HomeMy WebLinkAboutDrainage Reports - 04/28/2017FINAL DRAINAGE STUDY
FORT COLLINS EMERGENCY CENTER
4858 S.-COLLEGE AVENUE
FORT COLLINS, COLORADO
City of Fort Collins Approved Plans
Approved
Date: 44"s 2ot-i
Prepared By:
Perception Design Group, Inc.
6901 South Pierce Street, Suite 350
Littleton, CO 80128
Contact: Jerry W. Davidson, P.E.
303-232-8088
QAJ
OL
ONA
Colorado ECL Land, LLC
3620 Whitestone Blvd. East
Cedar Park, TX 78613
Contact: Dr. Henry Higgins
512-983-1561
Job No. 2015-014
December 27, 2016
FINAL DRAINAGE STUDY
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
I. GENERAL LOCATION AND DESCRIPTION
A. Location
The Fort Collins Emergency Center project is located on the east side of S.
College Ave. Frontage Road at 4858 S. College Avenue. The site is roughly
midway between Fairway Lane and Palmer Drive. The site is more specifically
known as Lot 10, less the north 15 feet; all of Lots 11, 12, 13, 14, 15 and 16,
Replat of a Part of Fairway Estates, County of Larimer, State of Colorado. The
site is located in Section 1, Township 6 North, Range 69 West, 6th PM, Larimer
County, Colorado. Site area is 1.15 acres.
There are no major drainage facilities on the site. A drainage easement exists
along the east property line for the benefit of the property north. Adjacent
developments include an office building to the south, large lot residential to the
east, and commercial development to the north. Vacant ground zoned for
commercial development is across College Avenue to the west.
B. Description of Property
Site area is 1.15 acres. The site is currently undeveloped and covered with native
grasses. There are no substantial trees on the property. Site soils are identified
as Fort Collins and Nunn soils on the USDA Web Soil Survey. These soils are
classified as loam and clay loam soils. Site topography slopes from the northwest
corner to the southeast corner at 2-3%. There are no major drainage facilities on
the site. Proposed development includes the construction of a 1 story emergency
medical building with associated parking and utilities. An irrigation ditch exists
along the east property line. Proposed land use is an emergency medical facility.
C. Floodplain Submittal Requirements
The site does not lie within a floodplain.
II. DRAINAGE BASINS AND SUB -BASINS
A. Major Drainage Descriptions
The site is tributary to Fossil Creek. The drainage channel is approximately 0.35
miles south of the property. The Fossil Creek basin upstream of the site is
FINAL DRAINAGE STUDY
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
primarily undeveloped land with some residential. The site falls on Flood
Insurance Rate Map 08069C1000F. This is an unpublished panel. The index
sheet indicates that there are "No Special Flood Hazard Areas" on the panel. No
irrigation facilities will be impacted by the proposed development.
B. Sub -Basin Description
Historic drainage patterns thru the site convey storm waters overland from a high
point of 5004 at the northwest property corner to a low elevation of 4,997 at the
southeast property corner. Slopes are uniform at 2-3%. Site flows are overland
with no channelization. A swale exists at the downstream corner to convey runoff
southerly across adjacent property. An existing drainage easement is in place to
accept these flows and can be found at reception number 90045868. A small
portion of the site along the north property line is paved. This paved area is
directed easterly to an existing inlet in the paved cul-de-sac. Developed drainage
patterns will convey waters to a new detention facility along the east property
line. Pond outfall will be to the existing swale at the southeast corner of the
property. Runoff from the paved portion of the site along the north property line
will continue in the historic manner.
Offsite flow from the property north is collected in the aforementioned inlet in the
cul-de-sac. The cul-de-sac area is a surface detention pond for the developed lot
north. Runoff from this site along with the common drive is collected in this pond
and discharged in a controlled manner. The discharge pipe from the pond enters
the northeast corner of the Emergency Center lot then runs parallel to the east
property line in an existing drainage easement. The pipe daylights to a ditch and
surface drainage continues to the south onto the State Farm lot.
Developed Basin Descriptions:
Basin A is a 0.16 acre basin located along the north property line. This basin
receives detention attenuation in the existing pond built for the lot to the north.
This pond is a surface pond located in the existing cul-de-sac which straddles the
north property line. Water quality treatment is not currently provided for this basin
nor will it be provided with this development as water quality is not provided in
the existing detention pond which is entirely paved. The area of basin A
increases the area tributary to the cul-de-sac pond by 0.05 acres. Using a C
value of 0.72 and I of 7.0 (7.0 is the intensity used in the Stewart report) the
increased runoff to the cul-de-sac pond is 0.25 cfs. Runoff to the cul-de-sac pond
per the Stewart report is 4.41 cfs. This represents a 5.6% increase in anticipated
runoff. To mitigate this increase, the Emergency Center detention pond has
excess capacity of 1,204 cf. Using a volume provided per area, required storage
is 9,936 cf per acre. The 1,204 cf of excess capacity would service an additional
0.12 acres with similar coverage characteristics. Therefore, while additional
storage is not provided in the cul-de-sac pond, adequate excess detention is
FINAL DRAINAGE STUDY
FORT COLLINS EMERGENCY CENTER
4868 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
provided in the Emergency Center pond. To utilize the excess storage, a berm is
proposed at the northeast corner of the site to direct overflow from the cul-de-sac
pond into the Emergency Center pond.
Basin B is a 0.68 acre basin encompassing the majority of the developed site.
Both detention and water quality are provided for this basin in a new sand filter
and detention basin located in the rear of the property. The detention volume is
provided above the sand filter volume. Additionally LID treatment areas are
included in this basin. Porous pavement areas are provided in LID treatment
areas label LID area 2, and 3 on the drainage map.
Basin C is a small basin in the parking lot on the north side of the building.
Detention and water quality are provided in the aforementioned facility discussed
above. LID treatment is provided in this basin in LID area 1 labeled on the
drainage map.
Basin D is a 0.15 acre basin on the east and south perimeter of the property.
This area is down grade from the detention facility and therefore detention and
water quality are not provided for this basin. This basin is landscape area and will
not contribute runoff in excess of historic rates. The Emergency Center site was
previously examined when the State Farm building was constructed downstream
of the site. In the State Farm report, it was anticipated that 2.24 cfs would flow off
the Emergency Center site onto State Farm. Combining basin D runoff and the
detention outflow of 0.51 cfs, runoff onto State Farm is calculated at 0.97 cfs for
the 100 year storm. This is less than half the anticipated flow thus allowance and
conveyance is provided thru the State Farm site.
Basin E is a 0.12 acre basin along the west property line. Site grading constraints
prevent this basin from being conveyed to the detention pond. Runoff from Basin
E is directly into the public right of way. Runoff continues south where it will
combine with runoff from State Farm on Fairway Lane. Adding the 0.97 cfs from
above and the 1.07 cfs from basin E, the total is 2.04 cfs, which is below the
anticipated runoff of 2.24 cfs mentioned above.
