HomeMy WebLinkAboutBREEZE THRU HEADQUARTERS - FDP190003 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE RELATED DOCUMENTCorporate Headquarters
112 N. Rubey Drive
Golden, Colorado 80403
Ph 303.940.9966
Fax 303.940.9959
Northern Colorado
4007 S. Lincoln Avenue, Suite 405
Loveland, Colorado 80537
Ph 970.353.7600
Fax 866.242.9106
Denver
3001 Brighton Boulevard, Suite 651
Denver, Colorado 80216
Ph 303.940.9966
Fax 303.940.9959
Rocky Mountains
419 Oak Street, PO Box 770152
Steamboat Springs, Colorado 80477
Ph 970.879.1825
Fax 866.242.9106
02/06/2018
City of Fort Collins
Engineering
281 North College Avenue
Fort Collins, CO 80524
RE: 6464 South College Avenue
Breeze Thru Headquarters
Drainage Conformance Letter
This letter and the accompanying appendices are presented for verification that the proposed
improvements to this project site are in conformance with Fort Collins storm drainage criteria and
specifications. The proposed improvements for this site consist of the vertical expansion of an
existing structure to provide 10 new apartments as well as the addition of a 2400sqft, detached
garage and access drive in the northeast corner of the site. In the area directly west of the existing
structure, the asphalt will be removed with limited regrading to accommodate a grassed frontage
area. The area directly south of the new structure will be regraded slightly to allow for the new
access drive. The existing parking lot will also require minor regrading to bring existing ADA stalls
up to current standards. Several landscape islands will be added to the parking area as well.
Runoff from the new structure will be routed via roof drains and a trench drain to a water quality
LID grassed lined linear bioretention swale that runs north along the east side of the structure to
the northeast property corner. Runoff from the new access drive will also be routed to the grass
swale via a curb cut and trench drain. See the grading / drainage plan and appendices for
calculations and further information on new site runoff and water quality treatment. Historically
roof flows are collected through gutters and are dispersed into the parking area through roof
drains. Site runoff then travels southwest to northeast overland and is ultimately conveyed to a
drainage way to the east of the site. Stormwater is conveyed north in this drainage way to the
Fossil Creek Drainage Basin. Runoff from the existing structure and parking area will maintain
historic drainage patterns for the site. The overall imperviousness for this site has been reduced
from 83% to 78%. The added area of imperviousness is 0.07 acres and the area of contributing
runoff to the linear bioretention is 0.29 acres.
Because this site’s overall imperviousness has been reduced, new runoff has been accounted for
and treated, and historic drainage patterns have been maintained, no additional improvements to
the drainage infrastructure are required for the development of this site other than that which is
proposed within this drainage conformance package and accompanying plans.
Baseline Engineering Corp
Noah Nemmers, PE
Colorado PE No. 39820
VICINITY MAP
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
Natural Area, Colorado
Resources
Conservation
Service
June 28, 2018
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
36—Fort Collins loam, 3 to 5 percent slopes.............................................. 10
49—Heldt clay loam, 3 to 6 percent slopes................................................. 11
63—Longmont clay, 0 to 3 percent slopes.................................................. 12
65—Midway clay loam, 5 to 25 percent slopes........................................... 13
References............................................................................................................15
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
4482860 4482880 4482900 4482920 4482940 4482960
4482860 4482880 4482900 4482920 4482940 4482960
493450 493470 493490 493510 493530 493550 493570 493590 493610
493450 493470 493490 493510 493530 493550 493570 493590 493610
40° 29' 50'' N
105° 4' 38'' W
40° 29' 50'' N
105° 4' 31'' W
40° 29' 46'' N
105° 4' 38'' W
40° 29' 46'' N
105° 4' 31'' W
N
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 40 80 160 240
Feet
0 10 20 40 60
Meters
Map Scale: 1:847 if printed on A landscape (11" x 8.5") 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
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
36 Fort Collins loam, 3 to 5 percent
slopes
1.4 38.3%
49 Heldt clay loam, 3 to 6 percent
slopes
1.3 35.9%
63 Longmont clay, 0 to 3 percent
slopes
0.0 0.0%
65 Midway clay loam, 5 to 25
percent slopes
1.0 25.8%
Totals for Area of Interest 3.7 100.0%
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.
