2019 08 02 - CBA Carmel Stormwater Drainage Technical Report
Stormwater Management Plan For:
CHRISTIAN BROTHERS
AUTOMOTIVE SERVICE CENTER
Prepared for:
Christian Brothers Automotive Corporation
Jonathan Wakefield
17725 Katy Freeway | Suite 200
Houston, TX 77094
Prepared by:
Progressive Architecture Engineering, P.C.
1811 4 Mile Road NE
Grand Rapids, MI 49525-2442
616/361-2664
August 2, 2019
Project No: 70050012
TABLE OF CONTENTS
INTRODUCTION ........................................................................................................................................... 1
EXISTING CONDITIONS .............................................................................................................................. 1
PROPOSED DEVELOPMENT...................................................................................................................... 1
Design Standards ..................................................................................................................................... 1
Proposed Storm Pipe Network ................................................................................................................. 1
Water Quality ........................................................................................................................................... 1
Detention ................................................................................................................................................. 1
APPENDICIES
Appendix 1 Existing Conditions Drainage Area Map
Appendix 2 Post-Development Drainage Area Map – Pipe Network Sizing
Appendix 3 Post-Development Drainage Area Map – Detention Sizing
Appendix 4 Stormwater Design Calculations
STORMWATER MANAGEMENT PLAN
Christian Brothers Automotive Service Center 70050012 Stormwater Management Plan Page 1
INTRODUCTION
Christian Brothers Automotive Service center is the first project as part of the overall development,
“Michigan Road Retail Site Development.” The 5,660 square foot automotive service building is proposed
on a 1.23-acre parcel with proposed parking, dumpster enclosure and landscaping.
In 2018, plans were approved for a multi-family housing development, “Aria.” As part of this development,
a large detention basin and water quality units were sized to accommodate both the Aria Development as
well as the parcel to the east, Michigan Road Retail Site Development, which the Christian Brothers
property is part of.
EXISTING CONDITIONS
The existing parcel is an open field with fallow ground cover. The east quarter of the property drains to a
low point on the east side and the rest of the site drains to the west where it collects and pools in low
areas. The existing soil is silty clay and loam with poor infiltration. Appendix 1 shows a drainage area map
of existing conditions.
PROPOSED DEVELOPMENT
Design Standards
The proposed stormwater management plan is designed in accordance with “The City of Carmel
Stormwater Technical Standards Manual.”
Proposed Storm Pipe Network
The proposed Christian Brothers stormwater pipe network is designed to handle the stormwater
discharge of a 10-year storm event and provide 2-1/2 feet minimum cover at all catch basins. The storm
runoff will be collected in catch basins around the site and discharge to a catch basin in Redd Road,
proposed as part of the Redd Road extension. The building roof runoff will collect in underdrains and
connect to catch basins at the front and rear of the building. The landscaped area behind the building and
on the east side of the building will be graded to provided adequate drainage to several yard drains.
Appendix 2 shows a drainage area map to each catch basin for pipe network sizing and includes off site
drainage.
Water Quality
Water quality for the proposed Christian Brothers site will be treated off-site on the Aria Development.
Water quality will be provided with 3 mechanical water quality units sized to serve both the multi-family
development and the Michigan Road Retail Site Development, which includes the Christian Brothers site.
Please refer to the “Stormwater Technical Report for Michigan Road Site” which was approved for the
Aria Development and Michigan Road Retail Development for more details on the water quality units.
Detention Basins
Stormwater detention and restricted release will be provided by a large detention basin on the Aria
Development site. This detention basin will store water for the multi-family development and the Michigan
Road Retail Site Development, which includes the Christian Brothers site. Appendix 3 shows a drainage
area map used for detention sizing calculations. The runoff curve number for the proposed Christian
Brothers site is 91 and the detention sizing calculations assumed a runoff curve number of 92.8 for this
commercial development. Please refer to the “Stormwater Technical Report for Michigan Road Site”
which was approved for the Aria Development and Michigan Road Retail Development for more details
on the detention sizing and release rates.