0 Ill. DRAINAGE DESIGN CRITERIA
A. Regulations
Drainage design criteria uses the Fort Collins Storm Drainage Design and
Technical Criteria which is an amended version of the Urban Drainage and Flood
Control District Criteria.
B. 4 Step Process
FINAL DRAINAGE STUDY
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
Step 1: Employ Runoff Reduction Practices. Runoff is reduced by implementing
porous pavement areas. All parking stall areas are treated with permeable
pavement. Site runoff is routed thru a grass area prior to entering the detention
pond.
Step 2: Implement BMPs That Provide a Water Quality Capture Volume with
Slow Release. Slow release water quality is achieved thru the sand filter
detention facility.
Step 3: Stabilize Streams. No streams existing on, or immediately adjacent to the
property. No structured stream stabilization is proposed. However, development
fees and the construction of a detention and water quality facility will both
improve the receiving stream.
Step 4: Implement Site Specific and Other Source Control BMPs. Reference the
Storm Water Management Plan under separate cover for site specific and source
controls.
C. Development Criteria Reference and Constraints
Prior drainage studies are available for both the property north and south of the
subject property. The property to the north was studied in a report entitled "Storm
Drainage and Erosion Control Report for Advantage Retail Center at 484 South
College Avenue in the Fossil Creek Basin" prepared by Stewart and Associates,
Inc. and approved by the City of Fort Collins May 19, 1999. In this study,
developed runoff is controlled thru the construction of a detention facility located
in the cul-de-sac at the southeast corner of the site. Outfall is routed along the
east property line of the Emergency Center property continuing southward onto
the State Farm property. Easements exist for these drainage rights.
The property south of the Emergency Center property was studied in a report
entitled "Drainage Report State Farm Service Center Addition 4900 South
College Avenue Fort Collins, Colorado" prepared by ARIX Corporation and dated
August 29, 1990. In this study, allowance was made for conveyance of runoff
from the Emergency Center lot. A grass swale was proposed and constructed at
the northeast corner of the State Farm lot to convey the runoff thru the State
Farm site. Reference the appendix to see excerpts from the ARIX report. In these
excerpts note that the Emergency Center site is illustrated as basin Al.
Reproducing the ARIX calculations the runoff from basin Al is calculated at 2.24
cfs for the 100 year storm. This compares to a proposed release of 0.51 cfs for
the Emergency Center site. In addition to conveyance allowance, a drainage
easement was established and recorded at reception number 90045868 to
memorialize the drainage right.
- D. Hydrological Criteria
FINAL DRAINAGE STUDY
FORT COLLINS EMERGENCY CENTER
4868 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
Design rainfalls used for the 2 year storm are 0.82 inches in one hour and 0.98
inches in two hours. 100 year values are 2.86 inches for one hour and 3.67
inches for two hours. A 5 minute time of concentration is used due to the small
size of the site. Runoff is estimated using the rational method. Detention
calculations are performed using the City provided spreadsheet which is a
modified form of the FAA procedure. A 2 year historic discharge rate is used.
Design storms for the project are the 2 year and 100 year. Water quality is
provided via a sand filter basin.
E. Hydraulic Criteria
Pipe capacity calculations are based upon Manning's equation.
F. Floodplain Regulation Compliance
No floodplain modifications are proposed.
G. Modifications of Criteria
None.
IV. DRAINAGE FACILITY DESIGN
A. General Concept
Post development drainage patterns convey surface site runoff via overland flow
to the proposed detention and water quality facility located along the east
property line. Roof drainage will be surface discharged. Surface flows will be
routed over permeable pavement areas which are designed with underdrain
systems that discharge to the detention facility. Runoff will be collected at a curb
cut at the southeast corner of the parking lot and conveyed thru a grass swale to
the detention / water quality facility.
B. Specific Details
Detention and Water Quality
As a part of this development, a new detention and water quality facility is to be
constructed. Site waters will surface flow into the facility and a piped discharge
will be provided to the existing Swale on the property south of the site. Pond
specifics are summarized as follows:
Required Water Quality Volume 476 cf
FINAL DRAINAGE STUDY
FORT COLLINS EMERGENCY CENTER
4868 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
Provided Water Quality Volume
476 cf
Water Quality Elevation
4997.85 ft
Required 100 yr Volume
6,678 cf
Required 100 yr + WQ Volume
7,154 cf
Provided 100 yr + WQ Volume
8,358 cf
100 yr + WQ Elevation
4999.80 ft
Spillway Elevation
18
4999.80 ft
Freeboard Elevation
5000.80 ft
100 yr Release Rate
0.51 cfs
An emergency spillway is provided for the detention pond at the southeast corner
of the site. The spillway is designed for twice the 100 year flow into the pond or
12.98 cfs. The spillway is protected with buried riprap over the spillway and on
the downstream side. Provided spillway width is 12 feet at a flow depth of 6
inches.
The pond release rate is calculated as the 2 year historic release from the basins
contributing to the pond. This would be basins B and C. Combined 2 year historic
flows from these two basins is 0.51 cfs.
The outfall pipe for the existing cul-de-sac pond runs along the east side of the
Emergency Center site. As a part of this development, this pipe will be
intercepted and combined with the outfall from the Emergency Center pond.
Combined pond outfall is piped to an existing swale on the adjacent property
south.
Detention and water quality facilities require regular maintenance to ensure long
term performance. Maintenance access is provided from the adjacent parking lot.
The outlet structure should be inspected and cleaned at least 1 time per month.
Inspection should verify trash screens and orifice plates are clear of all debris.
Grass clippings should be collected with each mowing to prevent clogging. Trash
and debris should be collected weekly from both the pond and site to reduce the
risk of orifice clogging.
The detention and water quality facility will be located within a dedicated
41 drainage easement.
Offsite conveyance is provided in the existing swale along the east property line
of the adjacent property. Runoff continues south thru an existing detention facility
to storm sewer.
LID Treatment:
FINAL DRAINAGE STUDY
FORT COLLINS EMERGENCY CENTER
4868 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
LID treatment is provided in 4 porous pavement treatment areas. City
requirements are met as follows:
New Impervious Area = 25,265 sf
Required 50% Area to be treated = 12,633 sf
Actual Area Treated = 13,474 sf
New Pavement Area=16,632 sf
Required 25% Porous Pavement =4,158 sf
Actual Porous Pavement Area =4,808 sf
Reference appendix for detailed LID requirement calculation spreadsheet.
V. CONCLUSIONS
The Fort Collins Emergency Center is in compliance with City Drainage Criteria.
The project will have a net positive effect on downstream properties by providing
detention and water quality to limit runoff to code dictated rates. Water quality will
be improved, and runoff from the major storm will be reduced from historic levels.
VI. REFERENCES
Fort Collins Stormwater Criteria Manual, Revised May, 2013.
Urban Storm Drainage Criteria Manual Volumes 1. 2 & 3, Denver Colorado. Current
editions.
