HomeMy WebLinkAboutDrainage Reports - 01/20/2010Final Drainage Summary
for
Front Range Community C1W Ft. Collins
Sunlight Peak Buildiftproved By-&
Fort Collins, Colorad- �� `I
November 13, 200 pate
FROMITY OF AM
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Final Drainage Summary
for
Front Range Community C4)* Ft. Collins Approved Plans
Sunlight Peak Buildifproved. By
Fort Collins, Colora ate_ Ali -lb
November 13, 200
]PER-OP1 TY OF A' w a6k-r dro �e
FOR' i'Pt�:S arlal.�sis s �r,�d
-Per 4tal
SAC.
Prepared For:
Front Range Community College
4616 South Shields Street
Fort Collins; CO 80526
Prepared By:
NORTHERN
ENGINEERING
200 S. College Ave Fort Collins, Colorado 80521
Phone:(970) 221.4158 Fax: (970) 221-4159
Project Number: 413-002
1-
INORTHERN
ENGINEERING
Front Range Community College
' 4616 South Shields Street
Fort Collins, CO 80526
November 13, 2009
RE: Drainage Summary
' Sunlight Peak Building
Project No.: 413-002
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To Whom It May Concern:
ADDRESS: PHONE:970.221.4158 WEBSITE:
200 S. College Ave. Suite 100 WEBSIrthernengineering.com
Fort Collins, CO 80524 FAX: 970.221.4159
This drainage summary letter has been prepared by Northern Engineering Services, Inc.
(Northern) for the above referenced project to document the existing conditions and
proposed improvements for the new Sunlight Peak Building at Front Range Community
College Larimer Campus (FRCC) in Fort Collins, Colorado. Attached with this letter,
please find the Drainage Exhibit prepared for this drainage summary along with the
Grading and Erosion Control Plan and Details from the final construction plans for your
reference.
Site Location and Project Description
The site location for the proposed Sunlight Peak Building is on FRCC property located
southeast of the Harmony Road and Shields Street intersection. Specifically to the
campus, the proposed building will be located directly west of the existing Challenger
Point Building and north of the existing Blanca Peak Building. See the attached
Drainage Exhibit for more information.
The proposed project includes a new building with an approximate foot print of 15,800
square feet, a small observatory building with an approximate foot print of 200 square
feet, the relocation and repaving of an existing walkway/fire lane, and new sidewalks and
landscaping adjacent to the proposed buildings.
Existing Drainage Reports
Two previous drainage reports have been completed for the FRCC campus and are
mentioned below. The "Final Drainage Study and Erosion Control Report" as prepared
by Landmark Engineering, dated April 30, 1996 and the "Drainage Summary Letter for
the Reconfiguration of & Expansion of Parking Lots and Traffic Flow Improvements" as
prepared by JVA Consulting Engineers dated April 19, 2006.
At the date of this drainage summary letter a final/approved version of the Landmark
report as mentioned above was not provided to Northern. Unfortunately, Northern was
only able to obtain a preliminary version of this report from Landmark Engineering. Due
to the preliminary nature of the Landmark report provided to Northern any conclusions or
'
information obtained from the report have been listed in the following sections as
assumptions only since verification/confirmation can only be determined by performing a
'
master drainage analysis.
'
Pre -development Conditions
Drainage Patterns
The site adjacent to the proposed project generally drains from the west to the east
towards the existing Challenger Point building. A small portion of this flow drains
towards the south into an existing curb inlet and into an existing 24-inch storm sewer
located south of the proposed building and north of the existing Blanca Peak building.
The majority of the existing site drains into an existing swale west and north of the
existing Challenger Point building. The flows from this swale and the existing 24-inch
'
storm sewer ultimately converge east of the Challenger Point building and flow into the
existing regional detention and water quality located on the east side of the campus.
pond
'
The existing site also has a small area (approximately 0.07 acres) north of the existing
Challenger Point building that flows towards the north and onto Harmony Road. This
project will maintain this condition.
