Part 1 - Arlingtonva
66
Albizia julibrissin, Mimosa
6, 4
10
0.10
0.35
Intermediate
0.35
Remove
0
Volunteer tree. V-poor scaffold branching. CLF embedded in trunk stem.
65
Acer saccharinum, Silver Maple
2~5
5
0.10
0.45
Codominant
0.23
Remove
0
Multi-stem volunteer tree (10stems). CLF embedded in trunk stem. Severe invasive vine.
64
Robinia pseudoacacia, Black Locust
43
59
60
Morus alba, White Mulberry
Fraxinus americana, White Ash
Ulmus americana, American Elm
61
Ulmus americana, American Elm
63
Paulownia tomentosa, Royal Paulownia
62
6, 7
9.0
14.5
24.0
22.0
13
9
15
24
22
0.10
0.15
0.20
0.20
0.10
0.55
0.45
0.53
0.53
0.53
Codominant
Codominant
Codominant
Codominant
Codominant
0.72
0.61
1.59
2.54
1.17
Remove
Remove
Remove
Remove
Remove
0
1
Remove 6,3
Ailanthus altissima, 2.5, 2.5 Tree of Heaven
9
0.10
0.40
Codominant
0.36
**
0
Remove 5
0.05
0.43
Suppressed
0.11
**
0
24
53
Morus alba, White Mulberry
13.0
13
0.30
0.45
Codominant
1.76
Remove
1
52
Morus alba, White Mulberry
5.3
6
0.30
0.45
Codominant
0.81
Remove
0
54
Morus alba, White Mulberry
10.0
10
0.30
0.45
Codominant
1.35
Remove
1
50
Morus alba, White Mulberry Paulownia tomentosa, Royal Paulownia
14.0
9.0
14
9
0.15
0.30
0.10
0.45
0.45
0.40
Codominant
Codominant
Codominant
1.62
1.89
0.36
Preserve
Remove
Preserve
0
5.5
48
Ulmus americana, American Elm
12, 9, 16
37
0.20
0.53
Dominate
3.92
46
Fraxinus americana, White Ash
11.0
11
0.10
0.53
Codominant
0.58
**
0
47
Paulownia tomentosa, Royal Paulownia
16.0
16
0.08
0.40
Codominant
0.51
Remove
0
45
Prunus serotina, Black Cherry
6.5
7
0.08
0.55
Suppressed
0.31
Preserve
0
44
Albizia julibrissin, Mimosa
6.5, 3.5
10
0.03
0.35
Intermediate
0.11
Preserve
0
75
Paulownia tomentosa, Royal Paulownia
6, 6
12
0.05
0.40
Codominant
0.24
Preserve
0
6
0.06
0.40
Codominant
0.14
Preserve
Preserve
0
0
Remove
X X
X X
Status
Replacement trees
Activites
%
76
4.0
4
0.05
0.40
Suppressed
0.08
Preserve
0
Watersprouts have emerged from and old trunk stem stump. Severe invasive vine is attached to trunk stem. Tree is off-site.
58
Albizia julibrissin, Mimosa
4, 3
7
0.00
0.35
Suppressed
0.00
Preserve
0
Tree 58 is necrotic. Tree is off-site.
57
Morus alba, White Mulberry
5, 5, 5, 5,
0
Volunteer tree. V-severe invasive vine with poor scaffold branching and symmetry. Tree is off-site.
20
0.05
0.45
Suppressed
0.45
Preserve
56
Albizia julibrissin, Mimosa
8, 6, 8
22
0.15
0.35
Codominant
1.16
Preserve
0
55
Paulownia tomentosa, Royal Paulownia
8, 12
20
0.03
0.40
Codominant
0.24
Preserve
0
74
Prunus serotina, Black Cherry
10.5
11
0.05
0.55
Suppressed
0.30
Preserve
0
Plantanus occidentalis, 12, 6.5 American Sycamore
Volunteer tree. V-poor scaffold branching and symmetry. Codominant trunk stem union at root crown. Tree is off-site. Branch stem have emerged from a previously removed trunk stem trunk. V-poor scaffold branching. CLF is embedded in trunk stem. Volunteer tree. Invasive vine has totally attached and grown through the canopy, V-sever invasive vine. Tree is off-site. Volunteer tree. V-poor scaffold branching. Codominant trunk stems at root crown with wide union angle. Severe invasive vine. Twisty leaning trunk stem. Tree is off-site.
