HomeMy WebLinkAboutDrainage Reports - 11/03/2022kimley-horn.com 3801 Automation Way, Suite 210, Fort Collins, CO 80525 303 228 2300
September 23, 2022
Dan Mogen
Development Review Engineer
281 North College Avenue
PO Box 580
Fort Collins, CO 80522
RE:Krispy Kreme – 4624 Mason Street
Drainage Narrative
Dear: Mr. Mogen
We are providing a detailed memorandum showing the increase in impervious area and drainage
design for the proposed site and comparing it to the existing site conditions.
This drainage narrative provides a summary of the existing and proposed drainage conditions
associated with the proposed Krispy Kreme building at 4624 Mason Street located on a .781-acre
parcel. The existing site is stabilized by the existing building, parking lot, drive-thru aisles, and
landscape area. The project area is anticipated to disturb ±0.36 acres. This disturbed area is also
detailed on the submitted Minor Amendment plans and included in the attached Exhibit A – Proposed
Drainage Map of this letter. Table 1 below is a summary of the anticipated areas and Table 2 below is
a summary of the Impervious areas:
Impervious Area Information – 4624 Mason Street
Site Basin Area
Existing Drainage Basin Pavement & Roof Area
(Impervious Area)30,500 Square Feet (0.70 Acres)
Proposed Drainage Basin Pavement & Roof Area
(Impervious Area)31,447 Square Feet (0.72 Acres)
Change in Impervious Area 947 Square Feet (0.02 Acres)
Table 1: Impervious Area Information (See Exhibit C for full calculations)
Statistical Site Information – 4624 Mason Street
Gross Project Area: 34,020 Square Feet (0.78 Acres)
Proposed Building Area: 3,592 Square Feet (0.08 Acres)
Total Disturbed Area: 15,777 Square Feet (0.36 Acres)
Table 2: Statistical Site Information
City of Fort Collins Approved Plans
Approved by:
Date:
Dan Mogen
11/03/2022
Page 2
kimley-horn.com 3801 Automation Way, Suite 210, Fort Collins, CO 80525 303 228 2300
The increase impervious area for the entire site is 947 Square Feet (SF). This increase in impervious
area is due to the addition of the existing building expansion (185 SF) and updates for truck unloading
area which removes an existing landscape area. In the existing condition, 8.77 cubic feet per second
(CFS) flows downstream from the project area in the 100-year storm event. Runoff flow is increased by
0.14 CFS in the proposed condition for the 100-year storm event to 8.91 CFS. The project site was
previously studied by Adam-Avery, LTD. with a written Final Drainage Report approved 12/07/1995
(See Exhibit D). The project is intended to upgrade the building and site to fit the needs of the proposed
tenant.
Basin A historically includes the building, drive thru land and all parking on the north side of the site.
Runoff historically flows overland towards a 8’x6’ box inlet with a slotted manhole located in the
northeast portion of the site. The existing inlet connects to existing public infrastructure. Proposed flows
follow historic flows by conveyance through existing curb/gutter and a proposed 2’ wide pan to existing
8’x6’ box inlet with a slotted manhole. The additional 0.14 CFS is proposed to go to this inlet in the 100-
year storm. The existing slotted manhole can hold capacity for the minor storm. For the major storm
the spillway is East of the inlet onto College Ave.
Basin B historically includes south side of the parking area. The study encompasses the full property
limits. Historically, this basin drains towards an existing sump inlet located on the parking bay south of
the site. Limited disturbance is anticipated in this basin, proposed changes include removing and
adding landscape islands, stump removal, and proposed tree additions. Equivalent runoff coefficients
for existing and proposed conditions are calculated in Exhibit C. Ultimately the flows end up within an
existing 18-inch RCP storm sewer pipe that conveys runoff to the Mail Creek 8’X8’ box culvert
historically.
In conclusion, the added runoff from the added building square footage and impervious area is not
anticipated to negatively impact the existing site or sites upstream and downstream of the site.
Please contact us with any questions or concerns.
Thank You,
KIMLEY-HORN AND ASSOCIATES, INC.
Emily Felton, P.E.
Appendices
A – Existing Drainage Map
B – Proposed Drainage Map
C – Rational Method Calculations
D – Existing Master Report
.
