HomeMy WebLinkAboutDrainage Reports - 11/15/2004PROPERTY OF
FORT COLUNS UTMfr=s
F inai Approved Repo,a
FINAL DRAINAGE & EROSION CONTROL REPORT
for
EASTGATE P.U.D.
LOTS 4 AND 5
' FINAL DRAINAGE AND EROSION CONTROL REPORT -
FOR
=
EASTGATE P.U.D.
'
LOTS 4 AND 5
' Prepared for:
DAN BERNTH
DOBERSTEIN LEMBURG.COMMERCIAL
'
702 West Drake Road
Building E, Suite B-1102
' Fort Collins, CO 80526
_
Prepared by:
^ "
•e.S 5 L A ,
North
Star Design
700 Automation Drive, Unit I
' Windsor, Colorado 80550.
(970)686-6939 .
' November 12, 2004
Job Number 170-05
1
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F
TABLE OF CONTENTS
TABLEOF CONTENTS........................................................................................................... in
1. GENERAL LOCATION AND DESCRIPTION
1.1 Location..............................................................................................................1
1.2 Description of Property ........................................................................................ I
2. DRAINAGE BASINS AND SUB -BASINS
2.1 Major Basin Description................................................................:..............:......1
2.2 Sub -Basin Description...............................................................,..........................1
3. DRAINAGE DESIGN CRITERIA
3.1
Regulations..........................................................................................................2
3.2
Development Criteria Reference and Constraints..................................................2
3.3
Hydrologic Criteria..............................................................................................2
3.4
Hydraulic Criteria.................................................................................................2
4. DRAINAGE FACILITY DESIGN
4.1
General Concept.................................................................................................. 2
4.2
Specific Flow Routing..........................................................................................3
4.3
Drainage Summary ...............................................................................................3
5. EROSION CONTROL
5.1 General Concept.................................................................................................3
5.2 Specific Details .............................................................................:......................4 .
6. CONCLUSIONS_
6.1 Compliance with Standards.................................................................................4
6.2 Drainage Concept.........................................:......................................................4
7. REFERENCES ....................: ..a ....................... ...................... 4
APPENDICES
A Vicinity Map
B Hydrologic Computations
C Figures and Tables
D Figures and Tables
in
1 �
North Star
1 �` design, inc.
1
1 '
November 12, 2004
1 Basil Hamdan
City of Fort Collins Stormwater
1 700 Wood Street
Fort Collins, CO 80522-0580
1 RE: Final Drainage and Erosion Control Report for East ate P.U.D. Lots 4 and 5
. P g ,
1 Dear Basil, "
1 I am pleased to submit for your review and approval, this Final Drainage & Erosion Control
Report for Eastgate P.U.D., Lots 4 and 5. I certify that this report for the drainage design of
1 Eastgate P.U.D. was prepared in accordance with the criteria in the City of Fort Collins Storm
Drainage Manual.
1 I appreciate your time and consideration in reviewing this submittal. Please call if you have any
miactinne
1
1
1
t
R
txu_rc.
700 Automation Drive, Unit I Windsor, Colorado 80550
970-686-6939 Phone . 970-686-1 188 Fax
1. GENERAL LOCATION AND DES
CRIPTION
1.1. Location
' Eastgate P.U.D., Lots 4 and 5 are located in Fort Collins on the south side of Riverside
Avenue, east of the Pitkin Street intersection. This project is located in the Northwest
=� Quarter of Section 18, Township 7 North, Range 68 West of the Sixth Principal Meridian,
in the City of Fort Collins, Larimer County, Colorado. The site is bounded on the north
by Riverside -Avenue, and by existing commercial lots on the other three sides. See the
' Vicinity Map in Appendix A.
1.2. Description of Property
The_project consists of approximately 0.5 acres of land. The proposed improvements on
_�. this site consist of a two single -story buildings with associated drives, walks, and parking.