Remove 18
0.35
0.58
Codominant
3.65
**
1
Fraxinus americana, White Ash
9.0
9
0.10
0.53
Codominant
0.48
Remove
0
Volunteer tree. Tree 62 is in severe decline. Shows severe storm damage. Located at existing building wall & CLF. Tree is off-site.
71
Acre rubrum, Red Maple
4.5
5
0.63
0.70
Intermediate
2.21
Remove
1
70
Paulownia tomentosa, Royal Paulownia
7.5
8
0.15
0.40
Codominant
0.48
**
0
69
Quercus rubra, Red Oak
3.5
4
0.59
0.75
Intermediate
1.77
Preserve
0
X
68
Platanus occidentalis, American Sycamore
14.0
14
0.58
0.58
Dominate
4.71
Remove
1
X
67
Quercus phellos, Willow Oak
4.0
4
0.65
0.75
Intermediate
1.95
Preserve
0
Volunteer tree. V-severe invasive vine. Twisty leaning trunk stem (~22⁰) Codominant with tree 49 at root crown. Tree is off-site. Volunteer tree. V-severe invasive vine. Twisty arching trunk stem. Root crown rooted a CMU building wall. Poor scaffold branching and symmetry. Tree is off-site. Volunteer tree. Severe invasive vine. Poor scaffold branching and symmetry. Tree is off-site. Volunteer tree. Twisty trunk stem. Invasive E. Ivy at low & mid trunk stem. Poor scaffold branching. Rooted at CMU building wall. Tree is off-site. Volunteer tree. Severe invasive vine from lower to upper trunk stem. Rooted at concrete wall between wall and iron beam. Volunteer tree. V-severe invasive vine. Twisty leaning trunk stem (~45⁰). V-poor scaffold branching and symmetry. Root crown embedded at concrete wall. Tree is off-site. Volunteer tree. Codominant trunk stems at 1.5 VF. Severe invasive vine. Rooted at asphalt paved surface. Tree is off-site. Stem growth has emerged from older removed trunk stem stump. Severe invasive vine is attached and page wire fencing has embedded and grown through the trunk stem. Tree is off-site.
Existing Tree Condition Observations Remove Invasive
R (ft)
Canopy Position Total Score
Crown Raising
*DBH (in)
Field Species Condition Rating
72
Tree stem 51 is one of the multitrunk stems as discribed in tree 53 observations.
X X
CRZ
Volunteer tree. Codominant trunk stem at root crown. Sever invasive vine. Tree is off-site.
Tree stem 54 is one of the multitrunk stems as discribed in tree 53 observations.
1
Size
Paulownia tomentosa, Royal Paulownia
73
Volunteer tree. 5-trunk stems at root crown. Invasive vine is attached up trunk stem and through canopy. V-poor scaffold branching. Tree is off-site. Volunteer tree. Tree has 4-trunk stems at the root crown w/ low union angle. Invasive vine is attached up trunk stem and through canopy. Tree stem 52 is one of the multitrunk stems as discribed in tree 53 observations.
0
Paulownia tomentosa, Royal Paulownia
49
Voluntreer tree. CLF & metal post embedded into trunk stem. V-poor scaffold branching. Codominant trunk stem at 4VF. Shows previous storm damage. Volunteer tree. V-poor scaffold branching & symmetry. Tree shows previous storm damage.
1
5, 4, 5, 5, 4
51
Volunteer tree. E. Ivy embedded on trunk stem & up/through canopy. Codominant trunk stems at ~ 10VF.
1
Morus alba, White Mulberry
42
Volunteer tree w/codominant trunk stem at root rown. CLF embedded in trunk stem. Severe invasive vine attached. Poor scaffold branching. Volunteer tree. V-poor scaffold branching. Invasive vine attached all through canopy. Tree located between wood board fence & iron fence.
