HomeMy WebLinkAboutGrading Plans - 07/05/2023� , J� Felxer F..ngineerinb, LI.0
Grading/Stormwater Plan Accepted
(Building Permit Released)
July 2, 2023
Accepted by: sagenbroad
Date: 07/05/2023
Mr. Dave Veldhuizen
Fort Collins, CO 80521
RE: Drainage Memo
for 416 Stover St, Fort Collins, CO
N 1/2 OF LOT 7, BLK 184, FTC
Dear Dave Veldhuizen;
The purpose of this letter is to describe the proposed site improvements and potential drainage
impacts at 416 Stover Street (Exhibit A). The 0.22-acre project site is a developed single-family
residential lot (parcel no. 9712408006) on the east side of Stover Street between East Mulberry Street
and East Magnolia Street in Fort Collins, Colorado. The site is located within the Old Town drainage basin.
Current conditions at the site include a single-story house, detached garage, concrete patio, concrete
walkways, established trees, and a gravel driveway.
The lot is bound by existing single-family residential properties on the north and south lot lines,
Stover Street right-of-way to the west, and a paved asphalt alley to the east. Per the NRCS Soil Survey of
Larimer County (Exhibit B), the site entirely consists of Fort Collins loam and is classified as being within
hydrologic soil group C. These soils are anticipated to have a slow infiltration rate when thoroughly wet
and a slow rate of water transmission.
Per the flood insurance rate map, the lot is located within Zone X. Zone X is defined as an area of
minimal flood hazard and does not have a base flood elevation associated with it. Also, the site is
outside of all City of Fort Collins mapped floodplains. (Exhibit C)
Historically, site stormwater for the entire site has drained to the east with gentle slopes from the
right-of-way of Stover Street to the alley on the east side. Based on field inspections and additional
topography obtained (Exhibit D), the storm flows drain south and east towards the adjacent Carls Jr lot,
parcel no. 9712408001. Once on this site, all flows go to the southeast inlet in the parking lot. This inlet is
connected to public city owned facilities in East Mulberry Street right-of-way. Historic and developed
drainage basins are shown in Exhibit D. No changes are proposed to the existing drainage pattern of the
site. The proposed site improvements in the drainage basin include a single-story residential structure
with concrete patios and new sidewalk to the existing garage.
Attached is a grading plan (Exhibit D) showing the location of your proposed residential structure and
the grading around this new site improvement. Drainage calcs for the additional storm flows that this
rooftop and site improvements will generate are also attached. All grading around the house (10' min)
shall be a minimum of 5% directed away from the structure and be routed using the existing drainage
308 Jewel Ct, Fort Collins (970) 702-4884
� , J� Fetler �ngineering, L1.0
patterns. All planned downspouts of the new building are located and directed away from the proposed
building and be routed into pervious areas with landscaping to allow for project stormwater to
infiltration into the ground. Additional flows are to follow the same onsite drainage patterns which will
be conveyed to the alley on the east side of the lot which is developed with curb and gutter. This curb and
gutter at the given slope near this property can convey approximately 5.8 cfs without encroachment to
other properties (Exhibit E). The additional flows will utilize this feature and be routed to an inlet on the
adjacent Carl's Jr commercial property on the southeast side. This inlet does discharge to the City owned
stormwater facilities. If inlet capacity is reached in larger storm events, flows will overflow to Mulberry St
with less than 1' of ponding in the parking lot and with no impact to neighboring structures. Since the
lot's total adjusted impervious area increase is below 5,000 square feet (sf�, water quantity detention
requirements are not required for this development. The total site imperviousness is proposed to be 37%
after improvements are completed, which is less than the 50% allowed within the Old Town drainage
basin master plan (ICON Engineering 2017) Due to these developed conditions, it is my professional
opinion that improvements stated in this memo and shown on the grading plan will not negatively impact
downstream private properties adjacent to the alley. Please refer any questions to me at the contact
information provided below. Thank you
Shawn Fetzer, P.E.