Access is obtained on the north from Riverside Avenue. No portion of the proposed
project is within a designated floodplain area. The site is currently undeveloped, with
existing vegetation consisting mainly of native grasses. The existing drainage pattern is
to the north into Riverside Drive at a slope of approximately 2%.
2. DRAINAGE BASINS AND SUB -BASINS
2.1. Major Basin Description
aZ7te proposed development lies within the Spring Creek Drainage Basin. There is
currently an uncertified detention pond to the southwest of the site. No other storm water
detention or water quality facilities exist on -site or in close proximity to the site. A
portion of this site will flow to the detention pond located southwest of this site. Because
of existing improvements on the adjacent lots, not all of the site is able to drain to the
detention area. The original site plan for this site shows these lots draining directly onto
Riverside Avenue without detention, therefore this plan is an improvement over the
original site plan for these lots.
2.2. Sub -basin Description
The existing drainage pattern for the site is to the north into Riverside Avenue. With the
proposed grading plan, approximately half of the runoff will continue to be released into
Riverside Avenue and half of the runoff from the site will be captured in the detention
1
area to the southwest. A small portion of the site (0.03 acres) will release onto the
adjacent lot to the south. Refer to Section 4 of this report for more specific sub -basin
routing details.
3. DRAINAGE DESIGN CRITERIA
3.1. Regulations
This report was prepared to meet or exceed the "City of Fort Collins Storm Drainage
Design Criteria Manual' specifications. Where applicable, the criteria established in the
"Urban Storm Drainage Criteria Manual" (UDFCD), 2001 has been used. In addition, the
criteria set forth in the drainage report by Shear Engineering have been followed.
3.2. Development Criteria Reference and Constraints
' - The runoff from this site has been routed to conform to the requirements of the City
' Stormwater Department. Storm water detention and extended water quality detention are
proposed for a portion of this site.
' 3.3. Hydrologic Criteria
Runoff computations were prepared for the 10-year minor and 100-year major storm
frequencies utilizing the Rational Method. All hydrologic calculationsassociated with
the basins are included in Appendix B of this report.
3.4. Hydraulic Criteria
' All hydraulic calculations within this report have been prepared in accordance with -the
City of Fort Collins Drainage Criteria and are included in Appendix B of this report. The
' only proposed storm conveyance facilities on site are metal sidewalk culverts and
concrete channels. These will be used to runoff from the parking lot and grassed swales
' to Riverside Avenue on the north or to the detention area on the southwest.'
4. DRAINAGE FACILITY DESIGN
' 4.1. General Concept
' Runoff from the majority of the site (Basin 4) will flow to the south via surface flow and
be released into the off site detention pond. Runoff from a portion of the site will be
' 2
routed to the north into the existing Riverside Avenue north of the site. In the 100 year
storm event, the total flow entering Riverside in the developed condition (1.59 cfs) is
slightly higher than the historic runoff currently entering Riverside from the undeveloped
site (1.04 cfs). The increase in runoff (0.55 cfs) to Riverside is very minor and will have a
negligible effect on the depth of flow in Riverside in a 100-year storm event.
Runoff from the remainder of the site (Basin 5) will flow to the south onto the adjacent =
property (Lot 11). Storm water detention and extended water quality detention are being
provided offsite with this design.
4.2. Specific Flow Routing
A summary of the drainage patterns within each basin is provided in the following .
paragraphs.
Basin 1 is located in the northwestern portion of the site, including the northwest half of
the building on Lot 4 and the landscape area to the north. Runoff from this basin will be
conveyed via a grassed Swale and concrete channel to Riverside Avenue. Basin 1 runoff
is 0.15 cfs for the 10-year minor storm and 0.38 cfs for the 100-year major storm.
Basin 2A contains the northwest corner of the parking lot. Runoff from Basin 2A will be
conveyed via concrete channel to Riverside Avenue. Runoff from this basin is 0.13 cfs
for the 10-year storm and 0.35 cfs for the 100-year storm.
