HomeMy WebLinkAboutWPO201800007 Calculations 2018-04-16BLOSSOM
CONSULTING &
ENGINEERING
RIVANNA VILLAGE — AMENDMENT 1 AND PHASE II
Stormwater Management Plan — Supplemental Calculations
WPO201800007
Albemarle County, Virginia
Date: March 2, 2018
Revised: April 16, 2018
Prepared for:
County of Albemarle
Department of Community Development
401 Mchitire Road, Room 227
Charlottesville, VA 22902-4596
c/o Mr. Bobby Jocz
Prepared by:
Blossom Consulting and Engineering, Inc.
1101 Professional Drive, Suite G
Williamsburg, Virginia23185
(757)870-4825
scott9blossomconsulting.net
APPROVED
by the Albemarle County
Community Development Department
Date 05/09/2018
File WP0201800007
Rivanna Village — Amendment t and Phase II
Stormwater Management Plan — Supplemental Calculations
INTRODUCTION
As requested by the Robinson Development Group (RDG) (Client), Blossom
Consulting and Engineering, Inc. (BCE) prepared a Stormwater Management Plan, an Erosion
and Sediment Control Plan, and a Buffer Mitigation Plan for Phase II of the Rivanna Village
development, including amendments to a portion of the previously submitted Phase I plans.
This calculations booklet is being provided in response to comments received from Albemarle
County dated January 17, 2018 for the project (WP02Oi800007). This report includes
supplemental stormwater and erosion and sediment control calculations and design
information for the project.
Routing of proposed BMPs was completed in Bentley Systems Inc. (Haested Method's)
Pond Pack software, which uses TR-55 methodology and level pool routing with detailed
outfall structure definitions. Principle and emergency spillways associated with the proposed
BMPs were routed to calculate pre and post development peak flow rates, volumes and
associated water surface elevations. Hydrograph volumes and associated peak flow rates are
provided for modelled drainage areas and hydrologic node locations shown on Sheets SWM-
23 and SWM-24.
As required by Virginia State stormwater regulations, water quality calculations were
completed using the Virginia Runoff Reduction Methodology (VRRM). Associated VRRM
calculations are provided herein. VRRM calculations were completed for the entire site area
(9o.6 acres) and include previously approved Phase I BMPs as well as proposed Phase II
BMPs.
In addition, as requested by Albemarle County, an example Maintenance Agreement
and Deed Restriction is provided. Proposed BMP Maintenance Easements and Forest/Open
Space Easements are depicted on Sheet SWM-25. Easements and associated restrictive
covenants shall be recorded prior to plan approval.
Specifically, this report includes the following:
• Appendix A: Pondpack Master Network Summary
o Pre -Development
o Post -Development
• AppendixB: BMP Stage -Storage
• Appendix C: VRRM Spreadsheets
• Appendix D: Erosion and Sediment Control Data
o Outlet Structure Data (SBh and SBI2)
o ESC facility Routing Summary (SBh and SBI2)
0 Appendix E: Example Deed restriction and Maintenance Agreements
Rivanna Village — Amendment t and Phase II
Stormwater Management Plan — Supplemental Calculations
Appendix A — Pond Pack Master Network Summary (Pre -Development)
2
Subsection: Master Network Summary
Catchments Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event volume (hours) (ft3/s)
(years) (ac-ft)
4A
Post -Development 1-
1
2.712
12.040
41.56
4A
Post
R -Development 2-
2
3.880
12.020
60.34
4A
Post -Development 10
10
7.735
12.010
121.18
4A
Post -Development 25
25
10.527
12.010
164.16
4A
Post -Development
100
15.799
12.010
243.18
100-YR
5
Post
R -Development 1-
1
2.107
12.140
23.87
5
Post
R -Development 2-
2
3.070
12.140
35.84
5
Post -Development 10
10
6.300
12.100
75.76
5
Post -Development 25
25
8.668
12.100
104.58
5
Post -Development
100
13.170
12.100
158.24
100-YR
48
Post
R -Development 1-
1
0.587
12.070
7.44
48
Post
R -Development 2-
2
0.883
12.070
11.76
48
Post -Development 10
10
1.903
12.060
26.39
48
Post -Development 25
25
2.666
12.060
37.13
48
Post -Development
100
4.134
12.060
57.35
100-YR
38
Post
R -Development 1-
1
0.778
12.050
11.50
38
Post
R -Development 2-
2
1.126
12.030
16.93
38
Post -Development 10
10
2.285
12.020
34.82
38
Post -Development 25
25
3.130
12.020
47.58
38
Post -Development
100
4.733
12.020
71.18
100-YR
3A
Post
R -Development 1-
1
1.998
12.040
29.37
3A
Post
R -Development 2-
2
2.970
12.030
44.97
3A
Post -Development 10
10
6.286
12.010
97.29
3A
Post -Development 25
25
8.747
12.010
135.67
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Subsection: Master Network Summary
Catchments Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Event
Volume
(hours)
(fta/s)
(years)
(ac-ft)
3A
Post -Development
100
13.465
12.010
207.50
100-YR
2
Post
R -Development 1-
1
2.632
12.020
39.97
2
Post
R -Development 2-
2
3.841
12.020
59.79
2
Post -Development 10
10
7.900
12.020
124.61
2
Post -Development 25
25
10.878
12.020
170.86
2
Post -Development
100
16.545
12.020
256.52
100-YR
1
Post
R -Development 1-
1
1.303
12.050
18.26
1
Post
R -Development 2-
2
1.944
12.050
28.26
1
Post -Development 10
10
4.139
12.030
61.72
1
Post -Development 25
25
5.773
12.030
86.29
1
Post -Development
100
8.910
12.020
132.37
100-YR
6
Post
R -Development 1-
1
0.504
12.040
7.57
6
Post
R -Development 2-
2
0.752
12.020
11.66
6
Post -Development 10
10
1.600
12.020
25.38
6
Post -Development 25
25
2.231
12.010
35.33
6
Post -Development
100
3.441
12.010
54.03
100-YR
7
Post
R -Development 1-
1
0.570
12.100
7.12
7
Post
R -Development 2-
2
0.859
12.070
11.20
7
Post -Development 10
10
1.857
12.060
25.39
7
Post -Development 25
25
2.604
12.060
35.82
7
Post -Development
100
4.043
12.060
55.48
100-YR
A
Post
R -Development 1-
1
0.205
12.080
2.68
A
Post
R -Development 2-
2
0.297
12.070
3.99
A
Post -Development 10
10
0.605
12.070
8.28
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Subsection: Master Network Summary
Catchments Summary
Label Scenario
Return
Hydrograph
Time to Peak Peak Flow
Event
Volume
(hours) (fta/s)
(years)
(ac-ft)
A Post -Development 25
25
0.830
12.070 11.34
A Post -Development
100
1.256
12.070 17.01
100-YR
Node Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event Volume (hours) (fta/s)
(years) (ac-ft)
OUT
Post
R -Development 1-
1
13.396
12.040
184.48
OUT
Post
R -Development 2-
2
19.622
12.040
278.21
OUT
Post -Development 10
10
40.608
12.030
586.81
OUT
Post -Development 25
25
56.055
12.030
809.37
OUT
Post -Development
100
85.497
12.020
1,225.14
100-YR
J-4A
Post
R -Development 1-
1
2.712
12.040
41.56
J-4A
Post
R -Development 2-
2
3.880
12.020
60.34
J-4A
Post -Development 10
10
7.735
12.010
121.18
J-4A
Post -Development 25
25
10.527
12.010
164.16
J-4A
Post -Development
100
15.799
12.010
243.18
100-YR
J 38
Post
R -Development 1-
1
0.778
12.050
11.50
J-38
Post
R -Development 2-
2
1.126
12.030
16.93
J 38
Post -Development 10
10
2.285
12.020
34.82
J-38
Post -Development 25
25
3.130
12.020
47.58
J-38
Post -Development
100
4.733
12.020
71.18
100-YR
J 5
Post
R -Development 1-
1
2.107
12.140
23.87
J 5
Post
R -Development 2-
2
3.070
12.140
35.84
3-5
Post -Development 10
10
6.300
12.100
75.76
J 5
Post -Development 25
25
8.668
12.100
104.58
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Subsection: Master Network Summary
Node Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Event
Volume
(hours)
(fta/S)
(years)
(ac-ft)
J-5
Post -Development
100
13.170
12.100
158.24
100-YR
6
Post
R -Development 1-
1
0.504
12.040
7.57
6
Post
R -Development 2-
2
0.752
12.020
11.66
J-6
Post -Development 10
10
1.600
12.020
25.38
J-6
Post -Development 25
25
2.231
12.010
35.33
J-6
Post -Development
100
3.441
12.010
54.03
100-YR
J-1
Post
R -Development 1-
1
1.303
12.050
18.26
1
Post
R -Development 2-
2
1.944
12.050
28.26
J-1
Post -Development 10
10
4.139
12.030
61.72
J-1
Post -Development 25
25
5.773
12.030
86.29
J-1
Post -Development
100
8.910
12.020
132.37
100-YR
J-2
Post
R -Development 1-
1
2.632
12.020
39.97
J-2
Post
R -Development 2-
2
3.841
12.020
59.79
J-2
Post -Development 10
10
7.900
12.020
124.61
J-2
Post -Development 25
25
10.878
12.020
170.86
2
Post -Development
100
16.545
12.020
256.52
100-YR
3-A
Post
R -Development 1-
1
6.280
12.040
92.01
3-A
Post
R -Development 2-
2
9.156
12.040
137.11
3-A
Post -Development 10
10
18.813
12.020
285.77
3-A
Post -Development 25
25
25.900
12.020
392.66
3-A
Post -Development
100
39.387
12.010
591.54
100-YR
3-413
Post
R -Development 1-
1
3.299
12.040
48.63
3-413
Post
R -Development 2-
2
4.763
12.040
71.40
3-413
Post -Development 10
10
9.638
12.020
145.88
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Subsection: Master Network Summary
Node Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Event
Volume
(hours)
(fta/S)
(years)
(ac-ft)
3-413
Post -Development 25
25
13.193
12.020
198.95
3-413
Post -Development
100
19.933
12.010
297.39
100-YR
J 3A
Post
R -Development 1-
1
2.777
12.040
40.83
J 3A
Post
R -Development 2-
2
4.096
12.030
61.89
J 3A
Post -Development 10
10
8.570
12.020
132.10
J 3A
Post -Development 25
25
11.878
12.020
182.96
3-3A
Post -Development
100
18.198
12.010
278.21
100-YR
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Appendix A — Pond Pack Master Network Summary (Post -Development)
Subsection: Master Network Summary
Catchments Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event volume (hours) (k3/s)
(years) (ark)
1
Post -Development 1-
1
1.407
12.050
20.04
2
Post
R -Development 1-
1
2.712
12.020
41.64
3A
Post
R -Development 1-
1
2.606
12.030
40.10
30
Post
R -Development 1-
1
0.782
12.050
11.57
4A
Post
R -Development 1-
1
2.514
12.040
38.23
40
Post
R -Development 1-
1
0.796
12.070
10.55
5
Post
R -Development 1-
1
2.532
12.150
29.15
5A
Post
R -Development 1-
1
0.472
11.990
7.90
513
Post
R -Development 1-
1
0.584
12.060
7.92
6
Post
R -Development 1-
1
0.647
12.020
10.08
7
Post
R -Development 1-
1
0.724
12.070
9.54
Node Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event volume (hours) (k3/s)
(years) (ark)
1
Post
R -Development 1-
1
1.407
12.050
20.04
J-2
Post
R -Development 1-
1
2.712
12.020
41.64
J-3A
Post
R -Development 1-
1
3.388
12.030
51.61
J 30
Post
R -Development 1-
1
0.782
12.050
11.57
J-4A
Post
R -Development 1-
1
2.514
12.040
38.23
J-413
Post
R -Development 1-
1
3.310
12.040
48.37
J 5
Post
R -Development 1-
1
1.056
12.030
15.14
J 5A
Post
R -Development 1-
1
0.472
11.990
7.90
J 6
Post
R -Development 1-
1
0.647
12.020
10.08
J-A
Post
R -Development 1-