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Disclaimer:
This document, together with the concepts and recommendations presented herein, as an instrument of service, is
intended only for the specific purpose and client for which it was prepared. Reuse of and improper reliance on
this document without written authorization from Fetzer Engineering LLC shall be without liability to Fetzer
Engineering LLC
Exhibit Enclosures:
A. Location Map
B. FEMA Map
C. NRCS Soils Report
D. Grading Plans
E. Drainage Calcs
F. Site Pictures
308 Jewel Ct, Fort Collins (970) 702-4884
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NOTES TO USERS
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em(5) SM1own az prwiding prMection for ara'+s on IM1Is panel. T
lootl rlsk in revtlual rrsk arws, property owners and ro'IGen6 are
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Exhibit B
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LEGEND �5
"'�"' INIEIN�DNTION�BV� E�1%� NUnLSCHnNCE��RWpEC
,ai. n9 W u v.. n
zorv[nn ket�usuary areas W pwwing�; eass
' � �EVEE xmesrousEas. cxert[o 'orvEno �,�z�:�aa�.
i cmvee cmtawn �mn �ne tx annua tli
�CI'1'Y OP I�OKTCOLLINS
- nsoioz .�«Ea� a���o� rn� ��ev��,�oo.. �e �F�a E
� � ROODWAY AREAS IN 20NE AE
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n/rs� �J�'>� ��a�a�aoPua���, � w �o�a�������d�.
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MAG SCALE t' =500'
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MEiER!
������ PANEL 0979H
; � FIRM
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PANEL 979 OF 1420
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USDA United States
= Department of
Agriculture
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Natural
Resources
Conservation
Service
Exhibit C
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
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Custom Soil Resource
Report for
Larimer County
Area, Colorado
416 Stover St, Fort Collins
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Preface
Soil surveys contain information that affects land use planning in survey areas.
They highiight 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.nres.usda.gov/wps/
portal/nres/main/soils/health/) and certain conservation and engineering
appiications. For more detailed information, contact your local USDA Service Center
(https://offices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil
Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/?
cid=nres142p2_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 app�icable, 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
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
SoilMap .................................................................................................................. 5
Soil Map (416 Stover St, Fort Collins) .................................................................. 6
Legend..................................................................................................................7
Map Unit Legend (416 Stover St, Fort Collins) .....................................................8
Map Unit Descriptions (416 Stover St, Fort Collins) ............................................. 8
Larimer County Area, Colorado ...................................................................... 10
94—Satanta loam, 0 to 1 percent slopes .................................................... 10
References............................................................................................................12
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
Custom Soil Resource Report
N Soil Map (416 Stover St, Fort Collins)
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Custom Soil Resource Report
MAP LEGEND
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
� _i Soil Map Unit Lines
� Soil Map Unit Points
Special Point Features
V Blowout
� Borrow Pit
�: Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
• Lava Flow
_ Marsh or swamp
' Mine or Quarry
Misceilaneous Water
Perenniai Water
Rock Outcrop
,� Sa�ine Spot
Sandy Spot
= Severely Eroded Spot
Sinkhole
Slide or Slip
oa Sodic Spot
_ Spoil Area
Stony Spot
Very Stony Spot
•� Wet Spot
Other
, Speciai Line Features
Water Features
Streams and Canals
Transportation
� Raiis
�.,,i I�terstate Highways
US Routes
Major Roads
Local Roads
Background
� Aerial Photography
MAP INFORMATION
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 17, Sep 7, 2022
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 2, 2021—Aug 25,
2021
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.
II
Custom Soil Resource Report
Map Unit Legend (416 Stover St, Fort
Collins)
Map Unit Symbol � Map Unit Name � Acres in AOI � Percent of AOI
94 Satanta loam, 0 to 1 percent 0.3 100.0%
slopes
Totals for Area of Interest
0.3 I 100.0%
Map Unit Descriptions (416 Stover St, Fort
Collins)
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 alI 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
E�3
Custom Soil Resource Report
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
Larimer County Area, Colorado
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, descripfions, 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
Properties and qualities
Slope: 0 to 1 percent
Depth to restrictive feature: More than 80 inches
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 content: 10 percent
Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm)
Available water supply, 0 to 60 inches: Very high (about 12.3 inches)
Interpretive groups
Land capability classification (irrigated): 1
Land capability classification (nonirrigated): 2e
Hydrologic Soil Group: C
Ecological site: R072XY111 KS - Sandy Plains
Hydric soil rating: No
10
Custom Soil Resource Report
Minor Components
Nunn
Percent of map unit: 5 percent
Landform: Terraces
Landform position (three-dimensional): Tread
Down-slope shape: Linear
Across-slope shape: Linear
Ecological site: R072XY108KS - Loamy Lowland
Hydric soil rating: No
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: R072XY111 KS - Sandy Plains
Hydric soil rating: No
11
Refe re n ces
American Association of State Highway and Transportation Officials (AASHTO).