' Existing 24-inch storm sewer
This project is located directly north of an existing 24-inch storm sewer constructed with
the "Front Range Community College Larimer Campus" construction plans dated July 3,
'
1996. This project coincides with the Landmark Engineering report as discussed above.
From the preliminary version of the Landmark report obtained by Northern it appears that
this existing 24-inch storm sewer was sized to include, among other improvements, a
future 50,000 square foot building located north of the library. An excerpt from the
Landmark report has been attached with this letter.
'
Based upon the information obtained from the Landmark report, it has been assumed that
the existing 24-inch storm sewer does have the capacity for this project including
portions of the 15,800 square foot proposed building. No other capacity information
regarding this existing storm sewer was made available at the date of this letter and a
regional study to verify the capacity of this existing 24-inch storm sewer was not part
'
performed by Northern.
Regional Detention and Water Quality Pond
'
With the 1996 Landmark project a regional detention pond was constructed for the
northern portions of the campus including the area of the proposed site development.
The JVA project in 2006 increased the size of the regional pond to include the southern
'
parking lot expansion project as well as adding water quality to the regional pond for the
entire campus An excerpt from the JVA drainage summary letter has been attached with
this letter.
Based upon the information obtained from the JVA drainage summary letter and
Landmark report as mentioned above regarding the existing regional detention and water
' quality pond, no further detention or water quality is being provided with the Sunlight
Peak building project.
Developed Drainage
' Design Criteria
This drainage summary letter has been prepared in compliance with technical criteria set
forth in the City of Fort Collins Storm Drainage Design Criteria and Construction
Standards.
'
Drainage Patterns
The placement of the proposed building and adjacent site features results in alterations to
the existing site drainage patterns. Based upon the assumptions made regarding the
'
existing 24-inch storm sewer as discussed above, the western portion of the building and
the areas south and west of the proposed building are now routed via proposed swales
and storm sewers to the existing 24-inch storm sewer located south of the proposed
'
building. The remaining portion of the proposed building and the areas north and east of
the building continue to be routed towards the east and north to the existing drainage
channel north of the existing Challenger Peak building.
'
Storm Sewers
For the project three (3) separate storm sewers are being proposed. Storm Sewer A is
located north of the proposed building and carries flows from the proposed swale north of
'
the building to the existing drainage channel north of the existing Challenger Point
building. Storm Sewer B is located south of the proposed building and collects flows.
south of the building via area inlets and directs them to the existing 24-inch storm sewer
'
south of the proposed building. Storm Sewer C is located west of the proposed building
and carries flows from the proposed swale west of the building to the existing 24-inch
'
storm sewer south of the proposed building.
Due to the lack of hydraulic information available regarding the existing 24-inch storm
'
sewer, the hydraulic grade line at the proposed connection points for Storm Sewers B and
C have been assumed to be at the crown of the proposed storm sewers.
' Future Developments
In order to minimize disturbance to the west of the proposed building overlot grading has
been limited to that required for the proposed development. Due to this, a portion of the
area west of the building (Basin B1) will be routed to the proposed swale and proposed
Storm Sewer C located west of the building. Both the proposed swale and proposed
storm sewer have been sized using the current conditions of Basin B 1 and did not account
for future development within the drainage basin. Future developments should verify the
capacity of the swale and Storm Sewer B before they are used to convey developed storm
water runoff.
' Conclusions
Overall, the drainage system proposed within this drainage summary provides adequate
conveyance of the developed stormwater runoff from the Sunlight Peak building site to
' the existing detention and water quality pond located on the east side of the campus. It
should also be noted that with this summary and the corresponding design, every attempt
has been made to minimize any negative impacts on the downstream receiving waters.
The proposed drainage of the Sunlight Peak site also adheres to the hydrology of the
drainage report presented in the preliminary version of the "Final Drainage Study and
' Erosion Control Report" as prepared by Landmark Engineering and dated April 30, 1996.
Northern understands that any review provided by Front Range Community College
' and/or the City of Fort Collins is to assure general compliance with campus requirements
and standardized criteria contained in the City of Fort Collins Storm Drainage Desig_n
Criteria. If you should have any questions or comments regarding this drainage summary
' please feel free to contact our offices at your earliest convienance.
Sincerely,
' NORTHERN ENGINEERING SERVICES, INC.
