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' A This Drainage Report is consciously provided as a PDF.
Please consider the environment before printing this document in its entirety.
When a hard copy is absolutely necessary, we recommend double -sided printing.
—Northern Encineerino.cons // 970.221.4158
City of Ft. Collirw0pprgived Plans
Approved By 2
Date
Prepared for:
CSURF
P.O. Box 483
Fort Collins, CO 80522
Prepared by:
NORTHERN
ivl� ENGINEERING
200 South College Avenue, Suite 10
Fen Collins, Colorado 80524
Phone: 970.221.4158 Fax: 970.221,4159
Project Number: 232-023
NORTHERN
ENGINEERING
ADDRESS: PHONE:970.221.4158 TE:
200 S. College Ave. Suite 10 WEBSIWEBSI rthernengineering.com
Fort Collins, CO80524 FAX:970.221.4159
' Drainage Letter Report
Date: January.29, 20.14
' Project: Centre for Advanced Technology, 23" Filing Project No. 232-023
Sunshine House — FC 139
Fort Collins, Colorado
Attn: Mr. Wes Lamarque
' City of Fort Collins Stormwater Utility
700 Wood Street
Fort Collins, Colorado 80521
' Dear Wes:
This letter serves to address the stormwater impacts of the above referenced project. The project is
' located within Tract A of The Grove at Fort Collins. Tract A is currently comprised of undeveloped
grassland owned by CSURF. However, Tract A was planned as a future development in accordance with
the CDP of record (E zoning district). While the development of this parcel was not a part of The Grove at
' Fort Collins student housing development, certain assumptions were made in the drainage computations
contained within the project. A 90% impervious value was assumed for Tract A, delineated as Basin X
within the Final Drainage Report for The Grove at Fort Collins. This basin drains north towards the
' intersection of Perennial Lane and Botanical Lane. A flared -end -section was constructed to convey flows
through a storm sewer under Perennial Lane into the Grove's water quality pond. Both the storm sewer
and water quality pond were sized to accommodate the fully developed future flows from Basin X. (See
' Appendix C for documentation of Hydrology, Hydraulic and Water Quality calculations performed for The
Grove at Fort Collins.)
' Sunshine House — FC 139 is proposing to subdivide Tract A into two lots. The proposed improvements are
planned to occur within the northern half of the original Tract A (proposed Lot 1). The southern half of
Tract A of The Grove at Fort Collins will be replatted as Lot 2 of Sunshine House — FC 139, and will
' remain undeveloped. Due to the governing CDP of record, Lot 2 will be reserved for future development
carrying forward the same assumptions used with The Grove at Fort Collins.
' The off -site basins within Lot 2 of Sunshine House — FC 139 have been divided into four separate basins
to better define the drainage calculations. Currently, Tract A drains from the southeast to the northwest
except for a small portion draining off -site to the west (Basin OS4). Until the southern portion is developed,
the current drainage patterns have been accounted for within the improvements proposed for the Sunshine
House — FC 139. Upon full build -out of Lot 2, the drainage patterns within Basins OS 1-3 will need to be
rerouted to discharge at the northwest corner of the site into proposed Basin Al.
' Four major basins were delineated for Lot 1 (Basins A-D), each corresponding to an associated storm line
in which the basin is routed, except for Basin D. The basins were further divided to allow for calculations
at each drainage structure or conveyance element.
Drainage Letter Report Page 1 of 3
-� Centre for Advanced
Technology,
' ■� NORTHERN 23th Filing
ENGINEERING House— FC 139
' Basin A is composed of the western portion of Lot 1 and conveys stormwater via overland, swale, gutter
and pipe flow. Storm Line A was sized to allow for all of the drainage from Lot 2 (Basins OS1-OS2) to be
routed through the site upon full build -out at 90 percent imperviousness. The basin was further divided to
account for each conveyance element and calculations are shown in Appendices A and B.
