HomeMy WebLinkAboutOAK 140 - FDP200022 - - DRAINAGE REPORT
DRAINAGE REPORT
FOR
OAK 140
AT
140 EAST OAK STREET
FORT COLLINS, CO 80524
PREPARED FOR
NOVEMBER 16, 2020
November 16, 2020
Dan Mogen
City of Fort Collins Utilities – Stormwater Engineering
700 Wood Street
Fort Collins, CO 80521
RE: Oak 140 – Drainage Report
JVA Job No. 3258c
Dear Dan:
The following Drainage Report and attached drainage maps have been prepared for the Oak 140
redevelopment project. The report and drainage maps have been produced in accordance with the
City of Fort Collins and the latest local Mile High Flood District recommendations.
It is our understanding that the information provided herein meets all requirements of the City of
Fort Collins.
Please contact us if you have any questions regarding this submission.
Sincerely,
JVA, Inc.
__________________________
Erik T. Nakos, P.E.
Project Manager
Oak 140 Drainage Report
Page 2 of 7
ENGINEER’S STATEMENT:
“I hereby certify that this report (plan) for the Drainage Design for the Oak 140 redevelopment
was prepared by me (or under my direct supervision) in accordance with the provisions of the City
of Fort Collins Standards for the Responsible Parties thereof. I understand that the City of Fort
Collins does not and shall not assume liability for drainage facilities designed by others.”
______________________________
Charles R. Hager, IV
Registered Professional Engineer
State of Colorado No. 37146
Oak 140 Drainage Report
Page 3 of 7
GENERAL LOCATION AND EXISTING SITE INFORMATION
The Oak 140 (site) is located in Section 12, Township 7 North, Range 69 West of the 6th Principal
Meridian, in Larimer County, Fort Collins, Colorado. Refer to Appendix A for the site vicinity
map. The site is bordered to the south by E Oak Street, to the east by Remington Street, and to the
east by Montezuma Fuller Alley. Developed residential areas are to the north, south, east and west
of the site. The existing site, platted as Lots 23-26, 29 and W 33 Ft Lot 30 all in Block 121, FTC
(same owner: Fort Collins Downtown Development Authority), is predominantly gravel and
asphalt from a previously demolished building. This site is part of the master drainage plan for the
Old Town Drainage Basin and designed to conform to the drainage basin design.
The site is approximately 0.58 acres of previously developed property and has a historical percent
impervious of 92.6%. With the historical building removed years ago, the existing site has less
percent imperviousness with a gravel lot, however the drainage design was calculated to the
historical site. The existing ground surface is relatively flat, generally sloping to the east at grades
ranging from 0.1% to 3.0%.
From the geotechnical report dated May 5, 2020 the soil is mainly clayey sand. Groundwater was
encountered at 14 ft to 20 ft below the ground surface. The Summary Logs of Exploratory Borings
from the geotechnical report is attached in Appendix A.
The site is located outside FEMA and City of Fort Collins mapped 100-year and 500-year
floodplains, per FEMA Flood Risk Map Number 08069C0979H, effective date 05/02/2012. The
site is comprised of hydrologic soil group C/D per NRCS soil survey. The FEMA Firm Map and
NRCS Websoil Survey are included in Appendix A.
In general, the proposed redevelopment of the site consists of constructing a new building and
surrounding hardscape for proposed pedestrian pathways. In the new building, the roof drains will
be conveyed to 3rd floor LID planters to be used as LID treatment. Any excess flow will bypass
the system through a series of overflows and be conveyed to the public storm system to the south
in Oak street.
The site development will decrease the overall percent impervious slightly by 1.3% to a total of
91.3% from the historical 92.6%. The Old Town Drainage Basin requirements are that detention
is required if there is an increase of impervious area by an additional 5,000 SF from the historical
site. Since there is no proposed increase of imperviousness of the site from the historical site, there
is no detention required for this project. However, as part of the City of Fort Collins Storm Criteria,
there are water quality and LID treatment requirements because the project includes over 1,000 SF
of new or modified impervious area. The water quality requirement for the site is fulfilled by the
existing Udall water quality facility located to the east of the site by the Cache la Poudre River.
The Udall facility is considered to treat 50% of the site’s area. The LID requirement is to treat
50% of the added or modified impervious area. The proposed LID planters on the 3rd floor of the
building will treat the proposed roof (not including terrace areas) which will exceed the required
50%, and thus the entire site will be considered treated.
Oak 140 Drainage Report
Page 4 of 7
DRAINAGE BASINS AND HISTORIC RUNOFF
HISTORIC DRAINAGE
The existing site consists of one basin. The runoff from the existing site sheet flows to the east
through a sidewalk chase and into Remington Street. Then appears to flow north in Remington
Street to Mountain Ave and is then captured in the curb inlet on the south side of Mountain Ave,
west of Remington St.
PROPOSED DRAINAGE
Proposed drainage patterns are to remain generally the same as the current but will utilize a LID
treatment system for the roof area imperviousness before discharging to the public storm system.
The bioretention system will be utilized for low impact development (LID) treatment requirements
of the site. With the added or modified imperviousness area for the project being 0.69 acres, the
50% required area to treat is 0.34 acres. With the proposed roof area being treated, 0.37 acres, this
project will exceed the City requirement by treating 54% of the added or modified imperviousness.
The bioretention systems will reduce runoff, treat and slowly release the water quality capture
volume as part of the four step process for the City of Fort Collins criteria on BMP selection.
Detention will not be required as we are meeting the planned design outlined in the Old Town
Basin Master Drainage Plan and not increasing the site imperviousness as com pared to historical
imperviousness.
For the purposes of calculations, the site was divided into 5 basins. Basin 1 includes the proposed
building roof that is conveyed to the LID planter on the 3 rd floor. Basin 2 consists of the area of
the LID planter itself. Basin 3 is the roof area that is not conveyed to the LID planter and is
conveyed through combined and conveyed through roof drain overflow. Basin 4 consists of the
are within the property line to the north of the building that has modified impervious area. Basin
5 is the area outside the property line that has modified impervious area. The proposed building
roof (Basin 1) is draining to the bioretention system (Basin 2) and is joined by the roof drain areas
not collected in the LID (Basin 3), then conveyed to the public storm system at the inlet in Oak
Street. The surrounding proposed hardscapes (Basins 4 & 5) will drain to either the south in the
Oak storm system or to Remington Street as the site has done historically and is not anticipated to
have any additional impacts to the surrounding area.
A series of 5 area drains and 5 overflow drains will be utilized in the LID planter area, sized by
the plumbing engineer per the International Plumbing Code. The lower area drains will allow
runoff to be treated and slowly drain the WQ storm while the overflow drains will capture any
flows that overflow for events larger up to the 100-yr storm. Events larger than that would overflow
onto the deck of the third floor terrace and captured in the overflows drains on the deck and
conveyed to discharge on the south side of the building.
