
t S
cen
ari
o
Infi
ltra
ted
Vo
lum
e
Ru
no
ff
Vo
lum
e
Traditio
nal
Built
LID
0
51
1
22
2
0
100
200
300
400
500
600
Volume (ac-ft)
Develo
pm
en
t S
cen
ari
o
Wat
er Q
uan
tity
Vo
lum
e
PE
RF
OR
MA
NC
E
Wat
er Q
uan
tity
Vo
lum
e
PE
RF
OR
MA
NC
E
An
nu
al In
filt
rate
d V
olu
me
An
nu
al In
filt
rate
d V
olu
me
Du
rin
g a
no
rmal ra
infa
ll y
ear
(26.6
in
ch
es)
Du
rin
g a
no
rmal ra
infa
ll y
ear
(26.6
in
ch
es)
Incre
ase in
Incre
ase in
gro
undw
ate
rgro
undw
ate
r
recharg
ere
charg
e
59
.4
72
.5
90
.4
50.0
55.0
60.0
65.0
70.0
75.0
80.0
85.0
90.0
95.0
100.0
Phosphorus Removal (%)
Tra
ditio
nal
Built
LID
Develo
pm
en
t S
cen
ari
os
Wat
er Q
ual
ity
PE
RF
OR
MA
NC
E
Wat
er Q
ual
ity
PE
RF
OR
MA
NC
E
An
nu
al P
ho
sp
ho
rus R
em
oval P
erc
en
tag
eA
nn
ual P
ho
sp
ho
rus R
em
oval P
erc
en
tag
eD
uri
ng
a n
orm
al ra
infa
ll y
ear
(26.6
in
ch
es)
Du
rin
g a
no
rmal ra
infa
ll y
ear
(26.6
in
ch
es)
0
50
100
150
200
250
300
350
Phosphorus Load (lbs/yr)
Exis
ting
Tra
ditio
nal
Built
LID
De
ve
lop
me
nt
Sc
en
ari
os
An
nu
al P
ho
sp
ho
rus L
oad
ing
An
nu
al P
ho
sp
ho
rus L
oad
ing
Du
rin
g a
no
rmal ra
infa
ll y
ear
(26.6
in
ch
es)
Du
rin
g a
no
rmal ra
infa
ll y
ear
(26.6
in
ch
es)
Wat
er Q
ual
ity
PE
RF
OR
MA
NC
E
Wat
er Q
ual
ity
PE
RF
OR
MA
NC
E
Dev
elo
pm
ent
Co
st
INC
EN
TIV
ES
Dev
elo
pm
ent
Co
st
INC
EN
TIV
ES
$$$$
LID
Tec
hnic
al M
anua
l
•Pa
rtne
rshi
p pr
ojec
t.
•G
uida
nce
only
, tai
lore
d to
Pu
get S
ound
.
•B
est C
UR
RE
NT
thin
king
.
•C
ompl
emen
ts E
colo
gy
stor
mw
ater
man
ual.
•B
ackg
roun
d in
form
atio
n,
tech
nica
l spe
cific
atio
ns.
