HomeMy WebLinkAboutNE PROSPECT & I-25 ODP - MA210006 - SUBMITTAL DOCUMENTS - ROUND 3 - DRAINAGE REPORT
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April 4, 2021
Fort Collins Utilities
700 Wood Street
Fort Collins, Colorado 80524
RE: PROSPECT/I-25 ODP FIRST AMENDMENT
PROJECT NUMBER: 1489-001
Dear Whomever It Concerns:
This letter report accompanies the submittal for the Rudolph Farms Overall Development Plan (ODP). Specifically,
this letter report serves to document the overall drainage impacts associated with the proposed Rudolph Farms
Development.
The proposed development site is located northeast of the I-25/Prospect Road interchange in Fort Collins,
Colorado. The site is situated along Prospect Road, just east of the I-25/Prospect Road Interchange, and just west
of the Poudre School District Middle/High School development. The overall Rudolph Farms site is roughly 116
acres in size.
Zoning across the site includes Industrial (I), Commercial (C), and Urban Estate (UE). The east I -25 Frontage Road
access, from Prospect Road to the northwest corner of the development, will be abandoned as part of the
Colorado Department of Transportation North I-25 Express Lanes improvement project. The vacated right-of-way
for the east I-25 Frontage Road access is to be included as part of this Overall Development Plan. The extens ion of
Carriage Parkway from Fox Groves to Prospect Road is proposed as part of this project.
Release Rate:
A release rate for the project site was not determined as part of this Overall Development Plan. A stormwater
release rate for the site will be determined at a future date with input from the City of Fort Collins, Town of
Timnath, and New Cache Reservoir Company. According to the Town of Timnath Master Drainage Plan, TRIC will
overflow at two (2) locations on the project site and three (3) downstream locations. Spill D, just north of
County Road 42E, limits the capacity of TRIC to 190 cfs. As a result of the concerns regarding the capacity of the
TRIC release rates and downstream infrastructure, conceptual detention volumes have not been calculated. An
analysis of downstream infrastructure is not part of this study. Further coordination between the Developer, the
City of Fort Collins, Town of Timnath, and New Cache Reservoir Company will be required to determine a release
rate for this project.
The southeast corner of the site, draining towards an existing 36” culvert to be replaced by Colorado Department
of Transportation as part of the North I-25 Express Lanes improvement project, will be required to release at the 2-
year historic release rate per City of Fort Collins Stormwater Manual. The Colorado Department of Transportation
designed the 36” culvert to pass 34.8 cfs without overtopping.
While volumes for the detention ponds are not provided, it is anticipated there will be multiple detention ponds
on the site. The pond locations and outfalls are described in more detailed below.
Southwest Corner of the Site:
The southwest corner of the proposed development site is in Basin SB-3 of the Town of Timnath Master Drainage
Plan. The outfall for the southwest corner of the site is a proposed 36” culvert underneath Prospect Road. The
culvert will be installed as part of the Colorado Department of Transportation North I-25 Express Lanes
improvement project as a replacement to an existing culvert prior to construction. The existing culvert is shown
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in Figure 1. A detention pond will be constructed upstream of the 36” culvert at the 2-Year Historic Release Rate
per the City of Fort Collins Stormwater Regulations.
Southeast Corner of the Site:
The southeast corner of the proposed development site is in Basin SB-6 of the Town of Timnath Master Drainage
Plan. The historic outfall for the southeast corner is split into TRIC and towards the south. According to the Town
of Timnath, there is no adequate downstream infrastructure south of the site. The project will be required to
Figure 1: Existing culvert prior to CDOT intersection improvements.
Figure 2: Location photograph of existing culvert.
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enter an agreement between the owner and New Cache Reservoir Company to discharge into TRIC for the
southeast corner of the site. If stormwater is released into TRIC, consideration of downstream capacity may need
to be evaluated and considered when determining the ultimate release rate for the southeast corner. Developed
drainage will be routed through water quality and detention ponds prior to release into TRIC.