DRAINAGE DESIGN CRITERIA
HYDROLOGIC METHOD AND DESIGN STORM FREQUENCIES
The drainage for the site was designed to meet or exceed the City of Fort Collins’s Standards and
Specifications, including the Stormwater Criterial Manual which incorporates most of the Mile
High Flood District’s (MFHD) Urban Storm Drainage Criteria Manual (USDCM).
Oak 140 Drainage Report
Page 5 of 7
The design one hour point rainfall used for the 2 year and 100 year storm events are 0.82 inches
and 2.86 inches respectively.
The Rational Method (Q=CIA) was used to determine the storm runoff (Q) from the areas
contributing to the new storm system, with composite runoff coefficients (C) and contributing
areas (A) given for design points in sub-basins. The runoff coefficients for various land usages
were obtained from FCDCM, Chapter 5. Intensities (I) were determined using the Time-Intensity-
Frequency equations, and a calculated Time of Concentration (tc). Hydraulic Criteria. See
Appendix B for the runoff coefficient calculations.
HYDRAULIC CRITERIA
The proposed drainage system has been designed to comply with the City of Fort Collins
Stormwater Criteria Manual. The MHFD UD-BMP spreadsheet version 3.07 was used to analyze
the designed bioretention. Area drains were sized using MHFD’s USDCM Section 3.3.6 and
calculations are included with the rational calculations in Appendix B. Complete drainage plans,
details, dimensions, etc. are included in the grading and drainage plans in the site’s construction
documents.
VARIANCES FROM THE CRITERIA
No variances are requested for this design.
FOUR STEP PROCESS
The Four Step Process implemented by the City of Fort Collins for stormwater quality
management is:
1. Reduce runoff through use of Low Impact Development (LID) and Minimizing Directly
Connected Impervious Area (MDCIA)
2. Implement BMPs that provide a WQCV with slow release.
3. Stabilize Streams
4. Implement site specific and other source control BMPs.
This project is addressing this Four Step Process in the following ways;
1. The reduction of impervious area compared to historical, as well as the use of LID
bioretention planters to reduce runoff
2. The use of the LID biorentention system to capture and slow release, as well as the use of
the existing Udall facility.
3. There is no negative impact to stream erosion with the development of this site as compared
to historical.
4. The trash enclosure is located far away from the storm drainage facilities so that highly
polluted runoff has an opportunity to be cleaned prior to runoff in storm drainage. During
construction, erosion and sedimentation controls shall be used to prevent the risk of
sediment from entering the storm drainage system
Oak 140 Drainage Report
Page 6 of 7
DRAINAGE FACILITY DESIGN
GENERAL CONCEPT
The site’s private storm drainage system has been designed to convey the 100-year storm event
through a combination of bioretention, inlets and pipes that connect into the existing curb inlet in
Oak Street. The hardscape around the building will be graded to drain into the ROW as it has
historically done. The existing public system in Oak Street and Remington are assumed to have
sufficient capacity for the developed flow as the developed impervious and runoff rates are less
than the historical rates.
The proposed bioretention planters located on the 3rd floor of the building will treat storm runoff
for a minimum of 50% of the modified or added impervious area on the site for water quality
treatment prior to discharging into the public storm system, satisfying the City of Fort Collins LID
requirements. These features will facilitate sedimentation and filtration while limiting erosion,
providing both treatment and slowed release of the water quality capture volume. The proposed
redevelopment of this site will serve to limit water quality and quantity impacts to natural
drainageways by decreasing the frequency, rate, duration, and volume of runoff.
STORMWATER POLLUTION PREVENTION/EROSION CONTROL
As site is less than 1 acre of disturbed area, an erosion control report is not required per City of
Fort Collins Storm Criteria. However, an erosion control plan and escrow is submitted to meet
with City requirements. During construction, temporary erosion and sediment control practices
will be used to limit soil erosion and sediment discharge off the site and into public existing
stormwater infrastructure.
TEMPORARY EROSION CONTROL
A temporary erosion control plan is to be implemented for the site during construction. Temporary
erosion control measures include, but are not limited to, vehicle tracking control, concrete washout
areas, and inlet and slope protection provided using erosion control wattles/sediment control logs,
rock socks, etc. All temporary erosion control measures are to be removed after they are deemed
unnecessary. A general erosion control plan has been provided in the civil construction documents.
PERMANENT EROSION CONTROL
Chapter 2 of the Urban Drainage and Flood Control District’s Urban Storm Drainage Criteria
Manual Volume 3 (USDCM) provides guidelines for the selection of appropriate permanent
structural BMPs for a site that is to be developed or redeveloped. The Oak 140 is best characterized
as a “conventional redevelopment” with under 1 acre of impervious area on the project site. The
BMP decision tree for such sites is provided in Figure 2 -2 of the USDCM. As previously stated,
the site and surrounding vicinity is comprised of hydrologic soil group Type C/D soils, per the
NRCS soil survey.
The water quality capture volume (WQCV) for this site is accounted for in the existing Udall water
quality and detention facility. No detention is required on the site. Runoff will be collected in the
private storm system before connecting to the public storm system, or sheet flow into the ROW as
it has done historically. The existing storm system should have sufficient capacity for the sites
runoff flows as the imperviousness and runoff from the site is less than the historical flows.
Oak 140 Drainage Report
Page 7 of 7
CONCLUSIONS
This Drainage Report for the Oak 140 has been prepared to comply with the stormwater criteria
set by the City of Fort Collins and the Mile High Flood Control District.
The proposed drainage system presented in this report is designed to convey the 100-year peak
stormwater runoff through the site via the proposed and existing storm systems. Through
calculations, modeling, and review of the proposed storm drain system, there appears to be
adequate capacity to convey the proposed flows to the existing storm system.
It can therefore be concluded that development of the Oak 140 complies with all of the stormwater
jurisdictional criteria and will not adversely affect the existing streets, storm drain system and/or
detention/water quality facilities.
REFERENCES
1. City of Fort Collins Stormwater Criteria Manual, City of Fort Collins, December 2018.
2. “Geotechnical Investigation Proposed Apartment Complex, 140 East Oak Street, Fort
Collins, Colorado”, CTL Thompson Incorporated, Dated May 5, 2020.
3. “Urban Storm Drainage Criteria Manual”, Mile High Flood District, August 2018 version.