1
8.092
12.420
34.17
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Subsection: Master Network Summary
Node Summary
Label Scenario Return
Event
(years)
OUT YR -Development 1- 1
Pond Summary
Label Scenario Return Hydrograph
Event Volume
(years) (ac-ft)
Hydrograph
Volume
(ac-ft)
14.639
Time to Peak
(hours)
Time to Peak Peak Flow
(hours) (ft3/S)
12.050
Peak Flow
(fta/S)
102.71
Maximum
Maximum
Water
Pond Storage
Surface
(ac-ft)
Elevation
(ft)
Post-
BMP Il (IN)
Development
1
9.230
12.040
125.25
(N/A)
(N/A)
1-YR
BMP Il
Post
(DM
Development
1
8.092
12.420
34.17
342.42
7.756
1-YR
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Subsection: Master Network Summary
Catchments Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event volume (hours) (k3/s)
(years) (ark)
1
Post -Development 2-
2
2.094
12.050
30.71
2
Post
R -Development 2-
2
4.041
12.020
63.37
3A
Post
R -Development 2-
2
3.705
12.010
57.35
38
Post
R -Development 2-
2
1.131
12.030
17.00
4A
Post
R -Development 2-
2
3.643
12.020
56.35
48
Post
R -Development 2-
2
1.199
12.070
16.40
5
Post
R -Development 2-
2
3.445
12.150
39.77
5A
Post
R -Development 2-
2
0.667
11.980
11.26
513
Post
R -Development 2-
2
0.896
12.060
12.57
6
Post
R -Development 2-
2
0.927
12.020
14.64
7
Post
R -Development 2-
2
1.041
12.060
14.08
Node Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event volume (hours) (ka/s)
(years) (ark)
1
Post
R -Development 2-
2
2.094
12.050
30.71
J-2
Post
R -Development 2-
2
4.041
12.020
63.37
J 3A
Post
R -Development 2-
2
4.836
12.030
74.35
J-38
Post
R -Development 2-
2
1.131
12.030
17.00
J-4A
Post
R -Development 2-
2
3.643
12.020
56.35
J-413
Post
R -Development 2-
2
4.842
12.040
72.20
J 5
Post
R -Development 2-
2
1.563
12.020
22.87
J 5A
Post
R -Development 2-
2
0.667
11.980
11.26
J 6
Post
R -Development 2-
2
0.927
12.020
14.64
J-A
Post
R -Development 2-
2
11.793
12.250
84.17
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Subsection: Master Network Summary
Node Summary
Label Scenario Return
Event
(years)
OUT YR -Development 2- 2
Pond Summary
Label Scenario Return Hydrograph
Event Volume
(years) (ac-ft)
Hydrograph
Volume
(ac-ft)
21.459
Time to Peak
(hours)
Time to Peak Peak Flow
(hours) (ft3/S)
12.100
Peak Flow
(fta/S)
171.92
Maximum
Maximum
Water
Pond Storage
Surface
(ac-ft)
Elevation
(ft)
Post-
BMP Il (IN)
Development
2
13.123
12.040
181.38
(N/A)
(N/A)
2-YR
BMP Il
Post
(DM
Development
2
11.793
12.250
84.17
342.90
8.637
2-YR
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Subsection: Master Network Summary
Catchments Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event volume (hours) (k3/s)
(years) (ark)
1
PyoR -Development 10
10
4.419
12.030
66.03
2
Post -Development 10
10
8.312
12.020
130.74
3A
Post -Development 10
10
7.197
12.010
111.08
38
Post -Development 10
10
2.290
12.020
34.90
4A
Post -Development 10
10
7.411
12.010
116.17
48
Post -Development 10
10
2.515
12.060
35.03
5
Post -Development 10
10
6.320
12.100
72.37
5A
Post -Development 10
10
1.302
11.970
22.01
513
Post -Development 10
10
1.899
12.060
27.04
6
Post -Development 10
10
1.849
12.010
29.27
7
Post -Development 10
10
2.093
12.060
28.80
Node Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event volume (hours) (ka/s)
(years) (ark)
1
Post -Development 10
10
4.419
12.030
66.03
J-2
Post -Development 10
10
8.312
12.020
130.74
J 3A
Post -Development 10
10
9.487
12.010
145.61
J-38
Post -Development 10
10
2.290
12.020
34.90
J-4A
Post -Development 10
10
7.411
12.010
116.17
J-413
Post -Development 10
10
9.926
12.020
149.52
J 5
Post -Development 10
10
3.201
12.020
47.15
J 5A
Post -Development 10
10
1.302
11.970
22.01
J 6
Post -Development 10
10
1.849
12.010
29.27
J-A
Post -Development 10
10
23.853
12.140
271.08
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Subsection: Master Network Summary
Node Summary
Label Scenario Return
Event
(years)
R -Development 10
OUT P 10
Pond Summary
Label Scenario Return Hydrograph
Event Volume
(years) (ac-ft)
Hydrograph
Volume
(ac-ft)
43.727
Time to Peak
(hours)
Time to Peak Peak Flow
(hours) (ft3/S)
12.070
Peak Flow
(fta/S)
526.30
Maximum
Maximum
Water
Pond Storage
Surface
(ac-ft)
Elevation
(ft)
Post-
BMP Il (IN)
Development
10
25.733
12.040
358.31
(N/A)
(N/A)
10-YR
BMP Il
Post
(DM
Development
10
23.853
12.140
271.08
344.02
10.817
10-YR
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1/22/2018 27 Siemon Company Drive Suite 200 W Page 2 of 2
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Subsection: Master Network Summary
Catchments Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event Volume (hours) (ft3/s)
(years) (ac-ft)
4A
Post -Development 1-
1
2.516
12.040
38.27
4A
Post
R -Development 2-
2
3.646
12.020
56.41
4A
Post -Development 10
10
7.416
12.010
116.25
4A
Post -Development 25
25
10.170
12.010
158.95
4A
Post -Development
100
15.393
12.010
237.91
100-YR
5
Post
R -Development 1-
1
2.532
12.150
29.15
5
Post
R -Development 2-
2
3.445
12.150
39.77
5
Post -Development 10
10
6.320
12.100
72.37
5
Post -Development 25
25
8.337
12.100
94.88
5
Post -Development
100
12.071
12.100
135.61
100-YR
5A
Post
R -Development 1-
1
0.472
11.990
7.90
5A
Post
R -Development 2-
2
0.667
11.980
11.26
5A
Post -Development 10
10
1.302
11.970
22.01
5A
Post -Development 25
25
1.758
11.970
29.51
5A
Post -Development
100
2.614
11.970
43.24
100-YR
48
Post
R -Development 1-
1
1.001
12.070
13.71
48
Post
R -Development 2-
2
1.406
12.060
19.49
48
Post -Development 10
10
2.721
12.060
37.83
48
Post -Development 25
25
3.662
12.060
50.60
48
Post -Development
100
5.426
12.060
73.92
100-YR
38
Post
R -Development 1-
1
0.783
12.050
11.58
38
Post
R -Development 2-
2
1.132
12.030
17.02
38
Post -Development 10
10
2.292
12.020
34.92
38
Post -Development 25
25
3.138
12.020
47.69
005_ph2swtn_POST_100YRrouted_20171110.pp Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i
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Subsection: Master Network Summary
Catchments Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Event
Volume
(hours)
(fta/s)
(years)
(ac-ft)
38
Post -Development
100
4.741
12.020
71.27
100-YR
3A
Post
R -Development 1-
1
3.020
12.030
46.74
3A
Post
R -Development 2-
2
4.126
12.010
64.01
3A
Post -Development 10
10
7.620
12.010
117.01
3A
Post -Development 25
25
10.076
12.010
153.16
3A
Post -Development
100
14.631
12.010
218.46
100-YR
2
Post
R -Development 1-
1
3.398
12.020
53.35
2
Post
R -Development 2-
2
4.731
12.020
74.64
2
Post -Development 10
10
9.017
12.020
141.02
2
Post -Development 25
25
12.067
12.010
186.81
2
Post -Development
100
17.763
12.000
270.76
100-YR
1
Post
R -Development 1-
1
1.514
12.050
21.82
1
Post
R -Development 2-
2
2.205
12.050
32.49
1
Post -Development 10
10
4.519
12.030
67.54
1
Post -Development 25
25
6.215
12.030
92.73
1
Post -Development
100
9.439
12.020
139.58
100-YR
5B
Post
R -Development 1-
1
0.796
12.060
11.25
5B
Post
R -Development 2-
2
1.109
12.060
15.78
5B
Post -Development 10
10
2.113
12.060
29.93
5B
Post -Development 25
25
2.828
12.060
39.70
5B
Post -Development
100
4.163
12.050
57.52
100-YR
6
Post
R -Development 1-
1
0.647
12.020
10.08
6
Post
R -Development 2-
2
0.927
12.020
14.64
6
Post -Development 10
10
1.849
12.010
29.27
005_ph2swtn_POST_100YRrouted_20171110.pp
Bentley
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Haestad Methods Solution
Bentley PondPack
Val
c
Center
[08.11.01.561
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Drive Suite 200 W
Page
2 of 6
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Subsection: Master Network Summary
Catchments Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Event
Volume
(hours)
(fta/s)
(years)
(ac-ft)
6
Post -Development 25
25
2.517
12.010
39.62
6
Post -Development
100
3.780
12.000
58.72
100-YR
7
Post
R -Development 1-
1
0.724
12.070
9.54
7
Post
R -Development 2-
2
1.041
12.060
14.08
7
Post -Development 10
10
2.093
12.060
28.80
7
Post -Development 25
25
2.858
12.060
39.24
7
Post -Development
100
4.304
12.060
58.52
100-YR
Node Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event Volume (hours) (fta/s)
(years) (ac-ft)
OUT
Post
R -Development 1-
1
16.245
12.040
119.97
DUf
Post
R -Development 2-
2
23.087
12.090
198.86
DUf
Post -Development 10
10
45.368
12.060
550.13
DUf
Post -Development 25
25
61.305
12.060
780.33
DUf
Post -Development
100
91.455
12.050
1,198.05
100-YR
J-4A
Post
R -Development 1-
1
2.516
12.040
38.27
J-4A
Post
R -Development 2-
2
3.646
12.020
56.41
J-4A
Post -Development 10
10
7.416
12.010
116.25
J-4A
Post -Development 25
25
10.170
12.010
158.95
J-4A
Post -Development
100
15.393
12.010
237.91
100-YR
J 38
Post
R -Development 1-
1
0.783
12.050
11.58
J-38
Post
R -Development 2-
2
1.132
12.030
17.02
J-38
Post -Development 10
10
2.292
12.020
34.92
J-38
Post -Development 25
25
3.138
12.020
47.69
005_ph2swtn_POST_100YRrouted_20171110.pp Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack Val
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Subsection: Master Network Summary
Node Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Event
Volume
(hours)
(fta/S)
(years)
(ac-ft)
J 38
Post -Development
100
4.741
12.020
71.27
100-YR
5
Post
R -Development 1-
1
1.269
12.030
18.52
5
Post
R -Development 2-
2
1.776
12.020
26.15
5
Post -Development 10
10
3.415
12.020
50.16
5
Post -Development 25
25
4.586
12.020
66.80
J-5
Post -Development
100
6.777
12.020
97.12
100-YR
6
Post
R -Development 1-
1
0.647
12.020
10.08
6
Post
R -Development 2-
2
0.927
12.020
14.64
6
Post -Development 10
10
1.849
12.010
29.27
J-6
Post -Development 25
25
2.517
12.010
39.62
J-6
Post -Development
100
3.780
12.000
58.72
100-YR
1
Post
R -Development 1-
1
1.514
12.050
21.82
1
Post
R -Development 2-
2
2.205
12.050
32.49
1
Post -Development 10
10
4.519
12.030
67.54
J-1
Post -Development 25
25
6.215
12.030
92.73
J-1
Post -Development
100
9.439
12.020
139.58
100-YR
J-2
Post
R -Development 1-
1
3.398
12.020
53.35
J-2
Post
R -Development 2-
2
4.731
12.020
74.64
J-2
Post -Development 10
10
9.017
12.020
141.02
J-2
Post -Development 25
25
12.067
12.010
186.81
J-2
Post -Development
100
17.763
12.000
270.76
100-YR
3-A
Post
R -Development 1-
1
8.693
12.360
42.57
3-A
Post
R -Development 2-
2
12.407
12.230
94.83
3-A
Post -Development 10
10
24.475
12.140
280.55
005_ph2swrn_POST_100YRrouted_20171110.pp
Bentley
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Haestad Methods Solution
Bentley PondPack
V8i
c