North Half of the Site:
The north half of the proposed development is in Basins SB-2 and SB-5 of the Town of Timnath Master Drainage
Plan. Per the Town of Timnath Master Drainage Plan, Basins SB-2 and SB-5 drains into TRIC. The development
will be required to provide an agreement between the owner and New Cache Reservoir Company to discharge
developed drainage into TRIC from the north half of the site. If stormwater is to be released into TRIC,
consideration of downstream capacity may need to be evaluated and considered when determining the
allowable release rate for the north half of the site. Developed drainage will be routed through water quality
and detention ponds prior to release into TRIC.
Detention Volume, Water Quality, and LID:
The development will provide multiple onsite detention ponds. The multiple detention ponds will reduce the
need of a single, large regional detention pond, provide additional water quality treatment through a treatment
train, and enhanced landscaping per the City of Fort Collins Stormwater Criteria Manual. Water quality and LID
requirements will be provided with each respective Project Development Plan per the City of Fort Collins
Stormwater Criteria Manual. Detention pond release rates and volumes will be determined at a future date with
input from the City of Fort Collins, Town of Timnath, and New Cache Reservoir Company. As a result, conceptual
detention volumes have not been calculated.
No SWMM modeling has been done at the present. SWMM modeling will be conducted at Project Development
Plan submittal to verify detention volumes and viability of full spectrum detention.
Floodplain:
The far northwest corner of the site is located within the existing Boxelder Creek Flood fring e, floodway and
erosion buffer zone. FEMA FIRM Panel Number 08069C0984H and 08069C1003G for Larimer County, Dated May 2,
2012 (revised February 21, 2019) is referenced in this study. Base (100-year) flood elevations in the vicinity of the
proposed project range from 4919.9 to 4920.7 (elevations referenced to the City of Fort Collins NAVD 88). Please
see the attached FIRMette and City Floodplain Mapping exhibits.
A LOMR was approved by FEMA dated February 20, 2019 (Case No. 17-08-1354P). Improvements include an
overflow channels, box culverts, dams, and bridge replacement. These improvements have removed much of this
property from the flood fringe and floodway. Limits for both the existing FEMA Floodway/Floodplain and the
proposed Floodplain/Floodway are shown on the Master Drainage Plan. These master plans were prepared
utilizing the proposed floodplain/floodway. Most of the development will avoid the effective floodplain/floodway
limits per the LOMR revisions.
It is acknowledged that any improvements located within the Boxelder Creek floodplain and floodway must
satisfy the standards of Chapter 10 of City Code; and final design documents will be completed accordingly. Any
development within the Boxelder Creek floodplain will be required to provide a City of Fort Collins floodplain use
permit prior to construction. Any disturbance to the mapped erosion buffer will require a stability study. Any
development with the Boxelder Creek floodway will be required to provide a City of Fort Collins no-rise
certification prior to construction.
Offsite Flows:
Offsite flows, except those identified as part of the Boxelder Creek floodplain and floodway, are not expected to
impact this site. However, further analysis will be required during Project Development Plan to ensure there are
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no offsite stormwater impacts from Fox Grove, Kitchell Subdivision, and Poudre School District Middle/High
School developments. Offsite flows will be passed through the site without providing any detrimental impact to
the development and downstream users.
In summary, this Overall Drainage Report letter adequately addresses any potential stormwater changes
associated with the proposed Overall Development Plan Amendment. In general, there are no significant changes
proposed at a major drainage level. The ODP complies with the governing City of Fort Collins Master Drainage
Plans, and the previously approved drainage plans specific for the subject property
Sincerely,
NORTHERN ENGINEERING SERVICES, INC.