Web Soil Survey, United States Department of Agriculture
. Flood Insurance Rate Map, Map Number 08069CIND2D, February 6, 2013, FEMA
Storm Drainage and Erosion Control Report for Advantage Retail Center at 484 South
• College Avenue in the Fossil Creek Basin prepared by Stewart and Associates, Inc. and
approved by the City of Fort Collins May 19, 1999
Drainage Report State Farm Service Center Addition 4900 South College Avenue Fort
Collins. Colorado prepared by ARIX Corporation and dated August 29, 1990
Stormwater
Alternative ComplianceNariance Application
City of Fort Collins Water Utilities Engineering
Engineer Name Jerry Davidson -Perception Design Group Phone 303-232-8088
Street Address 6901 S. Pierce Street, Suite 350
City Littleton State Colorado Zip 80128
Owner Name Colorado EC Land LLC Phone 512-983-1561
Street Address 3620 East Whitestone Blvd.
City Cedar Park State Texas Zip 78613
Project Name Fort Collins Emergency Center
Project/Application Number from Development Review (i.e. FDP123456) FDP160030
Legal description and/or address of property 4858 S. College Ave,
Lot 1 Fairway Estates Filing Four (to be recorded)
Description of Project New freestanding emergency room medical facility
Existing Use (check one): Q residential O non-residential O mixed use Q vacant ground
Proposed Use (check one): d residential *non-residential O rnixed-use Q other
i If non-residential or mixed use, describe in detail New freestanding emergency room medical facility
on 1.15 acres.
State the requirement from which alternative compliance/variance is sought. (Please include
applicable Drainage Criteria Manual volume, chapter and section.)
. UDCFD Vol 1,2.0,2.8 "Attempts Should Be Made to Reduce Stormwater Runoff Rates..."
What hardship prevents this site from meeting the requirement?
See attachment.
Attach separate sheet it necessary
What alternative is proposed for the site?
See attachment.
Attach separate sheet it necessary
ro'yl8
Per cep ti on
design group/ inc.
6901 South Pierce Sates. Suite 350 Littlelen. Cal"a 90123 Vaiee 303-232-8088 Fae 303.232.5255
October 5, 2016
Mr. Dan Mogen
City of Fort Collins
Water Utilities Engineering
City of Fort Collins
700 Wood Street
Fort Collins, CO 80522
RE: 4858 S. College Ave — Emergency Room
Supplement to Stormwater Alternative ComplianceNariance Application
What hardship Prevents this site from meeting the requirement?
Site topography and building placement requirements create 2 basins which are not tributary to
the detention pond.
Basin D represents areas on the downstream embankment of the detention pond. This area will
remain in pervious landscape coverage. Runoff generated from D is 0.46 cfs for the 100 year
storm. Basin area is 0.15 acres.
Basin E represents areas adjacent to the public ROW on the west side of the site. To maintain
proper drainage away from the building, runoff from this basin is directed into the public ROW.
This basin contains both landscape areas and concrete sidewalks. Runoff generated from E is
0.92 cfs for the 100 year storm. Basin area is 0.12 acres.
What alternative is proposed for the site?
Basin D: The Emergency Center site was previously examined when the State Farm building was
constructed downstream of the site. In the State Farm report, it was anticipated that 2.24 cfs
would flow off the Emergency Center site onto State Farm. Combining basin D runoff and the
detention outflow of 0.51 cfs, runoff onto State Farm is calculated at 0.97 cfs for the 100 year
storm. This is less than half the anticipated flow thus allowance and conveyance is provided thru
the State Farm site.
Basin E: Runoff from basin E flows directly into the public ROW. Runoff continues south where
it will combine with runoff from State Farm on Fairway Lane. Adding the 0.97 cfs from above
and the 0.92 cfs from basin E, the total is 1.89 cfs, which is below the anticipated runoff of 2.24
cfs mentioned above.
page 2
The owner agrees to comply with the provisions of the zoning ordinance, building code and all other
applicable sections of the City Code, Land Use Code, City Plan and all other laws and ordinances
affecting the construction and occupancy of the proposed building that are not directly approved by
this variance. The owner understands that if this variance is approved, the structure and its occupants
may be more susceptible to flood or runoff damage as well as other adverse drainage issues.
Signature of owner: Date: 10/12/2016
The engineer hereby certifies that the above informatio along with the reference plans and project
descriptions is correct.
Signature of engineer: Date: 10/12/2016
Date complete application subm
Date of approvalldenial:
Staff justification/notes/conditio
Approved by:_,Y2
Entered in UtilityFile
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FORT COLLINS EMERGENCY CENTER
4868 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
APPENDICES
A - HYDROLOGIC COMPUTATIONS
B - DETENTION / WATER QUALITY DESIGN
C - KEYMAP, SOILS, FIRM
D- EXCERPTS FROM ADJACENT STUDIES
E - DRAINAGE PLAN
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
A - HYDROLOGIC COMPUTATIONS
(11) Section 4.0 is amended to read as follows:
4.0 Intensity -Duration -Frequency Curves for Rational Method:
The one -hour rainfall Intensity -Duration -Frequency tables for use the Rational Method
of runoff analysis are provided in Table RA-7 and in Table RA-8.
Table RA-7 -- City of Fort Collins
Rainfall Intensity -Duration -Frequency Table
for Use with the Rational Method
(5 minutes to 30 minutes)
Duration
(min)
5
2-Year
Intensity
(in/hr)
2.85
10-Year
Intensity
(in/hr)
4.87
100-Year
Intensity
(in/hr)
9.95
6
2.67
4.56
9.31
7
2.52
4.31
8.8
8
2.4
4.1
8.38
9
2.3
3.93
8.03
10
2.21
3.78
7.72
11
2.13
3.63
7.42
12
2.05
3.5
7.16
13
1.98
3.39
6.92
14
1.92
3.29
6.71
15
1.87
3.19
6.52
16
1.81
3.08
6.3
17
1.75
2.99
6.1
18
1.7
2.9
5.92
19
1.65
2.82
5.75
20
1.61
2.74
5.6
21
1.56
2.67
5.46
22
1.53
2.61
5.32
23
1.49
2.55
5.2
24
1.46
2.49
5.09
25
1.43
2.44
4.98
26
1.4
2.39
4.87
27
1.37
2.34
4.78
28
1.34
2.29
4.69
29
1.32
2.25
4.6
30
1.3
2.21
4.52
10
Perception Design Group, Inc.
6901 South Pierce Street,Suite 350
Littleton, Colorado 80128 DATE 28-Dec-16
(303) 232-8088 Fax (303) 232-5255 JOB # 2015-014
Project: Ft Collins Emergency Room
COMPOSITE RUNOFF COEFFICIENTS
BASIN
Area (Ac.)
C
Area (Ac.)
C
Area (Ac.)