2004. Standard specifications for transportation materials and methods of sampling
and testing. 24th edition.
American Society for Testing and Materials (ASTM). 2005. Standard classification of
soils for engineering purposes. ASTM Standard D2487-00.
Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of
wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife
Service FWS/OBS-79/31.
Federal Register. July 13, 1994. Changes in hydric soils of the United States.
Federal Register. September 18, 2002. Hydric soils of the United States.
Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric
soils in the United States.
National Research Council. 1995. Wetlands: Characteristics and boundaries.
Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service.
U.S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/
nres/detail/national/soils/?cid=nres142p2_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. nres. usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577
Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of
Agriculture, Natural Resources Conservation Service. http://
www. nres. usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580
Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and
Delaware Department of Natural Resources and Environmental Control, Wetlands
Section.
United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of
Engineers wetlands delineation manual. Waterways Experiment Station Technical
Report Y-87-1.
United States Department of Agriculture, Natural Resources Conservation Service.
National forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/
home/?cid=nres142p2_053374
United States Department of Agriculture, Natural Resources Conservation Service.
National range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/
detail/national/landuse/rangepasture/?cid=stelprdb1043084
12
Custom Soil Resource Report
United States Department of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 430-VI. http://www.nres.usda.gov/wps/portal/
nres/detail/soils/scientists/?cid=nres142p2_054242
United States Department of Agriculture, Natural Resources Conservation Service.
2006. Land resource regions and major land resource areas of the United States,
the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook
296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/?
cid=nres142p2_053624
United States Department of Agriculture, Soil Conservation Service. 1961. Land
capability classification. U.S. Department of Agriculture Handbook 210. http://
www. nres. usda.gov/I nternet/FSE_DOCUMENTS/nres142p2_052290. pdf
13
Exhibit D
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NO�fES
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J.�HE U�ii�fi[5 SHOwN HEREON ARE GROM NSiBLF. SURFnCE Ev�pENCE AttD FkOM iHE UiiLITY LOCATES_ iHERE MAY 3C
'3URifD UtiLITIES ON OR ADJ4CENf i0 THIS PRCPENIv ?Hql' qRE N01 SHOwN DUE 10 INSUfFIGENi SURFACE EVIDLNCL.
NO STFli:MF.N� i5 MApF CONCERNiNG SJB'>IIRFFlCF CONpIi10�5 04 THE E%ISTENCF OF OVERHEAD OR UN�FRGROUN�
CO�TAINE45 OR FACIL'TES WH�CH M�Y �FGECT iHE �EVELOPlAENT OF iN15 Slit.