Basin 2B contains the northwest comer of the parking lot. Runoff from Basin 2A will be
conveyed via the main entry to Riverside Avenue. Runoff from this basin is 0.18 cfs for
the 10-year storm and 0.48 cfs for the 100-year storm.
Basin 3 is located in the southeastern portion of the site, including the southeast half of
the building on Lot 5 and the landscape area to the south. Runoff from this basin will be
conveyed via a grassed swale and concrete channel to Riverside Avenue. Basin 3 runoff
is 0.15 cfs for the 10-year minor storm and 0.38 cfs for the 100-year major storm.
Basin 4 is located in the south central portion of the site, including portions of both
buildings, landscape areas and sidewalks. 'Runoff from this basin will be conveyed via
gutter flow_ to the detention basin southwest of Lot 4. Basin 4 runoff is 0.89 cfs for the
10-year minor storm and 2.27 cfs for the 100-year major storm.
3
Basin 5 is located in the southern portion of the site, including landscape area and
sidewalk south of the building on Lot 5. Runoff from this basin will be conveyed via
overland flow to the existing parking lot south of Lot 5. This parking lot drains east into
E. Pitkin Street. An inlet exists at the west corner of the intersection of E. Pitkin and
Riverside and the runoff will enter this inlet. Basin 5 runoff is 0.07 cfs for the 10-year
minor storm and 0.17 cfs for the 100-year major storm.
4.3 Drainage Summary
The majority of the runoff from the site will be directed to the off site detention area with
a portion of the runoff being released into Riverside Avenue. The remainder of the on -
site runoff will flow to the existing parking lot on the south. Drainage facilities located
outside of the right-of-way will be maintained by the owners of the property. Drainage
facilities located within the right-of-way will be maintained by the City of Fort Collins.
-EROSION CONTROL
5.1. General Concept
This site lies within the Moderate Rainfall and Wind Erodibility Zone per the City of Fort
Collins and into adjacent properties. Potential also exists for tracking of mud onto
existing streets which could then wash into existing storm systems. Erosion and
sedimentation will be controlled on -site by the use of silt fence, straw bales, and a
stabilized construction entrance. See the Drainage & Erosion Control Plan in the back
pocket for details. These measures are" 'designed to limit the overall sediment yield
increase due to construction. Silt fences or straw bale dikes will also be utilized in limited
areas adjacent to any stripping stockpiles that are created during grading. They will also
be used to slow runoff around the perimeter of the site as shown on the plan.
5.2. Specific Details
To limit the amount of silt leaving the site several erosion control measures shall be
implemented during construction. Straw bales will be used in the grassed swales and
where appropriate and the site boundary shall have silt fence installed. A vehicle tracking
pad shall be installed at the connection to Riverside Avenue to control the mud being
tracked onto the existing pavement. During overlot grading, disturbed areas are to be
kept in a roughened condition and watered to reduce wind erosion.
4
6. CONCLUSIONS
6.1. Compliance with Standards
All computations that have been completed within this report are in compliance with the
City of Fort Collins Erosion Control Reference Manual for Construction Sites and the
Storm Drainage Design Criteria Manual.
6.2. Drainage Concept
Conveyance elements have been designed to convey required flows to the existing curb
and gutter of Riverside Avenue and the existing detention pond and to minimize future
maintenance. If, at the time of construction, groundwater is encountered, a Colorado
Department of Health Construction Dewatering Permit will be required.
7. REFERENCES
1
2.
City of Fort Collins, "Storm Drainage Criteria Manual", (SDCM), dated March
1999.
Urban Drainage and Flood Control District, "Urban Storm Drainage Criteria
Manual", Volumes 1 and 2, dated June 2001, and Volume 3 dated September
2001.