0
Species
Crown Reduction
%
Tree #
Existing Tree Condition Observations
Crown Clean
Activites
Tree Protection
Replacement trees
Root Prune
Status
Remove Invasive
R (ft)
Canopy Position Total Score
Crown Raising
*DBH (in)
Field Species Condition Rating
Crown Reduction
CRZ
Crown Clean
Size
Tree Protection
Species
Root Prune
Tree #
Remove
Computed Replacement Tree Total:
Volunteer tree. CLF is embeded into lower trunk stem. Severe invasive vine is attached up and through canopy. New planting. No apparent biotic issues. Good color, vigor and vitality. Tree is off-site. Volunteer tree. Severe invasive vine. Codominant trunk stems at 4VF. Page wire fencing is embedded into trunk stem. Tree is off-site. New planting. No apparent biotic issues. Invasives from adjacent vegetation is migrating to tree 69. Tree is off-site. Tree shows good color, vigor & vitality. Invasive vine is attached at lower & mid trunk stem. Tree is rooted at CLF. Not embedded. New planting with development improvements. No apparent biotic issues. Good symmetry and scaffold branching.
9
DBH = Diameter at Breast Height (measured 4.5 feet above existing grade or as noted).
*
= Diameter measurement as recorded at the root crown where tree has a codominant, or mulit-stem trunk which precludes a measurement at 4.5 ft above existing grade.
** = Existing tree is Off-Site. Removal of this tree will require permission from the adjacent property owner. CRZ = Critical Root Zone (1 foot of radius per inch of tree diameter) CRZ for trees with multiple stems were calculated based on the diameter of a tree with the basal area equal to the sum of the basal areas for all stems measured.
Conditions Ratings provided as percentages as based on methods outlined in the 9th edition of the "Guide for Plant Appraisal", published by the International Socielty of Arboriculture.
ARLINGTON COUNTY STORMWATER DETENTION CALCULATION 7. 1. SITE DESCRIPTION: 6881 Lee Highway (Shreve Oil) ENTER 1 FOR FOUR MILE WATERSHED OR 2 FOR POTOMAC WATERSHED: 1 LOCATION:
STORAGE PROVIDED: AVAILABLE STORAGE VOLUME
A) 55' X 20' X 7.5'
2.21
150.00
SF
d= D=
10.00 6.00
FT FT
D/d =
0.60
d = D =
FOUR MILE RUN WATERSHED
TOTAL AREA =
Vault
Ac.
EASEMENT FOR PUBLIC STREET AND SIDEWALK = AREA REQUIRED FOR DETENTI EXISTING CONDITION: BUILDINGS AND ASPHALT IMPERVIOUS AREA = PERVIOUS AREA =
2.21
0.00
Ac.
B)
Ac.
1.35
X 0.9 +
0.86
X 0.30
1.35 0.86
PARTIAL FLOW AREA = =
6.000 90.00
SF
% USABLE AREA = (B/A)
90.00
SF
=
2.21 TOTAL AREA =
2.21
COMPOSITE "C" =
0.66
AVERAGE VOLUME = (1 +
0.600 80.00%
THEREFORE REQUIRED VOLUME =
PROPOSED CONDITION 1.94
X 0.9 +
0.27
2.21 TOTAL AREA =
2.21
COMPOSITE "C" =
0.83
8. TIME OF CONSENTRATION = 5 MIN. RAINFALL INTENSITY I10= = 7.30 I100= 10.00
PREDEVELOPED RUN-OFF: C = 0.30 (SPECIFIED BY ORDINANCE) C = 0.48 BY PARTIAL WAIVER Q10 = 7.74 CFS
3.
UNDETAINED FLOW : UNDETAINED AREA = UNDETAINED "C" POST DEV Q100 =
0.12 0.29 0.55 1.59
/
150.00
SF
) / 2 TOTAL USEABLE VOLUME 5292 6615
CF CF
CORRESPONDING VAULT LENGTH = =
6615 44
CF LF
/
0.800
/
150.00
SF
ORIFICE Q = C*A* SQ.RT.(2*G*H) --- SIZE THE ORIFICE TO ACCOMMODATE Q ALLOWABLE. WHERE: ORIFICE = 9.75 IN DIA THUS: Q PROV.= 6.13 CFS A = 0.520 SF Q ALLOW.= 6.15 CFS G = 32.20 H = 6.00 FT -- THEREFORE DESIGN ACCEPTABLE C = 0.60
IN/HR IN/HR
2.
