HomeMy WebLinkAbout7.0 Stormwater Design Report (PH 1) 2020.03.20
DESIGN REPORT
STORMWATER MANAGEMENT
JENNIFER PLACE CONDOMINIUMS
PHASE 1-6 SITE PLAN
LOT 1, BLOCK 9
LAUREL GLEN SUBDIVISION PHASE 1
Prepared for:
Great Western Investment, LLC
15525 Horse Creek Road
Bozeman, MT 59715
Prepared by:
Project Number: 190065
March 2019
INTRODUCTION
The Jennifer Place Condominium Master Site Plan proposes to develop Lot 1, Block 9, Laurel
Glen Subdivision Phase 1. The proposed development consists of 12 – 2 unit condominiums with
a proposed access road and associated utilities. A combination of site grading, curb and gutter,
drainage swales and retention ponds will be used to manage stormwater runoff on the site. The
proposed stormwater design limits the runoff from the development to below the allocated amount
for the lot, and retains the balance on site.
EXISTING STORMWATER DESIGN
Existing City stormwater infrastructure was installed with the Laurel Glen Subdivision, Phase 1
infrastructure improvements. In the 2002 Laurel Glen Subdivision, Phase 1 Stormwater Design
Report prepared by Allied Engineering, Inc. the lot was designated as commercial neighborhood
(B-1) for runoff estimation. A C value of C=0.60 was applied to the lot to estimate the runoff
generated from future development on the lot. Based on the original C value applied to the lot and
the City of Bozeman 10-Year 2-Hour design storm, the lot was allocated 3,617 cf of runoff to the
subdivision detention pond. Relevant portions of the 2002 Laurel Glen Subdivision, Phase 1
Stormwater Design Report is included in Appendix C of this report. The proposed layout (Phases
1-6 only) has a weighted C value of 0.54 which generates 3,243 cf of runoff, using the City of
Bozeman design storm. Supporting calculations and drainage area maps are included in
Appendices A & B, respectively.
PROPOSED STORMWATER DESIGN
The site was divided into 3 main drainage areas as shown on the Proposed Drainage Area Map
included in Appendix B. Runoff produced from Drainage Area 1 will be retained and infiltrated
on site. Drainage Area 1 consists of the proposed drive aisle, a portion of the landscaping on the
eastern side of the drive aisle, and the Phase 6 building and driveway.. The runoff produced from
these areas will drain to the eastern side of the curb and gutter in the proposed drive aisle. From
there, they will flow to a low point and across a curb chase into Proposed Retention Pond 1. The
runoff coefficient for Drainage Area 1 is 0.57 over an area of 30,701 sf which translates to 1,185
cf of runoff. Drainage Area 1 will be retained in Retention Pond 1 located at the northeast corner
of the site. Retention Pond 1 has a storage volume of 1,346 cf, a top of pond elevation of 4832.02’,
a bottom elevation of 4830.52’, and 4:1 (H:V) side slopes.
Drainage Area 2 consists of the roofs, landscape and hardscape areas on the west and south sides
of the access road. The contributing landscape, roof, and driveway areas in Drainage Area 2 will
drain to the south/west curb and gutter in the proposed drive aisle. Unlike Drainage Area 1 the low
point of the curb is the connection to the drive access. Therefore, Drainage Area 2 will runoff into
Annie Street which drains to existing subdivision stormwater infrastructure. Drainage Area 2 has
a runoff coefficient of 0.58 over an area of 46,058 sf which translates to 1,817 cf of runoff.
Drainage Area 3 consists of a portion of the access road and landscape areas on the east and south
sides of the lot. These areas will drain to Laurel Parkway and then to the existing city stormwater
infrastructure. Drainage Area 3 has a composite C value of 0.29 over an area of 12,134 sf, which
translates to 237 cf of runoff. Combined, Drainage Areas 2 & 3 will contribute 2,054 cf of runoff
to the subdivision infrastructure which is less than the 3,617 cf that the B-1 lot was estimated to
generate in the 2002 Allied Engineering report.
APPENDIX A
STORMWATER CALCULATIONS
PRE-DEVELOPMENT RUNOFF VOLUME
1. Calculate Area and Weighted C Factor
Contributing Area C Area (ft 2)C * Area
Design C-Value 0.6 88944 53366.4
Total 88944 53366
C=Weighted C Factor 0.60
2. Calculate Required Volume
Q = CIA
V=7200Q
C = Weighted C Factor 0.60
I = intensity (in/hr) 0.41 (10 yr, 2hr storm)
A = Area (acres) 2.04
Q = runoff (cfs) 0.50
V = RUNOFF VOL (ft3)3617
OVERALL SITE
REQUIRED VOLUME
1. Calculate Area and Weighted C Factor
Contributing Area C Area (ft 2)C * Area
Hardscape 0.95 18443 17521
Roofs 0.95 21642 20560
Landscape 0.2 48859 9772
Total 88944 47853
C=Weighted C Factor 0.54
2. Calculate Required Volume
Q = CIA
V=7200Q
C = Weighted C Factor 0.54
I = intensity (in/hr) 0.41 (10 yr, 2hr storm)
A = Area (acres) 2.04
Q = runoff (cfs) 0.45
V = RUNOFF VOL (ft3)3243
REQUIRED RETENTION VOLUME (ft3)0
DRAINAGE AREA 1
REQUIRED VOLUME
1. Calculate Area and Weighted C Factor
Contributing Area C Area (ft 2)C * Area
Hardscape 0.95 11312 10746
Roof 0.95 3822 3630
Landscape 0.2 15568 3114
Total 30701 17490
C=Weighted C Factor 0.57
2. Calculate Required Volume
Q = CIA
V=7200Q
C = Weighted C Factor 0.57
I = intensity (in/hr) 0.41 (10 yr, 2hr storm)
A = Area (acres) 0.70
Q = runoff (cfs) 0.16
V = REQUIRED STORAGE VOL. (ft3)1185
DRAINAGE AREA 2
REQUIRED VOLUME
1. Calculate Area and Weighted C Factor
Contributing Area C Area (ft 2)C * Area
Hardscape 0.95 5700 5415
Roof 0.95 17771 16882
Landscape 0.2 22587 4517
Total 46058 26815
C=Weighted C Factor 0.58
2. Calculate Required Volume
Q = CIA
V=7200Q
C = Weighted C Factor 0.58
I = intensity (in/hr) 0.41 (10 yr, 2hr storm)
A = Area (acres) 1.06
Q = runoff (cfs) 0.25
V = RUNOFF VOL TO SUBDIVISION (ft3)1817
DRAINAGE AREA 3
REQUIRED VOLUME
1. Calculate Area and Weighted C Factor
Contributing Area C Area (ft 2)C * Area
Hardscape 0.95 1430 1359
Landscape 0.2 10704 2141
Total 12134 3500
C=Weighted C Factor 0.29
2. Calculate Required Volume
Q = CIA
V=7200Q
C = Weighted C Factor 0.29
I = intensity (in/hr) 0.41 (10 yr, 2hr storm)
A = Area (acres) 0.28
Q = runoff (cfs) 0.03
V = RUNOFF VOL. TO SUBD. (ft3)237
APPENDIX B
DRAINAGE AREA MAP
APPENDIX C
2002 LAUREL GLEN SUBDIVISION
STORMWATER DESIGN REPORT (ALLIED
ENGINEERING, INC.)
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