HomeMy WebLinkAboutPINNACLE TOWNHOMES - PDP - 34-00A - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTFinal Drainage and Erosion Control Report
Pinnacle Townhomes; Ft. Collins, Colorado
B. Description of Property
5. There is an existing public bike path located on the southern portion of the
project site near Spring Creek.
III. DRAINAGE BASINS AND SUB -BASINS
A. Major Basin Description
1. This site is located in the Spring Creek Basin as delineated on the City of
Fort Collins Stormwater Basin Map. All runoff from the site will be
conveyed to Spring Creek,
2. This portion of the Spring Creek Basin is primarily developed with single
family and multi -family developments.
3. A portion of the site is located within the Spring Creek floodplain as
delineated on Sheet 4 of 25 of the "Spring Creek Flood Insurance Study"
prepared by Greenhorne & O'Mara.
a. This sheet is included in the stuffier envelope for immediate reference.
4. Amendments to the Spring Creek 100-year water surface elevations were
established by Northern Engineering Services, Inc. in a report titled
"F000dplain Modeling Report for Pinnacle P.D.P.' ; report dated May 7,
2001.
a. The floodplain modeling report considered higher rainfall standards
recently adopted by the City of Fort Collins.
b. Spring Creek 100-year floodplain elevations were slightly modified
based on the amended rainfall.
5. The Spring Creek floodplain and floodway are represented on the Flood
Insurance Rate Map (FIRM) panel 0801020012C; dated March 18, 1996.
B. Sub -Basin Description
The site generally slopes from north to south towards Spring Creek. Relief
across the site ranges from five feet (5') to fifteen feet (15').
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Final Drainage and Erosion Control Report
Pinnacle Townhomes; Ft. Collins, Colorado
I. INTRODUCTION:
This report presents the pertinent data, methods, assumptions, references and
calculations used in analyzing and preparing the final drainage, erosion control
and water quality design for the Pinnacle Townhomes site.
H. GENERAL LOCATION AND DESCRIPTION
A. Property location
1. Pinnacle Townhomes is located in the northwest one quarter (1/4) of Section
24, T7N, R68W of the 6th P.M., Larimer County (Ft. Collins), Colorado.
2. More specifically, the Pinnacle Townhomes site is located approximately
1,250 feet west of the intersection of East Prospect Street and Lemay
Avenue on the south side of East Prospect Street. The site is directly south
of the intersection of East Prospect Street and Robertson Street.
3. The site is bounded by East Prospect Street on the north, by Spring Creek on
the south, and by unplatted properties to the east and to the west.
4. The site includes two (2) parcels including the previously platted "Pinnacle
P.U.D." parcel. And the parcel to the west of the "Pinnacle P.U.D." parcel
identified as 813 Prospect Street.
a. The Pinnacle P.U.D. plat was recorded in 1986.
B. Description of Property
1. Pinnacle Townhomes is a proposed residential subdivision in Fort Collins,
Colorado. The overall subdivision consists of 50 Townhome units and three
(3) single family homes for a total of 53 units.
a. There is an existing single family home located in the extreme
northwest corner of the site (Lot 17). This single family home will
remain as part of this development.
2. Pinnacle Townhomes has a platted area of approximately 6.739 acres.
3. The site is currently vacant and is covered with native vegetation.
4. There are two (2) major trunk sanitary sewer mains located on the southern
portion of the project site. These mains are situated north of Spring Creek.
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TABLE OF CONTENTS
L INTRODUCTION
IL GENERAL LOCATION AND DESCRIPTION
A. Project Location
B. Description of the Project
III. DRAINAGE BASINS AND SUB -BASINS
A. Major Basin Description
B. Sub -Basin Description
C. Historic Conditions
D. Developed Conditions
IV. DRAINAGE DESIGN CRITERIA
A. Regulations
B. Development Criteria Reference and Constraints
C. Hydrologic Criteria
D. Hydraulic Criteria
V. DRAINAGE FACILITY DESIGN
A. General Concept
B. Specific Details — Street Capacities
C. Specific Details — Inlets and Storm Sewer
D. Specific Details - Swale Capacities
VI. FLOODPLAIN DESIGN AND PROTECTION
A. General Concept
B. Specific details
VII. WATER QUALITY
A. General Concept
B. Specific Details
VIII. EROSION CONTROL
A. General Concept
IX. VARIANCE FROM CITY STANDARDS
A. Variance from City of Fort Collins requirements
X. CONCLUSIONS
A. Compliance With Standards
B. Drainage Concept
XL REFERENCES
APPENDIX I
Drainage Calculations
APPENDIX H
Erosion Control
APPENDIX III
Charts and Figures
APPENDIX IV
Overall Master Drainage and Erosion Control Plan
Sheet 4 of 25 of the "Spring Creek Flood Insurance Study"
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HEAR
Final Drainage and Erosion Control Report
For
PINNACLE TOWNHOMES
9
Fort Collins, Colorado
Prepared for:
Pinnacle FTC, LLC
1083 Wild Cherry Lane
Ft. Collins, Colorado 80521
Prepared by:
SHEAR ENGINEERING CORPORATION
Project No: 1555-02-00
Date: June, 2001
f
S. College, Suite 12 Ft. Collins, CO 80525 (970) 226-5334 Fax (970) 282-0311 www.shearengineering.com