HomeMy WebLinkAboutDrainage Reports - 06/25/2014 (2)Overall Development Plan (ODP)
City of Ft. Collin A r)proved Puns Drainage Report
Approved By &�
Date 4 s-1 f o r
Harmony and 1-25
June 11, 2014
TST. INC. CONSULTING ENGINEERS
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TST
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760 Whalers Way
Bldg C, Suite 200
Fort Collins, CO 80525
970.226.0557 main
303.595.9103 metro
970.226.0204 fax
ideas@tstinc.com
www.tstinc.com
TST, INC. CONSULTING ENGINEERS
June 11, 2014
Mr. Mark Kempton, P.E., CFM
City of Fort Collins Utilities
700 Wood Street
Fort Collins, CO 80521
Re: Overall Development Plan (ODP) for Harmony and 1-25
Project No. 993.0002.00
Dear Mr. Kempton:
We are pleased to resubmit this ODP Drainage Report for the Harmony and 1-25
project. This report addresses comments from May 23, 2014, and has been
prepared based on the City of Fort Collins Stormwater Criteria Manual and
complies with the ODP submittal requirements for a drainage report.
Respectfully,
TST, INC. CONSULTING ENGINEERS
�i 40
Heather McDowell, P.E.
HEM/jrm
Eric M. Fuhrman, P.E.
Harmony and I-25 ODP Drainage Report
TABLE OF CONTENTS
1.0 Introduction
Page
1.1 Scope and Purpose.....................................................................................................1
1.2 Project Location and Description.................................................................................1
1.3 Previous Studies.........................................................................................................3
1.4 Limitations of Future Projections.................................................................................3
2.0 Historic/Existing Conditions.........................................................................................3
3.0 Developed Conditions Plan
3.1 Design Criteria.............................................................................................................7
3.2 Low Impact Development............................................................................................8
3.3 Floodplain Management..............................................................................................8
4.0 Conclusion.......................................................................................................................10
5.0 References.......................................................................................................................10
Figures
Figure1. Vicinity Map...................................................................................................................2
Figure 2. Gravel Pit Information....................................................................................................4
Figure 3.Outfall to the Poudre River............................................................................................6
Appendices
Appendix: ODP Calculations and Supporting Information
TST. INC. CONSULTING ENGINEERS
L�
Harmony and I-25 ODP Drainage Report
1.0 Introduction
1.1 Scope and Purpose
This report has been developed in accordance with the City of Fort Collins Stormwater Criteria
Manual requirements and complies with City Overall Development Plan (ODP) submittal
requirements. This report presents the results of an ODP level drainage analysis for the first
phase of the ODP at the Harmony and 1-25 project.
1.2 Project Location and Description
The Harmony and 1-25 development is a 266-acre site located at the southwest quadrant of
Harmony Road and Interstate 25 in the west half of Section 3, Township 6 North, Range 68
West. The site is generally bounded by the following roadways: Strauss Cabin Road on the
west, Harmony Road on the north, 1-25 on the east and Kechter Road on the south.
Surrounding properties include: the Arapaho Bend Natural Area and the Harmony Road
Transportation Transfer Center on the north side of Harmony Road, Island Lake Marina and the
Eagle View Natural Area on the south side of Kechter Road, the Chandler property west of
Strauss Cabin Road, the Mountain Life Church and the Budurus properties located along
Strauss Cabin Road further to the south. East of the property is the interstate and the Town of
Timnath.
The ODP boundary for this overall development includes the Harmony Gardens parcels but
does not include the existing Shell gas station parcel at the northeast comer of the site. This
development site was annexed into the City of Fort Collins in 2009 under what was called the
"Riverwalk Annexation".
The Fossil Creek Reservoir Inlet Ditch (FCRID) and the Boxelder Ditch are located along the
western side of the site with the FCRID being further to the west. The FCRID basically creates
the western property boundary south of Rock Creek Drive. The Boxelder Ditch bisects the
Chandler property, crosses Strauss Cabin Road and enters this site approximately 1700' south
of Harmony Road.
This development is located within the Cache la Poudre watershed and City of Fort Collins
Poudre River drainage basin. This project site sits within the FEMA regulated floodway and
floodplain, per FEMA FIRM Maps 08069CO994F & 08069C1013F, dated December 19, 2006.
The floodplain and floodways lines are shown in Figure 1 on the next page.