Frederick S. Wegert, PE
Project Engineer
Attachments: Excerpts from Boxelder 6 CLOMR; FEMA Firmette; City of Fort Collins Flood Risk Map; City of Fort
Collins Stormwater Manual Table 3.2-1; Town of Timnath Master Drainage Plan SWMM Subbasin Map –
Developed Condition; Excerpts from Town of Timnath SWMM Model; Town of Timnath TRIC Spill Map; Sheets 76
and 86 from CDOT North I-25 Express Lanes – Prospect Road – Drainage Plan; Exceprts from CDOT North I-25
Express Lanes Drainage Report
National Flood Hazard Layer FIRMette
0 500 1,000 1,500 2,000250
Feet
Ü
SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT
SPECIAL FLOOD
HAZARD AREAS
Without Base Flood Elevation (BFE)
Zone A, V, A99
With BFE or DepthZone AE, AO, AH, VE, AR
Regulatory Floodway
0.2% Annual Chance Flood Hazard, Areas
of 1% annual chance flood with average
depth less than one foot or with drainage
areas of less than one square mileZone X
Future Conditions 1% Annual
Chance Flood HazardZone X
Area with Reduced Flood Risk due to
Levee. See Notes.Zone X
Area with Flood Risk due to LeveeZone D
NO SCREEN Area of Minimal Flood Hazard Zone X
Area of Undetermined Flood HazardZone D
Channel, Culvert, or Storm Sewer
Levee, Dike, or Floodwall
Cross Sections with 1% Annual Chance
17.5 Water Surface Elevation
Coastal Transect
Coastal Transect Baseline
Profile Baseline
Hydrographic Feature
Base Flood Elevation Line (BFE)
Effective LOMRs
Limit of Study
Jurisdiction Boundary
Digital Data Available
No Digital Data Available
Unmapped
This map complies with FEMA's standards for the use of
digital flood maps if it is not void as described below.
The basemap shown complies with FEMA's basemap
accuracy standards
The flood hazard information is derived directly from the
authoritative NFHL web services provided by FEMA. This map
was exported on 1/25/2021 at 4:16 PM and does not
reflect changes or amendments subsequent to this date and
time. The NFHL and effective information may change or
become superseded by new data over time.
This map image is void if the one or more of the following map
elements do not appear: basemap imagery, flood zone labels,
legend, scale bar, map creation date, community identifiers,
FIRM panel number, and FIRM effective date. Map images for
unmapped and unmodernized areas cannot be used for
regulatory purposes.
Legend
OTHER AREAS OF
FLOOD HAZARD
OTHER AREAS
GENERAL
STRUCTURES
OTHER
FEATURES
MAP PANELS
8
B 20.2
The pin displayed on the map is an approximate
point selected by the user and does not represent
an authoritative property location.
1:6,000
105°0'11"W 40°34'28"N
104°59'34"W 40°34'N
Basemap: USGS National Map: Orthoimagery: Data refreshed October, 2020
INTERSTATE 25E PROSPECT RDSE FRONTAGE RDSW FRONTAGE RDQUEST DR
FOX GROVE DR
OFF RAMPVIXEN DRCARRIAGE PKW YHUNTSMAN DR TOD DRROLLINS DEN DRSMITHFIELD DR KIT DEN DR
INTERSTATE 25Printed: 11/16/2020.
All floodplain boundaries are approximate.
This information is based on the Federal Emergency Management Agency (FEMA) Flood Insurance Rate Map (FIRM) and the City of Fort Collins Master Drainageway Plans. This letter does not imply that the referenced property will or will not be free from flooding or damage. A property not in the Special Flood Hazard Area or in a City Designated Floodplain may be damaged by a flood greater than that predicted on the map or from a local drainage problem not shown on the map. This map does not create liability on the part of the City, or any officer or employee thereof, for any damage that results from reliance on this information.
FEMA Flood Risk Map
Moderate Risk
May include:- Areas of FEMA 500-year floodplain (FEMA Zone X-shaded).- Areas of FEMA or City 100-year floodplain (sheet flow) with average depths of less than 1 foot.- Areas protected by levees from the 100-year flood.Low Risk
Areas outside of FEMA and City mapped 100-year and 500-year floodplains. Local drainage problems may still exist.
FEMA Flood Fringe - May Include:- Areas of FEMA 100-year floodplain (FEMA Zones A, AE, AO, and AH)- Areas of City 100-year floodplain including ponding areas and sheet flow areas with average depths of 1-3 feet.There is a 1% annual chance that these areas will be flooded.
High Risk
FEMA Floodway - Area of 100-year floodplain with greatest depths and fastest velocities.