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[08.11.01.561
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Siemon Company
Drive Suite 200 W
Page
4 of 6
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Subsection: Master Network Summary
Node Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Event
Volume
(hours)
(fta/S)
(years)
(ac-ft)
J-A
Post -Development 25
25
33.062
12.110
405.90
A
Post -Development
100
49.394
12.100
628.65
100-YR
J 48
Post
R -Development 1-
1
3.517
12.040
51.62
JAB
Post
R -Development 2-
2
5.053
12.040
75.39
J 46
Post -Development 10
10
10.137
12.020
152.46
3-413
Post -Development 25
25
13.832
12.020
207.36
3-46
Post -Development
100
20.819
12.010
308.60
100-YR
J-3A
Post
R -Development 1-
1
3.803
12.030
58.26
J 3A
Post
R -Development 2-
2
5.258
12.020
80.85
J-3A
Post -Development 10
10
9.912
12.010
151.56
J 3A
Post -Development 25
25
13.214
12.010
200.43
J-3A
Post -Development
100
19.372
12.010
289.27
100-YR
J 5A
Post
R -Development 1-
1
0.472
11.990
7.90
J 5A
Post
R -Development 2-
2
0.667
11.980
11.26
J_5A
Post -Development 10
10
1.302
11.970
22.01
3_5A
Post -Development 25
25
1.758
11.970
29.51
J-5A
Post -Development
100
2.614
11.970
43.24
100-YR
Pond Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow Maximum Maximum
Event Volume (hours) (fta/S) Water Pond Storage
(years) (ac-ft) Surface (ac-ft)
Elevation
(ft)
post-
Il (IN)
Development
1
9.853
12.040
135.02
(N/A)F7.(N/
A)BMP
1-YR
BMP Il
post-
(DUF)
Development
1
8.693
12.360
42.57
342.52927
1-YR
005_ph2swrn_POST_100YRrouted_20171110.pp Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i
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Subsection:
Master Network Summary
Pond Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Maximum
Maximum
Event
Volume
(hours)
(ft3/S)
Water
Pond Storage
(years)
(ac-ft)
Surface
(ac-ft)
Elevation
(fit)
Poi
BMP Il (IN)
Development
2
13.756
12.040
190.86
(N/A)
(N/A)
2-YR
BMP Il
Post
(DUFF)
Development
2
12.407
12.230
94.83
342.98
8.796
2-YR
Poi
BMP Il (IN)
Development
10
26.369
12.040
366.76
(N/A)
(N/A)
10-YR
BMP Il
Post
(DUFF)
Development
10
24.475
12.140
280.55
344.07
10.915
10-YR
Poi
BMP Il (IN)
Development
25
35.383
12.030
489.66
(N/A)
(N/A)
25-YR
BMP Il
Post
(DUFF)
Development
25
33.062
12.110
405.90
344.60
12.015
25-YR
Poi
BMP Il (IN)
Development
100
52.262
12.030
714.31
(N/A)
(N/A)
100-YR
BMP I1
Poi
(DUFF)
Development
Development
100
49.394
12.100
628.65
345.30
13.586
005_ph2swm_POST_100YRrouted_20171110.pp Bentley Systems, Inc. Haestad Methods Solution Bentley PondPecl( V8i
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Appendix A — Pond Pack Master Network Summary (BMP Post -Development Routing)
Subsection: Master Network Summary
Catchments Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event volume (hours) (ft3/s)
(years) (ac-ft)
DA-G1
Post -Development 1-
1
0.304
11.920
5.73
DA-G1
Post
R -Development 2-
2
0.400
11.920
7.47
DA-G1
Post
R -Development 5-
5
0.555
11.920
10.24
DA-G1
Ps -Development 10
10
0.691
11.920
12.60
DA-G1
Post -Development 25
25
0.891
11.920
16.03
DA-G1
Post -Development 50
50
1.065
11.920
18.96
DA-G1
Post -Development
100
1.257
11.920
22.16
100-YR
DA-G2
Post
R -Development 1-
1
0.052
11.920
0.98
DA-G2
Post
R -Development 2-
2
0.070
11.920
1.32
DA-G2
Post
R -Development 5-
5
0.100
11.920
1.88
DA-G2
Post -Development 10
10
0.127
11.920
2.36
DA-G2
Post -Development 25
25
0.166
11.920
3.06
DA-G2
Post -Development 50
50
0.201
11.920
3.67
DA-G2
Post -Development
100
0.240
11.920
4.33
100-YR
DA-G3
Post
R -Development 1-
1
0.133
11.920
2.51
DA-G3
Post
R -Development 2-
2
0.177
11.920
3.33
DA-G3
Post
R -Development 5-
5
0.250
11.920
4.65
DA-G3
Post -Development 10
10
0.313
11.920
5.78
DA-G3
Post -Development 25
25
0.407
11.920
7.42
DA-G3
Post -Development 50
50
0.490
11.920
8.83
DA-G3
Post -Development
100
0.581
11.920
10.37
100-YR
DA4243
Post
R -Development 1-
1
0.487
12.010
7.97
DA-I2-I3
Post -Development 2-
2
0.673
11.990
11.04
YR
DA4243
Post
R -Development 5-
5
0.987
11.990
16.15
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Subsection: Master Network Summary
Catchments Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Event
Volume
(hours)
(ft3/s)
(years)
(ac-ft)
DA4243
Post -Development 10
10
1.267
11.990
20.60
DA4243
Post -Development 25
25
1.687
11.990
27.16
DA4243
Post -Development 50
50
2.058
11.990
32.84
DA4243
Post -Development
100
2.470
11.980
39.07
100-YR
DA-I4a
Post
R -Development 1-
1
0.090
11.930
1.70
DA-I4a
Post
R -Development 2-
2
0.126
11.920
2.38
DA-I4a
Post
R -Development 5-
5
0.186
11.920
3.52
DA-I4a
Post -Development 10
10
0.240
11.920
4.52
DA-I4a
Post -Development 25
25
0.321
11.920
6.00
DA-I4a
Post -Development 50
50
0.393
11.920
7.29
DA-I4a
Post -Development
100
0.473
11.920
8.70
100-YR
DA-31a
Post
R -Development 1-
1
0.194
12.040
2.78
DA-31a
Post
R -Development 2-
2
0.293
12.040
4.37
DA-31a
Post
R -Development 5-
5
0.470
12.040
7.18
DA-31a
Post -Development 10
10
0.635
12.020
9.75
DA-31a
Post -Development 25
25
0.891
12.020
13.73
DA-31a
Post -Development 50
50
1.123
12.020
17.28
DA-31a
Post -Development
100
1.385
12.010
21.24
100-YR
DA-32a
Post
R -Development 1-
1
0.152
12.000
2.51
DA-32a
Post
R -Development 2-
2
0.220
11.980
3.71
DA-32a
Post
R -Development 5-
5
0.340
11.970
5.79
DA-32a
Post -Development 10
10
0.449
11.970
7.66
DA-32a
Post -Development 25
25
0.616
11.960
10.48
DA-32a
Post -Development 50
50
0.766
11.960
12.97
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Subsection: Master Network Summary
Catchments Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Event
Volume
(hours)
(ft3/s)
(years)
(ac-ft)
DA-32a
Post -Development
100
0.934
11.960
15.73
100-YR
DA-31b
Post
R -Development 1-
1
0.373
11.920
7.05
DA-31b
Post
R -Development 2-
2
0.500
11.920
9.43
DA-31b
Post
R -Development 5-
5
0.711
11.920
13.30
DA-31b
Post -Development 10
10
0.895
11.920
16.61
DA-31b
Post -Development 25
25
1.170
11.920
21.44
DA-31b
Post -Development 50
50
1.411
11.920
25.59
DA-31b
Post -Development
100
1.677
11.920
30.11
100-YR
DA-32b
Post
R -Development 1-
1
0.358
11.920
6.77
DA-32b
Post
R -Development 2-
2
0.477
11.920
8.97
DA-32b
Post
R -Development 5-
5
0.673
11.920
12.53
DA-32b
Post -Development 10
10
0.844
11.920
15.57
DA-32b
Post -Development 25
25
1.098
11.920
20.00
DA-32b
Post -Development 50
50
1.320
11.920
23.80
DA-32b
Post -Development
100
1.565
11.920
27.94
100-YR
DA-35
Post
R -Development 1-
1
0.210
11.920
3.96
DA-35
Post
R -Development 2-
2
0.276
11.920
5.16
DA-15
Post
R -Development 5-
5
0.384
11.920
7.08
DA-15
Post -Development 10
10
0.478
11.920
8.72
DA-15
Post -Development 25
25
0.616
11.920
11.08
DA-35
Post -Development 50
50
0.736
11.920
13.11
DA-35
Post -Development
100
0.869
11.920
15.32
100-YR
DA-33
Post
R -Development 1-
1
0.108
11.920
2.04
DA-33
Post
R -Development 2-
2
0.144
11.920
2.70
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Subsection: Master Network Summary
Catchments Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Event
Volume
(hours)
(ft3/s)
(years)
(ac-ft)
DA-33
Post
R -Development 5-
5
0.203
11.920
3.77
DA-33
Post -Development 10
10
0.254
11.920
4.69
DA-33
Post -Development 25
25
0.331
11.920
6.02
DA-33
Post -Development 50
50
0.397
11.920
7.17
DA-33
Post -Development
100
0.471
11.920
8.41
100-YR
DA-H1
Post
R -Development 1-
1
0.169
11.920
3.20
DA-H1
Post
R -Development 2-
2
0.227
11.920
4.28
DA-H1
Post
R -Development 5-
5
0.323
11.920
6.04
DA-H1
Ps -Development 10
10
0.406
11.920
7.54
DA-H 1
Post -Development 25
25
0.531
11.920
9.73
DA-H 1
Post -Development 50
50
0.641
11.920
11.62
DA-H1
Post -Development
100
0.761
11.920
13.67
100-YR
DA-Il
Post
R -Development 1-
1
9.628
12.080
126.68
DA-Il
Post
R -Development 2-
2
13.514
12.080
180.05
DA-Il
Post
R -Development 5-
5
20.153
12.080
269.68
DA-Il
Post -Development 10
10
26.102
12.070
348.84
DA-Il
Post -Development 25
25
35.108
12.070
466.72
DA-Il
Post -Development 50
50
43.094
12.070
569.43
DA-Il
Post -Development
100
51.980
12.070
682.09
100-YR
DA-II-PRE
Post
R -Development 1-
1
7.779
12.080
99.08
DA-II-PRE
Post
R -Development 2-
2
11.297
12.080
148.10
DA-II-PRE
Post
R -Development 5-
5
17.446
12.080
232.59
DA-II-PRE
Post -Development 10
10
23.053
12.080
308.45
R
DA-Il-PRE
Post -Development 25
25
31.652
12.070
423.16
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Subsection: Master Network Summary
Catchments Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Event
Volume
(hours)
(ft3/s)
(years)
(ac-ft)
DA-IS-PRE
Post -Development 50
50
39.353
12.070
524.46
DA-Il-PRE
Post -Development
100
47.981
12.070
636.36
100-YR
J6
Post
R -Development 1-
1
0.045
11.930
0.84
J6
Post
R -Development 2-
2
0.062
11.920
1.18
J6
Post
R -Development 5-
5
0.092
11.920
1.74
J6
Post -Development 10
10
0.119
11.920
2.24
J6
Post -Development 25
25
0.159
11.920
2.97
J6
Post -Development 50
50
0.194
11.920
3.60
J6
Post -Development
100
0.234
11.920
4.30
100-YR
J7
Post
R -Development 1-
1
0.072
11.930
1.36
J7
Post
R -Development 2-
2
0.100
11.920
1.88
J7
Post
R -Development 5-
5
0.146
11.920
2.76
J7
Post -Development 10
10
0.188
11.920
3.52
J7
Post -Development 25
25
0.250
11.920
4.65
J7
Post -Development 50
50
0.305
11.920
5.63
J7
Post -Development
100
0.366
11.920
6.69
100-YR
Node Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event Volume (hours) (ft3/s)
(years) (ac-ft)
0-133
Post
R -Development 1-
1
0.091
12.380
0.29
0-133
Post
R -Development 2-
2
0.134
12.060
1.75
0-133
Post
R -Development 5-
5
0.205
12.000
3.76
0-G3
Post -Development 10
10
0.267
11.960
5.14
0-133
Post -Development 25
25
0.359
11.950
6.83
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Subsection: Master Network Summary
Node Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Event
Volume
(hours)
(ft3/S)
(years)
(ac-ft)
0-G3
Post -Development 50
50
0.440
11.950
8.21
0-G3
Post -Development
100
0.529
11.950
9.68
100-YR
0-132
Post
R -Development 1-
1
0.032
12.060
0.50
0-132
Post
R -Development 2-
2
0.050
12.020
1.04
0-132
Post
R -Development 5-
5
0.080
11.960
1.74
0-G2
Post -Development 10
10
0.107
11.950
2.22
0-G2
Post -Development 25
25
0.147
11.940
2.91
0-G2
Post -Development 50
50
0.181
11.940
3.51
0-G2
Post -Development
100
0.220
11.940
4.15
100-YR
0-G1
Post
R -Development 1-
1
0.234
12.040
3.55
0-GI
Post
R -Development 2-
2
0.326
12.010
5.92
0-GI
Post
R -Development 5-
5
0.476
11.970
9.02
0-GI
Post -Development 10
10
0.606