4. FEMA Flood Insurance Rate Map, Map Number 08069C0979H, Map Revised May 2,
2012
5. USDA NRCS Web Soil Survey
APPENDIX A – REFERENCED INFORMATION
Oak 140
140 East Oak St
Fort Collins, CO
MAP NOT TO SCALE
(Image from Google Earth)
0
5
10
15
20
25
30
35
40
0
5
10
15
20
25
30
35
40
6/12
14/12
50/2
50/1
50/2
50/2
WC=12.4
DD=119
SW=0.0
SS=<0.01
WC=17.7
DD=113
SW=0.1
WC=12.4
DD=119
SW=0.0
SS=<0.01
WC=17.7
DD=113
SW=0.1
TH-1
8/12
50/11
50/8
50/1
50/2
50/2
50/2
WC=15.4
DD=112
LL=34 PI=19
-200=53
WC=2.6
-200=5
WC=15.7
DD=106
-200=20
WC=15.4
DD=112
LL=34 PI=19
-200=53
WC=2.6
-200=5
WC=15.7
DD=106
-200=20
TH-2
6/12
19/12
50/8
50/1
WC=15.0
DD=113
SW=0.1
WC=13.2
DD=117
SW=0.6
WC=8.7
-200=16
WC=15.0
DD=113
SW=0.1
WC=13.2
DD=117
SW=0.6
WC=8.7
-200=16
TH-3
10/12
14/12
50/7
50/2
WC=14.9
DD=115
SW=0.0
WC=11.4
DD=124
-200=30
WC=14.9
DD=115
SW=0.0
WC=11.4
DD=124
-200=30
TH-4
9/12
14/12
50/8
50/1
50/1
50/2
WC=14.5
DD=115
SW=0.0
SS=0.180
WC=12.3
DD=119
SW=0.1
WC=14.5
DD=115
SW=0.0
SS=0.180
WC=12.3
DD=119
SW=0.1
TH-5
DEPTH - FEETDRIVE SAMPLE. THE SYMBOL 6/12 INDICATES 6 BLOWS OF A 140-POUND HAMMER
FALLING 30 INCHES WERE REQUIRED TO DRIVE A 2.5-INCH O.D. SAMPLER 12 INCHES.
FILL, SAND, CLAYEY WITH OCCASIONAL GRAVEL, MOIST, LOOSE, BROWN, DARK BROWN
1.
NOTES:
THESE LOGS ARE SUBJECT TO THE EXPLANATIONS, LIMITATIONS AND CONCLUSIONS IN
THIS REPORT.
WATER LEVEL MEASURED SEVERAL DAYS AFTER DRILLING.
SAND, CLAYEY, MOIST, MEDIUM DENSE, BROWN (SC)
3.
LEGEND:
SAND AND GRAVEL, SLIGHTLY CLAYEY, MOIST TO WET, VERY DENSE, REDDISH BROWN,
BROWN (SC, SP, SW-SC, GP)
SANDSTONE, CLAYEY, MOIST TO WET, VERY HARD, BROWN, OLIVE
DEPTH - FEETWATER LEVEL MEASURED AT TIME OF DRILLING.
Summary Logs of
Exploratory Borings
THE BORINGS WERE DRILLED ON APRIL 24, 2020 USING 4-INCH DIAMETER
CONTINUOUS-FLIGHT AUGERS AND A TRUCK-MOUNTED DRILL RIG.
FIGURE 2
WC
DD
SW
-200
LL
PI
UC
SS
-
-
-
-
-
-
-
-
INDICATES MOISTURE CONTENT (%).
INDICATES DRY DENSITY (PCF).
INDICATES SWELL WHEN WETTED UNDER OVERBURDEN PRESSURE (%).
INDICATES PASSING NO. 200 SIEVE (%).
INDICATES LIQUID LIMIT.
INDICATES PLASTICITY INDEX.
INDICATES UNCONFINED COMPRESSIVE STRENGTH (PSF).
INDICATES SOLUBLE SULFATE CONTENT (%).
2.
HOUSING CATALYST
140 EAST OAK STREET
CTL | T PROJECT NO. FC09242-125
United States
Department of
Agriculture
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, ColoradoNatural
Resources
Conservation
Service
April 22, 2020
Preface
Soil surveys contain information that affects land use planning in survey areas.
They highlight soil limitations that affect various land uses and provide information
about the properties of the soils in the survey areas. Soil surveys are designed for
many different users, including farmers, ranchers, foresters, agronomists, urban
planners, community officials, engineers, developers, builders, and home buyers.
Also, conservationists, teachers, students, and specialists in recreation, waste
disposal, and pollution control can use the surveys to help them understand,
protect, or enhance the environment.
Various land use regulations of Federal, State, and local governments may impose
special restrictions on land use or land treatment. Soil surveys identify soil
properties that are used in making various land use or land treatment decisions.
The information is intended to help the land users identify and reduce the effects of
soil limitations on various land uses. The landowner or user is responsible for
identifying and complying with existing laws and regulations.
Although soil survey information can be used for general farm, local, and wider area
planning, onsite investigation is needed to supplement this information in some
cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/
portal/nrcs/main/soils/health/) and certain conservation and engineering
applications. For more detailed information, contact your local USDA Service Center
(https://offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil
Scientist (http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/contactus/?
cid=nrcs142p2_053951).
Great differences in soil properties can occur within short distances. Some soils are
seasonally wet or subject to flooding. Some are too unstable to be used as a
foundation for buildings or roads. Clayey or wet soils are poorly suited to use as
septic tank absorption fields. A high water table makes a soil poorly suited to
basements or underground installations.
The National Cooperative Soil Survey is a joint effort of the United States
Department of Agriculture and other Federal agencies, State agencies including the
Agricultural Experiment Stations, and local agencies. The Natural Resources
Conservation Service (NRCS) has leadership for the Federal part of the National
Cooperative Soil Survey.
Information about soils is updated periodically. Updated information is available
through the NRCS Web Soil Survey, the site for official soil survey information.
The U.S. Department of Agriculture (USDA) prohibits discrimination in all its
programs and activities on the basis of race, color, national origin, age, disability,
and where applicable, sex, marital status, familial status, parental status, religion,
sexual orientation, genetic information, political beliefs, reprisal, or because all or a
part of an individual's income is derived from any public assistance program. (Not
all prohibited bases apply to all programs.) Persons with disabilities who require
2
alternative means for communication of program information (Braille, large print,
audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice
and TDD). To file a complaint of discrimination, write to USDA, Director, Office of
Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or
call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity
provider and employer.
3
Contents
Preface....................................................................................................................2
Soil Map..................................................................................................................5
Soil Map................................................................................................................6
Legend..................................................................................................................7
Map Unit Legend..................................................................................................8
Map Unit Descriptions..........................................................................................8
Larimer County Area, Colorado......................................................................10
35—Fort Collins loam, 0 to 3 percent slopes..............................................10
94—Satanta loam, 0 to 1 percent slopes....................................................11
References............................................................................................................13
4
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.
5
6
Custom Soil Resource Report
Soil Map
449276544927734492781449278944927974492805449281344928214492829449276544927734492781449278944927974492805449281344928214492829493547 493555 493563 493571 493579 493587 493595
493547 493555 493563 493571 493579 493587 493595
40° 35' 10'' N 105° 4' 34'' W40° 35' 10'' N105° 4' 32'' W40° 35' 8'' N
105° 4' 34'' W40° 35' 8'' N
105° 4' 32'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 15 30 60 90
Feet
0 5 10 20 30
Meters
Map Scale: 1:345 if printed on A portrait (8.5" x 11") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Larimer County Area, Colorado
Survey Area Data: Version 14, Sep 13, 2019
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Aug 11, 2018—Aug
12, 2018
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Custom Soil Resource Report
7
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
35 Fort Collins loam, 0 to 3 percent
slopes
0.1 30.9%
94 Satanta loam, 0 to 1 percent
slopes
0.3 69.1%
Totals for Area of Interest 0.4 100.0%
Map Unit Descriptions
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 intensive use of small areas is planned, however,
Custom Soil Resource Report
8
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.