Erosion Buffer Limits
0 240 480 720 960120
Feet
PROSPECT & I-25 ODP
FORT COLLINS STORMWATER CRITERIA MANUAL Hydrology Standards (Ch. 5)
3.0 Rational Method
3.2 Runoff Coefficients
Page 4
3.2 Runoff Coefficients
Runoff coefficients used for the Rational Method are determined based on either overall land use or
surface type across the drainage area. For Overall Drainage Plan (ODP) submittals, when surface types
may not yet be known, land use shall be used to estimate flow rates and volumes. Table 3.2-1 lists the
runoff coefficients for common types of land uses in the City.
Table 3.2-1. Zoning Classification - Runoff Coefficients
Land Use Runoff Coefficient (C)
Residential
Urban Estate 0.30
Low Density 0.55
Medium Density 0.65
High Density 0.85
Commercial
Commercial 0.85
Industrial 0.95
Undeveloped
Open Lands, Transition 0.20
Greenbelts, Agriculture 0.20
Reference: For further guidance regarding zoning classifications, refer to the Land Use
Code, Article 4.
For a Project Development Plan (PDP) or Final Plan (FP) submittals, runoff coefficients must be based on
the proposed land surface types. Since the actual runoff coefficients may be different from those
specified in Table 3.2-1, Table 3.2-2 lists coefficients for the specific types of land surfaces.
MAIN ST.COUNTY ROAD 5HIGHWAY 14
Downtown Timnath AreaSee Map B-5 MATCHLINE - SEE SHEET B-2TIMNATHRESERVOIR
E C
E MULBERRY ST
E COUNTY ROAD 40E HORSETOOTH RD
E PROSPECT RD
INTERSTATE 25!(SB 1251047 ac.43%
!(SB 1263423 ac.15%
!(SB 2634 ac.66%
!(SB 2733 ac.20%
!(SB 2835 ac.20%
!(SB 3145 ac.25%
!(SB 309 ac.30%!(SB 2537 ac.15%
!(SB 3444 ac.61%
!(SB 432 ac.80%!(SB 732 ac.40%
!(SB 69 ac.90%
!(SB 337 ac.80%!(SB 15A43 ac.55%
!(SB 582 ac.55%
!(SB 237 ac.30%
!(SB 5A33 ac.15%
!(SB 1587 ac.20%
!(SB 1326 ac.38%!(SB 1643 ac.25%
!(SB 3256 ac.20%
!(SB 9143 ac.50%
!(SB 8197 ac.67%
!(SB 4A30 ac.70%
!(SB 1876 ac.51%
!(SB 1136 ac.39%
!(SB 1242 ac.44%
!(SB 10115 ac.55%
!(SB 14103 ac.33%
!(SB 1737 ac.45%
!(SB 2036 ac.40%!(SB 2154 ac.45%
!(SB 50A7 ac.50%
!(SB 506 ac.50%
!(SB 5214 ac.78%
!(SB 5121 ac.78%
!(SB 4884 ac.68%
!(SB 4932 ac.64%
!(SB 3310 ac.29%
!(SB 37117 ac.37%
!(SB 4420 ac.5%
!(SB 43A41 ac.44%!(SB 4656 ac.38%
!(SB 47A23 ac.43%
!(SB 4719 ac.34%!(SB 4566 ac.42%!(SB 7679 ac.35%!(SB 7928 ac.5%
!(SB 7872 ac.5%
!(SB 3948 ac.21%
!(SB 3582 ac.45%
!(SB 77A2 ac.10%!(SB 77B2 ac.10%!(SB 80B1 ac.10%!(SB 80A4 ac.10%
!(SB 808 ac.15%!(SB 72A5 ac.30%
!(SB 7288 ac.32%!(SB 6730 ac.49%
!(SB 6851 ac.36%
!(SB 7117 ac.30%
!(SB 1201225 ac.65%
!(SB 8145 ac.25%
!(SB 8221 ac.30%!(SB 82A16 ac.10%!(SB 82B3 ac.10%
!(SB 81A6 ac.30%
!(SB 77C9 ac.25%!(SB 77D27 ac.30%
!(SB 80D10 ac.10%
!(SB 80C10 ac.10%
!(SB 8449 ac.25%
!(SB 8449 ac.25%!(SB 82C8 ac.10%!(SB 82D109 ac.30%!(SB 7055 ac.50%!(SB 73159 ac.50%
!(SB 2247 ac.20%
!(SB 25A17 ac.10%
!(SB 2421 ac.15%
!(SB 2922 ac.20%
!(SB 267 ac.90%
!(SB 3866 ac.30%
!(SB 9A23 ac.25%
!(SB 21A77 ac.42%
!(SB 43107 ac.22%
!(SB 70A30 ac.67%
Timnath Drainage Master Plan 2018 Update
EXHIBIT B-1 - SWMM Subbasin MapDeveloped Condition - North Map
Legend
SWMM Subbasins Developed Imperv.