STORMWATER MANAGEMENT PLAN
Christian Brothers Automotive Service Center 70050012 Stormwater Management Plan
APPENDIX 1
Existing Conditions Drainage Area Map
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DRAINAGE AREA PERVIOUS AREA IMPERVIOUS AREA RUNOFF CURVE NUMBER
TOTAL PROPERTY AREA 1.23 Ac 1.23 Ac 0.00 Ac 90
PERVIOUS AREA IS FALLOW CROP RESIDUE (CR) IN GOOD CONDITION - HYDROLOGIC SOIL GROUP D
-EXISTING FALLOW LAND
STORMWATER MANAGEMENT PLAN
Christian Brothers Automotive Service Center 70050012 Stormwater Management Plan
APPENDIX 2
Post-Development Drainage Area Map – Pipe Network Sizing
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70050012
JPM
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CATCH BASIN DRAINAGE AREA PERVIOUS AREA IMPERVIOUS AREA
CB-1 0.08 Ac 0.03 Ac 0.05 Ac
CB-2 0.01 Ac 0.01 Ac 0.00 Ac
CB-3 0.05 Ac 0.00 Ac 0.05 Ac
CB-4 0.17 Ac 0.03 Ac 0.14 Ac
CB-5 0.28 Ac 0.02 Ac 0.26 Ac
YD-3A 0.34 Ac (0.25 Ac off-site) 0.33 Ac 0.01 Ac
YD-3B 0.23 Ac (0.14 Ac off-site)0.19 Ac 0.04 Ac
YD-3C 0.20 Ac (0.01 Ac off-site)0.18 Ac 0.02 Ac
YD-5A 0.29 Ac (0.24 Ac off-site)0.28 Ac 0.01 Ac
DRAINAGE AREA TO
CBA CATCH BASINS 1.65 Ac 1.07 Ac 0.58 Ac
Total Off-site drainage area to CBA catch basins = 0.64 Acres
DRAINAGE AREA
MAP - PIPE
NETWORK SIZING
-ON-SITE DRAINAGE AREA
-OFF-SITE DRAINAGE AREA
-PERVIOUS AREA
STORMWATER MANAGEMENT PLAN
Christian Brothers Automotive Service Center 70050012 Stormwater Management Plan
APPENDIX 3
Post-Development Drainage Area Map – Detention Sizing
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DRAINAGE AREA MAP - DETENTION SIZING
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ISSUANCES
DRAWN BY
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PROJECT MANAGER
FILE NUMBER
CHECKED BY
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70050012
JPM
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DRAINAGE AREA
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SIZING
DRAINAGE AREA PERVIOUS AREA IMPERVIOUS AREA RUNOFF CURVE NUMBER RATIONAL RUNOFF COEFFICIENT
TOTAL PROPERTY AREA 1.23 Ac 0.50 Ac 0.73 Ac 91 0.59
* PERVIOUS AREA IS OPEN SPACE IN GOOD CONDITION - HYDROLOGIC SOIL GROUP D
*IMPERVIOUS AREA IS PAVED PARKING LOTS, ROOFS, AND DRIVEWAYS - HYDROLOGIC SOIL GROUP D
*DETENTION CALCULATIONS FOR ARIA APARTMENT DETENTION BASIN ASSUMED A RUNOFF CURVE NUMBER OF 92.8 FOR THIS PROPERTY.