Custom Soil Resource Report
8
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,
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
36—Fort Collins loam, 3 to 5 percent slopes
Map Unit Setting
National map unit symbol: jpw9
Elevation: 4,800 to 5,500 feet
Mean annual precipitation: 13 to 15 inches
Mean annual air temperature: 48 to 50 degrees F
Frost-free period: 135 to 150 days
Farmland classification: Prime farmland if irrigated
Map Unit Composition
Fort collins and similar soils: 90 percent
Minor components: 10 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Fort Collins
Setting
Landform: Terraces, fans
Landform position (three-dimensional): Base slope, riser
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Alluvium
Typical profile
H1 - 0 to 9 inches: loam
H2 - 9 to 20 inches: loam, clay loam
H2 - 9 to 20 inches: loam, silt loam, fine sandy loam
H3 - 20 to 60 inches:
H3 - 20 to 60 inches:
H3 - 20 to 60 inches:
Properties and qualities
Slope: 3 to 5 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 (0.60 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: 15 percent
Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 2.0
mmhos/cm)
Available water storage in profile: Very high (about 25.5 inches)
Interpretive groups
Land capability classification (irrigated): 3e
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: B
Ecological site: Loamy Plains (R067XY002CO)
Hydric soil rating: No
Custom Soil Resource Report
10
Minor Components
Ascalon
Percent of map unit: 5 percent
Hydric soil rating: No
Kim
Percent of map unit: 3 percent
Hydric soil rating: No
Stoneham
Percent of map unit: 2 percent
Hydric soil rating: No
49—Heldt clay loam, 3 to 6 percent slopes
Map Unit Setting
National map unit symbol: jpwr
Elevation: 4,800 to 5,500 feet
Mean annual precipitation: 13 to 15 inches
Mean annual air temperature: 48 to 50 degrees F
Frost-free period: 135 to 150 days
Farmland classification: Farmland of statewide importance
Map Unit Composition
Heldt and similar soils: 85 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Heldt
Setting
Landform: Valley sides, fans
Landform position (three-dimensional): Base slope
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Clayey alluvium derived from shale
Typical profile
H1 - 0 to 4 inches: clay loam
H2 - 4 to 60 inches: silty clay, clay loam, clay
H2 - 4 to 60 inches:
H2 - 4 to 60 inches:
Properties and qualities
Slope: 3 to 6 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: Very high
Capacity of the most limiting layer to transmit water (Ksat): Moderately low to
moderately high (0.06 to 0.20 in/hr)
Custom Soil Resource Report
11
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum in profile: 10 percent
Gypsum, maximum in profile: 5 percent
Salinity, maximum in profile: Nonsaline to moderately saline (0.0 to 8.0
mmhos/cm)
Sodium adsorption ratio, maximum in profile: 10.0
Available water storage in profile: Very high (about 27.6 inches)
Interpretive groups
Land capability classification (irrigated): 4e
Land capability classification (nonirrigated): 4e
Hydrologic Soil Group: C
Hydric soil rating: No
Minor Components
Renohill
Percent of map unit: 8 percent
Hydric soil rating: No
Ulm
Percent of map unit: 7 percent
Hydric soil rating: No
63—Longmont clay, 0 to 3 percent slopes
Map Unit Setting
National map unit symbol: jpx8
Elevation: 4,800 to 5,800 feet
Mean annual precipitation: 13 to 15 inches