C
Composite C
Frequency Factor
Adjusted C
A (2-Year)
0.00
0.95
0.14
0.95
0.02
0.25
0.86
1.00
0.86
A (100-Year)
0.00
0.95
0.14
0.95
0.02
0.25
0.86
1.25
1.00
B (2-Year)
0.20
0.95
0.26
0.95
0.22
0.25
0.72
1.00
0.72
B (100-Year)
0.20
0.95
0.26
0.95
0.22
0.25
0.72
1.25
0.90
C (2-Year)
0.00
0.95
0.04
0.95
0.00
0.25
0.95
1.00
0.95
C (100-Year)
0.00
0.95
0.04
0.95
0.00
0.25
0.95
1.25
1.00
D (2-Year)
0.00
0.95
0.00
0.95
0.15
0.25
0.26
1.00
0.25
D (100-Year)
0.00
0.95
0.00
0.95
0.15
0.25
0.25
1.25
0.31
E (2-Year)
0.02
0.95
0.06
0.95
0.04
0.25
0.72
1.00
0.72
E (100-Year)
0.02
0.95
0.06
0.95
0.04
0.25
0.72
1.25
0.90
B+C (2-Year)
0.20
0.95
1 0.30
0.95
0.22
0.25
0.74
1.00
0.74
B+C (100-Year)
0.20
0.95
1 0.30
0.95
0.22
0.25
0.74
1.25
0.92
Historic A (2-Year)
0.00
0.95
0.10
0.95
0.06
0.25
0.69
1.00
0.69
Historic A (100-Year)
0.00
0.95
0.10
0.95
0.06
0.25
0.69
1.25
0.86
DETENTION BASIN IMPERVIOUSNESS CALCULATIONS
Rl1nF 0A%=U9IJT eunsceowr_
BASIN
Area (Ac.)
Imp
Area (Ac.)
Imp
Area (Ac.)
Imp
Imperviousness
B
0.20
0.26
0.22
C
0.00
0.04
0.00
Total
0.20
90.00%
0.30
100.00%
0.22
2.00%
48.61%
C Values for the 100 year storm are calculated using adjustment factors located in table RO-12
2.10 Runoff Coefficieni Adiustment for Infrequent Storms
The runoff coefficients provided in tables RO-10 and RO-11 are appropriate for use with
the 2-year storm event. For storms with higher intensities, an adjustment of the runoff
coefficient is required due to the lessening amount of infiltration, depression retention,
•evapo-transpiration and other losses that have a proportionally smaller effect on storm
runoff. This adjustment is applied to the composite runoff coefficient.
These frequency adjustment factors are found in Table RO-12
Table RO-12
Rational -Method Runoff Coefficients for Composite Analysis
Storm Return Period Frequency Factor
ears Cr .
2 to 10 1.00
11 to 25 1.10
26 to 50 1.20
51 to 100 1.25
Note: The product of C times Cr cannot exceed the value of 1, in the cases where it does a value of
1 must be used
(6) Section 3.1 is deleted in its entirety.
(7) Section 3.2 is deleted in its entirety.
(S) Section 3.3 is deleted in its entirety.
(9) A new Section 4.3 is added, to read as follows:
4.3 Computer Modeling Practices
(a) For circumstances requiring computer modeling, the design storm hydrographs must
be determined using the Stormwater Management Model (SWMM). Basin and
conveyance element parameters must be computed based on the physical characteristics
of the site.
(b) Refer to the SWMM Users' Manual for appropriate modeling methodology, practices
and development. The Users' Manual can be found on the Environmental Protection
Agency (EPA) website (hg2://www.epa.pov/ednnnnrl/models/swmm/index.htm).
(c) It is the responsibility of the design engineer to verify that all of the models used in
the design meet all current City criteria and regulations.
4.3.1 Surface Storage, Resistance Factors, and Infiltration
Table RO-13 provides values for surface storage for pervious and impervious surfaces
and the infiltration rates to be used with SWMM. Table RO-13 also lists the appropriate
infiltration decay rate, zero detention depth and resistance factors, or Manning's 'W'
values, for pervious and impervious surfaces to be used for SWMM modeling in the city
of Fort Collins.
42
Perception Design Group, Inc.
6901 South Pierce Street,Suite 350
Littleton, Colorado 80128
(303) 232-8088 Fax (303) 232-5255
Project: Ft Collins Emergency Room
RUNOFF CALCULATIONS
(STANDARD FORM SF-3)
DATE 28-Dec-16
JOB # 2015-014
Design Storm: 2-Yr.
Direct Runoff
Design
Basin
Area
Runoff
CA
Tc
I
Q
Point
Desig.
(Acres)
Coefficient
(min)
(inthr)
(cfs)
Developed Site
A
0.16
0.86
0.14
5.0
2.85
0.39
B
0.68
0.72
0.49
5.0
2.85
1.40
C
0.04
0.95
0.04
5.0
2.85
0.11
D
0.15
0.25
0.04
5.0
2.85
0.11
E
0.12
0.72
0.09
5.0
2.85
0.25
Historic Site
Area Tributary to
Detention Pond
B and C
0.72
0.25
0.18
5.0
2.85
0.51
A
0.16
0.69
0.11
5.0
2.85
0.31
D
0.15
0.25
0.04
5.0
2.85
0.11
E
0.12
0.25
0.03
5.0
2.85
0.09
C
Perception Design Group, Inc.
6901 South Pierce Street,Suite 350
Littleton, Colorado 80128
(303) 232-8088 Fax (303) 232-5255
DATE 28-Dec-16
JOB # 2015-014
Project: Ft Collins Emergency Room
RUNOFF CALCULATIONS
(STANDARD FORM SF-31 r)esinn Stnrm, 100-Yr.
Direct Runoff
Design
Basin
Area
Runoff
CA
Tc
I
Q
Point
Desig.
(Acres)
Coefficient
(min)
(in/hr)
(cfs)
A
0.16
1.00
0.16
5.0
9.95
1.59
B
0.68
0.90
0.61
5.0
9.95
6.09
C
1 0.04
1 1.00
1 0.04
1 5.0
1 9.95
0.40
D
0.15
0.31
0.05
5.0
9.95
0.46
E
0.12
0.90
0.11
5.0
9.95
1.07
Historic Runoff
A
0.16
0.86
0.14
5.0
9.95
1.37
B
0.68
0.31
0.21
5.0
9.95
2.10
C
0.04
0.31
0.01
5.0
9.95
0.12
D
0.15
0.31
0.05
5.0
9.95
0.46
E
0.12
0.31
0.04
5.0
9.95
0.37
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
B - DETENTION I WATER QUALITY DESIGN
0
r
Design Procedure Form: Sand Filter (SF)
Sheet 1 of 2
Designer. Jerry Davidson
Company: Perceptiopn Design Group
Date: December 27, 2016
Project: Fort Colins Emergency Center
Location: Sand Filter
1. Basin Storage Volume
A) Effective Imperviousness of Tributary Area, I,
I, =
48.6
%
(100 % if all paved and roofed areas upstream of sand filter)
B) Tributary Area's Imperviousness Ratio (i = I,/100)
i =
0.486
C) Water Quality Capture Volume (WQCV) Based on 24-hour Drain Time
WQCV =
0.18
watershed inches
WQCV= 0.9' (0.91' i3-1.19 • iz+ 0.78 • i)
D) Contributing Watershed Area (in4uding sand filter area)
Area =
31,333
sq ft
E) Water Quality Capture Volume (WQCV) Design Volume
Vw0cv =
476
cu It
Vwccv = WQCV / 12 ' Area
F) For Watersheds Outside of the Denver Region, Depth of
do =
in
Average Runoff Producing Storm
G) For Watersheds Outside of the Denver Region,
Vwocv OTHER =
cu it
Water Quality Capture Volume (WQCV) Design Volume
H) User Input of Water Quality Capture Volume (WQCV) Design Volume
VWOLV USER =
cu It
(Only if a different WQCV Design Volume is desired)
2. Basin Geometry
A)WQCV Depth
Dwocv=
0.3
it
B) Sand Fitter Side Slopes (Horizontal distance per unit vertical,
Z =
4.00
ft / tt
4:1 or flatter preferred). Use "0" if sand fitter has vertical walls.