No Text
SHUT 1 OF 1
DATE: 11/10/04
SCALE. ''-2Q00" %EASTGATE P.U.D. low design, Star
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desi
DESIGNED BY: sB LOTS 4 AND b 700 Automation Drive, unit I
VICINITY MAP Windsor, Colorado 80550
Phone: 970-6866939
JOB NO.: 170—OS Fax: 970686-1188
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Worksheet for Rectangular Channel '
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Project Description
Worksheet Metal Sidewalk Culvert - Be
t
Flow Element Rectangular Channel
Method Manning's Formula
Solve For Channel Depth
Input Data
Mannings Coeffic ).013 _
Slope 1.00 % _
-
Bottom Width 1.00 ft
Discharge 0.35 cis
Results
Depth 0.14 ft
Flow Area 0.1 ft'
Wetted Perimi 1.27 ft
Top Width 1.00 ft
Critical Depth 0.16 ft
Critical Slope 0.66 °k
Velocity 2.57 ft/s -
Velocity Head 0.10 ft
Specific Ener£ 0.24 ft
Froude Numb 1.23
Flow Type supercritical
Project Engineer. Patricia Kroetch
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Worksheet for Rectangular CFannel
Project Description
Worksheet
Metal Sidewalk Culvert -POND t '
Flow Element
Rectangular Channel
Method
Manning's Formula
_
Solve For
Channel Depth
Mannings Coeffic ).013
Slope
3.00 %
Bottom Width
3.00 It
Discharge
15.04 cis
Results
Depth
0.49 It
Flow Area
1.5 ft' —
Wetted Perim)
3.98 ft
Top Width
3.00 ft
Critical Depth
0.92 It
Critical Slope
0.48 % _
Velocity
10.20 fits
Velocity Head
1.62 ft
Specific Eneri '
2.11 It
Froude Numb.
2.57
Flow Type supercritical
Project Engineer. Patricia Kroetch
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Worksheet for
Tri , 0 a `Ch)annel ,
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Project Description
.,
Worksheet
Swale (Basin 1)
aa;•.='.,
Flow Element
Triangular Char
Method
Manning's Fom
_ l
Solve For
Channel Depth
Input Data
Mannings Coeffic ).030
_
Slope
2.00 %
_
Left Side Slope,
4.00 H : V
Right Side Slope
8.00 H : V
Discharge
15.42 cfs
Results
Depth
0.82 ft
Flow Area
4.0 ft'
Wetted Perimr
9.99 ft
Top Width
9.84 ft
Critical Depth
0.84 ft
Critical Slope
1.79 %
-
Velocity
3.83 ft/s
Velocity Head
0.23 ft
Specific Enerf
1.05 ft
Froude Numb'
1.05
Flow Type wpercritical
Project Engineer. Patricia Kroetch
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10/15/04 10:03:35 AM 0 Haestad Methods, Inc.,• ,37,8rookside Road Waterbury, CT 06708 USA (203) 755-1666 Page 1 of 1
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Project Description
Worksheet
Swale (Basin 3)
'
Flow Element
Triangular Char
Method
Manning's Fom
' Solve For Channel Depth -
Input Data
ManningsCoeffic).030
'
Slope
2.00 %
Left Side Slope
4.00 H : V
Right Side Slope
4.00 H : V
' Discharge
0.38 cfs
Results
' Depth
0.24 ft
Flow Area
0.2 ft
Wetted Periml
1.97 It
Top Width
1.91 ft
z Critical Depth
0.22 ft
Critical Slope
2.83 %
Velocity,
1.66 fits
Velocity Head
0.04 ft
Specific Enerf
0.28 ft
Froude Numb
0.85
Flow Type 3ubcritical
f J' Ei
kill'.
inguLLlar Channel
> 4
u.
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..rc
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Project Engineer. Patricia Kroetch
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10/15/04 10:03:51 AM 0 Haestad Methods, Inca 37 Brookside Road Waterbury, CT 06708 USA (203) 755-1666 Page 1 of 1
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APPENDIX C
EROSION CONTROL ESCROW
Cost Est
EROSION CONTROL COST ESTIMATE
Project: EASTGATE LOTS 4 & 5
Prepared by: PPK
ITEM
QUANTITY
UNIT
COST/UNIT
TOTAL COST
Silt Fence
270
LF
$3
$810
Straw Bale Barrier
4
EA
$1S0
$600
Gravel Inlet Filter
0
EA
$1,50
$0
Construction Entrance
1
EA
$550
$550
Subtotal
Contingency (50%)
Total
$1,960
$980
$2,946
CITY RESEEDING COST
Reseed/Mulch
0.5
ACRE
$650
$325
Subtotal
Contingency (50%)
Total
$325
$163
$488
EROSION CONTROL ESCROW AMOUNT $2,940
0
Page 1
c.
