HomeMy WebLinkAboutHARMONY RIDGE PUD, PHASE ONE - FINAL - 49-95B - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTFIGURE 1
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1.0
Introduction
1.1 Scope and Purpose
This report presents the results of a final drainage evaluation for the Harmony Ridge P.U.D. A
hydrologic analysis of the proposed development plan was completed to determine the location
and magnitude of the storm runoff. The hydrologic data was then used to evaluate conveyance
and detention facilities based on City criteria.
1.2 Proiect Location and Description
The Harmony Ridge P.U.D. is a proposed combination townhome residential and single family
residential site. This site is located in the East half of the Northwest Quarter of Section 3, T6N,
R69W of the 6th Principal Meridian, Larimer County, Colorado. The site is bounded on the north
by the future alignment of Harmony Road, on the east by The Ridge P.U.D., on the south by the
Cathy Fromme Prairie, and on the west by unplatted vacant land. A vicinity map illustrating the
project location is provided in Figure 1.
The Harmony Ridge P.U.D. consists of approximately 31.4 acres. Approximately 22.3 acres is
proposed for townhome units and the remaining 9.1 acres is proposed for low density single
family lots. The development will consist of 22 building pads for townhomes with garages and 15
single family lots. The townhomes will be two story buildings with walkout basements. Seneca
Street, Shadow Ridge Drive, Dusty Sage Drive, and Shadow Ridge Court are the only public
streets in the development. All of the remaining streets within the townhome tracts will be private
and will be maintained privately.
1.3 Previous Studies
The "Preliminary Drainage Report for the Harmony Ridge P.U.D." (Stewart & Associates, Inc.,
September 18, 1995) was reviewed prior to the preparation of this report. Portions of the "Final
Drainage Report for the Arapaho Farms Townhomes P.U.D." (RBD Inc., 1994) and the
McClellands-Mail Creek Master Plan were reviewed for information pertinent to this
development.
TABLE OF CONTENTS
1.0 Introduction
Page
1.1 Scope and Purpose..........................................................................................................1
1.2 Project Location and Description.....................................................................................1
1.3 Previous Studies..............................................................................................................1
2.0 Historic Conditions....................................................................................................................3
3.0 Developed Conditions Plan........................................................................................................4
3.1 Design Criteria................................................................................................................4
3.2 Drainage Plan Development............................................................................................
5
3.2.1 Street Capacity .................................................................................................
10
3.2.2 Storm Sewer Design.........................................................................................
10
3.2.3 Inlet Analysis...................................................................................................14
3.2.4 Channel, Spillway, and Riprap Design..............................................................14
3.2.5 Detention Pond Analysis...................................................................................17
3.3 Erosion Control.............................................................................................................
17
Fi ures
Figure1 - Vicinity Map..........................................................................................................................2
Tables
Table 1 - Hydrologic Calculations Worksheet......................................................................................7&8
Table 2 - Summary of Attenuated Runoff.................................................................................................9
Table 3 - Summary of Street Capacity Analysis......................................................................................11
Table 4 - Summary of Storm Sewer Design............................................................................................13
Table 5 - Summary of Inlet Analysis and Design....................................................................................15
Table6 - Summary of Riprap Design.....................................................................................................16
Table 7 - Summary of Detention Pond Analysis and Design....................................................................17
Technical ADDendices
Appendix A - Rational Method Analysis
Appendix B - Street Capacity Analysis
Appendix C - Storm Sewer Design
Appendix D - Inlet Analysis and Design
Appendix E - Channel, Spillway, and Riprap Design
Appendix F - Detention Pond Analysis
Appendix G - Erosion Control Calculations
Sheets
Drainage & Erosion Control Plans
July 14, 1997
Mr. Glen Schlueter
City of Fort Collins Stormwater Department
P.O. Box 580
Fort Collins, CO 80522
RE. Harmony Ridge P. U.D.
Project No. 10-875-000
Dear Mr. Schlueter:
We are pleased to submit this Final Drainage Report for the Harmony Ridge P.U.D. The
report includes our evaluation of the proposed storm runoff interception and conveyance
facilities, detention analysis, and erosion control plan. It should be noted that the
preliminary report was prepared and submitted to the City by Stewart & Associates, Inc.
(September 18, 1995).
We believe this report meets the requirements for a final submittal and we look forward to
your review and comment. If you should have any questions please feel free to contact us.
Sincerely,
TST, INC. CONSULTING ENGINEERS
Donald N Taranto, P.E.
SAS/DBL/jts
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David B. Lindsay
TSTINC.
748 Whalers Way— Building D
102 Inverness Terrace East
Consuiring Engineers
Fort Collins. CO 80525
(970) 226-0557
Suite 105
Englewood, CO 80112
Metro Denver (303) 595-9103
(303) 792-0557
Fax (970) 226-0204
Fax (303) 792-9489
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FINAL DRAINAGE REPORT
FOR
HARMONY RIDGE P.U.D.
Submitted to:
CITY OF FORT COLLINS
July 14, 1997