' Kevin Brazelton, PE
Project Engineer
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Previous Drainage Study Information
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April 19, 2006
1
Mr. Basil Harridan, Utilities- Stormwater Engineer
1 City of Fort Collins — Engineering Development Review
281 N. College / 700 Wood Street
Fort Collins, CO 80521
1 RE: Drainage Summary Letter for
"Reconfiguration & Expansion Of Parking Lots And Traffic Flow Improvements"
1 State Project No. FR070518
Front Range Community College-Larimer Campus, Fort Collins CO
1 JVA Job No. 1352c
Dear Mr. Harridan: '
1 As requested by the City of Fort Collins Public Works, JVA Inc. has prepared this
drainage summary letter regarding the proposed improvements and the existing and
developed drainage conditions for the above referenced parking lot project at Front
1 Range Community College Latimer Campus (FRCC) in Fort Collins, Colorado. We have
attached the related storm and erosion control plan portions of the final construction plans
for the project for your information. We have also attached excerpts from the previous
1 drainage report by Landmark Engineering dated April 30, 1996. and runoff and structure
design calculations by JVA, Inc.
GENERAL LOCATION AND PROJECT DESCRIPTION
Front Range Community College proposes to pave two existing gravel/road base parking
lots and enlarge and consolidate the existing detention pond at the Latimer Campus
1 within the City of Fort Collins. The parking lots and the detention pond expansion are
bounded by Shields Street, Harmony Road and the existing Latimer Campus. The total
campus/library site is approximately 44.0 acres.
1 EXISTING DRAINAGE
The existing site slopes from west to east between two and seven percent. At the
1 northerly and northwesterly side of the campus, existing runoff travels to the east via an
existing swale and storm culverts along Harmony Road until it reaches an existing
detention pond. An existing outlet structure releases the runoff into the easterly
1 downstream end of a vegetated ditch that runs from west to east through the southern
portion of the site. Existing runoff rates and detention pond facility features were
calculated in the Landmark report to be 99.8 CFS for the peak inflow and 6.12 CFS for
1 the peak outflow (release rate for the 100-year event). The 100-year required volume for
the existing pond was 88,975 CF and the actual volume of the existing pond was
calculated to be 89,833 CF.
' During our site visits, it was noted that the 100-year outfall/top of structure elevation of
this existing concrete outlet structure is higher than the top of the existing berm that
forms the pond creating a hazardous condition. Furthermore, no water quality
1 enhancement orifice, well screen, or other features were noted, and there is no engineered
spillway present.
At the southerly side of the campus, there is an existing vegetated ditch that runs through
the site from west to east beside the existing parking areas. Runoff from the southerly
' B O U L D E R I FORT COLLINS I W I N T E R P A R K
1VA.Incorporated
1319 Spruce Street
Boulder, CO 80302
Ph: 303.444.1951
Fax: 303.444.1957
Toll Free: 877.444.1951
Web site:
www.jvajva.com
E-mail:
info®jvajva.com
Principals
David M. Houdeshell
Robert B. Hunnes
Thomas P. Skinner
Thomas S. Soell
Kevin A. Tone
Cindera L. Ward
Structural Engineering
Daniel E. Cooke
Mark C. Cormier
Kathy A. Gilhooly
Heidi M. Hall
Derek D. Henderson
Michael R. Hope
Craig M. Kobe
Michael J. McDonald
David M. Mier
Derek M. Pedersen
Thomas M. Smith
Sarah E. Watts
Charles B. Wilkerson
Civil Engineering
Jon C. Driggers
Charles R. Hager
Howard M. McHenry
Carolyn A. Sullivan
Melissa F. Tolve
Administration
Andrew P. Krizman
M
FRCC Larimer Campus — State Project No. FR070518
March 30, 2006
Page 2 of 3
portion of the site flows directly to this ditch or is conveyed via a storm drainage system
1 to the ditch at the east end of the site. There is an 8" diameter PVC outlet pipe at the
westerly, upstream end of the ditch. The beginning point of this pipe could not be found;
however, it is our understanding based on discussions with FRCC and City staff that this
pipe is an outfall line for a groundwater underdrain system somewhere to the west. It is
our understanding that direct rainfall runoff does not enter this 8" pipe. Further to the
' west and tributary to the ditch there are two right-of-way outfall pipes that release runoff
from Shields Street.