1
APPENDIX D
FIGURE AND TABLES
1
� r
1
1
1
1
1
.
1
1 D
1
;
MANUAL (V. 1)
TABLE RO-3
Recommended Percentage Imperviousness Values
Land Use or
Surface CharacterMcs
Percentage
Imperviousness
Business:
Commercial areas
95
Neighborhood areas
85
Residential:
Single-family
Multi -unit (detached)
60
Multi -unit (attached)
75
Half -acre lot or larger
Apartments
80
Industrial: -
Li ht areas
80
Heavy areas
90
Parks, cemeteries
5
Playgrounds
10
Schools
50
Railroad rd areas
15
Undeveloped Areas:
Historic flow analysis
2 -
Greenbelts, agricultural
2
Off -site flow analysis
(when land use not defined)
45
Streets:
Paved
100
Gravel (packed)
40
Drive and walks
90.
Roofs
90.
Lawns, sandy soil
0
Lawns, clayey soil
0
See Figures RO-3 through RO-5 for percentage Imperviousness,
Basedin part On the data collected by the District since 1969. an empirical relafforishipi between . C and
the percentage imperviousness for various storm return Weds was developed. Thus, values for C can
be dOlOrMkW using the following equations (Urbonas, Guo and Tucker 1990).
Cj = KA + (1.3 1P I.. 44i2 + 1. 135i — 0.12) for CA 0, otherwise CA = 0 (RO-6)
:4
i2 + 0.774i + 0.04)
CCD KCD + (0.858P — 0.786
Ca (CA + CCD)12
In watch:
kiperviousness/I 00 expressed as a declmW (see Table ROB)
0111121011
Ultin Dmkwo wd Rood Contrai oisb
I
Ft"
City of Fort Collins
Rainfall Intensity-0uration-Frequency Table
fQr usingthe Rational Method
(5 Minutes - 30 minutes)
Figure 3-ta
Duration
(minutes) ;.
2-year
Intensity
in/hr
10-year
Intensity
in/hr
100-year
Intensity_
in/hr
5.00
2.85 -
4.87
9.95 -
6.00
2.67
4.56
9.31
7.00
2.52
4.31
8.80
8.00
2.40
- ..4.10 = ='
=' "- 8.38
9.00
2.30 -
3.93
.8.03 • :7
10.00
2.21
3.78
7.72
11.00
2.13
3.63
7.42
12.00
2.05
3.50
7.16 '
13.00
1.98
3.39
6.92 .
14.00
1.92
3.29
6.71
15.00
1.87
3.19
6.52
16.00
1.81
3.08
6.30
17.00
1.75
2.99
6.10
18.00
1.70
2.90
5.92
19.00
1.65
2.82
5J5
20.00
1.61
2.74 _
5.60
21.00
1.56
2.67
5.46
22.00
1.53
2.61
5.32...
23.00=-
4.49
2.55
5.20'
. 24.007
1.46
2.49
5:09
25.00
1.43 ..
2.44
4.98
26.00
1.40
2.39
4.87
27.00
1.37
2.34
4.78
28.00
1.34
2.29
4.69
29.00
1.32
2.25
4.60
= 30.00
1.30
2.21
4.52
:r'
/Jj
rRAINAOF SIAMMARY TABLE
OEeGY
PANT
ME/.
