HomeMy WebLinkAboutPVH HEALTH SYSTEMS, HARMONY CAMPUS, 5TH FILING, HEALTHY LIVING CENTER - PDP - 32-98I - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTVICINITY MAP
SCALE: 1" = 1500'
VICINITY MAP
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McClellands Basin Drainage Master Planning concepts accepted by the City of Fort
Collins.
If groundwater is encountered at the time of construction, a Colorado Department of
Health Construction Dewatering Permit will be required.
C. Storm Water Quality
Storm water quality will be addressed through the use of gravel inlet filters, erosion
control fence, existing grass -lined detention ponds, and extended detention in Pond
593.
D. Erosion Control Concept
The proposed erosion control concepts will adequately provide for the control of
wind and rainfall erosion from Poudre Valley Hospital. Through the construction of
the proposed erosion control concepts, the City of Fort Collins performance standards
will be met.
REFERENCES
Storm Drainage Design Criteria and Construction Standards by the City of Fort
Collins, Colorado, May 1984, Revised January 1997.
2. Erosion Control Reference Manual for Construction Sites by the City of Fort Collins,
Colorado, January 1991, Revised January 1997.
3. McClellands Basin 100-Year Master Plan Update, by Icon Inc., Fort Collins,
4. Final Drainage and Erosion Control Report Poudre Valley Health Systems Harmony
Campus Infrastructure Project Development Plan, Fort Collins, Colorado, May 12,
2004.
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V. STORM WATER QUALITY
A. General Concept
Storm Water Quality will be provided through extended detention, presently provided
by existing Pond 593. This pond was constructed with PVH Filing 2.
B. Specific Details
Best Management Practices (BMP) for the treatment of storm water runoff will be
provided through the use of gravel inlet filters, erosion control fence, and the existing
grass -lined detention ponds 393 and 593. Furthermore, pond 593 will provide
extended detention through its outlet structure. Erosion control fence shall be
installed where shown in the final plans. Gravel inlet filters shall be installed for all
storm drain inlets. Final calculations will be provided with the Final Drainage
Report.
VI. EROSION CONTROL
A. General Concept
At this time no erosion control calculations have been completed. These will be
completed in Final Design.
VII. CONCLUSIONS
A. Compliance with Standards
All computations within this report have been completed in compliance with the City
of Fort Collins Storm Drainage Design Criteria. The City of Fort Collins Storm
water Utility will not maintain the on -site storm drainage facilities within the Poudre
Valley Hospital site. The owners of the Poudre Valley Hospital site will maintain
their on -site storm drainage facilities on a regular basis.
B. Drainage Concept
The proposed drainage concepts presented in this study and those shown on the final
I utility plans will adequately provide for the transmission of developed on -site runoff
to the proposed detention ponds. The combination of on -site street capacities and the
on -site storm sewer system will provide for the developed flows to reach the
I proposed detention ponds. The sizes, locations and release rates of these ponds will
allow the Poudre Valley Hospital site to develop in conformance with the
I9
The runoff from the roof of the Healthy Living Center (basins 207 & 208) will be
captured by a series of roof drains. The central and eastern portions of the roof (basin
207) will drain to the north and be conveyed east in the proposed storm drain in the
landscaped area north of the building. This storm drain will also convey flows east
into Swale A. The western portion of the roof (basin 208) will drain to the south and
be released overland, south of the building.
The runoff from basin 205 will flow overland towards a low point, located at the
southeast corner of the parking lot. Here, the runoff will be conveyed east through a
curb cut and into Swale A.
Runoff from basin 206 will flow southeast down the private drive towards design
point 206. Here, the flow will be released overland and will continue southeast and
into Swale A.
It is important to note that the existing 43" x 68" elliptical equalizer pipe between the
existing north and south equalizer ponds (Pond 393 on PVH Filing 1 & 2 Plans) will
be abandoned when the north pond is expanded and the south pond removed. Pond
393 will continue to serve primarily as a decorative retention/irrigation pond.
The runoff from basins 50 and 51 of PVH Filing 2 will continue to be routed through
Pond 393. The proposed storm drain upstream of basins 52 and 53 (PVH Filing 2)
will be extended into Pond 393. The invert elevation of the extension will be set to
control the water surface elevation, thereby passing runoff from basins 50 and 51
through Pond 393. The release will combine with that from basins 52 and 53 at the
existing inlets in the private drive. The combined flow from basins 50-53 will
continue to be routed south and east in the existing 24" storm drain. The existing 24"
flared -end -section will be removed and proposed 24" storm drain added to allow
connection into the proposed 54" RCP at design point 203A. Here, the flow from
basins 50-53 of PVH Filing 2, will combine with that from PVH Filing 1 and basins
201-203 of PVH Filing 4, and continue east in the proposed 54" RCP. Ultimately,
the runoff from basins 201-204 and those basins from PVH Filings 1 and 2
mentioned above, is conveyed east through the proposed storm drain, into Swale A,
then south and east into Pond 593.
