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September 1, 2023
Water Utilities Engineering
City of Fort Collins
700 Wood Street
Fort Collins, Colorado 80522
RE: 3041 South Taft Hill Road Drainage Memo
To Whom it May Concern:
KEEFE CIVIL, INC
3125 Crockett Street
Fort Collins, Colorado 80526
(970) 215-6808
meg@keefecivil.com
Keefe Civil Project Nuinber: 2023-013
Grading/Stormwater Plan Accepted
(Building Permit Released)
Accepted by: sagenbroad
Date: 09/01/2023
The purpose of this letter is to describe the proposed site improveinents and potential drainage
impacts at 3041 South Taft Hill Road (Exhibit A). The 1.49-acre project site is a developed single-
family residential lot with a two-story home and gravel driveway connection between South Taft
Hill Road and Moffett Drive. The lot has established landscaping adjacent to the home and native
grasses east of the house. The site is located on the west side of South Taft Hill Road between
Falcon Drive and Moffett Drive in Fort Collins, Colorado (Figure 1). The site is located within the
Spring Creelc drainage basin.
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3041 South Taft Hill Road Drainage Memo Keefe Civil Project No.: 2023-013
Page 2 of 3 September l, 2023
The lot is bound by existing single-family residential properties on the north, west, and south lot
lines, an undeveloped lot adjacent to the northwest corner of the properiy, and South Taft Hill
Road right-of-way to the east. Earth Engineering Company (2009) completed field investigations
at the site, which included two borings drilled to 20 ft below ground surface (bgs). Groundwater
was observed at 19 ft bgs in one location during investigations and sandy lean clay soils were
observed at the surface and shallow subsurface soils. Per the NRCS Soil Survey of Larimer County
(Exhibit B), the site entirely consists of Altvan-Satanta loams and is classified as being within
hydrologic soil group B. These soils are anticipated to have a moderate infiltration rate when
thoroughly wet and a moderate rate of water transmission.
Per the flood insurance rate map 08069C0986G (effective May 2, 2012), 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 the City of Fort Collins mapped floodplains.
(Exhibit C)
Historically, site stormwater has drained with gentle slopes from the south to the north (historic
basin A), onto the two private lots adjacent to the site. Stonnwater runoff that does not infiltrate
into the native grasses ultimately discharges into Falcon Drive right-of-way to the north. Historic
and developed drainage basins are shown in Exhibit D.
The proposed site iinprovements include a single-story home with an attached recreational vehicle
garage. Based on direction from the City of Fort Collins, any new stonnwater flows must be
directed towards an adequate public outfall (South Taft Hill right-of-way). The grading plan was
developed to direct all proposed impervious areas out to the South Taft Hill Road curb and gutter
via either the gravel driveway or a proposed sidewalk chase near the northeast corner of the lot.
This has resulted in two developed drainage basins. Developed basin A will encompass most of the
project site (1.279 acres), while developed basin B(0.212 acre) will encompass the proposed site
improvements, plus a section of the gravel driveway to be raised to drain east. Landscape retaining
walls are proposed on the north, west, and south sides of the house, which will permit all roof
drains to be collected within drainage swales around the house. A 6-inch storm drainpipe is
proposed underneath the new driveway to route stormwater flows towards the northeast corner of
the lot.
Where possible, impervious areas and downspouts shall be routed into pervious areas with
landscaping to allow for project stormwater infiltration and increased water quality with site
runoff. The lot's total adjusted impervious area will increase 4,122 square feet (s fl per calculations
provided in table below.
Adjusted Adjusted
Overall Site Hardscape or Hai•d Historic Site Historic Developed Developed
Surface Area s Area s Site Area s Area s
Concrete (100%) 335 335 625 625
Roofto (100%) 2,800 2,520 6,290 6,290
Gravel (40%) 6,930 2,772 7,785 3,ll4
Total Im e�vious Area 10,065 5,627 14,700 10,029
Ad'usted Site Im erviousness 4,122
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3041 South Taft Hill Road Drainage Memo Keefe Civil Project No.: 2023-013
Page 3 of 3 September l, 2023
The composite runoff coefficient and drainage basin runoff calculations for the historic and
developed site are included in the enclosed tables (E�ibit E). Using the Fort Collins Stormwater
Criteria Manual (2018), the proposed stormwater runoff from the site is estiinated to decrease
towards the north but increase towards South Taft Hill Road with development as indicated in the
summary table below.