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TOTAL — 3590 5�
TOTAL NEi IMPEPNOUSNESS = t098 SF
LEC-END
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OVERFLOW FLOW F'LF:VA?IpN = eg65 80
Exhibit E
Impervious Area / C-coefficient - Existing Basin/Lot
Basin -Existine IE3)
Area of Analyzed Lot (acre) = 0.22
Soil Type Weighted %
(A,B,C/D) Area (SF) Area (AC� % of Site Lot Equivalent % Imperviousness C-Factor Weighted C2 Weighted Q00 Impervious
Buildfngs C/D 1850 0.04 19.47% 0.04 0.9 0.95 0.18 0.18 17.52%
Asphalt/Concrete C/D 642 0.01 6J6% 0.01 1 0.95 0.06 0.06 6J6%
Gravel C/D 230 0.01 2.42% 0.01 0.4 0.50 0.01 0.01 0.97%
Grassland C/D 6781 0.16 7136% 0.16 OA2 0.10 0.07 0.07 1.43%
Total= 9503 0.22 100.00% 0.22 033 033 26.67%
frequency AdjustmeM (2yr = I.O, 100 yr = 1.25) = 1.00 1.25
Pinal GFactor= 033 0.42
Basin -Existine (E1 + Carls 1r.1
Area of Analyzed Lot (acre) = 0.94
Soil Type Weighted %
(A,B,C/D) Area (SF) Area (AC) % of Site Lot Equivaient % Imperviousness GFactor Weighted Q Weighted C100 Impervious
euildings C/D 4570 0.10 1111% 0.10 0.9 095 0.11 0.11 10.00%
Asphalt/Concrete C/D 25368 0.58 61.69% 0.58 1 0.95 0.59 0.59 61.69%
Gravei C/D 230 0.01 0.56% 0.01 0.4 0.50 0.00 0.00 0.22%
Grassland C/D 10954 0.25 26.64% 0.25 OA2 0.10 0.03 0.03 0.53%
Tota�= 41122 0.94 100.00% 0.94 0.72 0.72 72.45%
Frequency AdjustmeM (2yr = I.O, S00 yr = 1.25) = 1.00 1.25
Final GFactor= OJ2 0.90
impervious Area / Gcoefficient - Proposed Basin/Lot
Basin - Pr000sed IP1)
Area of Analyzed Lot (acre) = 0.22
Soil Type Weighted %
(A,B,C/D) Area (SF) Area (AC) % of Site Lot Equivalent % Imperviousness C-Factor Weighted C2 Weighted Q00 Impervious
Buildings C/D 3198 0.07 33.65% 0.07 0.9 0.95 032 032 30.29%
Asphalt/Concrete C/D 394 0.01 4.15% 0.01 1 0.95 0.04 0.04 4.15%
Gravel C/D 230 0.01 2A2% 0.01 0.4 0.50 0.01 0.01 0.97%
Grassland C/D 5681 0.13 59J8% 0.13 OA2 0.10 0.06 0.06 1.20%
Total= 9503 0.22 100.00% 0.22 0.43 0.43 36.60%
frequency Adjustment (2yr = I.O, 100 yr = 1.25) = 1.00 L25
final GFacmr= 0.43 0.54
Basin - Pr000sed IP7 + Carls 1r1
Area of Analyzed Lot (acre) = 0.94
Soil Type Weighted %
(A,B,C/D) Area (SF) Area (AC) % of Site Lot Equivalent % Imperviousness Gfactor Weighted C2 Weighted Q00 Impervious
euildings C/D 5918 0.14 1439% 0.14 0.9 095 0.14 0.14 12.95%
Asphalt/Concrete C/D 25120 0.58 61.09% 0.58 1 0.95 0.58 0.58 61.09%
Gravel C/D 230 0.01 0.56% 0.01 0.4 0.50 0.00 0.00 0.22%
Grassland C/D 9854 0.23 23.96% 0.23 OA2 0.10 OA2 OA2 0.48%
Total= 41122 0.94 432.73% 0.94 0.74 0.74 74.74%
Frequency AdjustmeM (2yr = 1.0, S00 yr = 1.25) = 1.00 1.25
Final GFactor= OJ4 0.93
7�ble 6-3. Recommmded perceurage imp<rciousness calurs
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Otf-site flow anal}zis (a�ben land uu no2 �5
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Pace1 100
Cna�rlipackedl 10
Dm�e and n-alks 90
P.aofs 90
Ianns. sandc so�l
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Site Imperviousness Area
416 Stover St Site Only
Surface Type Historic Proposed Change
Concrete (0.95) 642 394 -248
Rooftop (0.95) 1850 3198 1348
Gravel(0.50) 230 230 0
Total 2492 3592 1100
Imperviousness of Existing Site = 27%