15.00
=
X 0.30
1.94 0.27
X
0.600
=
IMPERVIOUS AREA = PERVIOUS AREA =
Vault Depth Storage Depth
X 0.9 +
0.17
X 0.30
0.00
X 0.30
9.
AC. CFS
EMERGENCY SPILLWAY SIZE THE EMERGENCY SPILLWAY TO ACCOMMODATE THE POST-DEVELOPED Q100, ASSUMING THE ORIFICE IS CLOGGED.
0.29
Q = C*L*H^(3/2) 4.
PUBLIC ACCESS EASEMENT AREA PASSING THRU THE DETENTION FACILITY UNDETAINED AND OFF-SITE AREA UNDETAINED.
0.00
X 0.9 +
WHERE: 0
EASEMENT EASEMENT OFF-SITE OFF-SITE
AREA = "C" POST DEV.= AREA = "C" POST DEV.=
0.00 0.00 0.00 0.00
0.00
X 0.9 +
0.00
X 0.30
Q 100 = C= HEAD = L =
CAPACITY =
16.68 3.00 1.50 8.00 3.00
CFS FOR BR. CRESTED WEIR FT FT X
0 Q100 = Q100 = 5.
6.
0.00 0.00
*
10.00
IN/HR
*
0
Ac.
CFS
THEREFORE DESIGN IS ACCEPTABLE
ALLOWABLE RELEASE RATE: Q ALLOWABLE = (Q10) PRE - (Q100) POST UNDETAINED FROM #3 Q ALLOWABLE = 7.74 1.59 = 6.15 ACTUAL RELEASE RATE 6.13 STORAGE VOLUME REQUIRED: DETAINED AREA = 1.920 AC. 1.82 AC. * 0.90 = 1.64 0.10 AC. * 0.30 = 0.03
TOTAL A*C = COMPOSITE "C" = TIME (MIN.) 5 10 15 20 25 30 35 40 50 60 90 120 180
TIME (SEC.) 300 600 900 1200 1500 1800 2100 2400 3000 3600 5400 7200 10800
1.668
CFS CFS
IMPERVIOUS AC.
0.86 I 100 (IN/HR) 10.00 8.10 7.20 6.30 5.70 5.20 4.80 4.30 3.70 3.50 2.65 2.30 1.65
IMP. AC. (A*C) 1.668 1.668 1.668 1.668 1.668 1.668 1.668 1.668 1.668 1.668 1.668 1.668 1.668
Q 100 (CFS) 16.680 13.511 12.010 10.508 9.508 8.674 8.006 7.172 6.172 5.838 4.420 3.836 2.752
VOL.IN (CF) 5004 8106 10809 12610 14261 15612 16813 17214 18515 21017 23869 27622 29724
DISCHARGE (CFS) 6.13 6.13 6.13 6.13 6.13 6.13 6.13 6.13 6.13 6.13 6.13 6.13 6.13
VOL. (CF) 1,839 3,678 5,517 7,356 9,195 11,034 12,873 14,712 18,390 22,068 33,102 44,136 66,204
****** DISCHARGE BASED ON ACTUAL ORIFICE RATE OF FLOW ****** CONCLUSION: MAX. STORAGE --5292 C.F. AT 15 MIN. (100 - YEAR)
STORAGE (CF) 3,165 4,428 5,292 5,254 5,066 4,578 3,940 2,502 125 (1,051) (9,233) (16,514) (36,480)
5 10 15 20 25 30 35 40 50 60 90 120 180
7.3 5.9 5.1 4.5 4 3.71 3.35 3.15 2.73 2.3 1.9 1.48 1.1
10 8.1 7.2 6.3 5.7 5.2 4.8 4.3 3.7 3.5 2.65 2.3 1.65
8.00
FT
X
1.50
FT
^1.5=
44.09
Albizia julibrissin, Mimosa
6, 4
10
0.10
0.35
Intermediate
0.35
Remove
0
Volunteer tree. V-poor scaffold branching. CLF embedded in trunk stem.