' All runoff from the southerly portion of the site and the Sheilds Street right-of-way tributary to
the vegetated ditch exits the site without detention or significant water quality enhancement.
This existing condition is potentially hazardous and detrimental to the environment and
' downstream waterways.
DEVELOPED (PROPOSED) DRAINAGE
' The proposed development consists of a minor expansion of Lot 1 and paving of gravel parking
Lots 2 and 5 as shown on the attached Figure 1 - Drainage Map and referenced JVA storm
system plans. Site construction will include demolition of an existing asphalt road, removal of
' wheel stops, demolition of storm sewer, minor regrading, realignment of the Shields Street
intersection, replacement of a Type R inlet with a double Type 13, surface inlet near the library,
public sidewalk reconstruction, and all associated utility infrastructure work. As shown on the
' drainage map, a future lot was discussed during the recent design process (Lot 7 at the south side
_ of the site); however, this lot will not be built as a part of this project nor in the foreseeable
future. To produce a more conservative design, the construction of Lot 7 was included in the
attached runoff calculations.
For drainage design of this project, an existing large 22.7-acre study area has been delineated by
JVA as shown on the drainage map. As discussed above, this area currently drains overland to
the existing vegetated ditch, or to an inlet/storm pipe system that conveys runoff directly to the
existing vegetated ditch. This ditch runs through the southerly portion of the site from west to
' east and then flows directly offsite without detention.
The motivation of our design is to improve the water quality of the runoff from the site and
' provide as much detention as possible for the 22.7-acre study area. To accomplish this, it is
necessary to reshape and redesign the existing pond with more volume and a new updated water
quality enhancement outlet structure, as is typically required by the City of Fort Collins. The
' proposed pond as shown on JVA's plans will now capture the previously undetained ninoff
from the southerly portion of the site by encompassing the east end of the existing vegetated
ditch. In addition, water quality enhancement will be provided to both the northerly and
southerly portions of the site where none existed before.
Another goal of the project is to protect the existing vegetated ditch. This ditch will not be
modified with this project. The plans require portions of the existing drainage ditch near the
' work areas to be protected by silt fence. Any use of this swale by wildlife will not be hindered,
as the existing parking lot extents will not be changed along the swale. In addition, FRCC will
be improving the drainage characteristics near the existing drainage swale. Silt- and trash -laden
storm runoff from the existing large unpaved lots (Lots 2 and 5, which currently drain directly to
the existing drainage swale and leave the site undetained) will be rerouted via curbs, inlets and
storm pipes to the new consolidated water quality enhancement/detention facility. Furthermore,
' no wetlands areas will be disturbed during this project. Proposed grading at the new water
quality enhancement/detention facility only requires the removal the berms at the sides of the
rAll, FRCC Larimer Campus — State Project No. FR070518
�,",J""' March 30, 2006
_I ` Page 3 of 3
' vegetated ditch leaving the vegetation intact. This allows the existing trees, shrubs and cattails in
the ditch to thrive and assist with the water quality enhancement.
For this project, the 22.7-acre southerly area has been analyzed in order to provide with water
quality features. As shown by the attached calculations, historic runoff patterns were analyzed
for this area, and it was found that the total historic runoff rates at 20% impervious before the
' existing campus was built were 13.2 CFS and 26.9 CFS for the 10-year and 100-year storm
events, respectively. Developed runoff patterns were analyzed for this area, and it was found
that the total developed runoff rates at 72% impervious will be 56.9 CFS and 116.3 CFS for the
for the 10-year and 100-year storm events, respectively. Utilizing these results, a required water
quality capture volume (WQCV) of 26,342 CF was calculated for this area. The proposed outlet
structure is based on outlet details provided by the City staff and includes a water quality plate
and well screen. The release rate at the WQCV elevation (2.$' deep) is calculated at 1.71 CFS,
which includes a base flow of 1 CFS for release of nuisance flows in the ditch, using Urban
Drainage and Flood Control District flow capacity worksheet. An armored forebay is included at
' the main 36" RCP outfall into the pond to collect silt and trash before the runoff can enter the
pond.