This Overall Development Plan (ODP) drainage report analysis is limited to 60 acres of the
northwest portion of the property that is outside of the half -foot floodway line (west of the half -
foot floodway line) and north of the half section line, shown as the "Limits of Development" on
•
the ODP plan. The reason for this is because new land development is prohibited within the
•
floodway (unless it can be proven to cause no -rise) and this ODP is not proposing to make any
adjustments or changes to the location of the floodway at this time. In addition, there are no
land uses within the ODP boundary shown below the half section line (126 acres of the overall
site) because of the proposed zoning south of the half section line. That zoning is proposed to
• TST. INC. CONSULTING ENGINEERS
Page 1
Harmony and I-25
ODP Drainage Report
be RUL "Rural Lands". This development project is proposing a mix of primary and secondary
uses allowed in the Harmony Corridor zoning district only. Potential uses are convenience
shopping, restaurants, and offices. Since only the north half (140 acres) is currently zoned for
development, only that portion was analyzed with this ODP drainage report.
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Figure 1. Vicinity Map
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Harmony and I-25 ODP Drainage Report
1.3 Previous Studies
• North 1-25 EIS, August 2011
• Poudre River Drainage Basin Master Plan
1.4 Limitations of Future Projections
The analysis contained in this study is based upon the Limits of Development for the Overall
Development Plan. It is important to note that details regarding type, configuration, and location
of stormwater improvements will be provided in subsequent steps of the entitlement for this
project-
2.0 Historic/Existing Conditions
Historically and prior to the 1980's, this area was grasslands and utilized for farming. Since the
early 1980's, this property had been mined for gravel. Starting in 1981, the Stute Pit (located
within the Harmony Gardens parcel) was mined for sand and gravel for the construction
industry. Subsequently in the later 1980's and into the 1990's, the Weitzel Pits and then the
Wellington Downs Pit were also mined for sand and gravel. With the exception of the Harmony
Gardens parcel and the constructed pad site at the Harmony Road and Strauss Cabin
intersection, a great majority of this property was mined for gravel. See Figure 2 for gravel pit
locations and information.
Today, the Stute Pit is a lined and state certified reservoir. This reservoir provides irrigation
water for the Harmony Gardens tree nursery. The Wellington Downs Pit is also a lined and state
certified reservoir.
The Weitzel Pits are simply inactive gravel mine pits that have become ponds due to the
watertable elevation in the area. The west pit (denoted as #1), the largest of the Weitzel Pits,
has top of bank elevations that vary from 4838 to 4849 (NAVD 1988), and a varying bottom of
pit elevation, with the lowest approximate elevation at 4823. The water surface in this pit is at an
approximate 4838 elevation, resulting in a maximum water depth of 15'. The other two Weitzel
is Pits, denoted as #2 and #3 are configured similarly and also have a similar water depth.
• TST, INC. CONSULTING ENGINEERS
•
Page 3
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Harmony and I-25 ODP Drainage Report
2.
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Figure 2. Gravel Pit Information
Harmony and I-25 ODP Drainage Report
The constructed pad site at the Harmony Road and Strauss Cabin Road intersection is
approximately 13 acres in size. This area was filled and a portion of this area is included in a
LOMR-F. Note that a portion of the filled area is located within the 0.5' floodway and will be
required to be removed as a part of this project. The fill is to be removed to pre -fill elevations
and certified.
According to the Natural Resources Conservation Service (NRCS) the project site is
• characterized by Type B and C soils. Existing slopes within the northernmost 13 acres are
basically flat, and the bank slopes into the existing gravel pits/ponds vary from 3:1 to 4:1. The
NRCS soils data for this site can be found in the Appendix.
Because of the past mining activities on the site, the historic drainage patterns have been modified
somewhat because the old gravel pits now act as large retention basins for stormwater. Weitzel Pit
#2 has a top of bank elevation at 4936 in the southeastern finger and this is where this pond
would overtop and spill south into an adjacent drainage way in a significant storm event. The
water surface elevation in this pond has been observed to be somewhat below the top of bank
elevation. The drainage way that originates at the south finger of #2 follows the east property
boundary between the interstate and the Wellington Downs pit. The drainage way outlets into
two culverts under Kechter Road and this is assumed to be the historic stormwater release
location for this site. Please refer to Figure 3 for the outfall route to the Poudre River.
Historic stormwater runoff rates from this site have been calculated based upon the site as it
was prior to mining activities.