Mean annual air temperature: 48 to 50 degrees F
Frost-free period: 135 to 150 days
Farmland classification: Prime farmland if irrigated and reclaimed of excess salts
and sodium
Map Unit Composition
Longmont and similar soils: 85 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Longmont
Setting
Landform: Valleys, flood plains
Landform position (three-dimensional): Base slope, tread
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Clayey alluvium derived from shale
Custom Soil Resource Report
12
Typical profile
H1 - 0 to 60 inches: clay
Properties and qualities
Slope: 0 to 3 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Poorly drained
Runoff class: High
Capacity of the most limiting layer to transmit water (Ksat): Moderately low to
moderately high (0.06 to 0.20 in/hr)
Depth to water table: About 24 to 30 inches
Frequency of flooding: Occasional
Frequency of ponding: None
Calcium carbonate, maximum in profile: 15 percent
Gypsum, maximum in profile: 5 percent
Salinity, maximum in profile: Slightly saline to strongly saline (4.0 to 16.0
mmhos/cm)
Sodium adsorption ratio, maximum in profile: 20.0
Available water storage in profile: Moderate (about 8.4 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 6w
Hydrologic Soil Group: D
Ecological site: Salt Meadow (R067BY035CO)
Hydric soil rating: No
Minor Components
Heldt
Percent of map unit: 5 percent
Hydric soil rating: No
Dacono
Percent of map unit: 5 percent
Hydric soil rating: No
Aquolls
Percent of map unit: 5 percent
Landform: Swales
Hydric soil rating: Yes
65—Midway clay loam, 5 to 25 percent slopes
Map Unit Setting
National map unit symbol: jpxb
Elevation: 4,800 to 5,800 feet
Mean annual precipitation: 13 to 15 inches
Mean annual air temperature: 48 to 50 degrees F
Frost-free period: 135 to 150 days
Farmland classification: Not prime farmland
Custom Soil Resource Report
13
Map Unit Composition
Midway and similar soils: 90 percent
Minor components: 10 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Midway
Setting
Landform position (three-dimensional): Side slope
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Material weathered from shale
Typical profile
H1 - 0 to 4 inches: clay loam
H2 - 4 to 19 inches: clay, clay loam, silty clay loam
H2 - 4 to 19 inches: weathered bedrock
H2 - 4 to 19 inches:
H3 - 19 to 23 inches:
Properties and qualities
Slope: 5 to 25 percent
Depth to restrictive feature: 6 to 20 inches to paralithic bedrock
Natural drainage class: Well drained
Runoff class: Very high
Capacity of the most limiting layer to transmit water (Ksat): Moderately low to
moderately high (0.06 to 0.20 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum in profile: 15 percent
Gypsum, maximum in profile: 15 percent
Salinity, maximum in profile: Very slightly saline to moderately saline (2.0 to 8.0
mmhos/cm)
Sodium adsorption ratio, maximum in profile: 15.0
Available water storage in profile: Moderate (about 7.9 inches)
Interpretive groups
Land capability classification (irrigated): 6e
Land capability classification (nonirrigated): 6e
Hydrologic Soil Group: D
Ecological site: Shaly Plains (R067BY045CO)
Hydric soil rating: No
Minor Components
Renohill
Percent of map unit: 10 percent
Hydric soil rating: No
Custom Soil Resource Report
14
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
15
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