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Name A B C D Condition of Cover of Basin A B C D CN
DEV 0% 0% 39% 61% Impervious (Pond Area) 8% 98 98 98 98 98.0
0% 0% 39% 61% Commercial 70% 89 92 94 95 94.6
0% 0% 39% 61% Open Space, Good Cond. 22% 39 61 74 80 77.7
DEV 100%91.2
FUT DEV 0% 0% 48% 52% Commercial 90% 89 92 94 95 94.5
0% 0% 48% 52% Open Space, Good Cond. 10% 39 61 74 80 77.1
FUT DEV 92.8
OFF-N 0% 80% 20% 0% Impervious 2% 98 98 98 98 98.0
0% 80% 20% 0% Open Space, Good Cond. 98% 39 61 74 80 63.6
OFF-N 64.3
OFF-E 0% 70% 30% 0% Impervious 12% 98 98 98 98 98.0
0% 70% 30% 0% Open Space, Good Cond. 88% 39 61 74 80 64.9
OFF-E 68.9
Weighted Curve Project:Michigan Road Site
Number Calculations Date:6/29/2018
Prepared By:TPG
Soil Group % Curve Number (CN)
Job No.:W17-0567
Proposed Conditions Checked By:KCS
WinTR-55 Current Data Description
--- Identification Data ---
User: ShortJ Date: 7/31/2019
Project: 70050012 - CBA Carmel Units: English
SubTitle: Stormwater Runoff Calculations Areal Units: Acres
State: Indiana
County: Hamilton NOAA_A
Filename: P:\70050012\WIP DRAWINGS\Civil\Calcs\TR-55 Stormwater Runoff Data - Drainage Area and Total Property.w55
--- Sub-Area Data ---
Name Description Reach Area(ac) RCN Tc
------------------------------------------------------------------------------
CBA SITE PROPERTY AREA Outlet 1.23 91 .145
Total area: 1.23 (ac)
--- Storm Data --
Rainfall Depth by Rainfall Return Period
2-Yr 5-Yr 10-Yr 25-Yr 50-Yr 100-Yr 1-Yr
(in) (in) (in) (in) (in) (in) (in)
--------------------------------------------------------------------------------
2.85 3.53 4.06 4.81 5.4 6.02 2.37
Storm Data Source: Hamilton NOAA_A County, IN (NRCS)
Rainfall Distribution Type: Type II
Dimensionless Unit Hydrograph: <standard>
WinTR-55, Version 1.00.10 Page 1 7/31/2019 1:45:27 PM
ShortJ 70050012 - CBA Carmel
Stormwater Runoff Calculations
Hamilton NOAA_A County, Indiana
Sub-Area Land Use and Curve Number Details
Sub-Area Hydrologic Sub-Area Curve
Identifier Land Use Soil Area Number
Group (ac)
--------------------------------------------------------------------------------
CBA SITE Open space; grass cover > 75% (good) D .5 80
Paved parking lots, roofs, driveways D .73 98
Total Area / Weighted Curve Number 1.23 91
==== ==
WinTR-55, Version 1.00.10 Page 1 7/31/2019 1:45:27 PM
STORMWATER MANAGEMENT PLAN
Christian Brothers Automotive Service Center 70050012 Stormwater Management Plan
APPENDIX 4
Stormwater Design Calculations
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18
19
20
21 22 23 24 25 26 27 28 29 30
Pr
o
p
o
s
e
d
P
i
p
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N
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t
w
o
r
k
Dr
a
i
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a
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A
r
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&
C
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g
n
F
l
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w
Fu
l
l
F
l
o
w
C
o
n
d
i
t
i
o
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s
Hydraulic Grade Line Elevation Actual Flow Conditions
Up
p
e
r
St
r
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c
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I
D
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r
St
r
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of
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p
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R
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v
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w
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R
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Ele
v
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In
l
e
t
D
r
a
i
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a
g
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Ar
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a
(
a
c
r
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s
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h
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x
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f
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1/2
(c
f
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s
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a
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.
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9
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n
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x
Ax
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2/3
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l
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t
y
(
f
t
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Tim
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o
f
F
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w
(m
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Slope of Energy Grade Line (ft/ft)Frictional Losses (ft)Minor Losses 1/2(V2 /2g) (ft)Total Hydraulic Head Loss (ft) HGL Upper* HGL LowerDepth of Hydraulic Grade Line below Upper Rim ElevationVelocityDepth of Flow (feet)Percent Full (D/do)
YD
-
3
C
YD
-
3
B
12
1
0
0
0
.
3
8
%
89
5
.
7
0
8
9
5
.
3
2
89
9
.
2
0
89
9
.
0
0
0
.
2
0
0
.
3
2
5
.
0
0
0
.
0
6
0
.