C) Minimum Fitter Area (Flat Surface Area)
Ate, =
U06
sq ft
D) Actual Fitter Area
Ae =
1194
sq If
E) Volume Provided
VT =
476
cu If
3. Filter Material
Choose One
• 18" 4)(7r Gass C Filter Material
O Omer (Explain):
4. Untlerdrain System
r Choose11 YES
A) Are untlerdrains provided?
O
NO
B) Underdrain system orifice diameter for 12 hour drain time
i) Distance From Lowest Elevation of the Storage
y =
it
Volume to the Center of the Orifice
ii) Volume to Drain in 12 Hours
Vol, =
cu it
iii) Orifice Diameter. 3/8" Minimum
Dc =
in
Sand Filter, SF 12/2712016, 3:41 PM
Design Procedure Form: Sand Filter (SF)
St,,M 2 of 2
Designer. Jerry Davidson
Company: Perceptiopn Design Group
Date: December 27, 2016
Project: Fort Colins Emergency Center
Location: Sand Filter
5. Impermeable Geomembrane Liner and Geotextile Separator Fabric
j Choose One
I O YES O NO
A) Is an impermeable liner provided due to proximity,
of structures or groundwater contamination?
31
�I
6-7. Inlet / Outlet Works
s; A) Describe the type of energy dissipation at inlet points and means of
conveying flours in excess of the WDCV through the outlet
11
Y
Notes:
C_
ICr
Sand Filter. SF
12/27/2016, 3:41 PM
Equations:
Qo
= CiA
V;
= T*CiA = T*Qo
V.
=m*QPo*(60*T)
S=V;-V.
Rainfall intensity from Larimer County Area I IDF Curve
A trib. To pond =
0.72 acre
C100 =
0.92
Developed C*A =
0.66 acre
QPo =
0.51 cfs
tc =
5 min
Storm
Duration, T
(min)
Rainfall
Intensity, i
(in/hr)
Qo
(efs)
Vol. in
V;
(ft3)
Outflow
Adjustment
Factor, m
Vol. Out
V.
(ft)
Storage
S
(ft)
Storage
S
(ac-ft)
5
9.95
6.6
1977
1.00
153
1824
0.042
10
7.72
5.1
3068
0.75
230
2839
0.065
20
1 5.60
3.7
4451
0.63
383
4069
0.093
30
4.52
3.0
5389
0.58
536
4854
0.111
40
3.74
2.5
5946
0.56
689
5257
0.121
50
3.23
2.1
6419
0.55
842
5577
0.128
60
2.86
1.9
6820
0.54
995
5826
0.134
70
2.62
1.7
7289
0.54
1148
6142
0.141
80
2.38
1.6
7567
0.53
1301
6267
0.144
90
2.22
1.5
7941
0.53
1454
6487
0.149
100
2.05
1.4
8148
0.53
1607
6541
0.150
110
1.93
1.3
8438
0.52
1760
6678
0.153
120
1.80
1.2
8585
0.52
1913
6672
0.153
130
1.60
1.1
8267
0.52
2066
6201
0.142
140
1.40
0.9
7790
0.52
2219
5571
0.128
150
1.20
0.8
7154
0.52
2372
4782
0.110
160
1.15
0.8
7313
0.52
2525
4788
0.110
170
1.10
0.7
7432
0.51
2678
4755
0.109
180
1.05
0.7
7512
0.51
2831
4681
0.107
Required Storage Volume: 6678 ft3
0.153 acre-ft
Perception Design Group, Inc.
6901 South Pierce Street,Suite 350
Littleton, Colorado 80128
DATE
31-Jul-16
(303) 232-8088 Fax (303) 232-5255
JOB #
2015-014
Project: Ft Collins Emergency Room
DETENTION POND VOLUME
Storage Range Area 1
Area2
D Vol
Cum Vol
Water
(Ft) (SF)
(SF)
(Ft) (CF)
(CF)
Surface
97.6 0
1194
0.00 0
0
97.60
97.6-98 1194
2697
0.40 758
758
98.00
98-99 2697
4492
1.00 3557
4315
99.00
99-99.8 4492
5637
0.80 4043
8358
99.80
Required Water Quality Volume
476
cf
Water Quality Elevation
97.85
ft
Required 2 Year Volume
88
cf
Required
2 Year + Water Quality Volume
564
cf
2 Year + Water Quality Elevation
97.90
ft
Required 100 Year Volume
6,678
cf
Required 100 Year + Water Quality Volume
7,154
cf
Perception Design Group, Inc.
6901 South Pierce Street,Suite 350
Littleton, Colorado 80128
(303) 232-8088 Fax (303) 232-5255
Project: Ft Collins Emergency Room
ROUND ORIFICE SIZING
100 YEAR
Invert Elevation
4995.25
Ponding Elevation
4999.80
Allowable Discharge
0.51
Coefficient of Discharge
0.65
O=CdxAox(2xgxh)"0.5
Orifice Diam (in.) Orifice Area (sf) Head (ft) Discharge (cfs)
2.875 0.05 4.43 0.495
DATE 6-Oct-16
JOB # 2015-014
Overflow Weir Calculations
Fort Collins Emergency Center
100-year flow into detention pond is from basins B and C
Flow = 6.49 cfs
Size Weir for 2 times the 100-year flow = 12.98 cfs
wY...Wow11�.VLV' D... Yara. e•.•a Y.uul .•.•inl ••.��
Folmulaa;
MIUTDAA INT@RMEMTi CALM oul►ur.
S W. Pn , Ilmh wimeW US Caslnlulry Drh., Q
S.W1 US Cuwenr. w.
M7ara,k ABW H s D GlawMolW aCCalaraLaa D 32 17 R s�
1rin N110D' L v D DwnnW CoeMa C 3 087 Dtn, , 1
,o a
Vour mmnsl wes WM,,oa M 081320 am on DmC 28m. 201611612280813-ID
1
TiyaY ypu lW rWNYIp wYL�aNaniv114PLP. PMat. Ull cyan 114%161
Provide Overflow Weir 12 ft wide with 0.5 ft flow depth
Stormwater Detention and Infiltration Design Data Sheet
Stormwater Facility Name: Fort Collins Emergency Center
Facility Location &Jurisdiction: 4858 S. College Ave.
