HomeMy WebLinkAboutDrainage Reports - 06/25/2003' Find d Repo, l
' FTR®TY OF gate ��geo3
PORT
FINAL DRAINAGE REPORT
FOR
' ED CARROLL MOTORS LOT EXPANSION P.D.P.
FOOTHILLS BASIN
PREPARED FOR
ED CARROLL MOTORS
NOVEMBER 29, 2002
PREPARED BY
STEWART & ASSOCIATES, INC.
103 S. MELDRUM STREET
P.O. BOX 429
FORT COLLINS, CO 80522
PHONE: 970-482-9331
FAX: 970-482-9382
t
tm CARROL MLdm
' TABLE OF CONTENTS
1 Vicinity Map
' 2-3 Text of Report
4-7 Stormwater Runoff Calculations
8 Drainage Table
9-10 Detention Mass Diagram & Pond Volume Table
' 11 Orifice Sizing Calculations
12-15 Erosion Control Calculations
' 16-18 Extended Detention Calculation
Pocket Grading, Drainage & Erosion Control Plan
' m CARROL 1p.dm
VICINITY MAP
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STEWART$,LSSOCIATES
' November 29, 2002 Consulting Engineers and Surveyors
' Mr. Basil Harridan
Storm Water Utility
' City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
Dear Basil,
The following is the Final Drainage. Report for Ed Carroll Motors Lot Expansion P.D.P.,
which is situate in the Northeast 1/4 of Section 26, Township 7 North, Range 69 West of the 6th
P.M., City of Fort Collins, County of Larimer, State of Colorado. The site was a part of
' McClelland Office Park P.U.D. and is now being replatted.
The site is in the Foothills Basin and contains 1.48 acres. It is zoned C-Commercial and it
' will be developed as an automobile storage area and display area.
The site is bounded on the South by an existing Ed Carroll Motor Company storage area
' and on the West by McClelland Drive and on the North by an existing office building in the
McClelland Office Park P.U.D. It is bounded on the East by a commercial building in Palmer
Plaza.
' The site slopes from West to East at an approximate slope of 2.5%. The existing ground
' cover is grass and weeds.
The McClelland Office Park has an existing storm drainage system that was partially
' completed for the existing office building to the North of the Ed Carroll Motor Company site.
This site will discharge into the existing storm drain manhole near the Northeast corner of this site
at a two-year historic rate.
' The historic site is 1.48 acres and is divided into two sub -basins. Historic Sub -Basin I is
the East half of McClelland Drive and contains 0.11 acres. The Developed Sub -Basin I is the
' same area. The two year runoff rate is 0.30 c.f.s. and the 100 year runoff rate is 1.09 c.f.s. The
runoff in Sub -Basin I flows North in the East gutter of McClelland Drive and is not detained.
' Historic Sub -Basin II contains 1.37 acres and is the undeveloped site. The two-year
historic rate of runoff is 0.45 c.f.s. and the 100-year runoff rate is 2.07 c.f.s. The runoff from the
historic Sub -Basin 11 flows from West to East and sheet flows onto the National Subdivision.
Developed Sub -Basin II contains 1.37 acres also. The site will be paved for automobile
storage and there are a number of islands for landscaping. The runoff coefficient for the
developed site is 0.80. The 2-year runoff rate is 2.93 c.f.s. and the 100 year rate is 13.63 c.f.s.
The runoff will be detained on site in part of the parking lot and in a detention pond in an island
along the East property line. The detention volume and extended detention volume required is
James H. Stewart and Associates, Inc.
m cARRoL qx.d 103 S. Meldrum Street • P.O. Box 429 • Ft. Collins, CO 80522
970/482-9331 • Fax 970/482-9382
3
16,892 cubic feet for the difference between the 2 year historic volume and the 100 year
developed volume. The amount of detention provided is 16,910 cubic feet. There will be
' extended detention in the pond adjacent to the East property line. The detention pond will
discharge at 0.45 c.f.s. in a 15 inch concrete storm drain to an existing storm manhole in the
driveway of the existing office building in the McClelland Office Park P.U.D.
EROSION CONTROL
' The wind and rainfall erodibility is moderate. A silt fence will be constructed along the
North and East boundary lines of the site before construction begins. The pond at the East
' property line will be graded and the discharge pipe will be constructed at the beginning of the
project. A sediment trap will be placed at the outlet of the pond until the water quahty box is
completed. The contractor will remove any mud off of McClelland Drive daily.
' The stormwater runoff calculations 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,
1
' Richard A. Rutherford, P.E. & L.S.
RAR/meh
' m CARROL rpLdm
STEWART&,SSOCIATES 103 PH. S. 938 RF , FORT COLLINS, GO 80521
Consulting Engineers and Surveyors
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CONSTRUCTION SEQUENCE
PRO JECT:EDCAMee 11. Mo-rap- .Les E:xQANtiov 'P. P. P.