' Basin B is composed of the eastern portion of Lot 1 and conveys stormwater via overland, swale, gutter
and pipe flow. Storm Line B was sized to allow the existing portion of,.Lot 2 (Basin OS3) to be routed
' through the site in current conditions. Upon full build -out of Lot 2, all drainage patterns within Basin OS3
will need to be rerouted to discharge into Basin Al. Basin B was further divided to account for each
conveyance element and calculations are shown in Appendices A and B.
' Basin C is composed of a small_ portion of the roof and conveys water via overland and..pipe flow. Storm
line C was sized to drain this roof area through the two associated roof leaders.
' Basin D consists of the landscape area on the north side of the proposed building and a portion of the
proposed building on the east side. All other proposed basins drain into this area and stormwater is
conveyed via overland and swale flow. All of the drainage from the site and Basin D is discharged into an
' existing storm sewer line located within the northwestern corner of the project. This storm sewer (Storm
Line 4) was designed to convey all stormwater from Lot 2 as well, and discharges directly into an existing
water quality pond.
The existing water quality pond is located west of the intersection of Perennial Lane and Botanical Lane.
This water quality facility was designed with The Grove at Fort Collins to adequately handle the stormwater
' from all 3.84 acres of Tract A assuming an overall imperviousness of 90 percent. Assuming the remaining
1.89 acres of Tract A to be 90 percent impervious, the overall imperviousness of both Lot 1 and Lot 2 of
Sunshine House — FC 139 is only 57 percent, which is well below the 90 percent allocated for the entire
' basin.
Although stormwater quantity detention is accounted for regionally, stormwater quality mitigation will be
' addressed by both temporary and permanent Best Management Practices (BMPs). During construction,
the Contractor will follow the appropriate and applicable City of Fort Collins standards for erosion and
sediment control. A comprehensive Stormwater Management Plan has been prepared for this project, and
' a copy has been supplied to the Environmental Regulatory Specialist with Fort Collins Utilities. Post
construction water quality and erosion control will be achieved by a fully established and stabilized site.
All areas disturbed during construction will receive permanent hardscape, landscape, or building structure.
' A small portion of the project site at the northwest corner of the property is located in the Spring Creek
FEMA regulatory 100-year flood fridge. This flood mapping (Map Number 08069C0987G) was revised
May 2, 2012 prior to the construction of Perennial Lane. Since a small portion of the development falls
within a 100-year high risk flood fringe, a Floodplain Use Permit (FUP) shall be obtained prior to
commencing with any construction within this area. The only proposed improvements within the 100-year
' high risk flood fringe consist of site work (sidewalk, grading landscaping, etc.). As such, this project seeks
to obtain a FLIP with the initial Development Construction Permit (DCP), which would then cover all work
to take place within the floodplain. Through the use of the current effective floodplain model obtained
from the City Stormwater Staff, an approximate 500-year flood elevation was calculated. The lowest floor
elevation of the proposed critical facility has been set over 5 feet above this anticipated 500-year Base
Flood Elevation (BFE). Nonetheless, an official 500-year floodplain is yet to be established and the risk
' potential is acknowledged. However, the Applicant feels that the risk is minimal. The elevated site and
roadways are expected to remain above 500-year floodplain mapping, and 100-year dry land access is
provided.
1
Drainage Letter Report Page 2 of 3
'
NORTHERN
Centre for Advanced Technology, 23th Filing
ENGINEERING
Sunshine House — FC 139
1
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Stormwater quantity detention was addressed with The Grove at Fort Collins, and proved that all of Tract A
could develop at 90 percent imperviousness without the need for on -site attenuation. Water quality
treatment for the entire Grove subdivision limits occurs within the existing extended detention basin. While
the existing pond provides the necessary baseline water quality capture volume for Sunshine House — FC
139, it does not address the recent Low -Impact Development (LID) regulations enacted with Ordinance
No. 152, 2012. Therefore, a permeable paver system has been designed with this project and
encompasses over 25 percent„of the proposed parking area. This LID component also treats roughly 50 of
the new impervious surfaces, including the entire parking lot itself, which is the primary area of concern
from a pollutant source standpoint.
