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8/3/2019 Nevada; Vegetated Swales and Buffers: Low Impact Development in Northern Nevada - University of Nevada
http://slidepdf.com/reader/full/nevada-vegetated-swales-and-buffers-low-impact-development-in-northern-nevada 1/4
Nonpoint Education for Municipal Officials
Protecting water quality through community planning
ow Impact Development (LID) is a sustainable approach to stormwater management that minimizes
y. V b y LID y . Ty y b
k , b, y . I z b
and a swale.
Low Impact Development in Northern
Nevada: Vegetated Swales and Buffers
Ditches are excavated channels
that are constructed to convey
.
Ditches are not constructed to
qy b.
Swales,
b, , y-
sloped vegetated open channels
,
out stormwater pollutants and
.
Ty b
b ( LID
N N: B,
FS-09-25) b
y
.
A
, by
. T
sediments and pollutants to drop
out and be processed by the
plants and soil. Some stormwater
k by
, , x
LID ,
provides groundwater recharge.
S
, b
Fact Sheet FS-09-26
By Susan Donaldson, W Qy E S
UNIVERSITY OF NEVADA COOPERATIVE EXTENSION
L
Cy © 2009, Uy
N C Ex.
All rights reserved.
Benets of Swalesand Buffers
n FILTER stormwater
n TRAP
pollutants
n SLOW stormwater
n REDUCE soil erosion
n SAVE money by
,
n PROVIDE
www.unce.unr.edu/nemo
This grassy swale inCarson City
receives and inltratesrunoff from the
parking lot.
S u s a n D o n a l d s o n
C h r i s C o n w a y
8/3/2019 Nevada; Vegetated Swales and Buffers: Low Impact Development in Northern Nevada - University of Nevada
http://slidepdf.com/reader/full/nevada-vegetated-swales-and-buffers-low-impact-development-in-northern-nevada 2/4
pipes. Vegetated swales are most
overall site design and can be used
landscaping requirements.
T
,
b b
100
b b 0.5 2.5
. I
, k b
2.5
channel slope. With increasing
,
. S
can be designed to incorporate
x ,
,
they can be constructed at the
, k
. Py
, y, q
.
S y
b ,
q . I
-
, q
b.
I N,
as dry stream channels with
k
b ,
b
stormwater treatment.
Bufer strips,
b, y
landscaping installed between or
. S
k, y
,
y
b
.
A b
located between a lawn and any
can be watered without the use
k. O, b
b b y k .
I y ,
been constructed to drain to the
k . I
, b
two purposes: it will capture
overspray and interrupt any
.
B
-
q
. Ty
be installed over soils that have
q (
LID in Northern Nevada: Soil
C, FS-09-23)
b
x
4 . T
b b
z ,
but should spread out across
b
xz .
F , -
,
y b
y b .
Page 2 n Low Impact Development in Northern Nevada: Vegetated Swales and Buffers
For a descripon of
various Low Impact
Development pracces,
Fact Sheets in the “Low
Impact Development in
Northern Nevada” series:
LID: An Introducon, FS-09-22
Soil Consideraons, FS-09-23
Rainwater Harvesng,
FS-09-24
Bioretenon, FS-09-25
Vegetated Swales and
Buers, FS-09-26
Green Roofs, FS-09-27
Plant Materials, FS-09-28
Porous Pavement, FS-09-29
Roadway and Parking
Lot Design, FS-09-30
Maintenance, FS-09-31
Ditches lack vegetation to help lter pollutants and stabilize soils.
S u s a n D o n a l d s o n
8/3/2019 Nevada; Vegetated Swales and Buffers: Low Impact Development in Northern Nevada - University of Nevada
http://slidepdf.com/reader/full/nevada-vegetated-swales-and-buffers-low-impact-development-in-northern-nevada 3/4
T
b x
k y
the new lawn edge to create
b. F
,
,
areas are virtually impossible to
k
.
R ,
x y
, y
k , ,
k .P b
k
. Sb
-- .
I b
4 ,
to create gently sloping areas that
y
.
Maintenance
Grassy swales need standard
,
, b,
. M
4 to 6 inches high to avoid
drought stress and decrease
. M
b j
demands while avoiding seepage
. Ay
48
hours to avoid mosquito breeding.
M b
b, y
,
Low Impact Development in Northern Nevada: Vegetated Swales and Buffers n Page 3
For addional detailed
planning and design
informaon,
Tk M
Low Impact DevelopmentHbk Tk
M S C
D M b
www.tmstormwater.com.
It’s very difcult to avoid overspray and runoff when sloping lawns end at the sidewalk or the street (top photo). It’s especially difcult to use sprinklers to irrigate small areas such as this onewithout creating runoff. Often, much water is wasted. Buffers canbe constructed between the sidewalk and lawn (bottom photo).Select low-water-use plants that can be irrigated using dripsystems to save money, as well as decrease runoff.
Buffers can
save water by
decreasing
runoff and
overspray
S u s a n D o n a l d s o n
S u s a n D o n a l d s o n
Plants for vegetated swales and buer strips should meet the
following criteria:
n N -
n Low water use
n L z q
n M
n A
P z
b b . T b
b . H, q
, z ,
y . Dy
b 4 6
x .
S LID N N: P M, FS-09-28,
LID ,
b , .../.
Plants for vegetated swales and buers
Good places for swales
and buers
n Along streets and highwa
n Within street medians
n Within and along the
k
n A
8/3/2019 Nevada; Vegetated Swales and Buffers: Low Impact Development in Northern Nevada - University of Nevada
http://slidepdf.com/reader/full/nevada-vegetated-swales-and-buffers-low-impact-development-in-northern-nevada 4/4
Page 4 n Low Impact Development in Northern Nevada: Vegetated Swales and Buffers
, ,
. P
b q,
. R
repair eroded areas as needed.
T
, z
should be minimized in vegetated
b . T
z
, -
plant species with minimal
z q. A
z,
y , ’
z x.
T -
species will also allow minimal
. U ,
b -
pulling to control weeds.
Technical review provided
by Chris Conway, Cered
Professional in Sediment
and Erosion Control.
Some swales are lined with rock and have limited plant material. This makes it more difcult to removeaccumulated sediment, and decreases pollutant processing by plants. Primary benets include water retention/ inltration and sediment removal.
Rock-lined swales remove sediment, limit plant fltration
M e l o d y H e f n e r
LID is used because it is:
EFFECTIVE in reducing and
b ;
ECONOMICAL , when
q LID
;
SIMPLE!
M LID
y ,
x b;
FLEXIBLE and customized
;
USEFUL in achieving
bj:
,
b,
b ,
y,
.;
DESIRABLE, because it
adds value when the
to achieve LID goals
y
. T
property values.
Addional informaon about vegetated swales and buers can be found at:
n U.S. E P Ay, 1999, S Ty F S, V S,
832-F-99-006, ..//b/.
n LID S T NPDES P II C, V S,
../2/.
n C S BMP Hbk, N D R, V S,
TC-30, .bbk./D/D/TC-30.
Cy © 2009, Uy N C Ex. A . N b y b, , b, , , y, y, y by
y , , y, b y. T Uy N, R Eq Ey Oy/A A y b , , , x, , , , , y
by, x y y . T Uy N y y US z y z k U S.