11.960
11.34
0-GI
Post -Development 25
25
0.798
11.960
14.58
0-GI
Post -Development 50
50
0.966
11.950
17.37
0-GI
Post -Development
100
1.156
11.950
20.39
100-YR
042-I3
Post
R -Development 1-
1
0.362
12.150
3.74
042-I3
Post
R -Development 2-
2
0.537
12.090
8.09
042-I3
Post
R -Development 5-
5
0.843
12.050
14.62
042-I3
Post -Development 10
10
1.121
12.030
19.48
042-I3
Post -Development 25
25
1.540
12.030
25.97
042-I3
Post -Development 50
50
1.910
12.030
30.88
042-I3
Post -Development
100
2.321
12.040
36.23
100-YR
044
Post
R -Development 1-
1
0.053
12.150
0.33
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Subsection: Master Network Summary
Node Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Event
Volume
(hours)
(ft3/S)
(years)
(ac-ft)
O44
Post
R -Development 2-
2
0.089
12.050
1.53
O44
Post
R -Development 5-
5
0.149
12.000
2.98
O44
Post -Development 10
10
0.203
11.970
4.05
O44
Post -Development 25
25
0.284
11.960
5.49
O44
Post -Development 50
50
0.356
11.950
6.70
O44
Post -Development
100
0.435
11.950
8.05
100-YR
0-31
Post
R -Development 1-
1
0.562
12.060
6.12
0-31
Post
R -Development 2-
2
0.786
12.050
9.34
0-31
Post
R -Development 5-
5
1.171
12.050
15.10
0-31
Post -Development 10
10
1.519
12.040
20.31
0-31
Post -Development 25
25
2.047
12.030
28.12
0-31
Post -Development 50
50
2.517
12.030
35.04
0-31
Post -Development
100
3.043
12.030
42.65
100-YR
0 32
Post
R -Development 1-
1
0.504
12.050
6.25
0 32
Post
R -Development 2-
2
0.690
12.040
9.46
0 32
Post
R -Development 5-
5
1.004
12.020
14.82
0 32
Post -Development 10
10
1.282
12.020
19.40
0 32
Post -Development 25
25
1.700
12.000
26.12
0 32
Post -Development 50
50
2.070
11.990
32.01
0-32
Post -Development
100
2.480
11.980
38.49
100-YR
0-35
Post
R -Development 1-
1
0.172
12.010
3.17
0-35
Post
R -Development 2-
2
0.236
11.960
4.68
0-35
Post
R -Development 5-
5
0.342
11.950
6.67
0-35
Post -Development 10
10
0.435
11.940
8.26
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Subsection: Master Network Summary
Node Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Event
Volume
(hours)
(ft3/S)
(years)
(ac-ft)
0-35
Post -Development 25
25
0.571
11.940
10.63
0-35
Post -Development 50
50
0.688
11.940
12.73
0-35
Post -Development
100
0.818
11.930
14.96
100-YR
0-33
Post
R -Development 1-
1
0.075
12.490
0.19
0-33
Post
R -Development 2-
2
0.110
12.060
1.41
0-33
Post
R -Development 5-
5
0.168
12.000
3.08
0-33
Post -Development 10
10
0.218
11.960
4.22
0-33
Post -Development 25
25
0.293
11.950
5.60
0-33
Post -Development 50
50
0.359
11.950
6.71
0-33
Post -Development
100
0.432
11.950
7.91
100-YR
0-H1
Post
R -Development 1-
1
0.133
12.050
1.91
0-H1
Post
R -Development 2-
2
0.189
12.010
3.48
0-H1
Post
R -Development 5-
5
0.283
11.960
5.53
0-H1
Ps -Development 10
10
0.365
11.950
7.02
0-H1
Post -Development 25
25
0.488
11.950
9.15
0-H1
Post -Development 50
50
0.595
11.950
10.97
0-H1
Post -Development
100
0.713
11.940
12.95
100-YR
NODE -A
Post
R -Development 1-
1
8.468
12.450
36.32
NODE -A
Post
R -Development 2-
2
12.164
12.310
82.74
NODE -A
Post
R -Development 5-
5
18.507
12.220
179.17
NODE -A
Post -Development 10
10
24.203
12.170
279.93
NODE -A
Post -Development 25
25
32.778
12.160
398.53
NODE -A
Post -Development 50
50
40.433
12.150
499.59
NODE -A
Post -Development
100
49.105
12.140
609.43
100-YR
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Subsection: Master Network Summary
Node Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Event
Volume
(hours)
(ft3/S)
(years)
(ac-ft)
NODE -A -PRE
Post
R -Development 1-
1
7.779
12.080
99.08
NODE -A -PRE
Post
R -Development 2-
2
11.297
12.080
148.10
NODE -A -PRE
Post
R -Development 5-
5
17.446
12.080
232.59
NODE -A -PRE
Post -Development 10
10
23.053
12.080
308.45
NODE -A -PRE
Post -Development 25
25
31.652
12.070
423.16
NODE -A -PRE
Post -Development 50
50
39.353
12.070
524.46
NODE -A -PRE
Post -Development
100
47.981
12.070
636.36
100-YR
0-36
Post
R -Development 1-
1
0.045
11.930
0.84
0-36
Post
R -Development 2-
2
0.062
11.920
1.18
0-36
Post
R -Development 5-
5
0.092
11.920
1.74
0-36
Post -Development 10
10
0.119
11.920
2.24
0-36
Post -Development 25
25
0.159
11.920
2.97
0-36
Post -Development 50
50
0.194
11.920
3.60
0-36
Post -Development
100
0.234
11.920
4.30
100-YR
0-37
Post
R -Development 1-
1
0.072
11.930
1.36
0 37
Post
R -Development 2-
2
0.100
11.920
1.88
0 37
Post
R -Development 5-
5
0.146
11.920
2.76
0 37
Post -Development 10
10
0.188
11.920
3.52
0 37
Post -Development 25
25
0.250
11.920
4.65
0-37
Post -Development 50
50
0.305
11.920
5.63
0-37
Post -Development
100
0.366
11.920
6.69
100-YR
Pond Summary
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Subsection: Master Network Summary
Pond Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event volume (hours) (fta/S)
(years) (ac-ft)
Maximum
Maximum
Water
Pond Storage
Surface
(ac-ft)
Elevation
(ft)
Post-
BMP-G3 (IN)
Development
1
0.133
11.920
2.51
(N/A)
(N/A)
1-YR
BMP G3
Post
(DUFF)
Development
1
0.091
12.380
0.29
359.01
0.070
1-YR
Post-
BMP-G3 (IN)
Development
2
0.177
11.920
3.33
(N/A)
(N/A)
2-YR
BMP G3
Post
(DUFF)
Development
2
0.134
12.060
1.75
359.14
0.080
2-YR
Post-
BMP-G3 (IN)
Development
5
0.250
11.920
4.65
(N/A)
(N/A)
5-YR
BMP G3
Post
(DUFF)
Development
5
0.205
12.000
3.76
359.25
0.088
5-YR
Poi
BMP-G3 (IN)
Development
10
0.313
11.920
5.78
(N/A)
(N/A)
10-YR
BMP G3
Post
(DUFF)
Development
10
0.267
11.960
5.14
359.31
0.094
10-YR
Poi
BMP-G3 (IN)
Development
25
0.407
11.920
7.42
(N/A)
(N/A)
25-YR
BMP G3
Post
(DUFF)
Development
25
0.359
11.950
6.83
359.38
0.099
25-YR
Poi
BMP-G3 (IN)
Development
50
0.490
11.920
8.83
(N/A)
(N/A)
50-YR
BMP G3
Post
(DUFF)
Development
50
0.440
11.950
8.21
359.43
0.103
50-YR
Poi
BMP-G3 (IN)
Development
100
0.581
11.920
10.37
(N/A)
(N/A)
100-YR
BMP G3
Post
(DUFF)
Development
100
0.529
11.950
9.68
359.48
0.108
100-YR
Poi
BMP-G2 (IN)
Development
1
0.052
11.920
0.98
(N/A)
(N/A)
1-YR
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Page 10 of 20
Subsection:
Master Network
Summary
Pond Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Maximum
Maximum
Event
Volume
(hours)
(ft3/S)
Water
Pond Storage
(years)
(ac-ft)
Surface
(ac-ft)
Elevation
(ft)
BMP-G2
Post
(DUFF)
Development
1
0.032
12.060
0.50
356.56
0.022
1-YR
Poi
BMP-G2 (IN)
Development
2
0.070
11.920
1.32
(N/A)
(N/A)
2-YR
BMP-G2
Post
(DUFF)
Development
2
0.050
12.020
1.04
356.61
0.024
2-YR
Poi
BMP-G2 (IN)
Development
5
0.100
11.920
1.88
(N/A)
(N/A)
5-YR
BMP-G2
Post
(DUFF)
Development
5
0.080
11.960
1.74
356.65
0.026
5-YR
Poi
BMP-G2 (IN)
Development
10
0.127
11.920
2.36
(N/A)
(N/A)
10-YR
BMP-G2
Post
(DUFF)
Development
10
0.107
11.950
2.22
356.68
0.028
10-YR
Poi
BMP-G2 (IN)
Development
25
0.166
11.920
3.06
(N/A)
(N/A)
25-YR
BMP-G2
Post
(DUFF)
Development
25
0.147
11.940
2.91
356.72
0.029
25-YR
Poi
BMP-G2 (IN)
Development
50
0.201
11.920
3.67
(N/A)
(N/A)
50-YR
BMP-G2
Post
(DUFF)
Development
50
0.181
11.940
3.51
356.75
0.031
50-YR
Poi
BMP-G2 (IN)
Development
100
0.240
11.920
4.33
(N/A)
(N/A)
100-YR
BMP-G2
Post
(DUFF)
Development
100
0.220
11.940
4.15
356.78
0.032
100-YR
Poi
BMP-Gl (IN)
Development
1
0.304
11.920
5.73
(N/A)
(N/A)
1-YR
1
BMPF)
Poi
(DM
Development
1
0.234
12.040
3.55
353.24
0.127
1-YR
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Subsection:
Master Network
Summary
Pond Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Maximum
Maximum
Event
Volume
(hours)
(ft3/S)
Water
Pond Storage
(years)
(ac-ft)
Surface
(ac-ft)
Elevation
(fit)
Poi
BMP-Gl (IN)
Development
2
0.400
11.920
7.47
(N/A)
(N/A)
2-YR
BMP-G1
Post
(OUF)
Development
2
0.326
12.010
5.92
353.34
0.139
2-YR
Poi
BMP-GI (IN)
Development
5
0.555
11.920
10.24
(N/A)
(N/A)
5-YR
BMP-G1
Post
(OUF)
Development
5
0.476
11.970
9.02
353.46
0.153
5-YR
Poi
BMP-GI (IN)
Development
10
0.691
11.920
12.60
(N/A)
(N/A)
10-YR
BMP-G1
Post
(OUF)
Development
10
0.606
11.960
11.34
353.53
0.162
10-YR
Poi
BMP-Gl (IN)
Development
25
0.891
11.920
16.03
(N/A)
(N/A)
25-YR
BMP-G1
Post
(OUF)
Development
25
0.798
11.960
14.58
353.63
0.174
25-YR
Poi
BMP-GI (IN)
Development
50
1.065
11.920
18.96
(N/A)
(N/A)
50-YR
BMP-G1
Post
(OUF)
Development
50
0.966
11.950
17.37
353.71
0.184
50-YR
Poi
BMP-GI (IN)
Development
100
1.257
11.920
22.16
(N/A)
(N/A)
100-YR
BMP-G1
Post
(OUF)
Development
100
1.156
11.950
20.39
353.80
0.194
100-YR
BMP-I2-I3
Post
(IN)
Development
1
0.487
12.010
7.97
(N/A)
(N/A)
1-YR
BMP-I2-I3
Post
(OUF)
Development
1
0.362
12.150
3.74
353.05
0.185
1-YR
BMP-I2-I3
Poi
(IN)
Development
2
0.673
11.990
11.04
(N/A)
(N/A)
2-YR
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Subsection:
Master Network
Summary
Pond Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Maximum
Maximum
Event
Volume
(hours)
(ft3/S)
Water
Pond Storage
(years)
(ac-ft)
Surface
(ac-ft)
Elevation
(ft)
BMP-I2-I3
Post
(OUF)
Development
2
0.537
12.090
8.09
353.22
0.216
2-YR
BMP-I2-I3
Post
(IN)
Development
5
0.987
11.990
16.15
(N/A)
(N/A)
5-YR
BMP-I2-I3
Post
(OM
Development
5
0.843
12.050
14.62
353.40
0.248
5-YR
BMP-I2-I3
Post
(IN)
Development
10
1.267
11.990
20.60
(N/A)
(N/A)
10-YR
BMP-I2-I3
Post
(OM
Development
10
1.121
12.030
19.48
353.50
0.264
10-YR
BMP-I2-I3
Post
(IN)
Development
25
1.687
11.990
27.16
(N/A)
(N/A)
25-YR
BMP-I2-I3
Post
(OM
Development
25
1.540
12.030
25.97
353.61
0.285
25-YR
BMP-I2-I3
Post
(IN)
Development
50
2.058
11.990
32.84
(N/A)
(N/A)
50-YR
BMP-I2-I3
Post
(OM
Development
50
1.910
12.030
30.88
353.73
0.308
50-YR
BMP-I2-I3
Post
(IN)
Development
100
2.470
11.980
39.07
(N/A)
(N/A)
100-YR
BMP-I2-I3
Post
(OM
Development
100
2.321
12.040
36.23
353.89
0.337
100-YR
Poi
BMP-I4 (IN)
Development
1
0.090
11.930
1.70
(N/A)
(N/A)
1-YR
BMP-I4
Post
(OM
Development
1
0.053
12.150
0.33
355.07
0.040
1-YR
Poi
BMP-I4 (IN)
Development
2
0.126
11.920
2.38
(N/A)
(N/A)
2-YR
BMP-I4
Poi
(D�
Development
2
0.089
12.050
1.53
355.22
0.047
2-YR
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Subsection:
Master Network
Summary
Pond Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Maximum
Maximum
Event
Volume
(hours)
(ft3/S)
Water
Pond Storage
(years)
(ac-ft)
Surface
(ac-ft)
Elevation
(ft)
Poi
BMP-I4 (IN)
Development
5
0.186
11.920
3.52
(N/A)
(N/A)
5-YR
BMP-I4
Post
(OUF)
Development
5
0.149
12.000
2.98
355.34
0.053
5-YR
Poi
BMP-I4 (IN)
Development
10
0.240
11.920
4.52
(N/A)
(N/A)
10-YR
BMP-I4
Post
(Dui
Development
10
0.203
11.970
4.05
355.42
0.057
10-YR
Poi
BMP-I4 (IN)
Development
25
0.321
11.920
6.00
(N/A)
(N/A)
