HomeMy WebLinkAboutDrainage Reports - 04/16/2004'Ine1.Aptt
ate 04
FINAL DRAINAGE REPO T
FOR
LOT 3, MULBERRY/LEMAY CROSSING
FILING NO. 1.
SITUATE IN THE
CACHE LA POUDRE BASIN & FEMA 100-YEAR FLOOD PLAIN
PREPARED FOR EILEEN TURGEON AND DIANA MAY
FEBRUARY 18, 2004
PREPARED BY
STEWART & ASSOCIATES, INC.
P.O. BOX 429
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80522
TEL: 970.482.9331
FAX: 970.482.9382
NIULHRY LMY XING IM Amg ❑rtAM
TABLE OF CONTENTS
1 VICINITY REPORT
2 & 3 TEXT OF REPORT
4 & 5 RUNOFF CALCULATION
6 DETENTION POND MASS DIAGRAM
7-12 EXTENDED DETENTION
13-16 EROSION CONTROL CALCULATIONS
17 FIRM PANEL
MULBRY LKIY RING LT3 ding rpl d.c
(1)
VICINITY MAP
SCALE: 1 "=2000' z
E. LINCOLN AVE.
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E. ELIZABETH ST.
(2
STEWART&ASSOCIATES
Consulting Engineers and Surveyors
February 19, 2004
Mr. Basil Harridan
Stormwater Utilities
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
Dear Basil.
The following is the Final Drainage Report for Lot 3, Mulberry / Lemay Crossing, Filing No. I which is
situate in the Southwest 1/4 of Section 7, Township 7 North, Range 68 West of the 6th P.M., City of Fort
Collins, County of Larimer, State of Colorado. The site is in the Cache la Poudre River Basin. The area
of Lot 3 is 10,183 square feet. The lot is zoned C-Commercial . The proposed use is for a drive -up
coffee house named "Beantrees."
This site is all in the FEMA 100-year flood plain per Firm Panel No. 080102 0004C dated and revised
March 18. 1996. A copy is included in the pocket of this report with our site located on it. The base
flood elevation of this site is 4,932 shown on Sheet 3 of the Utility Plans included in the pocket herein.
Therefore. the building and HVAC regulatory flood protection elevation is 4,934.
The building is designed for a drive-thru coffee house with some sit-down area. It will be slab -on -grade
construction and both the finished floor elevation and the HVAC slab will be constricted at elevation
4,934.10 feet. A FEMA Elevation Certificate will be completed and approved before the Certificate of
Occupancy is issued by the City of Fort Collins, Colorado. A variance to the Poudre River Dryland
Access Requirement was approved on January 22. 2004. All floatable materials (bike rack, trash bin,
tables, chairs, etc.) must be anchored. This project is in compliance with Chapter 10 of the City Code.
Also, a flood -plain use permit for this site has been completed.
The site is bounded on the North by Magnolia Street, on the West by 12th Street, on the South by
Supermarket Liquors and on the East by Lot 4, Rohrbacker P.U.D.
The site slopes from North to South at an approximate slope of 0.7%,. The ground cover is dry -land grass
and weeds.
The historic site is one basin. The two-vear runoff rate is 0.07 c.f.s. and the ten-year ninotf rate is 0.11
c.f.s. and the 100-vear historic rate is 0.30 c.f.s.
The developed site is also one basin. The two-year runoff rate is 0.14 c.f.s. and the ten-year runoff rate is
0.23 c.f.s. The hundred-vear runoff rate is 0.64 c.f.s.
A detention pond is being constructed 'between the coffee house and the East line of Lot 3. The required
volume is 959'cubic feet. The required water quality volume is 235 cubic feet.
The discharge from the pond will be to 12th Street at the two-year historic rate of 0.07 c.f.s
James H. Stewart and Associates, Inc.
103 S. Meldrum Street • P.O. Box 429 • Ft. Collins, CO 80522
MULRRY LEI Y XING 1. ri dmg npu d"I 970/482-9331 • Fax 970/482-9382
EROSION CONTROL:
The wind credibility is moderate and the rainfall erodibility is high. A silt fence will be constructed along
the South property line and along the back of the East walk for 12th Street. The water quality structure
and the detention pond will be constructed at the beginning of the project. The contractor will remove
mud from 12th Street daily.
The stormwater runoff calculation and the erosion control calculations and the water quality calculations
are enclosed as a part of this drainage report.
This drainage report and the design of the drainage system are in compliance with the City of Fort Collins
Storm Drainage specifications and criteria.
If you have any questions regarding this report please call.
Sincerely,
Richard A. Rutherfor , P.E. & L.S.