0
6
6
.
1
2
0
.
3
9
2
.
2
0
3
5
.
6
3
2
.
8
0
0
.
6
0
0
.
0
0
0
0
.
0
1
2
0
.
0
3
0
0
.
0
4
2
8
9
5
.
9
6
8
9
5
.
9
2
3
.
2
4
1
.
9
6
0
.
2
5
2
5
.
0
0
%
YD
-
3
B
YD
-
3
A
12
1
0
0
0
.
3
0
%
89
5
.
2
2
8
9
4
.
9
2
89
9
.
0
0
89
8
.
9
0
0
.
2
3
0
.
3
7
5
.
6
0
0
.
0
9
0
.
1
5
6
.
1
2
0
.
9
1
1
.
9
5
3
5
.
6
3
2
.
4
8
0
.
6
7
0
.
0
0
1
0
.
0
6
5
0
.
0
4
3
0
.
1
0
9
8
9
5
.
9
2
8
9
5
.
8
1
3
.
0
8
2
.
3
6
0
.
4
5
4
5
.
0
0
%
YD
-
3
A
CB
-
3
12
8
9
0
.
3
0
%
89
4
.
8
2
8
9
4
.
5
6
89
8
.
9
0
89
9
.
7
5
0
.
3
4
0
.
2
7
6
.
2
7
0
.
0
9
0
.
2
4
6
.
1
2
1
.
4
7
1
.
9
5
3
5
.
6
3
2
.
4
8
0
.
6
0
0
.
0
0
2
0
.
1
5
2
0
.
0
5
5
0
.
2
0
7
8
9
5
.
8
1
8
9
5
.
6
0
3
.
0
9
2
.
6
7
0
.
6
0
6
0
.
0
0
%
YD
-
5
A
CB
-
5
12
1
9
3
.
7
0
.
4
0
%
89
6
.
3
4
8
9
5
.
5
6
89
9
.
9
0
90
0
.
0
0
0
.
2
9
0
.
2
8
5
.
0
0
0
.
0
8
0
.
0
8
6
.
1
2
0
.
5
0
2
.
2
5
3
5
.
6
3
2
.
8
7
1
.
1
3
0
.
0
0
0
0
.
0
3
9
0
.
0
3
8
0
.
0
7
7
8
9
6
.
3
8
8
9
6
.
3
0
3
.
5
2
2
.
2
2
0
.
3
0
3
0
.
0
0
%
CB
-
5
CB
-
4
12
1
0
2
.
5
0
.
5
0
%
89
5
.
4
6
8
9
4
.
9
5
90
0
.
0
0
89
8
.
8
5
0
.
2
8
0
.
9
0
6
.
1
3
0
.
2
5
0
.
3
4
6
.
1
2
2
.
0
5
2
.
5
2
3
5
.
6
3
3
.
2
1
0
.
5
3
0
.
0
0
3
0
.
3
3
9
0
.
0
9
7
0
.
4
3
6
8
9
6
.
3
0
8
9
5
.
8
7
3
.
7
0
3
.
5
3
0
.
6
5
6
5
.
0
0
%
CB
-
4
CB
-
3
15
8
4
0
.
3
5
%
89
4
.
8
5
8
9
4
.
5
6
89
8
.
8
5
89
9
.
7
5
0
.
1
7
0
.
8
5
6
.
6
6
0
.
1
5
0
.
4
8
6
.
1
2
2
.
9
5
3
.
8
2
6
4
.
6
0
3
.
1
1
0
.
4
5
0
.
0
0
2
0
.
1
7
5
0
.
0
9
1
0
.
2
6
6
8
9
5
.
8
7
8
9
5
.
6
0
2
.
9
8
3
.
4
3
0
.
8
1
6
5
.
0
0
%
CB
-
3
CB
-
2
18
2
1
0
.
2
5
%
89
4
.
4
6
8
9
4
.
4
0
89
9
.
7
5
90
0
.
0
5
0
.
0
5
0
.
9
5
7
.
1
1
0
.
0
5
0
.
7
7
6
.
1
2
4
.
