cross section a - a1 · 2016 scale: 1/8" = 1'-0" roof 1: 274 s.f. x .08 = 22 cu ft...
TRANSCRIPT
Roof 1: 274 sf Roof 2: 290 sf
17'-0"
14'-2
"
16'-2
"
20'-6"
O.H.L.
99
98.5
9897
97.5
96.5
99
989796.5
98.597.5
A A1
util pole
guy wire
exst. wisteria
exst wisteria
s i d e w a l k
over
flow
Exst French drain below grade
Proposed river cobble swale to carry surface water toward rain garden
Extend buried pipes from sump pump & French drain to empty into rain garden
Rain garden -- 150 sq ft -- see planting detail
River cobble at overflow
T H I R D S T R E E T S O U T H
Berm around lower side of rain garden
26'-0
" (+
/-)
6'-0" (+/-)
asphaltdriveway
Additional conservation planting area
River cobble where pipe daylights into rain garden
Roofs drain directly onto ground below. There is currently a French drain underground along the perimeter of the building.
0 5 10 FT
Outline of previous house addition to be shown with stone band (not part of Arlington StormwaterWise project)
Bal
l-Sel
lers
Hou
se M
useu
m56
20 3
rd S
t. So
uth
Arli
ngto
n, V
A 2
2204
Plan
Vie
w &
Stor
mw
ater
Cal
cula
tions
Arli
ngto
n C
ount
ySt
orm
wat
erW
ise
Prog
ram
Edward ColahanLandscape Design3276 Valley Dr.Alexandria, VA 22302
Dat
e: J
uly
26, 2
016
Scal
e: 1
/8"
= 1'
-0"
Roof 1: 274 s.f. x .08 = 22 cu ftRoof 2: 290 s.f. x .08 = 23 cu ft
Total volume for 1" storm event: 45 cu ft
Infiltration Test Results: 4.7 in/hr.Stormwater calculations for 1" storm event:6" ponding area: 150 s.f. x .5 = 75 cu ft6" bioretention soil: 150 s.f. x .5 x .25 = 18.75 cu ft
Total treatment volume: 93.75 cu ft (or roughly 2" storm event)
Rain garden treatment calculations:
PLANT LIST
TREES & SHRUBS:
Code Botanical Name Common Name Qty. Size
Mp-f Morella (Myrica) pensylvanica - female Northern bayberry 2 36"
Mp-m Morella (Myrica) pensylvanica - male Northern bayberry 1 36"
PERENNIALS & ORNAMENTAL GRASSES:
Code Botanical Name Common Name Qty. Size
Ah Amsonia hubrichtii Bluestar 3 1 gal
At Asclepias tuberosa Butterfly milkweed 8 1 gal
Cv Coreopsis verticillata 'Zagreb' Threadleaf coreopsis 18 1 qt
Ep Echinacea purpurea Purple coneflower 12 1 qt
Ls Liatris spicata Blazing star 7 1 gal
Pa Packera aurea Golden ragwort 18 1 qt
Pv Panicum virgatum'Rotstrahlbusch' Swtichgrass 4 1 gal
Rf Rudbeckia fulgida Black-eyed Susan 12 1 qt
Rh Ruellia humilis Wild petunia 7 1 qt
Ss Schyzachyrium scoparium Little bluestem 11 1 gal
Ssp Solidago sphacelata 'Golden Fleece' Golden Fleece goldenrod 12 1 qt
Sh Sporobolus heterolepis Prairie dropseed 14 1 gal
Ep
Ep
Ep
Cv CvRf
EpPv
Pv
Pv
Pv
AtAt
At At
Ls
CvCv
Cv Cv Cv
Cv Cv
CvCv
Cv
CvCv
CvCvCv
Ls
LsLs Ls Ls
AhAh
Ah
RfRf
Rf
RfRfRf
Rf
Rf
Rf
Rf
Rf
ShSh
Sh
Sh
ShSh
Sh
Sh
Sh
Sh
Sh
Sh
Sh
ShSs
Ss
Ss Ss
Ss
Ss
RhRh
Rh RhRh
Rh
Ep
Ep
Ep
Ep
Ep
Ep
Ep
Rh
AtAt At
At
Cv
Ss
Ss
Ss
Ss
Ss
Ls
Mp-fMp-m
Mp-f
(2) Mp-f - Morella pensylvanica (female)
(14) Sh - Sporobolus heterolepis
(18) Cv - Croeopsis verticillata 'Zagreb'
(8) At - Asclepias tuberosa
(4) Pv - Panicum virgatum
(7) Rh - Ruellia humilis
(7) Ls - Liatris spicata
(18) Pa - Packera aurea
(11) Ss - Schyzachyrium scoparium
(12) Ep - Echinacea purpurea
(12) Rf - Rudbeckia fulgida
(12) Ssp - Solidago sphacelata 'Golden Fleece'
(3) Ah - Amsonia hubrichtii
Planting DetailScale: 1/8" = 1'-0"1
overflow(1) Mp-m - Morella pensylvanica (male)
99989796
Existing grade
Cross Section A - A1Scale: 1/4" = 1'-0"2
Proposed grade
6"
2"
6"
Berm & overflow
car park berm rain garden
2" mulch6" bioretention soil
6" ponding
houselawnlawn
6" ponding
Bal
l-Sel
lers
Hou
se M
useu
m56
20 3
rd S
t. So
uth
Arli
ngto
n, V
A 2
2204
Plan
ting
Det
ail &
Rai
n G
arde
n C
ross
Sec
tion
Arli
ngto
n C
ount
ySt
orm
wat
erW
ise
Prog
ram
Edward ColahanLandscape Design3276 Valley Dr.Alexandria, VA 22302
Dat
e: J
uly
26, 2
016
Scal
e: a
s no
ted