TST. INC. CONSULTING ENGINEERS
Page 5
Harmony and I-25
LIMITS OF
DEVELOPMENT
FOR THE ODP
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Figure 3. Outfall to the Poudre River
Harmony and I-25 ODP Drainage Report
3.0 Developed Conditions Plan
3.1 Design Criteria
The overall drainage plan presented in this report has been developed in accordance with the
City of Fort Collins Stormwater Criteria Manual and the City of Fort Collins submittal
requirements for an ODP. The drainage plan presented is based upon the allowable developed
stormwater release rates prescribed for the Poudre River drainage basin, that being the 2-year
• historic rate; and an integrated stormwater management program that will incorporate "Low
Impact Development" (LID) principals into the design.
The purpose of this developed condition analysis is basically to establish the maximum runoff
• rates from the "Limits of Development' within the ODP and to determine the 100-year detention
volume required. The existing Weitzel Pits, now groundwater fed ponds, will be utilized as
detention and water quality basins for stormwater runoff from this site. Specifically, the ponds
shown as Ponds #1 and #2 in Figure 2, or as the area shown as the detention basin on the
Grading and Drainage Plan, is the planned area for detention.
Developed runoff analysis for the ODP is based on runoff coefficients for zoning classifications.
For this project, the zoning classification is H-C (Harmony Corridor), and the minor stone runoff
coefficient is 0.95, and 1.0 for the major storm.
As the existing Weitzel Ponds #1 & #2 intercept drainage from the north %, the existing
condition (pre mining) for the north '/z of the overall site (the HC zoned area — 140 acres) was
analyzed to determine the allowable release rate from the ODP site. The 2-yr discharge for this
• area was determined to be 0.164 cfs/ac (23.0 cfs / 140 ac). Therefore, the allowable release
from the ODP site is 9.8 cfs (2-yr historic release rate = 60 ac ` 0.164 cfs/ac). The 100-year
release from the undeveloped areas adjacent to the ODP site (east of the Limits of
Development) is 57.2 cfs (100.1 cfs / 140 ac " 80 ac). This amount will be treated as a pass -
through flow. The resulting amount of stormwater passing from the detention basin will be
approximately 67 cfs (9.8 + 57.2). Stormwater release from the detention basin will need to be
provided through a controlled release structure, likely to be a spillway that would need to be
• built below the historic ground surface so as not to fill in or affect the floodway.
In addition, there is an offsite basin to the west of Strauss Cabin Road that currently drains via
the Boxelder Ditch. A conveyance will be provided to this property to convey at least the 2-yr
historic flows (allowed release after development) thru the ODP site. (100-year conveyance of
this flow will be provided if development on that parcel does not occur first.) This flow will be
considered a pass through flow and will be added to the allowed release from the detention
pond.
The required amount of stormwater detention for the full development of the land use parcels in
the "Limits of Development" area is 16.2 ac-ft plus an additional 20% (City criteria), resulting in
19.4 ac-ft. The area of the Weitzel Pond #1 that is outside of the "Limits of Development' and
Weitzel Pond #2 will constitute the detention basin for this project. The approximate water
surface area for these two ponds combined is approximately 18 acres, resulting in
TST. INC. CONSULTING ENGINEERS
Page 7
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Harmony and I-25 ODP Drainage Report
0
approximately 1. 1' of stormwater storage depth above the groundwater elevation. The detention
water surface elevation is still below the Base Flood Elevations as published on the current
FEMA maps.
• Groundwater elevation - 4836 (NAVD 1988)
• 100-yr detention water surface elevation - 4837
Base Flood Elevation (BFE) in this area - 4842
A WQCV calculation has been provided, however, based on conversations with City stormwater
staff, the existing gravel ponds can be used as water quality features for the stormwater
releases from this site. The required WQCV for this site is 2.25 ac-ft. It is assumed that the large
Weitzel ponds will more than account for these requirements.
Stream stability analysis, erosion and sediment control and open water and wetlands mitigation
are beyond the scope of this report and will be addressed separately or in a subsequent PDP
drainage plan.
3.2 Low Impact Development
LID practices are planned to be employed at this site. LID approach to stormwater management
basically aims to mimic the pre -developed stormwater hydrology. Some of the techniques used
to accomplish this are:
• Conserve Existing Amenities by identifying areas of the site that have value and that
should be protected
• Minimize Impacts by preserving natural drainage patterns where possible, reducing
paved areas, increasing stormwater drainage flow path lengths.