' The proposed pond will have a new maximum 100-year volume of approximately 118,760 CF,
which is an increase of approximately 28,930 CF over the volume of the current pond. This
volume is based on a water surface at the proposed spillway elevation. Additional volume over
' the 118,760 CF is provided within the one foot of freeboard to the top of the proposed berm. In
addition, an engineered/armored spillway has been incorporated into the pond which has the
capacity to convey the total 100-year flow to the downstream ditch.
CONCLUSIONS
' In summary, this project was designed to improve numerous drainage conditions at the FRCC
site. The existing pond, which has an unsafe berm and lacks water quality features, will be
rebuilt and consolidated with a new larger water quality/detention pond. The new pond will
' detain approximately 28,930 CF more than the existing pond. The previous release rate for the
existing northerly pond was designed with an allowable release rate of 6.12 CFS per the
Landmark report. The new pond will now capture both the southerly and northerly portion of the
' site and has a limited release orifice which has a conservatively -designed allowable release rate
of 7.72 CFS. The lushly vegetated ditch will remain in tact and will be improved by redirecting
sediment -laden tributary runoff from the ditch to the forebay and water quality basin via an
' upgraded storm system.
Please note that this drainage analysis was prepared under my direct supervision. JVA, Inc.
' understands that the City of Fort Collins does not and will not assume liability for drainage
facilities designed by others. If you have any questions or comments regarding this dra�'t1age
letter submission, please feel free to call us to discuss. ,��i�11U11iIlltrtlNj����U
JVA,
Xavier
tDesign
Charles R. Hager, IV, P.E. #37146
Associate/Project Manager
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April 30, 1996
Project No. DAVP-5J1D=01-303A1
zz
INEER
CONSULTING ENG
Landmark Engineerin
3521 West Eisenhower E
Loveland, Colorado
ISECTION 1
' EXECUTIVE SUMMARY
DRAINAGE STUDY
This section explains the purpose of the Drainage Study and presents a summary of the major
findings and recommendations. The development of the recommendations is presented in the
following sections of this report.
' Introduction
The Front Range Community College is located in the Northwest 1/4 of Section 2, Township 6
' North, Range 69 West of the 6th Principal Meridian in Larimer County at the Southeast corner
of the intersection of South Shields Street and West Harmony Road. The site contains 44.11
' acres. Presently, the proposed improvements for this site consist of the following: a science
classroom building, a student center and library, grading and paving of a vehicle parldng lot for
the library and miscellaneous site and landscape improvements. Future expansions could include
' an additional 50,000 sq. ft. of buildings and 110,000 sq. ft. of additional parldng lots.
' The purpose of this drainage study is to provide comprehensive drainage planning for the
proposed improvements. This includes identifying and defining solutions to drainage problems
' which may occur onsite and offsite as a result of the improvements and identifying drainage
structures and other drainage features which should be included in the improvement plans to
provide a safe and economical drainage system design.
This Drainage Study evaluates the existing drainage patterns for the development based on the
Comprehensive Drainage Plan for this site. This includes evaluating historic runoff, investigating
routing for design storms through the site, determining what improvements and structures are
necessary along with required design capacity and evaluating offsite drainage which may be
' affected by the site improvements.
The policy and guidelines in the 1984 City of Fort Collins Storm Drainage Criteria and
i! Construction Standards Manual have been utilized for planning drainage facilities. A major storm
' The second source of offsite runoff is Mail Creek as it spills over West Harmony Road near the
intersection of South Shields Street. Again, from discussions with the City of Fort Collins staff,
' the 100-Year flow which overtops West Harmony Road is 35.2 cfs Adequate conveyOce
be provided to reduce the risks of f flooding any existing at proposed buildings.
' The third source of offsite runoff is from the rear yards of the houses adjacent to the Southerly
boundary. However, currently there are two ditches near the Southern property line which
' conveys the offsite runoff through this site and the adjacent site to the East. One of the ditches
is located immediately North of the Southern boundary and the other ditch is located immediately
South of the existing fence.