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= FORMULA CELLS
= USER INPUT CELLS
PROJECT:
JOB NO.:
CALC. BY: ▼
DATE:
▼ ▼
Minutes
5
10
20
30
40
50
60
120
Equation 5-1 I=(28.5*P1
)/(10+Td
)
^0.786
I = rainfall intensity (inches per hour)
P1
= 1-hour point rainfall depth (inches)
Td
= storm duration (minutes)
Reference:
1) Urban Drainage and Flood Control District - Urban Storm Drainage Criteria Manual Volume 1, 2017
2) Town of Gypsum, Public Works Manual, September 2015
http://hdsc.nws.noaa.gov/hdsc/pfds/pfds_map_cont.html?bkmrk=co
60.00 60.00
9.95
7.72
5.60
4.52
3.74
3.18
2.85
2.21
1.61
1.30
1.07
0.92
0.82
FORT COLLINS, CO
Project Location
P1: 1-hour Rainfall Depths (inches)
BREEZE THRU HQ
PL375
JKC
2/5/2019
IDF Rainfall Data
2-Year
Minor Storm Major Storm
Td 100-Year
0.49 1.84
2.86
Baseline Engineering,
Planning and Surveying
2/5/2019
Copy of PL375_Breeze Thru_SF2 SF3_2018-08-31.xlsx
PROJECT:
JOB NO.:
CALC. BY:
DATE:
Impervious Percentages - from Urban Drainage Table 6-3
Paved 100% 20%
Drive and
walks
100% 40%
Roofs 90% 0
Lawns, sandy
soil
10% 0
SOIL TYPE: C or D q (use equation from Table 6-4) = FORMULA CELLS
= USER INPUT CELLS
Basin Area (ac) Imp. C2 C5 C25 C100 Paved
Drive and
walks
Roofs
Lawns, sandy
soil
Lawns, clayey
soil
Gravel
(packed)
Land Use Land Use
HISTORIC 1.56 83% 0.67 0.71 0.84 0.82 0.84 0.09 0.22 0.41
PROPOSED 1.56 78% 0.62 0.67 0.81 0.80 0.79 0.11 0.27 0.30 0.09
IMPRVMNTS 0.07 92% 0.76 0.79 0.90 0.86 0.01 0.06
Weighted Impervious and C Values Areas (ac)
Lawns, clayey
soil
Gravel
(packed)
Land Use
Land Use
PROPOSED COMPOSITE IMPERVIOUSNESS
Breeeze Thru
PL375
JKC
8/31/2018
Baseline Engineering,
Planning and Surveying COMPOSITE C VALUES - PROP
2/5/2019
Copy of PL375_Breeze Thru_SF2 SF3_2018-08-31.xlsx
Project: Breeeze Thru
Job No.: PL375
Calculated By: Checked By: N. Nemmers
Date:
FINAL REMARKS
tc
Basin i C5 AREA LENGTH SLOPE ti LENGTH SLOPE VEL. tt COMP. TOT. LENGTH So
Ac Ft % Min Ft % FPS Min tc Ft % Min Min
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16)
HISTORIC 0.83 0.71 1.56 5.00
PROPOSED 0.78 0.67 1.56 5.00
IMPRVMNTS 0.92 0.79 0.07 5.00
5.00
STANDARD FORM SF-2
INITIAL/OVERLAND
TIME (ti
)
JKC
DATA
SUB-BASIN
8/31/2018
tc (Equation 6-5)
TIME OF CONCENTRATION SUMMARY
tc
CHECK
(URBANIZED BASINS)
TRAVEL TIME
(tt
)
Cv
Baseline Engineering,
Planning and Surveying TOC
2/5/2019
Copy of PL375_Breeze Thru_SF2 SF3_2018-08-31.xlsx
Calculated By: Project: Breeeze Thru
Date: Job No.: PL375
Checked By: Design Storm: 2-Year
= FORMULA CELLS
= USER INPUT CELLS
DESIGN
POINT
AREA
DESIGN
AREA
(AC)
RUNOFF
COEFF
tc
(MIN)
C * A
(AC)
I
(IN/HR)
Q
(CFS)
tc
(MIN)
S (C * A)
(CA)
I
(IN/HR)
Q
(CFS)
SLOPE
(%)
STREET
FLOW
DESIGN
FLOW (CFS)
SLOPE
(%)
PIPE DIAM.
(IN.)
(2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21) (22)
HISTORIC 1.56 0.84 5.0 1.31 2.78 3.65
PROPOSED 1.56 0.81 5.0 1.26 2.78 3.50
IMPRVMNTS 0.07 0.90 5.0 0.06 2.78 0.17
STANDARD FORM SF-3
STORM DRAINAGE SYSTEM DESIGN
(RATIONAL METHOD PROCEDURE)
JKC
8/31/2018
NN
2-Year
0.82
1-hour rainfall=
VELOCITY
(FPS)
tt
(MIN)
BASIN REMARKS
DIRECT RUNOFF TOTAL RUNOFF STREET PIPE
LENGTH
(FT)
Calculated By: Project: Breeeze Thru
Date: Job No.: PL375
Checked By: Design Storm: 100-Year
= FORMULA CELLS
= USER INPUT CELLS
DESIGN
POINT
AREA
DESIGN
AREA
(AC)
RUNOFF
COEFF
tc
(MIN)
C * A
(AC)
I
(IN/HR)
Q
(CFS)
tc
(MIN)
S (C * A)
(CA)
I
(IN/HR)
Q
(CFS)
SLOPE
(%)
STREET
FLOW
DESIGN
FLOW (CFS)
SLOPE
(%)
PIPE DIAM.