Imperviousness of Proposed Site = 37%
Flowrate Table (Existing Site)
Yr Storm C I(in/hr)* A(ac) 4(cfs)
2-yr 0.33 2.85 0.22 0.21
100-yr 0.42 9.95 0.22 0.91
Flowrate Table (Proposed Improvements)
Yr Storm C I(in/hr)* A(ac) Q(cfs)
2-yr 0.43 2.85 0.22 0.27
100-yr 0.54 9.95 0.22 1.18
416 Stover St Site + Carls Jr South Site
Surface Type Historic Proposed
Concrete (0.95) 25368 25120
Rooftop (0.95) 4570 5918
Gravel (0.50) 230 230
Total 10954 9854
Imperviousness of Existing Site =
Imperviousness of Proposed Site =
Flowrate Table (Existing Site)
Yr Storm C I(in/hr)* A(ac) Q(cfs)
2-yr 0.72 2.85 0.94 1.94
100-yr 0.90 9.95 0.94 8.47
* Tc assumed to be 5 mins
Flowrate Table (Proposed Improvements)
Yr Storm C I(in/hr)* A(ac) 4(cfs)
2-yr 0.74 2.85 0.94 2.00
100-yr 0.93 9.95 0.94 8.73
* Tc assumed to be 5 mins
Change
-248
1348
0
1100
72%
75%
Flowrate Difference Table
Yr Storm Qexisting Qproposed Increase
416 Stover St 2-yr 0.21 0.27 0.06
416 Stover St 100-yr 0.91 1.18 0.27
416 + Carls 2-yr 1.94 2.00 0.06
416 + Carls 100-yr 8.47 8.73 0.27
* Tc assumed to be 5 mins
Channel Analysis (Curb)
ForSpread
n=
Sx
T=
So=
�
0.013
0.01
25 ft
0.003 ft/ft
5.852103 cfs
0.25 ft
Figure 2.2.1-1. Gutter Section with Uniform Cross-Slope
For Depth
n=
Sx
d
So=
Q=
T=
r
TL - ._
�
!
A
0.013
0.01
0.5 ft
0.003 ft/ft
37.15854 cfs
50 ft
For the triangular cross-section shown in the Figure above, flow rate in the gutter can be found using the
Manning's equation, written as:
0.56 SS/3S1/2.r8/3
Q= n x o
Where:
Q= calculated flow rate for the half-street, cfs
n= Manning's roughness coefficient, dimensionless
S„ = street cross-slope, ft/ft
So = street longitudinal slope, ft/ft
T= top width of flow spread, ft
The flow depth can be found using:
y = TSX
Where:
y= flow depth at the gutter flowline, ft
Table 4-3. Manning's n for Street and Pavement Gutters.
Type of Gutter or Pavement
Concrete gutter, troweled finish
Asphalt Pavement:
Smooth texture
Rough texture
Concrete gutter-asphalt pavement:
Smooth
Rough
Concrete pavement:
Float finish
Broom finish
For gutters with small slope, where sediment may accumulate
increase above values of "n" by
Reference: USDOT, FHWA, HDS-3' '
Equation 9-1
Equation 9-2
Manning's n
0.012
0.013
0.016
0.013
0.015
0.014
0.016
0.002
Inlet Analysis
Weir Flow (Equation 3.21)
CW= 3.0
P= 8 ft
Clogging Ratio = 0.5
P w/ Clogging = 4
d= 1.13 ft
Qi= 14.414 cfs
Orfice Flow (Equation 3.22)
Co=
Ag=
Clogging Ratio =
Ag w/ Clogging=
g=
d=
Q� = Cti�.Pd I .s
where
0.67
2.68 sf
0.5
1.34 sf
32.2 ft/sec2
1.13 ft
Inlet Analysis (Wier vs Orfice)
Depth Weir Orfice
0.1 0.379 2.278
0.2 1.073 3.222
0.3 1.972 3.946
0.4 3.036 4.557
0.5 4.243 5.095
0.6 5.577 5.581
0.7 7.028 6.028
0.8 8.587 6.444
0.9 10.246 6.835
1 12.000 7.205
1.1 13.844 7.556
1.2 15.774 7.892
Qi= 7.659 cfs *Using Inlet Grate from MAG Standard 539
(3.21)
CW = Weir coeffcient = 3.0
P= Perimeter of the grate, disregarding bars and side against
curb, ft
d= Depth of flow at curb, ft
pl = C�.AQ(2gd)Q.5
where: Ca = Orifice coefficient = 0.67
A9 = Clear opening area of the grate, sq ft
d= Depth of flow at curb, ft
g = Gravity, 32.2 ft/sec2
(3.22)
Exhibit F
Site Pictures
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