25-YR
BMP-I4
Post
(OM
Development
25
0.284
11.960
5.49
355.51
0.062
25-YR
Poi
BMP-I4 (IN)
Development
50
0.393
11.920
7.29
(N/A)
(N/A)
50-YR
BMP-I4
Post
(OM
Development
50
0.356
11.950
6.70
355.58
0.066
50-YR
Poi
BMP-I4 (IN)
Development
100
0.473
11.920
8.70
(N/A)
(N/A)
100-YR
BMP-I4
Post
(OM
Development
100
0.435
11.950
8.05
355.66
0.071
100-YR
Poi
BMP-31 (IN)
Development
1
0.567
11.940
8.81
(N/A)
(N/A)
1-YR
BMP-31
Post
(OM
Development
1
0.562
12.060
6.12
333.98
0.224
1-YR
Poi
BMP-31 (IN)
Development
2
0.793
11.940
12.43
(N/A)
(N/A)
2-YR
BMP-31
Post
(OM
Development
2
0.786
12.050
9.34
334.11
0.260
2-YR
Poi
BMP-31 (IN)
Development
5
1.181
11.940
18.54
(N/A)
(N/A)
5-YR
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Subsection:
Master Network
Summary
Pond Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Maximum
Maximum
Event
Volume
(hours)
(ft3/S)
Water
Pond Storage
(years)
(ac-ft)
Surface
(ac-ft)
Elevation
(fit)
BMP-31
Post
(OUF)
Development
5
1.171
12.050
15.10
334.28
0.312
5-YR
Poi
BMP-31 (IN)
Development
10
1.530
11.940
23.94
(N/A)
(N/A)
10-YR
BMP-31
Post
(OUF)
Development
10
1.519
12.040
20.31
334.41
0.351
10-YR
Poi
BMP-31 (IN)
Development
25
2.062
11.930
32.04
(N/A)
(N/A)
25-YR
BMP-31
Post
(OUF)
Development
25
2.047
12.030
28.12
334.58
0.403
25-YR
Poi
BMP-31 (IN)
Development
50
2.535
11.930
39.14
(N/A)
(N/A)
50-YR
BMP-31
Post
(OUF)
Development
50
2.517
12.030
35.04
334.72
0.445
50-YR
Poi
BMP-31 (IN)
Development
100
3.062
11.930
46.97
(N/A)
(N/A)
100-YR
BMP-31
Post
(OUF)
Development
100
3.043
12.030
42.65
334.85
0.486
100-YR
Poi
BMP-32 (IN)
Development
1
0.510
11.930
8.97
(N/A)
(N/A)
1-YR
BMP-J2
Post
(OUF)
Development
1
0.504
12.050
6.25
330.99
0.262
1-YR
Poi
BMP-32 (IN)
Development
2
0.697
11.930
12.32
(N/A)
(N/A)
2-YR
BMP-J2
Post
(OUF)
Development
2
0.690
12.040
9.46
331.11
0.290
2-YR
Poi
BMP-32 (IN)
Development
5
1.012
11.930
17.85
(N/A)
(N/A)
5-YR
BMP-J2
elopment
(off
De
5
1.004
12.020
14.82
331.25
0.326
5-YR
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Subsection:
Master Network
Summary
Pond Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Maximum
Maximum
Event
Volume
(hours)
(ft3/S)
Water
Pond Storage
(years)
(ac-ft)
Surface
(ac-ft)
Elevation
(ft)
Poi
BMP-32 (IN)
Development
10
1.293
11.930
22.67
(N/A)
(N/A)
10-YR
BMP-J2
Post
(DUFF)
Development
10
1.282
12.020
19.40
331.35
0.352
10-YR
Poi
BMP-32 (IN)
Development
25
1.714
11.930
29.79
(N/A)
(N/A)
25-YR
BMP-J2
Post
(DUFF)
Development
25
1.700
12.000
26.12
331.49
0.387
25-YR
Poi
BMP-32 (IN)
Development
50
2.086
11.930
35.98
(N/A)
(N/A)
50-YR
BMP-J2
Post
(DUFF)
Development
50
2.070
11.990
32.01
331.59
0.414
50-YR
Poi
BMP-32 (IN)
Development
100
2.499
11.930
42.75
(N/A)
(N/A)
100-YR
BMP-J2
Post
(DUFF)
Development
100
2.480
11.980
38.49
331.69
0.442
100-YR
Poi
BMP-35 (IN)
Development
1
0.210
11.920
3.96
(N/A)
(N/A)
1-YR
BMP-35
Post
(DUFF)
Development
1
0.172
12.010
3.17
352.22
0.074
1-YR
Poi
BMP-35 (IN)
Development
2
0.276
11.920
5.16
(N/A)
(N/A)
2-YR
BMP-35
Post
(DUFF)
Development
2
0.236
11.960
4.68
352.29
0.078
2-YR
Poi
BMP-35 (IN)
Development
5
0.384
11.920
7.08
(N/A)
(N/A)
5-YR
BMP-35
Post
(DUFF)
Development
5
0.342
11.950
6.67
352.37
0.084
5-YR
Poi
BMP-35 (IN)
Development
10
0.478
11.920
8.72
(N/A)
(N/A)
10-YR
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Subsection:
Master Network
Summary
Pond Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Maximum
Maximum
Event
Volume
(hours)
(ft3/S)
Water
Pond Storage
(years)
(ac-ft)
Surface
(ac-ft)
Elevation
(ft)
BMP-35
Post
(DUFF)
Development
10
0.435
11.940
8.26
352.43
0.088
10-YR
Poi
BMP-35 (IN)
Development
25
0.616
11.920
11.08
(N/A)
(N/A)
25-YR
BMP-35
Post
(DUFF)
Development
25
0.571
11.940
10.63
352.51
0.093
25-YR
Poi
BMP-35 (IN)
Development
50
0.736
11.920
13.11
(N/A)
(N/A)
50-YR
BMP-35
Post
(DUFF)
Development
50
0.688
11.940
12.73
352.56
0.097
50-YR
Poi
BMP-35 (IN)
Development
100
0.869
11.920
15.32
(N/A)
(N/A)
100-YR
BMP-35
Post
(DUFF)
Development
100
0.818
11.930
14.96
352.61
0.100
100-YR
Poi
BMP-33 (IN)
Development
1
0.108
11.920
2.04
(N/A)
(N/A)
1-YR
BMP-J3
Post
(DUFF)
Development
1
0.075
12.490
0.19
352.99
0.056
1-YR
Poi
BMP-33 (IN)
Development
2
0.144
11.920
2.70
(N/A)
(N/A)
2-YR
BMP-J3
Post
(DUFF)
Development
2
0.110
12.060
1.41
353.12
0.065
2-YR
Poi
BMP-33 (IN)
Development
5
0.203
11.920
3.77
(N/A)
(N/A)
5-YR
BMP-J3
Post
(DUFF)
Development
5
0.168
12.000
3.08
353.21
0.071
5-YR
Poi
BMP-33 (IN)
Development
10
0.254
11.920
4.69
(N/A)
(N/A)
10-YR
BMP-J3
Poi
(DUFF)
Development
10
0.218
11.960
4.22
353.27
0.075
10-YR
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Subsection:
Master Network
Summary
Pond Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Maximum
Maximum
Event
Volume
(hours)
(ft3/S)
Water
Pond Storage
(years)
(ac-ft)
Surface
(ac-ft)
Elevation
(fit)
Poi
BMP-33 (IN)
Development
25
0.331
11.920
6.02
(N/A)
(N/A)
25-YR
BMP-J3
Post
(OM
Development
25
0.293
11.950
5.60
353.33
0.079
25-YR
Poi
BMP-33 (IN)
Development
50
0.397
11.920
7.17
(N/A)
(N/A)
50-YR
BMP-J3
Post
(OM
Development
50
0.359
11.950
6.71
353.37
0.083
50-YR
Poi
BMP-33 (IN)
Development
100
0.471
11.920
8.41
(N/A)
(N/A)
100-YR
BMP-J3
Post
(OM
Development
100
0.432
11.950
7.91
353.42
0.086
100-YR
Poi
BMP-Hl (IN)
Development
1
0.169
11.920
3.20
(N/A)
(N/A)
1-YR
BMP-Hl
Post
(OM
Development
1
0.133
12.050
1.91
357.15
0.069
1-YR
Poi
BMP-Hl (IN)
Development
2
0.227
11.920
4.28
(N/A)
(N/A)
2-YR
BMP-Hl
Post
(OM
Development
2
0.189
12.010
3.48
357.23
0.075
2-YR
Poi
BMP-Hl (IN)
Development
5
0.323
11.920
6.04
(N/A)
(N/A)
5-YR
BMP-Hl
Post
(OM
Development
5
0.283
11.960
5.53
357.32
0.082
5-YR
Poi
BMP-Hl (IN)
Development
10
0.406
11.920
7.54
(N/A)
(N/A)
10-YR
BMP-Hl
Post
(OM
Development
10
0.365
11.950
7.02
357.38
0.086
10-YR
Poi
BMP-Hl (IN)
Development
25
0.531
11.920
9.73
(N/A)
(N/A)
25-YR
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Subsection:
Master Network
Summary
Pond Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Maximum
Maximum
Event
Volume
(hours)
(ft3/S)
Water
Pond Storage
(years)
(ac-ft)
Surface
(ac-ft)
Elevation
(fit)
BMP-Hl
Post
(OM
Development
25
0.488
11.950
9.15
357.46
0.092
25-YR
Poi
BMP-Hl (IN)
Development
50
0.641
11.920
11.62
(N/A)
(N/A)
50-YR
BMP-Hl
Post
(OM
Development
50
0.595
11.950
10.97
357.52
0.097
50-YR
Poi
BMP-Hl (IN)
Development
100
0.761
11.920
13.67
(N/A)
(N/A)
100-YR
BMP-Hl
Post
(OM
Development
100
0.713
11.940
12.95
357.58
0.102
100-YR
Poi
BMP-Il (IN)
Development
1
9.628
12.080
126.68
(N/A)
(N/A)
1-YR
BMP-Il
Post
(Our)
OM
Development
1
8.468
12.450
36.32
342.52
7.938
1-YR
Poi
BMP-Il (IN)
Development
2
13.514
12.080
180.05
(N/A)
(N/A)
2-YR
BMP-Il
Post
(OM
Development
2
12.164
12.310
82.74
343.04
8.898
2-YR
Poi
BMP-Il (IN)
Development
5
20.153
12.080
269.68
(N/A)
(N/A)
5-YR
BMP-Il
Post
(OM
Development
5
18.507
12.220
179.17
343.74
10.249
5-YR
Poi
BMP-Il (IN)
Development
10
26.102
12.070
348.84
(N/A)
(N/A)
10-YR
BMP-Il
Post
(OM
Development
10
24.203
12.170
279.93
344.11
10.992
10-YR
Poi
BMP-Il (IN)
Development
25
35.108
12.070
466.72
(N/A)
(N/A)
25-YR
BMP-Il
Poi
(OM
Development
Development
25
32.778
12.160
398.53
344.57
11.956
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Subsection:
Master Network Summary
Pond Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Maximum
Maximum
Event
Volume
(hours)
(ft3/S)
Water
Pond Storage
(years)
(ac-ft)
Surface
(ac-ft)
Elevation
(ft)
Poi
BMP-Il (IN)
Development
50
43.094
12.070
569.43
(N/A)
(N/A)
50-YR
BMP-Il
Post
(DM
Development
50
40.433
12.150
499.59
344.91
12.712
50-YR
Poi
BMP-Il (IN)
Development
100
51.980
12.070
682.09
(N/A)
(N/A)
100-YR
BMP-IS
Poi
(D�
Development
100
49.105
12.140
609.43
345.24
13.460
100-YR
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Appendix B — BMP Stage Storage
BMP G1- BIORETENTION L2
Elevation (ft)
Area (SF)
Area
(AC)
Al+A2+(Al*A2)1/2
Volume (CF)
Cumulative
Volume (CF)
Cumulative Volume
(AC-ft)
352
4,000.92
0.092
0.00
0.00
0.00
0.000
354
5,616.88
0.129
14,358.34
9,572.22
9,572.22
0.220
356
7,459.04
0.171
19,548.67
13,032.45
22,604.67
0.519
BMP G2 - BIORETENTION (L2)
Elevation (ft)
Area (SF)
Area
(AC)
Al+A2+(Al*A2)1/2
Volume (CF)
Cumulative
Volume (CF)
Cumulative Volume
(AC-ft)
357
1,588.70
0.036
0.00
0.00
0.00
0.000
358
2,918.50
0.067
6,660.48
2,220.16
2,220.16
0.051
BMP G3 - BIORETENTION (L2)
Elevation (ft)
Area (SF)
Area
(AC)
Al+A2+(Al*A2)1/2
Volume (CF)
Cumulative
Volume (CF)
Cumulative Volume
(AC-ft)
358
2,675.47
0.061
0.00
0.00
0.00
0.000
360
4,155.21
0.095
10,164.92
6,776.61
6,776.61
0.156
362
5,861.36
0.135
14,951.67
9,967.78
16,744.39
0.384
BMP I2 - BIORETENTION (L2)
Elevation (ft)
Area (SF)
Area
(AC)
Al+A2+(Al*A2)1/2
Volume (CF)
Cumulative
Volume (CF)
Cumulative Volume
(AC-ft)
35L8
3,574.70
0.082
0.00
0.00
0.00
0.000
352
3,728.20
0.086
10,953.54
730.24
730.24
0.017
353
4,557.50
0.105
12,407.75
4,135.92
4,866.15
0.112
BMPI3 - BIORETENTION (L2)
Elevation (ft)
Area (SF)
Area
(AC)
Al+A2+(Al*A2)1/2
Volume (CF)
Cumulative
Volume (CF)
Cumulative Volume
(AC-ft)
353
1,882.12
0.043
0.00
0.00
0.00
0.000
354
2,440.38
0.056
6,465.65
2,155+22
2,155.22
0.049
356
3,434.29
0.079
8,769.66
5,846.44
8,001.66
0.184
358
4,410.00
0.101
11,735.98
7,823.98
15,825.64
0.363
BMP74 - WET SWALE (L2)
Elevation (ft)
Area (SF)
Area
(AC)
Al+A2+(Al*A2)1/2
Volume (CF)
Cumulative
Volume (CF)
Cumulative Volume
(AC-ft)
354
1,269.48
0.029
0.00
0.00
0.00
0.000
355
1,981.47
0.045
4,836.96
1,612.32
1,612.32
0.037
356
2,824.63
0.065
7,171.88
2,390.63
4,002.95
0.092
BMP J1- WET SWALE (L2) REVISED 4112118
Elevation (ft)
Area (SF)
Area
(AC)
Al+A2+(Al*A2)1/2
Volume (CF)
Cumulative
Volume (CF)
Cumulative Volume
(AC-ft)
333
2,167.93
0.050
2,610.84
2,610.84
2,610.84
0.060
333.5
7,521.56
0.173
13,727.59
2,287.93
4,898.77
0.112
334
12,547.52
0.288
29,783.86
4,963.98
9,862.75
0.226
336
16,164.78
0.371
42,954.07
28,636.04
38,498.79
0.884
BMP J2 - WET SWALE (L2) REVISED 4112118
Elevation (ft)
Area (SF)
Area
AC
Al+A2+(Al*A2)1/2
Volume (CF)
Cumulative
Volume C
Cumulative Volume
AC-ft
326
25.71
0.001
0.00
0.00
0.00
0.000
329.5
1,250.96
0.029
1,456.01
1,698.68
1,698.68
0.039
330
4,705.31
0.108
8,382.41
1,397.07
3,095.74
0.071
330.5
9,225.56
0.212
20,519.43
3,419.90
6,515.65
0.150
332
12,755.88
0.293
32,829.49
16,414.74
22,930.39
0.526
BMP B - BIORETENTION LI
Elevation (ft)
Area (SF)
Area
(AC)
Al+A2+(Al*A2)1/2
Volume (CF)
Cumulative
Volume (CF)
Cumulative Volume
(AC-ft)
352
2,101.90
