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Drainage Report
Eastside Neighborhood Park
May 4, 1995
Prepared for:
City of Fort Collins Parks Department
Prepared by:
EDAW InL.
240 East Mountain Avenue �
Fort Collins, CO 80524
484-6073
Job No. 4F232
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Drainage Report
Eastside Neighborhood Park
May 4, 1995
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Prepared for:
City of Fort Collins Parks Department
Prepared by:
EDAW Inc.
240 East Mountain Avenue
Fort Collins, CO 80524
484-6073
Job No. 4F232
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TABLE OF CONTENTS
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INTRODUCTION .....................................
HISTORIC OFF-SITE DRAINAGE . . . . . . . . . . . . . . . . . . . . . . . . . .
PROPOSED OFF-SITE DRAINAGE . . . . . . . . . . . . . . . . . . . . . . . . .
HISTORIC ON-SITE DRAINAGE . . . . . . . . . . . . . . . . . . . . . . . . . . .
PROPOSED ON-SITE DRAINAGE . . . . . . . . . . . . . . . . . . . . . . . . . .
DRAINAGE DESTGN CRITERIA . . . . . . . . . . . . . . . . . . . . . . . . . . .
DETENTIONSTORAGE ................................
CONTROLLED RELEASE ...............................
DOWNSTREAM PONDING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONCLUSION ......................................
APPENDTX - DRAINAGE CALCULATIONS
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Introduction
' This report is submitted as a final design analysis of the historic and developed conditions for
the proposed Eastside Neighborhood Park, Fort Collins, Colorado. The site consists of
- 2.4 acres of undeveloped land, which drains to a curb inlet at the northeast corner of the site.
To the southwest is Laurel Elementary School, to the southeast is the Poudre Valley Hospital
(PVH) parking lot, to the east is the Riverside Shopping Center, and to the north is the AT&T
property and a storage yard. In addition to development on this site, modifications are
� proposed to the existing adjacent detention ponds at the Laurel School and the PVH parking
lot.
� The project proposes to overdetain the 100-year historic runoff from the Eastside Park site and
� the PVH site. This provision will serve two purposes: discharge from the PVH parking pond
can be further restricted to lessen the impact of the Fastside Park discharge on the same reach
of storm drain. 'The oversized detention pond will also mitigate the loss of detention caused by
construction of a public restroom in the Laurel School Basin No. 3 Pond.
The Eastside Park detention pond would accept and detain excess flows of 36,924 c.f. due to
� loss of detention storage in Basin No. 3. The project also proposes to extend the PVH parking
lot detention pond onto the Eastside Park site. The increased detention volume of 850 c.f. will
permit a decreased release rate from the PVH pond from 1.22 cfs to 1.00 cfs into the storm
� drain upstream of the Eastside Park discharge point. The cumulative result will be minimal
additional impacts on the existing storm drain system and improved detention capabilities. It is
anticipated that future improvements to the storm drainage system will completely mitigate the
, problems associated with the cunent undersized system.
This analysis, based on the design criteria of the City of Fort Collins, provides storm drainage
� design for the proposed construction and accommodates development-related site grading on
two adjacent properties.
Historic Off-Site Drainage -- There is currently no off-site drainage.
Proposed Off-Site Drainage -- The proposed c(evelopment will accept 36,924 c.f. of the
flow currently draining into Laurel School Basin No. 3.
� Historic on-Site Drainage -- The site cunently drains to a curb inlet at the northeast
corner of the site. The existing 8" storm drain increases to 12" diameter as it extends to the
northwest corner of the Riverside Shopping Center, then increases to 18" as it turns to the east
' � to I.emay Avenue.
' Proposed on-Site Drainage -- Figure A. indicates the proposed flow directions and basin.
Although a paved walk will be constructed across the site, the turfing which will be installed
will cause no net increase in runoff.
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Under the proposed development plan, a detention pond will release runoff from both the
Eastside Park site and a portion of the runoff from Laurel Elementary Basin No. 3. Runoff
from the Laurel School basin will be transfened to the Eastside site because some loss of
detention will be caused by construction of a public restroom in the current detention area at
Laurel School.
The development also proposes to enlarge the existing PVH parking lot detention pond onto
the Eastside Park site. A small amount of Eastside Park flows will enter this basin, but the
chief result will be to increase detention and further restrict the current discharge. This will
lessen the demand on existing storm drains downstream of Eastside Park (which are currently
undersized) to better accept the combined discharges of the two sites.