LID
Tec
hnic
al M
anua
l –C
onte
nts
•Si
te a
sses
smen
t
•Si
te p
lann
ing/
layo
ut
•V
eget
atio
n pr
otec
tion
•C
lear
ing
and
grad
ing
•In
tegr
ated
pra
ctic
es
•Fl
ow c
ontro
l cre
dits
•Si
te a
sses
smen
t
•Si
te p
lann
ing/
layo
ut
•V
eget
atio
n pr
otec
tion
•C
lear
ing
and
grad
ing
•In
tegr
ated
pra
ctic
es
•Fl
ow c
ontro
l cre
dits
LID
Tec
hnic
al M
anua
l –C
onte
nts
•Si
te a
sses
smen
t
•Si
te p
lann
ing/
layo
ut
•V
eget
atio
n pr
otec
tion
•C
lear
ing
and
grad
ing
•In
tegr
ated
pra
ctic
es
•Fl
ow c
ontro
l cre
dits
Pho
to c
ourte
sy A
qua-
Tex
Con
sulti
ng
LID
Tec
hnic
al M
anua
l –C
onte
nts
•Si
te a
sses
smen
t
•Si
te p
lann
ing/
layo
ut
•V
eget
atio
n pr
otec
tion
•C
lear
ing
and
grad
ing
•In
tegr
ated
pra
ctic
es
•Fl
ow c
ontro
l cre
dits
Pho
to c
ourte
sy W
ashi
ngto
n D
epar
tmen
t of E
colo
gy
LID
Tec
hnic
al M
anua
l –C
onte
nts
•Si
te a
sses
smen
t
•Si
te p
lann
ing/
layo
ut
•V
eget
atio
n pr
otec
tion
•C
lear
ing
and
grad
ing
•In
tegr
ated
pra
ctic
es
•Fl
ow c
ontro
l cre
dits
Pho
to c
ourte
sy S
eattl
e P
ublic
Util
ities
LID
Tec
hnic
al M
anua
l –C
onte
nts
Inte
grat
ed M
anag
emen
t Pra
ctic
es
•B
iore
tent
ion
•A
men
ded
soils
•Pe
rmea
ble
pave
men
t
•V
eget
ated
roof
s
•R
ainw
ater
har
vest
ing
•M
inim
al e
xcav
atio
n fo
unda
tions
Pho
to c
ourte
sy S
eattl
e P
ublic
Util
ities
•B
iore
tent
ion
•A
men
ded
soils
•Pe
rmea
ble
pave
men
t
•V
eget
ated
roof
s
•R
ainw
ater
har
vest
ing
•M
inim
al e
xcav
atio
n fo
unda
tions
Pho
to c
ourte
sy S
eattl
e P
ublic
Util
ities
Inte
grat
ed M
anag
emen
t Pra
ctic
es
•B
iore
tent
ion
•A
men
ded
soils
•Pe
rmea
ble
pave
men
t
•V
eget
ated
roof
s
•R
ainw
ater
har
vest
ing
•M
inim
al e
xcav
atio
n fo
unda
tions
Phot
o co
urte
sy 2
020
Engi
neer
ing
Inte
grat
ed M
anag
emen
t Pra
ctic
es
•B
iore
tent
ion
•A
men
ded
soils
•Pe
rmea
ble
pave
men
t
•V
eget
ated
roo
fs
•R
ainw
ater
har
vest
ing
•M
inim
al e
xcav
atio
n fo
unda
tions
Pho
to c
ourte
sy S
vRD
esig
n
Inte
grat
ed M
anag
emen
t Pra
ctic
es
•B
iore
tent
ion
•A
men
ded
soils
•Pe
rmea
ble
pave
men
t
•V
eget
ated
roof
s
•R
ainw
ater
har
vest
ing
•M
inim
al e
xcav
atio
n fo
unda
tions
Pho
to c
ourte
sy N
orth
wes
t Wat
er S
ourc
e
Inte
grat
ed M
anag
emen
t Pra
ctic
es
•B
iore
tent
ion
•A
men
ded
soils
•Pe
rmea
ble
pave
men
t
•V
eget
ated
roof
s
•R
ainw
ater
har
vest
ing
•M
inim
al e
xcav
atio
n fo
unda
tions
Pho
to c
ourte
sy T
om H
olz
Inte
grat
ed M
anag
emen
t Pra
ctic
es
App
lyin
g LI
D P
rinci
ples
& P
ract
ices
Gra
phic
cou
rtesy
AH
BL C
ivil
and
Stru
ctur
al E
ngin
eers
Pho
to c
ourte
sy L
ID C
ente
r
tree
cons
erva
tion
• soi
l am
endm
ents
narro
wer
stre
ets
• ope
n dr
aina
ge •
rain
gar
dens
on-s
ite d
eten
tion,
sto
rage
and
infil
tratio
n
Pho
to c
ourte
sy S
eattl
e P
ublic
Util
ities
LID
Pro
ject
s in
Pug
et S
ound
•Se
attle
’s N
atur
al
Dra
inag
e Sy
stem
s
•Ev
ergr
een
Stat
e C
olle
ge
•C
oope
r C
rest
, Oly
mpi
a
•Su
bdiv
isio
n in
Sum
ner
•R
oche
Har
bor
•3
new
Kin
g C
o. p
roje
cts
•M
eado
w o
n th
e H
yleb
os