RAR/meh
MULBRY LMY XING LT3 dmg rpt.doc
STEWART&ASSOCIATES 103 S. MELDRUM, FORT COLLINS, CO 80521
PH 482
Consultin3 En"ineersanc Surveyors -9331 FAX 482-9382
BY f� Date: r so
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STEWART&ASSOCIATES 103 S. MELDRUM, FORT COLLINS, CO 80521
Consulting Engineers and Surveyors PH. 482-9331 FAX 482-9382
BY: L.A iC — Date: X)pv. I+ 7on3CIient:F„!Sheet No. <Sof_
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Consulting Engineers and Surveyors
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By: ---,/5GA Date: Client:
Project:
Subject:
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103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
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STEWART&ASSOCIATES 102 DiFAXR, FORT gOLLINS, CO 80521
Consulting Engineers and Surveyors PH. 8933/�
By: JVC - r) Date: _�/-Oy Client: /y/'G/C� /J %o/ y Sheet No. - of
Project: 40 7
Subject:
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DRAINAGE CRITERIA MANUAL (V. 3) STORMWATER QUALITY MANAGEMENT
a.5(.00
Note: Watershed inches of runoff shall apply to the
entire watershed tributary to the BMP Facility.
FIGURE 5-1. WATER QUALITY CAPTURE VOLUME (WQCV)
9-1-1992
UDFCD
DETENTION POND HIGH WATER LINE
I4*:�
CONTOUR
AREA
AVERAGE AREA
INTERVAL
1 194.0 ='REQ.yOLU
L-----
CUMMULATIVE HIGH WATER
s •ft•)
sq.ft.
VOLUME cu.ft.
VOLUME cu.ft.
LINE ft.)
31.0
0.0
- --
517:5
103.4
103.4
31.3
1,035.0
4132.0
F.
1,633.5
i,f16.9
':1;220.3
2,232.0
.
32.0
2,625.6'
1,307i8
2.528.1
--
32.51
3,019.0
1. FOR THE FIRST CONTOUR VOLUME A CONIC SHAPE WAS ASS
- i- k. nc.,.,Dvve) tulrrtHENUE IN COUNTOUR ELEV.)
2. FOR THE REMAIMDER OF THE VOLUMES BETWEEN CONTOURS (SECTION 9.2)
VOL. = DEPTH/3 (A +(AB) ^ .5 + B) FOR: Uniform Sides sec.(9.2)
3. HWL=(VOL.REQ.-VOL.LOW CUML)*3/(AREA LOW+AREA HIGH+(low area*high area) ^ .5)
31.99 =. HWL POND.
ORIFICE SIZING
nPIr.IMA1 nr=¢Ir_nI nATA
0.07 = Allowable Des. Release Rate cfs
31.00 = Flowline Orifice Elevation ft
0.65 = Orifice Coefficient (Cd)
0.99 = Avaliable Driving Head(ft
VERT. CIRCULAR PLATE
2.01 _= Outlet Area s inches
0.80 Circular radius inches
0.92 = Actual Hvdraulic'Driving Head
VERT. SQUARE PLATE
2.00 =.Outlet Areas inches .>:
1.41 =Side for S O enin9(iriches
0.93 Actual Hvdraulicbrivin Haad(ft)_
NOTE: 1. VERT. PLATES WILL BE PLACED
AT PIPE FLOWLINE
0'
N
_ DRAINAGE CRITERIA h1ANUai ry, 3)
10,
6.
4.
2.1
1.0
m 0.6C
t
• 0.
s.
/ 0.02
0'
STRUCTURAL E%iPs
SOLUTION: Required Area per
i
MIA
'"" c.0 4.0 b.0
D, (/ Required Area per Row (n.2 )
SOUMO: Douglas County Storm Drainage and Technical Criteria. 1986.
FIGURE 5-3. WATER QUALITY OUTLET SIZING: DRY EXTENDED DETENTION
BASIN WITH A 40-HOUR DRAIN TIME OF THE CAPTURE VOLUME
9-1-1992
UDFCD
DRA';NAGE CRITERIA MAINUAL (V. 3)
0Z;
.STRUCTURAL B,kipg
Threaded Cap
Water Quality Capture Volume
Level (including 20% additional
volume for sediment storage)
Gravel (1-1/2'to
3' Rock) Around
?erforated Riser
Filter Fabric
Water Quality
Riser Pipe (See Detail)
Notes: 1. The outlet pipe shall be sized to control
overflow into the concrete riser.
2. Alternate designs include a
Hydrobrake outlet (or orifice
designs) as long as the hydraulic
Performance matches this
configuration.
Notes: 1. Minimum number of holes = 8
2. Minimum hole diameter - 1/8' dia.
Access P
(Min. 3 ft)
OUTLET WORKS
NOT TO SCALE
1-1/2" diameter Air
Vent in Threaded C
Water Quality
Outlet Holes
Ductile Iron or
Steel Pipe
rER QUALITY
HISER PIPE
NO E
am
Removable & Lockable
Overflow Grate for
Larger Storms
Outlet Pipe —►
Size Base to Prevent
Hydrostatic Uplift
Maximum Number of Perforated Columns
Riser
Hole Diameter, in.
Diameter
(in.)