0 - 6%
7 - 20%
21 - 35%
36 - 50%
51 - 65%
66 - 80%
81 - 100%
SWMM Subbasin (Name, Area - Ac, % Imp.)
SWMM Routing Link q
600 Feet
File: F:\32-1881.00 Timnath Master Plan Update\GIS\MXD\AppendixMaps\AppB_Future\B-1 - FUT_BasinMap_North.mxd - Plot By: SimpsonM - Date: 8/21/2018
[SUBCATCHMENTS]Name RainGage Outlet Area Exist %Imperv Future Imperviousness Width Flow Length Slope Land Use Conversion2 RG1 53 67.09 2 90 9741 300 1Yes3 RG1 54 36.68 5 80 5326 300 1Yes4 RG1 117 32.45 20 80 4712 300 1Yes5 RG1 129 82.16 2 55 11930 300 1Yes6 RG1 133 8.54 2 90 1240 300 1Yes7 RG1 132 31.57 20 40 4584 300 1Yes8 RG1 134 197.45 5 67 28670 300 1Yes9 RG1 500 142.96 5 50 20758 300 1Yes10 RG1 138 115.38 12 55 16753 300 1Yes11 RG1 142 36.46 2 39 5294 300 1Yes12 RG1 143 41.68 5 44 6052 300 1Yes13 RG1 LAKECANAL2 26.3 20 38 3819 300 1Yes14 RG1 146 102.97 2 33 14951 300 1Yes15 RG1 149 86.87 5 20 12614 300 1Yes16 RG1 LAKECANAL3 42.8 25 25 6235 299 0.44 No17 RG1 153 37.16 2 45 5396 300 1Yes18 RG1 156 76.37 2 51 11089 300 1Yes20 RG1 159 36.41 12 40 5287 300 1Yes21 RG1 162 54.43 12 45 7903 300 1Yes22 RG1 164 47.17 20 20 7110 289 1.8 No23 RG1 165 7.37 30 30 642 500 0.54 No24 RG1 166 21.36 15 15 3101 300 1.86 No25 RG1 P‐25 36.96 15 15 3220 500 0.65 No26 RG1 169 33.5 10 66 4864 300 1Yes27 RG1 170 33.05 20 20 2879 500 0.43 No28 RG1 173 35.06 20 20 3054 500 1.73 No29 RG1 P‐29 22.18 20 20 1932 500 2.48 No30 RG1 177 9.32 5 30 1720 236 1.18Yes31 RG1 P‐31 45.38 25 25 4707 420 2.57 No32 RG1 LAKECANAL4 56.49 20 20 8202 300 0.57 No33 RG1 179 10.33 12 29 1500 300 1Yes34 RG1 180 44.49 10 61 6460 300 1.75Yes35 RG1 182 81.61 5 45 11850 300 1.5Yes37 RG1 187 117.18 5 37 17015 300 1Yes38 RG1 186 66.39 5 30 9640 300 1Yes39 RG1 TRIC6 47.66 5 21 6920 300 3Yes43 RG1 193 107.04 5 22 15542 300 1Yes44 RG1 LAKECANAL8 20.16 5 6 4391 200 5.8Yes45 RG1 199 65.97 2 42 9579 300 1.57Yes46 RG1 201 56.24 12 38 8166 300 1Yes47 RG1 LAKECANAL9 19.4 5 34 2817 300 6.64Yes48 RG1 204 84.49 5 68 12268 300 1Yes49 RG1 207 32.41 12 64 4706 300 1Yes50 RG1 P‐50 5.78 50 50 3187 79 0.72 No51 RG1 213 20.68 10 78 3003 300 1Yes52 RG1 216 14.31 20 78 2078 300 1Yes55 RG1 217 10.68 45 75 1551 300 1Yes57 RG1 DTN4 2.69 80 80 391 300 1Yes58 RG1 DTN6 1.11 50 80 322 150 1.15Yes59 RG1 DTN7 3.22 50 50 712 197 1Yes60 RG1 DTN7 1.38 50 56 707 85 1Yes61 RG1 220 2.51 40 70 547 200 1Yes62 RG1 DTN3 2.53 70 79 841 131 1Yes63 RG1 DTN6 0.91 50 80 551 72 1Yes64 RG1 221 2.17 50 77 722 131 1.56Yes65 RG1 DTN14 1.94 50 80 397 213 1.15YesFutureTable B‐1 ‐ SWMM Subbasin Parameters ‐ Future ConditionExisting ConditionF:\32‐1881.00 Timnath Master Plan Update\Hydrology\EPA SWMM\SWMM_Subbasin_Parameters.xlsx8/21/2018