Custom Soil Resource Report
9
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: 135 to 160 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: Stream terraces, interfluves
Landform position (three-dimensional): Interfluve, tread
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Pleistocene or older alluvium 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 to very slightly saline (0.1 to 2.0
mmhos/cm)
Available water storage in profile: High (about 9.1 inches)
Interpretive groups
Land capability classification (irrigated): 3e
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: C
Ecological site: Loamy Plains (R067BY002CO)
Hydric soil rating: No
Custom Soil Resource Report
10
Minor Components
Nunn
Percent of map unit: 10 percent
Landform: Stream terraces
Landform position (three-dimensional): Tread
Down-slope shape: Linear
Across-slope shape: Linear
Ecological site: Loamy Plains (R067BY002CO)
Hydric soil rating: No
Vona
Percent of map unit: 5 percent
Landform: Interfluves
Landform position (three-dimensional): Side slope, interfluve
Down-slope shape: Linear
Across-slope shape: Linear
Ecological site: Sandy Plains (R067BY024CO)
Hydric soil rating: No
94—Satanta loam, 0 to 1 percent slopes
Map Unit Setting
National map unit symbol: 2wz89
Elevation: 3,670 to 5,410 feet
Mean annual precipitation: 10 to 23 inches
Mean annual air temperature: 45 to 52 degrees F
Frost-free period: 105 to 160 days
Farmland classification: Prime farmland if irrigated
Map Unit Composition
Satanta and similar soils: 90 percent
Minor components: 10 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Satanta
Setting
Landform: Alluvial fans
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Head slope
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Alluvium
Typical profile
Ap - 0 to 10 inches: loam
Bt - 10 to 17 inches: clay loam
C - 17 to 79 inches: loam
Custom Soil Resource Report
11
Properties and qualities
Slope: 0 to 1 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: Negligible
Capacity of the most limiting layer to transmit water (Ksat): Moderately high (0.20
to 0.60 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum in profile: 10 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 12.3 inches)
Interpretive groups
Land capability classification (irrigated): 1
Land capability classification (nonirrigated): 2e
Hydrologic Soil Group: C
Ecological site: Sandy Plains (R072XY111KS)
Hydric soil rating: No
Minor Components
Fort collins
Percent of map unit: 5 percent
Landform: Alluvial fans
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Head slope
Down-slope shape: Linear
Across-slope shape: Linear
Ecological site: Sandy Plains (R072XY111KS)
Hydric soil rating: No
Nunn
Percent of map unit: 5 percent
Landform: Terraces
Landform position (three-dimensional): Tread
Down-slope shape: Linear
Across-slope shape: Linear
Ecological site: Loamy Lowland (R072XY108KS)
Hydric soil rating: No
Custom Soil Resource Report
12
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.nrcs.usda.gov/wps/portal/
nrcs/detail/national/soils/?cid=nrcs142p2_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 Handbook 436. http://
www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053577
Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of
Agriculture, Natural Resources Conservation Service. http://
www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_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.nrcs.usda.gov/wps/portal/nrcs/detail/soils/
home/?cid=nrcs142p2_053374
United States Department of Agriculture, Natural Resources Conservation Service.
National range and pasture handbook. http://www.nrcs.usda.gov/wps/portal/nrcs/
detail/national/landuse/rangepasture/?cid=stelprdb1043084
13
United States Department of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 430-VI. http://www.nrcs.usda.gov/wps/portal/
nrcs/detail/soils/scientists/?cid=nrcs142p2_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.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?
cid=nrcs142p2_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/Internet/FSE_DOCUMENTS/nrcs142p2_052290.pdf
Custom Soil Resource Report
14
544982.633cp elecbox
55
4982.956
cp chase
56
4982.462
cp tbw
574981.353cp drive4982.240fnd1084982.207fnd n and s14823 1094981.346fnd n and s1124981.672fnd n and s
113
4982.384
fnd n and s383481590
4983.043
inletgrt
1591
4982.992
inletgrt
1592
4982.922
inletgrt
1593
4982.867
inletgrt
1596
4981.879
h2ovalveHYD
1597
4982.240
fh
1598
4981.659
h2ovalve
W
1600
4981.737
meterh2o
CONTROL
IRR
1601
4982.043
irrcvW
1602
4982.250
meterh2o
1603
4982.232
lp
1604
4981.901
sign1 pedxing
1605
4982.567
treed18
1606
4982.417
treed18
16074981.376sign1 2hr prkng
1608
4982.354
sign1 2hr prkng
1609
4982.640
sign1 2hr prkng
1610
4982.973
sign1 2hr prkng
W
1611
4983.372
meterh2o
CONTROL
IRR
1612