User (Input) Watershed Characteristics
Watershed Slope =
Watershed Length -to -Width Ratio =
-- Watershed Area =
Watershed Imperviousness=
Percentage Hydrologic Soil Group A =
-_ Percentage Hydrologic Soil Group 8 =
Percentage Hydrologic Soil Groups C/D =1
0.022
ft/ft
L:W
acre
pert
pert
pert
perc
1.00
0.72
48.6%
100.0%
i
User Input: Detention Basin Characteristics
WQCV Design Drain Time = 12.00 hours
After completing and printing this worksheet to a pdf, go to:
https://maperture.digitaldatasemices.com/gvh/?viewer--cswdif,
create a new stormwater facility, and
attach the pdf of this worksheet to that record.
Design Storm Return Period =
Two -Hour Rainfall Depth =
Calculated Runoff Volume =
OPTIONAL Override Runoff Volume =
CInflow
Hydrograph Volume =
Time to Drain 97% of Inflow Volume =
Time to Drain 99% of Inflow Volume =
CMaximum
Ponding Depth =
�—
Maximum Ponded Area =
Maximum Volume Stored =
Routed H dro ra h Results
r rr
�
r rr
r rr
WQCV
2 Year
5 Year
10 Year
25 Year
50 Year
100 Year
0.53
0.98
1.36
1.71
2.31
2.91
3.67
0.010
0.027
0.047
0.066
0.102
0.135
0.181
0.010
0.026
0.047
0.065
0.102
0.134
0.181
3
3
4
4
4
5
6
5
5567
0.36
0.58
0.76
1.07
1.36
1.74
W4
0.059
0.069
0.076
0.090
0.101
0.114
0.016
0.029
0.042
0.069
0.096
0.138
n
icre-ft
acre-ft
acre-ft
lours
iours
t
acres
cre-ft
State Compliance Spreadsheet, Design Data 7/31/2016, 10:41 AM
L_ Stormwater Detention and Infiltration Design Data Sheet
6
100YR IN
---
C—
C
100YR OUT
— 50YR IN
5
-
— SOYR OUT
—25YR IN
— — — 25YR OUT
4
— 10YR IN
/-
— — — lOYR OUT
—SYR IN
3
•••••• SYR OUT
-
—2YR IN
— — — 2YR OUT
2
—WQCVIN
� -
^•••• WQCV OUT
�
1
0
0.1
2
—100YR
1.8
_SOYR
1.6
—25YR
1.4
�10YR
s
_SYR
1.2
_2YR
W
�
2 1
0
Z
6
_WQCV
0.8
0.6
0.4
0.2
.10
0
.
%
0.1
_ _
1 10
TIME [hr]
1 10 100
DRAIN TIME
State Compliance Spreadsheet, Design Data
7/31/2016, 10:41 AM
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FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
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USDA United States
Department of
Agriculture
MRCS
Natural
Resources
Conservation
Service
A product of the National
Cooperative Soil Survey,
a joint effort of the United
States Department of
Agriculture and other
Federal agencies, State
agencies including the
Agricultural Experiment
Stations, and local
participants
Custom Soil Resource
Report for
Larimer County
Area, Colorado
December 20, 2015
Contents
Preface....................................................................................................................2
HowSoil Surveys Are Made..................................................................................5
SoilMap..................................................................................................................7
SoilMap................................................................................................................8
Legend..................................................................................................................9
MapUnit Legend................................................................................................10
MapUnit Descriptions........................................................................................10
Larimer County Area, Colorado......................................................................12
35—Fort Collins loam, 0 to 3 percent slopes..............................................12
74—Nunn clay loam, 1 to 3 percent slopes.................................................13
Soil Information for All Uses...............................................................................15
Soil Properties and Qualities..............................................................................15
Soil Qualities and Features.............................................................................15
HydrologicSoil Group.................................................................................15
References............................................................................................................20
Soil Map
The soil map section includes the soil map for the defined area of interest, a list of soil
map units on the map and extent of each map unit, and cartographic symbols
displayed on the map. Also presented are various metadata about data used to
produce the map, and a description of each soil map unit.
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Custom Soil Resource Report
Map Unit Legend
Larimer County Area, Colorado (CO644)
Map Unit Symbol
Map Unit Name
Acres in AOI
Percent of AOI
35
Fort Collins loam, 0 to 3 percent
slopes
0.6
57.5%
74
Nunn clay loam, 1 to 3 percent
slopes
0.5
42.5%
Totals for Area of Interest
1.1
100.0%
Map Unit Descriptions
r
The map units delineated on the detailed soil maps in a soil survey represent the soils
or miscellaneous areas in the survey area. The map unit descriptions, along with the
maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the landscape,
however, the soils are natural phenomena, and they have the characteristic variability
of all natural phenomena. Thus, the range of some observed properties may extend
beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic
class rarely, if ever, can be mapped without including areas of other taxonomic
classes. Consequently, every map unit is made up of the soils or miscellaneous areas
for which it is named and some minor components that belong to taxonomic classes
other than those of the major soils.
Most minor soils have properties similar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, however, have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, or dissimilar, components. They generally
are in small areas and could not be mapped separately because of the scale used.
Some small areas of strongly contrasting soils or miscellaneous areas are identified
by a special symbol on the maps. If included in the database for a given area, the
contrasting minor components are identified in the map unit descriptions along with
some characteristics of each. A few areas of minor components may not have been
observed, and consequently they are not mentioned in the descriptions, especially
where the pattern was so complex that it was impractical to make enough observations
to identify all the soils and miscellaneous areas on the landscape.
The presence of minor components in a map unit in no way diminishes the usefulness
or accuracy of the data. The objective of mapping is not to delineate pure taxonomic
classes but rather to separate the landscape into landforms or landform segments that
have similar use and management requirements. The delineation of such segments
on the map provides sufficient information for the development of resource plans. If
Ito]
Custom Soil Resource Report
intensive use of small areas is planned, however, onsite investigation is needed to
define and locate the soils and miscellaneous areas.
An identifying symbol precedes the map unit name in the map unit descriptions. Each
description includes general facts about the unit and gives important soil properties
and qualities.
Soils that have profiles that are almost alike make up a soil series. Except for
differences in texture of the surface layer, all the soils of a series have major horizons
that are similar in composition, thickness, and arrangement.
Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity,
degree of erosion, and other characteristics that affect their use. On the basis of such
differences, a soil series is divided into soil phases. Most of the areas shown on the
detailed soil maps are phases of soil series. The name of a soil phase commonly
indicates a feature that affects use or management. For example, Alpha silt loam, 0
to 2 percent slopes, is a phase of the Alpha series.
Some map units are made up of two or more major soils or miscellaneous areas.
These map units are complexes, associations, or undifferentiated groups.
A complex consists of two or more soils or miscellaneous areas in such an intricate
pattern or in such small areas that they cannot be shown separately on the maps. The
pattern and proportion of the soils or miscellaneous areas are somewhat similar in all
areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example.
An association is made up of two or more geographically associated soils or
miscellaneous areas that are shown as one unit on the maps. Because of present or
anticipated uses of the map units in the survey area, it was not considered practical
or necessary to map the soils or miscellaneous areas separately. The pattern and
relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha -
Beta association, 0 to 2 percent slopes, is an example.