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EXHIBIT A — Existing Drainage Map
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EXHIBIT B – Proposed Drainage Map
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EXHIBIT C — Rational Method Calculations
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196131002 Krispy Kreme 9�19�2�22
Fort Collins, CO Prepared By: HPC
Checked By: EPF
Rainfall Intensity
Time Intensity Frequency Tabulation
TIME 2 YR 10 YR 100 YR
5 2.85 4.87 9.95
6 2.67 4.56 9.31
7 2.52 4.31 8.80
8 2.40 4.10 8.38
9 2.30 3.93 8.03
10 2.21 3.78 7.72
11 2.13 3.63 7.42
12 2.05 3.50 7.16
13 1.98 3.39 6.92
14 1.92 3.29 6.71
15 1.87 3.19 6.52
20 1.61 2.74 5.60
25 1.43 2.44 4.98
30 1.30 2.21 4.52
40 1.07 1.83 3.74
50 0.92 1.58 3.23
60 0.82 1.40 2.86
120 0.49 0.86 1.84
Note: Intensity values from the City of Fort Collins Intensity-Duration-Frequency Tables; Chapter 5,
Section 3.4 of the Fort Collins Stormwater Criteria Manual, 2018 Edition.
Runoff Coefficients
Ta61e 3.2-2.Surface Type-Runafi Coeffiicients Tahle 3.23. Freqliency Adjustment Factars
Surface T Runaff Coefficients Sturm Return Periad Frequency Adjustment
Hardscape ar Hard Surface [years} Factor fC�)
Asp3�alt,Contrete 0.55 2,5, l0 I.OU
Roofto p �.95 �5 f.14
Retytled Asphaft 0.84 50 2_2d
G ra+�e f 0.5U 104 I.ZS
P a ve rs 0_50
Landstape ar Perviaus Sur#ace - ;
Lawns,Sandy Sail,Flat Slope t Z% 0_10 __�_: �. : �
Lawns,Sandy SQiI,A�g SIQpe�-79'd ❑.15 --�"iNOT ExcEEo THE
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Lawns,Sandy 5oil,Steep 54ope�7% 0.2U
Lawns,Clayey Soil,FIaS Slope�2% ❑.2U
Lawns,Cla e Saii,Flv Sfope 2-73'0 0.25
Lawns,Clayey Saii,5teep Slope�7� 0.35
Note: Runoff Coefficient values are from the City of Fort Collins Runoff Coefficient Tables 3.2-2 and 3.2-
3; Chapter 5, Section 3.2 of the Fort Collins Stormwater Criteria Manual, 2018 Edition.
K:\NCO_Civil\196131002_KK Fort CollinS�Project Files\Eng\Drainage\Calc\Imperviousness and C Values.xls
196131002 Krispy Kreme 9i�9i2°zz
Fort Collins,CO Prepared By: HPC
Checked By: EPF
Existing Imperviousness and Runoff Coefficient Calculations
Basin A-EX Area(sf) Basin% I CZ Cio Cioo
Lawns 7,748 27% 2% 0.20 0.20 0.25
Rooftop 3,592 12% 90% 0.95 0.95 1.00
Asphalt,Concrete 17,557 61% 100°/ 0.95 0.95 1.00
28,897 100% 72% 0.75 0.75 0.94
BasinB-EX Area(sf) Basin% I CZ Cio Cioo
Lawns 2,000 18% 2% 0.20 0.20 0.25
Rooftop 0 0% 90% 0.95 0.95 1.00
Asphalt,Concrete 9,351 82% 100% 0.95 0.95 1.00
11,351 100% S3% 0.82 0.82 1.00
Proposed Imperviousness and Runoff Coefficient Calculations
Basin A-PR Area(sf) Basin% I CZ Cio �ioo
Lawns 7,105 25% 2% 0.20 0.20 0.25
Rooftop 3,571 12% 90% 0.95 0.95 1.00
Asphalt,Concrete 18,221 63% 100% 0.95 0.95 1.00
28,897 100% 75% 0.77 0.77 0.96
Basin B-PR Area(sf) Basin% I CZ Cio �ioo
Lawns 1,696 15% 2% 0.20 0.20 0.25
Rooftop 0 0% 90% 0.95 0.95 1.00
Asphalt,Concrete 9,655 85% 100% 0.95 0.95 1.00
11,351 100% 85% 0.84 0.84 1.00
Notes:
1. Imperviousness,I,values per UDFCD Criteria Manual Volume 1,Table 6-3
2. Runoff Coefficient values are from the City of Fort Collins Runoff Coefficient Tables 3.2-2 and 3.2-3;Chapter
5,Section 3.2 of the Fort Collins Stormwater Criteria Manual,2018 Edition.Frequency adjustment factors were
used for the 100-year runoff coefficient utilizing Table 3.2-3.