2-year 10-year 100-year
Basin A Historic Runoff 0.61 cfs 1.04 cfs 2.76 cfs
Basin A Developed Runoff 0.55 cfs 0.93 cfs 2.47 cfs
Basin B Developed Runoff 0.32 cfs 0.54 cfs 1.38 cfs
Based on the enclosed design, it is my professional opinion that the additional runoff generated by
these site improvements will not cause adverse impacts to downsiream private properties.
I hereby attest that this letter for the final drainage design for 3041 South Taft Hill Road was
prepared by ine or under iny direct supervision, in accordance with the provisions of the Fort
Collins Stornlwater Criteria Manual. I understand that the Ciry of Fort Collins does not and will
not assume liability for drainage facilities designed by others.
Thank you for the opportunity to submit this drainage memo. Please do not hesitate to reach out
to me if you have any questions or comments regarding the above items.
Best regards, �p,DO L1CF
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VO� .••PN L. ��. �FO
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Megan L. Keefe, PE / Manager Fs- '°'�°�`'� �
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Keefe Civil, Inc. S�ONA�E�
Enclosures
Cc: Ralph Shields, wrkshp inc.
References
Earth Engineering Company. 2009. Geotechnical Subsurface Exploration Report for Lot 2— Tefft
Acres. Project number 09-01-053. June 16, 2009.
Fort Collins Stormwater Criteria Manual. 2018.
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Hydrologic Soil Group—Larimer County Area, Colorado
Hydrologic Soil Group
Map unit symbol � Map unit name
Altvan-Satanta loams, 0 B
to 3 percent slopes
Totals for Area of Interest
Description
Rating
3041 South Taft Hill Road
Acres in AOI Percent of AOI
1.6 100.0%
1.6 100.0%
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
USDn Natural Resources Web Soil Survey 8/16/2023
� Conservation Service National Cooperative Soil Survey Page 3 of 4
Hydrologic Soil Group—Larimer County Area, Colorado
Aggregation is the process by which a set of component attribute values is
reduced to a single value that represents the map unit as a whole.
A map unit is typically composed of one or more "components". A component is
either some type of soil or some nonsoil entity, e.g., rock outcrop. For the
attribute being aggregated, the first step of the aggregation process is to derive
one attribute value for each of a map unit's components. From this set of
component attributes, the next step of the aggregation process derives a single
value that represents the map unit as a whole. Once a single value for each map
unit is derived, a thematic map for soil map units can be rendered. Aggregation
must be done because, on any soil map, map units are delineated but
components are not.
For each of a map unit's components, a corresponding percent composition is
recorded. A percent composition of 60 indicates that the corresponding
component typically makes up approximately 60% of the map unit. Percent
composition is a critical factor in some, but not all, aggregation methods.
The aggregation method "Dominant Condition" first groups like attribute values
for the components in a map unit. For each group, percent composition is set to
the sum of the percent composition of all components participating in that group.
These groups now represent "conditions" rather than components. The attribute
value associated with the group with the highest cumulative percent composition
is returned. If more than one group shares the highest cumulative percent
composition, the corresponding "tie-break" rule determines which value should
be returned. The "tie-break" rule indicates whether the lower or higher group
value should be returned in the case of a percent composition tie. The result
returned by this aggregation method represents the dominant condition
throughout the map unit only when no tie has occurred.
Componenf Percent Cutoff.� None Specified
Components whose percent composition is below the cutoff value will not be
considered. If no cutoff value is specified, all components in the database will be
considered. The data for some contrasting soils of minor extent may not be in the
database, and therefore are not considered.
Tie-break Rule: Higher
The tie-break rule indicates which value should be selected from a set of multiple
candidate values, or which value should be selected in the event of a percent
composition tie.
3041 South Taft Hill Road
USbn Natural Resources Web Soil Survey 8/16/2023
� Conservation Service National Cooperative Soil Survey Page 4 of 4
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