An undifferentiated group is made up of two or more soils or miscellaneous areas that
could be mapped individually but are mapped as one unit because similar
interpretations can be made for use and management. The pattern and proportion of
the soils or miscellaneous areas in a mapped area are not uniform. An area can be
made up of only one of the major soils or miscellaneous areas, or it can be made up
of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example.
Some surveys include miscellaneous areas. Such areas have little or no soil material
• and support little or no vegetation. Rock outcrop is an example.
11
Custom Soil Resource Report
Larimer County Area, Colorado
35—Fort Collins loam, 0 to 3 percent slopes
Map Unit Setting
National map unit symbol. 2tlnc
Elevation: 4,020 to 6,730 feet
Mean annual precipitation: 14 to 16 inches
Mean annual air temperature: 46 to 48 degrees F
Frost -free period: 143 to 154 days
Farmland classification: Prime farmland if irrigated
Map Unit Composition
Fort collins and similar soils: 85 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Fort Collins
Setting
Landform: Interfluves
Down -slope shape: Linear
Across -slope shape: Linear
Parent material. Pleistocene or older alluvium derived from igneous, metamorphic
and sedimentary rock and/or eolian deposits
Typical profile
Ap - 0 to 4 inches: loam
Bt1 - 4 to 9 inches: clay loam
Bt2 - 9 to 16 inches: clay loam
Bk1- 16 to 29 inches: loam
Bk2 - 29 to 80 inches: loam
Properties and qualities
Slope: 0 to 3 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: Low
. Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high
(0.20 to 2.00 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum in profile: 12 percent
Salinity, maximum in profile: Nonsaline (0.1 to 1.0 mmhos/cm)
Sodium adsorption ratio, maximum in profile: 0.5
Available water storage in profile: High (about 9.1 inches)
Interpretive groups
Land capability classification (irrigated): 2e
Land capability classification (nonirrigated): 4c
Hydrologic Soil Group: C
Ecological site: Loamy Plains (R067BY002CO)
12
Custom Soil Resource Report
Minor Components
Nunn
Percent of map unit: 10 percent
Landform: Terraces
Landform position (three-dimensional): Tread
Down -slope shape: Linear
Across -slope shape: Linear
Ecological site: Loamy Plains (R067BY002CO)
Vona
Percent of map unit: 5 percent
Landform: Interfluves
Landform position (two-dimensional): Backslope, footslope
Landform position (three-dimensional): Side slope, base slope
Down -slope shape: Linear
Across -slope shape: Linear
Ecological site: Sandy Plains (R067BY024CO)
74—Nunn clay loam, 1 to 3 percent slopes
Map Unit Setting
National map unit symbol: jpxn
Elevation: 4,800 to 5,600 feet
Mean annual precipitation: 13 to 15 inches
Mean annual air temperature: 48 to 50 degrees F
Frost -free period: 135 to 150 days
Farmland classification: Prime farmland if irrigated
Map Unit Composition
Nunn and similar soils: 85 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Nunn
Setting
Landform: Terraces, fans
Landform position (three-dimensional): Base slope, tread
Down -slope shape: Linear
Across -slope shape: Linear
- Parent material: Alluvium
Typical profile
H1 - 0 to 10 inches: clay loam
H2 - 10 to 60 inches: clay loam, clay
H2 - 10 to 60 inches:
Properties and qualities
Slope: 1 to 3 percent
13
Custom Soil Resource Report
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: High
Capacity of the most limiting layer to transmit water (Ksat): Moderately low to
moderately high (0.06 to 0.20 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum in profile: 15 percent
Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm)
Available water storage in profile: Very high (about 18.9 inches)
Interpretive groups
Land capability classification (irrigated): 2e
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: C
Minor Components
Ulm
Percent of map unit: 10 percent
Satanta
Percent of map unit: 5 percent
14
Soil Information for All Uses
Soil Properties and Qualities
The Soil Properties and Qualities section includes various soil properties and qualities
displayed as thematic maps with a summary table for the soil map units in the selected
area of interest. A single value or rating for each map unit is generated by aggregating
the interpretive ratings of individual map unit components. This aggregation process
is defined for each property or quality.
Soil Qualities and Features
Soil qualities are behavior and performance attributes that are not directly measured,
but are inferred from observations of dynamic conditions and from soil properties.
Example soil qualities include natural drainage, and frost action. Soil features are
attributes that are not directly part of the soil. Example soil features include slope and
depth to restrictive layer. These features can greatly impact the use and management
of the soil.
Hydrologic Soil Group
Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned
to one of four groups according to the rate of water infiltration when the soils are not
protected by vegetation, are thoroughly wet, and receive precipitation from long -
duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and three
dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly
wet. These consist mainly of deep, well drained to excessively drained sands or
gravelly sands. These soils have a high rate of water transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist
chiefly of moderately deep or deep, moderately well drained or well drained soils that
have moderately fine texture to moderately coarse texture. These soils have a
moderate rate of water transmission.
15
Custom Soil Resource Report
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or soils
of moderately fine texture or fine texture. These soils have a slow rate of water
transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential,
soils that have a high water table, soils that have a claypan or clay layer at or near the
surface, and soils that are shallow over nearly impervious material. These soils have
a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for
drained areas and the second is for undrained areas. Only the soils that in their natural
condition are in group D are assigned to dual classes.
16
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Custom Soil Resource Report
Table —Hydrologic Soil Group
Hydrologic Soil Group— Summary by Map Unit — Larimer County Area, Colorado (CO644)
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
35
Fort Collins loam, 0 to 3
percent slopes
C
0.6
57.5%
74
Nunn clay loam, 1 to 3
percent slopes
C
0.5
42.5%
Totals for Area of Interest
1.1
100.0%
Rating Options —Hydrologic Soil Group
Aggregation Method: Dominant Condition
Component Percent Cutoff.- None Specified
Tie -break Rule: Higher
19
References
American Association of State Highway and Transportation Officials (AASHTO). 2004.
Standard specifications for transportation materials and methods of sampling and
testing. 24th edition.
American Society for Testing and Materials (ASTM). 2005. Standard classification of
soils for engineering purposes. ASTM Standard D2487-00.
Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of
wetlands and deep -water habitats of the United States. U.S. Fish and Wildlife Service
FWS/OBS-79/31.
Federal Register. July 13, 1994. Changes in hydric soils of the United States.
Federal Register. September 18, 2002. Hydric soils of the United States.
Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils
in the United States.
National Research Council. 1995. Wetlands: Characteristics and boundaries.
Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S.
Department of Agriculture Handbook 18. http://www.nres.usda.govtwps/portal/nres/
detaiVnational/soi Is/?cid=nres 142p2_054262
Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making
and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service,
U.S. Department of Agriculture Handbook436. http://www.nres.usda.gov/wps/portal/
nres/detail/national/soils/?cid=nres 142p2_053577
Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of
Agriculture, Natural Resources Conservation Service. http://www.nres.usda.govtwps/
portal/nres/detai I/national/soils/?cid=nres 142p2_053580
Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and
Delaware Department of Natural Resources and Environmental Control, Wetlands
Section.