3.Soil is Altvan-Satanta loams with mostly Clay Loam soils of the Hydrologic Soil Group B per Web Soil Survey.
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196131002 Krispy Kreme 9/19/2022
Fort Collins,CO Prepared By: HPC
Existin Imperviousness and Runoff Coefficient Summa Checked By: EPF
DESIGN DRAIN AREA %of Site I WEIGHTED Impervious �2 Cioo
POINT BASIN (AC) (%) (%) (%) Area (Ac)
Basin A-EX Basin A-EX 0.66 72% 72% 52.0% 0.48 0.75 0.94
Basin B-EX Basin B-EX 0.26 28% 83% 23.3% 0.22 0.82 1.00
TOTAL 0.92 75.4% 0.70
Proposed Imperviousness and Runoff Coefficient Summa
DESIGN DRAIN AREA %of Site I WEIGHTED Impervious �2 Cioo
POINT BASIN (AC) (%) (%) (%) Area (Ac)
Basin A-PR Basin A-PR 0.66 72% 75% 53.6% 0.50 0.77 0.96
Basin B-PR Basin B-PR 0.26 28% 85% 24.1% 0.22 0.84 1.00
TOTAL 0.92 77.7% 0.72
K:\NCO_Civil\196131002_KK Fort Collins�Project Files\Eng\Drainage\Calc\Imperviousness and C Values.xls
196131002 Krispy Kreme 9/19/2022
Fort Collins CO Prepared By: HPC
� Checked By: EPF
Existing Direct Runoff Summary
Standard Rational Method
DESIGN DRAIN AREA QZ Q�oo
POINT BASIN (AC) (CFS) (CFS)
Basin A- EX Basin A- EX 0.66 1.29 6.18
Basin B- EX Basin B- EX 0.26 0.61 2.59
1.90 8.77
Proposed Direct Runoff Summary
Standard Rational Method
DESIGN DRAIN AREA QZ Q�oo
POINT BASIN (AC) (CFS) (CFS)
Basin A- PR Basin A- PR 0.66 1.32 6.32
Basin B- PR Basin B- PR 0.26 0.62 2.59
1.94 8.91
K:\NCO_Civil\196131002_KK Fort Collins�Project Files\Eng\Drainage\Calc\Imperviousness and C Values.xls
.
Kim ey>>> Horn Page 6
EXHIBIT D — Existing Master Report
- . . :� � . . . - � . . • :� � ��
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FINAt URAI!��,GE RE�OR�
��►��L�'� �E��A�R�►��
Arbor Plaza Shopping Center
Fort Coliins, Co�orado
�
� Final Drainage Report
�
FAZOLI'S RESTAURANT
� Arbor Plaza Shopping Center
Fort Collins, Colorado
�.
� Prepared for:
INTERPLAN PRACTICE LTD.
� 933 Lee Road, Suite 120
Orlando, Florida 32810
Telephone: {4Q7) 645-5008
�
�
� November 6, 1995
� �
1
.�
�'
�
Prepared by:
, ADAMS-AVERY, LTD.
1380 Lawrence Street - Suite 870
Denver, Colorado 80204
� Telephone: (303) 820-4454
�
�
his unofficial copy was downloaded on Jan-04-2022 from the City of Fort Collins Public Records Website:http://citydocs.fcgov.com
or additional informarion or an official copy,please contact City of Fort Collins Urilities 700 Wood Street Fort Collins,CO 80524 USA
'
� FINAL DRAINAGE STUDY
FOR
� FAZOLI'S AT ARBOR PLAZA P.U.�.
� I. General Location and Description
The Fazoli's praject is located in the northeast quarter of section 2, township 6 north, range
, 69 west of the 6th principal meridian, City of Fort Collins, County of Larimer, State of
� Colorado. The site is bounded by South College Avenue on the east, Ethan Allen on the south,
undeveloped land of Arbor Plaza P.U.D. on the west, and Soundtrack on the north. The project
� covers 0.83 acres which is currently undeveloped: Recent construction has installed a box
culver# across the site to convey Mail Creek flows under the Arbor Plaza improvements.
Completion of the box culvert pro�ect included filling the site to accommodate the Fazoli's
improvements. There are no irrigation facilities in evidence on the site. Mail Creek is a major
� drainage within the city.