65
Acer saccharinum, Silver Maple
2~5
5
0.10
0.45
Codominant
0.23
Remove
0
Multi-stem volunteer tree (10stems). CLF embedded in trunk stem. Severe invasive vine.
64
Robinia pseudoacacia, Black Locust
43
59
60
Morus alba, White Mulberry
Fraxinus americana, White Ash
Ulmus americana, American Elm
61
Ulmus americana, American Elm
63
Paulownia tomentosa, Royal Paulownia
62
6, 7
9.0
14.5
24.0
22.0
13
9
15
24
22
0.10
0.15
0.20
0.20
0.10
0.55
0.45
0.53
0.53
0.53
Codominant
Codominant
Codominant
Codominant
Codominant
0.72
0.61
1.59
2.54
1.17
Remove
Remove
Remove
Remove
Remove
0
1
Remove 6,3
Ailanthus altissima, 2.5, 2.5 Tree of Heaven
9
0.10
0.40
Codominant
0.36
**
0
Remove 5
0.05
0.43
Suppressed
0.11
**
0
24
53
Morus alba, White Mulberry
13.0
13
0.30
0.45
Codominant
1.76
Remove
1
52
Morus alba, White Mulberry
5.3
6
0.30
0.45
Codominant
0.81
Remove
0
54
Morus alba, White Mulberry
10.0
10
0.30
0.45
Codominant
1.35
Remove
1
50
Morus alba, White Mulberry Paulownia tomentosa, Royal Paulownia
14.0
9.0
14
9
0.15
0.30
0.10
0.45
0.45
0.40
Codominant
Codominant
Codominant
1.62
1.89
0.36
Preserve
Remove
Preserve
0
5.5
48
Ulmus americana, American Elm
12, 9, 16
37
0.20
0.53
Dominate
3.92
46
Fraxinus americana, White Ash
11.0
11
0.10
0.53
Codominant
0.58
**
0
47
Paulownia tomentosa, Royal Paulownia
16.0
16
0.08
0.40
Codominant
0.51
Remove
0
45
Prunus serotina, Black Cherry
6.5
7
0.08
0.55
Suppressed
0.31
Preserve
0
44
Albizia julibrissin, Mimosa
6.5, 3.5
10
0.03
0.35
Intermediate
0.11
Preserve
0
75
Paulownia tomentosa, Royal Paulownia
6, 6
12
0.05
0.40
Codominant
0.24
Preserve
0
6
0.06
0.40
Codominant
0.14
Preserve
Preserve
0
0
Remove
X X
X X
Status
Replacement trees
Activites
%
76
4.0
4
0.05
0.40
Suppressed
0.08
Preserve
0
Watersprouts have emerged from and old trunk stem stump. Severe invasive vine is attached to trunk stem. Tree is off-site.
58
Albizia julibrissin, Mimosa
4, 3
7
0.00
0.35
Suppressed
0.00
Preserve
0
Tree 58 is necrotic. Tree is off-site.
57
Morus alba, White Mulberry
5, 5, 5, 5,
0
Volunteer tree. V-severe invasive vine with poor scaffold branching and symmetry. Tree is off-site.
20
0.05
0.45
Suppressed
0.45
Preserve
56
Albizia julibrissin, Mimosa
8, 6, 8
22
0.15
0.35
Codominant
1.16
Preserve
0
55
Paulownia tomentosa, Royal Paulownia
8, 12
20
0.03
0.40
Codominant
0.24
Preserve
0
74
Prunus serotina, Black Cherry
10.5
11
0.05
0.55
Suppressed
0.30
Preserve
0
Plantanus occidentalis, 12, 6.5 American Sycamore
Volunteer tree. V-poor scaffold branching and symmetry. Codominant trunk stem union at root crown. Tree is off-site. Branch stem have emerged from a previously removed trunk stem trunk. V-poor scaffold branching. CLF is embedded in trunk stem. Volunteer tree. Invasive vine has totally attached and grown through the canopy, V-sever invasive vine. Tree is off-site. Volunteer tree. V-poor scaffold branching. Codominant trunk stems at root crown with wide union angle. Severe invasive vine. Twisty leaning trunk stem. Tree is off-site.