This report will quantify flows for the following conditions:
1. Excess flows from the Laurel School Basin No. 3, which will be transfened to the
Eastside Park pond.
2.
3.
4.
5.
6.
Required detention for Eastside Park under normal 100-year developed conditions.
Detention capacity available when Eastside Park flows are overdetained.
Extreme condition for Eastside Park if inlet plugs.
Increased restriction on flows from the PVH parking lot detention pond with proposed
increased capacity.
Impact on downstream ponding at northwest corner of Riverside Shopping Center site.
Information on existing storm drain conditions is based on the S�orm Drainage Report for
Laurel El.emen�ary School by Stewart and Associates, April 17, 1992; the Storm Drainage and
Erosion Control Report for Additinr�al Parking for Riverside Juncrion P. U.D., by Stewart and
Associates, May 22, 1992; and the Site Plan and Drainage Plan for Riverside Shopping
Center, prepared by Columbine Engineering Management Group, Inc. and approved by the
City of Fort Collins on June 22, 1984.
' Drainage Criteria -- As required by the City of Fort Collins Storm Drainage Design
Criteria, hydrologic information was developed for an initial storm return period of 2 years
and for a major storm event of 100 years. The criteria for determining the storm peaks and
. volumes were based on the Rational Method as outlir�ed in the above document. The design
� rainfall data used in this study was taken from the rainfall intensity-duration curve supplied by
the City of Fort Collins.
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DRAINAGE PLAN
Job. No. 4F232
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NEW AREA IN�ET
RIM= 63.5
EXIST. OFFSITE FLOWS
CINCRETE CURB
. � TOP OF CURB— 66.0
BAS1N N0. 3
EXIST. VOL.= 50,240 C.F.
PRDPOSED VOL� 32,698 C.F.
HWL= 65.5
BERN HT.= 65.7
OiHER EXIST. CONDITIONS REMFJN
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O�ERFLOW AT 62.50 —
. Q �m =3.42 CFS
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DRAINAGE TABLE
GROSS SITE AREA= 2.44 AC.
EXISTING C= 0.20
PROPOSED C= 0.20
HISTORIC RELEASE= 0.71 CFS
PROPOSED RELEASE= 0.71 CFS
REQUIRED DETENTION - NONE
DETENTION PROVIDED= 26,134 C.F.
SITE IS LOCATED IN OLD TOWN BASIN
,_�
EASTSIDE
_� er
e BZ \
e
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EN110N POND 61�
IOL= 25,26t C.f. �
H1M_= 62.7
BERM HT= 639 � �
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' �� � PVH PAfZK G LOT DETEPl11flN POND � _�
- � - . � E%1ST.'VOLe 16,365 C.F. �
� � � � PRUPOSED VOL= 17.248 C.f.� � �
HWI�� 64.5 (PER'�EX1ST . - ���-
� � REOUCED ORIFlGE PLA��}.�' �DIA. �
w a— i.00 cFs
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MAXINUM OVERFLOW ANTICIPAlED
(IF OUTLET PLUGS)
1.6 CFS TO
RIVERSIDE SHOPPING CENTER INLET
AREH DRAIN TO
EXIS". WLET
RIN=� �0.00
� ORIFI:E PLATE= 3.5' DIA
� q= a.7� CFS
�. Q,�.=0.64 CFS
Q�� 2.31 CFS
OVEI)FLOW CURB
Landscape Architecture
Planning
Urban Design
Environmental Analysis
Site Engineering
Graphic Design
EDAiP, Inc.
240 East Nountain Avenue
Fort Collins, CO 80525
303 484-8073
FAX 303 484-8518
511 l8th Street, Suite 510
Denver, CO 80202
303 595-4522
FAX 303 595-4434
•
.
.
�
�y of Fort Collins,
Colorado
Na. Dete Revidons
ero�ect Na.: 4F232.01
Deaigned by JM
rn�n� by JB
Checked by:
l➢ �wlo� �od �Au�m m�tml�1 �ppserloj Le�rmn
oon.tltale aaid�t ene mapaell�hsd �ork d ID1� md mq
ml W dupllwMd. v�d W �6OIaMd oltEad wAit�n oonlmL
O 4o BO
� I 11
��e
�p 61���
DRAIN�GE PLAN
��t No.