HomeMy WebLinkAboutDrainage Report
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Drainage Report
126TH STREET MEDICAL OFFICE PARK
Kite Development
Carmel, Indiana
August 2004
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TABLE OF CONTENTS
DRAINAGE SUMMARY & SITE MAPS ........................................-......................................... SECTION 1
D EV E LOP ED SITE D RAI NAG E PLAN .................................................................................. SECT ION 2
STORM SEWER CALCULATIONS....................................................................................... SECTION 3
Wool pert
August 2004 .
126th Street Medical Office Park
Kite Development
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DRAINAGE REPORT
Existing Conditions
The existing 23.64-acre site is located in the northwest quadrant of the intersection of West
Carmel Drive and Pennsylvania Street in the City of Cannel, Hamilton County, Indiana. At
present, the site is an open grassy meadow with a line of trees and bushes along the west side of
the property. There is one existing pond located on the south end of the site that has been
designated as existing wetlands. Soil types present onsite include Crosby silt loam and
Brookston silt loam. The site currently drains south into the existing pond and then continues
south through twin 21 " corrugated metal pipes.
The allowable release rate from the twin 21" CMP's into the existing manhole south of West
Carmel Drive is 5.0cfs. This release rate was set forth in the drainage study "Addendum to
Stormwater Management. Design Calculations on Hamilton Crossing" dated June 1, 1989
prepared by Paul I. Cripe and Associates. Release rate restrictions were placed on this site, the
Duke property to the south, the Meijer property'to the east, and Meridian Crossing to the west
across U.S. 31. This was due to historical accounts of Pennsylvania Street overtopping during
intense rainfall events.
According to the FEMA Flood Boundary and Floodway Map, Community Panel 180081 0007 C,
the site does not lie in a floodplain.
Proposed Conditions
The proposed improvements include a multi-story office building, parking areas, expansion of
the existing detention pond, storm and sanitary sewers, and other associated utilities. This
construction will take place on the middle portion of the overall site. Therefore, the proposed
detention will be for this portion of the development as well as the existing building on the north
side of the property. The release rate from the proposed pond will be held to 2.73cfs or less
which is 55%, 12.90 Acres, of the allowable 5.0cfs for the overall site. This corresponds to the
percent of the property that is being disturbed with this current development and the existing
north building.
The site will drain to the proposed detention pond, located on the west side of the property,
through a storm sewer network. Pond, A will outlet into a temporary channel that flows south to
the existing twin 21-inch pipes under Carmel Drive. A 7-inch orifice plate will be placed on the
outlet pipe from the pond to control the flow into the temporary channel to '2.23cfs. This is less
than the allowable 2.73cfs described above. In order to prevent flooding, due to the orifice being
clogged, an emergency overflow weir will be placed at the 100-year pond elevation of 867.95 ft.
A proposed watershed map for this site can be found in Section 2 of this report
The ponds were analyzed using the SCS Method' and the Advanced Interconnected Channel and
Pond Routing (AdICPR) program version 3.02. The pond is designed to regulate the 100-year,
Woo Ipe rt
August 2004
126th Street Medical Office Park
Kite Development
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24-hour rainfall event to 2.34cfs into the temporary channel that flows to the existing twin 21"
CMP'culverts at the south end of the site. This is O.30cfs less than the 2.73cfs restrictive release
rate described above.
Pond A
Normal Pool Acrea e
864.00 0.73
Release Rate (cfs)
2.34
Time of concentration calculations and runoff values for the overall basin can be found in
Section 2 of this report. The time of concentration was assumed to be 5 minutes for all storm
sewer calculations and the runoff value was taken as 0.85.
Conclusion
The development of this property includes a multi-story office building, parking areas, the
extension of all necessary utilities, and the reduction of the storm water outflow to help reduce
flooding of Pennsylvania Street. The proposed development of Carmel Medical Center has been
designed in . accordance with the Drainage Report for the Hamilton Crossing East development
dated November 1998. The post-developed release rate of 2.34cfs, for the north portion of the
site is less than 2.73cfs, the percent of the allowable release rate of 5.0cfs set forth in the drainage
study "Addendum to Stormwater Management Design Calculations on Hamilton Crossing" dated June 1,
1989 prepared by Paul I. Cripe and Associates. Therefore, no adverse impacts are anticipated from
this development.
Wool pert
August 2004
126th Street Medical Office Park
Kite Development
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HAMILTON COUNTY, INDIANA - SHEET NUMBER 50
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APPROXIMATE SCALE
400 0
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400 FEET
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Ii NATIONAL FLOOD INSURANCE PROGRAM
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~ ~~~ FLOODWAY
; ~~~ FLOOD BOUNDARY AND
i ~~.. FLOODWAY MAP
f ~ CITY OF
r ~ CARMEL,
INDIANA
HAMILTON COUNTY
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PANEL 7 OF 14
(SEE MAP INDEX FOR PANELS NOT PRINTED)
COMMUNITY.PA'NEL ,NUMBER
180081 0007,C
EFFECTIVEDA TE:
MAY 19, 1981
federal emergency management agency
federal insurance administration'
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PHASE I&II Hydrology Sim: PHASE I&II
G:\SD\Projects\61946\Engineering\Detention\PHASEI&II\PHASEI&II
Name
Filename
Patch: No
Delta Z Factor: 0.01000
End Time (hrs) : 30.00
Max Calc Time (sec) : 60.0000
Boundary Flows
No
Restart
Max Delta Z(ft): 1.00
Time Step Optimizer: 0.000
Start Time (hrs) : 0.000
MiIi Calc Time (sec) : 0.5000
Boundary Stages:
CARMEL MEDICAL - PHASE I
Time (hrs) print Inc(min)
------ -----
30.000 1.000
Yes
No
Execute
Alternative
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