Remove 18
0.35
0.58
Codominant
3.65
**
1
Fraxinus americana, White Ash
9.0
9
0.10
0.53
Codominant
0.48
Remove
0
Volunteer tree. Tree 62 is in severe decline. Shows severe storm damage. Located at existing building wall & CLF. Tree is off-site.
71
Acre rubrum, Red Maple
4.5
5
0.63
0.70
Intermediate
2.21
Remove
1
70
Paulownia tomentosa, Royal Paulownia
7.5
8
0.15
0.40
Codominant
0.48
**
0
69
Quercus rubra, Red Oak
3.5
4
0.59
0.75
Intermediate
1.77
Preserve
0
X
68
Platanus occidentalis, American Sycamore
14.0
14
0.58
0.58
Dominate
4.71
Remove
1
X
67
Quercus phellos, Willow Oak
4.0
4
0.65
0.75
Intermediate
1.95
Preserve
0
Volunteer tree. V-severe invasive vine. Twisty leaning trunk stem (~22⁰) Codominant with tree 49 at root crown. Tree is off-site. Volunteer tree. V-severe invasive vine. Twisty arching trunk stem. Root crown rooted a CMU building wall. Poor scaffold branching and symmetry. Tree is off-site. Volunteer tree. Severe invasive vine. Poor scaffold branching and symmetry. Tree is off-site. Volunteer tree. Twisty trunk stem. Invasive E. Ivy at low & mid trunk stem. Poor scaffold branching. Rooted at CMU building wall. Tree is off-site. Volunteer tree. Severe invasive vine from lower to upper trunk stem. Rooted at concrete wall between wall and iron beam. Volunteer tree. V-severe invasive vine. Twisty leaning trunk stem (~45⁰). V-poor scaffold branching and symmetry. Root crown embedded at concrete wall. Tree is off-site. Volunteer tree. Codominant trunk stems at 1.5 VF. Severe invasive vine. Rooted at asphalt paved surface. Tree is off-site. Stem growth has emerged from older removed trunk stem stump. Severe invasive vine is attached and page wire fencing has embedded and grown through the trunk stem. Tree is off-site.
Existing Tree Condition Observations Remove Invasive
R (ft)
Canopy Position Total Score
Crown Raising
*DBH (in)
Field Species Condition Rating
72
Tree stem 51 is one of the multitrunk stems as discribed in tree 53 observations.
X X
CRZ
Volunteer tree. Codominant trunk stem at root crown. Sever invasive vine. Tree is off-site.
Tree stem 54 is one of the multitrunk stems as discribed in tree 53 observations.
1
Size
Paulownia tomentosa, Royal Paulownia
73
Volunteer tree. 5-trunk stems at root crown. Invasive vine is attached up trunk stem and through canopy. V-poor scaffold branching. Tree is off-site. Volunteer tree. Tree has 4-trunk stems at the root crown w/ low union angle. Invasive vine is attached up trunk stem and through canopy. Tree stem 52 is one of the multitrunk stems as discribed in tree 53 observations.
0
Paulownia tomentosa, Royal Paulownia
49
Voluntreer tree. CLF & metal post embedded into trunk stem. V-poor scaffold branching. Codominant trunk stem at 4VF. Shows previous storm damage. Volunteer tree. V-poor scaffold branching & symmetry. Tree shows previous storm damage.
1
5, 4, 5, 5, 4
51
Volunteer tree. E. Ivy embedded on trunk stem & up/through canopy. Codominant trunk stems at ~ 10VF.
1
Morus alba, White Mulberry
42
Volunteer tree w/codominant trunk stem at root rown. CLF embedded in trunk stem. Severe invasive vine attached. Poor scaffold branching. Volunteer tree. V-poor scaffold branching. Invasive vine attached all through canopy. Tree located between wood board fence & iron fence.