United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of
Engineers wetlands delineation manual. Waterways Experiment Station Technical
Report Y-87-1.
United States Department of Agriculture, Natural Resources Conservation Service.
National forestry manual. http://www.nres.usda.govtwps/portal/nres/detaiVsoils/
home/?cid=nres 142p2_053374
United States Department of Agriculture, Natural Resources Conservation Service.
National range and pasture handbook. http://www.nres.usda.gov/Wps/portal/nres/
detail/national/land use/rangepastu re/?cid=stelprdb l 043084
20
Custom Soil Resource Report
United States Department of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 43041. http://www.nres.usda.govtwps/portal/
nres/detail/soi ls/scientists/?cid=nres 142p2_054242
United States Department of Agriculture, Natural Resources Conservation Service.
2006. Land resource regions and major land resource areas of the United States, the
Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296.
http://www. nres.usda.gov/wps/portal/nres/detail/national/soils/?
cid=nres142p2_053624
United States Department of Agriculture, Soil Conservation Service. 1961. Land
capability classification. U.S. Department of Agriculture Handbook 210. http://
www.nrcs.usda.gov/lnternet/FSE—DOCUMENTS/nrcsl42p2—O52290.pdf
21
FORT COLLINS EMERGENCY CENTER
4858 S. COLLEGE AVENUE
FORT COLLINS, COLORADO
D- EXCERPTS FROM ADJACENT STUDIES
�1
i
psorr" T W F nai Approved Repay'
aYe5i5y9 vow-
Iq. Cot
STORM DRAINAGE AND EROSION CONTROL REPORT
FOR
ADVANTAGE RENTAL CENTER
11 � AT
4848 SOUTH COLLEGE AVENUE
' IN
■ THE FOSSIL CREEK BASIN
PREPARED FOR
RONALD ROCKVAM
April 22, 1998
PREPARED BY
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
970/482-9331
his unofficial copy was downloaded on Feb-19-2016 from the City of Fort Collins Public Records Website: http://citvdocs.fegov.com
Dr additional information or an official copy, please contact City of Fort Collins Utilities 700 Wood Street Fort Collins, CO 80524 USA
r
f
1 STEWART&6SSOCIATES 10 �2��RFMM,, FORT TCCOLLINS, CO 80521
Consulting Engineers and Surveyors
By: Pl 7 Date: JL12-eJ TZ Client: r-3O n RD c�r :/a o—+ Sheet No. L2Z of
Project: A✓e
Subject: c' 10 n �'; n l�n �� P �l ->e
Al owleai a eaSc 7::�ot e = 23 c
itn a X v- e- P t ?e : 97.2 - 73 • > = /. 7 S
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is unofficial copy was downloaded on Feb-19-2016 from the City of Fort Collins Public Records Website: http://citvdoes.fegov.corn
or additional information or an official copv, please contact Citv of Fort Collins Utilities 700 Wood Street Fort Collins, CO 80524 USA
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DRAINAGE REPORT
STATE FARM SERVICE CENTER ADDITION
4900 SOUTH COLLEGE AVENUE
FORT COLLINS, COLORADO
AUGUST 1990
Prepared for
State Farm Insurance Company
One State Farm Plaza
Bloomington, Illinois 61710-0001
`0%"11I I I I Ili I t/q. ,.
o.
g-7q -1v
Prepared by
ARI% Corporation
800 8th Avenue
Greeley, Colorado 80631
Project No. 89173.00
Phis unofficial copy was downloaded on Feb-19-2016 from the City of Fort Collins Public Records Website: Imp //citydocs fcgovcom
:or additional information or an official copy, please contact City of Fort Collins Utilities 700 Wood Street Fort Collins, CO 80524 USA
R�'FTN a o0049Fd5 10:ill i, oe n 1.4; a PA,:FS - l FF.F. -
M RCDRNRFN,"F.R RF.� i�FDF.F, 1.71R1MF.R "NINTv i !� s'. ATF. n, l,' FFS -
Do'_ and
DEDICAT:t.N OF ,i1i'� �'�`•
PERMANENT DRAINACF EASrITENT
Conatructmn Division
Tnls Dedic t1911 of Pe ne t 0ralnag• Easement is made, of Lett ive
an of th6 U'day of !J90, by and between State Farm
Mutual Automobile Insurance Company, One State Farm Plaza,
B100aington, :111nois 61710, and the City of Fort Collins,
Colorado.
w I T N E S S E T H
WHEREAS State Farm Mutual Automobile Tneuranca Company Ss the legal
owner of the real property situated in Larlrer County Colorado
described as follows,
Lots 17 through 28 replat of a part of
Fairway Estates to the City of Fort
Collins, Larlmer County, Col:7ado more
particularly described in Exhibit A
attached hereto.
fly 011
$ On
wurocae e._.t rtr_ uC_L'_r ....___..1. _-tu:anca ^amps'.y 1A
constructing facilities on the lend id,ntlfled above for conveyance
and etorags of storm drainage water to meet the current storm
drainage requirements of the City of Fort Collins. ,
NOW, THRREFORS in order to protect the said storm drainage
facilities and an consideration for securing required permits
pertaining to this construction project, State Farm Mutual i
Automobile Insurance Co=;any dedicates the property described in
Exhibit A as a permanent drainage easement and places the following N rastrictlona on the use of said property by ..oats Farm Mutual
Automobile Insurance Company, its successors r:n assigns,
-
1. They shall not build or construct ar Place
:;'•
anything on any portion of the atm anent except
as shown on the approved eonatru:ticn plans
for the Service Center Addition ,tatrc August
1990 or as hereafter permittedi
2. They shall be responsible for keeping the
easement clear of all weeds, high grass,
and volunteer trees or busheai
1�.
3. They may plant and grow flowers or place
v,
picnic tables or play equipment within the
area of the storm water detention p^.n.d■ as
long as the drainage Paths into and out of
the Ponds are not obstructed.
his unotlicial copy was downloaded on Feb-19-2016 from the City of Fort Collins Public Records Website: http://citydocs.fegov.com
or additional information or an official copy, please contact City of Fort Collins Utilities 700 Wood Street Fort Collins, CO 80524 USA
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For additional information or an official copy, please contact City of Fort Collins Utilities 700 Wood Street Fort Collins, CO 80524 USA
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IN WITNESS HEREOF, Stare Farm Hutual Automobile Insurance has Company
Eeu and notarised this Dedication Lf Permanent Dralr.ag,
Easement.
Nem j
John F. Herria _ Aai L rice President
71[le
29 � quo
Date
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LEGAL DESCRIPTION
A portion of Lots 17 through 28 Replat of a Part of Fairway Estates
to the City of Fort Collins, Larimer Countv, Colorado, being more
' Particularly described as follows,
All of said Lots 17, Is, li, 20 and the northerlv 22.5 feet of said
Lot 21; also the easterly 84 feet of said Lots 11 through 28.
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