• Minimize Directly Connected Impervious Areas (MDCIA) by utilizing green belts and
vegetated areas where possible to slow down storm water travel time and provide
increased filtration and infiltration
Per City criteria, LID techniques are required to be used to treat stormwater runoff for 50% of
any newly added impervious areas and 25% of any newly added pavement areas must be
treated using permeable pavement technology. Grass buffers, rain gardens and permeable
pavements are a few of the LID techniques that may be utilized at this site.
3.3 Floodplain Management
The ODP project site sits within the FEMA regulated floodway and floodplain, per FEMA FIRM
Maps 08069CO994F & 08069C1013F, dated December 19, 2006. More specifically, flood zone
designations within this project site are as follows:
• Flood Zone AE, FLOODWAY AREA: Flood Zone AE is determined to be a Special Flood
Hazard Area subject to inundation by the 1 % annual chance flood. The 1 % annual
chance flood has a 1 % chance of being equaled or exceeded in any given year. Zone
AE is where base flood elevations have been determined. Floodway areas in zone AE
TST. INC. CONSULTING ENGINEERS
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Harmony and I-25
ODP Drainage Report
show the location of the channel of the stream plus any adjacent floodplain areas that
must be kept free of encroachment so that the 1 % annual chance flood can be carried
without substantial increases in flood heights.
Flood Zone AE, 100-YEAR FLOODPLAIN: Flood Zone AE is determined to be a Special
Flood Hazard Area subject to inundation by the 1 % annual chance flood. The 1 % annual
chance flood has a 1 % chance of being equaled or exceeded in any given year. Zone
AE is where base flood elevations have been determined.
Flood Zone X, Shaded: Areas of 0.2% annual chance flood; areas of 1 % annual chance
flood with average depths of less than 1 foot or with drainage areas less than 1 square
mile; and areas protected by levees from 1 % annual chance flood.
Flood Zone X, Unshaded: Areas determined to be outside the 0.2% annual chance
floodplain.
This site is situated outside of any City of Fort Collins regulatory floodways and floodplains.
The "Limits of Development" as shown in the ODP maps are outside of the half -foot floodway.
However, we recognize that a majority of this area still resides within the 100-year floodplain.
Land uses proposed for the "Limits of Development" do not include any critical facilities,
essential service critical facilities, hazardous materials facilities, government services,
residential, or mixed -use. All non-residential structures planned to be built within the "Limits of
Development" will be elevated and flood -proofed 2 feet above the 100-year flood elevations
(shown as Base Flood elevations on the FIRM maps.)
With the eventual development of all areas within the ODP, floodplain modeling is anticipated as
an integral part of the design process for the planning and layout of this site. The design team
for the site understands that a part of standard course for this project, a Conditional Letter of
Map Revision will need to be submitted and approved by the City and FEMA to show how the
flood may eventually be re-routed and channelized through the site so as to allow for additional
building areas to be created within the overall CDP.
There is also a new LOMR (Case # 14-08-0580P) that is currently pending FEMA approval.
Preliminary information from the LOMR was taken into consideration when laying out this ODP.
Upon approval, information on the ODP will be updated to reflect the current effective mapping.
TST. INC. CONSULTING ENGINEERS
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Harmony and I-25 ODP Drainage Report
5.0 Conclusion
The City of Fort Collins and Urban Drainage Stonmwater Criteria Manuals have been used to
establish the criteria for a developed condition runoff plan within the "Limits of Development" for this
ODP. This overall drainage report has provided the general concept for providing stonnwater
routing, collection and detention.
This ODP shows that the "Limits of Development' are outside of the half -foot floodway and that
detention and WQCV requirements can be met within the existing Weitzel Ponds and that the
detention water surface is below the 100-year flood elevations.
6.0 References
City of Fort Collins Stormwater Criteria Manual, Amendments to the Urban Drainage
and Flood Control District Criteria Manual, Adopted December 2011, Last Revision
April 2012.
2. Urban Drainage and Flood Control District Criteria Manual, Volume 3, August 2011
3. Federal Emergency Management Agency, 2006, Flood Insurance Rate Map, Larimer
County, Colorado, Map Number 08069CO994F
4. Federal Emergency Management Agency, 2006, Flood Insurance Rate Map, Larimer
County, Colorado, Map Number 08069C1013F
5. Natural Resources Conservation Services, 2013, Web Soil Survey: Soil Survey Area
Larimer County Area, Version 8, Dec 23, 2013
6. Colorado Division of Reclamation, Mining & Safety website,
hftp://mining.state.co.us/Pa_qes/Home.aspx
7. Chapter 10 of the Fort Collins Municipal Code, http://colocode.com/fcmunihtmi.htmi
8. Pending LOMR, Case #14-08-0580P, Letter of Map Revision (LOMR-BD) Based on
Better Data on the Cache la Poudre River 1-25 Divided Flow Path Southwest of
Harmony Road and Interstate 25, Anderson Consulting Engineers, Effective Date
pending.