1/4'
1/2'
3/4'
1'
4
8
8
6
12
12
9
8
16
16
12
g
10
20
20
14
10
12
24
24
18
12
Hole Diameter
Area of Hole
(in.)
(in.2 )
1/80.013
1 /4 .
0.049
/2
0.110
1
18
0.196 '
//
3/44
3
0.307
7/
0.442
1
1
0.601
0.785
FIGURE 5-2. WATER QUALITY OUTLET FOR A DRY
9_1_1992 EXTENDED DETENTION BASIN
UDFCD
4B • 63
L1J/
CONSTRUCTION SEQUENCE
PROJECT: Lor
3. Mvc f3Eeav/Len,a�y
CPA
FFiGiN6 (la
STANDARD FORM C
-Iub,
SEQUENCE. FOR
20—4-
ONLY
COMPLETED
BY: R. A, P.
DATE: o¢
Indicate by use of a bar line or symbols when erosion control measures will be installed.
Major modifications to an approved schedule may require submitting a new schedule for
approval by the City Engineer.
2 YEAR
MONTH I T
----------------------------i----�---
OVERLOT GRADING
WIND EROSION CONTROL
Soil Roughing
Perimeter Barrier
Additional Barriers
Veoetative Methods j
Soil Sealant
Other I
RAINFALL EROSION CONTROL
STRUCTURAL:
Sediment Trap/Basin
Inlet Filters
Straw Barriers
Silt Fence Barriers
Sand Bags
Bare Soil Preparation
Contour Furrows
Terracing
Asphalt/Concrete Paving)
Other I
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting)
Sod Installation
Nettings/Mats/Blankets
Other I
STRUCTURES: INSTALLED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED
HOI/SF-C:1989
IN
MAINTAINED BY
-D
---w---------+---------
APPROVED BY CITY OF FORT COLLINS ON
RAINFALL PERFORMANCE STANDARD EVALUATION
PROJECT: I-o-r 3, Mvi.BE�eer%Ls,Kgy Cr2asri�-,F4-"vc4',.' STANDARD FORM A
COMPLETED BY: e 41P. DATE:
----------------------------.-- -----------------------------
DEVELOPEDIERODIBILITYI Asb I Lsb I Ssb Lb
SUBBASIN I ZONE I (ac) I (ft) I M .I(feet) (b) i (S)
--------- I-----------I-------I-------I----- -------I-------I ro,A�ags�Nl 81614 I 0 Z3 Ac,l z4D I o.4c/o I zoo I o.� -------
17Z,Z
--------------------------------------------------------------------
Cis)
EFFECTIVENESS CALCULATIONS
----------------------------------------------------------------------�
�PRO,JECT:CoT 3,Muc.BecRy/oc-^A7, G,coar,uc,FALw6 V#-t STANDARD FORM B
COMPLETED BY: Q, A, ,e, DATE: Fig IS�Zooq�
Erosion Control
C-Factor
P-Factor
Method
Value
Value Comment
----------------------------------------------------------
BA Q GROVAZ>
O, zZ
SEaIMENTTieAP
/, p
D.Sa
SILT FENGE
1.0o ,
6.86
CO✓1CVet(t.'FOUNDAr#ON
0.61
I. 00 Q. O I A[.
MAJOR
BASIN
To :'A L
B.v s1 u
PS
SUB
BASIN
AREA
(Ac)
0.Z3Ac
---------------------------------------------
CALCULATIONS
-------------------
0.01xo,ol� .
a.z3
0.23
W rD . P _ 0,50)( o- go = 0. 4,o
E P P • (0- 4-6 x 0.4-0) X /00 = R6, 6
C>k
---------------------------------------------------------------
)I/SF-6:1989
STEWART$,ASSOCIATES
Consulting Engineers and Surveyors
February 19, 2004
Mr. Basil Harridan
Stormwater Utilities
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
Dear Basil,
The following is the cost estimate for the erosion control measures for Lot 3, Mulberry / Lemay
Crossing, Filing No. 1.
Silt Fence, 240 L.F. @ $3 per L.F. $ 720.00
2. Extended Detention Pond $ 1,200.00
3. Reseeding 0.2337 acres @ $650 per acre $ 152.00
Escrow for site = 1920 x 1.5 = $ 2,880.00
If you have any questions regarding this estimate, please call.
Sincerely,
Gam a.
Richard A. Rutherford, P.E. & L.S.
RAR/meh
"l\lliyy\
r"' ��D'� JJs�t
5028 � H
James H. Stewart and Associates, Inc.
103 S. Meldrum Street • P.O. Box 429 • Ft. Collins, CO 80522
MI II.HRY LAI Y XING 1.T3 Amg q,1 A,ic 970/482-9331 • Fax 970/482-9382
BUCKINGHAM STREET
LOGAN
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LINCOLN
1 /
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«) PROFILE BASELINE
EAST MAGNOLIA
STREET
NE AE
-- -- FIRM PANEL OSOl02-
0004 C, MArrcH �8, i996
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