0.048
0.00
0.00
0.00
0.000
354
3,796.00
0.087
8,722.58
5,815.05
5,815.05
0.133
BMP JS - BIORETENTION (LI)
Elevation (ft)
Area (SF)
Area
(AC)
Al+A2+(Al*A2)1/2
Volume (CF)
Cumulative
Volume (CF)
Cumulative Volume
(AC-ft)
351
2,378.30
0.055
0.00
0.00
0.00
0.000
352
2,797.00
0.064
7,754.47
2,584.82
2,584.82
0.059
353
3,226.50
0.074
9,027.58
3,009.19
5,594.02
0.128
BMP HI - BIORETENTION (L2)
Elevation (ft)
Area (SF)
Area
(AC)
Al+A2+(Al*A2)1/2
Volume (CF)
Cumulative
Volume (CF)
Cumulative Volume
(AC-ft)
356
2,225.57
0.051
0.00
0.00
0.00
0.000
357
2,938.04
0.067
7,720.72
2,573.57
2,573.57
0.059
358
3,963.88
0.091
10,314.55
3,438.18
6,011.76
0.138
360
5,808.53
0.133
14,570.78
9,713.85
15,725.61
0.361
SWM BMP H (revised 1012512017)
Elevation (ft)
Area (SF)
Area
(AC)
Al+A2+(Al*A2)1/2
Volume (CF)
Cumulative
Volume (CF)
Cumulative Volume
(AC-ft)
334
17,247.30
0.396
0.00
0.00
0.00
0.000
336
25,660.50
0.589
63,945.25
42,630.17
42,630.17
0.979
338
32,984.00
0.757
87,737.21
58,491.48
101,121.64
2.321
338.5
35,489.00
0.815
102,686.58
17,114.43
118,236.07
2.714
340
47,007.90
1.079
123,341.28
61,670.64
179,906.71
4.130
340.5
56,795.20
1.304
155,473.43
25,912.24
205,818.95
4.725
341
1 61,840.80
1.420
177,900.33
29,650.05
235,469.01
5.406
342
77,065.50
1.769
207,941.02
69,313.67
304,782.68
6.997
344
87,578.20
2.011
246,797.57
164,531.71
469,314.39
10.774
346
109,874.10
2.522
295,547.03
197,031.35
666,345.74
15.297
SWM BMP H (Forebay #1)
Elevation (ft)
Area (SF)
Area
AC
Al+A2+(Al*A2)1/2
Volume (CF)
Cumulative
Volume C
Cumulative Volume
AC-ft
336
3,179.30
0.073
0.00
0.00
0.00
0.000
338
3,992.44
0.092
10,734.49
7,156.32
7,156.32
0.164
340
5,454.30
0.125
14,113.21
9,408.81
16,565.13
0.380
341
7,296.40
0.168
19,059.17
6,353.06
22,918.19
0.526
SWM BMP H (Forebay #2)
Elevation (ft)
Area (SF)
Area
(AC)
Al+A2+(Al*A2)1/2
Volume (CF)
Cumulative
Volume (CF)
Cumulative Volume
(AC-ft)
336
269.60
0.006
0.00
0.00
0.00
0.000
338
806.81
0.019
1,542.80
1,028.53
1,028.53
0.024
340
1,473.10
0.034
3,370.10
2,246.73
3,275.26
0.075
341
2,463.90
0.057
5,842.14
1,947.38
5,222.64
0.120
SWMBMPH (Foreb #3)
Elevation (ft)
Area (SF)
Area
(AC)
Al+A2+(Al*A2)1/2
Volume (CF)
Cumulative
Volume (CF)
Cumulative Volume
(AC-ft)
336
30.10
0.001
0.00
0.00
0.00
0.000
338
387.40
0.009
525.48
350.32
350.32
0.068
340
881.90
0.020
1,853.81
1,235.87
1,586.19
0.036
341
1,727.70
0.040
3,843.97
1,281.32
2,867.52
0.066
Appendix C — VRRM Spreadsheets
DEQ Virginia RunoffReducdon Method New Development Compliance Spmadsheet - Version 3.0
C 2021 BMP Standards and Specifications ID 2013 Draft BMP Standards and Specifications
Project Name: Rivanna Village(PHI and lbi (Eng. &Planning dated 1/25/2019 daM trout celb
Date: I 2-Mar-29 conznnt values
BMP Design Specifications List 2013 Draft 5tds & Spea calculation cells
Site Information
Post -Development Project (Treatment Volume and Loads)
Cover
Parc./.Pan swce lacteal - undisturbed.
PrnfeRed rorea/open spare or reforested land
22.34
2z3a
Marugetl Turl (acres) - tllrturbed, traded for
36.26
Yards or mberrurtmbemawM/man M
36.26
Imorma us Were (actual
32.01
32.01
I eoresyrpmnporeoreos musrcepmrenmmoumoome wren me nrgmra
xunop xmumon memoo
(Constants
Runoff Coefficients IRV)
Annual Randall (inches)
03
Target Rainfall Ewnt(incbes)
1.an
Total Phosphorus (TP)EMepni
a26
Total Ntrogm(M) EMC]mg/L)
1.86
Target TP Load pb/acri
0.41
Pi lumdess mrreedi on face
0.90
ASolls
lisais
csoils
DShcs
Ferri spare
0.02
0.03
0.04
0.05
Managua Tort
0.15
0.20
0.22
0.25
Impervinm coven
0.95
0e5
0e5
0.95
FmeVVOpen Space Cover(acres)
22.30
Treat
(aee-ft) a 3.2733
Treatment Volume (cubic feet) 162,5M
Tic Wad(lb/yr) 89.59
Tel Wad (ib r) 600.89
Informational Purposes Onl
Weighted RV(forert)
0.00
%Forest
25%
Managed Turf Cover(accei
36.26
Weighted Rv (turf)
0.22
%Managed Turf
CO%
ImperfimsC er(acree)
32.01
Rv(ImperWous)
0.95
%ImperWous
35%
Site Mea(anee)
90.61
Site RV
a."
DranaV Area
DnaiAte ux A EARNI tmv'AN.,
S. P..m..ni. vanme EEC
E. TURS AREA ED 111) Al. 1a1K DR.
TREATED n4 EA1a1A Da
roE ExxanESDxRDx,.DAA,x•,
BeMI
peMl
miu vxouxanus n[xunixc nrrzx nrvui xc RUNOFF xsooviox vxuT[55 i x o.a n B WED
. EREATENQWIEFFE M ......COM..EGINUTIONS
—Al" 3.BOB
xmaFOR
REMOVED
vmx Exxon Esmirnnx vExcncis IN Dn ABxAD Itest
ONE AND. gwxnmmwaxn TAB raa nnDA I
Dra nags Area B
wAAAI ex CARE'x[rtx eu
s. P..m..ni. P...me
rzx PQ
ax,Q wwa.Ca.
ro.B,xx.B.FREDUCTION ,xBB ,IW
IUU� TOTAL PHOSEHORUS AVAILABLE FOR REMOVAL IN <B BB/M
<ePB/REI
roar rxasrxovus Bemsix ms man ACCEDED xuxorr nrournax rnarncw ix oa a Byyx
... QUA"I OMC . TAB PoR.COM.E dlNL1TlON5
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s w Mwu mmnwx¢TABr Sne CuWMT l�A )
Drainage Area C
EACH IUAR
r. P..m..ni. Panme m RARE
TOTAL M PE VIOUC COVER FO an
,FO on 1 D 27 1 AREACHECR. OR
mTAE RUNOFF RmUrnON IN R k C FRI)l FEAR
TITAL FERMI AVAULABLE NOR REMOVAL IN CA. c BBryx
ioiu PxosVEN
nwnxs REMAINING AFTER APPINING RUNOFF REDUCTION Pc(I
RnrncEs IN OA. c BBnx
EEf WATER BWLIIYCBMPL1ANCf TAB PoRLif CBMMIANCf GINfATIOMF
METAL RUNOFF FOURTEEN INDOE Fin .—
xlmOOmREnmmwlm axxon--u--PRArncmlx B<C-1 ax
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Drainage Area B
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R.
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SWrmwMer Bert Management Practices (RR = Runoff ReduCion)
IF
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mru RUNOFF REDUCTION IN UA, D IF)
.....mi tsu
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Drainage Area C
wM..au..AMeer....l�al ChOd sire
OUR
S.
Stormwater Best Management Practices (RR = Runoff Reduction(
imal M DPph.... Pvailsele M, Removal In DA [IIB/
pen Melepment i,erzmam V 16me In O.A. [ (W)
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TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE DB/vI D
AC::rTOTAL PHOSEPHORUA REMOVEDWITHOUT RUNOFF REDUCTION Ad1H/vI
TOUH. PHOSPHORUS REMMED NOR RUNOFF
TOTOPHOSPHOSEUS LOAD==EEDAQIyv1
achy •1
TOTAL PxomHDRus REMmHIxO AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. c UWQ
SEEWATER gUALI"
nlHna
UDDEHREMDVLOwITHDIm ABIMnn
TOTALMORDDEH REMOV LO I H DA c nana
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n,m'al A—UPm.am Payell L t R.me..tl LO
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wMERMAD. A and Carr lavl DOWTO,N, ama is Pr,arthan sire area!
Evary yz"Lalaml10,73
w�mrtl�l
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Rams Pbmpbnm, A.anaMa Mr Ramnal M DA F INnI
Ran Daminpmma Rmaanma vnlnma In DA E IKI
aalaa.tmm ananka-un.-
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IMPERVIOUSTOTAL COVER
rzDlay� AREA
RarumaxUFORUEnC E D1.� EACHECK: OR.
UM. RFOOIRFD OM END OW D
AEOW .I
MOVED WITHOUT RUNOFF REDUCT a C.:.
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AEII rl
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SEEWATER gUALITY
AEIIy .l
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REMOVED IN DA F Ry D 25133
xmaan maanwa unnearm N. n
Rama-1
e—upmmm Man,weu m mame By xa IUVd
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urmaa, Area
o„aMIANEW aDAF.WAVE 'FACE,.
1 RK,
TOTAL M PE MOUC COVER rzo PQ
TOTAL TURF AREA rzo 11Q uderx. FEE
ro.a, RUNOFF REoUma.. DAC D JR
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„r
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EATREATED Ian AREA CHECK: OR.
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TOUTALLPHOESPHORIUSAIUALANNEIGR=OVA Al a AIIy .l
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MEAN. PHOSPHORUS RUN
CHSE�
NO
TOTAL PHOSPHORUS REMAINING AFTER APPLYING ANE LOAD REDUCTIONS IN D.A. A OWH
SEE WATER QUALITY
NOR EN RE�DWI� RUNOFF REDUCTO Al AAOW •1LET
xITROGEN REMOVED WITHOUTAAllb/nl MIT
TOTAL XXROGEX REMOVED 1N nA A O WY•1 1101
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1.1 Pxaspxn RVERAk fv 2emwf In xA 2 RAfNu 3A
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TOTALIMPERVIE-URCOREIRTHERENED(n)
AREA
2arumxU xER2UREA2EA2rtEA2Fpl.tl EAOIECR. W.
Umtvu RF.RWD ax sm UW,) 0
AeII nl
WORK. PHEREPHORM REMOVED WITHOUT RUNOFF REDUCT C.:.
AeII nl
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SEEWATER gUALI"
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n WFx RFmxwa WITHOUT
emuNIMO Ex REmWERIxpABaxn.l
Drainage Area C
P•FyN• A I•MCme, lavl
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AREA Melnpment TIMrzm•m Vtlum• In RA C ni I R.RTI
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Appendix D — Erosion and Sediment Control Data
Sed Basin Il
Sed Basin I2
Table of Contents
Outlet Input Data, 25 years
Outlet Input Data, 25 years
Subsection: Outlet Input Data
Label: Sed Basin I1
Requested Pond Water Surface Elevations
Minimum (Headwater) 336.00 ft
Increment (Headwater) 0.10 ft
Maximum (Headwater) 345.00 ft
Return Event: 25 years
Storm Event: 25-YR
Outlet Connectivity
Structure Type Outlet ID Direction Outfall El E2
(ft) (ft)
Stand Pipe
Riser - 1
Forward
Culvert - 1
341.00
345.00
Orifice -Circular
Orifice - 1
Forward
Culvert - 1
340.00
345.00
Culvert -Circular
Culvert - 1
Forward
TW
338.00
345.00
Rectangular Weir
Weir - 1
Forward
TW
342.00
345.00
Tailwater Settings
Tailwater
(N/A)
(N/A)
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Subsection: Outlet Input Data
Label: Sed Basin I1
Structure ID: Riser - 1
Structure Type: Stand Pipe
Number of Openings
1
Elevation
341.00 ft
Diameter
36.0 in
Orifice Area
7.1 ft2
Orifice Coefficient
0.600
Weir Length
9.42 ft
Weir Coefficient
3.00 (ft^0.5)/s
K Reverse
1.000
Manning's In
0.000
Kev, Charged Riser
0.000
Weir Submergence
False
Orifice H to crest
False
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Storm Event: 25-YR
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Subsection: Outlet Input Data
Label: Sed Basin I1
Structure ID: Culvert- 1
Structure Type: Culvert -Circular
Number of Barrels
1
Diameter
24.0 in
Length
50.00 ft
Length (Computed Barrel)
50.00 ft
Slope (Computed)
0.010 ft/ft
Outlet Control Data
Manning's In
0.013
Ke
0.900
Kb
0.012
Kr
0.000
Convergence Tolerance
0.00 ft
Inlet Control Data
Equation Form
Form 1
K
0.0340
M
1.5000
C
0.0553
Y
0.5400
TI ratio (HW/D)
1.258
T2 ratio (HW/D)
1.420
Slope Correction Factor
-0.500
Use unsubmerged inlet control 0 equation below T1
elevation.
Use submerged inlet control 0 equation above T2
elevation
In transition zone between unsubmerged and submerged
inlet control,
interpolate between flows at T1 & T2...