4982.854
irrcv1613
4983.803
treed4 1614
4983.618
G
1615
4983.295
metergas
G
1616
4983.105
metergas
G 21194982.822metergas G 21204982.167metergasELEC21214982.495elecboxVAULTCABLE21224982.581cablevlt21234982.701inletgrtG21244983.220metergasG21254983.217metergas21264983.228inletgrtAC21274983.019acunitVAULTELEC21284982.771elecvltELEC21294985.501
elecbox
2130
4982.479
inletgrt
2131
4983.668
inletgrt
2132
4983.603
inletgrt
C
2133
4983.612
pedcable
T
2134
4983.185
pedtele
VAULT
CABLE
2135
4983.230
cablevlt
VAULTTELE 21364982.882
televlt
VAULTELEC 21374982.692elecvlt21384982.676inletgrt VAULTELEC 21394982.467elecvlt21404982.344lp21414982.437lp21424982.487bollard21434982.491bollardE21444982.654meterelcELEC21454982.595elecbox E 21464982.108meterelc21474981.828lp21484982.175bollard21494982.740column 1.3x1.321504982.807column 1.3x1.321514982.783column 1.3x1.321524982.693column 1.3x1.321534982.593column 1.3x1.321544982.695column 1.3x1.321554982.557column 2.8x2.821564982.560column 2.8x2.8 21574982.111bollard21584982.082bollard21594982.046bollard21604981.996bollard21614981.982bollardELEC21624983.393elecbox
D
2166
4983.429
mhsan
2167
CONTROL
IRR
2168
4982.967
irrcv
CONTROL
IRR
2169
4982.063
irrcv
VAULTELEC 21714980.987elecvltC21724981.135pedcableCS21774981.356h2ostopFOFOEEEGFOEEEEETTTTTCTVCTVCTVCTV
CTVCTVCTVCTVCTVCTVCTVCTVCTVCTVTTTTTTTTTTTTTT
TTTTTGGGGG G G G
GGGGGGGGIRRIRRIRRIRRIRRIRRIRRIRRIRRIRRIRRFOFOFOFOFOFO0.2'±0.1'±20' ALLEYSSSSSSSSSSSSSSSSSSSSSSSTSTSTSTSTSTSTSTSTSTD 24982.354mhstorm
3
4981.654
inletgrt
4
4981.622
inletgrt
2116
4981.611
inletgrt
2117
4981.535
inletgrt
2118
4981.525
inletgrt
12" PVC257.2 LF 12" PVC @ 1.41%30974981.946postsqr 4x6in4981.941postsqr 4x6in30994981.927postsqr 4x6in4981.466postsqr 4x6in 31324981.501bollard31334981.393bollard 31344981.246bollardE31674982.064meterelcELECBRKR31864982.379elecbrkrELECBRKR31874982.295elecbrkrmeterelc 9 total 36234980.790h2ovalveh2ostop2.4'11.3'25.2'EWWWWWWWWWWEEEEEETGEEECTV EEEEEEEEEEEETTTTTEEEEEEEEEBASIS OF BEARINGS
LOT 23
LOT 24
LOT 25
LOT 26
LOT 27LOT 28LOT 29LOT 30
FND NAIL & BRASS
TAG, LS 38348
FND HOLEFOR N&SFND NAIL & BRASSTAG, LS 14823
CP "CHASE"
CHISELED "X"
IN CONCRETE CP "TBW"
CP "ELECBOX"CHISELED "X"IN CONCRETE
BUILDING ON
OR NEAR
PROPERTY LINE
BUILDING ONOR NEARPROPERTY LINE6' WIDE ELECTRICALEASEMENT(BOOK 1895, PAGE 353)20' ACCESS EASEMENT(REC. NO. 97005964)35' ACCESS EASEMENT(REC. NO. 97001702)ASPHALT ASPHALT
- BLOCK 121 -
110 EAST OAK LLC
110 EAST OAK LLC
HEWITT JAMES C/
HEWITT JAMES C/
HEWITT FAMILY TRUST140-2 SOUTH COLLEGEAVENUE LLCKGB HOLDINGS LLCKGB HOLDINGS LLC REMINGTON LLP CP "DRIVE"CHISELED "X"IN CONCRETE
N00°19'03"E 200.05'S89°42'21"E 107.00'N89°41'52"W 60.00'S00°19'03"W 50.00'S89°42'27"E 60.00'N89°42'21"W 140.00'
60.1'50.1'60.1'50.2'20.3'0.2'16.5'14.1'8.0'14.1'23.5'4.7'4.6'22.0'S00°19'03"W 25.03'ACCESS EASEMENT(REC. NO. 97005964)(HATCHED AREA) 100.03'WESTCOTTENTERPRISES LLCFF=4982.49FF=4984.75FF=4984.24
FF=4983.25
FF=4984.64
1 STORY BRICKFF=4982.542 HOUR PARKING
2 HOUR PARKING
BIKE RACK2 HOUR PARKING
STORM INLET
GRATE=4981.61
FL=4977.51 (S)
STORM MH
RIM=4983.43
INV=4979.25 (N, SW)
11.1 LF 18" RCP @ 0.27%
SAN MH
RIM=4983.62
INV=4975.77 (N, S)
STORM MHRIM=4982.35INV=4979.43 (N, S)
194.4 LF 18"
RCP @ 0.09%
HISTORIC PERCENTAGE OF IMPERVIOUSNESS
3258c-140 E. OAK STREET
07-07-2020
1319 Spruce Street
Boulder, CO 80302
303.444.1951
www.jvajva.com
JVA, Inc.
Boulder ● Fort Collins ● Winter Park
Glenwood Springs ● Denver
HISTORIC PERCENTAGE OF IMPERVIOUSNESS
HY D
CONTROL
IRR
W
W
CONTROL
IRR
G
G
G GELECVAULTCABLEGGACVAULTELEC
ELEC
C
T
VAULT
CABLE
VAULTTELE VAULTELECVAULTELEC E E
D
CONTROL
IRR
CONTROL
IRR
VAULTELECC C SFOFOEEEGFOEEEETCTVCTVCTVCTV
CTVCTVCTVCTVCTVCTVCTVCTVCTVCTVTTTTTTTTTT
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FND NAIL & BRASS
TAG, LS 38348
FND HOLEFOR N&SFND NAIL & BRASSTAG, LS 14823
CP "CHASE"
CHISELED "X"
IN CONCRETE CP "TBW"
CP "ELECBOX"CHISELED "X"IN CONCRETE 6' WIDE ELECTRICALEASEMENT(BOOK 1895, PAGE 353)20' ACCESS EASEMENT(REC. NO. 97005964)35' ACCESS EASEMENT(REC. NO. 97001702)ASPHALT
110 EAST OAK LLC
110 EAST OAK LLC
HEWITT JAMES C/
HEWITT JAMES C/
HEWITT FAMILY TRUST140-2 SOUTH COLLEGEAVENUE LLCKGB HOLDINGS LLCKGB HOLDINGS LLC REMINGTON LLP CP "DRIVE"CHISELED "X"IN CONCRETE20.3'0.2'16.5'14.1'8.0'14.1'23.5'4.7'4.6'22.0'WESTCOTTENTERPRISES LLCFF=4984.75FF=4984.24
FF=4983.25
FF=4984.64 FF=4982.54BIKE RACK2 HOUR PARKING
4" WIDE
CONCRETE WALL
STONE
BENCH
6" WIDE CONCRETE
STORM INLET
GRATE=4981.61
FL=4977.51 (S)
STORM MH
RIM=4983.43
INV=4979.25 (N, SW)
11.1 LF 18" RCP @ 0.27%
SAN MH
RIM=4983.62
INV=4975.77 (N, S)
STORM MHRIM=4982.35INV=4979.43 (N, S)
194.4 LF 18"
RCP @ 0.09%
LOT 23
LOT 24
LOT 25
LOT 26
LOT 27LOT 28LOT 29LOT 30
- BLOCK 121 -
DEVELOPED PERCENTAGE OF IMPERVIOUSNESS
3258C-140 E. OAK STREET
11-16-2020
1319 Spruce Street
Boulder, CO 80302
303.444.1951
www.jvajva.com
JVA, Inc.