STANDARD FORM C
5EQUENCE. FOR ZooZ ONLY COMPLETED BY: DATE:
indicate by use oI 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.
Z oo ZY EAR I
------------MONTH I T I F I/" I A I M 13- I T I 15. 1 0 1 A) � D
OVERLOT GRADING
WIND EROSION CONTROL
Soil Roughing
Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil Sealant
Other
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
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Ins`allatinn
Nettings/Mats/Blankets
Other
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STRUCTURES: INSTALLED BY MAINTAINED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED
' HOI/SF-C:1989
APPROVED BY CITY OF FORT COLLINS ON
' JANU RY 1991 8-20 DESIGN CRITERIA
(13)
RAINFALL PERFORMANCE STANDARD EVALUATION
---------------------------------------------------------------------
PROJECT: ED GASROLC. Moroe-f-LET F p,4 ,,yp.ARSTANDARD FORM A
COMPLETED BY: 2 A P— DATE: PCs, �i Zo�z
------------------------------------------------------------- -------
DEVELOPEDIERODIBILITY1 Asb I Lsb I Ssb I Lb I Sb I PS
SUBBASIN I ZONE I (ac) I (ft) I (A) .I(feet) I (Q) I (a)
---------I------------------I----- I I i
Sv8-bar MOT�E2A7c It3-7A -Z6,0 I 2.S/,I 2(.J I Z.S 186.7
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DI/SF-A:1939
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EFFECTIVENESS CALCULATIONS
PROJECT: E P C. A le ROLI, or*R f.`• L6=L.E.VrA tVI&V p p p STANDARD FO. w B
COMPLETED BY: 1QAle DATE: FEg I1,Zones
Erosion Control C-Factor P-Factor
Method Value Value Comment
'B A 7e L= SOIL- /. 0 0 / . 0 0 0, (0 / / Ac .
Ec-vlmaNTT.2AP 1100 .0,50
ESTABUSKED(;ZArr 0.09 DD AW '&4c-
S 1L7 FEnJCE /,do a.310
IMP• S �P-r-'qc
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MAJOR
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BASIN
($)
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CALCULATIONS
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STEWARr&AsSOCIATE$
Consulting Engineers and Surveyors
' December 2, 2002
' 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 Ed Carroll Motors
Lot Expansion P.D.P.
' 1. Silt Fence, 485 L.F. @ $3 per L.F. $ 1,455.00
2. Extended Detention Pond $ 500.00
' 3. Gravel Base, 2660 S.Y. @ $2 per S.Y. $ 5,320.00
Total Estimate of items 1-3 $ 7,275.00
' 4. Reseeding 1.37 acres @ $650 per acre $ 891.00
Escrow For Site = $7,275 X 1.5 $ 10,913.00
' If you have any questions regarding this estimate, please call.
' Sincerely,
' Richard A. Rutherford, P.E. & L.S.
RAR/meh
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James H. Stewart and Associates, Inc.
eac=oulot ex,�cea 103 S. Meldrum Street • P.O. Box 429 • Ft. Collins, CO 80522
970/482-9331 • Fax 970/482-9382
STEWART&ALSSOCIATES 103 S482-9. MELDRUM, FOR
482-T COLLINS9382 , CO 80521
PH. 331 FAX
Consulting Engineers and Surveyors
By: )E A k-1 Date: -r-Au. I( e, Z lient: e Tp AP_ A!! t) ZL- M n -ro fe .3 -T,4, Sheet No. If 6 of
Project: E rD G eke e_ou- AA v-roRr -.1-n-r P—::- F7,4 Xjj-lcm F. D. R
Subject: 5-rQ )e A4 _DA1_ A I A) A G 45 (A) A -r 4s7p— Q c/ A t- / -r X (A Lr- u L_,ol- -rloAjs-
DRAINAGE CRITERIA MANUAL (V. 3)
Cis)
STORMWATER QUALITY MANAGEMENT
0
0
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9-1-1992
UDFCD
O.e
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C
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xten
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Basin
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7
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-Hour
n Pon
Drain
s (W(t)
me
0 10 20 30 40 50 60 70 80 90 100
Percent Impervious Area in Tributary Watershed
Source: Urbanos, Guo, Tucker (1989) (3
zo
Note: Watershed inches of runoff shall apFly. to the
entire watershed tributary to the r Facility.
FIGURE 5-1. WATER QUALITY CAPTURE VOLUME (WQCV)
DRAINAGE CRITERIA MANUAL (V. 3)
(18)
STRUCTURAL E,MPs
10
6.
4.
2.
1.1
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9
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MEIN
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p Required Area per Raw (in.2 )
Source: 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
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