2‐Yr 5‐Yr 10‐Yr 25‐Yr 50‐Yr 100‐Yr 2‐Yr 5‐Yr 10‐Yr 25‐Yr 50‐Yr 100‐Yr 2‐Yr 5‐Yr 10‐Yr 25‐Yr 50‐Yr 100‐Yr
2 L‐CP‐2 457122858 139206260352463607 234567
3 L‐CP‐3 579142134 70102129176233309 2457810
4 L‐CP‐4 17 24 30 41 55 76 62 91 114 155 204 272 10 15 18 22 27 32
5 L‐CP‐5 579173771 116167210290391534 124679
6 L‐CP‐6 011248 182633466078 011111
7 L‐CP‐7 17 24 30 42 57 81 34 48 60 84 116 162 7 11 14 19 25 32
8 L‐CP‐8 28 39 49 74 116 187 327 476 597 815 1,089 1,466 11 18 24 33 41 49
9 L‐CP‐9 20 29 35 53 83 137 186 267 333 454 613 842 7 12 16 23 30 37
10 L‐CP‐10 38 54 67 92 128 185 163 235 293 396 531 725 18 27 33 44 55 67
11 L‐CP‐11 23461327 38546792126176 112234
12 L‐CP‐12 6810162644 496986117158219 2346811
13 L‐CP‐13 15 21 26 37 53 77 27 38 48 67 93 130 6 10 12 16 21 27
14 L‐CP‐14 6810183878 93132163223309438 1236811
15 L‐CP‐15 12 17 22 34 57 96 49 69 85 123 179 269 2 3 5 12 17 22
16 ‐2941517097138 2941517097138 ‐‐‐‐‐‐
17 L‐CP‐17 23492245 446379107145201 112334
18 L‐CP‐18 468133163 101145181245330452 123568
20 L‐CP‐20 12 17 21 29 42 63 39 56 69 94 128 178 5 8 9 13 17 22
21 L‐CP‐21 18 25 31 43 60 86 65 93 115 156 211 292 6 11 14 19 25 32
22 ‐27384668103160 27384668103160 ‐‐‐‐‐‐
23 ‐5810131825 5810131825 ‐‐‐‐‐‐
24 ‐91316243761 91316243761 ‐‐‐‐‐‐
25 ‐152227375174 152227375174 ‐‐‐‐‐‐
26 L‐CP‐26 9 13 16 23 32 49 55 80 100 135 180 242 6 8 9 12 15 18
27 ‐172531425678 172531425678 ‐‐‐‐‐‐
28 ‐202834476697 202834476697 ‐‐‐‐‐‐
29 ‐121822304365 121822304365 ‐‐‐‐‐‐
30 L‐CP‐30 1224918 81114192740 011223
31 ‐32455680116171 32455680116171 ‐‐‐‐‐‐
32 ‐31445575106155 31445575106155 ‐‐‐‐‐‐
33 L‐CP‐33 35681218 81214202840 112356
34 L‐CP‐34 13 18 23 37 58 93 71 102 129 180 244 332 6 9 12 16 20 24
35 L‐CP‐35 12 16 22 40 70 125 99 141 178 251 346 482 4 7 10 14 18 22
37 L‐CP‐37 17 23 29 42 64 104 117 167 206 281 384 540 5 8 11 17 22 29
38 L‐CP‐38 9 13 16 24 36 59 55 78 96 131 182 261 3 5 6 10 13 17
39 L‐CP‐39 71012224483 29404975117184 1246912
43 L‐CP‐43 15 21 26 41 69 120 66 93 115 160 230 341 3 5 7 14 21 27