Boulder ● Fort Collins ● Winter Park
Glenwood Springs ● Denver
DEVELOPED PERCENTAGE OF IMPERVIOUSNESS
HY DCONTROL
IRR
W
W
CONTROL
IRR
G
G
G
G
ELEC
VAULT
CABLE
G
G
AC
VAULT
ELEC
ELEC
C
T
VAULT
CABLE
VAULT
TELE
VAULT
ELEC
VAULT
ELEC
E
E
D
CONTROL
IRR
CONTROL
IRR
D
VAULT
ELEC
C
VAULT
ELEC
CONTROL
IRR
C SFOFOEEEIRRIRRIRRTTTTGGGGFOEEEETCTVCTVCTVCTV
CTVCTVCTVCTVCTVCTVCTVCTVCTVCTVTTTTTTTTTT
TTTTTTGGGGGGGGGGGGGIRRIRRIRRIRRIRRIRRIRRIRRIRRIRRIRRFOFOFOFOFOFOFO20' ALLEYEAST OAK STREET
(100' PUBLIC R.O.W.)SSSSSSSSSSSSSSSSSSSSSSSSSSSSST ST ST ST ST ST ST ST ST ST ST ST ST STSTSTSTSTSTSTSTSTSTSTSTSTSTD
STSTSTELEC
ELEC
T
VAULT
TELE
C
T
EELEC
BRKR
ELEC
BRKR
E
VAULT
ELEC
D
C S
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20.3'0.2'16.5'14.1'8.0'14.1'23.5'4.7'51.0'4.6'22.0'
LOT 23
LOT 24
LOT 25
LOT 26
LOT 27
LOT 28
LOT 29
LOT 30
- BLOCK 121 -REMINGTON STREET(100' PUBLIC R.O.W.)DRAWING NUMBER:
419 Canyon Ave. Suite 200 Fort Collins, CO 80521
phone 970.224.5828 | fax 970.225.6657 | www.ripleydesigninc.com
■ land planning ■ landscape architecture ■
■ urban design ■ entitlement ■
ISSUED
PROJECT No.:
DRAWN BY:
REVIEWED BY:
SEAL:
PREPARED BY:
No.DESCRIPTION DATE
REVISIONS
No.DESCRIPTION DATE
Plotted By: Eric J. Kohnen Layout: 24x36 Printed On: 11/16/2020 5:50 PM File Name: 3258c-DPP.dwgORIGINAL SIZE 24X36
ENTI
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RIPLEY DESIGN INC.
Katy Thompson
419 Canyon Ave. Suite 200
Fort Collins, CO 80521
p. 970.224.5828
f. 970.225.6657
DOWNTOWN DEVELOPMENT AUTHORITY
Matt Robenalt, Executive Director
19 Old Town Square Suite #230
Fort Collins, CO 80524
p. 970.419.4381
ENGINEER
DEVELOPER
LANDSCAPE ARCHITECT
JVA CONSULTING ENGINEERS
Erik Nakos
213 Linden Street #200
Fort Collins, CO 80524
p. 970.255.9099
HOUSING CATALYST
Kristin Fritz, Chief Real Estate Officer
1715 W Mountain Ave.
Fort Collins, CO 80521
p. 970.416.2938
SHOPWORKS ARCHITECTURE
Chad Holtzinger
301 W 45th Avenue
Denver, CO 80216
p. 303.433.4094
OWNER
ARCHITECT
OAK 140
FDP SUBMITTAL
FORT COLLINS, CO
PDP ROUND 1 7-8-2020
R20-001
MEC
ETN
01
PDP ROUND 2 7-30-202002
FDP ROUND 1 10-21-202003
FDP ROUND 2 11-17-202004
FIGURE 3
DRAINAGE PLAN
APPENDIX B – HYDROLOGIC/HYDRAULIC
COMPUTATIONS
JVA Incorporated JVA Office:
213 Linden St, S 200 Fort Collins
Fort Collins, CO 80524
Ph: (970) 225 9099
Version 2019_XT: 9/3/2019
Project Information:
Job Name: Oak 140
Job Number: 3258c
Date: 11/18/2020
Designed by: EJK
Municipality : Fort_Collins Soil Type: C/D
Runoff Calculations:
Minor Design Storm: 2 year
Major Design Storm: 100 year
Detention Calculations:
Minor Storm Detention: 10 year plus 100 % WQCV
Major Storm Detention: 100 year plus 100 % WQCV
Detention Volume by: ≤5ac FAA >5ac FAA+20% Enter WQCV : 0 cf
(GB, PP, PLD, SFB, EDB,etc.)
Allowable Release Rates (if applicable):
Max release rate 1 cfs / acre? Yes Site Area: 0.00 acres
Enter Offsite flows to bypass site (these will be added to the allowable release rates)
Q10 = 0.00 cfs (bypass flows)Q10allow = 0.00 cfs
Q100 = 0.00 cfs (bypass flows)Q100allow = 0.00 cfs
Rainfall Data Information:
Enter City, Town, or County: Fort_Collins
Frequency of Design
Event Do you need to Calc P1? No
2 yr 0.82 in
5 yr 1.14 in
10 yr 1.40 in
100 yr 2.86 in
Runoff Coefficient Calculations:
Use UDFCD Equations? No
Intensity Duration Values:
I-D-F FortCollinsIDF
One Hour Point Rainfall P1
3258c - Rational Calculations INTRO Page 1 of 8
JVA IncorporatedJob Name: Oak 140I% C2 C5 C10 C100213 Linden St, S 200Job Number: 3258cStreets Paved 100% 0.95 0.95 0.95 1.00Fort Collins, CO 80524Date: 11/18/20Concrete Drives/Walks 90% 0.95 0.95 0.95 1.00Ph: (970) 225 9099By: EJKRoof 90% 0.95 0.95 0.95 1.00Gravel 40% 0.50 0.50 0.50 0.63Landscaping (B soil) 2% 0.15 0.15 0.15 0.19Oak 140Landscaping (C/D soil) 2% 0.25 0.25 0.25 0.31Historic Runoff Coefficient & Time of Concentration CalculationsPlayground 10% 0.11 0.11 0.11 0.14Location: Fort_CollinsArtificial Turf 25% 0.20 0.20 0.20 0.25Minor Design Storm: 2Major Design Storm: 100Soil Type: C/DBasin Design DataI (%) = 100% 90% 90% 40% 10% 25% 2% 2%I (%)tc Comptc FinalBasin NameDesign PointApaved streets (sf)Adrives/conc (sf)Aroof (sf)Agravel (sf)Aplygnd (sf)Aart. turf (sf)Alscape (B soil) (sf)Alscape (C/D soil) (sf)ATotal (sf)ATotal (ac)Imp (%)C2 C5 C10 C100Upper most Length (ft)Slope (%)ti (min)Length (ft)Slope (%)Type of Land SurfaceKVelocity (fps) tt (min)Time of Conc ti + tt = tcTotal Length (ft)tc=(L/180)+10 (min.) Min tcH 1 6,505 2,083 16,74325,331 0.58 92.6% 0.95 0.95 0.95 1.00100 1.0%2.8300 1.0%Paved areas & shallow paved swales20 2.0 2.5 5.3 400 12.2 5.30 0.00Paved areas & shallow paved swales20 0 10.00 0.00Paved areas & shallow paved swales20 0 10.00 0.00Paved areas & shallow paved swales20 0 10.00 0.00Paved areas & shallow paved swales20 0 10.0TOTAL SITE 6,505 2,083 16,743 0 0 0 0 0 25,331 0.58 92.6% 0.950.95 0.95 1.00Basin NameDesign PointTime of Conc (tc)C2 C5 C10 C100 2 5 10 100ATotal (sf)ATotal (ac)Q2 Q5 Q10 Q100H 1 5.3 0.95 0.95 0.95 1.00 2.80 0.00 4.78 9.76 25,331 0.58 1.540.00 2.64 5.670 00 0.000 00 0.000 00 0.000 00 0.00TOTAL SITE 25,331 0.58 1.54 0.00 2.64 5.67Initial Overland Time (ti)Travel Time (tt) tt=Length/(Velocity x 60)tc Urbanized Check ONRunoff Coeff's Rainfall Intensities (in/hr)Area Flow Rates (cfs)Runoff Coeff's3258c - Rational CalculationsHistoricPage 2 of 8
