HomeMy WebLinkAboutTHE MARKET PLACE PUD - PRELIMINARY - 21-89 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT (2)�1 •
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PRELIMINARY DRAINAGE REPORT
FOR
A PROPOSED SHOPPING CENTER
LOCATED AT
SOUTH COLLEGE AVENUE & TROUTMAN PARKWAY
FORT COLLINS, COLORADO
TO BE DEVELOPED BY:
ROSENBAUM/DEAN
COLORADO SPRINGS, COLORADO
APRIL 3, 1989
PREPARED BY: PARSONS & ASSOCIATES
432 Link Lane Plaza
Fort Collins, CO 80524
(303) 221-2400
PROJECT NO. 89.07 ROS
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TABLE OF CONTENTS
COVER LETTER
INTRODUCTION
SITE DESCRIPTION
HISTORIC DRAINAGE
MASTER DRAINAGE
DRAINAGE UNDER DEVELOPED CONDITIONS
CONCLUSIONS AND RECOMMENDATIONS
VICINITY MAP
CALCULATIONS
ENCLOSURE:
PRELIMINARY GRADING AND DRAINAGE PLAN
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PARSONS &
ASSOCIATES
CONSULTING ENGINEERS
I
April 3, 1989
Mr. Steve Boyette
Rosenbaum/Dean
101 North Cascade Suite 400
Colorado Springs, CO 80903
RE: Proposed Shopping Center to be located at the Northeast
corner of South College Avenue & Troutman Parkway, Fort
Collins, Colorado
Dear Mr. Boyette:
' As you have requested, this firm has performed a preliminary
drainage study for the subject project. Enclosed you will find
the results of that study. The investigation was based upon: the
' proposed site plan, topographic surveys, previous investigations
performed for the surrounding development and on -site
observations.
' We sincerely appreciate the opportunity to be of service to
you. If you should have any questions or desire additional
information, please advise.
Respectfully submitted,
Prepared by: � �,�
' Dennis R. Messner, CO P.E. #12609
Reviewed and Approved by:
Donald M,'Parsons, CO P.E. #13131
• 432 Link Lane Plaza Ft. Collins, Colorado
80524 • [303] 221-2400
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PRELIMINARY DRAINAGE REPORT
FOR PROPOSED SHOPPING CENTER
AT SOUTH COLLEGE AVENUE & TROUTMAN PARKWAY
INTRODUCTION
This preliminary drainage investigation has been performed
for the purpose of providing planning and preliminary 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, Township 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. on the 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. The total
site contains approximately 16 acres. The first phase is to
contain approximately E 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.
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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 Landings P.U.D.". It was
recommended in this report that the area above the No. 2 Canal 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, as a 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.
Additional runoff that flows onto the site from the adjacent
properties is directed through detention facilities in the
Fountainhead P.U.D. onto the site. The investigation and plan
preparation for facilities that were installed with the
Fountainhead P.U.D. were performed by Parsons & Associates. The
release rate for flows from the detention facilities onto this
site is 7.6 cfs.
DRAINAGE UNDER DEVELOPED CONDITIONS
The site is proposed to be a retail shopping center with
perimeter pads for food services and other high traffic uses. The
site is proposed to be developed in phases so that the southerly
500'+ of the site will be the initial development. The site has
been considered to divide flow into two separate points of
concentration based on the work performed under the Heart S.I.D.
The most westerly area is Basin A and is considered to have 9.96
acres concentrating at the 18" diameter storm drain pipe located
on the south side of Troutman Parkway approximately 200 feet west
of JFK Parkway. Of the total 9.96 acres concentrating at this
point 6.81 acres is within Phase 1.
The easterly drainage area, Basin B, is adjacent to JFK
' Parkway and concentrates at an 18" storm drain pipe located on the
east side of JFK Parkway at a point approximately 200 feet north
of Troutman Parkway. An area of 6.14 acres concentrates at this
point along with the controlled release from the Fountainhead
' P.U.D. of 7.6 cfs. Phase I will contain approximately 1.55 acres
in Basin B.
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Based upon the criteria established in the Report for the
Heart S.I.D., the area should be allowed to release at a rate of
0.87 cfs/acre. Therefore the maximum flows released from this
' area at the concentration points for Basins A & B are 8.67 cfs and
(5.34 + 7.6) 12.94 cfs, respectively. Due to existing topographic
conditions, it is suggested that this release rate be reduced to
allow for flattened slopes of storm drainage piping and thereby
' diminish fill requirements. The suggested release rate for Basin
A is 6 cfs and 12 cfs for Basin B. The total detention volume
required for Basin A is 68,750 cubic feet with 44,350 cubic feet
' to be provided with the initial phase of development. The total
detention volume estimated for Basin B is 40,800 cubic feet with
6,400 cubic feet to be provided with Phase I.
CONCLUSIONS AND RECOMMENDATIONS
' 1.) The site is to be developed to retain the general drainage
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
rates that meet or exceed established criteria.
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4.) The site is not located within an established floodway or
floodplain.
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HARMONY ROAD
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