� II. Drainage Criteria
The conclusions of this Final Drainage Study are based on the criteria presented in the City of
� Fort Collins Storm Drainage Design Criteria and Construction Standards, May 1994.
Developed runoff was calculated using the rational method for the 10-year and 100-year
events. Since the project lies immediately adjacent to Mail Creek no detention is being
� provided for this site.
� III. Drainage Basins
� The developed lots which are a portion of Arbor Plaza have installed storm sewer facilities
which convey site runoff from the respective site to Mail Creek drainage. The box culvert
construction rnentioned above connected the individua� storm sewers to the box culvert. The
� only off-site area upstream of the site which does not have existing drainage facilities is the
undeveloped parcel west of the site. Runoff from this area is negligible at this time due to the
exisiing pervious surface and small area. The site area will be divided into three sub basins.
� Basin A covers 0.34 acres on the south side of the parking area. This basin is partly covered
with existing asphalt being used for parking by Ethan Allen. Basin A will drain towards an
� existing sump inlet located on parking bay south of the Fazoli's site on the Ethan Allen site.
The existing inlet has adequate capacity for the additional runoff. An existing 24-inch RCP will
convey the runoff from the inlet to the Mait Creek box culvert. An easement will be dedicated
� for the existing storm sewer on the plat.
Basin B covers 0.73 acres of the site and include the proposed building, drive thru lane and all
, parking on the north side of the site. Runoff from Basin B will flow overland towards a Type
R inlet in a sump located in the northeast portion of the site. The proposed inlet will be
connected to the Mail Creek box culvert. If the inlet were to become pluged with debris the
� overflow would drain to South College Avenue.
Sasin C covers 0.05 acres of the site in the landscaped area along South College Avenue.
' Runoff from this area drains directly towards South College Avenue.
�
his unofficial copy was downloaded on Jan-04-2022 from the City of Fort Collins Public Records Website:http://citydocs.fcgov.com
or additional information or an official copy,please contact City of Fort Collins Utilities 700 Wood Street Fort Collins,CO 80524 USA
'
1 FINAL DRAINAGE STUDY
FOR
� FAZOLI'S AT ARBOR PLAZA P.U.D.
�
IV. Erosion Control �
��
Soil erosion from the site will be controlled using standard erosion control facilities. Sediment
� leaving the site is not ex�ected to be a problem since all the sediment will drain into the central
inlet and the exfst�ng inlet. A straw bale inlet filter will protect the central inlet while a gravel
filter will protect the existing inlet. Straw mulching will cover approximately 50% of basin B
� in order to help prevent on-site erosion. A silt fence will be constructed around the perimeter
of the site as to prevent construction activity disturbing the surrounding area. Furthermore,
water trucks will be provided to keep wind erosion in check if called on by the City Inspector.
An erosion control escrow of approximately $3,450.00 was calculated to secure the approved
� erosion control measures.
�
, V. Conclusion
The design presented in this report will provide facilities which adequately and safely convey
developed storm runoff from the site and discharge it in an acceptable manner to Mail Creek.
� • \1'�'��ti1��4,i��lllldl///////
�� �E �
��\\�.•°�� E•�Gtis 9��
� �
' Keith E. Hensel, P.E. _ �
Colorado Registration No. 28345 = � �
� fior and on Behalf of �-b �r,� �� ��
ADAMS-AVERY, LTD. ����,cF,�N. •• ������
. ��//%�ON�C�'����`
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or additional information or an official copy,please contact City of Fort Collins Urilities 700 Wood Street Fort Collins,CO 80524 USA
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or additional information or an official copy,please contact City of Fort Collins Utilities 700 Wood Street Fort Collins,CO 80524 USA
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CO�STRIICTION SEOliE�C£
;OJEC7: �� ��L�`S (jT ��c�� P�rl� STAI�DARQ FORM C
QuE.rC�. �OR 19a5-S�ONE.Y COMPLE�ED BY: A�AmS- ��`�, ��+D. DATE: _O�_��-
. �
idicate by u5e of a bar l�ne or s��nbols when erosio� convrol measures wi11 be ins�alled.