JVA Incorporated Job Name: Oak 140 I% C2 C5 C10 C100
213 Linden St, S 200 Job Number: 3258c
Streets Paved 100% 0.95 0.95 0.95 1.00
Fort Collins, CO 80524 Date: 11/18/20
Concrete Drives/Walks 90% 0.95 0.95 0.95 1.00
Ph: (970) 225 9099 By: EJK
Roof 90% 0.95 0.95 0.95 1.00
Gravel 40% 0.50 0.50 0.50 0.63
Landscaping (B soil) 0% 0.15 0.15 0.15 0.19
Oak 140 Landscaping (C/D soil) 0% 0.25 0.25 0.25 0.31
Composite Runoff Coefficient Calculations Playground 10% 0.11 0.11 0.11 0.14
Location: Fort_Collins
Artificial Turf 25% 0.20 0.20 0.20 0.25
Minor Design Storm: 2
Major Design Storm: 100
Soil Type: C/D
Basin Design Data
I (%) = 100% 90% 90% 40% 10% 25% 0% 0%I (%)
Basin
Name
Design
Point
Apaved
streets
(sf)
Adrives/c
onc (sf)
Aroof
(sf)
Agravel
(sf)
Aplygnd
(sf)
Aart. turf
(sf)
Alscape (B
soil)
(sf)
Alscape
(C/D soil)
(sf)
ATotal
(sf)
ATotal
(ac)
Imp
(%)C2 C5 C10 C100
1 1 16,966 16,966 0.39 90.0% 0.95 0.95 0.95 1.00
2 2 1,133 1,133 0.03 90.0% 0.95 0.95 0.95 1.00
TOTAL TO LID 0 0 18,099 0 0 0 0 0 18,099 0.42 90.0% 0.95 0.95 0.95 1.00
3 3 3,823 3,823 0.09 90.0% 0.95 0.95 0.95 1.00
4 4 3,061 338 3,399 0.08 99.0% 0.95 0.95 0.95 1.00
PROPERTY TOTAL 3,061 338 21,922 0 0 0 0 0 25,321 0.58 91.2% 0.95 0.95 0.95 1.00
5 5 64 4,522 522 5,108 0.12 80.9% 0.88 0.88 0.88 0.93
PROJECT TOTAL 3,125 4,860 21,922 0 0 0 0 522 30,429 0.70 89.5%0.94 0.94 0.94 0.99
Runoff Coeff's
3258c - Rational Calculations Developed C Page 3 of 8
JVA Incorporated Job Name: Oak 140
213 Linden St, S 200 Job Number: 3258c
Fort Collins, CO 80524 Date: 11/18/20
Ph: (970) 225 9099 By: EJK
Oak 140
Time of Concentration Calculations
Location: Fort_Collins
Minor Design Storm: 2
Major Design Storm: 100
Soil Type: C/D
Sub-Basin Data tc Comp tc
Final
Basin
Name
Design
Point
ATotal
(ac)C5
Upper
most
Length
(ft)
Slope
(%)
ti
(min)
Length
(ft)Slope (%) Type of Land Surface
Cv
Velocity
(fps)
tt
(min)
Time of
Conc
ti + tt = tc
Total
Length
(ft)
tc=(L/180)+
10 (min)
Min
tc
1 1 0.39 0.95 80 2.0%2.0 Paved areas & shallow
paved swales 20 0.0 0.0 2.0 80 10.4 5.0
2 2 0.03 0.95 5 1.0%0.6 Paved areas & shallow
paved swales 20 0.0 0.0 0.6 5 10.0 5.0
3 3 0.09 0.95 45 2.0%1.5 Paved areas & shallow
paved swales 20 0.0 0.0 1.5 45 10.3 5.0
4 4 0.08 0.95 33 0.5%2.0 150 1.0%
Paved areas & shallow
paved swales 20 2.0 1.3 3.2 183 11.0 5.0
5 5 0.12 0.88 20 2.0%1.4 Paved areas & shallow
paved swales 20 0.0 0.0 1.4 20 10.1 5.0
Initial Overland Time (ti)Travel Time (tt)
tt=Length/(Velocity x 60)
tc Urbanized Check
ON
3258c - Rational Calculations Developed Tc Page 4 of 8
JVA IncorporatedJob Name: Oak 140213 Linden St, S 200 Job Number: 3258cFort Collins, CO 80524 Date: 11/18/20Ph: (970) 225 9099 By: EJKOak 140LID AREA Calculations per City of Fort CollinsThe implementation of LID systems requires one of the following two options:Acres NotesTotal Project Area = 0.70 Area within the drainage boundaryTotal Project Impervious Area = 0.69 Area of impervious surfacesAdded or Modified Impervious Area = 0.69 Area of impervious surfaces - existing impervious surface areaRequired Impervious Area to be treated by LID=0.3450% of added or modified impervious areaTotal Site Imperv Area to LID = 0.42Provided Treatment Area= 0.37 54%3258c - Rational CalculationsLID AREAPage 5 of 8
JVA IncorporatedJob Name: Oak 140213 Linden St, S 200 Job Number: 3258cFort Collins, CO 80524 Date: 11/18/20Ph: (970) 225 9099 By: EJKOak 140Water Quality Capture Volume (WQCV) Calculations (UDFCD Volume 3 Chapter 3)For LID DesignWQCV=a((0.91I3)-(1.19I2)+(0.78I))Where: WQCV = Water Quality Capture Volume (watershed inches) a = Drain Time Coefficient (see table below ) I = Imperviousness (%/100)Drainage Time (hrs) Coefficient, a12 0.824 0.940 1.00a= 0.80 12 hour drawdown timeI= 0.900 %/100WQCV= 0.322 watershed inchesV=(WQCV/12)*A*43560WQCV= 0.322 watershed inchesA = 0.34 acreV = 481 cf RequiredV = 0.011 acre-ftFort Collins Stormwater Criteria ManualFort Collins Stormwater Criteria Manual3258c - Rational CalculationsWQCVPage 6 of 8
