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DRAINAGE REPORT
LOADING DOCK ADDITION
TO EXISTING BUILDING ON
LOT 1, THE MARKET PLACE P.U.D.
4106 SOUTH COLLEGE AVENUE
FOR
GIULIANO & FATHER CONSTRUCTION. INC.
MARCH 15. 1993
STEWART & ASSOCIATES. INC.
103 SOUTH MELDRUM STREET
FORT COLLINS. COLORADO 80521
303/482-9331
Final Approved Report
Date 3 6
per- W' '
DRAINAGE REPORT
LOADING DOCK ADDITION
LOT 1, THE MARKET PLACE P.M.
EXISTING SITE:
The proposed loading dock is at the Northeast corner of the existing
building on Lot 1 of The Market Place P.U.D. The site is landscaped and
grassed. Runoff .is east to J.F.K. Parkway -then south to the existing curb
inlet at the driveway entrance to this building by the southeast building
corner. All runoff is to the No. 2 Canal. The original drainage report for
The Market Place P.U.D. which was prepared by Parsons and Associates is included
with this report.
DEVELOPED SITE:
The loading dock area is 0.04 acres. The construction of the loading
dock will change the existing site to an impervioussite requiring additional
storage volume. The existing detention pond (B-1 from the Parsons and
Associates report) as surveyed by us has the capacity to handle the additional
volume required.
The loading dock design will be to channel runoff to a low point on the
south side of the new driveway then route the water in a grass swale to the
existing pond.
EROSION CONTROL:
During construction, the contractor will be required to construct a
temporary gravel.filter around the existing outlet pipe from the pond and also
an area inlet gravel filter around the existing inlet at the south driveway
entrance from J.F.K. Parkway. Temporary barricades will be required around
the area inlet while the gravel filter is in place.
All design in this report is in accordance with the City of Fort Collins
Storm Drainage Design Criteria and Construction Standards manual.
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FINAL DRAINAGE REPORT
..FOR THE MARKET PLACE
FORT COLLINS, COLORADO
INTRODUCTION
This drainage. -.investigation has been 1. performed for the
purpose of providing design information for the development of a
proposed commercial shopping center to be located at the Northeast
corner 'of the intersection of South College Avenue. and Troutman
Parkway, Fort Collins, Colorado. The City of Fort Collins "Storm
Drainage Design Criteria and Construction Standards" was used as a
basis for guidelines and criteria throughout this investigation.
SITE DESCRIPTION
The study area is situated in the Southwest Quarter of
Section 36, Town_ship_7 North, Range
69 West of the 6th Principal
Meridian, City of Fort Collins, Larimer County, Colorado. The
site is bounded by: South College Avenue on the West; the
Fountainhead P.U.D. the
on North; the JFK Parkway on the East; and
Troutman Parkway on the South. A small
parcel of land located at
the Northwest corner of JFK Parkway and Troutman Parkway, known
as
Superblock Holding, is excluded from this development. This phase
of development
contains approximately 8 acres. The area.is
presently undeveloped and used for three residential
acreages with
the major portion of the property being vacant. The topography of
the site slopes from Northwest to Southeast at grades varying from
0.5% to 2%.
The site is predominantly covered with grasses and
native vegetation.
HISTORIC DRAINAGE
Prior to the construction of the streets bounding the site on
the east and south, the Larimer No._2 Canal formed the easterly
boundary of these lands. The No. 2 Canal was reconstructed and
relocated as a part of the Heart Special Improvement District.
Prior to this construction the area drained into the No. 2 Canal.
The -Heart Special Improvement District installed storm drainage
pipes onto the properties at the intersection of Troutman Parkway
and JFK Parkway.. The construction was performed in accordance
with an agreement between the City of Fort Collins and the Larimer
County Canal No. 2 Irrigation Company whereby the Ditch Company
allowed the City to;discharge stormwater into the No. 2 Canal.
MASTER DRAINAGE
The site has been considered in several previous: 'drainage
studies,in this area. The:"McClelland's Mail Creek" Basin is the
City's designated master plan basin in which this site is located.
The site has not been studied to any detail within this Basin
Master.Plan. An investigation for the area to the North and East
was prepared by Cornell Consulting Company. This report was the
"Master Storm Drainage Report For The Landinas P U D . It was
recommended in this report that the area above the No. 2Canal be
allowed to develop and -detain stormwater on -site and to release
run-off at the 2-year historic rate into the No. 2 canal. A
subsequent report prepared by Engineering Professionals, Inc. for
the Heart Special Improvement District recommends that in
conjunction with the reconstruction and relocation of the No. 2
Canal, asa part of the._.S.I.D., that the rate of discharge into
the canal be limited to 0.87 cfs/acre. The storm drainage pipes
that were installed to serve the properties were sized on that
basis. This site is a portion of Basin A (6.12 acres of 9.96) and
a portion of Basin B (1.85 acres of 6.14) as defined by the Heart
S.I.D. Flows from those portions of Basin A & B north of this
site have been calculated using 0.87 cfs per acre and passed
through the Market Place drainage system. (2.83 cfs for Basin A,
3.51 cfs for Basin B)
Additionally, 7.6 cfs from the Fountainhead P.U.D. will be
allowed through this site and discharged to the No. 2 canal.
DRAINAGE UNDER DEVELOPED CONDITIONS
This site is proposed to be. a retail. shopping center with
perimeter pads.for food service and other high traffic uses. The
majority of the site will be directed westerly to Basin A and
ultimately to the Troutman crossing, (7.405 ac.) and the remainder
of the site will be directed to the JFK Parkway Crossing. Flows
from Troutman Parkway and JFK Parkway will be released directly to
Canal No. 2, but detention has been provided on -site for those
adjacent portions.of Troutman & JFK. The release rate used was
0.87 cfs per acre per the -Heart S.I.D., and detention provided on -
site based on the difference between 100-year storm. and 0.87
cfs/acre release rate. 60,000 cubic feet of detention is required
for this site.
No detention has been provided for flows. from College Avenue.
However, these flows will overflow through the Market Place site
and ultimately drain to the Troutman crossing." Also, flows from
the 0.83 acres (Superblock Holding) were not; considered, although
pipe stub -outs have been provided and''capacity in the existing
i
system has been provided per the Heart S.I.D., allowing future
development of the site.
All easements for off -site drainage structures as shown on
I these plans are handled by separate document and not by the plat
of Market Place P.U.D.
CONCLUSIONS AND RECOMMENDATIONS
1.) The site is to be developed to retain the general drainage
I pattern existing prior to development.
2.) All final design and -construction shall conform with the City
of Fort Collins "Storm''Drainage. Design Criteria and
Construction Standards".
3.) On -site detention is to be provided with controlled release
I rates that meet established criteria per Heart Special
Improvement District Final Drainage Report.
I4.) The site is not located within an established floodway or
floodplain.
5.) The existing condition of the property to the north is such
�( that natural.ponding_is already in existence. Overflow of
that natural ponding occurs approximately at elevation 5031
per aerial topography of the site. Future development of
that property will require filling this low area to elevation
5031. The development of Market Place does not substantially
alter any drainage characteristics of the adjacent northerly
' property and does provide drainage facilities to accommodate
future development of that property.
Prepared under the direct supervision of:
O'0 Ye o'�s
Donald M. Par o13131 ns, P. E. # 13131 C�
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*So some detention of flows from -College Avenue will occur in all
situations except the 100-year storm, and even in the 100-year
event, the time of concentrations for College Avenue will be
increased.
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