7
3
5
.
2
5
1
0
5
.
0
5
2
.
9
7
0
.
1
2
0
.
0
0
2
0
.
0
4
3
0
.
0
8
7
0
.
1
2
9
8
9
5
.
6
0
8
9
5
.
4
7
4
.
1
5
3
.
3
4
1
.
0
5
7
0
.
0
0
%
CB
-
2
CB
-
1
18
5
5
0
.
2
5
%
89
4
.
3
0
8
9
4
.
1
7
90
0
.
0
5
89
9
.
4
3
0
.
0
1
0
.
3
6
7
.
2
2
0
.
0
0
0
.
7
8
6
.
1
2
4
.
7
6
5
.
2
5
1
0
5
.
0
5
2
.
9
7
0
.
3
1
0
.
0
0
2
0
.
1
1
3
0
.
0
8
7
0
.
2
0
0
8
9
5
.
4
7
8
9
5
.
2
7
4
.
5
8
3
.
3
4
1
.
0
5
7
0
.
0
0
%
CB
-
1
C
B
2
.
2
1
8
4
6
0
.
2
5
%
89
4
.
0
7
89
3
.
9
5
8
9
9
.
4
3
n/
a
0
.
0
8
0
.
7
0
7
.
5
3
0
.
0
5
0
.
8
3
6
.
1
2
5
.
0
9
5
.
2
5
1
0
5
.
0
5
2
.
9
7
0
.
2
6
0
.
0
0
2
0
.
1
0
8
0
.
0
8
9
0
.
1
9
7
8
9
5
.
2
7
8
9
5
.
0
8
4
.
1
6
3
.
3
9
1
.
1
3
7
5
.
0
0
%
To
t
a
l
D
r
a
i
n
a
g
e
A
r
e
a
=
T
o
t
a
l
C
x
A
=
0
.
8
3
Ma
n
n
i
n
g
'
s
"
C
1
"
F
a
c
t
o
r
=
(
1
.
4
9
/
n
)
x
(
A
)
x
(
R
2/3
)
* Starting HGL calculation is set based on actual depth of flow.
1.6
5
W
e
i
g
h
t
e
d
S
i
t
e
"
C
"
=
0
.
5
0
Q
=
"
C
1
"
x
S
1/2
* HGL is max value of downstream HGL or actual flow elevation.* Check outlet storm sewer crown or Basin HWL for starting HGL
P:
\
7
0
0
5
0
0
1
2
\
W
I
P
D
R
A
W
I
N
G
S
\
C
i
v
i
l
\
C
a
l
c
s
\
C
B
A
C
a
r
m
e
l
-
M
a
s
t
e
r
S
t
o
r
m
.
x
l
s
m
/
S
t
o
r
m
S
e
w
e
r
1
0
-
Y
R
8/
2
/
2
0
1
9
Project: Christian Brothers Auto - Carmel, IN
Project # 70050012 Prepared By: JRS
Subject: Stormwater Detention Basin Sizing Reviewed By:
Date:
Revised:
Determination of Post-Development Peak Discharge from Site
10-year and 100-year Storm Events
Rational Method
Design Information:
Site Information:
Total Area of Proposed Development =1.23 Acres
Impervious Area =0.73 Acre
Pervious Area = 0.50
Impervious "C" Factor =0.90
Pervious "C" Factor =0.30
Weighted "C" Factor for Post-Development Area of Site =0.59
Storm Information:
Time of Concentration = 8.00 Min
10-Year Storm Intensity (5-min) = 6.12 in/hr
100-year Storm Intensity (5-min) = 9.12 in/hr
Peak Discharge Rates:
10-Year Peak Discharge = 4.47 cfs
100-Year Peak Discharge = 6.67 cfs
* These rates represent the discharge from the Christian Brothers site. Restricted release to allowable rates will be accomplised
from the detention basin on the Aria Development.
May 30, 2019
P:\70050012\WIP DRAWINGS\Civil\Calcs\CBA Carmel - Master Storm.xlsm/STORM DISCHARGE
8/2/2019