TST, INC. CONSULTING ENGINEERS
Page 10
APPENDIX
ODP Calculations
and
Supporting Information
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SUMMARY OF DETENTION PONDS ANALYSIS AND DESIGN
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100 YR. STORM
Q = DEVELOPED SITE RUNOFF
C`Cf=100-YR RUNOFF COEF. =
1.00 Max C•Ct-1.0
I = RAINFALL INTENSITY
A - ONSrCE AREA =
60.0 ac
Q=CCfIA =
60.0 1 cfs Max (" I- 1 n
RELEASE RATE, 2 yr historic =
9.94 cfs
MASS BALANCE METHOD
Tc
(min)
100-YR
RAINFALL
INTENSITY
(in/hr)
DEVELOPEDJ
SITE
RUNOFF
(cfs)
VOL
INTO
POND
(cf)
-
MAX. RELEASE
RATE
(cfs)
- -- -
VOLUME
RELEASE
(cf)
REQUIRED
DETENTION
VOLUME
(ac: ft_)
10
7.72
463.20
277,920
9.84
5,904
6.2
15
6.52
391.20
352,080
9.84
8,856
7.9
20
1 5.60
336.00
403.200
9.84
11,808
9.0
25
4.98
298.90
448,200
9.84
14,760
10.0
30
4.52
271.20
488,160
9.84
17,712
10.8
35
4.08
244.80
514,080
9.84
20,664
11.3
40
3.74
224.40
538,560
9.84
23,616
11.8
45
3.46
207.60
560,520
9.84
26,568
12.3
50
3.23
193.80
581,400
9.84
29,520
12.7
55
3.03
181.80
599,940
9.84
32,472
13.0
60
2.86
171.60
617,760
9.84
35,424
13.4
70
2.60
156.00
655.200
9.84
41,328
14.1
80
2.40
144.00
691.200
9.84
47.232
14.8
90
2.20
132.00
712.800
9.84
53,136
15.1
100
2.05
123.00
738,000
9.84
59,040
15.6
110
1.90
114.00
752,400
9.84
64,944
15.8
120
1.80
108.00
777,600
9.84
70,848
16.2
WATER QUALITY CAPTURE VOLUME (WOCV) Extended Duration (Dry)
% In4xr ious = 95 %
Requited Storagc From FIG 5-1 0.45 "/Ac.
WQCV = (Req. Storage/12)(A)= 2.25 Ac-ft
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Consulting
Engineers
4/29/2014
Fon Colluu Rational Method.als
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Hydrologic Soil Group—Larimer County Area, Colorado
Hydrologic Soil Group
ODP Land Uses Area Only
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
22
Caruso day loam, 0 to 1
C
41.6
58.0%
percent slope
60
Larim gravelly sandy
B
1.4
1.9%
loam, 5 to 40 percent
slopes
64
Loveland day loam, 0 to
C
13.8
19.2%
1 percent slopes
81
Paoli fine sandy loam, 0
B
0.5
0.8%
to 1 percent slopes
101
Stoneham loam, 1 to 3
B
1.4
1.9%
percent slopes
103
Stoneham loam, 5 to 9
B
3.8
5.3%
percent slopes
105
Table Mountain loam, 0
B
9.3
13.0%
to 1 percent slopes
Totals for Area of Interest
71.8
100.0%
LISDA Natural Resources Web Soil Survey 4/27/2014
Conservation Service National Cooperative Soil Survey Page 3 of 4
Hydrologic Soil Group—Larimer County Area, Colorado
Description
ODP Land Uses Area Only
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.
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.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie -break Rule: Higher
uSDA Natural Resources Web Soil Survey 4/27/2014
Conservation Service National Cooperative Soil Survey Page 4 of 4
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MAP NUMBER
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Federal Emergency Management Agency
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or amendments which may have been made subsequent to the date on the
title block For the latest product information about National Flood Insurance
program flood maps check the FEMA Flood Map Store at w .msc.fema. gov