0
Species
Crown Reduction
%
Tree #
Existing Tree Condition Observations
Crown Clean
Activites
Tree Protection
Replacement trees
Root Prune
Status
Remove Invasive
R (ft)
Canopy Position Total Score
Crown Raising
*DBH (in)
Field Species Condition Rating
Crown Reduction
CRZ
Crown Clean
Size
Tree Protection
Species
Root Prune
Tree #
Remove
Computed Replacement Tree Total:
Volunteer tree. CLF is embeded into lower trunk stem. Severe invasive vine is attached up and through canopy. New planting. No apparent biotic issues. Good color, vigor and vitality. Tree is off-site. Volunteer tree. Severe invasive vine. Codominant trunk stems at 4VF. Page wire fencing is embedded into trunk stem. Tree is off-site. New planting. No apparent biotic issues. Invasives from adjacent vegetation is migrating to tree 69. Tree is off-site. Tree shows good color, vigor & vitality. Invasive vine is attached at lower & mid trunk stem. Tree is rooted at CLF. Not embedded. New planting with development improvements. No apparent biotic issues. Good symmetry and scaffold branching.
9
DBH = Diameter at Breast Height (measured 4.5 feet above existing grade or as noted).
*
= Diameter measurement as recorded at the root crown where tree has a codominant, or mulit-stem trunk which precludes a measurement at 4.5 ft above existing grade.
** = Existing tree is Off-Site. Removal of this tree will require permission from the adjacent property owner. CRZ = Critical Root Zone (1 foot of radius per inch of tree diameter) CRZ for trees with multiple stems were calculated based on the diameter of a tree with the basal area equal to the sum of the basal areas for all stems measured.
Conditions Ratings provided as percentages as based on methods outlined in the 9th edition of the "Guide for Plant Appraisal", published by the International Socielty of Arboriculture.
ARLINGTON COUNTY STORMWATER DETENTION CALCULATION 7. 1. SITE DESCRIPTION: 6881 Lee Highway (Shreve Oil) ENTER 1 FOR FOUR MILE WATERSHED OR 2 FOR POTOMAC WATERSHED: 1 LOCATION:
STORAGE PROVIDED: AVAILABLE STORAGE VOLUME
A) 55' X 20' X 7.5'
2.21
150.00
SF
d= D=
10.00 6.00
FT FT
D/d =
0.60
d = D =
FOUR MILE RUN WATERSHED
TOTAL AREA =
Vault
Ac.
EASEMENT FOR PUBLIC STREET AND SIDEWALK = AREA REQUIRED FOR DETENTI EXISTING CONDITION: BUILDINGS AND ASPHALT IMPERVIOUS AREA = PERVIOUS AREA =
2.21
0.00
Ac.
B)
Ac.
1.35
X 0.9 +
0.86
X 0.30
1.35 0.86
PARTIAL FLOW AREA = =
6.000 90.00
SF
% USABLE AREA = (B/A)
90.00
SF
=
2.21 TOTAL AREA =
2.21
COMPOSITE "C" =
0.66
AVERAGE VOLUME = (1 +
0.600 80.00%
THEREFORE REQUIRED VOLUME =
PROPOSED CONDITION 1.94
X 0.9 +
0.27
2.21 TOTAL AREA =
2.21
COMPOSITE "C" =
0.83
8. TIME OF CONSENTRATION = 5 MIN. RAINFALL INTENSITY I10= = 7.30 I100= 10.00
PREDEVELOPED RUN-OFF: C = 0.30 (SPECIFIED BY ORDINANCE) C = 0.48 BY PARTIAL WAIVER Q10 = 7.74 CFS
3.
UNDETAINED FLOW : UNDETAINED AREA = UNDETAINED "C" POST DEV Q100 =
0.12 0.29 0.55 1.59
/
150.00
SF
) / 2 TOTAL USEABLE VOLUME 5292 6615
CF CF
CORRESPONDING VAULT LENGTH = =
6615 44
CF LF
/
0.800
/
150.00
SF
ORIFICE Q = C*A* SQ.RT.(2*G*H) --- SIZE THE ORIFICE TO ACCOMMODATE Q ALLOWABLE. WHERE: ORIFICE = 9.75 IN DIA THUS: Q PROV.= 6.13 CFS A = 0.520 SF Q ALLOW.= 6.15 CFS G = 32.20 H = 6.00 FT -- THEREFORE DESIGN ACCEPTABLE C = 0.60
IN/HR IN/HR
2.