44 ‐346214379 346214379 ‐‐‐‐‐‐
45 L‐CP‐45 457204688 76107133185256360 123467
46 L‐CP‐46 19 26 32 45 63 92 58 82 102 140 193 271 6 9 13 19 26 33
47 L‐CP‐47 345163670 1926324770106 112345
48 L‐CP‐48 12 17 21 31 49 80 141 206 258 352 469 631 6 9 11 14 17 21
49 L‐CP‐49 11 15 19 26 37 55 52 75 94 127 169 229 5 8 10 12 15 19
50 ‐81214202942 81214202942 ‐‐‐‐‐‐
51 L‐CP‐51 34581221 38577196127170 223456
52 L‐CP‐52 81114192739 2739496789118 5 6 8101114
55 L‐CP‐55 12 17 21 29 39 53 19 28 36 48 64 85 7 10 12 15 18 22
57 ‐479121621 589131723 ‐‐‐‐‐‐
58 ‐223457 2346810 ‐‐‐‐‐‐
59 ‐468101420 468111420 ‐‐‐‐‐‐
60 ‐2335710 2345811 ‐‐‐‐‐‐
61 L‐CP‐61 3457913 578111520 122345
62 ‐578111520 5810131723 ‐‐‐‐‐‐
63 ‐122357 234579 ‐‐‐‐‐‐
64 L‐CP‐64 34571115 578111520 123345
65 ‐3456912 467101317 ‐‐‐‐‐‐
66 ‐45791217 6810141824 ‐‐‐‐‐‐
67 L‐CP‐67 22351224 38556994127174 111233
68 L‐CP‐68 345112446 507088123170240 112456
69 L‐CP‐69 23471633 72106133180239319 122334
70 L‐CP‐70 34592041 72103129175235323 123456
71 L‐CP‐71 23471529 142025355279 111235
72 L‐CP‐72 57103167124 78111139198282406 1235810
73 L‐CP‐73 9 13 17 32 70 134 207 298 373 515 698 959 4 7 8 11 14 17
74 ‐1825314672116 1825314672116 ‐‐‐‐‐‐
75 ‐2839486895135 2839486895135 ‐‐‐‐‐‐
76 L‐CP‐76 11 16 19 39 84 161 77 109 134 188 265 383 3 5 7 12 15 20
77 ‐33465886129198 33465886129198 ‐‐‐‐‐‐
78 ‐1015184193177 1015184193177 ‐‐‐‐‐‐
79 ‐467142954 467142954 ‐‐‐‐‐‐
80 ‐356111830 356111830 ‐‐‐‐‐‐
81 ‐32445581120180 32445581120180 ‐‐‐‐‐‐
82 ‐1825304568106 1825304568106 ‐‐‐‐‐‐
83 L‐CP‐83 10 14 18 30 52 91 128 187 235 321 427 573 6 8 10 13 16 19
84 ‐35496095160264 35496095160264 ‐‐‐‐‐‐
85 L‐CP‐85 20 28 34 50 77 125 195 282 351 475 637 870 7 12 16 22 28 35
86 ‐557897132181256 557897132181256 ‐‐‐‐‐‐
87 L‐CP‐87 11282039 2028354969100 111122
88 ‐93132163224307432 93132163224307432 ‐‐‐‐‐‐
89 L‐CP‐89 1114919 121721294161 011122
90 L‐CP‐90 345102552 476783113156221 112356
91 L‐CP‐91 23471119 32476081107142 123345
92 L‐CP‐92 81114223867 5884104141187249 35791114
93 L‐CP‐93 6810163471 131188234317426585 2346810
94 L‐CP‐94 467122552 86123153207280388 123568
95 ‐76108133183254361 76108133183254361 ‐‐‐‐‐‐
96 ‐356143160 356143160 ‐‐‐‐‐‐
97 ‐6085104148217325 6085104148217325 ‐‐‐‐‐‐
98 ‐6389110153213304 6389110153213304 ‐‐‐‐‐‐
99 L‐CP‐99 12251020 142025355073 011223