3) Onsite Storm Drainage System
lob—yecw-)
' Thee 'sting drainage patterns will be maintained. An existing 12-inch clay storm sewer located.
North f Buildings 'B" and "C" will be replaced. The new storm sewer is sized to convey the
' Lrunoff from the existing buildings and the proposed Science Building, as well as from a portion
of the proposed library and a future 50,000 square foot building to be located North of the
library. This * ormm sewer will be discharged into a proposed Swale and will be conveyed to the
' proposed detention pond located at the Northeast corner of the site. There is another existing
stoig sAe? located between Building "A" and Buildings 'B" and "C". This storm sewer
' conveys the remainder of the roof runoff from buildings 'B" and "C" and all of the runoff from
Building "A" to an existing swale which will drain into the proposed detention pond. This storm
tsewer is not planned to be modified at this time.
' The Student Center Building as well as approximately one-half of the library is planned to
surface drain onto the existing parking lot. The existing concrete pan conveys the runoff Easterly
to the existing channel adjacent to the parking lot.
' 5wgG4)Detention Facilities / j5��f Jze
Currently, the site drains, undetained, into the existing grass channel which conveys the runoff
' to Mail Creek approximately 1/4 mile East of the college. However, the proposed buildings and
parking lot expansion will increase the peak runoff from the site. From discussions with the City
of Fort Collins staff, the updated Master Plan for Mail Creek will require that all future
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FOR REFERENCE ONLY
NOTACIX ELFRUCTOND000MENT
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4816 S. SHIELDS STREET
PORT COLLINS, CO 60527
DRAM BY: IOIB
APPROVED BY: flRP
THESE[RAVINGS ARE THE PRWECT
IMNLNLARE INBTRLMERROE
REWVNTRE PFIYIAGORAF
ARZHITECTS UNAUTHORIZED
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MAP ME PRINT ON AN PAN AS NIPPON' IN FIRITURF RETURN"
D %OGBi 6JVIF/MO
cwLOTre, xoRTH cwauruam
I ]v Jm♦
389SJM PaRXwA Leu�IL� 'asunEtm
nej Piarns.c
NORTHERN
ENGINEERING
SUNLIGHT PEAK &
CHALLENGER POINT
REMODEL
FRONT RANGE COMMUNITY COLLEGE
LARIMER CAMPUS
4818 S. SHIELDS STREET
FORT COLLINS, CO 80527THESE DIAPPAPPINGS AND THE PROODECT
PRDRCi HQ. FE N6l@
DMNN BY' RRB
APPROVED BY'. RNP
FE IHBaVY�ENi8a6FANCE.VID NPMU01 ail<Fw.L6RODP
AACXrtECi6. UN1 V MOXUEO p1AMAPpN
OmRaR1E�Eo MUT VMIrtEXCpNREXTIS
61EETTIRE
EROSION
CONTROL
DETAILS
91EEf Mllmt
DT5
ATUREATENE A, ANT, NUARTA IT., A , I PAR AREA , AT REAM AN AREA A ANTRAMPARRAN AM NA AT APAI RAPPEATUAT
MAP ME PRINT ON AN PAN AS NIPPON' IN FIRITURF RETURN"
D %OGBi 6JVIF/MO
cwLOTre, xoRTH cwauruam
I ]v Jm♦
389SJM PaRXwA Leu�IL� 'asunEtm
nej Piarns.c
NORTHERN
ENGINEERING
SUNLIGHT PEAK &
CHALLENGER POINT
REMODEL
FRONT RANGE COMMUNITY COLLEGE
LARIMER CAMPUS
4818 S. SHIELDS STREET
FORT COLLINS, CO 80527THESE DIAPPAPPINGS AND THE PROODECT
PRDRCi HQ. FE N6l@
DMNN BY' RRB
APPROVED BY'. RNP
FE IHBaVY�ENi8a6FANCE.VID NPMU01 ail<Fw.L6RODP
AACXrtECi6. UN1 V MOXUEO p1AMAPpN
OmRaR1E�Eo MUT VMIrtEXCpNREXTIS
61EETTIRE
EROSION
CONTROL
DETAILS
91EEf Mllmt
DT5