OPEC
ACRES
c
T< (10)
YIN
To (too)
o (10)
crr
a (i00)
c(s
1
aUJUm
D.0
s.D
o.ts
F]e
p
pn
0.06
BUR
oas
56
s0
05
035
3
39
Os
ss
s.01
11
0sa
]
J
003
O.Js
s.0
s.0
0.5
038
a
a
033
Odd
5.0
50
0.B9
3P
5
5
003
1 0.53
1 5.0
I I I
O.OI
09
ter,
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wed
yWMEDIATI
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me
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SCALE. IS
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ly
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4
STANDARD EROSION AND SCALMENT CON 0L CONSTRUCTION PLAN NOTES
nd b.. 2003
". m'. d g".t� of how EOOW1.1 Plains
, LHAMpeng HUMAN,
3 All logo rod pyromfor III no consul MOR Shull be real Ed mAmL to EYE land 1.1reat off
m�u�ce am miciond a the dider Irempt pagandia. Carol plane And down, anywag rep.,
4 At of fee. Sharing I ... indoor I'S menswer .1.11 be rsK�.,bl. for r.."tQ End coni Dri erosion ALLEN
A�ng the prmwly of .it, debt so am to more Phil SAN �l,.nt Th. Deg.flopow AN ... .... .. A AS of .... . far
Atnew rig and I ad al pown at fee to. At own
." m
Toshiba sabotake, ME offer "��ont erosion paying
far
More than NET u; a%HARRIS NP w.. o. (sires Carl e..le),"
Al unless C /
the, Intended Came on
0 Rome. AT '.be Art I San too. a. .11 the forhoughl d4k.C" M.. gook
Ed wwi offer the 9 to My' beef offiforty Ityll Zed a. detwm now by The poore, call
"... Leon ." "", MITI 0 A
I A I re a ad sod meet, on, a I mc, he,, o med parody mi III be remo� end d Anne 0 r . nerrom I'd
nal I, In As cut n word thAr Lomas. , i ant Reform of to. no led table
so acep A onto
aoK.Ammanid,.". o, �alInne,nten ponds C;,Ln.,d.o. need To ,,..oIU;°Ab"�.od
3 C I I had achy and Croarday 0 E furp, Perm t Sol" COSTS) requisomearmals make I MIAMI -. A Searle A Kow L 0
a pharge a or I pi t be can am rand water from awl On A Him PE, age mucke hot HA net I I so 0 d A boom
an land motor as concrete L of *Is An them End a I and gas produc s I for one bar Pay waste Top lemigred 1 .1 A
MwAr1a... Ath act and at Pop no 0 mal term ary MAP III
14 A der area Shall be Pi on Ste far Lome a the IT ashout TOP area final Me mommuntod ad S, 1.
away from
l bond cal ji simple an .1
anstrall M Oct It ad the poncom „a,,Into, ol relor .1 old 'aimed It nobler at , <,"c„ .,,...ono" to.area,.,..
15 To of rE Sol Rome ral SCENE IT T no
0 he Sol
"..,,,... <. end .mined d„"e Proton canotal",w.,P.LAST
Local To Lend Cry)
May
t an
.d� �.w.,.,L ".N,,,. . in a,.,,,.,a d.ae".y.ason Spentral de direct"." le. CIe/CwmE ,"...Fein.. The o.."".
�N
ONES
U
`F
Q WW
s�
�c
s] antinco
mm
To
�34u
y�9
L
z�
some
Al
On
O CC
�o z W
a 0
66
� �o
1 0
�HOf
QOal
W Lin
0
HIC
City or FEET Collins. cmowbol
OTILITY PUN APPROVAL
APPROVED:
mot—
Able
❑
SHEET
CHECKED Dec
�—
CALL it NDnFlUTIW
. 1. 01N1.
TER OF DLDRADO
CENTER
wsc«ED ar
5
1.800.922.1987
�"It,tA
Cpy z-e0YSE5x oars iN W
CHECKED BY:
THE PARKING OF tl1"0
PARHEMI
Pie • •gala
on
onunEs.
5 OF
6
CHECKED en.
L e ^
Al NO. 170-05
CHECKED Br..