Please refer to the PVHS Filing 2 Drainage and Erosion Control Report for more
detailed information on basin 103, and Ponds 393 and 593.
SWMM Model
Please refer to the PVHS Filing 2 Drainage and Erosion Control Report.
H.
The storm flows from the Healthy Living Center Site will be conveyed to proposed
area inlets, curb inlets, and a curb cut within the parking lot. The flows captured at
' these locations, will be conveyed east in the proposed storm drain line and released
into the proposed swale (Swale A), east of the parking lot. Swale A will carry the
flows south and into the existing swale, running south through basin 103 of the
PVHS Master Infrastructure plans (see exhibit in Appendix Q.
It is important to note that the southern equalizer pond (Pond 393) is not necessary.
This means that the north equalizer pond will be reconfigured as a decorative pond
for irrigation and to pass through storm flows. The stormwater from a portion of
I Snow Mesa and Harmony Road (basins 50 and 51 of PVH Filing 2) will pass through
the pond to design point 53. The flow will continue on to design point 203A, then
into Swale A, and ultimately into Pond 593, located in the southeast corner of the
PVH site.
Furthermore, though the Healthy Living Center Site will increase impervious area
within basin 103, upsizing is not required due to the SWMM Model from the PVHS
Filing 2 Report, which provides a detention pond (Pond 593) in the Southeast corner
of the PVH Site. The SWMM model provided for 80% imperviousness over the
Ientire PVH Site. Water quality for the entire PVH site is provided for in Pond 593.
It is important to note that Pond 593 is only partially constructed at this time. The
current build -out of Pond 593 provides the required detention due to the development
of the Healthy Living Center. The remaining portion of Pond 593 will be constructed
along with future developments within the PVH Site.
eB. Specific Details
The Healthy Living Center Site contains approximately 9.24 acres. Runoff from the
site will be routed east into Swale A.
tA small western portion (basin 201) of the Healthy Living Center Site will flow west
and will be captured by the existing 15' Type R Inlet (design point 201). The flow
' from basin 201 will join with flows from PVH Filing 1 (basins 1, 12, & 14-20) and
flows from PVH Filing 2 (basins 50-53, & 104) and will conveyed east in the
existing 43" x 68" elliptical storm drain.
Meanwhile, runoff from basins 202-206 will be conveyed to its respective design
point. A 5' Type R Inlet will capture runoff from basin 202, while area inlets will
capture runoff for basins 203 and 204. Once captured, the flows from basins 202-204
combine with that from basin 201 and the above mentioned PVH Filing 1 and 2
basins, and are routed east in the existing and proposed storm drain, and into Swale
' A.
VA
III. DRAINAGE BASIN CRITERIA
A. Regulations
The City of Fort Collins Storm Drainage Design Criteria is being used for the subject
site.
B. Development Criteria Reference and Constraints
I The criteria and constraints from The McClellands Basin 100-Year Master Plan and
the subsequent update, dated March 2000 by Icon Engineering will be utilized in this
Drainage Study. The Poudre Valley Hospital site is currently being utilized as
■ fallow agricultural land
C. Hydrologic Criteria
The SWMM hydrologic model that was previously used in the McClellands Basin
100-Year Master Plan Update by Icon Engineering has been utilized and updated in
PVH Master Infrastructure report in order to analyze the hydrologic conditions of the
proposed Healthy Living Center Site. Furthermore, rational calculations have been
provided in Appendix B for the site, as well as curb cut and storm drain sizing using
UDInlet and UDSewer.
D. Hydraulic Criteria
All calculations within this study have been prepared in accordance with the City of
Fort Collins Storm Drainage Criteria and are included in the PVHS Filing 2 Report
appendix.
IV. DRAINAGE FACILITY DESIGN
A. General Concept
■
The purpose of this report is to address the storm drainage flows from the
I development of the Healthy Living Center Site, in relation to the Master Drainage
Plan contained in the PVHS Filing 2 Drainage Report, May 12, 2004.