100 L‐CP‐100 6911172847 33465780112163 1226811
101 L‐CP‐101 578153469 99142176239324449 123579
102 L‐CP‐102 6810152441 517390122164226 2346810
103 ‐3043537297134 3043537297134 ‐‐‐‐‐‐
104 ‐86121150206284398 86121150206284398 ‐‐‐‐‐‐
105 ‐31455777103141 31455777103141 ‐‐‐‐‐‐
106 L‐CP‐106 71012193253 30435374103145 23471012
107 ‐6389110152211300 6389110152211300 ‐‐‐‐‐‐
108 L‐CP‐108 578121930 162329405577 122468
109 L‐CP‐109 91215213043 5682102139185247 34691214
110 L‐CP‐110 568121830 476987117156209 234568
112 ‐223479 223479 ‐‐‐‐‐‐
114 ‐568111522 568111522 ‐‐‐‐‐‐
119 ‐589131927 589131927 ‐‐‐‐‐‐
120 ‐1,144 1,796 2,331 3,237 4,328 5,829 1,277 2,049 2,691 3,774 5,073 6,847 ‐ ‐ ‐‐‐‐
121 L‐CP‐121 702 995 1,231 1,700 2,364 3,402 2,216 3,433 4,425 6,109 8,149 10,971 259 431 558 754 974 1,238
122 L‐CP‐122 43 59 73 122 231 465 640 992 1,278 1,765 2,354 3,170 21 30 36 47 59 72
123 L‐CP‐123 40 56 68 114 217 437 552 845 1,082 1,486 1,980 2,668 18 27 33 44 55 68
124 L‐CP‐124 93 130 160 267 506 1,019 1,454 2,265 2,929 4,053 5,411 7,285 36 61 76 103 130 159
125 L‐CP‐125 409 588 731 998 1,354 1,886 880 1,357 1,745 2,406 3,207 4,319 194 298 362 464 579 730
126 L‐CP‐126 935 1,325 1,639 2,263 3,148 4,530 1,336 1,920 2,389 3,261 4,424 6,163 203 337 465 753 1,112 1,641
130 ‐35681217 35681217 ‐‐‐‐‐‐
Future SWMM Model Results ‐ Concept Detention Discharge
Discharge (cfs)Subbasin
Concept
Detention
Outlet Link
Table B‐3 ‐ Subbasin Discharge Results
Existing SWMM Model Results ‐ Subbasin Discharge Future SWMM Model Results ‐ Subbasin Discharge
Discharge (cfs) Discharge (cfs)
F:\32‐1881.00 Timnath Master Plan Update\Hydrology\EPA SWMM\Results\Subbasin Results.xlsx 8/21/2018
TRIC SPILL B
TRIC SPILL C
TRIC SPILL D
TRIC SPILL E
TRIC
TRIC 100yr
Spill Boundary (E.C.)
Timnath
Reservoir
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TRIC SPILL A 350 cfs Max Capacity
275 c
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190 c
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49124912.54910.77Timnath Reservoir Inlet Canal Spills Map
q
SRH-2D Model Results (Existing 100-year)
Document Path: F:\32-1881.00 Timnath Master Plan Update\GIS\MXD\TRIC Spills\TRIC Spills_100yr Existing.mxd Date: 8/21/2018MCLAUGHLIN LN.Legend
TRIC 100-year WSEL Contours (Existing)
TRIC 100-year Boundary (Existing)
850
Feet