(IN.)
(2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21) (22)
HISTORIC 1.56 0.82 5.0 1.29 9.70 12.5
PROPOSED 1.56 0.80 5.0 1.25 9.70 12.1
IMPRVMNTS 0.07 0.86 5.0 0.06 9.70 0.6
JKC
STANDARD FORM SF-3
STORM DRAINAGE SYSTEM DESIGN
(RATIONAL METHOD PROCEDURE)
BASIN
PIPE
8/31/2018
NN
2.86
100-Year
1-hour rainfall=
tt
(MIN)
REMARKS
DIRECT RUNOFF TOTAL RUNOFF STREET
LENGTH
(FT)
PROJECT : PROJECT LOCATION: Fort Collins, CO DATE :
PROJECT NO. : BY :
Required Volume 1‐Hour Rainfall
Tributary Area (ac) % Impervious Depth (100‐yr) Basin Slope (%) Basin Length (ft)
0.29 40.4% 2.86 3.0% 25.00
Soil Type % : A = 0.0% B = 0.0% C&D=
100.0%
WQCV = 0.00 ac‐ft ( WQCV = 1.0*A*(0.91i 3 ‐1.19i 2 +0.78i)/12 )
WQCV = 192 cu‐ft
Total Required Volume = 0.004 ac‐ft (V100)
= 192 cu‐ft
Breeze Thru 2/5/2019
PL375 J. Carano
Water Quality Capture Volume Calculations
Sheet 1 of 1
Designer:
Company:
Date:
Project:
Location:
1. Design Discharge for 2-Year Return Period Q2
= 0.24 cfs
2. Hydraulic Residence Time
A) : Length of Grass Swale LS
= 85.0 ft
B) Calculated Residence Time (based on design velocity below) THR
= 7.1 minutes
3. Longitudinal Slope (vertical distance per unit horizontal)
A) Available Slope (based on site constraints) Savail
= 0.050 ft / ft
B) Design Slope SD
= 0.005 ft / ft
4. Swale Geometry
A) Channel Side Slopes (Z = 4 min., horiz. distance per unit vertical) Z = 4.00 ft / ft
B) Bottom Width of Swale (enter 0 for triangular section) WB
= 3.00 ft
5. Vegetation
A) Type of Planting (seed vs. sod, affects vegetal retardance factor)
6. Design Velocity (0.283 ft / s maximum for desirable 5-minute residence time) V2
= 0.20 ft / s
7. Design Flow Depth (1 foot maximum) D2
= 0.29 ft
A) Flow Area A2
= 1.2 sq ft
B) Top Width of Swale WT
= 5.3 ft
C) Froude Number (0.50 maximum) F = 0.07
D) Hydraulic Radius RH
= 0.22
E) Velocity-Hydraulic Radius Product for Vegetal Retardance VR = 0.04
F) Manning's n (based on SCS vegetal retardance curve D for sodded grass) n = 0.200
G) Cumulative Height of Grade Control Structures Required HD
= 3.80 ft
AN UNDERDRAIN IS
8. Underdrain REQUIRED IF THE
(Is an underdrain necessary?) DESIGN SLOPE < 2.0%
9. Soil Preparation
(Describe soil amendment)
10. Irrigation
Notes:
Design Procedure Form: Grass Swale (GS)
J. Carano
Baseline Engineering
February 5, 2019
Breeze Thru HQ
South College Ave, Fort Collins, CO
UD-BMP (Version 3.07, March 2018)
Choose One
Temporary Permanent
Choose One
Grass From Seed Grass From Sod
Choose One
YES NO
PL375_Breeze Thru_UD-BMP_v3.07_2018-08-31.xlsm, GS 2/5/2019, 12:20 PM
VELOCITY
(FPS)
Baseline Engineering,
Planning and Surveying Major SF-3
2/5/2019
Copy of PL375_Breeze Thru_SF2 SF3_2018-08-31.xlsx
Baseline Engineering,
Planning and Surveying Minor SF-3
2/5/2019
Copy of PL375_Breeze Thru_SF2 SF3_2018-08-31.xlsx
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 12, Oct 10, 2017
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Mar 20, 2015—Oct
15, 2016
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