I The Healthy Living Center Site is contained within basin 103 of the PVHS Filing 2
Report (see Drainage Exhibit in Appendix Q. The Healthy Living Center Site
accounts for approximately 9.24 acres of the 22.26 acres in basin 103.
I
C
PRELIMINARY DRAINAGE AND EROSION CONTROL REPORT
FOR THE POUDRE VALLEY HEALTH SYSTEMS
HEALTHY LIVING CENTER, FILING 4.
FORT COLLINS, COLORADO
I. GENERAL LOCATION AND DESCRIPTION
A. Location
The Poudre Valley Health Systems site is located south of Harmony Road and east of
Timberline Road in southeastern Fort Collins, Colorado. The site is shown on the
Vicinity Map in Appendix A. More particularly, the site is situated in the
northwesterly portion of Section 5, Township 6 North, Range 68 West of the Sixth
P.M., City of Fort Collins, Larimer County, Colorado.
B. Description of Property
The Healthy Living Center Site is located in the north portion of the PVH Site and
accounts for approximately 9.24 acres of the 72.6 acres contained within the Poudre
Valley Health Systems Harmony Campus Medical Center Filing 2. The Healthy
Living Center Site currently consists of fallow farmland, a detention pond, and some
landscaping on the west boundary. A private drive also extends along the north
property line. The site generally slopes to the east at approximately 2.0%.
II. DRAINAGE BASINS
A. Major Basin Description
The Healthy Living Center site lies entirely within the McClellands Basin. The
project drainage is modeled in The McClellands Creek Master Drainage PlanUpdate
(March 2000). Applicable portions of these studies are included in Appendix C, of
the PVHS Harmony Campus Infrastructure Project Development Plan Drainage and
Erosion Control Report, May 12, 2004.
(See Major Basin Description in above Report)
B. Sub -Basin Description
(See PVHS Filing 2 Drainage Report)
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APPENDIX
PAGE
VICINITY MAP A
RATIONAL CALCULATIONS, CURB CUT & STORM DRAIN SIZING B
DRAINAGE & EROSION CONTROL PLAN DRAWING C
TABLE OF CONTENTS
DESCRIPTION
I. GENERAL LOCATION AND DESCRIPTION
A. LOCATION
B. DESCRIPTION OF PROPERTY
H. DRAINAGE BASINS
A. MAJOR BASIN DESCRIPTION
B. SUB -BASIN DESCRIPTION
III. DRAINAGE DESIGN CRITERIA
A. REGULATIONS
B. DEVELOPMENT CRITERIA REFERENCE AND CONSTRAINTS
C. HYDROLOGICAL CRITERIA
D. HYDRAULIC CRITERIA
IV. DRAINAGE FACILITY DESIGN
A. GENERAL CONCEPT
B. SPECIFIC DETAILS
V. STORM WATER QUALITY
A. GENERAL CONCEPT
B. SPECIFIC DETAILS
VI. EROSION CONTROL
A. GENERAL CONCEPT
VII. CONCLUSIONS
A. COMPLIANCE WITH STANDARDS
B. DRAINAGE CONCEPT
C. STORM WATER QUALITY
D. EROSION CONTROL CONCEPT
REFERENCES
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Stantec Consulting Inc
209 South Meldrum Street
Fort Collins CO 80521-2603
Tel: (970) 482-5922 Fax: (970) 482-6368
stantm.com
Stantec
February 15"
Mr. Basil Hamdan
City of Fort Collins
Water Utilities --Storm water
700 Wood Street
Fort Collins, Colorado 80521
RE: Preliminary Drainage and Erosion Control Report for Poudre Valley Health Systems
Harmony Campus Healthy Living Center, Filing 4.
Dear Basil:
We are pleased to submit to you, for your review and approval, this Preliminary Drainage and
Erosion Control Report for Poudre Valley Health Systems Harmony Campus Healthy Living Center,
Filing 4. All computations within this report have been completed in compliance with the City of
Fort Collins Storm Drainage Design Criteria, and adhere to the Final Drainage and Erosion Control
Report for the Poudre Valley Health Systems Harmony Campus Infrastructure Project Development
Plan, Fort Collins, Colorado, May12, 2004.
We appreciate your time and consideration in reviewing this submittal. Please call if you have any
questions.
Respectfully,
Stantec
Prepared by:
John Gooch, EIT Jim Allen -Morley, P.E.
Project Engineer Project Manager
Preliminary
Drainage and Erosion
Control Rep
ort
ortt p
Stantec
Poudre Valley Health Systems
Harmony Campus
Healthy Living Center, Filing 4
Fort Collins, CO
February 15, 2005
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