Return Event: 25 years
Storm Event: 25-YR
T1 Elevation 340.52 ft T1 Flow 15.55 ft3/s
T2 Elevation 340.84 ft T2 Flow 17.77 ft3/s
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Subsection: Outlet Input Data Return Event: 25 years
Label: Sed Basin I1 Storm Event: 25-YR
Structure ID: Orifice - 1
Structure Type: Orifice -Circular
Number of Openings
1
Elevation
340.00 ft
Orifice Diameter
6.0 in
Orifice Coefficient
0.600
Structure ID: Weir- 1
Structure Type: Rectangular Weir
Number of Openings
1
Elevation
342.00 ft
Weir Length
10.00 ft
Weir Coefficient
3.00 (ft^0.5)/s
Structure ID: TW
Structure Type: TW Setup, DS Channel
Tailwater Type
Free Outfall
Convergence Tolerances
Maximum Iterations
30
Tailwater Tolerance
0.01 ft
(Minimum)
Tailwater Tolerance
0.50 ft
(Maximum)
Headwater Tolerance
0.01 ft
(Minimum)
Headwater Tolerance
0.50ft
(Maximum)
Flow Tolerance (Minimum)
0.001 ft3/s
Flow Tolerance (Maximum)
10.000 ft3/s
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Subsection: Outlet Input Data
Label: Sed Basin I2
Requested Pond Water Surface Elevations
Minimum (Headwater) 346.50 ft
Increment (Headwater) 0.10 ft
Maximum (Headwater) 355.00 ft
Return Event: 25 years
Storm Event: 25-YR
Outlet Connectivity
Structure Type Outlet ID Direction Outfall El E2
(ft) (ft)
Stand Pipe
Riser - 1
Forward
Culvert - 1
352.80
355.00
Orifice -Circular
Orifice - 1
Forward
Culvert - 1
350.80
355.00
Culvert -Circular
Culvert - 1
Forward
TW
348.30
355.00
Rectangular Weir
Weir - 1
Forward
TW
353.00
355.00
Tailwater Settings
Tailwater
(N/A)
(N/A)
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Subsection: Outlet Input Data
Label: Sed Basin I2
Structure ID: Riser - 1
Structure Type: Stand Pipe
Number of Openings
1
Elevation
352.80 ft
Diameter
36.0 in
Orifice Area
7.1 ft2
Orifice Coefficient
0.600
Weir Length
9.42 ft
Weir Coefficient
3.00 (ft^0.5)/s
K Reverse
1.000
Manning's In
0.000
Kev, Charged Riser
0.000
Weir Submergence
False
Orifice H to crest
False
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Storm Event: 25-YR
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Subsection: Outlet Input Data
Label: Sed Basin I2
Structure ID: Culvert- 1
Structure Type: Culvert -Circular
Number of Barrels
1
Diameter
18.0 in
Length
32.00 ft
Length (Computed Barrel)
32.00 ft
Slope (Computed)
0.009 ft/ft
Outlet Control Data
Manning's In
0.013
Ke
0.500
Kb
0.018
Kr
0.000
Convergence Tolerance
0.00 ft
Inlet Control Data
Equation Form
Form 1
K
0.0098
M
2.0000
C
0.0398
Y
0.6700
TI ratio (HW/D)
1.156
T2 ratio (HW/D)
1.302
Slope Correction Factor
-0.500
Use unsubmerged inlet control 0 equation below T1
elevation.
Use submerged inlet control 0 equation above T2
elevation
In transition zone between unsubmerged and submerged
inlet control,
interpolate between flows at T1 & T2...
Return Event: 25 years
Storm Event: 25-YR
T1 Elevation 350.03 ft T1 Flow 7.58 ft3/s
T2 Elevation 350.25 ft T2 Flow 8.66 ft3/s
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Subsection: Outlet Input Data Return Event: 25 years
Label: Sed Basin I2 Storm Event: 25-YR
Structure ID: Orifice - 1
Structure Type: Orifice -Circular
Number of Openings
1
Elevation
350.80 ft
Orifice Diameter
6.0 in
Orifice Coefficient
0.600
Structure ID: Weir- 1
Structure Type: Rectangular Weir
Number of Openings
1
Elevation
353.00 ft
Weir Length
10.00 ft
Weir Coefficient
3.00 (ft^0.5)/s
Structure ID: TW
Structure Type: TW Setup, DS Channel
Tailwater Type
Free Outfall
Convergence Tolerances
Maximum Iterations
30
Tailwater Tolerance
0.01 ft
(Minimum)
Tailwater Tolerance
0.50 ft
(Maximum)
Headwater Tolerance
0.01 ft
(Minimum)
Headwater Tolerance
0.50ft
(Maximum)
Flow Tolerance (Minimum)
0.001 ft3/s
Flow Tolerance (Maximum)
10.000 ft3/s
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Index
Sed Basin Il (Outlet Input Data, 25 years) ... 1,2,3,4
Sed Basin I2 (Outlet Input Data, 25 years) ... 5, 6, 7, 8
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Subsection: Master Network Summary
Catchments Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event volume (hours) (k3/s)
(years) (ark)
SB-Il
Post -Development 1-
1
2.052
11.920
38.10
SB-Il
Post
R -Development 2-
2
2.640
11.920
48.46
Sl
Post -Development 10
10
4.408
11.920
78.67
Sl
Post -Development 25
25
5.611
11.920
98.70
Sl
Post -Development
100
7.802
11.920
134.57
100-YR
SB-I2
Post
R -Development 1-
1
1.033
11.920
19.18
SB-I2
Post
R -Development 2-
2
1.329
11.920
24.39
SB-I2
Post -Development 10
10
2.219
11.920
39.60
SB-I2
Post -Development 25
25
2.825
11.920
49.68
SB-I2
Post -Development
100
3.927
11.920
67.74
100-YR
Node Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event volume (hours) (k'/s)
(years) (ark)
0-SBIl
Post
R -Development 1-
1
1.849
12.040
22.83
0-SBIl
Post
R -Development 2-
2
2.398
12.040
30.57
0-SBI1
Post -Development 10
10
4.083
12.020
57.84
0-SBI1
Post -Development 25
25
5.268
12.010
75.80
0-SM
Post -Development
100
7.446
11.990
108.03
100-YR
0-SBI2
Post
R -Development 1-
1
0.986
12.040
12.48
0-SBI2
Post
R -Development 2-
2
1.276
12.000
19.56
0-SBI2
Post -Development 10
10
2.146
11.960
35.43
0-SBI2
Post -Development 25
25
2.727
11.960
44.34
0-SBI2
Post -Development
100
3.776
11.960
61.06
100-YR
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Subsection: Master Network Summary
Pond Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event Volume (hours) (fta/S)
(years) (ac-ft)
Maximum
Maximum
Water
Pond Storage
Surface
(ac-ft)
Elevation
(ft)
Post-
SB-Il (IN)
Development
1
2.052
11.920
38.10
(N/A)
(N/A)
1-YR
Post-
SB-Il (OUF)
Development
1
1.849
12.040
22.83
341.99
1.825
1-YR
Post-
SB-Il (IN)
Development
2
2.640
11.920
48.46
(N/A)
(N/A)
2-YR
Post-
SB-Il (OUF)
Development
2
2.398
12.040
30.57
342.35
1.965
2-YR
Post-
SB-Il (IN)
Development
10
4.408
11.920
78.67
(N/A)
(N/A)
10-YR
Post-
SB-Il (OtfF)
Development
10
4.083
12.020
57.84
343.03
2.233
10-YR
Post-
SB-Il (IN)
Development
25
5.611
11.920
98.70
(N/A)
(N/A)
25-YR
Post-
SB-Il (OtfF)
Development
25
5.268
12.010
75.80
343.37
2.374
25-YR
Post-
SB-Il (IN)
Development
100
7.802
11.920
134.57
(N/A)
(N/A)
100-YR
Post-
SB-Il (OUF)
Development
100
7.446
11.990
108.03
343.90
2.599
100-YR
Post-
SB-I2 (IN)
Development
1
1.033
11.920
19.18
(N/A)
(N/A)
1-YR
Post-
SB-I2 (OUF)
Development
1
0.986
12.040
12.48
353.22
0.891
1-YR
Post-
SB-I2 (IN)
Development
2
1.329
11.920
24.39
(N/A)
(N/A)
2-YR
Post-
SB-I2 (OtfF)
Development
2
1.276
12.000
19.56
353.36
0.916
2-YR
Post-
SB-I2 (IN)
Development
10
2.219
11.920
39.60
(N/A)
(N/A)
10-YR
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Subsection:
Master Network Summary
Pond Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Maximum
Maximum
Event
Volume
(hours)
(ft3/S)
Water
Pond Storage
(years)
(ac-ft)
Surface
(ac-ft)
Elevation
(ft)
Poi
SB-I2 (OUF)
Development
10
2.146
11.960
35.43
353.68
0.977
10-YR
Poi
SB-I2 (IN)
Development
25
2.825
11.920
49.68
(N/A)
(N/A)
25-YR
Poi
SB-I2 (OUF)
Development
25
2.727
11.960
44.34
353.89
1.019
25-YR
Poi
SB-I2 (IN)
Development
100
3.927
11.920
67.74
(N/A)
(N/A)
100-YR
Poi
SB-I2 (OUF)
Development
100
3.776
11.960
61.06
354.24
1.088
100-YR
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Appendix E — Example Deed Restrictions and blainntenance Agreements
This document was prepared by:
Albemarle County Attorney
County of Albemarle
401 McIntire Road
Charlottesville, Virginia22902
Tax Map and Parcel Number XXXXX-XX-XX-XXXXX
This deed is exempt from taxation under Virginia Code §§ 58.1-811(A)(3).
DEED OF DEDICATION AND EASEMENT
THIS DEED OF EASEMENT is made this _ day of DATE by and between XX
Grantors, and the COUNTY OF ALBEMARLE, VIRGINIA, a political subdivision of the
Commonwealth of Virginia, Grantee.
WITNESS:
WHEREAS, the Grantors are the owners of that certain real property (hereinafter the
"Property") located in Albemarle County, Virginia, more particularly described as follows ADD
PROPERTY DESCRIPTION
WHEREAS, the Grantors seek to dedicate for public use those portions of the Property
shown as "Plat Showing SWM Forest and Open Space Easement' shown on the plat of PLAT E
BY WHOM, a copy of which is attached hereto to be recorded with this deed (hereinafter, the
"Easement" and the "Plat"). Reference is made to the Plat for a more particular description of the
easement conveyed herein; and
WHEREAS, the Grantors and the Board of Supervisors of Albemarle County, Virginia have
entered into an agreement entitled "Stormwater Management Facilities Maintenance Agreement"
(hereinafter, the "Maintenance Agreement"), a fully executed copy of which is attached to this
deed as Exhibit A, in which the Grantors have agreed to construct and maintain on -site
stormwater managementBMP facilities; and
WHEREAS, the Maintenance Agreement provides in part that the Grantors give permission
to the County, including its authorized agents and employees, to enter upon the Property and to
inspect the stormwater management/BMP facilities whenever the County deems necessary; and
the Maintenance Agreement also provides in part that, in the event the Grantors, its successors
and assigns, fails to maintain the stormwater managementBMP facilities in good condition
acceptable to the County, the County may enter upon the Property and take whatever steps
necessary to repair or otherwise maintain the facilities and to otherwise correct deficiencies.
Version: 11/25/14
WHEREAS, it is the desire and intent of the Grantors to dedicate, grant and convey an
Easement for public use in accordance with this Deed of Dedication and Easement.
NOW, THEREFORE, in consideration of the premises and TEN DOLLARS ($10.00), cash
in hand paid, and other good and valuable consideration, the receipt of which is hereby
acknowledged, the Grantors do hereby GRANT, CONVEY, and DEDICATE to public use with
GENERAL WARRANTY and ENGLISH COVENANTS OF TITLE unto the Grantee, its
successors and assigns, a perpetual easement as shown on the Plat and as referred to herein as the
Easement.
The Easement shall be subject to the following:
1. Right of ingress and egress. The Grantee and its authorized agents and employees shall
have the right and easement of ingress and egress over the Property to perform all acts to which
the parties have agreed it may perform under the Maintenance Agreement.
2. Ownership of the facilities. The stormwater managementBMP facilities required to be
constructed and maintained by the Grantors under the Maintenance Agreement shall be and
remain the property of the Grantors. This Deed of Dedication and Easement shall not be
construed to be an assumption of ownership or control by the Grantee over the stormwater
managementBMP facilities subject to the Maintenance Agreement.
3. No obligation on Grantee to inspect or maintain. This Deed of Dedication and Easement
shall not be construed as imposing an obligation on the Grantee to repair or otherwise maintain
the stormwater management/BMP facilities subject to the Maintenance Agreement.
4. Grantee's right to assign. The Grantee shall have the right to assign this Easement as its
interests may require.
5. Binding effect. The Easement and the rights and obligations established herein shall run
with the land in perpetuity, and shall be binding upon the Grantors, the Grantee, and their
successors and assigns. All references herein to the "Grantors" and the "Grantee" include their
respective successors and assigns. All references to the "Grantee," when exercising any right or
obligation herein, includes the Grantee's officers, employees and agents.
The Grantee, acting by and through its County Executive, duly authorized by resolution
adopted by the Board of Supervisors of the County of Albemarle, Virginia, accepts the
conveyance of this property pursuant to Virginia Code § 15.2-1803, as evidenced by the County
Executive's signature hereto and the recordation of this Deed.
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Version: 11/25/14
WITNESS the following signatures.
M T.W""
By: NAME
By: NAME
COMMONWEALTH OF VIRGINIA
CITY/COUNTY OF
The foregoing instrument was acknowledged before me this _ day of DATE, 2018 by
NAME.