JVA IncorporatedJob Name: Oak 140213 Linden St, S 200Job Number: 3258cFort Collins, CO 80524Date: 11/18/20Ph: (970) 225 9099By: EJKOak 140Developed Storm Runoff CalculationsDesign Storm : 100 YearPoint Hour Rainfall (P1) : 2.86 Basin Name Design Point Area (ac) Runoff Coeff tc (min) C*A (ac) I (in/hr) Q (cfs) Total tc (min) SC*A (ac) I (in/hr) Q (cfs) Inlet Type Q intercepted Q carryover Q bypass Pipe Size (in) or equivalent Pipe Material Slope (%) Pipe Flow (cfs) Max Pipe Capacity (cfs) Length (ft) Velocity (fps) tt (min)Total Time (min) Notes11 0.39 1.00 5.00 0.39 9.95 3.885.00 0.399.95 3.88RD TO LID 3.8822 0.03 1.00 5.00 0.03 9.95 0.265.00 0.039.95 0.26LID5.00 0.429.95 4.13LID UD & AD 4.13 10 in PVC 2.0% 4.14.31 4.90.00 5.0033 0.09 1.00 5.00 0.09 9.95 0.875.00 0.099.95 0.87Overflow RD 0.87 12 in PVC 2.5% 0.97.948 6.20.13 5.135.13 0.509.89 4.98OAK INLET 4.98 12 in PVC 2.0% 5.07.010 5.60.03 5.1644 0.08 1.00 5.00 0.08 9.95 0.785.00 0.089.95 0.7855 0.12 0.93 5.00 0.11 9.95 1.085.00 0.119.95 1.08Pipe Pipe/Swale Travel TimeTOTAL TO LIDTOTAL TO OAK INLETDirect RunoffTotal Runoff Inlets3258c - Rational CalculationsQ100Page 7 of 8
JVA IncorporatedJob Name: Oak 140213 Linden St, S 200Job Number: 3258cFort Collins, CO 80524Date: 11/18/20Ph: (970) 225 9099By: EJKOak 140Developed Storm Runoff CalculationsDesign Storm : 2 YearPoint Hour Rainfall (P1) : 0.82 Basin Name Design Point Area (ac) Runoff Coeff tc (min) C*A (ac) I (in/hr) Q (cfs) Total tc (min) SC*A (ac) I (in/hr) Q (cfs) Inlet Type Q intercepted Q carryover Q bypass Pipe Size (in) or equivalent Pipe Material Slope (%) Pipe Flow (cfs) Max Pipe Capacity (cfs) Length (ft) Velocity (fps) tt (min)Total Time (min) Notes11 0.39 0.95 5.00 0.37 2.85 1.055.00 0.372.85 1.05 RD TO LID1.0522 0.03 0.95 5.00 0.02 2.85 0.075.00 0.022.85 0.07 LID5.00 0.392.85 1.12 LID UD & AD1.1210 in PVC 2.0%1.14.3 14.90.00 5.0033 0.09 0.95 5.00 0.08 2.85 0.245.00 0.082.85 0.24 Overflow RD0.2412 in PVC 2.5%0.27.9 486.20.13 5.135.13 0.482.83 1.35 OAK INLET1.3512 in PVC 2.0%1.47.0 105.60.03 5.1644 0.08 0.95 5.00 0.07 2.85 0.215.00 0.072.85 0.2155 0.12 0.88 5.00 0.10 2.85 0.295.00 0.102.85 0.29Pipe Pipe/Swale Travel TimeTOTAL TO LIDTOTAL TO OAK INLETDirect RunoffTotal Runoff Inlets3258c - Rational CalculationsQ MinorPage 8 of 8
Sheet 1 of 2
Designer:
Company:
Date:
Project:
Location:
1. Basin Storage Volume
A) Effective Imperviousness of Tributary Area, Ia Ia =90.0 %
(100% if all paved and roofed areas upstream of rain garden)
B) Tributary Area's Imperviousness Ratio (i = Ia/100)i = 0.900
C) Water Quality Capture Volume (WQCV) for a 12-hour Drain Time WQCV = 0.32 watershed inches
(WQCV= 0.8 * (0.91* i3 - 1.19 * i2 + 0.78 * i)
D) Contributing Watershed Area (including rain garden area) Area = 18,099 sq ft
E) Water Quality Capture Volume (WQCV) Design Volume VWQCV =cu ft
Vol = (WQCV / 12) * Area
F) For Watersheds Outside of the Denver Region, Depth of d6 = in
Average Runoff Producing Storm
G) For Watersheds Outside of the Denver Region, VWQCV OTHER =cu ft
Water Quality Capture Volume (WQCV) Design Volume
H) User Input of Water Quality Capture Volume (WQCV) Design Volume VWQCV USER =481 cu ft
(Only if a different WQCV Design Volume is desired)
2. Basin Geometry
A) WQCV Depth (12-inch maximum)DWQCV =6 in
B) Rain Garden Side Slopes (Z = 4 min., horiz. dist per unit vertical) Z = 0.00 ft / ft
(Use "0" if rain garden has vertical walls)
C) Mimimum Flat Surface Area AMin =326 sq ft
D) Actual Flat Surface Area AActual =1133 sq ft
E) Area at Design Depth (Top Surface Area)ATop =1133 sq ft
F) Rain Garden Total Volume VT=519 cu ft
(VT= ((ATop + AActual) / 2) * Depth)
3. Growing Media
4. Underdrain System
A) Are underdrains provided?1
B) Underdrain system orifice diameter for 12 hour drain time
i) Distance From Lowest Elevation of the Storage y =ft
Volume to the Center of the Orifice
ii) Volume to Drain in 12 Hours Vol12 =cu ft
iii) Orifice Diameter, 3/8" Minimum DO = in
Design Procedure Form: Rain Garden (RG)
EJK
JVA, Inc.
November 18, 2020
Oak 140
140 Oak Street, Fort Collins, CO
UD-BMP (Version 3.07, March 2018)
Choose One
Choose One
18" Rain Garden Growing Media
Other (Explain):
YES
NO
UD-BMP_v3.07, RG 11/18/2020, 9:45 AM
Sheet 2 of 2
Designer:
Company:
Date:
Project:
Location:
5. Impermeable Geomembrane Liner and Geotextile Separator Fabric
A) Is an impermeable liner provided due to proximity
of structures or groundwater contamination?
PROVIDE A 30 MIL (MIN) PVC LINER WITH CDOT CLASS B
GEOTEXTILE ABOVE IT. USE THE SAME GEOTEXTILE BELOW
THE LINER IF THE SUBGRADE IS ANGULAR
6. Inlet / Outlet Control
A) Inlet Control
7. Vegetation
8. Irrigation
A) Will the rain garden be irrigated?
Notes:
Design Procedure Form: Rain Garden (RG)
EJK
JVA, Inc.
November 18, 2020
Oak 140
140 Oak Street, Fort Collins, CO
Choose One
Choose One
Choose One
Sheet Flow- No Energy Dissipation Required
Concentrated Flow- Energy Dissipation Provided
Plantings
Seed (Plan for frequent weed control)
Sand Grown or Other High Infiltration Sod
Choose One
YES
NO
YES
NO
UD-BMP_v3.07, RG 11/18/2020, 9:45 AM