�jar modificatians �o a�_ approved schedu�e may. require submitting a new scnedule for
i�roval by tne City Engineer. - ,
- YEA`R � �' ��` �
� MOi�TH � N � [� ! � � F I 1'� � t� I Y� � 7 � S I f� I ` � n �
�_-__-_----------------------�-------- ----------------------------------------___--___ E
'�RLQT GR�D��G _ ' i . k I .. �
ND E�OSIO�V :CQNiROt � . ` -
Sai 1 Roughi r�g � f
Per�meter �arrier ; � � f
Rd�itional Barriers I ' �
Veaetati ve �te�hods _ E � . � � f
soil Sealar�L - � � - 1
Other
. � � �
�I`IF;LL EROSTG�V COyTRCL ( �
S I r�UCjURnL: : � �
Sedimen� Trap/Sasin � ' j �
InTet Fil Lers . � �-i- . . � '
Straw Barriers � j
Si1t �enc� Barriers '
Sand Bags l � �
Bare Soil Pre�aration � W ' j �
Conta�r Furrows � � j
7erraci ng - �� ' _ -�
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O�her : j � � �
' �
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V�GcTATI1JE: ' � � �
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N�ul ch�ng/S�al ant � ; - j
Temporary Seed Plan�ing� ;f � I.
Sod Installa��cr� � � I
P�ett3 ngs/�^ats/B1 ankets � � I
Other � � �
� _ � V
-------------------------------------------------------------------------------------- �
RiiC;LRES: i�STnLLED BY MAINTAIN�D 8Y
GETA�ION/�4U�CHING CONTRACTOR �
T� SU8�7ITTED APPROV�D BY CIiY OF FORT COLLINS ON
I/Sr-C:198�
his unofficial copy was downloaded on Jan-04-2022 from the Ciry of Fort Collins Public Records Website:http://citydocs.fegov.com
or additional information or an official copy,please contact City of Fort Collins Utilities 700 Wood Street Fort Collins,CO 80524 USA
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his unofficial copy was downloaded on Jan-04-2022 from the Ciry of Fort Collins Public Records Website:http://citydocs.fcgov.com
or additional information or an official copy,please contact City of Fort Collins Urilities 700 Wood Street Fort Collins,CO 80524 USA
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f� - ' � TABI.E 3-1 (42) .
��••� �RECOI'�MENDED •RUI�O�F COEFFICIENTS Atr'D PERCENT IM�ERVIOUS
1� � � . . •
�Atr'D USE 4R • PERCENT .__ � FREQUEhCY
�, SUR�ACE CHARACTERISTICS� II�IPERVIOUS 2 �:� 5 10 10�}
�y�
B�siness• � �
� Commercia] Areas � 95 .37 .87 .88_ .89
,
tr'eighborhood Areas 70. . 60 .65 .70 .80
�� Residential : . _ .
- Single-Fanily * .40 .45 .50 .60
, Erulti-Unit �detached) �0� .45 .SO .60 .70 �
�' ; Ifulti-Unit (attaciied) � 70 .6� .65 .70 .80
1/2 Acre Lot or Larger * . .30 .3�5 .40 .60
�' Apartments i0 .6�5 .�0 .70 .80 - -
�ndustrial :
�, Light Areas 80 .71 .72 . 76 .82
Heavy Acres � 90 .80 .80 .85 .90
!� . Parks , Cemetaries: 7 . 10 � .18 .25 •4�
� Pla rounds: ?3 . 15 � .20 .30 .50
� Sc�oo�s: - 50 .45 � .5Q .60 .70
Railroad Yard Areas 20 .20 � .25 � .35 .45 -
� Undeveloped A�eas :
Historic F1oti�r .Rna�ysis- 2 (See "Lawns")
� , Greenbelts , Agricult�ra�
O��site Flow Analysis 45 .�3 .47 .55 .65
(when land �ase not derined)
I' Streets: - -_
Paved 100 ' .87 . .$8 .90 .93
� Gravel �Packed) �0 .40 .45 • .50 .6Q -
Drive and Walks: _ 96 .87 .87 .88 .89
�' Roofs: - 90� .80 : .85 .30 .90
Lawns , Sandy Soil � p. .00 .O1 .05 .20
�' Lawns , C1aXey Soil 0 .�5 .15, .25 .50
hOTE: �'hese Rational Formu�a caefricients may not be valid for large bas�ns.
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*See Figure 2-1 for percen� impervious.
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� 11-1-90 �
� !}RBAty� DRRIi�IAG� AI�D FL000 COWTROL DISTRIC7 .' ,
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• _ his unofficial copy was downloaded on Jan-04-2022 from the Ciry of Fort Collins Public Records Website:http://citydocs.fcgov.com
or additional information or an official copy,please contact City of Fort Collins Urilities 700 Wood Street Fort Collins,CO 80524 USA
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