15.00
=
X 0.30
1.94 0.27
X
0.600
=
IMPERVIOUS AREA = PERVIOUS AREA =
Vault Depth Storage Depth
X 0.9 +
0.17
X 0.30
0.00
X 0.30
9.
AC. CFS
EMERGENCY SPILLWAY SIZE THE EMERGENCY SPILLWAY TO ACCOMMODATE THE POST-DEVELOPED Q100, ASSUMING THE ORIFICE IS CLOGGED.
0.29
Q = C*L*H^(3/2) 4.
PUBLIC ACCESS EASEMENT AREA PASSING THRU THE DETENTION FACILITY UNDETAINED AND OFF-SITE AREA UNDETAINED.
0.00
X 0.9 +
WHERE: 0
EASEMENT EASEMENT OFF-SITE OFF-SITE
AREA = "C" POST DEV.= AREA = "C" POST DEV.=
0.00 0.00 0.00 0.00
0.00
X 0.9 +
0.00
X 0.30
Q 100 = C= HEAD = L =
CAPACITY =
16.68 3.00 1.50 8.00 3.00
CFS FOR BR. CRESTED WEIR FT FT X
0 Q100 = Q100 = 5.
6.
0.00 0.00
*
10.00
IN/HR
*
0
Ac.
CFS
THEREFORE DESIGN IS ACCEPTABLE
ALLOWABLE RELEASE RATE: Q ALLOWABLE = (Q10) PRE - (Q100) POST UNDETAINED FROM #3 Q ALLOWABLE = 7.74 1.59 = 6.15 ACTUAL RELEASE RATE 6.13 STORAGE VOLUME REQUIRED: DETAINED AREA = 1.920 AC. 1.82 AC. * 0.90 = 1.64 0.10 AC. * 0.30 = 0.03
TOTAL A*C = COMPOSITE "C" = TIME (MIN.) 5 10 15 20 25 30 35 40 50 60 90 120 180
TIME (SEC.) 300 600 900 1200 1500 1800 2100 2400 3000 3600 5400 7200 10800
1.668
CFS CFS
IMPERVIOUS AC.
0.86 I 100 (IN/HR) 10.00 8.10 7.20 6.30 5.70 5.20 4.80 4.30 3.70 3.50 2.65 2.30 1.65
IMP. AC. (A*C) 1.668 1.668 1.668 1.668 1.668 1.668 1.668 1.668 1.668 1.668 1.668 1.668 1.668
Q 100 (CFS) 16.680 13.511 12.010 10.508 9.508 8.674 8.006 7.172 6.172 5.838 4.420 3.836 2.752
VOL.IN (CF) 5004 8106 10809 12610 14261 15612 16813 17214 18515 21017 23869 27622 29724
DISCHARGE (CFS) 6.13 6.13 6.13 6.13 6.13 6.13 6.13 6.13 6.13 6.13 6.13 6.13 6.13
VOL. (CF) 1,839 3,678 5,517 7,356 9,195 11,034 12,873 14,712 18,390 22,068 33,102 44,136 66,204
****** DISCHARGE BASED ON ACTUAL ORIFICE RATE OF FLOW ****** CONCLUSION: MAX. STORAGE --5292 C.F. AT 15 MIN. (100 - YEAR)
STORAGE (CF) 3,165 4,428 5,292 5,254 5,066 4,578 3,940 2,502 125 (1,051) (9,233) (16,514) (36,480)
5 10 15 20 25 30 35 40 50 60 90 120 180
7.3 5.9 5.1 4.5 4 3.71 3.35 3.15 2.73 2.3 1.9 1.48 1.1
10 8.1 7.2 6.3 5.7 5.2 4.8 4.3 3.7 3.5 2.65 2.3 1.65
8.00
FT
X
1.50
FT
^1.5=
44.09
