HomeMy WebLinkAboutTIMBERLINE FARM PUD, PARCEL A - PRELIMINARY - 42-89A - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT• 0
PRELIMINARY DRAINAGE REPORT
FOR
TIMBERLINE FARM P.U.D. - PHASE A
Project No. 248.8
July 1989
Prepared For:
The Group, Inc.
401 West Mulberry Street
Fort Collins, CO 80521
Prepared By:
Engineering Professionals, Inc.
2000 Vermont Drive
Fort Collins, CO 80525
TABLE OF CONTENTS
1.0 Location .............................................. 1
2.0 Existing Conditions ....................................... 1
3.0 Proposed Drainage ....................................... 1
4.0 Conclusion ............................................ 3
APPENDIX
Calculations
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PRELIMINARY DRAINAGE REPORT
FOR
TIMBERLINE FARM P.U.D. - PHASE A
' 1.0 Location
Timberline Farm consists of the west half of the southwest quarter of Section 32, T7N,
R68W. Phase A embodies 20.2 acres located in the northeast portion of Timberline Farm. The
site is bounded by undeveloped land on the west and south, Caribou Road on the north and
Harmony Village Mobile Home Court on the east. The property is located within reach 2 of
the Fox Meadows Drainage Basin.
2.0 Existing Conditions
The site has historically been used for agricultural purposes. Presently a portion of the
tract is being farmed with the remainder uncultivated. The property is a portion of a larger
basin which drains to the north. The site has slopes of 1 % to 3% with the north portion being
the steepest. Offsite drainage onto the site consists of sheet flow from the undeveloped area
to the south.
A swale has been constructed from the northeast corner of the Phase A to the east
along the south side of Sunstone Village Filing No. 1 which directs flows to the Harmony
Village Mobile Home Court detention pond. This swale was specifically constructed to handle
existing 2 year event runoff from Timberline Farm and will be utilized as a discharge point for
a portion of the developed site runoff.
3.0 Proposed Drainage
The proposed drainage of the site is in accordance with the Master Drainage Report for
Timberline Farm prepared by Engineering Professionals, Inc., dated August 1989. The site will
be divided into 3 basins, denoted A, B, and C on the Preliminary Drainage Plan. Basin A
corresponds to basin 5 of the Master Plan while basins B and C consist of portions of basins
4 and 2, respectively, of the Master Drainage Plan.
1
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' Basin A
' Consisting of approximately 3.7 acres, basin A includes the area immediately south of
Caribou Drive which will drain directly onto this street. Runoff from this basin will be directed
to the Sunstone regional detention pond via Caribou Drive. Street capacities for both the 2
and 100 year storm have been calculated to be adequate with this additional flow (refer to
appendix).
Basin B
Basin B is located at the northwest corner of the site and includes 3.1 acres. This basin
will drain to the northwest and will be ultimately be released to the proposed 42" pipe along
the west side of the site and the Sunstone Village detention pond. As this outfall system has
yet to be completed, it is proposed to construct a retention pond in the northwest portion of
Parcel D to handle runoff until the system is constructed. Once the outfall is constructed the
detention pond would convert to a detention pond with the maximum release ratebeing 6 cfs
(dictated by the Master Drainage Report for Timberline Farm).
Basin C
Consisting of approximately 19 acres, basin C will drain to the northeast into detention
pond 1, preliminarily sized at 4.1 acre feet. Flows will be directed to the pond primarily by
street flow. Runoff released from the pond, at a maximum rate of 11 cfs, and will be directed
into the swale along the south end of Sunstone Filing No. 1 into the Harmony Village Mobile
Home Park detention pond and ultimately into the Sunstone regional detention pond per the
Master Drainage Plan.
The following tables identify drainage basin and runoff data for the proposed
development of the site:
DRAINAGE BASIN DATA
BASIN
AREA (acres)
C
02 (cfs)
Q100 (cfs)
A
3.7
0.50
3.9
14.0
B
3.1
0.50
3.6
12.5
C1
2.0
0.70
3.2
11.3
C2
2.9
0.60
3.6
12.8
C3
1.4
0.50
1.6
5.8
C4
1.3
0.50
1.5
5.4
C5
1.3
0.50
1.5
5.4
C6
2.4
0.50
2.8
9.9
C7
3.7
0.50
4.2
14.7
C8
4.0
0.25
1.5
5.1
4
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0
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DESIGN POINT
BASINS
Q2 (cfs)
Q100 (cfs)
1
C1
3.2
11.3
2
C2
16.9
12.8
3
C1-C4
8.4
30.2
4
C1-05
9.3
32.9
5
C3
1.6
5.8
6
C3, C6
4.0
14.4
7
C7
4.2
14.7
8
C8
1.5
5.1
9
A
3.9
14.0
10
B
3.6
12.5
4.0 Conclusion
This Timberline Farm Phase A preliminary drainage report was prepared in accordance
with the City of Fort Collins Storm Drainage Criteria and the applicable drainage master plans
for the area. Storm water runoff for the 2 and 100 year storms are routed safely through the
site.
Respectfully Submitted,
ENGINEERING PROFESSIONALS, INC.
Steven L. Kraushaar. P.E.
3
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APPENDIX
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