Notary Public
My Commission Expires:
Registration number:
GRANTEE:
COUNTY OF ALBEMARLE, VIRGINIA
Thomas C. Foley
County Executive
Version: 11/25/14
COMMONWEALTH OF VIRGINIA
CITY OF CHARLOTTESVILLE:
The foregoing instrument was acknowledged before me this _ day of
by Thomas C. Foley, County Executive, on behalf of the County of Albemarle, Virginia,
Grantee.
My Commission Expires:
Registration number:
Approved as to form:
County Attorney
Notary Public
4
Version: 11/25/14
This document was prepared by:
XX
XX
XX
Tax Map Parcel: XX=-XX-XX-XXXXX
TO MAINTAIN
STORMWATER MANAGEMENT FACILITIES AND OTHER TECHNIQUES
THIS AGREEMENT is entered into by and between NAME, hereinafter called the "Owner,"
and the COUNTY OF ALBEMARLE, VIRGINIA, a political subdivision of the Commonwealth
of Virginia, hereinafter called the "County."
RECITALS
R-1. The Owner is the fee simple owner of certain real property described as Albemarle County
Tax Map Parcel #, and more particularly described in a deed to Owner dated XX and recorded in
the Clerk's Office of the Circuit Court of Albemarle County, Virginia, in Deed Book XY, page XX,
hereinafter called the "Property"; and
R-2. The Owner is proceeding to build on and develop the Property and XX; and
R-3. The Property is within the County's Municipal Separate Storm Sewer System (hereinafter,
"MS4'� jurisdictional area, and
R-4. The Site Plan identified as SDP 2018- was approved and, in conjunction
therewith, a Stormwater Management Plan, identified as WPO-2018- , hereinafter called the
"Plan," which is expressly made a part hereof, as approved or to be approved by the County, and
which provides for the detention and water quality treatment of stormwater within the confines of
the Property, and
R-5. The Plan and the land disturbing activity related thereto are subject to the Virginia
Stormwater Management Act (Virginia Code § 62.1-44.15:24 et seq.), as implemented in part by
Chapter 17, Water Protection, of the Albemarle County Code; and
R-6. 9VAC25-870-112 and Albemarle County Code § 17-415 require the Owner and the County
to enter into this agreement in order to ensure the long-term maintenance of the permanent
stormwater management facilities and/or other techniques required to serve the Property and, for
those facilities within the County's MS4 jurisdictional area, 9VAC25-890-40 imposes additional
requirements, and the County implements 9VAC25-870-112 and 9VAC25-890-40 through
Version: 01/17/17
Albemarle County Code § 17-415 and this Agreement; and
R-7. For those facilities within the County's MS4 jurisdictional area, this Agreement also
addresses, in part, the County's obligations under Minimum Control Measure Number 5 (post -
construction stormwater management) in the Albemarle County 5-Year MS4 General Permit and
Program Plan; and
R-8. Albemarle County Code § 17-415 requires that permanent on -site stormwater management
facilities and/or other techniques, as shown on the Plan, including all pipes and channels built to
convey stormwater to and from the facilities, all structures, berms, inlet and outlet structures, pond
areas, filtration media, and forested and open space areas (which are considered to be a
nonstructural technique to meet stormwater management requirements), provided to control the
quantity and quality of the stormwater, access roads, and any other improvement that may affect the
proper functioning of the Facilities (hereinafter, "stormwater management facilities and other
techniques" are referred to individually as a "Facility" and collectively the "Facilities' be
constructed and adequately maintained by the Owner in perpetuity.
In consideration of the foregoing premises, the mutual covenants contained herein, and the
following terms and conditions, the parties hereto agree as follows:
1. Obligation of the Owner to construct the Facilities. The Owner shall construct and
protect the Facilities that are required to be constructed, and shall do so in accordance with the
Virginia Stormwater Management Act plans and specifications identified in the Plan.
2. Obligation of the Owner to maintain the Facilities. The Owner shall maintain the
Facilities in good working condition for so long as the Facilities exist, in a manner that meets or
exceeds the maintenance standards provided herein, subject to the following:
A. "Good working condition" defined. For the purposes of this Agreement, a Facility is
in "good working condition" when it performs its design function in accordance with the plans and
specifications identified in the Plan, including all conditions imposed in conjunction with approval
of the Plan, and complies with all applicable statu, as determined by the Albemarle County Engineer
(hereinafter, the "County Engineer'.
B. "Maintain and maintenance" defined. For the purposes of this Agreement,
"maintain" and "maintenance" include, but are not limited to maintaining, repairing, replacing,
reconstructing, preserving, and restoring the Facilities or any part thereof necessary to comply with
the plans and specifications identified in the Plan.
C. Maintenance schedule. The Owner shall maintain the Facilities in compliance with the
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Version: 01/17/17
maintenance schedule in the approved Plans as required under Albemarle County Code § 17-
403(A)(5).
D. Professional engineer may be required to direct work The County Engineer may
require that specific maintenance work be performed under the direction of a professional engineer.
3. Inspections and the Inspection Report by the Owner. The Owner shall have the
Facilities inspected to ensure that the Facilities are in good working condition, subject to the
following:
A. Who may inspect the Facilities. The Facilities shall be inspected by the Owner or
upon written demand by the County Engineer by a person who: (1) is licensed as a professional
engineer, architect, landscape architect, or land surveyor pursuant to Virginia Code § 54.1-400 et seq.;
(2) works under the direction and oversight of the licensed professional engineer, architect,
landscape architect, or land surveyor referenced in subsection (A)(1); or (3) who holds an
appropriate certificate of competence from the State Water Control Board.
B. What must be inspected. The inspections shall be conducted according to the
requirements of 9VAC25-870, et seq. or as that section is hereafter amended.
C. When inspections shall be conducted. The Facilities shall be inspected as specified in
the approved Plans or by the County Engineer.
D. What documents must be maintained. The inspection shall be documented on a
form provided by the County Engineer and shall be completed to the satisfaction of the County
Engineer (hereinafter, the "Inspection Report'. At a minimum, the Inspection Report shall provide,
as applicable, the date of the inspection, the name of the inspector, a description of the condition of
all pipes and channels built to convey stormwater to and from the facilities, all structures, berms,
inlet and outlet structures, pond areas, filtration media, forested and open space, vegetation provided
to control the quantity and quality of the stormwater, access roads, and any other improvement that
may affect the proper functioning of the Facilities, a list of all deficiencies causing the Facilities not
to be in good working condition, including all control measures not operating effectively and all
control measures that are inadequate, a list of required maintenance work to be performed so that
the Facilities are restored to good working condition, and the date by which the maintenance work
will be performed.
E. To whom and when an Inspection Report must be submitted. The Owner shall
submit the Inspection Report and any other requested inspected documentation to the Director,
Albemarle County Department of Facilities and Environmental Services, 401 McIntire Road,
Version: 01/17/17
Charlottesville, Virginia 22902 or a successor department, office and address delineated by the
County to the Owner. The Owner shall provide the Inspection Report to the Department within
thirty (30) days after completion of the inspection.
F. Section 3 satisfied if County conducts inspection in any_yea r. The Owner's
obligation to have the Facilities inspected and to submit an Inspection Report under Section 3 shall
be deemed to be satisfied in any inspection period in which the County conducts an inspection
under Section 4 and as provided in Albemarle County Code § 17-811.
G. Inspection Period defined. For the purposes of this Agreement, inspection period
means the one-year period beginning and ending on the anniversary of the date of this Agreement
first hereinabove written.
4. Permission to the County to inspect the Facilities. The Owner hereby grants permission
to the County, including its authorized agents and employees, to enter upon the Property and to
inspect the Facilities whenever the County deems an inspection to be necessary, subject to the
following:
A. Purposes for County inspection. The County may inspect the Facilities for the
purpose of determining the condition of the Facilities including, but not limited to, determining
whether the Facilities are in good working condition, investigating any deficiencies reported in the
Inspection Report, responding to citizen complaints about the Facilities, and inspecting or observing
any maintenance of the Facilities.
B. Prior notice to the Owner not required. The County shall not be required to provide
prior notice to the Owner to enter the Property to conduct the inspection.
C. Inspection findings and demand for maintenance. The County shall provide the
Owner with a copy of the findings of its inspection of the Facilities. If the inspection concludes that
maintenance of any of the Facilities is required, the County also shall provide the Owner with a
demand that the Owner maintain the Facilities and the date by which the maintenance work must be
completed.
5. The Owner's response to the Inspection, the Inspection Report or the Countv's
demand for maintenance. The Owner shall comply with the following:
A. Corrective action. If the inspection identifies the need for a corrective action, it shall be
completed as follows: (i) if an inspection identifies a Facility that is not operating effectively, the
Owner shall complete corrective action as soon as practicable, but no later than seven (7) days after
discovery or a longer period allowed in writing by the County Engineer, (ii)
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Version: 01/17/17
if an inspection identifies an existing Facility that needs to be modified or if an additional control
measure is necessary, implementation shall be completed prior to the next anticipated measureable
storm event, if implementation before the next anticipated measureable storm event is impractical,
then it shall be implemented no later than seven (7) days after discovery or a longer period allowed
in writing by the County Engineer. The term "control measure" means any best management
practice or stormwater facility, or other method used to minimize the discharge of pollutants to
State waters, or otherwise restrict or alter the hydraulics of stormwater flow and discharge.
B. Maintenance. If the Inspection Report under Section 3 or the inspection conducted by
the County under Section 4 identifies Facility deficiencies, the Owner shall promptly complete the
maintenance work by the date specified in the Inspection Report or as demanded by the County.
When the maintenance work is completed, the person performing or directing the work shall certify
to the County that the Facilities are in good working condition.
6. Right of the County to enter the Properly to maintain the Facilities. If the Owner fails
to maintain the Facilities in good working condition as required by Section 2 or fails to complete
timely maintenance work as required by Section 5, the County, including its authorized agents and
employees, may enter upon the Property and take whatever steps necessary to bring the Facilities
into good working condition and to otherwise correct all deficiencies identified in the Inspection
Report under Section 3 or the inspection conducted by the County under Section 4, subject to the
following:
A. No right to erect permanent structures; exceptions. The County's right to take
"whatever steps necessary" shall not be construed to allow the County to erect any structure of a
permanent nature on the Property unless: (1) the structure is required to ensure that the Facilities
perform their design functions; or (2) it is a structure to house equipment to monitor the Facilities
and any fencing related thereto.
B. County not obligated to maintain the Facilities. It is expressly understood and
agreed that the County is under no obligation to repair or otherwise maintain the Facilities, and in
no event shall this Agreement be construed to impose any such obligation on the County.
7. Right of the County to charge the Owner for its costs of maintenance; obligation of
the Owner to reimburse the County. If the County performs any maintenance work on the
Facilities under Section 6, it will charge to the Owner all of the County's costs including, but not
limited to, those costs for labor, equipment, supplies, materials, and project or contract
administration. The Owner shall reimburse the County for its costs, subject to the following:
Version: 01/17/17
A. Written demand. The County shall send to the Owner a written demand for payment
of all of its costs. The demand may be sent by first class mail to the address to which County real
property tax bills are mailed or to another address provided by the Owner to the County.
B. Timely payment The Owner shall reimburse the County for the costs identified in the
County's written demand within thirty (30) days after the date of the written demand.
C. Collection by County. The County may collect any amount not timely reimbursed by
the Owner in any manner authorized by law and may place a lien against the Property in the amount
of the non -reimbursed costs, plus interest at the rate authorized by law.
8. Obligation of the Owner to indemnify and hold harmless the County. The following
shall apply to this Agreement:
A. No County liability. This Agreement imposes no liability of any kind whatsoever on
the County, including its agents, officers and employees.
B. Obligation of the Owner to indemnify and hold harmless. The Owner shall
indemnify and hold harmless the County, including its agents, officers and employees, for any and all
damages, accidents, casualties, occurrences or claims which might arise or be asserted against the
County, including its agents, officers and employees, resulting from the failure of the Facilities to
perform their design function or to otherwise operate properly, any repairs, maintenance,
construction, or any other acts performed by the County or the Owner, including their respective
agents, officers and employees, related to the Facilities, regardless of how those acts were
performed; or the Facilities' existence.
C. Notice of and defense of actions. If a claim is asserted against the County, including
its agents, officers and employees, based upon any of the indemnities in subsection (B), the County
shall promptly notify the Owner of the claim. The Owner shall defend, at its expense, any lawsuit or
other action arising therefrom. If, as a result of a claim, any judgment is allowed against the County,
its agents, officers and employees, or any of them, the Owner shall pay all damages, costs, expenses
and fees associated with the judgment.
9. References to County departments and officers; successors. Any reference in this
Agreement to a County department or office includes its successor department or office as
determined by the County.
10. Covenant running with the land. This Agreement shall be recorded by the County in the
Clerk's Office of the Circuit Court of Albemarle County, Virginia, shall constitute a covenant
running with the land, and shall be binding on the Owner, its administrators, executors, assigns,
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Version: 01/17/17
heirs and any other successors in interests, including any homeowners' association.
11. Date of this Agreement. This Agreement shall be deemed to have been entered into by the
parties and shall be effective on and after the date it is signed by the Albemarle County Executive.
WITNESS the following signatures:
NAME
R : ul
STATE OF
CITY/COUNTY OF
The foregoing instrument was acknowledged before me this _ day of DATE by NAME
My Commission Expires:
Registration Number:
Notary Public
COUNTY OF ALBEMARLE, VIRGINIA
7
Version: 01/17/17
IN
Thomas C. Foley
County Executive
COMMONWEALTH OF VIRGINIA
CITY/COUNTY OF
The foregoing instrument was acknowledged before me this _ day of
by Thomas C. Foley, County Executive, on behalf of the Board of Supervisors of Albemarle
County, Virginia.
Notary Public
My Commission Expires:
Registration Number:
Approved as to Form:
County Attorney Date
Version: 01/17/17