In analyzing Lot 1 and Lot 2 of Sunshine House — FC 139, the entire area was master planned to have an
imperviousness of,90-percent, whereas the current proposal results in an imperviousness of only 57 _-_-
percent. All drainage structures and facilities, including regional water quality, were designed and
constructed to adequately handle the full build -out of both Lot 1 and Lot 2. Lot 1 is currently being
designed to allow for drainage from Lot 2 at full build -out to be routed through the project site. The
proposed development complies with applicable drainage master plans governing the site, primarily that of
Spring Creek, Centre for Advanced Technology, and The Grove at Fort Collins. Standard Operating
Procedures (SOPS) for the LID facilities will be incorporated into the Development Agreement.
Furthermore, the project is designed in accordance to the governing floodplain regulations contained within
Chapter 10 of the City Code, and the Floodplain Use Permit shall ensure that construction remains
compliant with Chapter 10. Therefore, it is my professional opinion that the proposed improvements to
Lot 1 satisfy all applicable stormwater criteria.
Please do not hesitate to contact me if you have questions or require additional information.
APPENDICES:
APPENDIX A
APPENDIX B
APPENDIX C
/9�
Cody N. Snowdon
Project Engineer
— Rational Method Developed Runoff Calculations
— Hydraulic Calculations
— Supporting Documents
Draina¢e Letter Report Page 3 of 3
NorthernEnnineerina.com // 970.221.4159
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2J412014 Northern Engineering Services, Inc. 232-023 Riprap Calcs Spreadsheet.xls
By: CNS Main Street Health and Rehab 232-023_Riprap Calcs Spreadsheet.xls
Project No. 837-001
DRAINAGE CRITERIA MANUAL (V. 1)
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Rev. 0412008
Urban Drelnepa and Fboe Cnrd" Dlsindy
MD-107
Page 2 of 4
2/4/2014 Northern Engineering Services, Inc. 232-023_Riprap Calcs Spreadsheetxls
By: CNS Main Street Health and Rehab 232-023_Riprap Calcs Spreadsheetxls
Project No. 837-001
DRAINAGE CRITERIA MANUAL (V. 1) MAJOR DRAINAGE
B = Expansion Angle
7
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Flpure MO-23—Expansion Factor for Circular Condufts
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Project Number
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Client
Campus Crest
Pond Designation
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Project Tittle
The Grave at Fort Callins
Date: January 6, 2012
Project Number
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Cal. By: A. Reese
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Campus Crest
'
Pond Designation
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X( WSHNOTES: ;J zW / / 1 ME 9S THE AND LOCATION OF ALL KNOW UNDERGROUND `
UMUMES ARE APOAMATE MEN SHORAN ON THESE DRAWNGS.
/ i SMALL BE ME RESPONSIBILITY OF ME CONTRACTOR TO
WRITE THE EXISTENCE OF ALL UNDERGROUND UnunEs IN ME a
/ LwES AREA OF THE PARK. BEFORE COMMENCING NEW CONSTRUCTION A . +
E CONTRACTION SMALL BE RESPONSIBLE FOR LOCATING ALL d�
UNDERGROUND UNRES AND STALL BE RESPONSIBLE FOR ALL
ALL UNKNOW UNDERGROUND UAUTEB.
/ 3. REFER iO ME 'EIHAL ORxHAGE LETTER FOR THE SUNSHINE
/ 35. 2014 FOR SADOTCNAL INFORMA9 BY NORTHERN TIO`M.ERING. DATED JANUARY
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BENCHMARK �E
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UNITS OF MOI FLOOD "M
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CORNING RUCCOWAY
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REVISED DAIS MAY 2 2012
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MATCH GEODETIC SURVEY: REM) 713-3242
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